JP2018153876A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool which enables a body part and a holding part of the tool to be stably connected to each other.SOLUTION: A holding part 3 is connected to the rear side of a body part 2 by a first connection part 5 and a second connection part. The first connection part 5 rotatably connects the body part 2 with the holding part 3. The second connection part has: a coil spring 12 provided between the body part 2 and the holding part 3; and a guide rod 13 which maintains a direction of a load applied to the coil spring 12 to an axial direction of the coil spring 12. The guide rod 13 has: a first opening into which a first rotary shaft 10 at the body part 2 side is inserted; and a second opening 13b into which a second rotary shaft 11 at the holding part 3 side is inserted. The second opening 13b has a shape such that the second rotary shaft 11 can slide in a longitudinal direction of the guide rod 13.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electric tool provided with a grip portion for a worker to grip on the rear side of a main body portion.

  2. Description of the Related Art As an electric tool having a grip portion on the rear side of a main body portion, a hammer drill having a striking mechanism and a rotation mechanism for transmitting a rotation output of a motor to a tip tool is known. Hammer drills are used for drilling and cutting concrete, etc., and the main body generates large vibrations and shocks. Therefore, a vibration-proof structure is provided between the main body and the gripping part to reduce the burden on the operator. It has been proposed to do.

  Patent Document 1 is rotatably supported by a work tool main body, a grip main body extending in a direction crossing the long axis direction of the work tool main body, and a rotation shaft provided at a lower end of the rear end of the work main body tool. A hand-held work tool having a lower connection part and an upper connection part connected to the rear end upper part of the work tool main body via a coil spring is disclosed. Both ends of the coil spring are fixed to the work tool main body and the upper connecting portion, respectively.

JP 2010-567 A

  According to the vibration isolating structure disclosed in Patent Document 1, the upper connecting portion rotates with respect to the work tool main body with the rotation shaft as a rotation fulcrum, so both ends are fixed to the work tool main body and the upper connecting portion. A load in the rotational direction is applied to the coil spring. The fact that the coil spring receives a load obliquely with respect to the axial direction makes it difficult to obtain a linear vibration absorbing action due to a change in the spring constant due to the amount of expansion and contraction, and shortens the life of the coil spring.

  This invention is made | formed in view of such a condition, The objective is to provide the electric tool provided with the suitable anti-vibration structure.

  In order to solve the above-described problems, an electric tool according to an aspect of the present invention includes a main body that houses a motor and a motion transmission mechanism that transmits a rotation output of the motor to a tip tool, and a first on the rear side of the main body. And a grip portion connected by the connection portion and the second connection portion. The first connecting part rotatably connects the main body part and the gripping part, and the second connecting part has an elastic body provided between the main body part and the gripping part and a load direction applied to the elastic body. And a guide rod maintained in the axial direction.

  ADVANTAGE OF THE INVENTION According to this invention, the electric tool provided with the suitable vibration-proof structure can be provided.

It is a figure which shows the external appearance structure of the electric tool 1 which concerns on embodiment of this invention. It is a figure which shows an example of the structure of a 2nd connection part. It is a figure which shows an example of a structure of a guide rod. It is a figure which shows an example of a structure of a spring receiving part. It is a figure for demonstrating the effect | action of the vibration proof structure of embodiment. It is a figure for demonstrating the effect | action of the vibration proof structure of embodiment. It is a figure which shows an example of the structure of a 1st connection part.

  FIG. 1 shows an external configuration of a power tool 1 according to an embodiment of the present invention. The electric tool 1 includes a main body 2 and a grip 3 for a worker to grip. The power tool 1 is supplied with electric power from a secondary battery built in a detachable battery pack 4. In the embodiment, a hammer drill in which the grip portion 3 is connected to the rear end side of the main body portion 2 is shown as an example of the electric tool 1, but the electric tool 1 may be another work tool such as a lifting machine. In FIG. 1, the longitudinal direction of the tool is defined with the left side with the tip tool 9 attached as the front side of the tool and the right side with the grip portion 3 as the rear side of the tool.

  The main body 2 includes a housing that houses at least a motor and a motion transmission mechanism that transmits the rotation output of the motor to the tip tool 9. The motion transmission mechanism converts the motor rotation output decelerated by the speed reduction mechanism into a reciprocating motion and transmits the striking motion to the tip tool 9, and transmits the motor rotation output decelerated by the speed reduction mechanism to the tip tool 9. A rotation mechanism. The grip portion 3 is provided with a trigger switch 8. When an operator pulls the trigger switch 8, the motor rotates by receiving power from the secondary battery, and the motion transmission mechanism transmits the motor rotation output to the tip tool 9. To do.

  The grip portion 3 includes a handle 3a extending substantially orthogonal to the axial direction of the tip tool 9, a lower extending portion 3b extending substantially parallel to the axial direction from the lower end side of the handle 3a, and an upper end of the handle 3a. And an upper extension portion 3c extending substantially parallel to the axial direction from the side. In the electric power tool 1, the main body portion 2 and the grip portion 3 are configured as separate components, and the grip portion 3 is connected to the rear side of the main body portion 2 by the first connecting portion 5 and the second connecting portion 7. In addition, the protective cover 6 which can be expanded-contracted is provided in the outer side of the 2nd connection part 7, and it protects so that the 2nd connection part 7 may not be exposed outside. The first connecting part 5 and the second connecting part 7 constitute a vibration isolation structure in the electric power tool 1.

  The 1st connection part 5 connects the main-body part 2 and the holding part 3 so that rotation is possible. The 1st connection part 5 may have a screw member which connects the front-end part of the lower side extension part 3b, and the housing | casing rear side lower part of the main-body part 2 so that rotation is possible. The first connecting portion 5 is provided on each of the left and right side portions of the electric tool 1.

  FIG. 2 shows an example of the structure of the second connecting portion 7. The second connecting portion 7 includes a coil spring 12 that is an elastic body provided between the main body portion 2 and the grip portion 3, and a guide rod 13 that maintains the load direction applied to the coil spring 12 in the axial direction of the coil spring 12. In the second connecting portion 7, the coil spring 12 is provided between the main body portion 2 and the grip portion 3 so as to be interlocked with the movement of the guide rod 13, and the guide rod 13 extends in the axial direction of the coil spring 12. Has the role of matching the direction.

  FIG. 3 shows an example of the configuration of the guide rod 13. The guide rod 13 is a rod-shaped member made of a resin material, and has a first opening 13a on one end side and a second opening 13b on the other end side. The second opening 13b is a through hole that extends in the longitudinal direction of the guide rod 13, and has a rectangular area and a cross section in which both end sides of the rectangular area are semicircular areas. The first opening 13a is formed as a through hole having a circular cross section.

  Returning to FIG. 2, a cylindrical first rotating shaft 10 extending in the left-right direction is provided on the upper rear side of the main body 2, and a second cylindrical rotation extending in the left-right direction is provided on the front end side of the upper extension 3 c. A shaft 11 is provided. The first rotating shaft 10 is inserted into the first opening 13 a of the guide rod 13 and the second rotating shaft 11 is inserted into the second opening 13 b of the guide rod 13, so that the main body 2 and the grip 3 are connected to the guide rod. 13 are connected so as to be relatively rotatable. The second opening 13b has a shape in which the second rotating shaft 11 is slidable in the longitudinal direction of the guide rod 13, and is formed as a through-hole as shown in FIG.

  In the embodiment, the guide rod 13 is inserted inside the coil spring 12 and disposed on the axis of the coil spring 12. Thereby, the 2nd connection part 7 can be comprised compactly. The guide rod 13 is provided with two first spring receiving portions 14a and second spring receiving portions 14b, and the coil spring 12 is supported by the first spring receiving portion 14a and the second spring receiving portion 14b. The first spring receiving portion 14a and the second spring receiving portion 14b have the same shape, and are hereinafter referred to as “spring receiving portions 14” unless otherwise distinguished.

  FIG. 4 shows an example of the configuration of the spring receiving portion 14. The spring receiving portion 14 stands up from the outer periphery of the spring receiving surface 15a, the spring receiving surface 15a with which the end of the coil spring 12 abuts, the insertion hole 15b through which the guide rod 13 is inserted, and prevents the spring end from being laterally displaced. And an annular upright portion 15c.

  Returning to FIG. 2, the first spring receiving portion 14 a is pressed against and contacts the first rotating shaft 10 by the coil spring 12, and the second spring receiving portion 14 b is pressed against and contacted with the second rotating shaft 11 by the coil spring 12. . By receiving both ends of the coil spring 12 by the first spring receiving portion 14 a and the second spring receiving portion 14 b arranged on the guide rod 13, the coil spring 12 is integrated with the guide rod 13 against vibration and impact of the main body portion 2. It will move.

  5 and 6 are diagrams for explaining the operation of the vibration isolation structure of the embodiment. As shown in FIG. 5, when vibration or impact occurs in the main body 2 during work, the gripping portion 3 rotates in the direction indicated by the arrow A with the first coupling portion 5 as a rotation fulcrum due to the anti-vibration structure. The guide rod 13 converts the rotational movement of the grip portion 3 into the direction indicated by the arrow B, that is, the linear movement in the longitudinal direction of the guide rod 13 by sliding the second rotation shaft 11 in the second opening 13b.

  FIG. 6 shows a state in which the grip portion 3 is relatively approached by rotating with respect to the main body portion 2. In the process in which the grip portion 3 is relatively close to the main body portion 2, vibration absorption by the coil spring 12 is performed. FIG. 6 shows a state in which the second rotating shaft 11 has moved in the second opening 13b and the coil spring 12 has been compressed. The guide rod 13 always converts the rotational motion of the grip portion 3 into a linear motion in the direction indicated by the arrow B. Therefore, the load direction applied to the coil spring 12 interlocked with the guide rod 13 is maintained in the direction of arrow B, that is, the axial direction of the coil spring 12.

  According to the embodiment, the coil spring 12 receives a load in the axial direction and compresses and expands so that the spring constant is kept constant in the process of compression and extension. realizable. Further, since the coil spring 12 does not receive a load obliquely with respect to the axial direction, the spring life can be extended without deteriorating the spring characteristics of the coil spring 12. In particular, when the power tool 1 is downsized and the distance between the first connecting portion 5 and the second connecting portion 7 is shortened, the vibration isolating structure according to the embodiment exhibits the above effects more remarkably.

  FIG. 7 shows an example of the structure of the first connecting portion 5. In the 1st connection part 5, the thread groove is cut in the housing | casing rear side lower part of the main-body part 2, and the screw member 18 is penetrated by the spacer 17 arrange | positioned at the through-hole of the lower side extension part 3b. The main body 2 is fastened. Thereby, the lower extension part 3b is rotatably supported with respect to the main body part 2. The spacer 17 may be formed of an elastic material. By giving the spacer 17 elasticity, the first connecting portion 5 can have a vibration absorbing function.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each component or combination of each processing process, and such modifications are within the scope of the present invention. .

  In the embodiment, the second connecting portion 7 in which the guide rod 13 is inserted into the coil spring 12 and the guide rod 13 and the coil spring 12 are integrally formed is shown. In the modification, the guide rod 13 and the coil spring 12 may be separately arranged on condition that the load direction applied to the coil spring 12 by the guide rod 13 is maintained in the axial direction of the coil spring 12. In this case, a plurality of guide rods 13 may be provided, and a plurality of coil springs 12 may be provided. In addition, when providing the coil spring 12 with two or more, it is preferable that the coil spring 12 is arranged in parallel in the left-right direction.

  In the embodiment, the first rotating shaft 10 is inserted into the first opening 13 a of the guide rod 13 and the second rotating shaft 11 is inserted into the second opening 13 b of the guide rod 13. The rotating shaft 11 may be inserted, and the first rotating shaft 10 may be inserted into the second opening 13b. In the embodiment, the second opening 13b is formed as a through hole, but both the first opening 13a and the second opening 13b may be formed as a through hole. Although the coil spring 12 is shown as an example of an elastic body, a spring different from the coil spring 12 may be used as the elastic body, or a rubber body formed of a resin material may be used.

The outline of one embodiment of the present invention is as follows.
An electric power tool (1) according to an aspect of the present invention includes a main body (2) that houses a motor and a motion transmission mechanism that transmits a rotation output of the motor to a tip tool (9), and a rear side of the main body. The grip part (3) connected by the 1 connection part (5) and the 2nd connection part (7) is provided. A 1st connection part (5) connects a main-body part (2) and a holding part (3) so that rotation is possible, and a 2nd connection part (7) is a main-body part (2) and a holding part (3). It has an elastic body (12) provided therebetween, and a guide rod (13) that maintains the load direction applied to the elastic body in the axial direction of the elastic body.

  The guide rod (13) includes a first opening (13a) into which the first rotating shaft (10) on the main body side is inserted and a second opening (13b) into which the second rotating shaft (11) on the gripping side is inserted. The first opening or the second opening may have a shape in which the first rotating shaft or the second rotating shaft is slidable in the longitudinal direction of the guide rod. The first opening (13a) or the second opening (13b) may have a shape of a long hole extending in the longitudinal direction of the guide rod.

  The elastic body may be a coil spring (12), and the guide rod (13) may be inserted into the coil spring (12). The guide rod (13) may be provided with a pair of spring receiving portions (14a, 14b) for receiving both ends of the coil spring (12). The pair of spring receiving portions are respectively a first rotating shaft (10) and a second rotating shaft. You may contact | abut to a rotating shaft (11).

DESCRIPTION OF SYMBOLS 1 ... Electric tool, 2 ... Main-body part, 3 ... Holding part, 3a ... Handle, 3b ... Lower extension part, 3c ... Upper extension part, 5 ... 1st connection part, 7 ... 2nd connection part, 10 ... 1st rotating shaft, 11 ... 2nd rotating shaft, 12 ... Coil spring, 13 ... Guide rod, 13a ... 1st 1 opening, 13b ... 2nd opening, 14a ... 1st spring receiving part, 14b ... 2nd spring receiving part.

Claims (6)

A main body that houses the motor and a motion transmission mechanism that transmits the rotational output of the motor to the tip tool;
A power tool including a grip portion connected to the rear side of the main body portion by a first connection portion and a second connection portion,
The first connecting part rotatably connects the main body part and the grip part,
The second connecting portion includes an elastic body provided between the main body portion and the grip portion, and a guide rod that maintains a load direction applied to the elastic body in an axial direction of the elastic body.
An electric tool characterized by that. The guide rod has a first opening into which the first rotation shaft on the main body portion side is inserted and a second opening into which the second rotation shaft on the grip portion side is inserted, and the first opening or the first The two openings have a shape in which the first rotating shaft or the second rotating shaft is slidable in the longitudinal direction of the guide rod.
The power tool according to claim 1. The first opening or the second opening has a shape of a long hole extending in a longitudinal direction of the guide rod.
The power tool according to claim 2, wherein: The elastic body is a coil spring, and the guide rod is inserted into the coil spring.
The power tool according to claim 3. A pair of spring receiving portions that receive both ends of the coil spring are disposed on the guide rod.
The power tool according to claim 4, wherein: The pair of spring receiving portions are in contact with the first rotating shaft and the second rotating shaft, respectively.
The power tool according to claim 5, wherein

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