JPH0549220U - Nutrunner socket - Google Patents

Abstract

(57) [Summary] [Purpose] To smoothly insert the socket into the bolt, shorten the tightening time and improve productivity. [Configuration] At least one polygonal ridge is cut off to form a locking ridge, and a curved portion that connects the locking ridges with a radius or curvature that is at least larger than 1/2 of the diagonal dimension of the hexagonal ridge of the bolt or nut is formed. Form. [Effect] The socket can be inserted into the heads of bolts and nuts with almost no interference, without slowing the rotation and feed rate of the socket. As a result, the tightening work time is shortened and the productivity is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a nut runner socket for tightening bolts and nuts by rotation and axis feed.

[0002]

[Prior Art]

 Generally, the heads of bolts and nuts are formed in a hexagonal shape. Although tightening bolts and nuts is often done manually using a spanner, wrench, etc., there is a need to improve workability, or in an automatic line, a nut runner that automatically tightens bolts and nuts can be used. Commonly used. The nut runner has a socket 9 that fits into the hexagonal head 5 of the bolt and nut 8 as shown in FIG. 5, and moves the socket 9 in the direction toward or away from the bolt and nut 8 while The socket 9 is connected to a drive mechanism (not shown) so as to rotate the screw 9 and tighten the bolt and nut 8. Most of the heads 5 of the bolts and nuts 8 are hexagonal as described above, and most of the sockets 9 have hexagonal socket holes 10 as shown in FIG. However, there is also a socket 12 forming a dodecagonal socket hole 11 as shown in FIG. By making the socket hole 11 into a dodecagonal shape, it has a function of mitigating the positional deviation between the socket 12 and the bolts and nuts 8 and improving the degree of freedom in fitting them. Further, there is also one having a polygonal socket hole.

[0003]

[Problems to be solved by the device]

 In the case of the sockets 9 and 12 shown in FIG. 3 and FIG. 4, particularly in the case of the socket 9 having the hexagonal socket hole 10, there is a problem that the socket 9 and the bolts and nuts 8 are difficult to fit. That is, the socket 9 of the nut runner is automatically fed to the side of the bolt and nut 8 to be fitted therein while rotating in advance, and it is difficult for the head 5 of the bolt and nut 8 in the stationary state and the socket hole 10 to coincide with each other. In this case, if the socket hole 10 and the bolt / nut 8 are forcibly fitted together, an unreasonable force acts on both the socket 9 side and the bolt / nut 8 side, causing a problem of damaging both or one side. . Further, if the bolts and nuts 8 are tightened in an imperfect state, the tightening force may be insufficient, or so-called galling may occur in which the screw grooves of the bolts and nuts are bitten into the opposite side. For this reason, conventionally, the rotation and / or feed speed of the nut runner has been slowed in the vicinity of the bolt and nut 8 so that the socket 9 and the bolt and nut 8 can be fitted as smoothly as possible. However, this method has a problem that the working time becomes long and the productivity cannot be improved.

The present invention solves the above problems, and provides a socket for a nut runner capable of smoothly fitting the socket, the bolt, and the nut, shortening the tightening time, and improving the productivity. The purpose is to

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a socket for forming a multi-angled ridge for tightening bolts and nuts of a polygonal head. The nut runner socket is formed by connecting the engaging crests with a curve having a radius or a curvature that is at least larger than 1/2 of the diagonal dimension of the hexagonal crests of the bolt and nut.

[0006]

[Action]

 At least every other mountain of the socket having the polygonal mountain is cut off. That is, in the case of a hexagonal mountain, three mountains are missing. The remaining locking crests are connected by a curve with a radius or curvature that is greater than 1/2 the diagonal dimension of the hexagonal crests of the bolt and nut, so the socket and the bolts and nuts do not interfere at all between the locking crests. It is also possible to tighten the bolts and nuts by locking the remaining locking peaks to the bolts and nuts. As a result, the socket can be fitted relatively easily without interfering with the bolts and nuts, the rotation and feed need not be slowed down, and the bolts and nuts can be tightened quickly. Can be improved.

[0007]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a socket 1 forming three locking ridges 2 and FIG. 2 shows a socket 1a forming six locking ridges 2a. The locking crests 2 have a shape formed by omitting every other hexagonal crest, and as shown in the figure, are formed in a triangular crest shape protruding inward. The hexagonal ridges of the heads 5 of the bolts and nuts (shown by chain double-dashed lines) are locked to the locking surfaces 3 and 4 on both sides. The head 5 is held by the socket 1 when the head 5 is locked to the three locking ridges 2, and the head 5 can be rotated by rotating the socket 1. An arcuate portion 7 having a radius R is formed between the adjacent locking ridges 2 and 2. The radius R is set to be at least larger than 1/2 of the diagonal dimension between the hexagonal peaks 6 and 6 of the head 5.

Next, the tightening action of the bolts and nuts by the socket 1 shown in FIG. 1 will be described. Insert the socket 1 into the head 5 of the bolt and nut. When the hexagonal ridge 6 of the head 5 is disengaged from the locking ridge 2 and is inside the arcuate portion 7, the socket 1 is inserted into the head 5 without any resistance. Therefore, unlike the prior art, the socket 1 is smoothly inserted into the head 5, and it is not necessary to reduce the speed in front. Since the socket 1 is rotating, the head portion 5 located at the position of the circular arc portion 7 comes into contact with the locking ridge 2 and locks. Therefore, the rotation of the socket 1 is directly transmitted to the head 5, and the bolts and nuts are tightened. When the socket 1 is inserted, the locking crests 2 and the hexagonal crests 6 of the head 5 may collide directly with each other, but the chance is small, and even if they collide with each other, they will be immediately displaced. The mountain 6 comes to the position of the arc portion 7. Therefore, the socket 1 is smoothly inserted into the head 5 as described above.

FIG. 2 shows another embodiment of this embodiment. The present embodiment shows a socket 1a in which every other twelve corner ridges are cut off to form six locking ridges 2a. As in the previous embodiment, the adjacent locking crests 2a and 2a are connected by an arc having a radius R at least larger than 1/2 of the diagonal dimension of the hexagonal crest of the head 5 of the bolt or nut, and the arc portion 7a is connected. Form . As described above, smooth insertion is possible as compared with the conventional dodecagonal socket.

In the above embodiment, the arcuate portions 7 and 7a having the radius R are formed as the curved portions between the adjacent locking crests 2, 2, 2a and 2a, but the curved portions are not limited to the arcuate portions 7 and 7a. Any curve may be used as long as it has a curvature that is at least larger than 1/2 of the diagonal dimension of the hexagonal mountain of the head 5. Further, although the above embodiment has been described with respect to the hexagonal mountain and the dodecagonal mountain, it may be applied to the polygonal mountain. Further, in order to reduce wear of the locking crests, the hardness may be increased or another hard member may be fixed.

[0011]

[Effect of the device]

 According to the present invention, the following effects can be obtained. (1) Since the curved portion is formed, there is little interference between the socket and the heads of the bolts and nuts, and smooth insertion is possible. (2) Since there is little interference between the socket and the head, it is not necessary to slow down the rotation and feed speed of the socket when inserting the socket. This speeds up the tightening work and improves productivity. (3) The bolts and nuts can be securely tightened like the conventional socket by locking the locking ridges and the heads of the bolts and nuts. (4) The shape of the locking ridge and the curved portion is simple and can be formed at low cost.

[Brief description of drawings]

1 is a cross-sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional hexagonal socket.

FIG. 4 is a cross-sectional view of a conventional dodecagonal socket.

FIG. 5 is a partial axial cross-sectional view showing an outline of an engagement state between a conventional nut runner socket and a bolt.

[Explanation of symbols]

 1 Socket 1a Socket 2 Socket hole 2a Socket hole 3 Locking surface 4 Locking surface 5 Head 6 Hexagonal mountain 7 Arc part 7a Arc part 8 Bolt nut

Claims (1)

[Scope of utility model registration request] 1. A socket for forming a polygonal ridge for tightening a polygonal head bolt and nut, wherein the ridge is at least 1.
One of the hexagonal peaks of the bolts and nuts has a diagonal dimension of
A nut runner socket, characterized in that they are connected by a curve having a radius or curvature that is at least larger than 2.