JP5045284B2 - Tightening tool - Google Patents

Description

The present invention relates to a technique of a tightening tool for tightening fastening machine parts such as bolts, screws, screws, and nuts.
More specifically, the present invention relates to a fastening tool capable of fastening a plurality of types of fastening machine parts having different external dimensions or external shapes.

Conventionally, a driver, a wrench, a spanner, and the like are known as tightening tools for tightening fastening machine parts such as bolts, screws, screws, and nuts.
Usually, in order to securely tighten the fastening machine part, a sufficient (large) tightening torque must be applied to the fastening machine part by the fastening tool. It is necessary for the engaging portion to engage with the outer dimensions and the outer shape of the fastening machine part with high accuracy (with no gap).
In addition, since the external dimensions and external shapes of the fastening machine parts are various, the fastening operation is usually performed using a dedicated tightening tool adapted to the external dimensions and external shapes of the various types of fastening machine parts. .

However, when tightening multiple types of fastening machine parts with different external dimensions and external shapes in the same work process, the operator must be able to There is a problem that it is necessary to prepare a tightening tool and change these to perform tightening, resulting in poor workability.
In addition, preparing a plurality of types of tightening tools has a problem that the burden of management in the work process (the burden of equipment management) is large.

  As an example of a tightening tool that solves the problems associated with preparing the plurality of types of tightening tools, there are a monkey wrench and a socket wrench.

  The monkey wrench can change the distance between the pair of jaws by moving in the direction in which one of the pair of jaws that are engaging parts with the bolt approaches or away from the other. It is possible to tighten a plurality of types of bolts having different head outer dimensions.

  The socket wrench includes a handle that is gripped by an operator and a plurality of sockets that are detachably fixed to the tip of the handle, and each of the plurality of sockets has a bolt head having a different external dimension and shape. Holes that conform to the shape (engage without gaps) are formed. The socket wrench can tighten a plurality of types of bolts having different external dimensions and external shapes by appropriately replacing the socket fixed to the tip of the handle.

However, the monkey wrench (a) has a pair of jaws that engage only with two of the six side surfaces (engagement surfaces) of the head of the bolt. (B) The moving jaw of the pair of jaws has a large backlash between the main body of the monkey wrench and the bolt head when tightening. Have the problem of being easily damaged.
In addition, the socket wrench (α) has the same handle portion that the operator grips with the hand, but eventually a plurality of sockets must be prepared, and the burden of management (equipment management burden) in the work process is heavy. (Β) There is a problem that the work of replacing the socket is complicated.

  As other examples of the tightening tool that solves the problems associated with preparing the plurality of types of tightening tools, there are techniques described in Patent Documents 1 to 4.

  In the technique described in Patent Document 1, an engaging portion with a bolt as a fastening machine part is formed by bundling a plurality of long strips, and the heads of the bolts are pressed against the tip portions of the plurality of long strips. And among the plurality of long strips, the one whose tip is in contact with the head of the bolt slides in the longitudinal direction and the direction of retreating from the bolt, and slides out of the long strips that did not slide The fastening tool is a tightening tool in which the side surface adjacent to the elongated body contacts the side surface (engagement surface) of the head portion of the bolt, and the engagement portion with the bolt conforms to the external dimensions and external shape of the bolt.

  The techniques described in Patent Documents 2 to 4 include biasing means (springs, airbags, etc.) for biasing a member corresponding to the elongated body in Patent Document 1 in the longitudinal direction and in a direction approaching the bolt. When the heads of the bolts are pressed against the tip portions of the plurality of long strips, the length of the plurality of long strips against the urging force of the means that urges the one that abuts against the bolt heads When the state where the bolt heads are pressed against the tips of the multiple elongated bodies is released, the multiple elongated bodies that have been retracted until then are attached. A tightening tool that slides back to its original position by the biasing force of the biasing means.

In the techniques described in Patent Literature 2 to Patent Literature 4, when the heads of the bolts are not pressed against the tip portions of the plurality of elongated members, the positions (heights) of the tip portions in the longitudinal direction of the plurality of elongated members are aligned. Yes.
Therefore, as in the tightening tool described in Patent Document 1, the operator pushes the elongated body in the retracted position by hand every time the operation of tightening the bolts having different external dimensions and external shapes is performed, and returns to the original position. Therefore, it is not necessary to perform complicated work such as aligning the ends of the long strips, and the workability is better than that of the fastening tool described in Patent Document 1.

However, in the techniques described in Patent Documents 1 to 4, in order for the engaging portion with the bolt to easily adapt to the external dimensions and external shape of the bolt, adjacent elongated members can be easily slid. In order for the long strips to be easily slidable, a certain gap must be ensured between the adjacent long strips.
Then, when the bolt is tightened, the long strip contacting the side surface (engagement surface) of the bolt moves or deforms (elastically or plastically deforms) in a direction (side) perpendicular to the longitudinal direction, which is sufficient for the bolt. There is a problem that it is difficult to tighten by applying torque.
JP-A-11-179671 Registered Utility Model No. 3043313 Japanese Utility Model Publication No. 62-58165 Japanese Patent Laid-Open No. 48-90097

  In view of the circumstances as described above, the present invention provides a fastening tool capable of fastening a plurality of types of fastening machine parts having different external dimensions and external shapes by applying sufficient torque.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1,
A tightening tool for tightening mechanical parts for fastening,
Multiple elongated bodies;
A plurality of slits having a housing hole for bundling the plurality of elongated bodies and slidably housing in the longitudinal direction and an outer peripheral surface tapered in the longitudinal direction of the housing hole and reaching the outer circumferential surface from the housing hole An inner restraint member divided into a plurality of small pieces by
An urging member that urges the plurality of elongated bodies accommodated in the accommodation holes of the inner restraining member in a direction in which the tip ends project from the opening of the accommodation hole;
A fitting hole having a tapered inner peripheral surface corresponding to the outer peripheral surface of the inner constraining member is formed, and the inner constraining member is in contact with the inner peripheral surface of the fitting hole and the outer peripheral surface of the inner constraining member. An outer restraining member for fitting the member into the fitting hole;
It comprises.

In claim 2,
The plurality of elongated bodies are:
The cross-sectional dimension is so large that the position accommodated in the said accommodation hole leaves | separates from the centerline of the said accommodation hole.

In claim 3,
The plurality of elongated bodies are:
The cross-sectional dimension is less than one half of the width of the engagement surface in the fastening machine part.

In claim 4,
The plurality of elongated bodies are made of spring steel.

In claim 5,
A male screw is formed on the outer peripheral surface of the inner restraining member, a female screw is formed on the inner peripheral surface of the fitting hole of the outer restraining member, and the outer restraining member is screwed to the inner restraining member. .

In claim 6,
A locking groove is formed on the inner peripheral surface of the housing hole of the inner restraining member to lock the plurality of elongated members facing the inner peripheral surface of the housing hole.

In claim 7,
Each of the plurality of small pieces constituting the inner restraint member is supported so as to be slidable in the radial direction of the accommodation hole of the inner restraint member and immovable in the circumferential direction of the center line of the accommodation hole, and the plurality of elongated bodies. It comprises a support member that supports.

In claim 8,
A handle fixed to the support member is provided.

In claim 9,
The handle is fixed to the support member via a ratchet mechanism.

  The present invention has an effect that a plurality of types of fastening machine parts having different external dimensions and external shapes can be tightened by applying a sufficient torque.

  Below, the fastening tool 1 which is one Embodiment of the fastening tool which concerns on this invention using FIG. 1 thru | or FIG. 9 is demonstrated.

The fastening tool 1 is a tool for fastening a fastening machine part.
Here, the “fastening machine part” is a part to be fastened by a fastening tool and used to fix an article or the like to another article or the like. Specific examples of the fastening machine parts include bolts, screws, screws, nuts, and the like.
Below, the case where the hexagon bolt 2 (refer FIG. 7 and FIG. 8) is fastened with the fastening tool 1 is demonstrated.

  As shown in FIGS. 1 and 2, the tightening tool 1 mainly includes an engaging portion 10 and a handle portion 20.

  The engaging portion 10 is engaged with a hexagon bolt 2 (see FIGS. 7 and 8) which is a mechanical part for fastening, and mainly includes a long strip group 11, an inner restraining member 12, an airbag 13, an outer restraining member 14, A support member 15 and the like are provided.

The elongated body group 11 is an embodiment of a plurality of elongated bodies according to the present invention.
As shown in FIG. 1 and FIG. 2, each of the elongated body groups 11 is a substantially cylindrical member, and the elongated bodies 11a, 11a,..., Elongated bodies 11b, 11b,. Are divided into bodies 11c, 11c... And elongated bodies 11d, 11d.
The elongated body group 11 has a diameter corresponding to the elongated bodies 11a, 11a, ..., elongated bodies 11b, 11b, ..., elongated bodies 11c, 11c, ... and elongated bodies 11d, 11d, ... It is obtained by cutting a wire made of spring steel into a predetermined length.
Here, examples of the spring steel material include SUP3, SUP4, SUP5, SUP6, SUP7, SUP9, SUP9A, SUP10, SUP11A and the like (JIS G 4801).
Examples of the wire made of spring steel include SUS302-WPA, SUS302-WPB, SUS304-WPA, SUS304-WPB, SUS316-WPA, SUS631J1-WPC, and other stainless steel wires for spring (JIS G 4314). It is done.

The material constituting the elongated body according to the present invention is (a) elastically deformable in nature, and (b) plastic even when an external force from the side (direction perpendicular to the longitudinal direction) is repeatedly applied. A material that satisfies the requirements of (a) to (c), which is difficult to deform (does not sag), and (c) has sufficient strength to transmit sufficient torque to the fastening machine parts. It is desirable to be.
Spring steel (spring stainless steel wire) is relatively inexpensive and easy to procure, so it is preferable as a material constituting the elongated body.
However, even if it is other steel materials etc., it can be made into the material which satisfy | fills the conditions of said (a) thru | or (c) by performing heat processing etc. suitably, Therefore, the long strip which concerns on this invention is used. The constituent material is not limited to spring steel.

The inner restraint member 12 is an embodiment of the inner restraint member according to the present invention.
As shown in FIG. 1 to FIG. 3, the inner restraining member 12 has a plurality of cuts that reach the outer circumferential surface 12b from the accommodating hole 12a through the housing hole 12a and the outer circumferential surface 12b. .. Are divided into a total of 12 pieces 12d, 12d,.

The accommodation hole 12 a is a hole for accommodating the elongated body group 11 and penetrates the inner restraint member 12 vertically.
As shown in FIG. 2, the longitudinal direction of the elongated body group 11 accommodated in a bundled state in the accommodation hole 12a is parallel to the center line 30 of the accommodation hole 12a.
In addition, the elongated body group 11 accommodated in the state of being bundled in the accommodation hole 12 a can slide in the longitudinal direction of the elongated body group 11.

As shown in FIG. 1 and FIG. 2, the elongated body group 11 accommodated in a state of being bundled in the accommodation hole 12 a is composed of elongated bodies 11 a, 11 a, elongated bodies 11 b, 11 b, and elongated bodies. 11c, 11c... And long strips 11d, 11d,... In the order of positions close to the inner peripheral surface of the accommodation hole 12a of the inner restraining member 12 (position away from the center line 30 of the accommodation hole 12a). Be placed.
Moreover, as shown in FIG. 1, the diameter (cross-sectional dimension) of the long strip group 11 is large in order of the long strip 11a, the long strip 11b, the long strip 11c, and the long strip 11d.

The outer peripheral surface 12 b is a surface that forms the outer periphery of the inner restraint member 12. As shown in FIG. 2, the outer peripheral surface 12b is tapered so as to increase in diameter in the longitudinal direction of the accommodation hole 12a, more strictly, from the upper surface to the lower surface of the inner restraint member 12.
As shown in FIGS. 2 and 4, a male screw 12e is formed on the outer peripheral surface 12b.

  The number of small pieces constituting the inner restraint member according to the present invention may be two or more from the viewpoint of securely engaging a plurality of elongated members with a fastening mechanical component (so that sufficient torque can be applied). What is necessary is just to be sufficient, and it is not limited to the structure divided | segmented into a total of 12 pieces 12d * 12d ... like the inner side restraint member 12 of a present Example.

The airbag 13 is an embodiment of the urging member according to the present invention.
As shown in FIG. 2, the elongated body group 11 accommodated in the accommodation hole 12a of the inner restraining member 12 is projected in a direction in which the tip portion protrudes from the lower opening of the accommodation hole 12a (in the case of the present embodiment, FIG. 2 in FIG. 2).

  The airbag 13 of the present embodiment is a rubber bag filled with air, and its outer shape is a substantially cylindrical shape with a short height. On the lower surface of the airbag 13, the base end portion of the elongated body group 11 accommodated in the accommodation hole 12 a of the inner restraining member 12 (the end portion on the opposite side of the distal end portion of the elongated body group 11). Is fixed by means such as adhesion.

  In the case of the present embodiment, in the state where the external force due to the hexagon bolt 2 is not acting on the elongated member group 11, the tip end portion of the elongated member group 11 does not actually protrude from the lower opening of the accommodation hole 12a. The distal end portion of the elongated body group 11 is disposed at substantially the same height as the lower surface of the inner restraining member 12 (the opening below the accommodation hole 12a), and an external force by the hexagon bolt 2 acts on the elongated body group 11. In a state (refer FIG. 7 and FIG. 8), about the thing which the front-end | tip part is contact | abutting the hexagon bolt 2 among the some long strips which comprise the long strip group 11, from the opening part below the accommodation hole 12a. Move to the retracted position.

  The urging member according to the present invention is not limited to the configuration in which the plurality of elongated members are urged by the pressure of the gas sealed inside like the airbag 13 of the present embodiment. Inner restraints such as a configuration in which a plurality of elongated members are urged by the elastic force of the material constituting the urging member, such as a wound spring whose one end is fixed to the base end or a resin sponge molded in a substantially cylindrical shape Other configurations may be possible in which the plurality of elongated bodies accommodated in the member accommodation holes can be biased in the direction in which the distal ends of the plurality of elongated bodies protrude from the openings of the accommodation holes.

The outer restraint member 14 is an embodiment of the outer restraint member according to the present invention.
As shown in FIGS. 2 and 5, the outer restraining member 14 is a substantially ring-shaped member, and the outer restraining member 14 is formed with a fitting hole 14 a penetrating vertically. The inner peripheral surface 14b of the fitting hole 14a is tapered so as to increase in diameter from the upper opening of the fitting hole 14a toward the lower opening corresponding to the outer peripheral surface 12b of the inner restraining member 12.
A female screw 14c is formed on the inner peripheral surface 14b of the fitting hole 14a, and the outer restricting member 14 is screwed into the inner restricting member 12 by engaging the female screw 14c with the male screw 12e.
As a result, the inner restraint member 12 is fitted into the fitting hole 14a of the outer restraint member 14, and the inner peripheral surface 14b of the fit hole 14a of the outer restraint member 14 and the outer peripheral surface 12b of the inner restraint member 12 come into contact with each other.

The support member 15 is an embodiment of the support member according to the present invention.
The support member 15 can slide a total of twelve pieces 12d, 12d,... Constituting the inner restraint member 12 in the radial direction (direction perpendicular to the center line 30) of the accommodation hole 12a of the inner restraint member 12. The long restraint group 11 is supported while supporting the inner restraint member 12 so as not to move in the circumferential direction of the center line of the accommodation hole 12a.

As shown in FIGS. 2 and 6, the support member 15 is a substantially columnar member, and an accommodation recess 15 a is formed at the center of the lower surface thereof. The housing recess 15 a is a recess for housing the airbag 13. The upper surface of the airbag 13 accommodated in the accommodating recess 15a of the support member 15 is fixed to the support member 15 by means such as adhesion.
Accordingly, the elongated body group 11 fixed to the lower surface of the airbag 13 is supported by the support member 15 via the airbag 13 (cannot be detached).

Engagement grooves 15 b, 15 b, etc. reaching the outer peripheral surface of the support member 15 from the housing recess 15 a are formed on the peripheral edge of the lower surface of the support member 15. The shape of the engagement groove 15 b is an opening on the lower surface side of the support member 15 when viewed from the radial direction of the support member 15 (the direction perpendicular to the center line 31 of the support member 15 that coincides with the center line 30 of the inner restraining member 12). It is a substantially T-shape with a narrow part and a wide upper part.
Further, as shown in FIG. 4, an engagement protrusion 12 f extending from the inner peripheral surface of the inner restricting member 12 to the outer peripheral surface 12 b is formed on the upper surface of the small piece 12 d constituting the inner restricting member 12. The engagement protrusion 12f has a substantially T-shaped shape with a narrow base as viewed from the outer peripheral surface 12b and an enlarged upper end, and engages with the engagement groove 15b of the support member 15.
As a result, the small piece 12d engaged with the support member 15 by the engagement groove 15b by the engagement protrusion 12f slides in the longitudinal direction of the engagement groove 15b, that is, in the radial direction of the support member 15 (direction perpendicular to the center line 31). Is possible.

  As shown in FIGS. 1 and 2, the handle portion 20 is an embodiment of the handle according to the present invention, and is a member fixed to the engaging portion 10 (more precisely, the support member 15).

  The handle portion 20 mainly includes a handle body 21 and a ratchet mechanism 22.

  The handle body 21 is a rod-like member, and a ratchet body 22a of the ratchet mechanism 22 is fixed to one end thereof.

The ratchet mechanism 22 has a ratchet body 22a and a ratchet shaft 22b.
The ratchet body 22a is fixed to the handle body 21. The ratchet shaft 22b protrudes from the ratchet body 22a, and the tip end portion of the ratchet shaft 22b is fixed to the support member 15 so as not to be relatively rotatable and detachable.
Accordingly, the handle portion 20 is fixed to the support member 15 via the ratchet mechanism 22.
The center line of the ratchet shaft 22b is perpendicular to the longitudinal direction of the handle body 21, and is aligned with the center line 30 of the inner restraint member 12.

  The ratchet mechanism 22 includes: (i) a state in which the ratchet shaft 22b can rotate forward and cannot rotate reversely with respect to the ratchet body 22a; or (ii) a state in which the ratchet shaft 22b can rotate backward and cannot rotate forward with respect to the ratchet body 22a. It is possible to switch either.

  An operator holds the handle portion 20 in his / her hand, engages the hexagon bolt 2 with the engaging portion 10, and rotates the engaging portion 10 as a center (in a direction in which the ratchet shaft 22b cannot rotate with respect to the ratchet main body 22a). Thus, torque is applied to the hexagon bolt 2 engaged with the engaging portion 10, and the hexagon bolt 2 is tightened.

  Below, the procedure of the fastening operation | work of the hexagon bolt 2 by the fastening tool 1 is demonstrated using FIG.2, FIG.7 and FIG.8.

  As shown in FIG. 2, the outer restraining member 14 is screwed in the vicinity of the upper end portion of the inner restraining member 12 in a state (initial state) before the tightening operation.

  As shown in FIG. 7, the head 2 a of the hexagon bolt 2 is elongated in a state where the center line 30 of the inner restraining member 12 (center line 31 of the support member 15) and the center line 35 of the hexagon bolt 2 are aligned. 11, the long strips 11 a, 11 a, the long strips 11 b, 11 b, the long strips 11 c, 11 c, and the long strips 11 d, 11 d. .. of the long strips 11c, 11c,... And the long strips 11d, 11d, etc., whose tips are in contact with the head 2a of the hexagon bolt 2, are resistant to the urging force of the airbag 13. Then, it slides to a position retracted from the lower opening of the accommodation hole 12a.

  When the outer restraint member 14 is rotated with respect to the inner restraint member 12 about the center line 30 (31) from the state shown in FIG. 7, the outer restraint member 14 is screwed into the inner restraint member 12 as shown in FIG. While moving downward.

As shown in FIG. 8, when the outer restraint member 14 moves downward while being screwed to the inner restraint member 12, the outer peripheral surface 12 b of the inner restraint member 12 expands from the upper surface to the lower surface of the inner restraint member 12. Since the taper is tapered, the small pieces 12d, 12d,... Constituting the inner restraining member 12 slide in the direction approaching the center line 30 while engaging with the support member 15, and the inner restraining member 12 has the accommodating hole 12a. The diameter becomes smaller.
Note that the cut 12c (see FIG. 3) between the adjacent small pieces 12d and 12d has a certain gap, and even if the small piece 12d slides in the direction approaching the center line 30, the adjacent small pieces 12d are not. There is no contact (it does not interfere with the other small piece 12d to prevent sliding in the direction approaching the center line 30).

As shown in FIG. 8, the small pieces 12 d, 12 d... Constituting the inner restraint member 12 slide in the direction approaching the center line 30 while engaging the support member 15, and the diameter of the accommodation hole 12 a of the inner restraint member 12. Becomes smaller, the long strips 11a, 11a,..., The long strips 11b, 11b,. The strips 11d, 11d,.
As a result, the long strips 11a, 11a ..., the long strips 11b, 11b ..., the long strips 11c, 11c ... and the long strips 11d, 11d ... Among them, the long strips 11 a, 11 a... And the long strips 11 b, 11 b. 11b ...) is in contact with the side surface (engagement surface) of the head portion 2a of the hexagon bolt 2, and the side surface of the head portion 2a of the hexagon bolt 2 and the elongated body group 11 are compared with the state shown in FIG. There is almost no gap between them.
Further, the head 2a of the hexagon bolt 2 between the inner peripheral surface of the accommodation hole 12a and the long strips (mainly the long strips 11a, 11a...) Contacting the inner peripheral surface, between the adjacent long strips. A large frictional force is generated between the side surface of the material and the elongated body (mainly the elongated body 11b, 11b...) That contacts the side surface.
In this way, the engaging portion 10 is firmly engaged with the hexagon bolt 2.

  When the operator holds the handle body 21 and rotates the handle body 21 around the center line 30 (center line 31) in the state shown in FIG. 8, the engaging portion 10 is firmly engaged with the hexagon bolt 2. Therefore, sufficient torque is applied to the hexagon bolt 2 and the hexagon bolt 2 is tightened.

As described above, the tightening tool 1 is
A tightening tool for tightening a hexagon bolt 2 which is an embodiment of a fastening machine part,
Long strips 11 (long strips 11a, 11a ..., long strips 11b, 11b ..., long strips 11c, 11c ... and long strips 11d, 11d ...),
The long hole group 11 is bundled to have a holding hole 12a for receiving the long hole group 11 so as to be slidable in the longitudinal direction, and an outer peripheral surface 12b tapered in the longitudinal direction of the receiving hole 12a. The inner restraint member 12 divided into a total of 12 small pieces 12d, 12d, and so on by a total of 12 cuts 12c, 12c, and so on.
An airbag 13 that urges the elongated body group 11 accommodated in the accommodation hole 12a of the inner restraint member 12 in a direction in which the distal end portion of the elongated body group 11 protrudes from the opening of the accommodation hole 12a;
A fitting hole 14 a having a tapered inner peripheral surface 14 b corresponding to the outer peripheral surface 12 b of the inner restraining member 12 is formed, and the inner peripheral surface 14 b of the fitting hole 14 a and the outer peripheral surface 12 b of the inner restricting member 12 come into contact with each other. The outer restraint member 14 for fitting the inner restraint member 12 into the fitting hole 14a,
It comprises.
With this configuration, the outer dimension of the head 2a, which is the part of the hexagon bolt 2 that is engaged with the tightening tool 1, changes, or the outer shape of the head 2a changes (for example, the hexagon bolt 2 Even when the shape of the head 2a is changed from a hexagon to a quadrangle when viewed from the longitudinal direction of the center line 35), the engaging portion 10 is firmly engaged with the head 2a of the hexagon bolt 2. Therefore, it is possible to tighten the hexagon bolt 2 by applying a sufficient torque.

Further, the long strips 11a, 11a,..., The long strips 11c, 11c,. ..., the cross-sectional dimension becomes larger as the position accommodated in the accommodating hole 12a is farther from the center line 30 of the accommodating hole 12a (the sectional dimension of the elongated member 11a> the sectional dimension of the elongated member 11b> the elongated member 11c. <Cross-sectional dimension> cross-sectional dimension of the elongated body 11d).
This configuration has the following advantages.
That is, in general, as the diameter (cross-sectional dimension) of a fastening machine part such as a bolt increases, the torque required for fastening increases, but the diameter of the fastening machine part, and hence the fastening tool in the fastening machine part, increases. As the diameter of the engaging portion increases, the diameter (cross-sectional dimension) of the elongated member contacting the engaging portion with the fastening tool in the fastening machine part also increases, and the engaging portion with the fastening tool in the fastening machine component The strength of the elongated body that comes into contact with is improved.
As a result, it is possible to apply a larger torque during tightening as the cross-sectional dimension of the fastening machine part increases.
It should be noted that the cross-sectional dimension of the elongated member contacting the engagement surface with the fastening tool in the fastening machine part such as a bolt (in this embodiment, the side surface of the head 2a of the hexagon bolt 2) is as large as possible. While the strength is improved, if the cross-sectional dimension of the elongated member is excessive, the gap between the engagement portion with the tightening tool and the elongated member that comes in contact with it becomes large, and it is difficult to transmit sufficient torque. Become.
Therefore, the cross-sectional dimension of the elongated member contacting the engagement surface with the fastening tool in the fastening machine part such as a bolt is less than half of the width of the engagement surface in the fastening machine part (at least two long lengths). It is preferable to make it as large as possible within a range that satisfies the condition that the strip is in contact with the engagement surface of the fastening machine component.

Further, the elongated body group 11 of the tightening tool 1 is made of spring steel.
By configuring in this way, the elongated body group 11 can be elastically deformed, and even when an external force from the side (direction perpendicular to the longitudinal direction) is repeatedly applied, it is difficult to be plastically deformed, and to the fastening machine part It is possible to have a strength that can transmit a sufficient torque.

The tightening tool 1 is
A male screw 12e is formed on the outer peripheral surface 12b of the inner restricting member 12, and a female screw 14c is formed on the inner peripheral surface 14b of the fitting hole 14a of the outer restricting member 14. The outer restricting member 14 is screwed onto the inner restricting member 12. To match.
With this configuration, the diameter of the accommodation hole 14a of the inner restraining member 12 can be easily changed by simply rotating the outer restraining member 14 with respect to the inner restraining member 12 (as a result, it is included in the long strip group 11). It is possible to firmly restrain the long strips by bringing them into contact with each other.
In this embodiment, the outer restraint member 14 is screwed into the inner restraint member 12 to change the diameter of the accommodation hole 14a of the inner restraint member 12, but the present invention is not limited to this. First, the outer restraint member is moved in the longitudinal direction of the accommodation hole of the inner restraint member by another method to reduce the diameter of the accommodation hole, thereby bringing the elongated bodies into contact with each other and firmly restraining them, In this state, the same effect can be obtained even if the outer restraint member is fixed to the inner restraint member so as not to move relative to the inner restraint member.

The tightening tool 1 is
Each of the twelve small pieces 12d, 12d,... Constituting the inner restraint member 12 is slidable in the radial direction (direction perpendicular to the center line 30) of the accommodation hole 12a of the inner restraint member 12, and the inner restraint member 12 is slidable. The support member 15 is supported so as to be immovable in the circumferential direction of the center line of the housing hole 12 a and to support the elongated body group 11.
By configuring in this way, it is possible to hold a total of twelve pieces 12d, 12d,... Constituting the inner restraining member 12 at a position surrounding the long strip group 11, and the long strip group 11. Can be held in a state of being accommodated in the accommodation hole 12a of the inner restraint member 12 (so that it cannot be dropped off).

The tightening tool 1 is
A handle portion 20 fixed to the support member 15 is provided.
With this configuration, the operator can easily apply torque for tightening the hexagon bolt 2 by rotating the tightening tool 1 while holding the handle portion 20.

Further, the handle portion 20 (handle body 21) of the tightening tool 1 is fixed to the support member 15 via the ratchet mechanism 22.
With this configuration, when the hexagon bolt 2 is tightened, the engaging portion 10 of the tightening tool 1 is once detached from the head 2a of the hexagon bolt 2 every time the handle portion 20 is rotated by a predetermined rotation angle. There is no need to perform the operation of engaging the head 2a of the hexagon bolt 2 and the workability is excellent.

In addition, as shown in FIG. 9, the inner surface of the accommodation hole 12a of the inner restraint member 12 is opposed to the inner circumference of the accommodation hole 12a of the inner restraint member 12 in the elongated body group 11 (the elongated body 11a). ... 11a...
With this configuration, the elongated body group 11 is arranged around the center line 30 of the inner restraining member 12 at the contact portion between the inner circumferential surface of the accommodation hole 12 a of the inner restraining member 12 and the elongated body group 11. It is possible to prevent slipping in the direction, and it is possible to apply a larger torque to the hexagon bolt 2 at the time of tightening.

The bottom view which shows one Embodiment of the clamping tool which concerns on this invention. Side surface sectional drawing which shows one Embodiment of the clamping tool which concerns on this invention. The bottom view of the inner side restraint member in one Embodiment of the fastening tool which concerns on this invention. The perspective view of the small piece in one Embodiment of the clamping tool which concerns on this invention. The bottom view of the outer side restraint member in one Embodiment of the clamping tool which concerns on this invention. The figure which shows the supporting member in one Embodiment of the clamping tool which concerns on this invention. Side surface sectional drawing which shows the state which pressed one Embodiment of the clamping tool which concerns on this invention on the volt | bolt. Side surface sectional drawing which shows the state which engaged one Embodiment of the clamping tool which concerns on this invention with the volt | bolt. The bottom view which shows another Example of the inner side restraint member in the clamping tool which concerns on this invention.

Explanation of symbols

1 Tightening tool 2 Hexagon bolt (mechanical part for fastening)
2a head 11 long strip group 11a long strip 11b long strip 11c long strip 11d long strip 12 inner restraint member 12a receiving hole 12b outer peripheral surface 12c cut surface 12d small piece 13 airbag (biasing member)
14 Outer restraint member 14a Fitting hole 14b Inner peripheral surface

Claims (9)

A tightening tool for tightening mechanical parts for fastening,
Multiple elongated bodies;
A plurality of slits having a housing hole for bundling the plurality of elongated bodies and slidably housing in the longitudinal direction and an outer peripheral surface tapered in the longitudinal direction of the housing hole and reaching the outer circumferential surface from the housing hole An inner restraint member divided into a plurality of small pieces by
An urging member that urges the plurality of elongated bodies accommodated in the accommodation holes of the inner restraining member in a direction in which the tip ends project from the opening of the accommodation hole;
A fitting hole having a tapered inner peripheral surface corresponding to the outer peripheral surface of the inner constraining member is formed, and the inner constraining member is in contact with the inner peripheral surface of the fitting hole and the outer peripheral surface of the inner constraining member. An outer restraining member for fitting the member into the fitting hole;
A tightening tool comprising: The plurality of elongated bodies are:
The tightening tool according to claim 1, wherein the cross-sectional dimension increases as the position accommodated in the accommodation hole moves away from the center line of the accommodation hole. The plurality of elongated bodies are:
The fastening tool according to claim 2, wherein the cross-sectional dimension is less than one half of the width of the engagement surface in the fastening machine part.   The fastening tool according to any one of claims 1 to 3, wherein the plurality of elongated bodies are made of spring steel.   2. A male screw is formed on the outer peripheral surface of the inner restraining member, a female screw is formed on the inner peripheral surface of the fitting hole of the outer restraining member, and the outer restraining member is screwed into the inner restraining member. The fastening tool according to any one of claims 1 to 4.   The locking groove which locks what is opposed to the inner peripheral surface of the accommodation hole among a plurality of above-mentioned long strips is formed in the inner peripheral surface of the accommodation hole of the inner restraint member. The tightening tool according to any one of the above.   Each of the plurality of small pieces constituting the inner restraint member is supported so as to be slidable in the radial direction of the accommodation hole of the inner restraint member and immovable in the circumferential direction of the center line of the accommodation hole, and the plurality of elongated bodies. The tightening tool according to any one of claims 1 to 6, further comprising a support member that supports the shaft.   The tightening tool according to claim 7, further comprising a handle fixed to the support member.   The tightening tool according to claim 8, wherein the handle is fixed to the support member via a ratchet mechanism.

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