JP2011067898A - Attachment for rotary tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an entire tool body or attachment from dropping off from a rotary tool even when a shank is broken or an anvil and a chuck of the rotary tool are damaged in the attachment for the rotary tool. <P>SOLUTION: The attachment for a rotary tool includes the tool body 2 and the shank 3 projecting from the rear end of the tool body 2 to be mounted on the rotary tool, a sleeve 5 is fixed to the rear end of the tool body 2 in a state externally suitable for the shank 3, a rotor 6 is externally fittingly held to freely rotate around the sleeve 5, and a string connection part 22 to which a connection string member 21 is tied is arranged in the rotor 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an attachment for a rotating tool.

Attachments such as box wrench, bit holder, drill chuck, hexagon wrench, etc. are attached to handy type work machines (hereinafter referred to as “rotary tools”) such as electric or pneumatic drivers, impact drivers, or drills. It is well known to use.
In this type of attachment, a shank (polygonal or circular shaft such as a hexagonal cross section) protrudes from the rear end of the tool body, and this shank is held on the anvil part or chuck part of the rotary tool. Thus, the rotary tool is mounted.

  Conventionally, this attachment has been secured by preventing the connecting part between the tool body and the shank from being damaged or escaping during work with a rotary tool (especially in the case of impact drivers, etc.). A structure that can be stopped (a coupling force is obtained) has been proposed (see Patent Document 1).

Japanese Patent No. 2501744

As a result of the conventional proposed structure, the attachment of the tool body and the shank can be reliably prevented from coming off as an attachment. As a result, the connection part can be damaged or escaped while working with a rotating tool. The problem of the tool body falling as a cause has been resolved.
However, when the shank breaks or the anvil part or the chuck part of the rotary tool is damaged, it is assumed that the tool body or the attachment is detached from the rotary tool as a whole. Under such an assumption, the tool body or the attachment may fall as a whole during the operation with the rotary tool.

  The present invention has been made in view of the above circumstances, and in the unlikely event that the shank breaks or the anvil part or chuck part of the rotary tool breaks, the tool body and attachment as a whole fall from the rotary tool. It is an object of the present invention to provide an attachment for a rotary tool that can prevent this from occurring.

In order to achieve the above object, the present invention has taken the following measures.
That is, the rotary tool attachment according to the present invention includes a tool body and a shank that protrudes from the rear end portion of the tool body and allows attachment to the rotary tool. The sleeve is fixed so as to be fitted to the shank, and a rotating body is rotatably fitted around the sleeve, and a string connecting portion for fixing the connecting string member to the rotating body is provided. ing.

  With such a configuration, if the string member is connected to the string connecting portion of the rotating body and the other end of the string member is anchored to the rotary tool or the operator, the rotating body is fixed to the tool body. Therefore, even if the shank breaks or the anvil part or chuck part of the rotating tool breaks, it is possible to prevent the tool body and the attachment from dropping as a whole from the rotating tool.

  A tail hole is formed in the rear part of the tool body, and one end of the sleeve is fitted into the tail hole. The sleeve hole formed in the sleeve is fitted into the tail hole of the tool body. It has a small-diameter hole portion formed in the region to be formed and a large-diameter hole portion other than this small-diameter hole portion. The large-diameter hole portion is formed with an inner diameter that allows the shank to be inserted, It is preferable that the small hole portion is formed to have a diameter smaller than that of the large diameter hole portion so that the press-fitting of the shank is required.

  In this way, when assembling the attachment, the tool body, the sleeve, and the shank can be assembled by simply pressing the shank into the sleeve with the sleeve fitted into the tail hole of the tool body. Person can be fixed at once. That is, no troublesome work such as welding or screwing is required, the assembling work can be performed very easily and quickly, and various advantages can be obtained such that the shank can be firmly fixed to the tool body. .

It is preferable that the sleeve is provided with a retaining rod for engaging and holding the rotating body externally fitted around the sleeve toward the tool body.
By doing so, it is possible to easily obtain the action of preventing the rotor from escaping from the sleeve, which leads to easy assembly work and simplification of the structure.
The rotating body is preferably formed in a short cylindrical shape in a circumferential direction surrounding the sleeve.

  Thus, there exists an advantage which can smooth the free rotation of the rotary body around a sleeve by making a rotary body into a short cylinder shape.

  The attachment for a rotary tool according to the present invention can prevent the tool body and the attachment from dropping as a whole from the rotary tool even if the shank is broken or the anvil part or chuck part of the rotary tool is damaged. become.

It is the sectional side view which showed 1st Embodiment of the attachment which concerns on this invention. It is the perspective view which showed 1st Embodiment of the attachment which concerns on this invention. It is the sectional side view which decomposed | disassembled and showed 1st Embodiment of the attachment which concerns on this invention. It is the sectional side view which showed 2nd Embodiment of the attachment which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of a rotary tool attachment 1 according to the present invention. The attachment 1 includes a tool body 2 and a shank 3 provided so as to protrude from the rear end portion of the tool body 2.
The tool main body 2 illustrated in the first embodiment is a box wrench having a hexagonal recess 2a for fitting a nut at the tip of the body having a hollow cylindrical shape inside.

  The shank 3 is a shaft having a circular cross section or a polygonal shape such as a hexagon. The shank 3 can be mounted on a rotary tool such as an electric screwdriver, an electric impact screwdriver, or an electric drill (or an air driven type thereof). And it is a part used as the rotating shaft (support axis) at the time of work. The shank 3 is preferably forged with a high alloy steel (for example, nickel chrome molybdenum steel) excellent in wear resistance and toughness.

The tool body 2 and the shank 3 are connected to each other by forming a connecting hole 4 slightly smaller than the outer diameter (diagonal dimension in the case of a hexagonal cross section) of the shank 3 at the rear part of the tool body 2. 4, the tip of the shank 3 is press-fitted.
The connection hole 4 is arranged in a positional relationship that is coaxial with the tool body 2 (hexagonal recess 2a) and communicates with a hollow portion in the tool body 2, and therefore the tool body 2 Is penetrated in the front-rear direction from the hexagonal recess 2 a to the connection hole 4.

In the attachment 1 according to the present invention, a sleeve 5 is fixed to the rear end portion of the tool body 2 so as to be externally fitted to the shank 3, and the rotating body 6 is rotatable around the sleeve 5. Is held externally.
As shown in FIG. 3, a tail hole 10 is formed in the rear part of the tool body 2 so that one end of the sleeve 5 can be fitted. The tail hole 10 is concentric with the connection hole 4, and naturally has a larger diameter than the connection hole 4. Therefore, an annular gap can be formed between the inner peripheral portion of the tail hole 10 and the outer peripheral surface of the shank 3 that is press-fitted and fixed in the connecting hole 4. The annular gap is formed in the sleeve 5. This is the plug-in fee.

  In the first embodiment, a short tubular collar 11 is inserted into the tail hole 10, and a fitting relationship with the outer diameter of the sleeve 5 is generated as the inner diameter of the collar 11. . That is, the collar 11 has a spacer-like role with the outer peripheral surface of the sleeve 5. It goes without saying that such a collar 11 can be omitted if the inner diameter of the tail hole 10 can accurately correspond to the outer diameter of the sleeve 5.

The sleeve 5 is formed in a tubular shape, and a sleeve hole 15 penetrating in the longitudinal direction is provided therein. The sleeve hole 15 includes a small-diameter hole portion 16 corresponding to a region fitted to the tail hole 10 of the tool body 2 and a large-diameter hole portion formed in a region other than the small-diameter hole portion 16. 17.
The large-diameter hole portion 17 is formed with an inner diameter that allows the shank 3 to be inserted in a fitting relationship of a loose fit (a dimension that facilitates the insertion and does not cause large backlash in the inserted shank 3).

The small-diameter hole portion 16 is formed smaller in diameter than the large-diameter hole portion 17 to the extent that press-fitting is required when the shank 3 is inserted. Specifically, it has an inner diameter that allows the shank 3 to be inserted with a tight fit or a tighter fitting relationship, and has the same diameter as the connection hole 4 of the tool body 2.
Further, the sleeve 5 is used for preventing the sleeve 5 from projecting radially outward with respect to the end opposite to the small-diameter hole 16 (that is, the end that is the rear end when connected to the tool body 2). A kite 20 is provided.

When the rotary body 6 is externally fitted around the sleeve 5, the retaining rod 20 prevents the rotary body 6 from coming out backward and engages and holds the tool body 2 in an abutting state (the escape is prevented). To stop).
The rotating body 6 is formed in a short cylindrical shape that is seamless in the circumferential direction surrounding the sleeve 5, and is used to fasten a connecting string member 21 (shown only in FIG. 2) to the outer peripheral portion thereof. A string connecting portion 22 is provided. By adopting a seamless structure in this way, the rotator 6 can be a strong structure that is not easily damaged.

In the first embodiment, the entire rotating body 6 including the string connecting portion 22 is integrally formed of plastic, and the string connecting portion 22 protrudes from a part of the outer peripheral surface of the rotating body 6 in a plate shape. The protrusions 23 are provided and the through holes 24 are provided through the protrusions 23.
Although it is possible to fix the connecting string member 21 directly to the through hole 24, it is possible to attach and detach it when necessary by using a connecting tool 25 such as a spring ring or a clip. It is also possible to leave it.

The connecting string member 21 is a string-like member such as a cotton rope, a resin rope, a leather string, a metal or a resin chain, and has a flexible flexibility and an excellent tensile strength. The material and structure are not limited at all.
The cylinder hole formed inside the cylinder of the rotator 6 is formed with an inner diameter that does not cause large rattling with respect to the sleeve 5 and that the rotator 6 can freely rotate freely.

  When the attachment 1 is manufactured by assembling the tool body 2, the sleeve 5, and the rotating body 6, the sleeve 5 is fitted into the tail hole 10 (in the collar 11) of the tool body 2, and the sleeve 5 The shank 3 is inserted into the sleeve hole 15. The shank 3 is easily inserted into the large-diameter hole portion 17 in the sleeve hole 15 of the sleeve 5, but cannot be easily inserted through the small-diameter hole portion 16.

Therefore, the shank 3 is pushed from the rear in the axial direction, and is press-fitted so as to be directed from the small-diameter hole portion 16 of the sleeve 5 to the connecting hole 4 of the tool body 2.
As shown in FIG. 3, a tapered constricted portion 30 with a diameter decreasing toward the rear is provided at the tip of the shank 3, and a trapezoidal head on the tip side of the constricted portion 30. It is assumed that 3a is formed. Further, the outer diameter of the head 3 a is set to be substantially the same as the outer diameter of the shank 3.

In this way, when the shank 3 is press-fitted from the rear end side into the small-diameter hole portion 16 of the sleeve 5 and the connection hole 4 of the tool body 2, the head 3a causes the inner diameter of the small-diameter hole portion 16 to be reduced. The peripheral surface and the inner peripheral surface of the coupling hole 4 are pushed and spread.
The shavings generated during the press-fitting of the shank 3 are clogged in a circumferential groove-like gap generated on the outer peripheral side of the constricted portion 30 and bite around the constricted portion 30 while being compressed. As a result, the periphery of the tip of the shank 3 around the constricted portion 30 is fixed in a forcibly fitted shape within the connecting hole 4.

These will act even more advantageously as shakiness prevention and removal prevention of the shank 3. The shavings that are pushed out at the tip of the shank 3 are discharged from the hexagonal recess 2 a to the outside through the hollow portion of the tool body 2.
Thus, the work of assembling the tool body 2, the sleeve 5, and the shank 3 (manufacture of the attachment 1) can be performed at once without requiring any troublesome work such as welding or screwing. Become. Therefore, the assembling operation can be performed very easily and quickly, and the shank 3 can be firmly fixed to the tool body 2.

  This attachment 1 is used by connecting a string member 21 to the string connecting portion 22 of the rotating body 6 and anchoring the other end of the string member 21 to a rotary tool or an operator. Even if the attachment 1 is rotated by the rotating tool during the operation, the rotating member 6 is rotatable relative to the tool body 2 and the shank 3, so that the string member 21 connected to the rotating member 6 is entangled. No wrapping around the tool body 2 or the shank 3 will occur.

Even if the shank 3 is broken or the anvil part or chuck part of the rotary tool is broken, the rotary body 6 is held by the sleeve 5 fixed to the tool body 2 and the rotary body 6 is a string member. Since the tool 21 is tethered to the rotary tool or the operator by 21, the tool body 2 and the attachment 1 do not fall as a whole from the rotary tool.
In addition, as a connection structure between the tool body 2 and the shank 3, there is a case where a structure in which the head 3a by the constricted portion 30 is formed in the shank 3 and press-fitted into the connection hole 4 is not adopted. It is assumed that the shank 3 is damaged between the connecting portion with the tool body 2 and the mounting portion to the rotating tool during the operation with the rotating tool.

Even in this case, since the rotating body 6 is held by the sleeve 5 fixed to the tool body 2 and the rotating body 6 is anchored to the rotating tool or the operator by the string member 21, 2 and attachment 1 do not fall as a whole.
FIG. 4 shows a second embodiment of the attachment 1 according to the present invention. In the attachment 1 of the second embodiment, the rotating body 6 is made compact in the axial direction, and the sleeve 5 is directly fitted and fixed to the tail hole 10 of the tool body 2 (collar 11). Is not used).

Other configurations and operational effects are substantially the same as those of the first embodiment, and detailed description thereof is omitted here.
[Others]
The present invention is not limited to the above-described embodiment, and can be appropriately changed according to the embodiment.
The tool body 2 can also be implemented as a bit holder that can hold a driver bit, a drill bit, or the like, a drill chuck that can hold a drill, or a hex wrench.

The shape, structure, material, etc. of the rotating body 6 are not limited at all.
The retaining collar 20 provided on the sleeve 5 can also be provided in a retrofit manner by an outer retaining ring or the like.
In the illustrated embodiment, the case where the tip of the shank 3 is press-fitted into the connection hole 4 of the tool body 2 and the rotating body 6 and the sleeve 5 are integrated together is illustrated. The following configuration may be adopted as the embodiment. That is, the front end side (the left end side in FIG. 1) of the sleeve 5 on which the rotating body 6 is rotatably fitted is inserted into the connection hole of the auxiliary bush (not shown), and the head of the shank 3 is inserted from the rear end side of the sleeve 5. The portion 3a is pushed toward the connecting hole of the auxiliary bushing so that the distal end side of the sleeve 5 is expanded and pressed into the connecting hole of the auxiliary bushing, and the distal end side (head 3a side) of the shank 3 is inserted into the connecting hole of the auxiliary bushing. The rotary body 6, the sleeve 5, and the shank 3 may be assembled in advance as an integrated part by the auxiliary bushing, and the auxiliary bushing may be fitted and fixed to the connection hole 4 of the tool body 2. . In this case, the shape of the outer peripheral surface of the auxiliary bush is a hexagon (or square), and the connecting hole 4 of the tool body 2 is also a hexagonal hole (or square hole). These are transmitted, and these are prevented from being detached by a retaining means (such as a retaining ring) and connected.

  As another embodiment, when an assembly in which the rotating body 6, the sleeve 5, and the shank 3 are assembled in advance as an integrated part by the auxiliary bush is connected to a drill chuck, a positive screw is provided on the outer peripheral surface of the auxiliary bush. After screwing into the screw hole on the rear end side of the drill chuck and fixing it, another reverse screw part is screwed into the screw hole in the center portion of the auxiliary bush through the center portion of the drill chuck from the tip end side of the drill chuck. You may make it fix with.

DESCRIPTION OF SYMBOLS 1 Attachment 2 Tool main body 3 Shank 5 Sleeve 6 Rotating body 10 Tail hole 15 Sleeve hole 16 Small diameter hole part 17 Large diameter hole part 20 Locking rod 21 String member 22 String connection part

Claims (4)

In a rotary tool attachment having a tool body (2) and a shank (3) that protrudes from the rear end of the tool body (2) and enables attachment to the rotary tool,
A sleeve (5) is fixed to the rear end of the tool body (2) so as to be fitted on the shank (3).
A rotating body (6) is rotatably fitted and held around the sleeve (5), and a string connecting portion (22) for fixing the connecting string member (21) is provided on the rotating body (6). An attachment for rotating tools. A tail hole (10) is formed at the rear part of the tool body (2), and one end of the sleeve (5) is fitted into the tail hole (10).
The sleeve hole (15) formed in the sleeve (5) has a small-diameter hole portion (16) formed corresponding to a region fitted to the tail hole (10) of the tool body (2). It has a large-diameter hole portion (17) formed in a region other than the small-diameter hole portion (16),
The large-diameter hole portion (17) is formed with an inner diameter that allows the shank (3) to be inserted, and the small-diameter hole portion (16) is large-diameter hole portion (17) to the extent that the press-fitting of the shank (3) is required. The rotary tool attachment according to claim 1, wherein the attachment is formed with a smaller diameter.   The sleeve (5) is provided with a retaining rod (20) that engages and holds the rotating body (6) fitted around the sleeve (5) toward the tool main body (2). The attachment for rotary tools according to claim 1 or 2.   The rotary tool attachment according to any one of claims 1 to 3, wherein the rotating body (6) is formed in a short cylindrical shape in a circumferential direction surrounding the sleeve (5).

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