JP2024127742A - Driving tools - Google Patents

Abstract

[Problem] A driving tool capable of preventing the falling of the driving tools remaining inside the magazine when the driving tools are loaded into the magazine is required. [Solution] The driving tool 1 has a tool body 10 with a driving passage 3, a magazine 30 attached to the tool body 10, and a pusher 31 for urging the driving tools 40 inside the magazine 30 toward the driving passage 3. The driving tool 1 has a driver 15 for striking the driving tools 40 supplied to the driving passage 3, an anti-empty striking mechanism 32 for restricting the driving operation of the driver 15 when the number of driving tools 40 inside the magazine 30 is less than a predetermined number, and a resistance applying member 35 for applying resistance to the driving tools 40 remaining inside the magazine 30 when the anti-empty striking mechanism 32 is activated, thereby maintaining the position of the driving tools 40. The resistance applying member 35 is provided at a position corresponding to the shortest available driving tool 40. [Selected Figure] Fig. 5

Description

This disclosure relates to a driving tool for driving nails, staples, and other fasteners into wood and other materials.

Patent Document 1 discloses an air-powered driving tool that uses the gas pressure of supplied compressed air as thrust to eject a driving tool. A driver that strikes the driving tool is connected to a piston that is movable within a cylinder. Compressed air is supplied to the upper chamber of the piston. The gas pressure of the compressed air is used to move the driver downward together with the piston. The driving tool struck by the driver is ejected from the ejection port and driven into the material to be driven. Patent Document 2 discloses a driving tool that converts the rotational drive of an electric motor into linear motion of a driver, and the driver ejects the driving tool.

The driving tool is provided with a magazine that contains multiple driving tools. The driving tools are sequentially supplied from the magazine to the driving passage along which the driver moves with each driving operation. If the number of driving tools remaining in the magazine is less than a predetermined number, for example, if there are none, no driving tools are supplied to the driving passage. If the driver continues to move down the driving passage in this state, the driver will strike the material being driven directly, resulting in a blank strike, damaging the material. In addition, the piston collides with the cushion that suppresses the momentum of the piston moving downward, at maximum load. This shortens the life of the cushion. As described in Patent Documents 1 and 2, a driving tool equipped with a blank strike prevention mechanism that prevents the driver from blank strikes when the number of driving tools in the magazine is less than a predetermined number has been devised.

When the blank drive prevention mechanism is activated, a certain number of nail drivers remain in the magazine. This allows the last nail driver available to be driven to continue to receive pressure from the remaining drivers in the magazine toward the nail driving passage. This stabilizes the position of the nail drivers loaded in the nail driving passage, preventing nail jamming.

The next driving tool is loaded into the magazine while there are still driving tools remaining in the magazine. In this case, the remaining driving tools are connected, for example, in the thickness direction. It is preferable that the number of remaining tools is small when the blank driving prevention mechanism is activated, in order to make effective use of the storage space of the magazine. However, a small number of driving tools that are connected to each other have a small total thickness. For this reason, for example, if you try to load the next driving tool with the opening of the magazine facing upwards, the driving tools remaining in the magazine may fall over inside the magazine. This reduces the ease of operation when loading driving tools.

Patent No. 4181488 Patent No. 5548100

Therefore, there is a need for a driving tool that can prevent driving tools remaining inside the magazine from falling over when the driving tools are loaded into the magazine.

According to one feature of the present disclosure, the driving tool has a tool body with a driving passage. The driving tool has a magazine attached to the tool body. The driving tool has a pusher that urges the driving tools inside the magazine toward the driving passage. The driving tool has a driver that strikes the driving tools supplied to the driving passage. The driving tool has an empty-strike prevention mechanism that restricts the driving operation of the driver when the number of driving tools inside the magazine is less than a predetermined number. The driving tool has a resistance applying member that applies resistance to the driving tools remaining inside the magazine when the empty-strike prevention mechanism is activated, thereby maintaining the position of the driving tools. The resistance applying member is provided at a location corresponding to the shortest available driving tool.

Therefore, when the blank driving prevention mechanism operates, a specified number of driving tools remain inside the magazine. When the magazine is opened to load the next driving tool, the pushing force of the pusher that urges the remaining driving tools toward the driving passage is released. Even in this case, the orientation of the driving tools remaining in the magazine can be maintained by the resistance applying member, so that the falling of the driving tools remaining inside the magazine can be prevented when loading driving tools into the magazine. Moreover, by preventing the falling of the shortest available driving tool, it is also possible to prevent the falling of available driving tools of various lengths.

FIG. 2 is a right side view of the driving tool according to the first embodiment of the present disclosure. FIG. FIG. 2 is a vertical sectional view of the driving tool with the driver positioned at the standby position. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, showing a state in which the blank-strike prevention mechanism is turned on. FIG. 2 is a perspective view of a driver, a lift mechanism, and a magazine. FIG. 13 is a left view of the blank strike prevention mechanism and contact arm. FIG. 13 is a perspective view showing a state in which driving tools are loaded into the magazine. FIG. FIG. 11 is a perspective view of a resistance applying member and a driving tool of a driving tool according to a second embodiment. FIG. 11 is a front view of a resistance applying member and a magazine of a driving tool according to a third embodiment. FIG. FIG. FIG.

According to another feature of the present disclosure, the resistance applying member has an elastic member that biases the driving tool with an elastic force. Therefore, by elastically holding the driving tool with the elastic member, it is possible to prevent the posture of the driving tool remaining inside the magazine from changing. Therefore, the remaining driving tool can be held inside the magazine in a stable posture.

According to another feature of the present disclosure, the elastic member is made of rubber. Therefore, the elastic member can be made of rubber, which has a wide range of shapes and elasticity options. Therefore, the elastic member can be made with a shape and elasticity suitable for maintaining the position of the driving tool.

According to another feature of the present disclosure, the resistance applying member has an abutment portion that abuts against the driving tool. The abutment portion includes a loading side curved surface in the loading direction of the driving tool into the magazine. Therefore, by providing the abutment portion with a loading side curved surface, it is possible to reduce the resistance that the resistance applying member applies to the driving tool in the direction in which the driving tool is loaded into the magazine. This allows the driving tool to be loaded smoothly into the interior of the magazine.

According to another feature of the present disclosure, the contact portion includes a curved surface on the feed side in the biasing direction of the pusher. Therefore, by providing the curved surface on the feed side in the contact portion, the resistance applied by the resistance applying member to the driving tool in the biasing direction of the pusher can be reduced. Therefore, the pusher can smoothly bias the driving tool toward the driving passage.

According to another feature of the present disclosure, the contact portion includes a curved surface on the removal side in the direction in which the driving tool is removed from the magazine. Therefore, by providing a curved surface on the removal side on the contact portion, it is possible to reduce the resistance that the resistance applying member applies to the driving tool in the direction in which the driving tool is removed from the magazine. Therefore, for example, if it is desired to remove a remaining driving tool from the magazine, it can be easily removed.

According to another feature of the present disclosure, the resistance applying member has an abutment portion that abuts against the driving tool. The abutment portion includes a flat abutment surface that abuts against the side surface of the driving tool. Therefore, by the flat abutment surface abutting against the side surface of the driving tool, it is possible to prevent the abutment portion from entering between the parallel driving tools. In addition, it is possible to smooth the feeding operation of the driving tools by the pusher.

According to another feature of the present disclosure, the magazine has an opening through which the driving tools are loaded from downstream to upstream in the striking direction of the driving tools. Therefore, the user loads the driving tools into the magazine in a position where the opening generally faces upward. Therefore, the driving tools remaining in the magazine are oriented with their bases facing the ground (downward) and their legs facing the ceiling (upward). The resistance-applying member applies resistance to the driving tools in this position, thereby maintaining the position of the driving tools remaining in the magazine. This improves the workability of loading driving tools into the magazine.

According to another feature of the present disclosure, the blank-strike prevention mechanism has a detection member that is biased toward the pusher and that disengages from the pusher when the number of driving tools in the magazine is below a predetermined number. The resistance member biases the driving tool in a direction parallel to the biasing direction of the detection member. Therefore, the biasing force acting on the driving tool or pusher from the detection member and the biasing force acting on the driving tool from the resistance member are applied from the same direction. This makes it possible to prevent twisting when the driving tool and pusher are sent toward the driving passage.

According to another feature of the present disclosure, the blank strike prevention mechanism has a detection member that is biased toward the pusher and disengages from the pusher when the number of driving tools in the magazine is below a predetermined number. The detection member and the resistance applying member are provided on the same side in the magazine. Therefore, the detection member and the resistance applying member are located on the same side relative to the pusher and the driving tools, respectively. This allows the detection member and the resistance applying member to be arranged compactly within the magazine.

According to another feature of the present disclosure, the resistance applying member has a holding portion that is held in the magazine, and an abutment portion that is integral with the holding portion, protrudes from the holding portion, and abuts against the driving tool. Therefore, the resistance applying member can be provided with a simple structure in which the holding portion and the abutment portion are integrated.

According to another feature of the present disclosure, the resistance applying member has a holding portion that is held by the magazine. The resistance applying member has a flexible portion that extends from the holding portion and is elastically deformable. The resistance applying member has an abutment portion that protrudes from the flexible portion and abuts against the driving tool. The magazine has a support portion that abuts the tip of the flexible portion and supports the flexible portion in a deflected state. Therefore, the abutment portion is constantly biased in the direction opposite to the direction in which the flexible portion is deflected. Moreover, the flexible portion can be retracted in a direction away from the driving tool by bending. Therefore, the abutment portion can be constantly biased with a pressing load that does not cause the driving tool to fall in the magazine and allows it to be smoothly sent to the driving passage. In addition, the flexible portion is prevented from protruding toward the driving tool by the support portion. Therefore, the driving tool can be smoothly fed by the pusher.

According to another feature of the present disclosure, the stapler is a stapler having a base that is struck by a driver and a pair of legs that extend substantially parallel from both ends of the base. Therefore, a stapler having a long width with a pair of legs aligned can be held in a stable position inside the magazine by the resistance applying member.

Next, one embodiment of the present disclosure will be described with reference to Figures 1 to 10. As an example of a driving tool 1, a gas spring type driving tool that uses gas pressure in a pressure accumulator as the thrust for driving a driving tool is shown. In the following description, the driving direction of the driving tool is the downward direction, and the opposite driving direction is the upward direction. A user of the driving tool 1 is generally located on the left side of the driving tool 1 in Figure 1. The side in front of the user is the rear direction, and the back side opposite the front side is the forward direction. The left and right directions are based on the user.

As shown in Figures 1 and 3, the driving tool 1 has a tool body 10. The tool body 10 has a configuration in which a cylinder 12 is housed in a roughly cylindrical body housing 11. A piston 14 is housed in the cylinder 12 so that it can reciprocate up and down. The upper part of the cylinder 12 located above the piston 14 is connected to a pressure accumulator chamber 13. A compressed gas, such as air, is sealed in the pressure accumulator chamber 13. The gas pressure in the pressure accumulator chamber 13 acts as a thrust that urges the upper surface of the piston 14 downward.

As shown in FIG. 3, a driving nose portion 2 having a driving passage 3 is provided at the bottom of the tool body 10. The driving passage 3 extends vertically along a first end face 10a, which corresponds to the front face of the tool body 10. The driving passage 3 is connected to the bottom of the cylinder 12. The driving nose portion 2 is coupled to a magazine 30 in which driving tools 40 are loaded. The magazine 30 can accommodate multiple driving tools 40 extending vertically and aligned in the front-rear direction. The multiple driving tools 40 are bonded to each other while aligned in the front-rear direction. The driving tools 40 are supplied one by one from the magazine 30 forward toward the driving passage 3.

As shown in Figures 1 and 7, the driving nose portion 2 is provided with a contact arm 4 that can slide up and down. The contact arm 4 is biased toward the downward OFF position C1. When the contact arm 4 comes into contact with the workpiece W to be driven, it moves against the biasing force to the upward ON position C2.

As shown in Figures 1 and 3, a grip 5 that is held by the user is provided at the rear of the tool body 10. A trigger 6 that is operated by the user by pulling it with the fingertips is provided on the underside of the front of the grip 5. A trigger switch 6a that switches from an OFF state to an ON state in response to pulling the trigger 6 is provided inside the grip 5. Pulling the trigger 6 becomes effective when the contact arm 4 is pressed against the material to be driven and moves to the ON position C2 (see Figure 7).

As shown in FIG. 3, a battery attachment section 7 extending in the vertical direction is provided on the rear surface of the grip 5. A battery pack 8 can be removably attached to the battery attachment section 7. The battery pack 8 can be removed from the battery attachment section 7 and repeatedly charged and used with a separately prepared charger. The battery pack 8 can be used as a power source for other power tools. The battery pack 8 operates as a power source that supplies power to the electric motor 20, which will be described later, etc.

As shown in Figures 1 and 3, the main housing 11 is provided with a substantially cylindrical drive case 11a extending in the front-rear direction above the magazine 30, and a connecting portion 11b that vertically connects the drive case 11a and the battery attachment portion 7. The grip 5, the battery attachment portion 7, the connecting portion 11b, and the drive case 11a cooperate to form a loop shape. The connecting portion 11b is provided with a controller 9 housed in a shallow rectangular box-shaped case. The controller 9 is housed in the connecting portion 11b in a position that extends generally in the vertical direction. The controller 9 mainly controls the drive of the electric motor 20.

As shown in FIG. 3, a driver 15 that is long vertically is connected to the lower surface of the piston 14. The driver 15 has a main body 15a connected to the piston 14 and a striking part 15c connected to the lower part of the main body 15a. The striking part 15c extends vertically behind the main body 15a and parallel to the main body 15a. That is, the driver 15 is provided with a two-stage structure consisting of the main body 15a and the striking part 15c. The lower part of the striking part 15c enters the driving passage 3. The driver 15 moves downward due to the gas pressure of the pressure accumulator chamber 13 acting on the upper surface of the piston 14. The tip 15d located at the lower end of the striking part 15c strikes one driving tool 40 supplied to the driving passage 3 when it moves to the driving position. The struck driving tool 40 is ejected from the ejection port 3a that opens at the lower end of the driving passage 3. The ejected driving tool 40 is driven into the material W to be driven. A cushion 16 is placed at the bottom of the cylinder 12 to absorb the impact of the piston 14 at its bottom dead center.

As shown in FIG. 6, the right side of the body 15a of the driver 15 is provided with multiple rack teeth (engaged parts) 15b that protrude to the right. In this embodiment, six rack teeth 15b are arranged in a line in the longitudinal direction (up and down direction) of the body 15a. Each rack tooth 15b is provided in a roughly triangular shape with its bottom facing the driving direction (downward). The bottom of the rack tooth 15b engages with an engagement part 24 of the lift mechanism 22, which will be described later.

As shown in Figures 1 and 3, the drive unit case 11a houses an electric motor 20 as a drive source. The electric motor 20 is housed in a position in which the motor axis extends in the front-rear direction. The electric motor 20 is powered by the power of the battery pack 8 and is started by pulling the trigger 6. A planetary reduction mechanism 21 is provided in front of the electric motor 20. The planetary reduction mechanism 21 uses a three-row planetary gear train. A lift mechanism 22 that lifts the driver 15 is provided in front of the planetary reduction mechanism 21. The electric motor 20, the planetary reduction mechanism 21, and the lift mechanism 22 are arranged side by side on the motor axis. The rotational drive of the electric motor 20 is reduced in speed by the planetary reduction mechanism 21 and transmitted to the lift mechanism 22.

1 and 6, the lift mechanism 22 is provided on the right side of the driving nose 2. The lift mechanism 22 has a wheel 23 that can rotate around an axis extending in the front-rear direction. The wheel 23 can rotate in a counterclockwise direction when viewed from the front, and clockwise rotation is restricted. A plurality of engagement parts 24 are attached along the outer periphery of the wheel 23. In this embodiment, for example, six engagement parts 24 are provided. A cylindrical shaft member (pin) extending in the front-rear direction is used for the engagement parts 24. The left part of the wheel 23 enters the driving passage 3 through a window part provided on the right part of the driving passage 3. Each engagement part 24 of the wheel 23 engages with the bottom of the rack teeth 15b of the driver 15 in the driving passage 3. With at least one of the engagement parts 24 engaged with the bottom of the rack teeth 15b, the wheel 23 rotates in the counterclockwise direction. This causes the driver 15 and the piston 14 to return upward. The lift mechanism 22 returns the piston 14 upward, increasing the gas pressure in the pressure accumulator chamber 13 (see Figure 3).

2, 4, and 7, the contact arm 4 is provided as a plate-like member extending generally in the vertical direction. A tip 4a is provided at the lower end of the contact arm 4, which abuts against the workpiece W to be driven. The contact arm 4 has an engaged portion 4b that engages with a stopper 33 (described later) on the left side of the magazine 30. The engaged portion 4b opens toward the rear and right and is provided in a U-shaped groove shape when viewed from the left and right direction. The stopper 33 engages with the underside of the engaged portion 4b (the front side of the figure), which is not visible in the figure. The contact arm 4 is connected to an adjustment dial 4c above the engaged portion 4b. The vertical protrusion amount of the tip 4a of the contact arm 4 can be adjusted by rotating the adjustment dial 4c.

As shown in FIG. 7, the contact arm 4 has a switch abutment 4e that extends in the front-rear direction above the adjustment dial 4c. The contact arm 4 is biased downward by a compression spring 4d provided above the switch abutment 4e. A switch 4g that can be pressed is provided above the tip of the switch abutment 4e. A leaf spring 4f is provided between the switch abutment 4e and the switch 4g. When the tip 4a of the contact arm 4 is pressed against the workpiece W, the contact arm 4 moves from the OFF position C1 to the ON position C2 against the biasing force of the compression spring 4d. The switch abutment 4e also moves from the OFF position C1 to the ON position C2 and presses the switch 4g via the leaf spring 4f. When the switch 4g is pressed and in the ON state, the pulling operation of the trigger 6 (see FIG. 2) is effective. When the switch abutment 4e is in the OFF position C1 and the switch 4g is not pressed and in the OFF state, the pulling operation of the trigger 6 is not effective.

As shown in Figures 1, 3, and 4, the magazine 30 is provided in a generally rectangular box shape extending rearward from the driving nose portion 2. The magazine 30 has a magazine body 30a capable of storing multiple driving tools 40, and a cover 30b that covers the bottom of the magazine body 30a. A supply port 30c that opens toward the driving passage 3 in the front and communicates with the driving passage 3 is provided in the front of the magazine 30. The magazine 30 is provided with a driving tool storage section 30d that is groove-shaped and extends linearly rearward from the supply port 30c. Inside the driving tool storage section 30d, multiple driving tools 40 and a pusher 31 that urges the driving tools 40 forward toward the driving passage 3 are stored.

As shown in Figures 6 and 9, the driving tool 40 is a U-shaped staple. The driving tool 40 has a rod-shaped base 40a extending in the left-right direction and a pair of legs 40b extending from both ends of the base 40a in a direction approximately perpendicular to the base 40a. The driving tool 40 is stored in the magazine 30 with the base 40a positioned at the top and the pair of legs 40b extending downward.

As shown in FIG. 8, an opening 30e is provided on the underside of the magazine body 30a, extending linearly in the front-rear direction. Side walls 30f are provided on both the left and right sides of the opening 30e, extending flatly in the front-rear and up-down directions. The back side (upper side) of the opening 30e is connected to the driving tool storage section 30d. When loading the driving tool 40 into the magazine body 30a, the loading operation is performed with the lower side of the driving tool 40 facing the ceiling (upward) and the opening 30e facing the ceiling. The driving tool 40 is loaded from the ceiling to the floor through the opening 30e, with the base 40a (see FIG. 9) facing the floor (upper side of the driving tool 40) and the legs 40b facing the ceiling (lower side of the driving tool 40).

As shown in Figures 3 and 4, the pusher 31 has a pair of left and right flat plates extending in the up-down and front-rear directions. When viewed from the front-rear direction, the pusher 31 has a U-shape that is substantially the same as the driving tool 40. The pusher 31 is biased forward in the driving tool storage section 30d by a compression spring 31d provided at the rear. The front surface 31a of the pusher 31 biases the driving tool 40 stored in the front toward the driving passage 3.

As shown in Figures 4 and 5, the driving tool 1 is provided with an anti-empty strike mechanism 32. The anti-empty strike mechanism 32 operates when there are a predetermined number or less of driving tools 40 remaining inside the magazine 30, and restricts the winding up operation of the driver 15 by the lift mechanism 22. The anti-empty strike mechanism 32 of the present disclosure operates when there are three or fewer driving tools 40 remaining inside the magazine 30. The anti-empty strike mechanism 32 is provided with a stopper (detection member) 33 that restricts the upward movement of the contact arm 4. The stopper 33 is provided to the left of the driving tool storage section 30d of the magazine 30.

As shown in Figs. 4 and 5, the stopper 33 extends in a generally straight line in the front-rear direction. The stopper 33 can rotate left and right around the axis of the rotation shaft 33a extending in the up-down direction. The rotation shaft 33a is provided slightly behind the center of the stopper 33 in the front-rear direction. The front end of the stopper 33 is provided with an engagement portion 33c that can engage with the engaged portion 4b of the contact arm 4 located in the OFF position C1. When the engagement portion 33c engages with the engaged portion 4b, the contact arm 4 is restricted from moving upward from the OFF position C1 to the ON position C2 (see Fig. 7). The stopper 33 has an abutment portion 33b that protrudes to the right behind the rotation shaft 33a. The abutment portion 33b is provided in a semicircular shape when viewed from the up-down direction. The abutment portion 33b can enter the driving tool accommodating portion 30d from the left side of the driving tool accommodating portion 30d.

As shown in Figures 4 and 5, a compression spring 34 is provided behind the rotating shaft 33a and to the left of the abutment portion 33b. The compression spring 34 urges the stopper 33 to rotate clockwise when viewed from below. The abutment portion 33b of the stopper 33 is urged rightward by the compression spring 34 so as to approach the pusher 31 in the driving tool accommodating portion 30d. The engagement portion 33c of the stopper 33 is urged leftward by the compression spring 34 so as to move away from the pusher 31 in the driving tool accommodating portion 30d and approach the engaged portion 4b of the contact arm 4.

As shown in Figures 4 and 5, the magazine body 30a is provided with a resistance applying member (elastic member) 35 that applies resistance to the driving tool 40 remaining in the driving tool storage section 30d. The resistance applying member 35 is arranged in line with the front of the stopper 33 to the left of the driving tool storage section 30d. The resistance applying member 35 has a holding portion 35a that is held by the magazine body 30a and an abutting portion 35b that protrudes from the holding portion 35a and abuts against the driving tool 40. The resistance applying member 35 is held by the magazine body 30a in an orientation in which the holding portion 35a is located on the left and the abutting portion 35b is located on the right side of the driving tool 40. The abutting portion 35b abuts from the left against the left side surface of the leg portion 40b of the driving tool NT that is located third from the front end of the supply port 30c.

As shown in FIG. 9, the resistance applying member 35 has a holding portion 35a and abutment portion 35b that are integrally formed from the same material. The resistance applying member 35 is made of highly elastic rubber. The driving tool 1 (see FIG. 1) can use multiple types of driving tools 40 with different lengths of leg 40b. The abutment portion 35b is positioned at an upper or lower position where it can abut against the leg 40b of the driving tool NS, which is the shortest among the available driving tools 40.

As shown in FIG. 9, the holding portion 35a is provided in a generally cylindrical shape with the axial direction being the front-to-rear direction. The abutment portion 35b protrudes spherically from the right side surface of the holding portion 35a. The abutment portion 35b abuts against the leg portion 40b of the driving tool NT at the right end of the spherical surface and its periphery. The abutment portion 35b applies resistance to the driving tool NT in the front-to-rear and up-to-down directions. The spherical surface of the abutment portion 35b includes a feed-side curved surface 35c at the rear of the right end, a loading-side curved surface 35d at the lower right end, and an unloading-side curved surface 35e at the upper right end. The feed-side curved surface 35c is located upstream of the abutment portion 35b where the pusher 31 (see FIG. 4) biases the driving tool 40. The loading side curved surface 35d is located on the side of the contact portion 35b where the driving tool 40 is loaded into the driving tool storage portion 30d (see FIG. 8). The removal side curved surface 35e is located on the side of the contact portion 35b where the driving tool 40 is removed from the driving tool storage portion 30d.

As shown in FIG. 4, when four or more driving tools 40 remain in the driving tool storage section 30d, the abutment portion 33b abuts against the left side surface 31b of the pusher 31 or the leg portion 40b of the driving tool 40. This restricts the rotation of the stopper 33, and the engagement portion 33c is not engaged with the engaged portion 4b of the contact arm 4. Therefore, the contact arm 4 can move from the OFF position C1 to the ON position C2 (see FIG. 7).

As shown in FIG. 5, when there are three driving tools 40 remaining in the driving tool storage section 30d, the pusher 31 moves forward of the abutment portion 33b. Therefore, the abutment portion 33b enters the driving tool storage section 30d without abutting the side surface 31b of the pusher 31. As a result, the stopper 33 is biased by the compression spring 34 and rotates. The engagement portion 33c moves leftward and engages with the engaged portion 4b of the contact arm 4. Therefore, the movement of the contact arm 4 from the OFF position C1 to the ON position C2 is restricted, and the switch 4g is not pressed by the switch abutment portion 4e of the contact arm 4 (see FIG. 7). Therefore, the pulling operation of the trigger 6 is not effective, and the electric motor 20 does not start (see FIG. 1). Thus, when there are three or fewer driving tools 40 remaining in the magazine 30, the driver 15 can be prevented from firing blanks.

As shown in FIG. 5, three driving tools 40 remain in the driving tool storage section 30d after the blank driving prevention mechanism 32 operates. The rearmost driving tool NT of the three driving tools 40 is restrained from moving in the front-rear and up-down directions by abutting against the abutment portion 35b of the resistance imparting member 35. For example, when the driving tool 1 is in the position shown in FIG. 8 and new driving tools 40 are loaded, the driving tools 40 remaining in the driving tool storage section 30d stand with the legs 40b extending substantially vertically. If the resistance imparting member 35 were not provided, the driving tools 40 remaining in the driving tool storage section 30d would easily fall in the direction of the arrow shown in FIG. 8. The resistance imparting member 35 applies resistance to the driving tools 40 remaining in the driving tool storage section 30d, thereby preventing the driving tools 40 from falling over when new driving tools 40 are loaded.

Next, a series of steps in the driving operation of the driving tool 1 will be described with reference to Figures 3 to 6. Figures 3 to 6 show the driver 15 in a standby state. In the standby state, the driver 15 is held stopped at a standby position slightly below the top dead center. The driving tool 40 at the forefront, which is located at the supply port 30c, does not enter the driving passage 3 and is stopped at the front end of the supply port 30c.

In the standby state, the contact arm 4 moves upward and the trigger 6 is pulled, starting the electric motor 20. When the electric motor 20 is started, the wheel 23 of the lift mechanism 22 rotates. The engagement portion 24 that engages with the bottom surface of the lowest rack tooth 15b moves the lowest rack tooth 15b upward as the wheel 23 rotates. This moves the driver 15 upward from the standby position to the top dead center. When the driver 15 moves to the top dead center, the driving tool 40 is urged by the pusher 31 and becomes able to enter the driving passage 3. This supplies one driving tool 40 at the front end from the magazine 30 into the driving passage 3.

When the driver 15 reaches the top dead center and is about to be driven in, the engagement portion 24 disengages from the bottom of the lowest rack tooth 15b. This causes the driver 15 to move downwards, urged by the gas pressure in the pressure accumulator chamber 13 that was applied to the piston 14. The striking portion 15c of the driver 15 moves downwards in the driving passage 3 to the driving position, and the tip 15d strikes the base 40a of one of the driving tools 40. As the driver 15 moves downwards, all of the engagement portions 24 retreat from the driving passage 3. This avoids interference between the rack teeth 15b of the driver 15 moving downwards and the engagement portions 24, ensuring a smooth driving operation.

The wheel 23 continues to rotate while the driver 15 is moving downward and even after it has reached bottom dead center. When the driver 15 is at bottom dead center, the wheel 23 rotates to a predetermined rotation angle, and one of the engagement parts 24 engages with the bottom of the uppermost rack tooth 15b. This starts a return operation that moves the driver 15 upward in the direction opposite to the driving direction. When one of the engagement parts 24 engages with the bottom of the lowermost rack tooth 15b, the driver 15 returns to the standby position. For example, by appropriately controlling the time from the start of the start of the electric motor 20, the electric motor 20 is stopped when the piston 14 reaches the standby position. This holds the driver 15 in the standby position. This completes the series of driving operations.

As described above, the driving tool 1 has a tool body 10 with a driving passage 3 as shown in Figures 4 and 5. The driving tool 1 has a magazine 30 attached to the tool body 10. The driving tool 1 has a pusher 31 that urges the driving tool 40 inside the magazine 30 toward the driving passage 3. The driving tool 1 has a driver 15 that strikes the driving tool 40 supplied to the driving passage 3. The driving tool 1 has an empty driving prevention mechanism 32 that restricts the driving operation of the driver 15 when the number of driving tools 40 inside the magazine 30 is less than a predetermined number. The driving tool 1 has a resistance applying member 35 that applies resistance to the driving tool 40 remaining inside the magazine 30 when the empty driving prevention mechanism 32 is activated, thereby maintaining the position of the driving tool 40. The resistance applying member 35 is provided at a location corresponding to the shortest available driving tool NS (see Figure 9).

Therefore, when the blank driving prevention mechanism 32 operates, a predetermined number of driving tools 40 remain inside the magazine 30. When the magazine 30 is opened to load the next driving tool 40, the pressing force of the pusher 31 that urges the remaining driving tools 40 toward the driving passage 3 is released. Even in this case, the resistance member 35 can maintain the posture of the driving tools 40 remaining in the magazine 30, so that the falling of the driving tools 40 remaining inside the magazine 30 can be suppressed when loading the driving tools 40 into the magazine 30. Moreover, by suppressing the falling of the shortest available driving tool NS, it is also possible to suppress the falling of available driving tools 40 of various lengths.

As shown in Figures 4, 5, and 9, the resistance applying member 35 has an elastic member that biases the driving tool 40 with an elastic force. Therefore, by elastically holding the driving tool 40 with the elastic member, it is possible to prevent the posture of the driving tool 40 remaining inside the magazine 30 from changing. Therefore, the remaining driving tool 40 can be held inside the magazine 30 in a stable posture.

As shown in FIG. 9, the resistance imparting member (elastic member) 35 is made of rubber. Therefore, the resistance imparting member 35 can be made of rubber, which has a wide range of shapes and elasticity options. Therefore, the resistance imparting member 35 can be made with a shape and elasticity suitable for maintaining the position of the driving tool 40.

As shown in Figures 4, 5, and 9, the resistance applying member 35 has an abutment portion 35b that abuts against the driving tool 40. The abutment portion 35b includes a loading side curved surface 35d in the loading direction of the driving tool 40 into the magazine 30. Therefore, by providing the loading side curved surface 35d on the abutment portion 35b, it is possible to reduce the resistance that the resistance applying member 35 applies to the driving tool 40 in the direction in which the driving tool 40 is loaded into the magazine 30. Therefore, the driving tool 40 can be loaded smoothly into the inside of the magazine 30.

As shown in FIG. 9, the contact portion 35b includes a feed-side curved surface 35c in the urging direction of the pusher 31. Therefore, by providing the feed-side curved surface 35c on the contact portion 35b, the resistance applied by the resistance applying member 35 to the driving tool 40 in the urging direction of the pusher 31 can be reduced. Therefore, the pusher 31 can smoothly urge the driving tool 40 toward the driving passage 3.

As shown in FIG. 9, the contact portion 35b includes a curved surface 35e on the removal side in the direction in which the driving tool 40 is removed from the magazine 30 (see FIG. 8). Therefore, by providing the curved surface 35e on the removal side on the contact portion 35b, the resistance applied to the driving tool 40 by the resistance applying member 35 in the direction in which the driving tool 40 is removed from the magazine 30 can be reduced. Therefore, for example, if it is desired to remove a remaining driving tool 40 from the magazine 30, it can be easily removed.

As shown in FIG. 8, the magazine 30 has an opening 30e through which the driving tool 40 is loaded from the downstream side to the upstream side of the striking direction of the driving tool 40. Therefore, the user loads the driving tool 40 into the magazine 30 with the opening 30e generally facing upward. Therefore, the driving tool 40 remaining in the magazine 30 is in a position with the base 40a facing the ground (downward) and the legs 40b facing the ceiling (upward). The resistance applying member 35 applies resistance to the driving tool 40 in this position, so that the position of the driving tool 40 remaining in the magazine 30 can be maintained. This improves the workability of loading the driving tool 40 into the magazine 30.

As shown in Figures 4 and 5, the blank driving prevention mechanism 32 has a stopper (detection member) 33 that is biased toward the pusher 31 and disengages from the pusher 31 when the number of driving tools 40 in the magazine 30 is below a predetermined number. The resistance applying member 35 biases the driving tool 40 in a direction parallel to the biasing direction of the stopper 33. Therefore, the biasing force acting on the driving tool 40 or the pusher 31 from the stopper 33 and the biasing force acting on the driving tool 40 from the resistance applying member 35 are applied from the same direction. This makes it possible to prevent twisting when the driving tool 40 and the pusher 31 are sent toward the driving passage 3.

As shown in Figures 4 and 5, the blank strike prevention mechanism 32 has a stopper (detection member) 33 that is biased toward the pusher 31 and disengages from the pusher 31 when the number of driving tools 40 in the magazine 30 is below a predetermined number. The stopper 33 and the resistance applying member 35 are provided on the same left side in the magazine 30. Therefore, the stopper 33 and the resistance applying member 35 are located on the same left side relative to the pusher 31 and the driving tools 40, respectively. Therefore, the stopper 33 and the resistance applying member 35 can be arranged compactly within the magazine 30.

As shown in Figures 4 and 5, the resistance applying member 35 has a holding portion 35a that is held by the magazine 30, and an abutment portion 35b that is integral with the holding portion 35a, protrudes from the holding portion 35a, and abuts against the driving tool 40. Therefore, the resistance applying member 35 can be provided with a simple structure in which the holding portion 35a and the abutment portion 35b are integrated.

As shown in FIG. 6, the driving tool 40 is a staple having a base 40a that is struck by the driver 15 and a pair of legs 40b that extend substantially parallel from both ends of the base 40a. Therefore, a staple having a long width in which the pair of legs 40b are aligned can be held in a stable position inside the magazine 30 by the resistance applying member 35.

Next, a second embodiment of the present disclosure will be described with reference to FIG. 10. The driving tool 50 of the second embodiment has a resistance imparting member (elastic member) 51 instead of the resistance imparting member 35 of the driving tool 1 shown in FIG. 4. In the following explanation, only the parts that differ from the first embodiment will be described in detail.

As shown in FIG. 10, the resistance applying member 51 is arranged next to the stopper 33 to the left of the driving tool storage section 30d (see FIG. 4). The resistance applying member 51 has a holding portion 51a held by the magazine body 30a, and an abutment portion 51b that protrudes from the holding portion 51a and abuts against the driving tool 40. The resistance applying member 51 is held by the magazine body 30a in an orientation in which the holding portion 51a is located on the left and the abutment portion 51b is located on the right side of the driving tool 40. The abutment portion 51b abuts from the left against the left side surface of the leg 40b of the driving tool NT that is located third from the front end of the supply port 30c.

As shown in FIG. 10, the resistance applying member 51 has a holding portion 51a and abutment portion 51b that are integrally formed from the same material. The resistance applying member 51 is formed in a plate shape using a highly elastic metal material. The driving tool 1 (see FIG. 1) can use multiple types of driving tools 40 with different lengths of leg 40b. The abutment portion 51b is positioned at an upper or lower position where it can abut against the leg 40b of the driving tool NS, which is the shortest among the available driving tools 40.

As shown in FIG. 10, the holding portion 51a is provided in a flat plate shape. The abutment portion 51b is provided by cutting out a part of the holding portion 51a and protruding it further to the right in a spherical shape. The abutment portion 51b abuts against the leg portion 40b of the driving tool NT at the right end of the curved surface and its periphery. The abutment portion 51b applies resistance to the driving tool NT in the front-rear and up-down directions. The spherical surface of the abutment portion 51b includes a feed-side curved surface 51c at the rear of the right end, a loading-side curved surface 51d at the lower right end, and an unloading-side curved surface 51e at the upper right end. The feed-side curved surface 51c is located upstream of the abutment portion 51b where the pusher 31 (see FIG. 4) biases the driving tool 40. The loading side curved surface 51d is located on the side of the contact portion 51b where the driving tool 40 is loaded into the driving tool storage portion 30d (see FIG. 8). The removal side curved surface 51e is located on the side of the contact portion 51b where the driving tool 40 is removed from the driving tool storage portion 30d.

As shown in FIG. 10, the holding portion 51a has a rectangular flat base 51f and a pair of legs 51g extending rearward from both the upper and lower ends of the base 51f. The pair of legs 51g can be inserted into grooves (not shown) in the magazine 30 to fix the holding portion 51a to the magazine 30. The holding portion 51a has a bent portion 51h extending rearward from the base 51f and a rectangular flat plate-shaped flat portion 51i extending rearward from the bent portion 51h. The bent portion 51h and the flat portion 51i are provided between the pair of legs 51g in the vertical direction. The abutment portion 51b protruding in the thickness direction of the flat portion 51i is provided in the center of the flat portion 51i. The bent portion 51h is bent toward the protruding direction of the abutment portion 51b. Therefore, the flat portion 51i is located on the side of the driving tool 40 (right side) relative to the base 51f. The bent portion 51h and the flat portion 51i can bend to the left, in the opposite direction to the protruding direction of the abutment portion 51b.

Next, a third embodiment of the present disclosure will be described with reference to Figures 11 to 14. The driving tool 60 of the third embodiment has a resistance-applying member (elastic member) 61 instead of the resistance-applying member 35 of the driving tool 1 shown in Figure 4. The driving tool 60 has a magazine 63, instead of the magazine 30 shown in Figure 1, which has a structure for holding the resistance-applying member 61 so that it can be retracted from the driving tool storage section 30d. In the following description, only the parts that differ from the first embodiment will be described in detail.

As shown in FIG. 11, the magazine 63 has a magazine body 30a, a cover 30b, a supply port 30c, a driving tool storage section 30d, an opening 30e, and a side wall 30f, similar to the magazine 30 (see FIGS. 4 and 8). The magazine 63 has a storage chamber 63a that stores and holds the resistance applying member 61. The storage chamber 63a is provided in the front part of the magazine body 30a close to the supply port 30c and to the right of the driving tool storage section 30d. Therefore, the resistance applying member 61 is provided on the left-right opposite side of the blank driving prevention mechanism 32 provided to the left of the driving tool storage section 30d.

As shown in FIG. 11, the left end of the storage chamber 63a opens into the driving tool storage section 30d. The upper part of the storage chamber 63a is provided with ribs 63b and 63c and a flat surface 63d. The rib 63b forms the upper end of the opening of the storage chamber 63a and protrudes to the right. The flat surface 63d is located to the right of the rib 63b and extends flatly in the up-down and front-to-back directions. The rib 63c protrudes from the lower end of the flat surface 63d to the left of the flat surface 63d. The ribs 63b and 63c and the flat surface 63d cooperate to form a rectangular groove that is long vertically and short horizontally. The base 61b of the resistance-applying member 61, which will be described later, is pressed into this rectangular groove.

As shown in FIG. 11, a rib-shaped support portion 63e is provided at the bottom of the storage chamber 63a. The support portion 63e forms the bottom end of the opening of the storage chamber 63a and extends flatly in the up-down and front-rear directions. In the area between the rib 63c of the storage chamber 63a and the support portion 63e, a space is provided that allows the bending portion 61f of the resistance applying member 61, which will be described later, to bend to the right.

As shown in Figures 11 to 14, the resistance applying member 61 has a holding portion 61a held in a magazine 63, and an abutment portion 62 that protrudes to the left from the holding portion 61a. The abutment portion 62 abuts against the right side surface of the right leg 40b of the driving tool 40. The holding portion 61a has a rectangular flat base portion 61b and a flexible portion 61f that extends leftward and downward from the base portion 61b. The abutment portion 62 protrudes to the left from the vertical middle position of the flexible portion 61f. The base portion 61b, the flexible portion 61f, and the abutment portion 62 are integrally molded from the same material. The material of the resistance applying member 61 is, for example, a synthetic resin.

As shown in Figures 11 to 14, the flexure 61f extends leftward from approximately the center of the base 61b in the vertical direction. The base 61b has a first protruding portion 61c that protrudes upward from the connection portion with the flexure 61f, and a second protruding portion 61d that protrudes downward from the connection portion with the flexure 61f. The first protruding portion 61c and the second protruding portion 61d are provided slightly longer on both the front and rear sides than the flexure 61f. Therefore, when the base 61b is attached to the magazine 63, the flexure 61f has a gap in the front-rear direction with respect to both the front and rear ends of the storage chamber 63a. This gap prevents the flexure 61f from interfering with the inner wall of the magazine 63, for example, when the contact portion 62 is pressed against the side of the leg 40b of the driving tool 40 and bends slightly in the front-rear direction.

As shown in Figures 11 to 14, the left side of the first overhang 61c is provided with two semi-spherical bosses 61e, one at the front and one at the back, which protrude to the left. The first overhang 61c is press-fitted between the rib 63b and the flat surface 63d. By providing the bosses 61e, the first overhang 61c is press-fitted so that it does not slip out from between the rib 63b and the flat surface 63d. The second overhang 61d follows the flat surface 63d and abuts against the upper surface of the rib 63c at its lower end. Thus, the base 61b is held in the groove formed by the ribs 63b, 63c and the flat surface 63d in cooperation with each other.

As shown in Figures 11 to 14, the flexible portion 61f has a bent portion 61i that curves downward from the connection portion with the base portion 61b. The flexible portion 61f extends substantially straight from the tip side (lower) of the bent portion 61i to the location where the abutment portion 62 is provided. In a natural state where it is not subjected to external force, the flexible portion 61f extends downward and slightly tilted to the left away from the base portion 61b. In the natural state, the flexible portion 61f is tilted at an angle with respect to the extension direction of the base portion 61b. When the flexible portion 61f is attached to the magazine 63, it bends to the right and extends straight in the vertical direction so as to be substantially parallel to the base portion 61b. In other words, when the flexible portion 61f is attached to the magazine 63, a biasing force is constantly acting to the left in the amount of elastic deformation from the tilted position in the natural state to a position extending straight in the vertical direction.

12 and 14, the flexible portion 61f has a pair of front and rear legs 61g extending parallel to each other from the connection with the base 61b. The pair of legs 61g are provided at the front and rear ends of the flexible portion 61f, respectively. Therefore, the flexible portion 61f is suppressed from twisting in the front and rear direction. For example, when the driving tool 40 is sent to the forward driving passage 3 (see FIG. 4), the abutting portion 62 that abuts against the driving tool 40 is pushed forward. By providing the pair of legs 61g, the flexible portion 61f is suppressed from twisting against the force that pushes the abutting portion 62 forward. A hollow portion 61h is provided between the pair of legs 61g in the front and rear direction. By providing the hollow portion 61h, the pressing load of the flexible portion 61f is weakened to a degree that prevents the driving tool 40 from falling and does not interfere with the feeding operation to the driving passage 3.

As shown in Figures 11 to 14, a tip bent portion 61j that is curved in an S-shape toward the right is provided at the bottom of the flexure 61f. The flexure 61f has a tip 61k that extends flatly below the tip bent portion 61j. The tip 61k extends approximately parallel to the vertical center of the flexure 61f. The left side of the tip 61k abuts against the right side of the support portion 63e of the magazine 63. This allows the flexure 61f to be attached to the magazine 63 in a position in which it extends straight in the vertical direction. Moreover, the flexure 61f is restricted from moving to the driving tool storage portion 30d to the left of its attached position. The flexure 61f is only allowed to bend to the right of its attached position within the storage chamber 63a.

As shown in Figures 11 to 14, the abutment portion 62 is formed in a hemispherical shape including a flat portion at the left end. At the left end of the abutment portion 62, an abutment plane 62d is provided that extends approximately parallel to the flexure 61f. The abutment plane 62d is approximately circular when viewed from the left. The spherical surface provided around the abutment plane 62d of the abutment portion 62 includes a feed-side curved surface 62a, a loading-side curved surface 62b, and an unloading-side curved surface 62c. The feed-side curved surface 62a is located behind the abutment plane 62d, and is located upstream of the abutment portion 62 where the pusher 31 (see Figure 4) biases the driving tool 40. The loading-side curved surface 62b is located below the abutment plane 62d, which is the side where the driving tool 40 is loaded into the driving tool storage portion 30d. The removal side curved surface 62c is located above the contact plane 62d, on the side where the driving tool 40 is removed from the driving tool storage section 30d.

As shown in Figures 11 and 14, the contact plane 62d of the contact portion 62 comes into face contact with the right side surface of the leg 40b of the driving tool NT. The face contact prevents the contact plane 62d from entering the gap between the driving tools 40 arranged in front and behind. This prevents the contact portion 62 from getting caught on the driving tool 40, allowing the driving tool 40 to be smoothly fed into the driving passage 3 (see Figure 4). The flexible portion 61f can bend to the right so that the contact portion 62 retreats from the driving tool storage portion 30d, as shown by the imaginary line in Figure 11. This also prevents the contact portion 62 from getting caught on the driving tool 40, allowing the driving tool 40 to be fed smoothly.

As described above, the resistance applying member 61 has an abutment portion 62 that abuts against the driving tool 40 as shown in Figs. 11 and 14. The abutment portion 62 includes a contact plane 62d that abuts against the side surface of the driving tool 40. Therefore, the abutment plane 62d abuts against the side surface of the driving tool 40, thereby preventing the abutment portion 62 from entering between the parallel driving tools 40. This allows the pusher 31 (see Fig. 4) to smoothly feed the driving tool 40.

As shown in FIG. 11, the resistance applying member 61 has a holding portion 61a held by the magazine 63. The resistance applying member 61 has a flexible portion 61f that extends from the base portion 61b of the holding portion 61a and is elastically deformable. The resistance applying member 61 has an abutment portion 62 that protrudes from the flexible portion 61f and abuts against the driving tool 40. The magazine 63 has a support portion 63e that abuts against the tip 61k of the flexible portion 61f and supports the flexible portion 61f in a bent state. Therefore, the abutment portion 62 is constantly biased in the direction opposite to the bending direction of the flexible portion 61f. Moreover, the flexible portion 61f can be retracted in a direction away from the driving tool 40 by bending. Therefore, the abutment portion 62 can be constantly biased with a pressing load that does not cause the driving tool 40 to fall in the magazine 63 and is smoothly sent to the driving passage 3 (see FIG. 4). In addition, the support portion 63e prevents the flexible portion 61f from protruding toward the driving tool 40. This allows the pusher 31 (see FIG. 4) to smoothly feed the driving tool 40.

Various modifications can be made to the driving tools 1, 50, and 60 of the embodiments described above. Gas spring type driving tools 1, 50, and 60 have been shown as examples. Alternatively, the present disclosure may be applied to a driving tool called a mechanical spring type, in which the driver is moved in the anti-driving direction by a lift mechanism and the spring force of a mechanical compression spring or the like is increased to move the driver in the driving direction. The shape, size, etc. of the driving tool are not limited to the driving tool 40 shown as an example and may be modified as appropriate.

The driver 15 is not limited to the illustrated example and may be modified as appropriate. For example, the number of rack teeth 15b and the vertical spacing may be modified as appropriate. The lift mechanism 22 is not limited to the illustrated example and may be modified as appropriate. For example, the number of engagement parts 24 and the circumferential spacing may be modified as appropriate. For example, instead of the pin-shaped engagement part 24, a pinion-shaped engagement part having multiple teeth may be used.

The configuration in which the resistance imparting member 35 and the stopper 33 are both arranged to the left of the driving tool accommodating section 30d has been exemplified. Alternatively, the resistance imparting member 35 and the stopper 33 may both be arranged to the right of the driving tool accommodating section 30d. Although this will impair the compactness of the driving tool 1, the resistance imparting member 35 and the stopper 33 may be arranged on opposite sides of the driving tool accommodating section 30d. The driving tool NT against which the abutment portions 35b, 51b of the resistance imparting members 35, 51 abut is not limited to the third from the front as exemplified, but may be the second or earlier, or the fourth or later.

The resistance applying members 35, 51 are exemplified as being made of rubber or metal. Alternatively, the resistance applying members may be spring members or the like made of resin material. Although the holding portion 35a, 51a and the contact portion 35b, 51b of the resistance applying members 35, 51 are exemplified as being integrally made of the same material, they may be made of different materials, for example, only the contact portion 35b, 51b may be made of an elastic material. The contact portion 35b, 51b may be flat and not protrude from the holding portion 35a, 51a. The tip (right end) of the contact portion 35b, 51b may be flat and not curved, but may be flat and follow the side of the leg portion 40b of the driving tool 40.

The resistance applying members 35, 51 that apply resistance to the driving tool 40 using an elastic member are exemplified. Alternatively, for example, magnets may be provided on the left and right sides of the base 40a of the driving tool 40, and the magnetic force of the magnets may be used to attract the base 40a, thereby applying resistance to the driving tool 40.

The flexible portion 61f extending downward from the base 61b is illustrated. Alternatively, the flexible portion 61f may extend upward, backward, or forward from the base 61b. The flexible portion 61f extends from approximately the center of the base 61b in the vertical direction. Alternatively, the flexible portion 61f may extend from the upper end or lower end of the base 61b. The structure for holding the base 61b in the magazine 63 may be changed as appropriate. For example, instead of or in addition to the first protruding portion 61c, a boss 61e may be provided on the second protruding portion 61d. For example, the shape of the rib of the storage chamber 63a may be changed to match the shape of the base 61b. The abutting portions 35b and 51b may be provided with a portion that comes into face contact with the driving tool 40, such as the abutting plane 62d of the abutting portion 62.

1... Driving tool 2... Driving nose portion 3... Driving passage, 3a... Injection port, 3b... First wall surface 4... Contact arm, 4a... Tip, 4b... Engaged portion, 4c... Adjustment dial 4d... Compression spring, 4e... Switch abutment portion, 4f... Leaf spring, 4g... Switch 5... Grip 6... Trigger, 6a... Trigger switch 7... Battery mounting portion 8... Battery pack 9... Controller 10... Tool body, 10a... First end surface 11... Body housing, 11a... Drive unit case, 11b... Connection portion 12... Cylinder 13... Accumulator chamber 14... Piston 1 5...driver, 15a...main body, 15b...rack teeth (engaged part), 15c...striking part 15d...tip 16...cushion 20...electric motor 21...planetary reduction mechanism 22...lift mechanism 23...wheel 24...engagement part 30...magazine, 30a...magazine body, 30b...cover, 30c...supply port 30d...driving tool storage part, 30e...opening, 30f...side wall 31...pusher, 31a...front, 31b...side, 31d...compression spring 32...empty strike prevention mechanism 33...stopper (detection member), 33a...rotating shaft, 33b...contact part, 33c...engagement Joint 34... compression spring 35... resistance applying member (elastic member), 35a... holding portion, 35b... abutment portion 35c... feed-side curved surface, 35d... loading-side curved surface, 35e... removal-side curved surface 40... driving tool, 40a... base, 40b... leg 50... driving tool 51... resistance applying member (elastic member), 51a... holding portion, 51b... abutment portion 51c... feed-side curved surface, 51d... loading-side curved surface, 51e... removal-side curved surface 51f... base, 51g... leg, 51h... bent portion, 51i... flat portion 60... driving tool 61... resistance applying member (elastic member), 61a... holding portion , 61b...base, 61c...first protruding portion 61d...second protruding portion, 61e...boss, 61f...flexible portion, 61g...leg, 61h...lightening portion 61i...bent portion, 61j...tip bent portion, 61k...tip 62...contact portion, 62a...feed-side curved surface, 62b...loading-side curved surface, 62c...removal-side curved surface 62d...contact plane 63...magazine, 63a...storage chamber, 63b, 63c...rib, 63d...plane 63e...support portion NT...driving tool (with which resistance-applying member abuts), NS...(shortest) driving tool W...driven material C1...OFF position, C2...ON position

Claims (13)

A driving tool,
A tool body having a drive passage;
A magazine attached to the tool body;
a pusher that biases the driving tool inside the magazine toward the driving passage;
a driver that strikes the driving tool supplied to the driving passage;
a blank driving prevention mechanism that restricts the driving operation of the driver when the number of the driving tools inside the magazine is equal to or less than a predetermined number;
a resistance applying member that applies resistance to the driving tool remaining inside the magazine when the blank-strike prevention mechanism is activated, thereby maintaining the attitude of the driving tool;
The resistance applying member is provided at a location corresponding to the shortest available driving tool. The driving tool according to claim 1,
The resistance applying member is a driving tool having an elastic member that biases the driving tool with an elastic force. The driving tool according to claim 2,
The elastic member is made of rubber. A driving tool according to any one of claims 1 to 3,
The resistance applying member has a contact portion that contacts the driving tool,
The abutment portion is a driving tool including a loading side curved surface in a loading direction of the driving tool into the magazine. The driving tool according to claim 4,
The abutment portion is a driving tool including a feed-side curved surface in the biasing direction of the pusher. The driving tool according to claim 4 or 5,
The abutment portion is a driving tool including a curved surface on a removal side in a direction in which the driving tool is removed from the magazine. A driving tool according to any one of claims 1 to 6,
The resistance applying member has a contact portion that contacts the driving tool,
The abutment portion includes a flat abutment surface that comes into face-to-face contact with a side surface of the driving tool. A driving tool according to any one of claims 1 to 7,
The magazine is a driving tool having an opening through which the driving tools are loaded from the downstream side to the upstream side in the impact direction of the driving tools. A driving tool according to any one of claims 1 to 8,
the blank-strike prevention mechanism has a detection member that is biased toward the pusher and that is disengaged from the pusher when the number of the driving tools in the magazine is equal to or less than a predetermined number,
The resistance applying member is a driving tool that urges the driving tool in a direction parallel to the urging direction of the detection member. A driving tool according to any one of claims 1 to 9,
the blank-strike prevention mechanism has a detection member that is biased toward the pusher and that is disengaged from the pusher when the number of the driving tools in the magazine is equal to or less than a predetermined number,
A driving tool, wherein the detection member and the resistance applying member are provided on the same side within the magazine. A driving tool according to any one of claims 1 to 10,
The resistance applying member is a driving tool having a holding portion held in the magazine and a contact portion formed integrally with the holding portion, protruding from the holding portion and contacting the driving tool. A driving tool according to any one of claims 1 to 11,
the resistance applying member has a holding portion held by the magazine, a flexible portion extending from the holding portion and capable of elastic deformation, and an abutment portion protruding from the flexible portion and abutting against the driving tool,
The magazine is a driving tool having a support portion against which the tip of the flexible portion abuts and supports the flexible portion in a flexible state. A driving tool according to any one of claims 1 to 12,
The driving tool is a stapler having a base portion that is struck by the driver and a pair of legs that extend generally parallel to each other from both ends of the base portion.

Images