JPH0524423Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a tightening force adjustment mechanism for a toggle clamp used to clamp a workpiece in a predetermined position when assembling sheet metal of an automobile body or machining machine parts. Regarding.

(Prior art) Conventionally, when clamping a workpiece 44 on the base 6 as shown at the left end in FIG. It has been proposed by the applicant (Japanese Patent Publication No. 54-
3280). The remaining part (right half) of FIG. 4 is a toggle clamp having a locking mechanism, which is also proposed by the applicant of the present invention (Japanese Patent Application No. 60-249533). However, in the attachment 43 in Fig. 4, the two washers 56, 56
The adjustment bolt 55 had to be fixed with two lock nuts 58, 58a to a, which caused a problem that the work was time-consuming.

The details of the structure in FIG. 4 are as follows. Reference numeral 1 denotes a base bracket fixed to the base 6 with bolts (not shown), etc., and a pin receiver is provided in the front part of the bracket body 2 (left part in Figure 1) parallel to the length direction of the bracket body 2. A protruding portion 2a is provided, and two pin insertion holes 3 and 4 are formed in this pin receiving portion 2a. A pin 5 is inserted and fixed in this pin insertion hole 3, and a workpiece pressing arm 7 is pivotally supported on this pin 5. The workpiece pressing arm 7 presses the workpiece 44 downward via an attachment 43, and is composed of a front pressing part 8 and a rear link part 9, and the link part 9 is provided with pin insertion holes 10 and 11. The pin 5 is inserted into the pin insertion hole 10. 13 is a link member that connects the base bracket 1 and the handle 23;
Pin insertion holes 14 and 15 are formed near both ends in the length direction, and a pin 17 is inserted and fixed into the pin insertion hole 14 and the pin insertion hole 4. Pin insertion holes 24 and 25 are bored in the front part of the handle 23, and the pin 18 is inserted into the pin insertion hole 24 and the pin insertion hole 11, and the pin insertion hole 25 and the pin insertion hole 1 are inserted into the pin insertion hole 24 and the pin insertion hole 11, respectively.
A pin 19 is inserted through each of the pins 5, and the pin receiving portion 2a, the link portion 9, the link member 13, and the front portion of the handle 23 form a toggle link mechanism.

Further, an unclamping lever 27 is rotatably mounted inside the handle 23 via a pivot shaft 28 fixed to the handle 23, and is pivoted at approximately the center in the lengthwise direction of the handle 23. A locking pin 30 is fixed close to the front end surface of the clamping lever 27. 31 is the clockwise direction (arrow A) of the unclamping lever 27 in FIG.
This is a stopper pin to restrict rotation.

Further, a claw member 34 is pivotally supported on a pin receiving portion 39 at the rear of the base bracket 1, and this claw member 34 has a claw portion 35 with an inclined surface 35a formed on the upper part thereof, and is attached to the base bracket 1. A hook-shaped stopper 36 is provided which locks and restricts the rotation of the claw member 34 in the clockwise direction (arrow B) in FIG. A coil spring 41 is interposed, and this torsion coil spring 41 urges the claw member 34 in the clockwise direction (arrow B) in FIG. stopper 36
As shown in FIG. 5, it extends rearward and horizontally lateral to the base bracket 1, and is locked to the base bracket 1 at this horizontally lateral portion 36a.

Next, the operation will be explained. To change from the unclamped state shown by the solid line in FIG. 4 to the clamped state shown by the imaginary line in FIG. 4, the handle 23 may be rotated clockwise (arrow A) in FIG. At the same time, the locking mechanism consisting of the pawl member 34, locking pin 30 and torsion coil spring 41 is activated.
That is, when the handle 23 is rotated until the locking pin 30 comes into contact with the inclined surface 35a, the claw member 34 receives a force in a counterclockwise direction (in the direction opposite to arrow B), and the claw member 34 retreats from the locking pin 30. When the locking pin 30 passes through the inclined surface 35a, the claw member 34 rotates clockwise (arrow B) due to the action of the torsion coil spring 41, and the claw portion 35 moves against the locking pin 3.
It is locked by stopping at 0. In this locked state, the handle 23 will not rotate no matter what force is applied to the handle 23, and the workpiece 44 by the workpiece pressing arm 7 will not rotate.
The clamp state is never released.

In order to return to the unclamping state shown by the solid line in FIG. 4 from this state, the unclamping lever 27 is rotated counterclockwise (in the direction opposite to arrow A). The tip rotates in the direction of arrow C and the claw member 34
is rotated counterclockwise (in the opposite direction to arrow B), and the engagement of the claw portion 35 with the locking pin 30 is released). At the same time, the handle 23 is rotated in the counterclockwise direction (in the opposite direction to arrow A). By this operation, the state shown by the imaginary line in FIG. 4 can be returned to the state shown by the solid line. The unclamping lever 27 can be rotated counterclockwise (in the direction opposite to arrow A) automatically by gripping the handle 23 with one hand, and the unclamping state can be achieved with one touch with one hand.

(Purpose of the invention) The object of the invention is to enable the adjuster bolt to be easily adjusted using one lock nut.

(Structure of the invention) The present invention is a toggle lamp comprising a base bracket, a workpiece pressing arm, and a handle, the workpiece pressing arm and the handle being interlocked via a link mechanism. It is formed by a pair of arm plates that sandwich the vertical pin receiving part of the base bracket, and each arm plate has a longitudinal slit parallel to its lower edge, and both ends of the plate nut can be slid freely into both slits. At the same time, the plate nut is provided with a rotation prevention plate that engages with the edge of the slit, and the adjustment bolt is passed through the center hole of the U-shaped washer fitted to the lower edge of the arm plate and screwed into the plate nut. This is a tightening force adjustment mechanism for a toggle clamp that tightens a washer to a lock nut on a bolt.

(Example) The base bracket 1 shown in Fig. 1 has a structure in which a sheet metal member with an L-shaped cross section that integrally has vertical pin receiving parts 2a and 39 is fastened with pins 5 and 17 or integrated by spot welding etc. The link portion 9 and the link member 13 are rotatable on the pins 5 and 17. A claw member 34 (lever with claw) fits closely between the pair of pin receivers 39, and the lever with claw 34 is rotatable on the pin 42, but there is almost no play in the direction of the pin 42. does not have The claw lever 34 is located on the front side (first
An arc-shaped back surface 45 is provided on the left side of the figure, and the tip of the pressing side 46a of the leaf spring 46 is in masculine contact with this back surface 45. The holding side 46a is a member in which the rear end of the base plate 46b of the leaf spring 46 (the end on the claw lever 34 side) is bent at right angles to the base plate 46b and extended upward. It has a contact point 47 that protrudes like a crab. The pin 17 fits into the hole 51 drilled in the substrate 46b, the lower edge of the substrate 46b abuts the upper end of the low cylindrical extruded boss 48 provided in the vertical pin receiving part 2a, and the pin 17 of the substrate 46 This prevents counterclockwise rotation around the center. In order to prevent rotation of the board 46b, the board 46b is
A bent portion 49 that engages with the upper edge of the pin receiving portion 2a may be provided on the upper edge of the front end of the substrate 46.
The lower edge of b may be brought into contact with the upper surface of the horizontal lower plate of the base bracket 1.

The illustrated handle 23 is a U-shaped sheet metal member that opens downward, and two sheet metal connectors 50 having approximately the same thickness as the pin receiving portion 2a are fitted to its front end, and are integrated with the handle 23 by spot welding at a portion 51. By using this connector 50,
The entire structure can be constructed by combining sheet metal parts.

The front end of the connector 50 is the workpiece pressing arm 7
The arm plate 52 is inserted between a pair of arm plates 52 made of sheet metal and is connected by a pin 18. Each arm plate 52 has a longitudinal slit 53 near its upper edge, and the slit 53 extends long in parallel with the upper and lower edges of the arm plate 52. A plate nut 54 is fitted into the slit 53, and the plate nut 54 has both sides. An adjustment bolt 55 inserted from below between the arm plates 52 is screwed together. The adjusting bolt 55 passes through a hole 57 of a washer 56 with an upwardly opening U-shaped cross section that is fitted from below to the lower edge of the arm plate 52, and a lock nut 58 screwed onto the adjusting bolt 55 locks the washer 56 into the arm. It is fastened to the lower edge of the plate 52.

To attach the leaf spring 46, place the board 46b of the leaf spring 46 against the side surface of the pin receiving part 2a, and
The lower edge of b is placed on the extrusion boss 48, and the head of the pin 17 is tightened to the pin receiving portion 2a via the link member 13. To adjust the position of the adjusting bolt 55, loosen the lock nut 58, use a wrench to turn the adjuster post 55 to set the desired position, and tighten the lock nut 58 with the spanner applied to the head of the adjuster bolt 55. .

(Effect of the invention) As explained above, according to the invention, the plate nut 54 is fitted into the slit 53 and is prevented from turning by the stepped portion 60.
It can only slide freely inside, and one lock nut 5
The position of the adjusting bolt 55 with respect to the arm plate 52 can be easily adjusted by loosening the adjusting bolt 8, operating the adjusting bolt 55, and then tightening the lock nut 58. Moreover, since the gap between the plate nut 54 and the lock nut 58 can be made sufficiently large, the adjusting bolt 55 becomes as if supported at two points, and the adjusting bolt 55 can be rigidly fixed to the arm plate 52. Further, since the load is applied in the plane direction of the arm plate 52, deformation is minimized, and there is no risk of loosening after long-term use, and there is an advantage that the clamped state can be maintained stably for a long time. In addition, since the plate nut 54 is not exposed above the arm plate 52, there is no possibility of tools or other parts colliding with the upper end of the adjuster bolt 55 or the nut, causing it to come loose, and furthermore, it prevents workers from getting injured during work. There are fewer protrusions that could cause damage, improving safety.

[Brief explanation of the drawing]

Fig. 1 is a partial side view, Fig. 2 is a partial plan view, Fig. 3 is a partial cross-sectional view of Fig. 1, Fig. 4 is a side view showing the conventional example, and Fig. 5 is a - arrow in Fig. 4. This is a perspective view. 1... Base bracket, 2a... Pin receiving part,
7...Work pressing arm, 23...Handle,
52... Arm plate, 53... Slit, 54...
Plate nut, 55... Adjustment bolt, 56...
Washer, 57...hole, 58...lock nut, 60
...Danbe.

Claims (1)

[Scope of utility model registration request] In a toggle clamp that includes a base bracket, a workpiece pressing arm, and a handle, and is configured such that the workpiece pressing arm and the handle are interlocked via a link mechanism, the workpiece pressing arm is attached to a vertical pin receiver of the base bracket. sandwich the part 1
It is formed by a pair of belt-shaped arm plates, and each arm plate is provided with a longitudinal slit parallel to its lower edge, and both ends of a plate nut are slidably fitted into both slits, and the plate nut is engaged with the edges of the slit. Provide a matching locking step, pass the adjusting bolt through the center hole of the U-shaped cross-section washer fitted to the lower edge of the arm plate, screw it into the plate nut, and tighten the lock nut on the adjusting bolt to the washer. Tightening force adjustment mechanism for toggle clamps.