JPS6021577Y2 - one way chuck - Google Patents

Description

[Detailed description of the invention] The present invention relates to a one-way chuck that can firmly grip filaments such as wires and cables in one direction and allow them to pass freely in the opposite direction. .

Ball chucks are often used as one-way chucks, and the examples proposed by the present inventor are shown in Figures 1 to 4. 1 is a casing with a conical inner surface 2; The holder 3 is housed in the internal space.

The retainer 3 consists of a tapered part 5 having a conical outer surface 4 and a cylindrical part 6, and the tapered part 5 has three retaining holes 7 spaced apart by 120 degrees in a direction perpendicular to the axis. are provided, and one ball 8.8', 8' is housed in each, and the center of the holder 3 becomes a filament gripping space 9, which communicates with the outside through a slot 10.

The inner space of the casing 1 also communicates with the outside through the grooves 11.

A pin 12 is provided at the end of the tapered part 5 of the retainer 3, and a tension spring 13 is attached to the end, and the other end of the tension spring 13 is hung on a retaining ring 14, so that the retainer 3 is constantly pulled and the conical outer surface 4 is receiving a force such that it is in contact with the conical inner surface 2.

Reference numeral 15 indicates a mounting hole used when the one-way chuck is assembled into a frame such as a wire suspension machine, and reference numeral 16 indicates a filament such as wire or steel cable.

In actual use, when the filament 16 is inserted in the direction shown in FIG. 3A, the holder 3 is pushed in the insertion direction against the force of the tension spring 13, and the balls 8. 16
allow passage of.

When the filament 16 is then pulled in the direction B, the filament 16 is firmly gripped by the balls 8, 8', and 8'' due to the wedge action of the conical inner surface 2.

In this case, when a mere tension is applied to the filament 16, it is firmly gripped, but when a twisting force is applied to the filament 16, when the conical inner surface 2 is conical, the balls 8.8', 8. “rolls along the circumference.

Because of the pin 12, it does not roll continuously, but when it rolls over a certain range, the filament 16 and the balls 8°8', 8
“and roll against each other at their contact points.

If tension is applied at the same time, the contact points will move not only in the circumferential direction but also in the longitudinal direction in a screw-like trajectory, causing the problem that the filament 16 will gradually come off.

The object of the present invention is to eliminate these drawbacks and provide a one-way chuck that prevents the balls from moving in the circumferential direction, securely grips the filament, and is easy to handle.

The present invention includes a casing having a conical inner surface, and a holder housed inside the casing and having a tapered part at one end serving as an outer surface and a cylindrical part at the other end, and the casing and the holder. are each provided with a split groove over its entire length that communicates the inner space with the outside, and the holder has a linear gripping space in the central shaft portion that communicates with the split groove, and is movable in a direction perpendicular to the axis. A plurality of balls are held as much as possible, and the conical inner surface of the casing prevents the balls from moving in the circumferential direction to a position where the balls come into pressure contact with each other with the grooves of the casing and the holder matching. This is a one-way chuck characterized by having grooves along the generatrix line.

The present invention will be described with reference to the drawings as an embodiment. In FIG. 5, the conical inner surface 2 of the casing 1 is provided with shallow V-grooves 17 having a polygonal cross section as grooves along the generatrix line.

Split the filament 16 into such a one-way chuck, 1
When inserted from zero and tension is applied, the filament 16 is easily gripped by the balls 8.8', 8'' due to the longitudinal wedge action.

These balls 8.8', 8" are firmly pressed against the bottom of the V-groove 17, so even if the filament 16 tries to rotate, the balls 8.8', 8" hang down the slope of the V-groove 17. I can't roll because I can't.

Therefore, there is no relative displacement between the balls 8.8', 8'' and the filament 16, so that even if a rotational force is applied to the filament 16, it will not come out and can be firmly gripped.

FIG. 6 shows another embodiment in which the groove is an arcuate groove 18 having approximately the same radius as the radius of the ball 8° 8', 8'', and the effect is similar to that of the previous example.

The grooves may have any other shape as long as they prevent the balls 8.8', 8'' from shifting in the circumferential direction.

Furthermore, since the casing 1 and the holder 3 have grooves 10° and 11, they can be attached and removed at any position along the line 16.

In this case, when attaching and detaching, the holder 3 may be pushed against the tension spring 13 to free the balls 8.8', 8''.

The conical inner surface 2 of the casing 1 does not necessarily have to be a conical surface or a pyramidal surface with a straight generatrix, but also includes a conical surface with a curved generatrix as shown in FIG.

FIG. 7 shows an example having a conical inner surface 2 whose taper becomes gradually larger as the inner diameter becomes smaller.

In the conical inner surface 2 having such a shape, when the filament 16 to be gripped has a small diameter, the ball 8.degree. 8' comes into contact with a large part of the taper of the conical inner surface 2.

Generally, the gripping force due to the wedge action decreases as the taper increases, so the gripping force decreases as the filaments 16 increase and increases as the filaments 16 decrease.

If the filaments 16 are small, they are uniformly tapered, but if they remain as large as the gripping heel, the cross-sectional area will decrease at a large rate due to crushing due to contact pressure, and will easily cause breakage.

However, in the case of this embodiment, as the diameter of the filament 16 decreases, the gripping force naturally decreases, and with a gripping force appropriate to the diameter of the filament 16, the filament can be grasped reliably without fear of breakage.

The outer surface of the holder 3 does not necessarily have to be conical.

For example, those shown in FIGS. 7 and 8 are made from a hexagonal rod material.

Since it is somewhat difficult to drill the holding hole 7 on a cylindrical surface, a hexagonal bar is used as the material and the hole is drilled in a flat state and then processed into the desired shape.

The outer surface of the holder 3 does not necessarily have to come into contact with the conical inner surface of the casing 1.

When the balls 8.8', 8'' are attached, it is sufficient that the balls are in contact with each other without the filament 16.

According to the present invention, when the wire is inserted, the ball and the groove are aligned, so there is no transfer of the ball in the circumferential direction, and the split groove is in communication with the casing and the holder, so the rail-like shape is achieved. The mounting piece can also be fitted, and the cylindrical part led out of the casing serves as the lock release operation part, making it easy to adjust the movement on the filament, and it can be installed or removed at any position in the middle of the filament. It is possible to provide a one-way chuck that can be attached and detached with a single touch, and that even if twisting force is applied to the filament, there will be no circumferential transfer between the ball and the filament, and that the filament can be reliably and firmly gripped. Moreover, it is not complicated to handle, and its simplicity is extremely important in practical use.

[Brief explanation of the drawing]

Figures 1 to 4 show examples before the improvement according to the present invention; Figure 1 is a side view including the cross section taken along line I--I in Figure 2; ■Front view seen from the line, Figure 3 is a sectional view taken along the line ■-m in Figure 2, and Figure 4 is a cross-sectional view taken along the line 1.
5 and 6 are respectively two different embodiments of the present invention, and FIG. 7 is a cross-sectional view corresponding to the cross section taken along the line ■-■ in FIG. A sectional view of another embodiment, FIG. 8 is a front view of the holder viewed from the large diameter side. 1...Casing, 2...Conical inner surface,
3... Holder, 4... Conical outer surface, 5...
...Taper part, 6...Cylindrical part, 7...
...Retaining hole, 8.8', 8''...Ball,
9... Line gripping space, 10... Division groove, 11... Division groove, 12... Pin, 1
3... tension spring, 14... retaining ring, 15... mounting hole, 16... wire, 1
7...■groove, 18......circular groove.

Claims (1)

[Scope of utility model registration request] The casing has a casing having a conical inner surface, a holder having a tapered part at one end that is housed inside the casing and serving as an outer surface, and a cylindrical part led out from the casing at the other end, Each of the holders is provided with a split groove over its entire length that communicates between the inner space and the outside, and the holder has a linear gripping space in the central shaft portion that communicates with the split groove, and the shaft has A plurality of balls are held so as to be movable in the right angle direction, and a conical inner surface of the casing is provided with a circumferential direction at a position where the balls come into pressure contact with the grooves of the casing and the holder in alignment. A one-way chuck characterized by having grooves along the generatrix line to prevent transfer of the material.