Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Patent
1989-05-17
1990-08-28
Howell, Daniel W.
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
279 1K, 279 60, B23B 3110
Patent
active
049519557
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to a chuck for a tool such as a drill.
2. Description of the Related Art:
FIGS. 10 and 11 show a conventional chuck for a tool of the above-described type. This chuck includes a chuck body 1, three jaws 2 mounted on the chuck body 1, a rotating member 3 and a rotating nut 4 threadingly engaged with the jaws 2. The jaws 2 are caused to slide in a slanted attitude and thereby contract and expand due to the threaded engagement of the jaws 2 with the rotating nut 4 by rotating the rotating member 3.
In this conventional chuck, the jaws 2 contract and a tool W is thereby fastened when an operator grips and rotates the rotating member 3. Further, the jaws 2 are also caused to contract so as to fasten the tool W by rotating the chuck body 1. Rotation of the chuck body 1 is achieved by fixing a spindle 7 such as an electric drill to a mounting portion 5 of the chuck body 1 and by rotating the spindle 7 while the rotating member 3 is being held stationary by an operator.
However, in the conventional chuck, the fastening force of the tool W is obtained by the interaction of the gripped force of the rotating member 3 and the rotating force of the chuck body 1, and this causes the tool to be fastened with an insufficient amount of force.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a chuck for a tool which is capable of obviating the abovedescribed problem of the prior art.
To this end, the present invention provides a chuck for a tool in which a plurality of jaws mounted on a chuck body are caused to slide in a slanted attitute and thereby contract and expand by virtue of the threaded engagement of the jaws with a rotating nut by rotating a rotating member. The chuck for the tool is characterized by the inclusion of a clutch mechanism which is provided between the rotating member and the rotating nut.
With the above-described arrangement, when the chuck body is rotated with the rotating member being held stationary so that the rotating nut does not rotate, the jaws are caused to slide in a slanted attitude and contract by virtue of the threaded engagement of the jaws with the rotating nut and the tool is thereby fastened by the jaws. When the chuck body is further rotated in this state, the transmission of power from the rotating nut to the rotating member is intermittently cut off by the clutch mechanism.
In the present invention, the transmission of power is intermittently cut off by the clutch mechanism, generating an impact force. This impact force increases the amount of force with which the tool is fastened, and makes release of the tool smooth.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a chuck, showing a first embodiment of the present invention;
FIG. 2 is a section taken along the line A--A of FIG. 1, showing an annular body of a clutch mechanism;
FIG. 3 is a section taken along the line B--B of FIG. 1, showing a rotating nut of the clutch mechanism;
FIG. 4 is an enlarged cross-sectional view of the essential parts of the clutch mechanism;
FIG. 5 is an enlarged cross-sectional view of an upper half of the chuck, showing the operation thereof;
FIG. 6 is a cross-sectional view of a chuck, showing a second embodiment of the present invention;
FIG. 7 is a section taken along the line A--A of FIG. 6;
FIG. 8 is a cross-sectional view of a chuck, showing a third embodiment of the present invention;
FIG. 9 is a cross-sectional view of a chuck, showing a fourth embodiment of the present invention;
FIG. 10 is a cross-sectional view of a conventional chuck; and
FIG. 11 is a front view of the chuck of FIG. 10, with parts broken away for clarity.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will now be described by way of example with reference to FIGS. 1 to 9.
In the embodiments described later, it is to be noted that the same reference numerals are used to denote parts which are the same as those in the conventional example shown in FIG. 10.
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REFERENCES:
patent: 2684856 (1954-07-01), Stoner
patent: 4277074 (1981-07-01), Kilberis
patent: 4526497 (1985-07-01), Hatfield
patent: 4669932 (1987-06-01), Hartley
patent: 4682918 (1987-07-01), Palm
patent: 4695065 (1987-09-01), Komatsu et al.
patent: 4840387 (1989-06-01), McCarthy
Howell Daniel W.
Sakamaki Mfg. Co., Ltd.
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