JPH01289608A - Tool chuck - Google Patents

Abstract

PURPOSE:To prevent loosening of a hand operated turning nut without using a handle due to vibration during using a tool and prevent reduction of a tool tightening and holding force by providing a loosening stopping mechanism allowing a jaw to expand, contract, incline, slide by a screw action. CONSTITUTION:When a hand-holding ring 14 is held by hand to turn a control cylinder 7 and turn a turning nut 3 through a connection projected part 8, a connection recessed part 9, a jaw is contracted, advanced, inclined, and slided by a screw action, and when the turning nut is turned in reverse, the jaw can be expanded, retracted, inclined, and slided to push out and remove a tool C. When a locking cylinder 17 of a loosening stopping mechanism 16 is pressed on the hand-holding ring 14, an elastic claw 22 deflects inward, an engaging groove 23 engages a ring projection part 25 to fix the control cylinder 7 in place, and an engaging part 24 engages a locking part 26 so as not to allow the control cylinder 7 to turn. Loose turning of the turning nut 3 due to vibration can thus be prevented. When the locking cylinder 17 is drawn forward, the engagement of the engaging part 24 and the locking part 26 is released to allow the control cylinder 7 to turn.

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. 02, Japanese Utility Model Application Publication No. 60-36105, etc. are known.

FIG. 8 shows a conventional structure, in which a plurality of jaws 2 (three in this case) are provided radially on the chuck body l, and the jaws 2 are capable of expanding and contracting inclination-sliding by screwing into each other by rotation of a rotary nut 3. It is composed of

Incidentally, in the conventional structure described above, the rotation of the rotating nut 3 is achieved by a handle a having a bevel gear structure that is detachable from the chuck body 1. There is a need for a device in which the turning nut 3 can be turned directly by hand.

[Problem to be solved by the invention]

However, in the case of the above-mentioned conventional structure, although it is possible to obtain the desired tightening and holding force by rotating the rotary nut 3 by hand without using the handle a, the vibration during use causes the rotary nut 3 to tighten. This causes the inconvenience that the tightening force of a tool such as a drill decreases and there is a danger that the drill may come off.

[Means to solve the problem]

The purpose of the present invention is to solve these inconveniences, and the gist thereof is to provide a plurality of jaws on the chuck body, and to expand and contract the inclined slides by screwing the jaws together by rotating a rotary nut. The tool chuck is characterized in that the tool chuck is configured to be movable, and is constructed by providing a shank mechanism capable of preventing the rotary nut from loosening.

[Effect]

The hard earth mechanism prevents the rotating nut from loosening and rotating due to vibration, etc.

〔Example〕

1 to 7 show embodiments of the present invention.

Incidentally, the same reference numerals are attached to the same parts as those of the conventional structure shown in FIG. 8 for explanation.

Reference numeral 1 denotes a chuck body, and the chuck body 1 is provided with three jigs a-2 radially so as to be slidable in an inclined manner for expansion and contraction, and the chuck body 1 is divided into parts for assembly after fabrication, similar to the conventional structure. A shape-retaining ring 4 for retaining the shape of the rotary nut 3 is press-fitted onto the outer peripheral surface of the rotary nut 3, and a female thread 5 of the rotary nut 3 is inserted into the jaw 2. It is screwed into the male screw 6 on the outer periphery, and two coupling protrusions 8 are formed protrudingly on the inner surface 7a of the resin-made operating cylinder 7, and can be fitted into the coupling protrusions 8 on the front surface of the rotary nut 3. A coupling recess 9 is formed, a contact ring 11 is provided on the front side of the flange portion 10, and the rotating nut 3 and the contact ring 11 are connected to each other.
A bearing body [ is interposed between them, an operation n7 is fitted to the outer peripheral surface of the shape-retaining ring 4, and a retaining ring 13 is fitted to the inner peripheral surface of the operation cylinder 7.
is attached.

Reference numeral 14 denotes a grip ring, which is fixed to the chuck body 1 so as not to rotate, and has a recess formed on its outer circumferential surface.

Reference numeral 6 is a rear stop mechanism, in which a pressure relief cylinder 17 is loosely fitted to the inner circumferential surface of the grip ring 14, an operating portion is provided at the front of the pressure relief cylinder 17, and the pressure relief cylinder 17 is Key-shaped anti-rotation protrusions 19 are formed at three locations on the inner peripheral surface of the front portion, and the non-rotation protrusions 19 are slidably fitted into the recesses on the outer circumferential surface of the operating cylinder 7 that also serve as a non-slip, thereby reducing pressure. An elastic pawl 22 is formed by a notched groove 21 at the rear ball portion of the cylinder I7, an engagement groove is formed on the outer surface of the elastic pawl 22, and a serration-like locking portion 24 is formed on the rear outer peripheral surface of the pressure-reducing cylinder 17. An annular convex portion 5 is formed in the middle of the inner circumferential surface of the gripping ring 14, and a serration-like serration is formed on the inner circumferential surface of the gripping ring 14 so that it can be slidably engaged with the locking portion. It forms a hard clay seal.

Since this embodiment has the above-mentioned configuration, when the operating cylinder 7 is rotated by gripping the grip ring 14, the rotating nut 3 moves together, and the jaw is tightened by the screwing action between the rotating nut 3 and the bolt 1-2. 2 slides forward and backward in a contracting manner, and the tool C can be clamped by the jaw 2. Also, when the rotating nut 3 is rotated in the reverse direction, the jaw 2 is tightened by the screwing action between the rotating nut 3 and the gear a-2. Sliding, expanding, receding, and tilting
The tool C can be removed, and therefore the rotation nut 3 can be tightened.
The grip ring can be gripped without gripping the chuck body 1 during loosening and rotation, and the rotation nut 3 can be securely tightened and loosened.

To tighten the rotary nut 3, after tightening the tool C by rotation, push the pressure relief cylinder 17 of the rear stop mechanism 16 toward the grip ring 14 as shown in FIGS. n is bent inward and the engagement groove fits into the annular convex portion 5, the operation tube 7 is fixed in position, and the locking portion U and the loosening portion engage, and the pressure relief tube F is Since the operating barrel 7 is in a non-rotating state, the operating barrel 7 cannot be rotated, thereby preventing the rotating nut 3 from loosening and rotating due to vibrations applied when the chuck is used.

Further, when the pressure relief tube 17 of the rear stop mechanism 16 is pulled forward as shown in FIG. 5, the engagement between the locking portion 24 and the loosening portion is released, and the operation tube 7 can be rotated.

Note that the rear stop mechanism 16 may be designed with appropriate changes.

〔Effect of the invention〕

As described above, in the present invention, the rear stop mechanism can prevent the rotation nut from loosening, and the tightening of the rotation nut can prevent the tool tightening holding force from decreasing after rotation.

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

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, in which Fig. 1 is an overall vertical sectional view, Fig. 2 is a lateral view thereof, and Fig. 3 is an A-A view of only the pressure relief cylinder. A-line cross-sectional view, Figure 4 is a cross-sectional view of only the operating barrel, Figure 5 is an enlarged sectional view, Figure 6 is a partial plan view, Figure 7 is an enlarged sectional view, and Figure 8 is the conventional one. FIG. 3 is a longitudinal cross-sectional view of the structure. l...Chuck body, 2...jaw, 3...rotating nut, 16...rear stop mechanism. Pug force f/yA 77ω 6aj

Claims (1)

[Claims] A tool chuck in which a chuck body is provided with a plurality of jaws, and the jaws are capable of expanding and contracting and sliding in an inclined manner by mutual screwing action by rotation of a rotary nut, and a locking mechanism capable of preventing the rotary nut from loosening. A tool chuck characterized in that it is configured by providing.