JPH0637868Y2 - Bolt tightening shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a bolt tightening shaft in which a socket wrench can be easily attached to and detached from a rotating shaft.

(Prior Art) Conventionally, for example, in a tightening device that simultaneously tightens a plurality of bolts, a multi-axis bolt tightening shaft is used, and such a bolt tightening shaft is as shown in FIG. The composition is known. That is, the bolt tightening shaft is a prismatic rotating shaft 52 that is rotated by the rotational driving force from the main body 51, and a socket wrench 54 that has a square hole for inserting into the rotating shaft 52 and is fixed with a pin 53. The socket wrench 54 is biased forward by a spring 55. The socket wrench 54 is slidable in the axial direction with respect to the rotating shaft 52, and the rotating shaft 52 is provided with a long hole 52a extending in the axial direction. This elongated hole is provided so as to penetrate through the center of the rotary shaft at right angles to the two opposite sides (left and right direction in FIG. 3), and the hole width is substantially the same as the diameter of the pin 53 described above. It is attached by inserting. A cap 56 was provided on the upper surface of the pin 53.

Therefore, the socket wrench 54 can move in the axial direction (the vertical direction in FIG. 3) in which the pin 53 can move in the elongated hole 52a, and rotates with the rotating shaft 52 in the rotating direction. It was

(Problems to be solved by the invention) However, in the past, when the type of bolt to be handled was changed and the socket wrench was replaced, a very complicated replacement work was forced. In other words, it is necessary to first remove the cap 56, then knock out the pin 53 from one side of the pin 53 to remove the socket wrench 54, and then attach a new socket wrench in the same reverse order as described above. When replacing each socket wrench of the attached shaft at the same time, it not only takes time, but also when the distance between the shafts is small, there is a problem that work tools and hands cannot be inserted between the shafts and work is difficult to do. It was

(Means for Solving the Problem) In order to solve the problem, the present invention provides a socket wrench having a rotary shaft having a long groove or a long hole along the axial direction and a ball which can be retracted and retracted toward the long groove or the long hole. An outer collar is provided which is fitted on the outer circumference of the socket wrench and regulates the appearance of the balls. Then, one end side of the outer collar was biased by a spring and the other end side was engaged with the flange portion of the socket wrench.

(Function) Push the socket wrench with the inner peripheral surface of the outer collar,
The socket wrench is connected to the rotary shaft by engaging the ball with the long groove or long hole of the rotary shaft. Further, since the ball can move along the long groove or the long hole, the socket wrench can move in the axial direction of the rotating shaft.

Also, by moving the outer collar with respect to the socket wrench so that the relief part faces the ball position, the ball can be disengaged from the rotary shaft long groove or slot, and the rotary shaft and socket wrench can be separated. Becomes

(Embodiment) An embodiment of the bolt tightening shaft of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a vertical cross-sectional view of the entire bolt tightening shaft, (A)
FIGS. 2 (C) to 2 (C) are respective state diagrams at the time of tightening, and FIG. 2 is an action diagram showing the state at the time of attachment / detachment.

The bolt tightening shaft of the present invention is applied to a vertically movable multi-shaft tightening device, and as shown in FIG. It is configured vertically.

A prismatic rotary shaft 2 that hangs downward from a vertically movable device main body 1 is made rotatable by a rotary drive device on the main body 1 side, and this rotary shaft 2 is shown in FIG. 2 (C). Thus, a long hole 2a having a predetermined length is provided along the axial direction.

The rotary shaft 2 is fitted with a square fitting hole 4a of a socket wrench 4, and further below the fitting hole 4a is a loose fitting hole 4b.
Is provided. A flange portion 4c is provided at a predetermined position on the outer circumference of the socket wrench 4, and an outer collar 7 is fitted on the outer circumference of the upper surface of the flange portion 4c so as to be slidable along the outer circumference surface.

The connection between the rotary shaft 2 and the socket wrench 4 is made by a plurality of balls 3 pushed by the inner peripheral surface of the outer collar 7, that is, the diameter of the balls 3 is larger than the wall thickness of the cylindrical socket wrench 4. It is embedded in the socket wrench 4 and is capable of appearing and retracting on either side of the outer collar 7 fitting surface which is the outer peripheral surface of the socket wrench 4 or the rotary shaft 2 fitting surface which is the inner peripheral surface of the socket wrench 4. Since the position of the ball 3 coincides with the position of the long hole 2a of the rotary shaft, when the inner peripheral surface of the outer collar 7 abuts as shown in the drawing, the ball 3 projects toward the rotary shaft 2 fitting surface side, The tip of the shaft is inserted into the long hole 2a of the rotary shaft 2. In this state, the ball 3 can be moved, that is, the socket wrench 4 can be moved only in the vertical direction along the elongated hole 2a.

On the other hand, the outer collar 7 is biased downward by a spring 5, and a ball escape portion 7a is provided on a part of the inner peripheral surface of the outer collar 7. The escape portion 7a has a depth such that the ball 3 is recessed inward from the mating surface of the rotating shaft 2 when the ball 3 is inserted therein, and the upper side is a groove shape inclined by a taper portion. . Further, in order to align the escape portion 7a and the ball 3, a circlip 6 is provided on a part of the outer circumference of the socket wrench 4 so that it can be engaged with the upper surface of the outer collar 7.

In the tightening using the bolt tightening shaft thus configured, as shown in FIG. 1 (B), first, the main body 1 is lowered and the bolt is tightened.
After the socket wrench 4 is fitted into the 20 head, the main body 1 further descends. At this time, the ball 3 of the socket wrench 4 moves to the upper part of the long hole 2a along the long hole 2a of the rotary shaft 2, and at the same time, the spring 5 is compressed.

Next, by the main body drive source, the rotary shaft 2 and the socket wrench 4
Rotates and bolts are tightened.

With tightening, the socket wrench 4 descends as shown in (C), and when tightening is completed, the main body 1 rises.

The socket wrench 4 of the bolt tightening shaft is attached and detached by the procedure shown in FIG.

First, as shown in FIG. 2 (A), the socket wrench 4 is held and fixed with one hand, and the outer collar 7 is pulled up with the other hand until it comes into contact with the circlip 6. This position is a position where the escape portion 7a and the ball 3 coincide with each other, and if the socket wrench 4 is pulled down in this state, it is easily disengaged as shown in FIG.

The fitting may be performed in the reverse order of the above operation.

In this embodiment, the rotary shaft 2 is a prism, the fitting hole 4a of the socket wrench 4 is a square hole, and the transmission torque is transmitted to the socket wrench 4 at each corner.
If the cylindrical shape is used and the fitting hole 4a is a circular hole to transmit the rotational force through the balls 3, the manufacturing cost can be further reduced. Further, in this embodiment, the rotary shaft 2 is provided with the long holes 2a, but it may be a simple long groove of the recess, and the number of the long holes 2a is not particularly limited.

(Effects of the Invention) As described above, the bolt tightening shaft of the present invention allows the socket wrench and the rotary shaft to be attached and detached with one touch. Especially, the tightening shaft in a place where the distance between the shafts is narrow by a multi-shaft tightening device or the like. Is useful for. Moreover, since the conventional rotary shaft can be used as it is, the repair cost can be reduced.

[Brief description of drawings]

FIG. 1 shows a vertical cross-sectional view of the entire bolt tightening shaft, (A)
From Fig. (C), each state diagram at the time of tightening, the second (A),
(B) is an operation view showing a state at the time of attachment / detachment, (C) is a side view and a bottom view of the rotary shaft, and FIG. 3 is a longitudinal sectional view showing a conventional example. In the drawings, 1 is a main body, 2 is a rotary shaft, 2a is a long hole, 3 is a ball, 4 is a socket wrench, 4c is a flange part, 5 is a spring, 7 is an outer collar, 7a is a relief part, and 20 is a bolt. , 51 is a main body, 52 is a rotary shaft, 52a is a long hole, 54 is a socket wrench, 55 is a spring, and W is a work.

Claims (1)

[Scope of utility model registration request] 1. A bolt tightening shaft provided with a socket wrench for tightening a bolt at the tip of the rotating shaft, wherein the bolt tightening shaft comprises a rotating shaft having a predetermined number of long grooves or long holes in the axial direction. A socket wrench that is slidably fitted to the rotating shaft and has a flange on a part of the outer peripheral surface.
The socket wrench is slidably fitted to the outer periphery of the socket wrench, one end of which is biased by a spring and the other end of which is provided with an outer collar that engages with the flange portion. A ball, which is pushed in by a protrusion and is protruded to the fitting surface side of the rotary shaft, is provided in correspondence with the position of the long groove or the long hole of the rotary shaft, and a relief portion for the ball is provided at a predetermined position of the outer collar. A bolt tightening shaft characterized in that