JPS63207504A - Chuck for tool - Google Patents

Abstract

PURPOSE:To miniaturize and make light in weight a chuck by making plural jaws to be expandingly, contractingly, and tiltingly slided with a mutual threaded engaging action by a rotation of a rotation nut, pressedly sliding the nut by a rotation of a locknut, and enabling a tool to be pressingly tightened by said jaws, also, providing a gripping ring to the chuck main body. CONSTITUTION:When a rotation nut 3 is positively or reversely rotated with a gripping ring 12 gripped, a jaw 2 is expandingly, contractingly, and tiltingly slided by a threaded engaging action of the nut 3 and the jaw 2. And a tool C is nipped by the jaw 2, a locknut 8 is rotated with the gripping ring 12 gripped, and the nut 3 is pressed forward via a bearing body 14. At that time, the nut 3 is pressingly slided forward by the existence of the gap R between the nut 3 and a chuck main body 1, and the tool C is pressingly tightened with the jaw 2 also pressingly slided. And the tool C is removed by making the nut 3 to be reversely rotated with the nut 8 reversely rotated. Therefore, a gripping part is not required to be provided on the tip part of the chuck main body 1 as the gripping ring 12 can be gripped, and thereby the whole chuck can be miniaturized and made light in weight.

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, as a chuck for this type of tool, there was a
Publication No. 7, Japanese Utility Model Publication No. 39-32120, etc. are known.

FIG. 4 shows a conventional structure, in which three jaws 52 are provided on the chuck body 51 in a radial manner and can be slid in an inclined manner for expansion and contraction. A nut 53 is rotatably provided, and a shape retaining ring 54 for retaining the shape of the rotary nut 53 is attached to the rotary nut 53 by a screw 5.
5, and tighten the female thread of the rotating nut 53 with the jaw 5.
2, and the chuck body 5
Screw the female screw (■) of the tightening nut 59 onto the male thread of No. 1, screw the retaining ring 61 of the tightening nut 59 onto the chuck body 51, and place a bearing between the shape-retaining ring bait and the tightening nut 59. It is configured by providing a body 62.

When the tip of the chuck main body 51 is gripped and the shape retaining ring M is rotated forward and backward, the jaw 52 expands and contracts by the screwing action between the rotation nut 53 and the jaw 2=52, and the jaw 52 is slid forward, and with the jaws 52 holding the tool C, gripping the tip of the chuck body 51 and rotating the tightening nut 59 causes the tightening nut 59 to hold the bearing body axis and retain its shape. The rotating nut 53 is pressed forward through the ring M, and as the gap R between the rotating nut 53 and the chuck body 51 exists, the rotating nut 53 is pressed and slid forward, and the jaw 52 is also pressed and slid. The tool C is clamped by the jaws 52.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned conventional structure, it is necessary to provide a portion at the tip of the chuck body 51 with a length necessary for gripping, which is disadvantageous in that it goes against the demand for reduction in size and weight.

[Means for solving problems]

The purpose of the present invention is to eliminate these inconveniences.The gist of the present invention is to provide a plurality of jaws on the chuck body, and expand and contract the jaws by screwing them together by rotating a rotary nut. The chuck slides at an angle, and is provided so that the rotating nut can be pressed and slid by the rotation of the tightening nut, and the tool can be clamped by the jaw, and the chuck body is provided with a grip ring. The tool chuck is characterized by:

[Effect]

When rotating the rotating nut and tightening nut, grasp the grip ring.

〔Example〕

1 to 3 show an embodiment of the present invention, in which 1 is a chuck body, and the chuck body 1 is provided with three jaws 2 in a radial manner so as to be slidable in an inclined manner. Similar to the conventional structure described above, a divided rotary ring 3 is rotatably provided for assembly after manufacture, and a shape retaining ring 4 for retaining the shape of the rotary nut 3 is fitted onto the outer peripheral surface of the rotary nut 3. A plurality of recesses 5 are provided in the shape retaining ring 4, and 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 onto 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 screw 8.

The grip ring is fixed to the chuck body 1 so as not to rotate, and has a recess 13 formed on its outer circumferential surface.

Numeral 14 is a bearing body, and a hard thrust ring 15 is brought into contact with the tightening nut 8, and the spherical bearing body 14 is interposed between the thrust ring 15 and the rotating nut 3.

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

Since this embodiment has the above-mentioned configuration, when the rotating nut 3 is rotated in the forward and reverse directions by gripping the grip ring n, the jaw 2 expands and contracts by sliding in an inclined manner due to the screwing action between the rotating nut 3 and the jaw 2. 2 is slid forward, and when the jaw 2 grips the grip ring and rotates the tightening nut 8 while holding the tool C, the tightening nut 8 engages the rotating nut 3 via the bearing body 14. press forward,
Due to the existence of the gap R between the rotating nut 3 and the chuck body 1, the rotating nut 3 is pressed and slid forward, and the jaw 2 is also pressed and slid, so that the tool C can be 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 made into a simple shape-retaining ring, and the gripping ring can be gripped. As a result, there is no need to provide a gripping portion at the tip of the chuck body 1, which allows the overall size and weight to be reduced, making it ideal for high-speed rotation.

〔Effect of the invention〕

As described above, since the present invention can be gripped by the gripping ring, there is no need to provide a gripping part at the tip of the chuck body, and therefore the overall size and weight can be reduced, making it ideal for high-speed rotation. becomes.

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

[Brief explanation of the drawing]

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...Jaw, 3...
- Rotating nut, 8... Tightening nut, n... Grip ring. May 28, 1986

Claims (1)

[Claims] A plurality of jaws are provided on the chuck body, and the jaws are slidably expanded and contracted by mutual screwing action by rotation of a rotating nut,
The rotary nut is slidable under pressure by the rotation of the tightening nut, and the jaw is capable of clamping the tool, and the chuck body is provided with a grip ring. chuck for tools.