JPH0318136Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening device for fixing a workpiece, and in particular to an improvement of a device for quick tightening in response to changes in the shape and dimensions of the workpiece.

Universal tightening devices are usually provided with a quick tightening mechanism. This quick tightening mechanism is effective in rapidly performing tightening operations in response to changes in the shape and dimensions of the workpiece. In the conventional quick tightening mechanism, the movable cap is moved to a predetermined position using a ratchet mechanism or a lock pin, and the movable cap is fixed at that position by the ratchet or lock pin. According to these ratchet and locking pin mechanisms,
The feed position for quick tightening is limited by the pitch of the ratchet or lock pin, so the amount of tightening increases.If the pitch is narrowed, the tooth thickness of the ratchet and the thickness of the bottle become smaller, resulting in a large Tightening force cannot be obtained. Furthermore, because the ratchets and locking pins fit together, troublesome operations are required and rapid rapid feeding is difficult.

On the other hand, JP-A-48-50400 and JP-A-57-
Publication No. 21275 discloses a quick-tightening mechanism using a half screw of one pitch or less. However, all of these mechanisms serve as both a lock portion for quick tightening and a screw portion for tightening. For this reason,
If the handle is turned more than once during tightening after quick tightening, the lock for quick tightening will be released, so the tightening margin cannot be increased more than once. As a result, the tightening margin is limited and sufficient tightening force cannot be obtained.

Therefore, an object of the present invention is to enable a simple rapid feed operation and to set the interference to the minimum possible value.

Based on the above object, the present invention combines a lockshaft with a feed hole of a lock member so as to be relatively movable in the axial direction, and a lock shaft with a specific rotation angle is attached to the outer periphery of the lock shaft and the inner periphery of the feed hole. Engaging bodies are formed along the direction of movement that sometimes engage with each other and prevent their mutual axial movement. When the lockshaft is set at a rotation angle other than a specific rotation angle, the lockshaft and the feed hole are in a relatively freely movable state, and this is utilized to perform quick tightening. In addition, when the lockshaft is rotated to a specific rotation angle position after quick tightening has been completed, the lockshaft and feed hole meshing body will
Since they engage with each other and prevent relative movement between the lock shaft and the lock member, they are in a locked state and can be tightened in that state.

Hereinafter, the configuration and functions of the present invention will be specifically explained based on the drawings.

First, FIGS. 1 to 5 show a tightening device 1 for heavy loads. This tightening device 1 has a base 2 as the main structural part. The base 2 forms a clamping surface 3 at one end, a locking member 4 at the other end, and a guide surface 5 at the upper surface between them.
The movable cap 6 is movably held by its guide surface 5. The movable cap 6 forms a rectangular groove 7 together with the splint plate 8, and the surface of this sliding groove 7 is in contact with the guide surface 5, and the portion facing the tightening surface 3 forms a tightening surface 9. are doing.

On the other hand, the lock member 4 has a substantially elliptical feed hole 10 aligned in the direction of movement of the movable cap 6 at its center, and a lock shaft having a substantially similar cross-sectional shape as shown in FIG. 11 is held movable in the axial direction. Further, the feed hole 10 is integrally formed with internally threaded engaging bodies 12 along the direction of the feed hole 10 at positions on the upper and lower surfaces thereof. Further, the lockshaft 11 has externally threaded engaging bodies 13 integrally formed on the surface facing the engaging body 12, respectively. An operating grip 14 is fixed to one end of the lockshaft 11 by screwing. In addition, the lock member 4
supports a detent 16 rotatably by a screw shaft 15 on one side thereof. This detent 1
6 has a retaining groove 17 having a shape substantially equal to the cross-sectional shape of the lockshaft 11.

Further, the lockshaft 11 has a shaft hole 18 at its center, and a tightening shaft 19 is rotatably supported in the shaft hole 18. The rear end of this tightening shaft 19 projects outward from the shaft hole 18, fixes a tightening handle 20 at that portion, and is connected to a head 22 by a pin 21 at its tip. This head 22 is connected to the movable cap 6
It is rotatably inserted inside the body, and is prevented from coming off by a lock nut 23. Further, at the tip of the tightening shaft 19, one or more pitches of square screw-shaped tightening male screws 24 are formed in correspondence with the necessary tightening allowance. It engages with an internal thread 25 formed on the inner surface of the part.

Next, the operation of the tightening device 1 will be explained.

A workpiece 26 to be processed is placed between the clamping surfaces 3 and 9, and is clamped by movement of the movable mouthpiece 6. That is, when the operator rotates the tightening handle 20 in the tightening direction when the engaging bodies 12 and 13 are in the engaged state as shown in FIG. move in the tightening direction, and move the movable cap 6 in the same direction. During this movement process, the movable mouthpiece 6 and the base 2 rigidly clamp the workpiece 26 between their clamping surfaces 3 and 9. Of course, if the operator rotates the tightening handle 20 in the opposite direction, the tightening shaft 19 will move back, and the workpiece 26 will be released from the tightened state.

By the way, when the dimensions of the next workpiece 26 change significantly, a quick tightening operation is performed. This quick tightening operation is performed by removing the detent 16 from the lockshaft 11, then grasping the operating handle 14 and rotating the lockshaft 11 by a rotation angle of 90 degrees from the engaged position as shown in FIG. It can be done. In this state, the meshing bodies 12 and 13 are disengaged, and the lockshaft 11 can freely move in the axial direction inside the feed hole 10. The operator then moves the lockshaft 11 directly in the axial direction while holding the grip 14. This allows the movable cap 6 to move steplessly and continuously along the guide surface 5 to an appropriate position. By rotating the lockshaft 11 again by 90 degrees in the opposite direction or in the same direction while the clamping surface 9 is in contact with the workpiece 26, the engaging bodies 12 and 13 are engaged again.
Preventing axial movement of the lockshaft 11 in the new position. When the stopper groove 17 of the detent 16 is fitted into the lockshaft 11 in this state, the lockshaft 11 no longer rotates and maintains its position. Therefore, in this state, rigid tightening can be performed at a new position in the same manner as described above.

In the above embodiment, the engaging bodies 12 and 13 are formed on opposing surfaces, but they may be formed only on one of the surfaces or half the circumferential surface.
In this case, both end portions of the interlocking bodies 12 and 13 are
It is best to make it tapered to ensure smooth engagement. Further, the feed hole 10 is not limited to an elliptical shape, and may have a rectangular or other arbitrary cross-sectional shape.

In the present invention, by rotating the lockshaft by a predetermined angle, the lock member is able to move freely in the axial direction of the lockshaft, so that rapid feeding of the movable jaw can be performed quickly.
Furthermore, since the meshing body is provided along the axial direction of the feed hole and the lockshaft, the relative position of the lock member and the lockshaft can be set to any desired position, and therefore the tightening allowance for final tightening of the workpiece can be set at any desired position. Can be made as small as possible. In particular, in the present invention, the tightening screw mechanism is provided inside the lockshaft in a state independent from the lock member and lockshaft engaging body, and when tightening and fixing a workpiece, the tightening shaft rotates once due to the presence of a male screw with one or more pitches. Since it can rotate more than
Also, during the tightening operation, the tightening start position of the movable cap can be set arbitrarily within the range of forming the external thread.

If the engaging body is formed of a screw, even when the lock shaft is rotated in the engaging direction after the lock member has been moved, the lock shaft will move in the tightening direction, which will reduce the final tightening margin. It can be made even smaller.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the tightening device, Fig. 2 is a partially cutaway front view of the same device, Fig. 3 is a partially cutaway side view of the same device, Fig. 4 is an enlarged sectional view of the lockshaft in its free state; FIG. 5 is an enlarged sectional view of the lockshaft in an engaged state. DESCRIPTION OF SYMBOLS 1...Tightening device, 2...Base, 3...Tightening surface, 4...Lock member, 6...Moving base, 10
...Feed hole, 11...Lockshaft, 12,1
3...Interlocking body.

Claims (1)

[Scope of utility model registration request] In a tightening device 1 that clamps and fixes a workpiece 26 between a tightening surface 3 at one end of the base 2 and a movable mouthpiece 6 movable along a guide surface 5 of the base 2, a locking member 4 is attached to the other end of the base 2. is provided integrally with the base 2, a feed hole 10 is provided in the lock member 4 in the direction of movement of the movable base 6, and a lock shaft 11 is rotatably inserted into the feed hole 10 so as to be relatively movable in the axial direction. and lockshaft 1
1 and inside the feed hole 10, interlocking bodies 12 and 13 consisting of partial screws are formed in the circumferential direction across the movement direction of the lockshaft 1, and are tightened inside the shaft hole 18 of the lockshaft 11. Insert the shaft 19, screw the male thread 24 of one or more pitches formed on the tightening shaft 19 into the female thread 25 formed in the shaft hole 18 of the lockshaft 11, and attach the tip of the tightening shaft 19 to the movable cap 6. A tightening device characterized by being rotatably connected.