JP2004237420A - Tool holding device and support shaft used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow common use of a tool holding device, whether the center deviation of a rotation axis such as a work machine outputting rotational drive force (including the case of manual driving) and the axis of a tool (such as a bolt or a nut rotated by the tool) occurs, so as to expand versatility and eliminate troubles (heighten workability). <P>SOLUTION: The device has a working head 3 having the tool 7 at a tip end and a support shaft 4 connected to a root side of the working head 3. With respect to a connecting part of the working head 3 and the support shaft 4, when the working head 3 is plunged into a support shaft 4 side, the working head and the support shaft can be rotated together and fixed in an axial direction. When the working head 3 is pulled out of the support shaft 4 side by the predetermined quantity, the working head and the support shaft are rotated together, and a joint structure 5 making the working head 3 swingable is provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tool holding device and a support shaft used for the same.
[0002]
[Prior art]
2. Description of the Related Art A universal joint type bolt fastening tool used when a bolt is located in a place where a hexagon wrench is difficult to enter when tightening or loosening a bolt with a hexagon wrench is known (see Patent Document 1).
In this bolt fastening tool, a shaft as an intermediate member is interposed between two members, a shank portion for attaching to a drive actuator (a working machine that outputs a rotational driving force) and a portion having a hexagon wrench. Universal joints (ball joints) are provided at two places, between the connection with the shaft and between the connection with the portion having the hexagon wrench.
[0003]
It is stated that if this bolt fastening tool is used, the hexagon wrench can be rotationally driven by the drive actuator while the rotational axis of the drive actuator and the axis of the hexagon wrench are misaligned.
The two universal joints employed in the bolt fastening tool are not sufficient to simply allow the joint to swing at the joint, and must always maintain the integral rotation at the joint. Therefore, instead of a perfect spherical pair, it is a combination of a ball-shaped projection with a hexagonal cross section that is bulged like a drum and a socket part with a projection receiving recess with a hexagonal opening that can be fitted externally. I have.
[0004]
[Patent Document 1]
Published Japanese Utility Model Application No. 6-5830
[Problems to be solved by the invention]
In the above-mentioned conventional bolt fastening tool, the universal joints provided at two locations are always in a swingable state. That is, the entire length from the shank portion to the portion having the hexagon wrench via the shaft is in a state of being bent into a so-called gunyagunya.
For this reason, even when the bolt to be tightened or loosened is located at a place where the hexagon wrench is easy to enter, the state of the gunyagunya appears. Therefore, work may be difficult.
[0006]
The present invention has been made in view of the above circumstances, and has a rotating shaft center (including a case of manual turning) of a working machine or the like that outputs a rotational driving force and a tool (for example, a bolt or a nut rotated by the tool). Regardless of whether the center of the shaft is misaligned or not, it can be used in common, expands its versatility in use, and can eliminate troublesome use. It is an object of the present invention to provide a tool holding device (which can improve workability) and a support shaft used in this type of tool holding device.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following measures.
That is, the tool holding device 1 according to the present invention has the work head 3 provided with the tool 7 at the tip, and the support shaft 4 connected to the root side of the work head 3.
Here, the tool 7 includes not only a hexagon wrench but also a box wrench (box spanner), a Phillips or flathead screwdriver, other bits, and a chuck that enables replacement of these drivers, bits, drills, and the like. Shall be included.
[0008]
When the work head 3 is pushed into the support shaft 4 side, the work head 3 and the support shaft 4 can be integrally rotated and integrated in the axial direction (the swing of the work head 3 is prevented). A joint structure 5 is provided so that when the work head 3 is pulled out from the support shaft 4 by a predetermined amount, the work head 3 can be swung while the two can be rotated together. Have been.
Therefore, in the tool holding device 1, the support shaft 4 and the work head 3 are pushed or pulled out along the connecting direction thereof, thereby enabling or disabling or switching the swing of the work head 3. Things.
[0009]
By this switching, the center of rotation of the working machine 2 or the like (including the case of manual turning) that outputs the rotational driving force and the center of the tool 7 (for example, a bolt 8 or a nut rotated by the tool 7) are aligned with the center. Irrespective of whether the position is shifted or the center is not shifted, it is possible to properly use them.
Such a joint structure 5 allows, for example, the lens-shaped protrusion 10 provided on one of the working head 3 or the support shaft 4 and the lens-shaped protrusion 10 to be fitted to the other side of the work head 3 or the support shaft 4. And a socket portion 11 provided with a projection receiving recess 21 to be provided.
[0010]
In this joint structure 5, it is assumed that one of the working head 3 and the support shaft 4 is provided with a round step 13 projecting toward the other party. On the other hand, the other end of the working head 3 or the support shaft 4 is provided with a round recess 30 that enables the round step portion 13 to be fitted without looseness when the work head 3 is pushed into the support shaft 4 side. It shall be provided.
In this way, the state where the work head 3 is pushed into the support shaft 4 side, that is, the state where the support shaft 4 and the work head 3 are integrally rotatable and fixed integrally in the axial direction (the neck of the work head 3). (A state in which the swing is prevented) can be surely held.
[0011]
Therefore, in use in this state, the connection between the support shaft 4 and the work head 3 is not unintentionally swung (unsteady), and inconvenience in use is avoided. You can do it.
The joint structure 5 has a structure in which a round step portion 13 is provided on one of the working head 3 or the support shaft 4 and a round concave portion 30 is provided on the other, as follows. You can also.
That is, it is assumed that one of the working head 3 and the support shaft 4 is provided with the abutting shoulder 32 facing the other party. On the other hand, the other end of the working head 3 or the support shaft 4 is provided with a contact stop surface 33 which can be in line contact with the contact shoulder 32 when the work head 3 is pushed toward the support shaft 4 side. It is assumed that
[0012]
Even in this case, the state in which the work head 3 is pushed toward the support shaft 4 (the state in which the work head 3 is prevented from swinging) can be reliably held.
Note that the support shaft 4 itself that can be used in these tool holding devices 1 is also supposed to be used alone according to the present invention.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a situation in which the first embodiment of the tool holding device 1 according to the present invention is used by attaching it to a working machine 2 (for example, an electric screwdriver or an electric drill) that outputs a rotational driving force. FIG. 2 shows another use situation of the same tool holding device 1.
In the tool holding device 1, a working head 3 and a support shaft 4 are connected via a joint structure 5.
[0014]
The working head 3 is a portion where a tool 7 such as a box wrench is provided at the tip.
The tool 7 may be provided integrally with the work head 3 or may be provided separately (the example shown is a case provided integrally, and has a hexagonal head. It is a box wrench for fastening or loosening the bolts 8 and nuts).
The support shaft 4 is connected to the work head 3 so as to protrude on the opposite side (root side) of the work head 3 from which the tool 7 is provided. In the first embodiment, the shank for attaching the tool holding device 1 to the work machine 2 is formed.
[0015]
When the work head 3 is pushed into the support shaft 4 side, the joint structure 5 of the tool holding device 1 can be integrally rotated so as to be integrally fixed in the axial direction (the state shown in FIG. 1). Is pulled out from the support shaft 4 by a predetermined amount, the work head 3 can be swung freely while the two can be rotated together (the state of FIG. 2).
FIG. 3 is an enlarged view of the joint structure 5 in the state of FIG. 1, and FIG. 4 is an enlarged view of the joint structure 5 in the state of FIG.
[0016]
As is clear from FIGS. 3 and 4, the joint structure 5 is a combination of the lens-shaped projection 10 and the socket portion 11 by fitting.
In the first embodiment, the lens-shaped projection 10 is provided on the support shaft 4, and the socket 11 is provided on the working head 3.
As shown in FIG. 5 and FIG. 6, the lens-shaped projection 10 is bulged in the shape of a drum. The cross-sectional shape is a regular hexagon.
At the base of the lens-shaped projection 10, there is provided a round step 13 formed thicker than the shaft main body 12 of the support shaft 4. The round step 13 is in a state of protruding from the support shaft 4 side toward the work head 3 side. Once the neck portion 14 is provided from the round step 13 to the neck portion 14 having a thickness substantially the same as that of the shaft main body 12, the above-described lens-shaped projection 10 is provided at the tip of the neck portion 14. It has become.
[0017]
The neck portion 14 is formed in a hexagonal cross section similarly to the lens-shaped projection 10.
On the other hand, the round step 13 is literally formed in a round cross section as is apparent from FIG. Note that the shape may be a perfect circle, but may be another round shape (a somewhat elliptical shape, a circular shape having serrations, grooves, or the like on its outer peripheral surface).
A positioning ball 15 is provided on the outer surface of the lens-shaped projection 10.
As shown in FIG. 7, the positioning ball 15 is a ball provided so as to penetrate in a radial direction perpendicular to the connecting direction (the vertical direction in FIG. 7) between the working head 3 and the support shaft 4. It is movably fitted into the hole 17. A coil spring 18 is packed in the ball hole 17 in an axially compressed state, and is pushed by a blind plug 19.
[0018]
Accordingly, the positioning ball 15 is urged to be pushed radially outward (leftward in FIG. 7) of the lens-shaped projection 10. The positioning ball 15 is prevented from coming off by fitting the lens-shaped projection 10 into the socket portion 11.
On the other hand, the socket portion 11 has a projection receiving recess 21 that allows the lens-shaped projection 10 to be fitted outside.
As shown in FIG. 8, in the first embodiment, the projection receiving concave portion 21 has a hexagonal opening shape. The projection receiving concave portion 21 can axially move the lens-shaped projection 10 between a swing position (the state shown in FIG. 4) and a straight fixing position (the state shown in FIG. 3) from the opening end side toward the back. It is formed as deep as possible.
[0019]
That is, in a state in which the lens-shaped projection 10 is fitted in the projection-receiving concave portion 21, the lens-shaped projection 10 is axially movable. It is a position for
The projection receiving recess 21 is provided with a round recess 30. The round recess 30 is positioned corresponding to the opening end of the projection receiving recess 21. Further, the size is such that the root round step 13 of the lens-shaped projection 10 can be fitted without looseness.
[0020]
Therefore, when the work head 3 is pushed toward the support shaft 4, the round step 13 is fitted into the round recess 30.
Since the swing position in the projection receiving recess 21 is positioned closer to the opening of the projection receiving recess 21, only the lens-shaped projection 10 is fitted, and the round step 13 is fitted in the round recess 30. There is no state.
For this reason, the lens-shaped projection 10 is formed in an intermediately bulging shape with the neck portion 14, so that the spherical projection centering on the lens-shaped projection 10 is in an evenly fitted state, whereby swinging is allowed. Will be done.
[0021]
Further, since the straight fixing position in the projection receiving recess 21 is located at a position closer to the back of the projection receiving recess 21, the round step 13 is fitted into the round recess 30, and this lens-shaped projection 10 is fitted. Is not allowed to swing.
As described above, the lens-shaped projection 10 has a hexagonal cross section, and the projection receiving recess 21 of the socket portion 11 has a hexagonal opening. Irrespective of whether it is in the swinging position or the straight fixing position, the engaging portions are formed at least at six places in the circumferential direction.
[0022]
That is, the lens-shaped projection 10 and the socket portion 11 are always kept in a detent relationship, and as a result, the support shaft 4 and the working head 3 always rotate integrally.
In such a projection receiving recess 21, a circumferential groove 23 is provided at a position defining the round recess 30 in the depth direction. After the lens-shaped projection 10 has been fitted into the projection receiving recess 21, a retaining member 24 such as a retaining ring is fitted into the peripheral groove 23.
Therefore, in the projection receiving recess 21, the lens-shaped projection 10 is limited to axial movement within a range in which the neck portion 14 can pass through the inside of the retaining member 24 (ie, the length of the neck portion 14). The lens-shaped projection 10 does not escape from the inside.
[0023]
A positioning recess 25 is provided in the projection receiving recess 21 of the socket portion 11 so that the positioning ball 15 provided on the lens projection 10 can be engaged when the lens projection 10 is in the straight fixing position. ing.
The positioning recesses 25 need only be provided at one location. However, a plurality of positioning recesses 25 may be provided in the circumferential direction in the projection receiving recess 21 (see FIG. 4), or they may be formed as circumferential grooves in the projection receiving recess 21. May be.
Since the positioning ball 15 is provided on the lens-shaped protrusion 10 and the positioning recess 25 is provided in the protrusion-receiving recess 21 of the socket portion 11 when the lens-shaped protrusion 10 is at the straight fixing position, 15 engages with the positioning recess 25, and this state is maintained by the spring force of the coil spring 18.
[0024]
Therefore, the state in which the work head 3 is pushed into the support shaft 4 side, that is, the state in which the support shaft 4 and the work head 3 are integrally rotatable and fixed in the axial direction (a state in which the head swing is prevented) is eager. Unless the work head 3 is pulled out from the support shaft 4 side, the work head 3 is held.
As a result, in use in this state, the connection between the support shaft 4 and the work head 3 is unintentionally swung (unsteady), and inconvenience in use is eliminated. It can be avoided.
[0025]
As is apparent from the above description, in the tool holding device 1 according to the present invention, the support shaft 4 and the working head 3 are pushed or pulled out along the connecting direction thereof, thereby swinging the working head 3. Can be enabled or disabled or switched.
Therefore, the position of the bolt 8 or the like to be rotated by the tool 7 may be at a position where the rotation axis of the work machine 2 and the axis of the tool 7 must be misaligned, or at a position where the misalignment is not required. Regardless of whether or not they can be used properly.
[0026]
9 to 12 show a second embodiment of the tool holding device 1 according to the present invention.
The most different point of the tool holding device 1 of the second embodiment from the first embodiment is that the abutting shoulder 32 is provided for one of the working head 3 and the support shaft 4 and that the working head 3 or the support shaft 4 is provided with a contact stop surface 33.
In the second embodiment, the support shaft 4 is provided with the abutting shoulder 32, and the working head 3 is provided with the abutment surface 33.
[0027]
In the second embodiment, the support shaft 4 is provided with the lens-shaped projection 10 and the working head 3 is provided with the socket 11.
Therefore, the abutting shoulder 32 is provided on the support shaft 4 side and at the root of the lens-shaped projection 10. The diameter of the lens projection 10 is larger than that of the lens projection 10.
In the illustrated example, a short cylindrical base 35 is provided for the lens projection 10, and a peripheral edge of the base 35 near the lens projection 10 is an abutting shoulder 32.
[0028]
On the other hand, the contact stop surface 33 is provided on the working head 3 side and at the opening end of the projection receiving concave portion 21 in the socket portion 11. When the work head 3 is pushed toward the support shaft 4, the work head 3 is in line contact with the abutting shoulder 32 of the lens-shaped projection 10.
In the illustrated example, the abutment surface 33 has a tapered hole whose diameter gradually decreases toward the back of the projection receiving recess 21. Therefore, a line contact state with the butting shoulder 32 of the lens-shaped projection 10 over the entire circumference is obtained.
[0029]
However, it is not limited to obtain such an all-around line contact state, and a dotted line contact state may be used.
In addition, the lens-shaped projection 10 in the illustrated example has a square cross section, and therefore, naturally, the opening shape of the projection receiving recess 21 in the socket portion 11 also has a square shape.
Further, in the second embodiment, the support shaft 4 has a structure in which the shaft main body 12 is press-fitted into the press-fitting hole 50 provided in the base 35. However, the support shaft 4 may have a screwed structure, or the base 35 and the shaft main body 12 may be integrated. It is also possible to have a structure.
[0030]
As shown in FIG. 13, the neck portion 14 of the support shaft 4, which is once narrowed from the round step 13 toward the lens-shaped projection 10, has a round cross section similarly to the round step 13. (Circular or the like) can also be formed.
As shown in FIG. 14, in the support shaft 4, a ball hole 17 formed for providing the positioning ball 15 on the outer surface of the lens-shaped projection 10 is provided in a connecting direction between the working head 3 and the support shaft 4 (the vertical direction in FIG. 14). ) May be formed as a blind hole that does not penetrate along the radial direction perpendicular to the direction of ()).
[0031]
In order to prevent the positioning ball 15 from coming out of the ball hole 17, caulking processing is performed at one or a plurality of positions at the opening edge of the ball hole 17 (the portion indicated by the arrow P is inserted into the ball hole 17). May be applied. This is the same when the structure shown in FIG. 7 is adopted.
By the way, the present invention is not limited to the above embodiments, and can be appropriately changed according to the embodiments.
For example, the lens projection 10 may be provided on the working head 3 and the socket 11 may be provided on the support shaft 4.
[0032]
Each of the lens-shaped projections 10 may be chamfered to some extent at each of six ridges forming a hexagonal cross section.
Further, the cross-sectional shape of the lens-shaped protrusion 10 and the opening shape of the protrusion receiving recess 21 in the socket portion 11 can be various shapes (shapes other than the rotating body) such as a quadrangle other than a hexagon.
It has already been described that the work head 3 may be provided integrally with the tool 7 or may be detachable separately. In the illustrated example, the working head 3 is hollow to reduce the weight, but may be solid.
[0033]
The working machine 2 using the tool holding device 1 is not limited at all. For example, it may be a work robot installed in a production line or the like, or a hand-operated instrument. Therefore, the shape, structure, and the like of the shaft main body 12 in the support shaft 4 can be appropriately changed according to those circumstances.
The positioning ball 15 is not limited to a spherical shape.
There is a fitting relationship between the socket portion 11 and the lens-shaped projection 10 (regardless of which is on the working head 3 side or the support shaft 4 side), and the socket portion 11 is necessarily provided with the retaining member 24. No need. That is, the retaining member 24 may not be provided.
[0034]
In this case, if the work head 3 is pulled out strongly from the support shaft 4, the support shaft 4 and the work head 4 can be separated from each other, and one of them can be replaced with a new one or a different one. Becomes possible.
That is, the work head 3 and the support shaft 4 are separately handled as being distributed in the market.
[0035]
【The invention's effect】
As is apparent from the above description, in the tool holding device according to the present invention and the supporting shaft used for the same, the rotating shaft center (including the case of manual turning) of the working machine or the like that outputs the rotational driving force and the tool (this tool) Irrespective of whether the center of the shaft (for example, bolts and nuts, etc., which is rotated in the center) is misaligned or not. Is spreading.
Therefore, troublesome use can be eliminated (operability can be improved).
[Brief description of the drawings]
FIG. 1 is a partially crushed side view showing a situation (under a situation where there is no misalignment) in which a tool holding device according to a first embodiment of the present invention is used while being attached to a work machine.
FIG. 2 is a partially crushed side view showing another use condition (under a misaligned condition) by the tool holding device shown in FIG. 1;
FIG. 3 is an enlarged side sectional view of a joint structure in the state of FIG. 1;
FIG. 4 is an enlarged side sectional view showing a joint structure in the state of FIG. 2;
FIG. 5 is a view showing the support shaft viewed from three sides, that is, from the side surface and from both sides in the axial direction.
FIG. 6 is a view taken along line CC of FIG. 5;
FIG. 7 is an enlarged sectional view showing a mounting structure of a positioning ball provided on a support shaft.
FIG. 8 is a view taken along line DD in FIG. 1;
FIG. 9 is a partially crushed side view showing a main part of a second embodiment of the tool holding device according to the present invention.
FIG. 10 is a side view showing a lens-shaped projection used in the second embodiment.
FIG. 11 is a view taken along line EE of FIG. 10;
12 is a partially crushed side view shown in the same direction as FIG. 10 in the direction of arrows FF in FIG. 11;
FIG. 13 is a side view showing another embodiment of the support shaft.
FIG. 14 is a side sectional view showing another example of the structure for attaching the positioning ball to the support shaft.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tool holding device 2 Work machine 3 Work head 4 Support shaft 5 Joint structure 7 Tool 13 Round step 21 Projection receiving recess 30 Round recess 32 Butting shoulder 33 Stopping surface

Claims (4)

A work head (3) provided with a tool (7) at a tip thereof, and a support shaft (4) connected to a root side of the work head (3);
When the work head (3) is pushed toward the support shaft (4) side with respect to the connecting portion between the work head (3) and the support shaft (4), the work head (3) and the support shaft (4) are integrally fixed in the axial direction while being able to rotate together. When the work head (3) is pulled out from the support shaft (4) side by a predetermined amount, the tool holding device provided with a joint structure (5) that allows the work head (3) to swing freely while allowing both to rotate integrally.
In the joint structure (5), one of the work head (3) and the support shaft (4) is provided with a round step (13) projecting toward the other side, and the work head (3) or the support shaft ( The other side of 4) is provided with a round concave portion (30) which enables the round step portion (13) to be fitted without looseness when the work head (3) is pushed toward the support shaft (4). A tool holding device. A work head (3) provided with a tool (7) at a tip thereof, and a support shaft (4) connected to a root side of the work head (3);
When the work head (3) is pushed toward the support shaft (4) side with respect to the connecting portion between the work head (3) and the support shaft (4), the work head (3) and the support shaft (4) are integrally fixed in the axial direction while being able to rotate together. When the work head (3) is pulled out from the support shaft (4) side by a predetermined amount, the tool holding device provided with a joint structure (5) that allows the work head (3) to swing freely while allowing both to rotate integrally.
In the joint structure (5), one of the working head (3) and the support shaft (4) is provided with an abutting shoulder (32) facing the other party, and the working head (3) or the support shaft (4) is provided. ) Is provided with an abutment surface (33) capable of making line contact with the abutment shoulder (32) when the work head (3) is pushed toward the support shaft (4). A tool holding device. The work head (3), which is provided with a tool (7) at its tip, is connected to the root side thereof, so that when the work head (3) is pushed in, the work head (3) can be rotated integrally and fixed axially integrally. A support shaft (4) capable of forming a joint structure (5) that allows the work head (3) to swing integrally and to swing freely when the work head (3) is pulled out by a predetermined amount;
When the work head (3) is pushed into the support shaft (4) side, the work head (3) is provided with a round step (13) that can be fitted without looseness into a round recess (30) provided on the work head (3) side. A support shaft used for a tool holding device, which is provided so as to protrude toward 3). The work head (3), which is provided with a tool (7) at its tip, is connected to the root side thereof, so that when the work head (3) is pushed in, the work head (3) can be rotated integrally and fixed axially integrally. A support shaft (4) capable of forming a joint structure (5) that allows the work head (3) to swing integrally and to swing freely when the work head (3) is pulled out by a predetermined amount;
When the work head (3) is pushed into the support shaft (4) side, an abutment shoulder (32) capable of making a line contact with the abutment surface (33) provided on the work head (3) side is used. A) a support shaft used in a tool holding device, which is provided facing the surface of the support shaft.

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