JP4172940B2 - Multi-diameter fastening socket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-diameter fastening socket capable of fastening (releasing) two types of fastening members (bolts or the like) having different diameters.
[0002]
[Prior art]
As sockets attached to the tip of nut runners and the like, those that can be used for two types of fastening members having different diameters are disclosed in Japanese Utility Model Laid-Open Nos. 56-42870, 8-257927, and 11-207644. Has been.
[0003]
As shown in FIG. 5A, the multi-diameter fastening socket disclosed in the above prior art is arranged when the inner socket 101 is disposed so as to be relatively movable in the axial direction inside the outer socket 100 and a small-diameter bolt is tightened. When the inner socket 101 is fixed at the advanced position as shown in FIG. 5A and a large-diameter bolt is tightened, the inner socket 101 is moved backward as shown in FIG. 5B. It is configured to be fixed with.
[0004]
[Problems to be solved by the invention]
In the conventional multi-diameter fastening socket described above, even if a part of the inner socket is worn, the entire inner socket must be replaced, which is problematic in terms of cost.
Further, in the conventional multi-diameter fastening socket, the outer socket and the inner socket are in surface contact with each other, so that the resistance when the inner socket is relatively moved in the axial direction during switching may be greatly caught.
Similarly, in the conventional multi-diameter tightening socket, since the side surface of the fitting hole is a plane parallel to the side surface of the bolt head in both the outer socket and the inner socket, There are times when it does not get into well.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the multi-diameter fastening socket according to the present invention is provided with a plurality of socket pins that fit into the top corners of the fitting holes of the outer socket, and the socket pins can be individually replaced. .
With the above configuration, only the worn socket pin needs to be replaced.
[0006]
Further, as the shape of the fitting hole of the outer socket, a configuration in which the side surface between the apex corners is a curved surface bulging inward, and the shape of the socket pin is considered to have a substantially fan-shaped cross section. By doing so, it becomes easy to put the socket pin into the apex portion of the fitting hole of the outer socket.
[0007]
Further, it is preferable that the inner surface of the fitting hole of the outer socket and the outer surface of the socket pin are in point contact in cross section. By using point contact, it is possible to eliminate the catch at the time of switching.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a general view in cross section of a main part of a multi-diameter fastening socket according to the present invention, FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is a cross-sectional view in direction BB in FIG. It is a perspective view of a socket pin.
One end of the multi-diameter fastening socket is an insertion portion 1 to the nut runner, and the other end is enlarged to form an outer socket 2. The outer socket 2 is formed with a fitting hole 3 into which a bolt head or the like is fitted. In the present embodiment, the fitting hole 3 has a hexagonal shape, but may be a polygonal shape.
[0009]
Further, as shown in FIG. 2, the side surface 3b between the apex corners 3a, 3a of the fitting hole 3 is a curved surface bulging inward. Thus, since the side surface 3b is a curved surface, the apex angle is about 90 °.
[0010]
Further, a concave portion 4 connected to the fitting hole 3 is formed in the middle portion of the multi-diameter fastening socket in the axial direction, and an inner pin 6 serving as a part of the inner socket 5 is inserted into the concave portion 4. The inner pin 6 is formed with an axial long hole 7, a circumferential groove 8, a chamfered portion 9 at the base end, and a groove 10 near the distal end, and the locking pin 11 is inserted into the long hole 7. . The inner pin 6 is urged in the protruding direction by a spring 12 that is mounted in the recess 4, but stops in the recess 4 by the locking pin 11. The locking pin 11 passes through the intermediate portion of the multi-diameter fastening socket. In order to prevent the locking pin 11 from coming out of the multi-diameter fastening socket, A ring 13 is provided on the outer periphery.
[0011]
A plurality of socket pins 15 are attached to the groove portion 10 of the inner pin 6 via a C ring 14. These socket pins 15 are fitted into the apex corners 3 a of the fitting holes 3 of the outer socket 2.
[0012]
Here, as shown in FIG. 4, the socket pin 15 has a fan-like bar shape as a whole, and the inner side surface 15 a is a curved surface that bulges inward, and faces the side surface 3 b of the fitting hole 3. The surface 15b is a flat surface, and the angle formed by the two surfaces 15b and 15b is about 90 °. Reference numeral 15 c denotes a locking groove of the C ring 14.
[0013]
Since the angle of the apex angle portion 3a of the fitting hole 3 is also about 90 °, the socket pin 15 smoothly enters the apex angle portion 3a. Further, the side surface 3b forming the apex portion 3a is a curved surface bulging inward, and the surface 15b of the socket pin 15 is a flat surface. Therefore, the resistance when the socket pin 15 slides along the fitting hole 3 is extremely small.
[0014]
In addition, holes 16 are formed at four locations 90 ° apart in the circumferential direction in the middle portion of the multi-diameter fastening socket, and steel balls 17 are loaded into the holes 16, and the outside is held by the cylindrical body 18. Yes. The cylindrical body 18 is slidable in the axial direction on the outer peripheral surface of the socket. A spring 20 is mounted between the receiving member 19 provided in a part of the socket and the cylindrical body 18 so that the tip of the cylindrical body 18 is the ring 13. Further, a large-diameter concave portion 21 is formed on the inner side of the distal end portion of the cylindrical body 18.
[0015]
In the above, when tightening a small-diameter bolt or the like, as shown in FIG. 1, the inner socket 5 is protruded by the elastic force of the spring 12, the tip of the socket pin 15 and the tip of the outer socket 2 are aligned, and the steel The ball 17 is used in a state where the inner socket 5 is prevented from moving backward by hitting the chamfered portion 9 of the inner pin 6.
[0016]
On the other hand, when tightening a large-diameter bolt or the like, from the state shown in FIG. 1, the cylindrical body 18 is slightly retracted against the spring 20 so that the large-diameter recess 21 of the cylindrical body 18 matches the position of the steel ball 17. In this state, the inner socket 5 (inner pin 6) is pushed in. When the groove portion 8 of the inner pin 6 and the steel ball 17 coincide with each other, the cylindrical body 18 is moved forward by the elastic force of the spring 20 and locked. As a result, the socket pin 15 is retracted, and the fitting hole 3 of the outer socket 2 appears.
[0017]
Further, when a specific socket pin of the above multi-diameter fastening socket is worn, it is necessary to disassemble it in order to cope with a bolt having a different diameter by replacing it with a socket pin having a different shape.
As a disassembling procedure, first, the receiving member 19 on the outer periphery of the socket is removed, the cylindrical body 18 and the ring 13 are pulled out along the axial direction, and the locking pin 11 is pulled out from the long hole 7 of the inner pin 6. Thereafter, the inner socket 5 (inner pin 6 and socket pin 15) is taken out from the front, the socket pin 15 is replaced with a predetermined socket pin, and reassembled in the reverse procedure.
[0018]
【The invention's effect】
As described above, according to the present invention, the inner socket provided on the inner side of the outer socket is not integrally formed, and each of the plurality of socket pins is fitted into the apex portion of the fitting hole of the outer socket. Therefore, when worn, it is advantageous in terms of cost because only the worn socket pin needs to be replaced.
[0019]
In addition, the side surface between the apex corners of the fitting hole of the outer socket is an inwardly bulging curved surface, and the socket pin has a substantially fan-shaped cross section, so that the socket pin can be smoothly fitted. If the socket pin and the socket pin are in point contact with each other in cross section, it is possible to eliminate the hook at the time of switching.
[Brief description of the drawings]
FIG. 1 is an overall view in cross-section of the main part of a multi-diameter fastening socket according to the present invention. FIG. 2 is a cross-sectional view in the direction of arrow A in FIG. ] Perspective view of socket pin [FIG. 5] (a) and (b) are cross-sectional views showing the main part of a conventional multi-diameter fastening socket [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Insertion part to nut runner, 2 ... Outer socket, 3 ... Fitting hole, 3a ... Vertical angle part of fitting hole, 3b ... Side surface of fitting hole, 4 ... Recessed part, 5 ... Inner socket, 6 ... Inner pin , 7 ... long hole, 8 ... circumferential groove, 9 ... chamfered part, 10 ... groove, 11 ... locking pin, 12 ... spring, 13 ... ring, 14 ... C ring, 15 ... socket pin, 15a ... socket pin 15b ... side face, 15c ... locking groove, 16 ... hole, 17 ... steel ball, 18 ... cylindrical body, 19 ... receiving member, 20 ... spring, 21 ... large diameter recess.

Claims (1)

  A multi-diameter fastening socket in which an inner socket is provided inside the outer socket so as to be relatively movable in the axial direction. The inner socket is a plurality of individually replaceable socket pins that fit into the apex corners of the fitting holes of the outer socket. The side surface between the apex portions forming the fitting hole of the outer socket is a curved surface that bulges inward, and the socket pin is a curved surface whose inner surface bulges inward. A multi-diameter fastening socket having a substantially fan-shaped cross-section with a side surface facing the side surface between the apex corners as a plane, and the side surface of the socket pin and the side surface between the apex portions of the outer socket being in point contact. .

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