JP3168407B2 - 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 in which a plurality of balls are supported by a pair of ball holders.

[0002]

2. Description of the Related Art This type of slide clamper has an actual opening 4 mm.
Japanese Patent Application Laid-Open No. 114154/1989 discloses a method in which a pair of ball holders are arranged in a cylindrical case so as to face each other, a plurality of balls having a diameter of several mm are arranged between the two ball holders, and each holder is brought closer to each other by a spring. , So that the ball can be held at a fixed position in an annular array.

[0003]

In the slide clamper described above, a group of balls is held between a pair of ball holders only by the pressing force of a spring. Moreover, the diameter of the shaft gripped and fixed by the group of balls is sufficiently larger than the diameter of the balls. Therefore, there is no problem when the shaft to be clamped is inserted into the clamper, but it is difficult to hold the ball stably when the shaft is separated from the clamper. For example, when a large external force or impact force acts on the slide clamper in the shaft separated state, the pressing force of the spring is loosened, or the ball moves between a pair of ball holders, and the ball falls into the space for shaft insertion. I will. If even one ball falls off, extra work is required to disassemble the entire slide clamper and reassemble it. Therefore, when the slide clamper is transferred or delivered in a separated state, great care is required. Therefore, it is required to ship the product with the dummy shaft loaded, which requires extra labor and cost.

An object of the present invention is to provide a slide clamper which can reliably prevent a ball from dropping from a proper holding position or falling into a shaft insertion hole. Another object of the present invention is to provide a slide clamper that can reliably prevent a ball from falling off from a regular holding position in a shaft separated state, and can therefore easily handle packaging and transfer.

[0005]

A slide clamper according to the present invention includes a pair of ball holders 2 in a cylindrical case 1.
・ 3 is slidably opposed along the case axis,
A plurality of balls 4 made of a magnetic material are arranged in an annular array between opposing surfaces of the ball holders 2 and 3. Each ball holder 2 ・ between the case 1 and each ball holder 2 ・ 3
The first spring 5 and the second spring 5 for urging the ball 3 toward the ball 4
The spring 6 is arranged. A tapered surface 12 for moving the ball 4 toward the case axis is provided on the inner surface of the case 1. The tension of the first spring 5 that presses the ball 4 toward the tapered surface 12 is set to be larger than the tension of the second spring 6. Thus, at least one of the ball pressing portions P1 and P2 of the ball holders 2 and 3 is formed by the magnet 15.

A hole 2a for allowing the shaft 7 fixed by the ball 4 to pass therethrough is inserted into each of the ball holders 2 and 3.
3a is provided, and the diameter of the holes 2a and 3a is set to be larger than the diameter of the ball 4. Then, the ball 4 is inserted into at least one of the inner edges of the ball pressing portions P1 and P2 of the ball holders 2 and 3 with the shaft insertion holes 2a and 3.
Receiving walls 16 and 20 for preventing entry into a are protruded.

[0007]

Since the group of balls 4 is formed of a magnetic material and at least one of the ball pressing portions P1 and P2 of the ball holders 2 and 3 is formed of the magnet 15, the balls 4 are pressed by the tapered surface 12. In the shaft separation state, the ball 4 can be prevented from being separated from the ball holders 2 and 3 by an external force by the magnetic attraction force of the magnet 15 while allowing the ball 4 to move toward the case axis. Compared to a conventional slide clamper, the ball 4 can be more strongly sandwiched and held by the magnetic attraction force of the magnet 15 in addition to the spring tension when the pair of springs 5 and 6 are balanced.
If the receiving walls 16 and 20 protrude from at least one of the inner edges of the ball pressing portions P1 and P2, even if a strong external force exceeding the magnetic attraction force of the magnet 15 is applied, the ball 4 can be used as a shaft. It is possible to prevent the receiving walls 16 and 20 from dropping into the holes 2a and 3a that allow the insertion of the receiving member 7.

[0008]

1 to 4 show an embodiment of a slide clamper according to the present invention. In FIG. 1, a slide clamper includes a vertically long cylindrical case 1 in which a pair of upper and lower ball holders 2 and 3 are arranged to face each other, and a ball 4 having a group of 7 balls is formed between the opposing surfaces of the ball holders 2 and 3. A first spring 5 and a second spring 6 are arranged between the case 1 and each of the ball holders 2 and 3 to press and urge each of the ball holders 2 and 3 toward the ball 4. Become. Reference numeral 7 denotes a shaft made of a shaft or a wire clamped and fixed by a slide clamper.

In FIG. 2, the case 1 comprises a bottomed cylindrical case body 9 and a plug 10 which is screwed and fixed to the inner surface of the cylindrical opening of the case body 9.
0, an insertion hole 11 for the ball holder 3,
A hole 10a through which the shaft body 7 can be inserted is provided. A tapered surface 12 extending toward the plug 10 is provided in the middle part of the inner surface of the case body 9. The group of balls 4 can be moved toward the case axis by the tapered surface 12.

The lower ball holder 2 includes a sleeve 14 having a flange 13 protruding from a peripheral surface near the upper end, and a ring-shaped magnet 1 externally fixed to a cylindrical shaft portion on the upper surface of the flange 13.
And 5. The sleeve 14 is provided with holes 2a that allow the shaft 7 to be inserted vertically. The magnet 15 is magnetized so that the upper and lower surfaces form an N pole and an S pole.
Adhesively fixed. By arranging the magnet 15 on the upper end of the sleeve 14 in this manner, the upper surface of the magnet 15 is always in contact with the group of balls 4 and forms the ball pressing portion P1 of the lower ball holder 2. A receiving wall 6 projecting upward from the upper surface of the magnet 15 is provided at an upper end of the cylindrical shaft portion on the flange 13.
Is provided. The receiving wall 16 is formed to taper upwardly, but in a state where the ball 4 is pressed by the tapered surface 12 to clamp and fix the shaft 7 as shown in FIG. Are formed so that a slight margin e is generated between them. Between the lower surface of the flange 13 and the inner bottom of the plug 10, a compression coil type first spring 5 is mounted so as to be externally fitted to the peripheral surface of the sleeve 14.

The upper ball holder 3 comprises a cylindrical shaft body 18 having a ball pressing portion P2 having a larger diameter at the lower end, and an operation ring 19 screwed and fixed to the upper end of the cylindrical shaft body 18. A hole 3a for the shaft body 7 is provided along the axis of. The lower end surface of the ball pressing portion P2 is always in contact with the group of balls 4 and cooperates with the lower ball holder 2 to sandwich and hold the balls 4. As shown in FIG. 1, the ball pressing portion P2
A receiving wall 20 having the same meaning as the receiving wall 16 protrudes downward near the lower end inner edge. The compression coil-shaped second spring 6 is disposed between the upper step portion of the ball pressing portion P2 and the upper end wall of the case body 9 so as to be fitted on the peripheral surface of the cylindrical shaft body 18. The upper part of the cylindrical body 18 protrudes above the case body 9 through the insertion hole 11.

The upper and lower ball holders 2 and 3 are moved and urged by respective springs 5 and 6 in opposite directions to each other, so that a group of balls 4
From above and below. In order to constantly press the ball 4 against the tapered surface 12 while maintaining this relationship, the tension of the first spring 5 is set to be larger than the tension of the second spring 6. The group of balls 4 is a sphere made of a magnetic metal typified by a steel ball, and is always attracted and held by a magnet 15. The diameter of the holes 2a and 3a provided in each of the ball holders 2 and 3 is set to be larger than the diameter of the ball 4. The case body 9, the plug 10, the sleeve 14, the cylindrical shaft 18, and the operation ring 19 are each made of a metal-turned product, and are formed of, for example, a stainless steel material or a copper alloy.

The above components are assembled in the following procedure.
With respect to the case body 9, the second spring 6
After the cylindrical shaft 18 is passed through the second spring 6 and the insertion hole 11 in order, the operation ring 19 is screwed and fixed to the upper end of the cylindrical shaft 18 protruding outside the case body 9. Next, the shaft 7
Then, a dummy shaft having the same diameter as that described above is inserted into the cylindrical shaft body 18, and seven balls 4 are dropped between the dummy shaft (shaft body 7) and the case body 9. Further, the lower ball holder 2 and the first spring 5 are loaded into the case body 9 from below, and the plug 10 is screwed into the case body 9 to complete the assembly.

When the dummy shaft is removed in the above-mentioned assembly completed state, the ball 4 is pushed by the tapered surface 12 and moves toward the case axis, and the ball holders 2 and 3 move the ball 4 toward the small diameter end of the tapered surface 12. Move to. Finally, as shown in FIG. 3, both ball holders 2 and 3 are received and held with the second spring 6 fully compressed. At this time, the group of balls 4 is also attracted and held by the magnet 15. Further, each ball 4 is provided with a receiving wall 16.2 provided on both ball holders 2.3.
0 restricts movement in the case axis direction.
Therefore, even if a strong external force such as a drop impact acts on the case 1,
The balls 4 can be reliably prevented from rolling down into the holes 2a and 3a. Even in the shaft separated state where the dummy shaft has been removed, the group of balls 4 is held in a normal state and is handled during subsequent packaging and transport. Becomes easier.

In use, the slide clamper is mounted on the shaft body 7 as shown in FIG. In this loaded state, assuming that the shaft body 7 is fixed, the slide clamper can slide freely to the upper arrow L side, but cannot move in the reverse downward direction. However, when the upper ball holder 3 is pushed into the case body 9 against the spring force of the first spring 5 via the operation ring 19, the clamping force by the ball 4 is released, so that the slide clamper moves the arrow L. The slide operation can be freely performed in any direction of the side and the opposite side.

FIG. 5 shows another embodiment of the slide clamper, in which a ball pressing portion P2 of the upper ball holder 3 is provided.
Also, the magnet 15 is arranged so that the drop of the ball 4 can be prevented more reliably. In this case, the receiving walls 16 and 20 can be omitted.

In addition to the above embodiment, a part of the lower ball holder 2 is protruded out of the plug 10 and the operation ring 19 is fixed to this protruding portion. It may be possible to release the clamping force of the ball 4 by performing a withdrawal operation. The magnet 15 does not need to be formed in a ring shape. For example, a plurality of small-diameter disc-shaped magnets 15 can be embedded in the ball pressing portions P1 and P2 to hold the ball 4 by suction. The ball holder of the present invention can appropriately hold the position of the ball 4 particularly in a slide clamper having a ball diameter of several mm or less.

[0018]

According to the present invention, a pair of ball holders 2
The magnet 1 is attached to at least one of the ball pressing portions P1 and P2
5, the ball 4 can be held in position by the magnetic attraction force of the magnet 15 in addition to the holding force between the pressing portions P1 and P2. Therefore, even in the shaft separated state in which the shaft body 7 is removed from the case 1, the ball 4 that has received a drop impact or the like is reliably prevented from rolling down into the holes 2a, 3a of the holders 2, 3, and 4 can be held in a regular annular array. Thereby, handling of the assembled slide clamper can be simplified.

Since the balls 4 are received by the receiving walls 16 and 20 provided at the inner edges of the ball pressing portions P1 and P2, and the balls 4 are prevented from rolling into the holes 2a and 3a of the holders 2.3, the magnet 15 Even when a strong external force exceeding the magnetic attraction force is applied, the ball 4 can be more reliably prevented from falling into the holes 2a and 3a.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view.

FIG. 2 is an exploded perspective view.

FIG. 3 is a longitudinal sectional view of a main part in a shaft separated state.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is a longitudinal sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2.3 Ball holder 4 Ball 5 1st spring 6 2nd spring 12 Tapered surface 15 Magnet 16.20 Receiving wall P1, P2 Ball pressing part

Claims (3)

(57) [Claims] A pair of ball holders are slidably disposed along the axis of the case in a cylindrical case, and a magnetic material is provided between the opposing surfaces of the ball holders. A plurality of balls 4 formed in the above are arranged in an annular array, and between the case 1 and each of the ball holders 2, 3, each ball holder 2.3 is moved and biased toward the ball 4. 1
A spring 5 and a second spring 6 are disposed. A tapered surface 12 for moving the ball 4 toward the case axis is provided on the inner surface of the case 1, and the ball 4 is pressed toward the tapered surface 12. The tension of the first spring 5 on the side of the slide clamper is set to be greater than the tension of the second spring 6, and at least one of the ball pressing portions P1 and P2 of both ball holders 2.3 is magnet. A slide clamper characterized by being formed with a slide clamp. 2. Each of the two ball holders 2 and 3 has:
Hole 2 that allows shaft 7 to be clamped and fixed by ball 4
2. The slide clamper according to claim 1, wherein a.3a is provided, and the diameter of the holes 2a.3a is set larger than the diameter of the ball 4. 3. A receiving wall 16 for preventing at least one of the inner edges of the ball pressing portions P1, P2 of the ball holders 2, 3 from entering the shaft insertion holes 2a, 3a. The slide clamper according to claim 2, wherein 20 is protruded.