JP2007054934A - Connecting tool and impact tool provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting tool which reduces noise, while maintaining high versatility, and also to provide an impact tool provided with the connecting tool. <P>SOLUTION: The connecting tool 15 for connecting: a distal end tool 4 of the impact tool for transmitting rotating power from a motor to an impact mechanism part via a deceleration mechanism part and intermittently transmitting rotary impact force generated in the impact mechanism part to the distal end tool 4; and the impact mechanism part (anvil 3), is constituted by fitting a socket adapter (first adapter) 16 attachably/detachably mounted on the anvil 3 and a bit adapter (second adapter) 17 for attachably/detachably mounting the distal end tool 4 and interposing an elastic body 18 in the fitting part. The elastic body 18 is constituted of an integrally formed bottomed cylindrical body, and is interposed in axial direction and rotating direction of the fitting part of the socket adapter 16 and the bit adapter 17. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an impact tool for generating a rotating impact force and performing a required operation such as screw tightening or bolt tightening, and a connection tool provided on the impact tool.

  The impact tool as one form of the electric tool generates a rotary impact force by using a motor as a drive source to rotate the tip tool, and intermittently applies the impact force to the tool to perform operations such as screw tightening and bolt tightening. However, since it has features such as small recoil and high tightening ability, it is widely used at present. However, since it has an impact mechanism that generates a rotating impact force, noise during operation is large, and this noise is a problem.

  FIG. 7 shows a longitudinal section of a general impact tool conventionally used.

  The conventional impact tool shown in FIG. 7 uses the battery pack 1 as a power source and the motor 2 as a drive source, and transmits the rotational power from the motor 2 to the impact mechanism section through the speed reduction mechanism section. The rotary impact generated in the mechanism is intermittently transmitted to the tip tool 4 to perform operations such as screw tightening.

  That is, in the impact mechanism unit built in the hammer case 5, the rotation of the output shaft (motor shaft) of the motor 2 is decelerated through the planetary gear mechanism 6 constituting the decelerating mechanism unit and transmitted to the spindle 7, The spindle 7 is rotationally driven at a predetermined speed. Here, the spindle 7 and the hammer 8 are connected by a cam mechanism, and this cam mechanism is formed on the V-shaped spindle cam groove 7 a formed on the outer peripheral surface of the spindle 7 and the inner peripheral surface of the hammer 8. Further, it is composed of a V-shaped hammer cam groove 8a and a ball 9 engaged with these cam grooves 7a, 8a.

  Further, the hammer 8 is always urged by the spring 10 in the distal direction (rightward in FIG. 7), and at rest, the ball 9 and the cam grooves 7a and 8a are engaged with each other so that a gap is separated from the end surface of the anvil 3. In the position. And the convex part is each formed in two places on the rotation plane which the hammer 8 and the anvil 3 mutually oppose. In addition, the rotation direction of the screw 11, the tip tool 4, and the anvil 3 is mutually restrained. In FIG. 7, reference numeral 14 denotes a bearing metal for rotatably supporting the anvil 3.

  Thus, when the spindle 7 is rotationally driven as described above, the rotation is transmitted to the hammer 8 through the cam mechanism, and the convex portion of the hammer 8 is anvil before the hammer 8 is rotated halfway. 3 is engaged to rotate the anvil 3. When the relative reaction occurs between the hammer 8 and the spindle 7 due to the reaction force of the engagement, the hammer 8 is inserted into the spindle cam groove 7 a of the cam mechanism. Along with this, the spring 10 is compressed and starts to move backward toward the motor 2 side. When the protrusion of the hammer 8 moves over the protrusion of the anvil 3 by the backward movement of the hammer 8 and the engagement between the two is released, the hammer 8 is accumulated in the spring 10 in addition to the rotational force of the spindle 7. While being accelerated rapidly in the rotational direction and forward by the action of the elastic energy and the cam mechanism, the spring 10 is moved forward by the biasing force of the spring 10, and the convex portion is re-engaged with the convex portion of the anvil 3 to rotate integrally. Begin to. At this time, since a strong rotational impact force is applied to the anvil 3, the rotational impact force is transmitted to the screw 11 through the tip tool 4 attached to the anvil 3.

  Thereafter, the same operation is repeated, and the rotational impact force is intermittently and repeatedly transmitted from the tip tool 4 to the screw 11, and the screw 11 is screwed into the wood 12 that is the material to be fastened.

  By the way, during the work using such an impact tool, the hammer 8 also performs a back-and-forth motion simultaneously with the rotational motion, so that these motions become a vibration source, and the vibration energy is transmitted through the anvil 3, the tip tool 4 and the screw 11. Then, it is transmitted to the wood 12 which is a material to be fastened. In this case, since the surface area of the wood 12 is large, a large noise is generated from the wood 12.

  Therefore, in order to reduce noise, it is important to keep the vibration energy in the axial direction and the vibration energy of the radial rotational force transmitted to the tip tool 4 small.

  Therefore, Patent Document 1 proposes a low noise type socket wrench having a buffer function. In this socket wrench, a metal body is disposed at a contact portion of the socket portion with an object to be fastened, and a buffer body is interposed between the socket portion and the metal body. Since the impact sound generated during the tightening work such as can be reduced by the buffer, low noise can be realized.

Patent Document 2 proposes an impact tool that can reduce noise generated from a material to be tightened. In this impact tool, an anvil is divided into a rotary hitting member and a tip tool mounting member, and an elastic body or a cushioning material is interposed in an axial gap between the rotary hitting member and the tip tool mounting member. For example, the vibration energy in the axial direction acting on the tip tool or the screw can be reliably reduced by the elastic body or the cushioning material, and the vibration energy transmitted to the material to be fastened can be suppressed to a low level, thereby realizing low noise.
JP 11-207648 A JP 7-237152 A

  However, the socket wrench disclosed in Patent Document 1 has a problem of poor versatility, for example, a plurality of types of socket wrench must be prepared according to the size of bolts and nuts. There is also a problem that it cannot be used for tightening a wood screw or the like having a cross groove.

  Moreover, in the impact tool disclosed in Patent Document 2, since the elastic body or the cushioning material is interposed only in the axial direction, the vibration energy in the radial direction cannot be reduced, which is insufficient for low noise. Met. Further, since the tip tool is integrated with the impact tool main body, if the impact tool main body is not purchased separately, for example, it cannot be changed from bolt tightening to nut tightening, and there is a problem that versatility is poor.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to provide a connection tool that can realize low noise while maintaining high versatility, and an impact tool including the connection tool. It is in.

  In order to achieve the above object, according to the first aspect of the present invention, the rotational power from the motor is transmitted to the impact mechanism through the speed reduction mechanism, and the rotary impact generated in the impact mechanism is intermittently applied to the tip tool. A first adapter that is detachably attached to the impact mechanism portion, and a second adapter that is detachably attached to the tip tool of the impact tool transmitted to the impact mechanism portion. The adapter is fitted, and an elastic body is interposed in the fitting portion.

  According to a second aspect of the present invention, in the first aspect of the invention, the elastic body is interposed in the axial direction and the rotational direction of the fitting portion of the first adapter and the second adapter. .

  A third aspect of the invention is characterized in that, in the second aspect of the invention, the elastic body is constituted by a bottomed cylindrical body integrally formed.

  The invention according to claim 4 is an impact tool that transmits rotational power from a motor to an impact mechanism through a speed reduction mechanism, and intermittently transmits a rotational impact generated in the impact mechanism to a tip tool. The tip tool and the impact mechanism portion are detachably connected with a connection tool, and the connection tool is detachably attached to the first adapter that is detachably attached to the impact mechanism portion. The second adapter to be fitted is fitted, and an elastic body is interposed in the fitting portion.

  The invention according to claim 5 is the invention according to claim 4, wherein the elastic body is interposed in the axial direction and the rotational direction of the fitting portion of the first adapter and the second adapter of the connection tool. Features.

  A sixth aspect of the invention is characterized in that, in the fifth aspect of the invention, the elastic body is formed of a bottomed cylindrical body integrally formed.

  According to the first and fourth aspects of the present invention, the connection tool for connecting the impact mechanism portion of the impact tool and the tip tool can be attached to and detached from the first adapter that is detachably attached to the impact mechanism portion. Since it comprised by fitting the 2nd adapter to mount | wear, it is not necessary to prepare several types of connection tools according to the size of a screw or a bolt, and high versatility is ensured. Also, the vibration energy from the impact mechanism is effectively absorbed by the elastic body provided in the connecting tool, and the vibration energy transmitted from the tip tool to the material to be tightened via the screw or the like is kept low. Noise reduction is realized.

  According to invention of Claim 2 and 5, since the elastic body was interposed in the axial direction and rotation direction of the fitting part of the 1st adapter of a connection tool, and a 2nd adapter, the axial direction from an impact mechanism part and The vibration energy in the rotational direction is reliably reduced by the elastic body, and further noise reduction is realized.

  According to the inventions of claims 3 and 6, since the elastic body is constituted by a bottomed cylindrical body integrally formed, it is easy to incorporate the elastic body, and when the elastic body is deteriorated due to secular change or excessively In the case of wear due to the impact, it can be easily replaced with a new one.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a side sectional view of an impact tool tip according to the invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. FIG. 5 is an enlarged detail view of a portion D in FIG. 1, and FIG. 6 is a perspective view of an elastic body.

  The impact tool according to the present invention is a cordless hand-held tool using a battery pack as a power source and a motor as a drive source, and the configuration thereof is the same as that of the conventional impact tool shown in FIG. . Therefore, in the following description, the description of the same configuration as that shown in FIG. 7 is omitted, and only the characteristic configuration of the present invention will be described.

  As shown in FIG. 1, the impact tool according to the present invention is characterized in that a connection tool 15 for connecting the tip tool 4 and the anvil 3 of the impact mechanism section is provided.

  Here, the connection tool 15 is engaged with a socket adapter 16 that is a first adapter that is detachably attached to the anvil 3 and a bit adapter 17 that is a second adapter that is detachably attached to the tip tool 4. The elastic body 18 is interposed in the fitting portion.

  That is, the hexagonal hole 3a is formed in the axial center part of the front-end | tip part (right end of FIG. 1) of the anvil 3 (refer FIG. 2), The hexagonal column shape of the socket adapter 16 of the connection tool 15 is formed in this hexagonal hole 3a. The shaft portion 16a is inserted and fitted. In addition, the square pillar part 16b is integrally formed in the front-end | tip part of the socket adapter 16 (refer FIG. 4).

  An engagement groove 16c for retaining is formed over the entire circumference in the longitudinal direction intermediate portion of the shaft portion 16a of the socket adapter 16, and a long hole 3b is formed at two outer circumferences of the distal end portion of the anvil 3. (Refer to FIG. 5) is formed, and a steel ball 19 is accommodated in each elongated hole 3b so as to be movable in the radial direction. The inner diameter of each long hole 3b formed in the anvil 3 is set to a value at which the steel ball 19 does not fall into the hexagon hole 3a of the anvil 3.

  In addition, a guide sleeve 20 is fitted on the outer peripheral portion of the tip of the anvil 3 so as to be rotatable and slidable in the front-rear direction (in the directions of arrows a and b in FIG. 1). The step portion 20a (see FIG. 5) is integrally projected. The guide sleeve 20 is prevented from coming off from the anvil 3 in the axial direction by a washer 21 and a snap ring 22. The guide sleeve 20 is a compression spring that is compressed between the stepped portion 20 a and the washer 21. 23 is always urged backward (in the direction of arrow b in FIG. 1). Accordingly, the guide sleeve 20 is normally stationary when its step portion 20a abuts against the step portion 3c of the anvil 3 as shown in detail in FIG. The step portion 20a is pressed inward in the radial direction to engage with the engaging groove 16c formed in the shaft portion 16a of the socket adapter 16, whereby the socket adapter 16 is fixedly held on the anvil 3, and the Omission is prevented.

  If the guide sleeve 20 is moved forward (in the direction of arrow a in FIG. 1) against the urging force of the compression spring 23 from the above state, the steel ball 19 is radially inward by the step portion 20a of the guide sleeve 20. Is released and the engagement of the steel ball 19 with the engagement groove 16c of the socket adapter 16 is released, so that the socket adapter 16 can be attached to and detached from the anvil 3.

  On the other hand, a hexagonal hole 17a is formed at the axial center of the tip of the bit adapter 17 of the connection tool 15 (see FIG. 3), and the hexagonal columnar shaft 4a of the tip tool 4 is formed in the hexagonal hole 17a. It is inserted and fitted.

  An engagement groove 4b for retaining is formed over the entire circumference in the longitudinal direction intermediate portion of the shaft portion 4a of the tip tool 4, and a long hole is formed in two places on the outer periphery of the tip portion of the bit adapter 17. 17b is formed, and a steel ball 24 is accommodated in each elongated hole 17b so as to be movable in the radial direction. The inner diameter of each elongated hole 17b formed in the bit adapter 17 is set to a value at which the steel ball 24 does not fall into the hexagonal hole 17a of the bit adapter 17.

  Further, a ring 25 made of a spring steel plate is fitted to the outer peripheral portion of the tip of the bit adapter 17, and as shown in FIG. 1, in a state where the tip tool 4 is attached to the hexagon hole 17a of the bit adapter 17, The steel ball 24 is pressed radially inward by the ring 25 and engages with the engagement groove 4b of the tip tool 4, whereby the tip tool 4 is fixedly held by the bit adapter 17 and the removal thereof is prevented. It is. In addition, when exchanging the tip tool 4 according to the head shape of the screw 11, the tip tool 4 can be easily attached to and detached from the hexagon hole 17 a of the bit adapter 17.

  By the way, a rectangular hole-shaped fitting hole 17d opening rearward is formed at the axial center of the rear end large-diameter portion 17c of the bit adapter 17, and the front end of the socket adapter 16 is formed in the fitting hole 17d. The rectangular column part 16b formed in the part is fitted, and the socket adapter 16 and the bit adapter 17 are connected by this fitting. As shown in FIG. 1 and FIG. And the elastic body 18 which can be attached or detached is interposed in the rotation direction.

  As shown in FIG. 6, the elastic body 18 is integrally formed of a rubber or the like into a bottomed rectangular tube shape (bag shape), and is interposed between the fitting portion of the socket adapter 16 and the bit adapter 17. Then, the rectangular column part 16 b of the socket adapter 16 is entirely covered with the elastic body 18. The elastic body 18 is attached with a crushing margin of 0.5 mm to 1 mm in the radial direction in order to prevent dropping.

  Thus, also in the impact tool according to the present invention, the rotational impact force generated in the impact mechanism portion constituted by the hammer 8 and the anvil 3 is intermittently applied to the screw 11 from the anvil 3 through the connection tool 15 and the tip tool 4. The screw 11 is screwed into the wood 12 which is a material to be fastened.

  As described above, in the impact tool according to the present invention, the connection tool 15 for connecting the anvil 3 and the tip tool 4 constituting the impact mechanism portion is detachably attached to the socket adapter 16 and the tip tool 4 that are detachably attached to the anvil 3. Since it is configured by fitting the bit adapter 17 that can be mounted, it is not necessary to prepare a plurality of types of connection tools 15 according to the size of the screws and bolts, and versatility is improved.

  Further, the vibration energy from the impact mechanism is effectively absorbed by the elastic body 18 provided in the fitting portion between the socket adapter 16 and the bit adapter 17 of the connection tool 15, and the wood from the tip tool 4 through the screw 11. Since the vibration energy transmitted to 12 is kept small, noise reduction is realized. In particular, in the present embodiment, the elastic body 18 is integrally formed in a bottomed rectangular tube shape (bag shape), and this is interposed in the axial direction and the rotation direction of the fitting portion of the socket adapter 16 and the bit adapter 17. The axial vibration energy from the impact mechanism is absorbed by the bottom portion 18a of the elastic body 18, and the vibration energy in the rotational direction is absorbed by the outer peripheral portion 18b of the elastic body 18, thereby further reducing noise. Is done.

  Further, since the elastic body 18 is integrally formed into a bottomed rectangular tube shape (bag shape), it is easy to incorporate the elastic body 18 and the elastic body 18 is deteriorated due to secular change or worn due to excessive impact. For example, this can be easily replaced with a new one.

  As a result of the above, according to the present invention, it is possible to achieve the object of realizing noise reduction while maintaining high versatility.

  INDUSTRIAL APPLICABILITY The present invention is particularly useful for reducing noise by applying it to an impact tool such as a hammer drill for generating a rotary striking force and performing a required work and a connection tool provided on the impact tool.

It is a sectional side view of the impact tool front-end | tip part which concerns on invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. FIG. 2 is an enlarged detail view of a D part in FIG. 1. It is a perspective view of an elastic body. It is a sectional side view of the conventional impact tool.

Explanation of symbols

1 Battery pack 2 Motor 2a Output shaft (motor shaft)
3 anvil 3a hexagonal hole 3b long hole 3c stepped part 4 tip tool 4a shaft 4b engagement groove 5 hammer case 6 planetary gear mechanism 7 spindle 7a spindle cam groove 8 hammer 8a hammer cam groove 9 ball 10 spring 11 screw 12 wood 14 bearing metal 15 Connection tool 16 Socket adapter (first adapter)
16a Shaft portion 16b Square column portion 16c Engaging groove 17 Bit adapter (second adapter)
17a Hexagonal hole 17b Long hole 17c Rear end large diameter portion 17d Fitting hole 18 Elastic body 18a Elastic body bottom portion 18b Elastic body outer peripheral portion 19 Steel ball 20 Guide sleeve 20a Step portion 21 Washer 22 Snap ring 23 Compression spring 24 Steel ball 25 Ring

Claims (6)

The tip tool of the impact tool and the impact mechanism unit that transmit rotational power from the motor to the impact mechanism unit through the speed reduction mechanism unit, and intermittently transmit the rotational impact generated by the impact mechanism unit to the tip tool; A connecting tool for connecting
A first adapter that is detachably attached to the impact mechanism part and a second adapter that is detachably attached to the tip tool are fitted together, and an elastic body is interposed in the fitting part. A featured connection tool.   The connection tool according to claim 1, wherein the elastic body is interposed in an axial direction and a rotation direction of a fitting portion between the first adapter and the second adapter.   The connecting tool according to claim 2, wherein the elastic body is constituted by a bottomed cylindrical body integrally formed. In the impact tool that transmits the rotational power from the motor to the impact mechanism through the speed reduction mechanism, and intermittently transmits the rotational impact generated in the impact mechanism to the tip tool.
The tip tool and the impact mechanism portion are detachably connected with a connection tool, and the connection tool is detachably attached to the first adapter that is detachably attached to the impact mechanism portion. An impact tool characterized in that a second adapter to be fitted is fitted and an elastic body is interposed in the fitting portion.   The impact tool according to claim 4, wherein the elastic body is interposed in an axial direction and a rotation direction of a fitting portion of the first adapter and the second adapter of the connection tool.   The impact tool according to claim 5, wherein the elastic body is formed of a bottomed cylindrical body integrally formed.

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