JPH0658260U - Ball chuck for wire - Google Patents

Abstract

(57) [Summary] [Purpose] In a ball chuck for wires, in which a ball for gripping a wire, a holder for the ball, and a spring for urging and moving the holder are provided in the case, the spring receiving structure on the case side is improved. By doing so, the reliability is improved while the structure is simpler, and the overall manufacturing cost is reduced. [Structure] A cylindrical thin portion 10 is integrally formed in a lower end opening of a floating wall 7 connected to a tapered wall 6 in a case 1. From the opening side of the thin portion 10, the holder 2 loaded with the balls 3 and the spring 4 are assembled. After that, the thin portion 10 is plastically deformed toward the cylinder center of the case 1 to form the receiving wall 18. The receiving wall 18 holds the spring 4 so that it cannot fall off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a ball chuck for a wire that uses a ball as a gripping element, and is an improvement in how to receive a spring incorporated in a case.

[0002]

[Prior art]

 This type of ball chuck consists of several balls, a holder that holds the balls, a cylindrical case into which the holder is inserted, and a spring that urges the holder to move toward the tapered surface inside the case. It is configured. There are several forms for enclosing the spring in the case. For example, in Japanese Utility Model Laid-Open No. 61-150546, a spring washer having a toothed washer is press-fitted and fixed in a case to receive one end of the spring. There is also a type in which a ring-shaped plug body is fitted in and fixed to a case instead of a washer-shaped spring receiver (Japanese Utility Model Laid-Open No. 61-193246). Further, in Japanese Utility Model Publication No. 1-29307, a crown-shaped cap is externally fitted and fixed to the end of the case.

[0003]

[Problems to be solved by the device]

 The toothed washer-shaped spring bearing may slip in the case or fall off from the case during use, leaving uncertainties about its reliability. In this regard, the latter two members fix the stopper and the cap to the case by caulking, so the spring bearing can be fixed more firmly than the toothed washer-shaped spring bearing. However, when the ring-shaped plug is press-fitted and fixed, there is a problem in that the peripheral surface of the case expands and deforms when the thickness of the case is thin. For example, when a screw is formed on the peripheral surface of the case, the screw diameter changes and screwing becomes impossible. Further, when the cap is externally fitted and fixed to the peripheral surface of the case, it is necessary to crimp the opening edge in the radial direction, and the crimping process is troublesome, which is not suitable for mass production. Compared to the toothed washer-shaped spring bearing described above, extra costs are required for turning and crimping the cap, and the overall manufacturing cost of the ball chuck is high.

Therefore, an object of the present invention is to ensure a high degree of reliability, and to enclose the spring in the case with a simpler structure, which is excellent in mass productivity and can reduce the manufacturing cost as a whole. To provide.

[0005]

[Means for Solving the Problems]

 The ball chuck of the present invention comprises a cylindrical case 1 having an inner surface formed with a tapered wall 6 and a floating wall 7 continuous with the large diameter end of the tapered wall 6, a wire hole 16 and a ball hole 17 intersecting each other. And a ball 3 loaded in a ball hole 17 of the holder 2, and a holder 2 mounted in the case 1 to move the holder 2 to the tapered wall 6. And a spring 4 for urging and moving it toward. A receiving wall 18 for receiving one end of the spring 4 is provided integrally with the case 1 at the opening of the floating wall 7. A thin portion 10 is formed at the open end of the case 1, and the receiving wall 18 is formed by plastically deforming the thin portion 10 toward the cylinder center of the case 1. Specifically, one end of the spring 4 is received by the receiving wall 18 via the washer 5, and the screw 11 is formed on the outer surface of the end of the case 1 on the receiving wall 18 side.

[0006]

[Action]

 The receiving wall 18 is formed by plastically deforming the thin portion 10 at the end of the case 1 toward the center of the cylinder. At this time, since the thin portion 10 having a smaller wall thickness than the other parts of the case 1 is caulked and machined, the shape change of the case 1 due to the deformation can be well prevented, and especially the end of the case 1 on the receiving wall 18 side. Even when the screw 11 is formed on the outer surface of the part, the screw 11 is not deformed.

[0007]

[Effect of device]

 In the present invention, the receiving wall 18 for the spring 4 is formed by caulking the thin portion 10, so that the receiving wall is in use during use as compared with the conventional spring receiving structure in which an independent component such as a toothed washer is attached to the case. It is possible to eliminate the misalignment of the position of 18 and the dropping of the case 1, and to improve the reliability. The number of members can also be reduced. Since the thin wall portion 10 provided at one end of the case 1 is swaged to the center of the cylinder to perform the caulking process to form the receiving wall 18, it is easier than when the opening edge of the cap fitted on the case is swaged. Moreover, swaging can be performed quickly. There is no case deformation that cannot be avoided when pressing the ring-shaped plug into the case. Therefore, it is possible to obtain a ball chuck having a simpler structure and exhibiting a high degree of reliability. Further, the caulking process at the time of assembly can be easily performed, and the ball chuck as a whole can be manufactured inexpensively and efficiently.

[0008]

【Example】

 In FIG. 2, the ball chuck comprises a case 1 and a holder 2 each made of a copper alloy, a steel ball 3 held by the holder 2, a compression coil type spring 4 and a washer 5.

The case 1 is formed in a tubular shape with both upper and lower ends open, and has a downwardly extending tapered wall 6 on its inner surface and a floating wall 7 continuous with the large diameter end of the tapered wall 6. On the outer surface of the case 1, a knurled head portion 8 and a mounting portion 9 on which a screw 11 is formed are provided. A thin portion 10 for forming the receiving wall 18 of the spring 4 is formed in a cylindrical shape so as to be continuous with the lower end of the mounting portion 9. However, the outer diameter of the thin portion 10 is set smaller than the diameter of the root portion of the screw 11. This is to prevent the screw 11 from being deformed when the thin wall portion 10 is plastically deformed toward the center of the cylinder to form the receiving wall 18.

The holder 2 has an operation portion 13, a ball holding portion 14, and a spring receiving portion 15 from above, and a wire through hole 16 is provided along the axial center of the holder 2. Ball holes 17 communicating with the wire through holes 16 are provided at three peripheral surfaces near the lower end. The ball holding portion 14 is formed in a downwardly expanded shape with the same tapered surface as the tapered wall 6 on the inner surface of the case 1. The holder 2 is assembled in the case 1 with the balls 3 loaded in the ball holes 17. One end of the spring 4 is fitted onto the spring receiving portion 15 of the holder 2, and the other end of the spring 4 is received and supported by the receiving wall 18 via the washer 5 as shown in FIG. As a result, the entire holder 2 is urged to move toward the tapered wall 6, and the operation portion 13 thereof projects from the upper end of the case 1.

In FIG. 3, the receiving wall 18 is formed by assembling the holder 2, the spring 4, and the washer 5 in the case 1 and then caulking the thin portion 10 of the case 1 with the caulking tool 19 toward the center of the cylinder. To form. Specifically, the tip of the thin portion 10 is relatively strongly pressed against the caulking groove 20 of the crimping tool 19, and the entire thin portion 10 is bent toward the inner surface of the cylinder. According to this caulking mode, the receiving wall 18 can be formed only by applying a caulking force in the axial direction to the thin portion 10, so that the caulking process can be easily performed. Further, since the thin portion 10 integrated with the case 1 is bent to form the receiving wall 18, higher reliability can be obtained as compared with the case where other components are integrated with the case. When forming the receiving wall 18, the portions other than the thin portion 10 are not deformed.

The ball chuck configured as described above is used by passing the wire 21 through the wire through hole 16 of the holder 2 as shown in FIG. For example, when fixing the wire 21 in a tensioned state, the mounting portion 9 of the case 1 is screwed into a bracket fixed to the floor or wall surface. When the ball chuck is used as a lifting tool, a hook separately provided on the mounting portion 9 is fastened and fixed with a nut. When the operating portion 13 is pushed into the case 1 against the spring 4, the gripped state of the ball 3 can be released.

The washer 5 can be omitted, although it depends on the protruding amount of the receiving wall 18. The screw 11 of the mounting portion 9 may be omitted depending on the usage of the ball chuck. The thin-walled portion 10 may be formed of a cylindrical wall, or may be formed by dividing the cylindrical wall into a plurality of pieces in the circumferential direction.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a ball chuck.

FIG. 2 is a front view showing a state in which the components of the ball chuck are separated.

FIG. 3 is an explanatory diagram showing a formation state of a receiving wall.

[Explanation of symbols]

 1 Case 2 Holder 3 Ball 4 Spring 5 Washer 6 Tapered Wall 7 Floating Wall 10 Thin Wall 11 Screw 16 Wire Through Hole 17 Ball Hole 18 Receiving Wall

Claims (2)

[Scope of utility model registration request] 1. A cylindrical case 1 having an inner surface formed with a tapered wall 6 and a floating wall 7 continuous with the large diameter end of the tapered wall 6, and a wire passage hole 16 and a ball hole 17 intersecting each other. The holder 2 is installed in the case 1 so as to be movable in the axial direction, the ball 3 installed in the case 1 and loaded in the ball hole 17 of the holder 2, and the holder 2 is moved toward the tapered wall 6. And a spring 4 for biasing movement, and a receiving wall 18 that receives one end of the spring 4 at the opening of the floating wall 7.
Is integrally formed with the case 1, and the receiving wall 18 is formed by plastically deforming the thin portion 10 provided at the opening end of the case 1 toward the cylinder center side of the case 1. Ball chuck for wire. 2. One end of the spring 4 is provided with a washer 5 via a washer 5
The ball chuck for a wire according to claim 1, further comprising a screw 11 formed on the outer surface of the end of the case 1 on the side of the receiving wall 18 of the case 1.