CN1727700A - clamping mechanism - Google Patents

Abstract

The present invention provides a clamping mechanism capable of always moving a slide block in a specified direction when a clamp bolt is tightened to the slide block. This clamping mechanism comprises a slide base 2, the slide block 1 moving on the slide base 2, and the clamp bolt 15 fitted to the screw hole 1a of the slide block 1 through a clamp fitting 3. The clamp fitting 3 comprises an adjusting hole 6 in which the clamp bolt 15 is passed. The surface of the clamp fitting 3 on a clamp bolt 15 head 5 side comprises a reference surface 3b on the lower side of the adjusting hole 6 in close contact with the head 5 and a step surface 3a on the upper side of the adjusting hole 6 apart from the head 5.

Description

clamping mechanism

technical field

The invention relates to a clamping mechanism composed of a block body with a threaded hole and a clamping bolt installed in the threaded hole of the block body through a clamping fitting.

Background technique

Conventionally, the fastening method using bolts has been widely used in mechanisms around the world as a method capable of fastening a large load with a small torque. When the bolt is tightened, on the contact surface between the head of the bolt and the block (to be fastened), due to the deflection caused by the force when torque is applied to the bolt, or due to the machining error of the bolt or the contact surface The parallelism error sometimes makes the touch of the contact surface uneven. In this case, when the bolt is tightened, the fastened object may move.

As mentioned above, when the bolt is tightened, the object to be fastened sometimes moves, but the moving direction of the object to be fastened varies depending on the machining error between the contact surfaces and the way or direction of the force applied to the wrench. Different, sometimes the clamping mechanism fails due to the direction of movement of the fastened object.

Contents of the invention

The present invention has been made in view of such a problem, and an object of the present invention is to provide a clamping mechanism capable of moving a block in a desired direction during bolt fastening to securely fix the block.

The present invention is a clamping mechanism, which is characterized in that it is equipped with: a block body with a threaded hole, and a clamping bolt with a head installed in the threaded hole of the block body through a clamping fitting, and the clamping fitting There is an adjustment hole through which the clamping bolt passes, and the surface of the clamping bolt head side of the clamping fitting includes the surface on the side of the adjustment hole that is in close contact with the head of the clamping bolt, and the surface on the side of the head of the clamping bolt. The surface on the other side of the adjustment hole that forms a gap between them.

The present invention is a clamping mechanism characterized in that the block body with threaded holes is composed of a sliding block that can move on a sliding base.

The present invention is a clamping mechanism, which is characterized in that the adjustment hole of the clamping fitting is formed in an elongated shape and extends along the moving direction of the slider.

The invention is a clamping mechanism characterized in that the clamping fitting extends from the slide to the slide base.

The present invention is a clamping mechanism, which is characterized in that a stepped portion between the slide block and the slide base is formed on the surface of the slide block and the slide base of the clamp fitting.

The present invention is a clamping mechanism, which is characterized in that a dovetail groove is provided on one of the sliding base and the slider, and a dovetail groove guide that engages with the dovetail groove is provided on the other.

The invention is a clamping mechanism, which is characterized in that the adjustment hole of the clamping fitting is a round hole.

The present invention is a clamping mechanism characterized in that the center of the adjustment hole coincides with the boundary line between the surface on one side of the adjustment hole and the surface on the other side of the adjustment hole.

(invention effect)

According to the present invention, when tightening the clamping bolt, the surface on one side of the clamping fitting can be used as the contact surface with the head of the clamping bolt. Thereby, the rotating force can be applied to the clamping bolt with the surface on the side of the clamping fitting as a fulcrum, and the clamping bolt penetrates the inside of the adjustment hole of the clamping fitting, so the moving force in a certain direction can always be transferred from the clamping Tighten the bolts to the slider side.

Description of drawings

FIG. 1 is a diagram showing an embodiment of a clamp mechanism of the present invention.

FIG. 2 is an enlarged view of the clamping mechanism shown in FIG. 1 .

Fig. 3 is a diagram showing the action of the clamping mechanism.

Fig. 4 is a diagram showing a conventional clamp mechanism.

Detailed ways

Hereinafter, embodiments of the clamp mechanism of the present invention will be described with reference to the drawings.

1 to 3 are diagrams showing an embodiment of the clamp mechanism of the present invention.

Here, Fig. 1(a) is a front view of the clamping mechanism; Fig. 1(b) is a side sectional view of the clamping mechanism shown in Fig. 1(a); Fig. 2(a) is an enlarged view of Fig. 1(a) ; Figure 2 (b) is a side sectional view of the clamping mechanism shown in Figure 2 (a); Figure 3 is a diagram showing the role of the clamping mechanism.

As shown in Figures 1 to 3, the clamping mechanism has: a sliding base 2, which has a dovetail groove guide 8; a slider (clamping object) 1, which is freely movable on the sliding base 2, and has a The dovetail groove 7 to which the groove guide 8 engages; the clamping bolt 15 , which is installed in the threaded hole 1 a of the slider 1 through the clamping fitting 3 .

Among them, the clamp bolt 15 has a head 5 , and the clamp fitting 3 has a flat plate shape and has an elongated adjustment hole 6 through which the clamp bolt 15 penetrates. The elongated adjustment hole 6 extends along the moving direction of the slider 1 (left-right direction in FIG. 1( a )).

Also, a stopper 4 that is perpendicular to the clamp fitting 3 and abuts on the slider 1 is fixed to one end of the slide base 2 .

The stopper 4 is only required to be provided so as to face the slider 1 and does not need to be fixed to the slide base 2 .

As described above, the dovetail groove 7 provided on the slider 1 to be clamped is fitted into the dovetail groove guide 8 of the slide base 2 , and the slider 1 can slide freely on the slide base 2 . In addition, when the end face of the sliding base 2 is aligned with the clamping fitting 3 as shown in Figure 1 (b), between the slide block 1 and the clamping fitting 3, at the position of the head 5 of the clamping bolt 15, a For example, a gap of about 0.01 to 0.1 mm. Furthermore, the surface of the clamp fitting 3 on the side of the slider 1 and the slide base 2 has: a surface 3d which presses the side surface of the slide base 2; and a pressing surface 3c which presses the side surface of the slider 1 near the clamp bolt 15. The stepped portion 3g is located between the pressing surface 3c and the pressing surface 3d, away from the slider 1 and the sliding base 2.

In this way, the clamping fitting 3 extends from the slider 1 to the sliding base 2 , and a stepped portion 3 g is provided on the surface of the clamping fitting 3 on the side of the slider 1 and the sliding base 2 .

As mentioned above, on the clamp fitting 3, the adjustment hole 6 with a long hole is provided in the direction parallel to the dovetail guide 8, that is, the moving direction of the slider 1, and the clamp bolt 15 passes through the adjustment hole 6 and is screwed ( screw connection) in the threaded hole 1a of the slider 1. When the slider 1 slides and moves on the sliding base 2 , the clamping bolt 15 reciprocates in the adjustment hole 6 .

Also, as shown in Figure 2 (a), (b), the surface on the head 5 side of the clamping bolt 15 in the clamping fitting 3 has a stepped surface 3a on the upper side of the adjustment hole 6 and a step surface 3a on the upper side of the adjustment hole 6 . 6 The reference surface 3b on the lower side.

Moreover, in Fig. 2 (a), (b), the stepped surface 3a on the upper side of the adjustment hole 6 of the clamp fitting 3 is set at a slight height of, for example, about 0.01 to 0.3 mm with respect to the reference plane 3b on the lower side of the adjustment hole 6 . A difference (gap) is introduced.

Furthermore, in FIGS. 2( a ) and ( b ), the reference surface 3 b of the clamp fitting is the surface on one side of the adjustment hole 6 , and the stepped surface 3 a is the surface on the other side of the adjustment hole 6 .

In addition, a boundary line 3P is formed between the stepped surface 3a and the reference surface 3b, and the centerline (and center) of the adjustment hole 6 coincides with the boundary line 3P.

Hereinafter, the operation of the embodiment composed of such a configuration will be described.

As shown in FIG. 1( a ), (b), the clamping bolt 15 is loosened from the threaded hole 1 a of the slider 1 , and the slider 1 can slide on the sliding base 2 . The slider 1 is pressed by hand or the like to slide rightward in FIG. 1( a ) on the slide base 2 and abuts against the stopper 4 . When the slider 1 is in contact with the stopper 4, when the clamp bolt 15 is screwed in, the elastic deformation of the stepped portion 3g of the clamp fitting 3 will cause the clamp bolt 15 side of the clamp fitting 3 to The small gap between the pressing surface 3c of the clamping part 3 and the slider 1 is filled, and the pressing surface 3d of the clamping fitting 3 is pressed against the side surface of the sliding base 2 .

In this way, the slider 1 is fixed on the sliding base 2 through the clamping fitting 3 and the clamping bolt 15 .

During this period, the head 5 of the clamp bolt 15 that passes through the adjustment hole 6 and is screwed into the threaded hole 1a of the slider 1 is only in close contact with the reference surface 3b of the clamp fitting 3 to form an abutment surface before being screwed in. 5a, and leave (separate) the height difference t from the stepped surface 3a of the clamping fitting 3. When the clamping bolt 15 is rotated clockwise in this state to further tighten it, the frictional force of the abutting surface 5a abutting against the reference surface 3b in the head 5 of the clamping bolt 15 is greater than that of the stepped surface 3a. The friction force between them becomes larger reliably. Therefore, a rotational force with the contact surface 5 a as a fulcrum acts on the clamp bolt 15 .

When a rotational force acts on the clamp bolt 15 in this way, a torsional force in the same direction as the rotation direction of the clamp bolt 15 is applied to the slider 1 through the clamp bolt 15 . In this case, since the dovetail groove 7 of the slider 1 is fitted into the dovetail groove guide 8 of the slide base 2 , the slider 1 does not float up and down on the slide base 2 . In addition, since the clamp bolt 15 is restricted by the adjustment hole 6 of the clamp fitting 3, a moving force in the left and right direction is generated on the slider 1 as shown in FIG. 2( a ).

The movement force applied from the clamp bolt 15 to the slider 1 screwed with the clamp bolt 15 becomes a force to slide and move toward the stopper 4, and as a result, the slider 1 is pressed against the stopper 4. .

When the clamping bolt 15 is further screwed in, the head 5 of the clamping bolt 15 is elastically deformed as shown in FIG. 3 , and the head 5 abuts against the stepped surface 3 a to complete the clamping. In addition, the height difference t of the stepped surface 3a is only about 0.01-0.3 mm, which is very small (the height difference t can be appropriately set according to the size of the clamping bolt 15 or the size of the head 5 as described below), so as the clamping Elastic deformation of the head 5 of the bolt 15 prevents the head 5 from being damaged.

In addition, by providing the height difference t of the stepped surface 3a, the clamp bolt 15 rotates around the abutment surface 5a abutting against the reference surface 3b as a fulcrum, and as a result, the tightening rotation of the clamp bolt 15 (when turning clockwise) (right turn), and the advancing direction of the slider 1 is limited to the direction toward the stopper 4 side (right direction) as shown in FIG. 2( a ).

Hereinafter, a comparative example of the present invention will be described with reference to FIGS. 4( a )-( d ). As shown in Figure 4(a)-(b), when the surface 3f on the head 5 side of the clamp bolt 15 of the clamp fitting 3 is uniformly flat, the movement force applied from the clamp bolt 15 to the slider 1 does not change. Sure.

That is, as shown in Fig. 4(a)-(d), when the clamping bolt 15 is tightened in the clockwise direction, the clamping bolt 15 which abuts against the flat surfaces 3f on both sides of the adjustment hole 6 of the clamping fitting 3 When the head 5 becomes a fulcrum due to the friction between the lower contact surface 5a and the flat surface 3f of the clamp fitting 3 as shown in FIG. ), producing the effect of advancing the slider 1 and pressing it onto the stopper 4. On the other hand, as shown in FIG. Rotate, slider 1 will move away from stopper 4. In this case, when the frictional force of the upper contact surface 5b exceeds the frictional force of the lower contact surface 5a, the slider 1 pressed against the stopper 4 will move from the stopper 4 as the clamp bolt 15 is screwed in. The actuator 4 is separated, so that the positioning accuracy cannot be ensured.

In addition, the frictional force generated on the contact surfaces 5 a and 5 b of the head 5 is also affected by the surface roughness of the abutment surfaces 5 a and 5 b , and also by the torque load applied to the clamp bolt 15 . That is, the method of applying torque to the clamping bolt 15 is usually to apply a rotational force by pressing from one side after fitting a cantilever wrench into the bolt, but at this time, the pressing force is applied to the head 5 of the clamping bolt 15 . The pressing force will cause the clamping bolt 15 to deflect. When the hexagonal wrench is horizontally fitted with the clamping bolt 15 shown in FIG. A force F is exerted downwards on the head 5 of the clamping bolt 15 . Accordingly, the clamp bolt 15 bends downward, and under the influence of this, the contact surface 5 a of the head 5 is further pressurized. Or conversely, when the wrench is fitted in such a way that the force-applying part is located on the left side of the head 5 of the clamping bolt 15, and the clamping bolt 15 is rotated to the right (the direction of the force is upward), the force applied to the slider 1 is reversed. The movement force of is strengthened to the left.

On the other hand, according to the present invention, the height difference t is provided to such an extent that it will not be affected even if the above-mentioned force F is applied, so that when the clamp bolt 15 is tightened, the moving force applied to the slider 1 can always be determined in a certain direction. That is, in the direction towards the stopper 4 . Therefore, by tightening the clamp bolts 15 , the slider 1 can be fixed on the slide base 2 and pressed against the stopper 4 reliably.

In addition, although the case where the adjustment hole 6 is elongated was demonstrated, when the movement amount of the slider 1 can be small, it may be a circular hole with some margin. Furthermore, although the value of the height difference t when the end surface of the slide base 2 is aligned with the clamp fitting 3 is set as a rough value, it goes without saying that it can be adjusted according to the size or movement amount of the clamp bolt 15, the material and rigidity of the clamp fitting, or Size etc. are subject to change as appropriate.

Claims (8)

1. A clamping mechanism comprising: a block with a threaded hole, and a clamping bolt with a head mounted in the threaded hole of the block by a clamping fitting, The clamping fitting has an adjustment hole through which the clamping bolt passes, The surface of the clamping fitting on the side of the clamping bolt head includes the surface on the side of the adjustment hole that is in close contact with the head of the clamping bolt, and the other side of the adjustment hole that forms a gap with the head of the clamping bolt. face composition. 2. Clamping mechanism according to claim 1, characterized in that the block with the threaded hole is constituted by a slide movable on a slide base. 3. The clamping mechanism according to claim 2, wherein the adjustment hole of the clamping fitting is formed in an elongated shape, extending along the moving direction of the slider. 4. The clamping mechanism of claim 2, wherein the clamping fitting extends from the slide to the slide base. 5 . The clamping mechanism according to claim 4 , wherein a stepped portion between the slider and the slide base is formed on the surface of the slide block and the slide base of the clamp fitting. 6 . 6. The clamping mechanism according to claim 2, characterized in that: a dovetail groove is provided on one of the sliding base and the slider, and a dovetail groove guide engaging with the dovetail groove is provided on the other. pieces. 7. The clamping mechanism according to claim 1, wherein the adjustment hole of the clamping fitting is a round hole. 8 . The clamping mechanism according to claim 1 , wherein the center of the adjustment hole coincides with the boundary line between the surface on one side of the adjustment hole and the surface on the other side of the adjustment hole.

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