JPS6299008A - Clamping fixture - Google Patents

Abstract

PURPOSE:To enable a tool to be tightened and removed also by strong torque, by providing a pair of cut surfaces or the second tightening manipulative part of tool insertion hole or the like in the tapered part of a rotary ring. CONSTITUTION:A tool 4 is mounted and removed by gripping a handle 3 by one hand while turning a rotary ring 2 by the other hand. Strong torque, when it is necessary for mounting the tool 4 to be removed, is obtained by using a tool A of wrench or the like or using a tool B like a drill bit for a pair of cut surfaces 26 or the second tightening manipulation part of a hole 27 left as provided in an external surface of a tapered part 21 in the rotary ring 2, and mounting and removal of the tool 4 by the strong torque can be attained.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a clamping device called a chuck that holds tools such as drill bits and driver bits, and in particular, to a device that allows attachment and detachment of tools without using a separate chuck handle. This is related to the tightening that is used.

[Background technology 1] When tightening and attaching tools using a chuck handle, it is easy to lose the chuck handle, and the tool cannot be attached or detached without the chuck handle. A device is provided that allows the tool to be attached and detached. This consists of a rotating ring that can freely rotate relative to the handle, a pawl support means that moves in the axial direction in conjunction with the rotation, and a tightening ring that is connected to the pawl support means so that it can freely move in the radial direction. When the rotary ring is rotated with fingers relative to the handle and the pawl moves in the axial direction together with the pawl support means, the tapered surface formed on the inner surface of the rotary ring The tool is attached and detached by moving the claws in the radial direction, but with conventional clampers of this type, attachment and detachment operations were performed using only the hands and fingers, which made removal difficult. In addition, it was not possible to handle cases where stronger tightening was desired.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to enable attachment and detachment of tools without the need for a chuck handle, and at the same time, to tighten with stronger torque. and to provide a tightening force that is also removable.

[Disclosure 1 of the Invention] However, the tightening device according to the present invention includes a shaft connected to a driving wheel, a handle fixed to the shaft,
A rotary ring rotatable relative to the handle, a pawl support means that moves in the axial direction by rotation of the rotary ring relative to the handle, and a tightening pawl connected to the pawl support means so as to be movable in the radial direction. , wherein the inner surface of the rotary ring is provided with a tapered surface that makes sliding contact with the outer surface of the claw, the gist being that at least one of the rotary ring or the handle is provided with a second tightening operation part, It is designed so that it can be tightened and removed using a separate tool.

The present invention will be described in detail below based on an embodiment of the illustrated drill chuck. In FIGS. 1 to 3, a metal shaft 1 connected to a drive wheel 10 has an irregular cross-section
1 is provided, and a cylindrical handle 3, which is a synthetic resin molded product and has a low left on its outer peripheral surface, is press-fitted and fixed to this irregular cross-section portion 11. The plurality of claws 5 that tighten the tool 4, which is a drill bit, all have sloped outer surfaces and have an L-shaped engagement piece 50 at the rear end. is engaged with an engagement groove 60 provided in a 70-tooth screw 6 serving as a pawl support means. The winter melon 5 is housed in a slit O formed in a conical metal core block 7, and the wing pieces 51 are engaged with the conical surface of the outer surface of the core block.

The rotating ring 2 includes a cylindrical portion 20 and a tapered portion 21 both made of a metal material such as high-speed tool steel, and a molded portion made of a non-metallic material such as synthetic resin or synthetic rubber and covering the outer surface of the cylindrical portion 20. 22, and houses the 70-tooth screw 6, core block 7, and a plurality of claws 5 inside.

A float screw 6 is screwed into a female screw 12 provided on the shaft 1.

Since the core block 7 is provided with a retaining portion for the rotating ring 2, when the rotating ring 2 is rotated relative to the handle 3, the core block 7, pawl 5, and float screw 6 rotate relative to the shaft 1. At this time, since the float screw 6 is screwed into the shaft 1, it moves in the axial direction. When this movement is directed forward, the winter melon 5 moves forward in the axial direction and gathers at the center due to the tapered surface of the inner surface of the tapered part 21 of the rotary ring 2. For this purpose, the tool 4 is tightened and fixed. Conversely, when the 70-tooth screw 6 moves backward, the winter melon 5 moves backward and simultaneously moves outward along the tapered surface of the core block 7 and leaves.

This tightening force configured as described above has the shaft 1
First, assemble the winter melon 5 using the 70-t screw 6, the core block 7, and the cylindrical part 20 of the rotating ring 2.
Then, the tapered part 21 is assembled to the cylindrical part 20 by means such as screw coupling, press fitting, or uneven coupling, and then a molded part 22 made of synthetic resin or synthetic rubber is molded on the outer surface of the cylindrical part 20, Furthermore, attach the handle 3 to the shaft 1
It can be assembled by fixing it in place.

The attachment/detachment of the tool 4 is performed by gripping the handle 3 with one hand and, in this state, gripping the rotating ring 2 with the other hand to rotate it. or when it is difficult to remove the tool 4 by rotating the rotary ring 2 with fingers, a pair of cut surfaces 26, 26 provided on the outer surface of the tapered portion 21 of the rotary ring 2.
Then, as shown in FIG. 4, the rotary ring 2 may be rotated relative to the handle 3 using a tool A such as a spanner or an adjustable wrench.

Instead of the cut surface 26, a hole 27 into which a tool B such as a drill bit can be inserted may be provided, as shown in FIG. Further, the second tightening operation portion consisting of the cut surface 26 and the hole 27 may be provided on the handle 3.
Furthermore, it may be provided on both the rotating ring 2 and the handle 3.

In the above embodiment, the accuracy of the concentricity between the cylindrical portion 20 and the tapered portion 21 in the rotary ring 2 is increased by providing a spigot portion 25 at the joint portion between the two.

Furthermore, protrusions 23 are provided on the outer surface of the cylindrical portion 20 made of a metal material, so that when the molded portion 22 is molded, each protrusion 23 appears on the outer circumferential surface of the rotating ring 2. It is plated with chromium, nickel chromium, etc.

A recess 24 is provided on the outer surface of the molded ff1s22 to improve grip.

[Effect of the Invention 1 As described above, in the present invention, the tool is attached and detached by the relative rotation of the rotary ring with respect to the handle, and the tool is attached and detached without using the chuck handle (in other words, the tool can be attached and detached using only the fingers). In addition, if stronger tightening or removal is difficult due to the presence of the second tightening agitator provided on at least one of the rotating ring or the handle, the second tightening operation section can be used. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is a cutaway front view of the embodiment of the present invention, Fig. 2 is a perspective view of the same, Fig. 3 is an exploded perspective view of the same, Fig. 4 is a perspective view showing the above in use, and Fig. 5 is a perspective view of the same. FIG. 2 is a perspective view of another embodiment, in which 1 is a shaft, 2 is a rotating ring, 3 is a handle;
4 is a tool, 5 is a claw, and 6 is 7T3- as a claw support means.
) Screws 26 and 27 are the tightening and stirring parts of tIIJ2, respectively, and the cut surfaces and holes are shown.

Claims (3)

[Claims] (1) A shaft connected to a drive wheel, a handle fixed to the shaft, a rotating ring rotatable relative to the handle, and a pawl support means that moves in the axial direction by rotating the rotating ring relative to the handle. , a fastening tool comprising a tightening pawl connected to the pawl support means so as to be movable in a radial direction, the rotating ring having a tapered surface that makes sliding contact with the outside surface of the pawl on the inner surface of the rotating ring; Alternatively, a tightening device characterized in that a second tightening operation section is provided on at least one of the handles. (2) The tightening tool according to claim 1, wherein the second tightening operation portion is a cut surface for use with a spanner. (3) The tightening device according to claim 1, wherein the second tightening operation portion is a hole.