JP3621575B2 - Socket for tightening different diameter fasteners - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tightening socket applicable to a plurality of types of fastening members having different diameters when fastening members such as bolts and nuts are fastened.
[0002]
[Prior art]
Conventionally, for example, an outer socket having a fitting hole with a polygonal cross section is fitted to an inner socket having a fitting hole of a slightly smaller size than that, and moved relatively along the axial direction. A socket for tightening different-diameter fastening members is known, in which one socket is advanced and a plurality of types of bolts, nuts, and other fastening member heads, etc. having different diameters are fitted and tightened. When there is no difference in diameter between the fitting hole of the outer socket and the fitting hole of the inner socket, the thickness of the inner socket becomes thinner, and the inner socket becomes thinner and is moved relative to the outer socket due to damage or deformation during tightening. Can no longer do. In order to prevent such problems, for example, a technique as disclosed in Japanese Patent Laid-Open No. 8-257927 has been proposed.
[0003]
In this technology, an inner socket (second screw contact member) is mounted in the engagement hole of the outer socket (first screw contact member) so as to be movable back and forth in the axial direction, and the large diameter of the polygonal head When fitting small diameter bolts, etc. into the respective engagement holes, the engagement holes are engaged with all the surfaces of the polygonal head, such as bolts, so that they are not part of the surface of the head. By fitting so as to be engaged, the thickness of the inner socket in the portion that substantially contacts the engaging surface is increased to ensure the necessary strength.
[0004]
[Problems to be solved by the invention]
However, the above-described technology has a problem that the structure of the socket is complicated, and both the outer socket and the inner socket have to be processed, so that manufacturing costs and labor are required.
[0005]
Therefore, the present invention is particularly suitable for tightening different-diameter fastening members having a small difference in diameter while securing the strength at the time of tightening, making the socket simple and inexpensive, and making maximum use of existing equipment and the like. The purpose is to provide sockets.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention according to claim 1, further comprising: an outer socket having a fitting hole having a polygonal section in cross section; and an outer portion having substantially the same sectional shape as the fitting hole of the outer socket. An inner socket having a fitting hole having a similar cross-sectional shape that is slightly smaller than the outer shape portion can be relatively moved in the axial direction, and a plurality of different diameters can be obtained by relatively advancing the socket on either side. A fastening socket adapted to be fitted to a fastening member, wherein the fitting hole having a polygonal cross section formed inside the inner socket has a vertex of the polygon of the outer portion of the socket. The wall thickness in the direction toward the axial center out of the directions orthogonal to the axial direction at the apex of the polygon of the outer shape of the inner socket is increased. did.
[0007]
When fastening a large-diameter fastening member, use the fitting hole of the outer socket, and when fastening a small-diameter fastening member, use the fitting hole of the inner socket. When the difference approaches, if the polygon of the fitting hole of the inner socket is formed by matching the phase of the polygon of the outer portion, the wall thickness is formed thinly and uniformly.
On the other hand, the force applied to the fitting hole at the time of tightening is not concentrated uniformly on the entire inner surface by the fitting gap, but is concentrated particularly on a portion that contacts the top of the polygonal cross section of the fastening member.
For this reason, by shifting the phase of the polygon of the outer part of the inner socket and the polygon of the fitting hole in the rotation direction, a thick part and a thin part are formed in the wall thickness. If it is supported, the required strength can be secured.
At this time, by simply changing the form of the inner socket, the existing equipment can be used as it is for the outer socket.
[0008]
Here, bolts, nuts, screws and the like having a polygonal cross section can be applied as the fastening members, and any polygons other than squares, hexagons, etc. can be applied as the polygons.
In addition, it is effective particularly in the case of different diameter fastening members whose diameters are close to each other, but can be freely applied when the diameters are not close.
[0009]
According to a second aspect of the present invention, a slit groove for punching the thickness of the inner socket is provided near the apex of the polygon of the fitting hole of the inner socket.
Here, if the phase of the polygon of the outer shape portion and the polygon of the fitting hole are shifted, the thickness near the apex of the polygon of the outer shape portion becomes thicker, instead of the thickness of the polygon near the apex of the fitting hole. The thickness tends to be thin, and deformation or breakage tends to occur when force is applied.
Therefore, by providing a slit groove in a thin portion in advance, it is difficult to cause deformation, breakage, and the like.
A circular hole or the like for avoiding stress concentration may be provided at the end of the slit groove.
[0010]
Further, in claim 3, the phase shift between the polygon of the fitting hole of the inner socket and the polygon of the outer portion is such that the vertex of the polygon of the fitting hole is from the center point or the center point of the side of the polygon of the outer portion. The phase was shifted so as to be located at a slightly deviated point.
[0011]
In this way, if the phase shift is such that the apex of the polygon of the fitting hole is located near the center point of the polygon side of the outer shape portion, the phase shift can be increased, and the polygon of the outer shape portion can be increased. The wall thickness near the apex can be increased. That is, the strength can be increased.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is an explanatory view in which a final fastening socket is attached to a nut runner and a small-diameter fastening member is fastened, FIG. 2 is a view as viewed from an arrow A in FIG. 1, and FIG. FIGS. 4 and 5 are a sectional view and a front view of the inner socket.
[0013]
The tightening socket according to the present invention is suitable for bolts, nuts, and other screws having a polygonal cross section, particularly when applied to a device that tightens a plurality of fastening members having different diameters with a small difference in diameter. In addition, the necessary strength at the time of fastening is effectively secured, and consideration is given to maximizing the use of existing facilities.
[0014]
As shown in FIG. 1, the tightening socket 1 is attached to the tip of the drive shaft 2 of the nut runner, and is fitted to the outside of the drive shaft 2 and can be moved forward and backward by the operation of the cylinder unit 3. And an inner socket 6 that fits into the fitting hole 4k of the outer socket 4 and is fixed to the tip of the drive shaft 2 with a bolt 5.
[0015]
The outer socket 4 is urged forward by a spring 7 that assists the cylinder unit 3 on the base end side, is slidable in the axial direction with respect to the drive shaft 2, and is fixed in the rotational direction. Installed in condition.
That is, a long hole 2h penetrating with a predetermined width in the diametrical direction and extending in the axial direction is provided in the intermediate portion of the drive shaft 2, and the pin 8 inserted in the diametrical transverse direction into the long hole 2h is connected to the outer socket 4. Are engaged with the holes a. The pin 8 is prevented from being pulled out by winding the O-ring 10 over the holes a and a.
[0016]
Further, the connecting member 11 that connects the outer socket 4 and the cylinder unit 3 is provided with a bearing 12 at a joint portion with the outer socket 4.
For this reason, the outer socket 4 is rotated integrally with the rotation of the drive shaft 2 by the action of the pin 8, and when the cylinder unit 3 is operated, the outer socket 4 is within a range in which the pin 8 moves in the long hole 2h. Moves forward and backward in the axial direction along the outer surface of the drive shaft 2.
[0017]
Further, the cross-sectional shape of the tip of the fitting hole 4k of the outer socket 4 is a hexagonal shape as shown in FIG. 2, and the inner socket 6 is fitted into the hexagonal fitting hole 4k. And fixed to the drive shaft 2 as described above.
[0018]
As shown in FIGS. 2 and 3, the inner socket 6 has a hexagonal shape whose outer portion is substantially the same as the fitting hole 4 k of the outer socket 4 and is slightly smaller than the outer shape inside. The fitting hole 6k is provided.
And this fitting hole 6k is formed in the form where the phase shifted in the rotation direction with respect to the hexagonal shape of the outer shape portion, and as a result, the apex vicinity of the hexagonal shape of the outer shape portion is the thick portion m, In the vicinity of the center point is a slit groove s that punches out the wall thickness. And the circular hole e which disperse | distributes concentrated stress is provided in the base end part of this slit groove | channel s.
[0019]
By the way, in the embodiment, the phase shift between the hexagonal shape of the outer portion of the inner socket 6 and the hexagonal shape of the fitting hole 6k is such that the hexagonal apex of the fitting hole 6k is the center point of the hexagonal side of the outer shape portion. To a position slightly displaced downstream in the tightening rotation direction.
That is, if the hexagonal apex of the fitting hole 6k coincides with the center point of the hexagonal side of the outer shape, the phase shift α in FIG. 5 is 30 degrees, which is the maximum phase shift, but in the embodiment, the phase shift α Is 25 degrees.
This is because when the fastening member is fitted into the fitting hole 6k and tightened, the point of action of the maximum force applied to the fitting hole 6k is slightly downstream from the center point of the hexagonal side of the outer shape. This is because the location is shifted to the side, and accordingly, the effect of securing the strength by the thick portion m is enhanced accordingly.
[0020]
In the embodiment, the fitting hole 4k of the outer socket 4 can fasten a fastening member having a diameter of 14 mm, and the fitting hole 6k of the inner socket 6 can fasten a fastening member having a diameter of 12 mm. Has been.
[0021]
The operation and the like of the fastening socket 1 configured as described above will be described.
First, when fastening a large-diameter fastening member, the cylinder unit 3 is advanced, and the outer socket 4 is advanced and the inner socket 6 is relatively retracted as shown in FIG. .
Then, the head of a large-diameter fastening member is fitted into the fitting hole 4k of the outer socket 4, and the drive shaft 2 is rotated to perform tightening or the like.
[0022]
Next, when fastening a small-diameter fastening member, the cylinder unit 3 is retracted, and the outer socket 4 is retracted while the spring 7 is contracted as shown in FIG. Let it be in the state you let it.
Then, the head of a small-diameter fastening member or the like is fitted into the fitting hole 6k of the inner socket 6, and the drive shaft 2 is rotated to perform tightening or the like.
[0023]
By the operation as described above, the large diameter fastening member and the small diameter fastening member can be tightened with the same device. Especially when the small diameter fastening member is tightened, the thick wall portion m Since the required strength can be secured and the slit groove s is formed in the thinned portion, problems such as deformation and breakage can be suppressed.
[0024]
The present invention is not limited to the above embodiment. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the cross-sectional shape of the fitting holes 4k and 6k may be a polygon other than a hexagonal shape, and a method of moving the outer socket 4 and the inner socket 6 relative to each other is arbitrary.
[0025]
【The invention's effect】
As described above, the fastening socket according to the present invention has a rotational direction with respect to the polygon of the outer portion when forming the polygonal fitting hole of the inner socket that handles the small-diameter fastening member as in claim 1. Since the phase is made different, the thick part is formed with a thickness that increases the thickness in the direction toward the axial center in the direction orthogonal to the axial direction at the apex of the polygon of the outer part of the inner socket. It is possible to secure the necessary strength. At this time, it is only necessary to change the form of the inner socket, and since the outer socket can be used as it is, the outer socket can be configured inexpensively and easily. Further, as in claim 2, if a slit groove for punching the thickness of the inner socket is provided near the apex of the polygon of the fitting hole of the inner socket, deformation, breakage, etc. can be made difficult to occur. Then, as in claim 3, if the phase shift is such that the vertex of the polygon of the fitting hole of the inner socket is located at the center point of the polygon side of the outer shape part or a point slightly deviated from the center point The phase shift can be increased, and the thickness can be increased by increasing the thickness width near the apex of the polygon of the outer shape.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a state in which a socket for fastening is attached to a nut runner and a small-diameter fastening member is fastened. FIG. 2 is a view as viewed from an arrow A in FIG. Fig. 4 Cross-sectional view of the inner socket [Fig. 5] Front view of the inner socket [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fastening socket, 4 ... Outer socket, 4k ... Fitting hole, 6 ... Inner socket, 6k ... Fitting hole, m ... Thick part, s ... Slit groove.

Claims (3)

An outer socket having a fitting hole with a polygonal cross-section, and a fitting with a similar cross-sectional shape having an outer shape portion having substantially the same cross-sectional shape as the fitting hole of the outer socket, and being slightly smaller than the outer shape inside. A tightening socket that can be relatively moved in the axial direction with an inner socket having a hole and can be fitted to a plurality of fastening members having different diameters by relatively advancing the socket on either side. The fitting hole having a polygonal cross section formed inside the inner socket is formed such that the vertex of the fitting hole is out of phase in the rotational direction with respect to the polygonal vertex of the outer shape of the inner socket, A socket for tightening different-diameter fastening members, characterized in that the wall thickness in the direction toward the axial center in the direction orthogonal to the axial direction at the apex of the polygon of the outer shape of the inner socket is increased. 2. The socket for tightening different diameter fasteners according to claim 1, wherein a slit groove for punching out the inner socket is provided in the vicinity of the apex of the polygonal section of the fitting hole of the inner socket. Socket for tightening different diameter fasteners. 3. The socket for tightening different-diameter fastening members according to claim 1 or claim 2, wherein a phase shift between a sectional polygon of the fitting hole of the inner socket and a sectional polygon of the outer portion of the inner socket is a fitting. Different diameter fastening characterized in that the apex of the cross-sectional polygon of the hole is shifted in phase so that it is located at the center point of the side of the cross-sectional polygon of the outer part or the point slightly deviated from the center point of the side Socket for fastening components.

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