JP2532576Y2 - Slide clamper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide clamper using a ball chuck type chuck as a clamp element.

[0002] A chuck device of the ball chucking type is
For example, it is known from Japanese Utility Model Publication No. 1-4178. The chuck device includes an outer cylinder having a tapered surface formed at an inner lower end, a ball holding cylinder inserted vertically into the outer cylinder, a wire (or a round shaft) vertically penetrating the ball holding cylinder,
A spring for urging the ball holding cylinder toward the tapered surface, wherein a plurality of chucking balls are movably held in a radial direction at a portion facing the tapered surface of the ball holding cylinder. is there. In a normal state, each ball comes into contact with the tapered surface and is prevented from moving outward in the radial direction, and holds the wire inside the ball. In this state, the wire and the outer cylinder cannot be moved in a direction in which they are separated from each other, but they can be relatively moved to a side where they approach each other. Further, when the ball holding cylinder is pushed into the outer cylinder against the spring, the restraint of the ball by the tapered surface is released, so that the wire and the chuck device can be relatively moved in any of the pushing and pulling directions.

[0003]

[Problem to be solved by the invention]
It is mainly used for suspending and supporting heavy objects. For example, a 1.5 mm diameter wire consisting of stranded wire is replaced with a 3 mm ball diameter.
3-4 steel balls. The suspension load is about 50 to 200 kg. As described above, in the case of the chuck device used as a hanging device, the size of the load limit that can be borne and the ease of chuck release operation are regarded as important in determining the specification, and it is not considered that the chucking position accuracy is considered. Few. For example, when a wire is to be chucked, a wire movement of several mm is observed from the time when the burden is applied to the time when the ball bites into the wire peripheral surface.

In order to improve the accuracy of the chucking position and further reduce the overall size, it is effective to reduce the diameter of the ball. For example, when the ball diameter of the ball is reduced to 1 to 1.5 mm, the amount of play when the ball bites can be reduced. This is because the pinching surface pressure of the ball increases. Further, when a round shaft is used in place of the wire, the deformation of the holding portion due to the biting of the ball can be eliminated, so that the play amount can be further reduced. However, in the conventional chuck device, a holding groove is radially provided in a ball holding cylinder, and each ball is housed in the holding groove. Therefore, as the ball diameter becomes smaller, the processing of the holding groove becomes more difficult, and the processing cost increases.

The present inventor has considered reducing the processing cost of the ball holding cylinder by changing the ball holding structure. The portion corresponding to the holding groove is omitted, and the ball is pressed against the tapered surface by the end wall of the ball holding cylinder. At least, it has been confirmed that chucking can be performed without any trouble even when there is no holding groove in a state where the round shaft moves in and out in the vertical direction. However, a problem has arisen when the chuck is used in a horizontal position. When the ball holding cylinder is moved away from the tapered surface against the spring,
Until then, the balls arranged in an annular shape roll under their own weight and are sandwiched between the end wall of the ball holding cylinder and the tapered surface.

This invention uses a chuck using a small-diameter ball as a clamp element of a slide clamper to achieve a compact slide clamper and an improvement in clamp position accuracy by improving a ball holding structure. An object of the present invention is to eliminate restrictions on the use posture and reduce processing costs.

[0007]

The slide clamper according to the present invention comprises a round shaft 1, an outer cylinder 2 and a sleeve 3 which are externally fitted to the round shaft 1 and are connected to each other in a certain range so as to be freely inserted and removed. A sleeve 3 provided on one end side of the inner surface of the cylinder 2
Tapered surface 11 expanding toward the side of
Ball pressing wall 13 provided at the end of the side sleeve 3
And a plurality of small-diameter balls 4 arranged annularly in a space surrounded by the round shaft 1 and biasing the sleeve 3 housed in the outer cylinder 2 toward the side approaching the tapered surface 11. Compression spring 6, a clamp releasing operation piece 14 provided at a protruding end of the sleeve 3 protruding from the outer cylinder 2, and a relative movement to the round shaft 1 in a state of facing the ball pressing wall 13. And a compression coil-shaped holding spring 7 housed in the outer cylinder 2 to move and bias the ball holding member 5 toward the small-diameter ball 4. It is required that the tension of the clamp spring 6 is set to be larger than the tension of the holding spring 7. Preferably, an inclined surface 18 that guides the small-diameter ball 4 toward the centripetal direction is formed on the contact surface of the ball holding member 5 with the small-diameter ball 4.

[0008]

The small-diameter ball 4 is sandwiched between the sleeve 3 and the ball holder 5, and the sleeve 3 is always biased to move in the opposite direction by the clamp spring 6 and the ball holder 5 by the holding spring 7. Accordingly, when the sleeve 3 is released from the clamp against the clamp spring 6, the ball holder 5 is moved in accordance with the amount of the movement, and the small-diameter ball 4 is pinched and held in cooperation with the sleeve 3 to form an annular arrangement. maintain. As described above, in the ball holding structure in which the small-diameter ball 4 is sandwiched and held between the sleeve 3 and the ball holding body 5, the annular arrangement of the small-diameter ball 4 can be maintained even when the clamp is released. But clamping can be done without any trouble. Processing of the sleeve 3 for holding the small-diameter ball 4 and the ball holder 5 can be facilitated as compared with the case where a radial holding groove is provided in the sleeve 3.

[0009]

According to the slide clamper of the present invention, the small-diameter ball 4 is sandwiched between the opposing sleeve 3 and the ball holder 5 in the outer cylinder 2, and the sleeve 3 and the ball holder 5 are clamped by the clamp spring 6 and the holding spring 7. By moving and biasing in the opposite direction, the small-diameter ball 4 always accompanies the sleeve 3 and the ball holder 5 so that the annular arrangement can be maintained. Therefore, while the size of the slide clamper can be reduced and the accuracy of the clamping position can be improved by using the small-diameter ball 4, the processing cost of the sleeve 3 and the ball holder 5 is smaller than that in the case where the ball is held by radial grooves. , And the versatility of the slide clamper can be improved by eliminating the restrictions on the posture when using the slide clamper.

[0010]

1 to 5 show an embodiment of a slide clamper according to the present invention. In FIG. 1, a slide clamper includes a round shaft 1, an outer cylinder 2 and a sleeve 3 which are externally fitted to the round shaft 1 and are connected to each other in a certain range so as to be freely inserted and removed, and a slide clamper 7 is accommodated in the outer cylinder 2. Small balls 4
A ball holder 5 for holding the small-diameter ball 4 in cooperation with the sleeve 3 and a clamp spring 6 for urging the sleeve 3 and the ball holder 5 to move in opposite directions to each other.
And a holding spring 7 and the like.

The outer cylinder 2 comprises a cylinder main body 2a and a plug 2b screwed into the cylinder main body 2a. An insertion hole 9 for the round shaft 1 is formed in an end wall of the cylinder main body 2a, and an insertion hole 9 for the sleeve 3 is inserted in an end wall of the plug 2b. Holes 10 are respectively formed. Inside the cylinder body 2a,
A tapered surface 11 extending toward the sleeve 3 and a spring receiving hole 12 are provided adjacent to each other. The sleeve 3 has a cylindrical shaft with a flange protruding at one end. The cylindrical shaft is inserted from the inside into the insertion hole 10 of the plug 2b, and protrudes to the outer surface. A compression coil type clamp spring 6 is mounted between the upper surface of the flange of the sleeve 3 and the plug 2b.

The small-diameter ball 4 is a steel ball having a ball diameter of 1.5 mm. The small-diameter ball 4 is formed in a space surrounded by the tapered surface 11, the ball pressing wall 13 at the lower end of the sleeve 3, and the peripheral surface of the round shaft 1. They are arranged in a ring as shown in FIG. As described above, the sleeve 3 that has been moved and urged by the clamp spring 6 presses a group of small-diameter balls 4 toward the spring receiving hole 12 via the ball pressing wall 13 so that the outer surface of the small-diameter ball 4 has a tapered surface. 11
And the inner surface is kept in contact with the round shaft 1 at the same time.
In this clamped state, the round shaft 1 cannot be pulled out from the inside of the outer cylinder 2 toward the spring receiving hole 12, but can be freely moved in the opposite direction.

In order to release the clamped state, the operating piece 14 is screwed into the protruding end of the sleeve 3 on the outer surface of the plug. The operation piece 14 is a turned product in which a circular finger hook portion 15 is protruded at the upper end of the screw cylinder. When the operation piece 14 is moved to the side away from the plug 2b against the clamp spring 6 as shown in FIG. The state can be released. In order to maintain the annular arrangement of the small-diameter ball 4 even when the clamp is released, the ball holder 5 is opposed to the ball pressing wall 13 of the sleeve 3.
This is biased to move toward the sleeve 3 by a compression coil type holding spring 7 whose one end is fitted into the spring receiving hole 12. The ball holder 5 is formed in a circular seat plate shape, and has a hole 17 at the center of the plate surface fitted outside so as to be relatively movable with respect to the round shaft 1. An inclined surface 18 having a concave arc shape is formed on the surface wall on the side in contact with the small-diameter ball 4, and the inclined surface 18 and the ball pressing wall 13 cooperate to sandwich and hold a group of small-diameter balls 4. ing.

In the clamp release state shown in FIG. 3, the ball pressing wall 13 of the sleeve 3 is located near the upper end of the tapered surface 11, and the diameter of the tapered surface 11 at this position is different from that of the round shaft 1 in the radially opposed position. Is larger than the sum of the radial dimensions of the two or three small-diameter balls 4. Therefore, the small-diameter ball 4 can basically move radially outward. However, the lower half peripheral surface is the inclined surface 1 of the ball holder 5.
8, the small-diameter ball 4 does not move outward in the radial direction, and always maintains a state of circumscribing the round shaft 1. That is, the inclined surface 18 is provided to guide the small-diameter ball 4 to move in the centripetal direction. The above members are assembled in the following procedure. The round shaft 1 is inserted into the cylinder main body 2a, and the holding spring 7 and the ball holder 5 are sequentially assembled into the cylinder main body 2a. In this state, the small-diameter ball 4 is dropped into the cylinder main body 2a and positioned in an annular shape. Next, the sleeve 3 and the clamp spring 6 are assembled in order, and the plug 2b is screwed into the cylinder main body 2a, so that the above-mentioned members are housed in the cylinder main body 2a. Finally, the operation piece 14 is attached to the sleeve 3.

FIG. 4 shows a pair of tweezers 20 using the slide clamper as a positioning member. This tweezers 20 has a pair of legs 21 and 21 bent in an inverted V-shape. The round shaft 1 is inserted through the pair of legs 21 and 21, and the insertion end is connected to one leg 21. The end fitting 22 and the outer cylinder 2 define the leg opening limit of the legs 21. The legs 21 are always urged to move in the leg opening direction by a C-shaped spring 23 attached to the upper end thereof. The outer cylinder 2 can move freely to the side where the legs 21 are closed, but the movement in the opposite direction is restricted. Therefore, leg 2
By setting the degree of opening of 1 and 21 slightly wider than the width of the semiconductor chip 24, the semiconductor chip 24 can be quickly grasped by a slight leg opening operation. When increasing the width between the legs, the operation piece 14 is moved to a side away from the outer cylinder 2.

The inclined surface 18 provided on the ball holder 5 can be formed by a tapered surface in the same direction as the tapered surface 11. When the slide clamper is used in a state where an external force is applied to the outer end surface of the plug 2b, a part of the ball holder 5 is projected to the outer surface of the outer cylinder 2 like the sleeve 3,
The clamped state can be released by pushing the protrusion into the outer cylinder 2.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a clamped state of a slide clamper.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a vertical sectional front view of the slide clamper in a clamp released state.

FIG. 4 is a perspective view of tweezers as an application example of the slide clamper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Round shaft 2 Outer cylinder 3 Sleeve 4 Small diameter ball 5 Ball holder 6 Clamp spring 7 Retention spring 11 Tapered surface 13 Ball pressing wall

Claims (2)

(57) [Scope of request for utility model registration] 1. A round shaft 1, an outer cylinder 2 and a sleeve 3 which are externally fitted to the round shaft 1 and are connected to each other in a predetermined range so as to be freely inserted and removed, and a sleeve provided on one end side of the inner surface of the outer cylinder 2. 3 and a ball pressing wall 1 provided at an end of the sleeve 3 on the taper surface 11 side.
3 and a plurality of small-diameter balls 4 arranged annularly in a space surrounded by the round shaft 1 and the sleeve 3 accommodated in the outer cylinder 2 and moved toward the side approaching the tapered surface 11. A biasing compression coil-shaped clamp spring 6, a clamp releasing operation piece 14 provided at a protruding end of the sleeve 3 protruding from the outer cylinder 2, and a relative to the round shaft 1 facing the ball pressing wall 13. A ball holder 5 fitted movably on the outside,
A compression coil-shaped holding spring 7 is provided in the outer cylinder 2 to urge the ball holder 5 toward the small-diameter ball 4. The tension of the clamp spring 6 is greater than the tension of the holding spring 7. A slide clamper that is set large. 2. The slide clamper according to claim 1, wherein an inclined surface for guiding the small-diameter ball 4 toward a centripetal direction is formed on a contact surface of the ball holding member with the small-diameter ball.