JPH0364246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chuck for a tool such as a drill.

[Conventional technology]

Conventionally, the chuck for this type of tool was
Publication No. 8897, Japanese Utility Model Publication No. 39-32120, etc. are known.

Figure 4 shows the conventional structure, which is
Three jaws 52 are provided on the chuck body 51 in a radial manner so as to be able to expand and contract incline.
Rotating nut 53 divided for assembly after manufacturing
A shape retaining ring 54 for retaining the shape of the rotary nut 53 is fixed to the rotary nut 53 with a screw 55, and a female screw 56 of the rotary nut 53 is connected to a male screw 57 on the outer periphery of the jaw 52. The female thread 60 of the tightening nut 59 is screwed onto the male thread 58 of the chuck body 51.
A retaining ring 61 of the tightening nut 59 is screwed onto the chuck body 51, and a bearing body 62 is provided between the shape retaining ring 54 and the tightening nut 59.

By the screwing action between the rotating nut 53, which grips the tip of the chuck body 51 and rotates the shape retaining ring 54 forward and backward, and the jaw 52, the jaw 52 expands and contracts and slides in an inclined manner, causing the jaw 52 to move forward. When the jaw 52 slides and grips the tool C, the tip of the chuck body 51 is also gripped and the tightening nut 59 is rotated. The rotating nut 53 is pressed forward due to the presence of R between the rotating nut 53 and the chuck main body 51, and the rotating nut 53 is pressed forward and slides forward.
The tool C is pressed and slid by the jaw 52 to clamp the tool C.

[Problem to be solved by the invention]

However, in the case of the above conventional structure, the pressing force of the tightening nut 59 is applied to the bearing body 62 and the shape retaining ring 54.
Since the shape-retaining ring 54 acts on the rotating nut 53 through the shaft, it must not only maintain the shape of the divided rotating nut 53 but also be made of a strong member that can withstand the pressing force. This has the disadvantage that it is necessary to provide a portion with a length necessary for gripping, which goes against the desire for smaller size and lighter weight.

The present invention proposes a tool chuck that solves this problem.

[Means to solve the problem]

The gist of the present invention will be explained with reference to the accompanying drawings.

A plurality of jaws 2 are provided on the chuck body 1, and the jaws 2 are slid in an inclined manner by the screwing action of each other by the rotation of a rotating nut 3, and the rotating nut 3 is tightened by the rotation of a nut 8. Press and slide by
The shape-retaining ring 4 of the rotating nut 3, which is divided into parts for assembly, is provided protruding from the front side of the rotating nut 3, and is tightened at the rear of the chuck body 1. A nut 8 is screwed on, a bearing body 14 is provided between the bearing surface provided on the inner peripheral surface of the tightening nut 8 and the back surface of the rotating nut 3, and a bearing body 14 is provided at the rear end of the chuck body 1. This relates to a tool chuck characterized in that a retaining ring 12 is provided.

[Effect]

The pressing force of the tightening nut acts directly on the rotating nut through only the bearing body, and when the shape-retaining ring and tightening nut rotate, the gripping ring is gripped.

〔Example〕

1 to 3 show embodiments of the present invention, 1
1 is a chuck body, and the chuck body 1 is provided with three jaws 2 in a radial manner so as to be able to expand and contract incline and slide, and the chuck body 1 is equipped with a rotary nut 3 that is divided into parts for assembly after manufacturing, similar to the conventional structure. is rotatably provided, a shape retaining ring 4 for retaining the shape of the rotary nut 3 is fitted and fixed on the outer peripheral surface of the rotary nut 3 and protrudes from the front side, and a plurality of recesses 5 are provided in the shape retaining ring 4. , the female thread 6 of the rotating nut 3 is screwed into the male thread 7 on the outer periphery of the jaw 2.

Reference numeral 8 denotes a tightening nut, in which a female thread 9 of the tightening nut 8 is screwed into a male thread 10 of the chuck body 1, and a plurality of recesses 11 are also formed on the outer peripheral surface of the tightening nut 8.

Reference numeral 12 denotes a grip ring, which is fixed to the chuck main body 1 so as not to rotate, and has a recess 13 formed in its outer peripheral surface.

Reference numeral 14 denotes a bearing body, in which a hard thrust ring 15 is brought into contact with the bearing support surface of the tightening nut 8, and the spherical bearing body 14 is interposed between the thrust ring 15 and the back surface of the rotating nut 3. .

Reference numeral 16 denotes an insertion hole formed on the outer periphery of the chuck body 1, into which a screwdriver or the like is inserted during tightening or loosening to facilitate rotation of the tightening nut 8.

Since this embodiment has the above configuration, when the shape retaining ring 4 is gripped in the left hand, the grip ring 12 is gripped in the right hand, and the shape retaining ring 4 is rotated in the forward and reverse directions, the rotation nut 3 and the jaw 2 are rotated. Due to the screwing action of , the jyo 2 expands and contracts and slides in an inclined manner, and the jyo 2 slides forward, and the jyo 2 grips the tool C.
If the grip ring 12 becomes unable to rotate in this state, then move your left hand to the tightening nut 8 while gripping the grip ring 12 and rotate the tightening nut 8, and the tightening nut 8 will tighten the bearing body 14. Press the rotating nut 3 forward through the link between the rotating nut 3 and the chuck body 1.
Due to the presence of R, the rotary nut 3 is pressed and slid forward, and the jaw 2 is also pressed and slid, so that the tool C can be strongly clamped by the jaw 2.

Further, the tool C can be removed by rotating the tightening nut 8 in the reverse direction and rotating the rotating nut 3 in the reverse direction.

At this time, the pressing force of the tightening nut 8 acts on the rotating nut 3 without going through the shape-retaining ring 4, so the shape-retaining ring 4 can be used as a mere shape-retaining ring, and since the gripping ring 12 can be gripped, the chuck body There is no need to provide a gripping portion at the tip end, so the overall size and weight can be reduced, making it ideal for high-speed rotation.

〔Effect of the invention〕

Since the present invention has the above-mentioned structure, the pressing force of the tightening nut is directly pressed from the rear side of the rotating nut without using the shape-retaining ring, unlike the conventional type that presses the rear end of the long shape-retaining ring. There is no disadvantage that the shape-retaining ring is distorted due to strong pressing force as in the case of the above, and the shape-retaining ring of the split rotating nut for assembly can be made of plastic, and it is possible to use a simple shape-retaining ring. The tool chuck can be protruded from the front side of the main body, eliminates the need for a gripping part at the tip of the chuck main body, and can be made smaller and lighter as a whole, making it ideal for high-speed rotation.

As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an overall sectional view, FIG. 2 is a partial sectional view, FIG. 3 is an enlarged sectional view, and FIG. 4 is a sectional view of a conventional structure. . C...Tool, 1...Chuck body, 2...Jyo, 3...Rotating nut, 4...Shape retaining ring, 8...Tightening nut, 12...Gripping ring, 14...Bearing body.

Claims (1)

[Claims] 1 A plurality of jaws 2 are provided on the chuck body 1,
The jaw 2 is rotated by the rotary nut 3 to expand and contract in an inclined manner by screwing into each other, and the rotary nut 3 is pressed and slid by the rotation of the tightening nut 8, and the jaw 2 is used to tighten the tool C. The shape-retaining ring 4 of the rotating nut 3 is divided for assembly.
is protruded from the front side of the rotating nut 3, and the chuck body 1
Screw the tightening nut 8 onto the rear part of the
Bearing receiving surface and rotating nut 3 provided on the inner peripheral surface of
A chuck for a tool, characterized in that a bearing body 14 is provided between the chuck body 1 and a rear surface thereof, and a grip ring 12 is provided at the rear end of the chuck body 1.