JP2510156Y2 - Rotary tool with depth adjuster - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a depth adjustment used to adjust the screwing depth of an electric screwdriver or the depth of a hole to be drilled by an electric drill. A rotary tool equipped with a device.

[Conventional technology]

Conventionally, as rotary tools equipped with this type of depth adjusting device, those shown in Japanese Utility Model Publication No. 63-86975 and Japanese Patent Publication No. 54-34960 have been proposed. Depth adjustment device 20 shown in these
As shown in FIG. 7, a cylindrical shape that surrounds the bit 1 is attached to the cylindrical portion 3 provided at the tip of the rotary tool body 2 that projects the bit 1 such as a driver bit or a drill bit. It consists of the adjusting sleeve 21. Adjusting sleeve
The inner peripheral surface of the female threaded portion 21a is attached to the tubular portion 3 by being screwed to the male threaded portion 3a formed on the outer circumferential surface of the tubular portion 3. The bit 1 is attached to the drive shaft 4 protruding from the tip of the rotary tool body 2, and the tip of the bit 1 faces the opening of the tip of the adjusting sleeve 21.

When the adjusting sleeve 21 screwed to the tube portion 3 is rotated, the adjusting sleeve 21 moves in the axial direction of the drive shaft 4, and the length of the bit 1 protruding from the tip opening of the adjusting sleeve 21 is adjusted. In this way, the length of the bit 1 protruding from the opening of the tip end of the adjusting sleeve 21 is adjusted, and as shown in FIG.
By adjusting the distance d between the front end surface of the work surface W and the work surface W, the tightening depth of the screw S and the depth of perforation can be adjusted.

In the rotary tool having the depth adjusting device 20 as described above, since the bit 1 is surrounded by the adjusting sleeve 21 and a large space cannot be taken around the tip of the drive shaft 4, the bit is not provided. The structure for attaching 1 to the drive shaft 4 should be space-saving. For example, as shown in FIG. 7, there is often adopted a structure in which a mounting hole 4a is formed at the tip of the drive shaft 4 along the axis thereof, and the bit 1 is inserted through the mounting hole 4a for mounting. The mounting hole 4a is formed in a hexagonal shape in accordance with the shape of the bit 1 having a hexagonal cross section.

Further, the chuck 5 is provided at the tip of the drive shaft 4 because the bit 1 will easily fall out from the mounting hole 4a by simply inserting the bit 1 into the mounting hole 4a. Chuck 5
Is composed of an operating cylinder 6, an engaging member 10, and an elastic body 7. The operation cylinder 6 inserted through the drive shaft 4 is slidably provided on the outer peripheral surface of the drive shaft 4. The operating cylinder 6 has annular ribs 6a and 6b formed on the inner surfaces of the tip end portion and the intermediate portion thereof. An elastic body 7 made of a coil spring is inserted into the outer periphery of the drive shaft 4 to form a rib 6b at an intermediate portion of the operating cylinder and the drive shaft 4
It is provided between a ring-shaped spring retainer 8 fixed to the outer peripheral surface of the operating cylinder 6 and urges the operating cylinder 6 forward along the drive shaft 4. The operating cylinder 6 urged by the elastic body 7 has a retaining ring 9 in which a rib 6a at its tip is fixed to the tip of the drive shaft 4.
And is held at a predetermined position without coming off from the drive shaft 4. The drive shaft 4 has a hole 4b formed on its outer peripheral surface so as to penetrate the mounting hole 4a. The hole 4b is formed at a position corresponding to the rib 6b in the middle portion of the operation tube 6 which is biased to a predetermined position. An engagement means 10 made of a steel ball is arranged in the hole 4b. The hole 4b has an opening formed on the side of the mounting hole 4a smaller than the diameter of the engaging means 10, and the engaging means 10 does not fall from the hole 4b to the mounting hole 4a, and one of the openings is formed. The part is projected into the mounting hole 4a. The operation cylinder 6 has a recess 6c formed between the rib 6a at the tip and the rib 6b at the middle. Further, the length of the bit 1 and the mounting hole 4a is such that when the bit 1 is completely inserted into the mounting hole 4a, an annular recess 1a formed in the bit 1 is formed in the drive shaft 4. It is formed so as to match the hole 4b. Recess
11 is formed by an arc-shaped groove whose center is recessed. As is clear from FIG. 7, the bit 1 has action portions formed at both ends, and it is possible to use both action portions by changing the inserting direction into the mounting hole 4a. 1a
Is also formed at both ends to accommodate both acting parts.

The operation of the chuck 5 configured as described above will be described below. When the operating cylinder 6 is biased to a predetermined position by the elastic body 7, the engaging means 10 arranged in the hole 4b of the drive shaft 4 is pushed by the rib 6b in the intermediate portion of the operating cylinder 6 to A part is projected into the mounting hole 4a. When the bit 1 is attached, the bit 1 is inserted into the attachment hole 4a in a state where the operation tube 6 is slid backward against the elastic body 7. Then, the engaging means that has been partially projected into the mounting hole 4a until then.
10 is pushed by the bit 1 and exits from the mounting hole 4a,
A part of it penetrates into the recess 6c of the operating cylinder 6 and allows the bit 1 to be inserted. When the operating cylinder 6 is opened after the bit 1 is completely inserted into the mounting hole 4a, the operating cylinder 6 is urged by the elastic body 7 to move to a predetermined position in the front, and protrudes into the recess 1c. The engaging means 10 has a mounting hole by means of an intermediate rib 6b.
Pushed to the 4a side. Engaging means 10 protruding into the mounting hole 4a
Part of which engages with the recess 1a formed in the bit 1, whereby the bit 1 is fixed in the mounting hole 4a.

When the bit 1 is removed, the operating cylinder 6 is slid backward and the bit 1 is pulled out from the mounting hole 4a, and the engaging member 10 engaged with the recess 1a is replaced with the recess 1a formed of an arc-shaped groove. It is pushed outward at the edge and exits into the recess 6c of the operation tube 6. As a result, the fixing of the bit 1 is released, and the bit 1 can be removed.

[Problems to be solved by the device]

In such a rotary tool with a depth adjusting device, since the chuck 5 is included in the adjusting sleeve 21, the bit 1
When operating the chuck 5 in order to attach and detach, it is necessary to remove the depth adjusting device 20 from the rotary tool body one by one. That is, the adjusting sleeve 21 is rotated until the screw connection with the tubular portion 3 is released, and the adjusting sleeve 21 is removed from the tubular portion 3, or the tubular portion 3 itself is detachably attached to the rotary tool body 2. In this case, the chuck 5 cannot be operated until the depth adjusting device 20 is removed together with the tubular portion 3, and there is a problem that it takes time to attach and detach the bit 1.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a depth adjusting device that enables speedy attachment / detachment of a bit without having to remove the depth adjusting device when attaching / detaching the bit. To provide a rotary tool.

[Means for Solving the Problems] In order to solve the above problems, the rotary tool with a depth adjusting device of the present invention is configured such that when the adjusting sleeve is moved to the moving end portion on the bit rear end side, The adjustment sleeve is formed with a pressing portion that abuts on the operation tube and slides the operation tube.

[Action]

According to the above configuration, when the adjusting sleeve is moved to the moving end portion on the bit rear end side, the pushing portion formed on the adjusting sleeve comes into contact with the operating cylinder of the clutch and is urged to a predetermined position to move the bit into the mounting hole. The operation tube that has been fixed is pushed in by the pushing portion and slid against the elastic body. As a result, the chuck releases the fixing of the bit, so that the bit can be attached and detached without removing the depth adjusting device.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

It should be noted that the same members as the conventional ones are given the same reference numerals in the drawings, and the description thereof will be omitted.

The rotary tool main body 2 is formed in a substantially L shape, has a motor 50 built therein, a battery pack 51 accommodating a storage battery is detachably attached to the lower end portion, and a power switch including a trigger switch. 52 are provided. The motor 50 is connected to the drive shaft 4 via a planetary speed reducer 55. Reference numeral 56 in the drawing denotes an impact generator that is connected between the planetary speed reducer 55 and the drive shaft 4 and adds a vibrational shock in the axial direction of the drive shaft 4 to the rotational output of the planetary speed reducer 55. The drive shaft 4 is
The bearing 12 is rotatably held and has a tip portion protruding from the tip portion of the rotary tool body 2.

The depth adjusting device 20 includes an adjusting sleeve 21, a tubular portion 3 that is detachably attached to the tip of the rotary tool body 2, and a compression spring 22. The depth adjusting device 20 is assembled by screwing the adjusting sleeve 21 to the tubular portion 3 in a state where the compression spring 22 is arranged between the adjusting sleeve 21 and the tubular portion 3, and the depth adjusting device 20 itself. However, it is configured as one unit independent from the rotary tool main body 2.

The tubular portion 3 is made of a synthetic resin material, and has a large-diameter mounting tubular portion 31 that is attached to the truncated cone-shaped tip of the rotary tool body 2, and a small-diameter coupling tubular portion 32 that has an external thread 3a formed on its outer circumference.
It consists of The mounting cylinder portion 33 has an inner peripheral surface formed in a shape corresponding to the shape of the tip portion of the rotary tool body 2, and is formed to have a diameter slightly smaller than the outer diameter of the tip portion of the rotary tool body 2. The mounting cylinder portion 31 is formed with an axial slit 31a, and tightening means 34 such as a wing nut is attached to bolts 33 extending on both sides of the slit.

Since the slit 33a is formed in the mounting tubular portion 33 and the tubular portion 3 is made of synthetic resin, the mounting tubular portion 33 has a spring property in the radial direction. For this reason, when the mounting cylinder portion 33 is fitted into the tip portion of the rotary tool body 2, the slit 33a is widened, and the slit 33a is closely attached to and held by the tip portion of the rotary tool body 2. Further, the tightening means 34 is operated to firmly fix the tubular portion 3 to the rotary tool body 2.

When the depth adjusting device 20 is operated to adjust the depth, the adjusting sleeve 21 is rotated to move back and forth in the axial direction to adjust the margin of the bit 1 protruding from the tip of the adjusting sleeve 21. To do. The spring 22 arranged between the adjusting sleeve 21 and the tubular portion 3 presses the adjusting sleeve 21 forward to increase the frictional force between the adjusting sleeve 21 and the screws 3a and 3b of the tubular portion 3, thereby adjusting the adjusting sleeve. The adjustment sleeve 21 is rotationally fixed so that it does not easily rotate due to vibration or the like during work.

The main part of the present invention is a push-in portion 23 formed on the adjusting sleeve 21, which is a cylindrical portion protruding from the peripheral edge of the tip opening of the adjusting sleeve 21 toward the inside of the adjusting sleeve 21. Become. The pushing portion 23 is provided on the operation tube 6 of the chuck 5.
The diameter is substantially the same as the diameter of the operation cylinder 6 and is formed coaxially with the operation cylinder 6.

When the adjusting sleeve 21 is located on the tip side of the bit 1, as shown in FIG.
A space is provided between the bit 1 and the operating cylinder 6 and the bit 1 is fixed to the mounting hole 4a by the chuck 5. When removing the bit 1 from the mounting hole 4a, the adjusting sleeve 21 is rotated in the direction in which the screw is tightened and moved to the rear end side of the bit 1. When the adjusting sleeve 21 is moved to the vicinity of the moving end of the adjusting sleeve 21 where the male screw 3a and the female screw 21a reach the end, the pushing cylinder 23 contacts the operating cylinder 6 of the chuck 5 and further moves the adjusting sleeve 21. As shown in FIG. 4 (b), the push-in cylinder 23 slides the operating cylinder 6 toward the rear end of the bit 1. As a result, the rib 6b in the middle of the operating cylinder 6 is disengaged from the outer periphery of the engaging member 10, the engaging member 10 can be retracted into the recess 6c of the operating cylinder 6, and the fixing of the bit 1 is released. The bit 1 can be removed by grasping and pulling out the tip of the bit 1 protruding from the opening of the adjusting sleeve 21.

In this embodiment, the tubular portion 3 is detachably attached to the tip of the rotary tool body 2, but the tubular portion 3 may be formed integrally with the rotary tool body 2.

Another embodiment of the present invention will be described with reference to FIGS. This embodiment differs from the previous embodiments only in the structure in which the adjusting sleeve 21 of the depth adjusting device 20 'is movable in the axial direction of the drive shaft 4.

A slit 25 that is long in the axial direction of the adjusting sleeve 21 is formed in the adjusting sleeve 21. The slit 25 has a plurality of engaging portions 25a to 25d, 26 integrally formed on both sides thereof.

The pin 27 that is erected on the outer peripheral surface of the cylindrical portion 3 is provided with an adjusting sleeve.
It is arranged in 21 slits 25. The pin 27 is movable in the slit 25, and the engaging portions 25a to 25 of the slit 25 are
It can be engaged with d and 26. The pin 27 passes through the slit 25 in a state where the adjustment sleeve 21 is fitted over the tubular portion 3 and is passed through the slit 25.
It is fixed to the cylindrical portion 3 by being press-fitted into the recess formed on the outer peripheral surface of the. The adjusting sleeve 21 is engaged with the tubular portion 3 by the slit 25 and the pin 27.

When adjusting the depth by operating the depth adjusting device 20 ', the pin 27 is positioned in the slit 25 and the adjusting sleeve
21 is moved axially along the slit 25, and bit 1
Adjusting the margin from the tip of the adjusting sleeve 21. Bit 1
The stock removal amount can be adjusted in four stages by the engaging portions 25a to 25d. When the adjustment of the margin of the bit 1 is completed, the pin 27 is aligned with the engaging portions 25a to 25d, and the adjusting sleeve 21 is slightly rotated to engage with the engaging portion. Engage the pin 27 with the engaging parts 25a to 2
When engaged with 5d, the spring 22 arranged between the adjusting sleeve 21 and the tubular portion 3 presses the adjusting sleeve 21 forward,
An increase in the frictional force between the pin 27 and the engaging portions 25a to 25d prevents the adjustment sleeve 21 from moving in the axial direction. When the pin 27 is engaged with the engaging portions 25a to 25d, as shown in FIG. 6 (a), there is a space between the pushing portion 23 and the operation tube 6 of the chuck 5, Bit 1 is chuck 5
It is fixed in the mounting hole 4a.

Adjusting sleeve when removing bit 1 from mounting hole 4a
21 is moved to the moving end portion on the rear end side of the bit 1, and the pin 27 is engaged with the engaging portion 26. While the pin 27 moves from the position of the engaging portion 25d to the position of 26 in the slit 25, the push-in cylinder 23
However, when the pin 27 is brought into contact with the operating cylinder 6 of the chuck 5 and the pin 27 is further engaged with the engaging portion 26, the pushing cylinder 23 moves the operating cylinder 6 to the rear end of the bit 1 as shown in FIG. 6 (b). Slide to the side. As a result, the chuck 5 releases the fixing of the bit 1, so that the bit 1 can be removed.

[Effect of device]

Since the rotary tool with the depth adjusting device of the present invention is configured as described above, when the adjusting sleeve is moved to the moving end portion on the rear end side of the bit, the pushing portion formed on the adjusting sleeve pushes the operating tube of the clutch. Since the chuck releases the fixation of the bit by sliding against the elastic body, it is possible to speedily attach and detach the bit without removing the depth adjusting device.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a side view of a state in which a depth adjusting device is removed from a rotary tool body, and FIG. 3 is an exploded perspective view of the depth adjusting device, FIGS. 4 (a) and 4 (b) are cross-sectional views of a main part thereof, FIGS. 5 (a) and 5 (b) are plan views of a main part of another embodiment of the present invention, and FIG. ) And (b) are cross-sectional views of the main part thereof, FIG. 7 is a cross-sectional view of the main part of the conventional example, and FIG. 8 is a broken cross-sectional view showing the usage thereof. 1 ... Bit, 1a ... Recess, 2 ... Rotating tool body, 4 ...
… Drive shaft, 4a …… Mounting hole, 4b …… Hole, 5 …… Chuck,
6 ... Operation tube, 7 ... Elastic body, 20, 20 '... Depth adjusting device, 21 ... Adjusting sleeve, 23 ... Pushing section.

Claims (1)

(57) [Scope of utility model registration request] 1. A mounting hole is formed by inserting a bit into a tip of a drive shaft which is rotationally driven, and the mounting hole is arranged in a hole formed on an outer peripheral surface of the drive shaft, and a part thereof is mounted from the hole. Engaging means that projects into the hole and engages with the recess of the bit inserted into the mounting hole, an operating cylinder that is slidable on the outer peripheral surface of the drive shaft, and urges the operating cylinder to a predetermined position. When the operating cylinder is in a predetermined position, the engaging means is projected and fixed in the mounting hole to fix the bit in the mounting hole, and when the operating cylinder is slid against the elastic body, The chuck has a chuck that allows the engaging means to be retracted from the mounting hole to release the fixing of the bit, and is attached to the tip of the rotary tool body to surround the bit inserted into the mounting hole and Depth adjustment device with a depth adjustment device consisting of an axially movable tubular adjustment sleeve In the rotary tool with an adjusting device, when the adjusting sleeve is moved to the moving end portion on the rear end side of the bit, the pressing sleeve that slides the operating cylinder of the chuck against the elastic body is formed in the adjusting sleeve. Rotary tool with a depth adjustment device.