Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Reexamination Certificate
1999-12-17
2001-06-19
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
C279S902000
Reexamination Certificate
active
06247705
ABSTRACT:
The present invention relates to a drill chucking device, and particularly, to a manually tightened drill chuck.
Various drill chucks now on the market generally comprise such parts as a body member, jaws, a front sleeve, a nut, a bearing, a bearing gasket, a front sleeve, a rear sleeve, a retainer for the front sleeve or a retaining spring. The body member is connected, with interference, to the bearing gasket, the rear sleeve, and the front sleeve retainer: three jaws are respectively received in three angled bores of the body member; and the nut is disposed in a nut groove of the body member to form a screw transmission with the threads on the jaws. A nut jacket is connected, with interference, to the exterior of the nut to make the split nut become an integral whole and the front sleeve mounted on the nut.
This type of nut is of complicated configuration and the groove on the nut needs to be worked by milling, which will cause an extremely large expense. For example, nut
60
in WO-A-97/06912 is with groove
66
. If a nut is with a groove, a powder metallurgy material, which is easy to be moulded by die casting, bas to be used as the material for the nut. However, this kind of material can not achieve the level that high quality carbon tool steel can, affecting adversely the service life and reliability of the nut. If high—quality carbon tool steel is used, a step of groove milling will be added with high cost.
Therefore, an object of the present invention is to provide a manually tightened drill chuck wherein the nut can be effectively driven by rotating the front sleeve, and this type of drill chuck does not have a nut which requires the step of groove—milling with high cost, but employs a grooved nut jacket which is easily worked.
Another object of the present invention is to provide a manually tightened drill chuck in which the rear sleeve and the rear end of body member are fitted securely with a reliable performance.
To achieve the above objects of the present invention, said nut jacket has a bottom portion towards the front end of the body member, and several key slots are cut out axially in the bottom portion. The keys correspondingly provided on the front sleeve can be inserted into said key slots in the bottom portion of the nut jacket in order that the nut jacket and further the nut can be driven to rotate when the front sleeve rotates, causing the jaws to advance or retract in the angled bores of the body member, thus realizing the opening or closing of the jaws; at the outer wall of the rear end of said body member, there is milled a cylindrical guide part, which is immediately followed by several symmetrically distributed recesses with parallel axes, and the inner wall of the rear sleeve is also provided with a cylindrical guide portion, several symmetrically distributed keys, which project in the direction of the axis of the portion, are inserted into said recesses, thus causing the rear sleeve and the body member to be fixed and unrotatable relative to each other, and avoiding a slippage produced due to a looseness between the body member and the rear sleeve .
Present invention has the advantages of a rational configuration, convenient assembly, stable performance and reliable operation, and is applicable to various chucking devices of manually tightened drills.
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patent: 1984839 (1934-12-01), Murray
patent: 2996302 (1961-08-01), Haviland et al.
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patent: 5145192 (1992-09-01), Rohm
patent: 5193824 (1993-03-01), Salpaka
patent: 5342154 (1994-08-01), Holzer
patent: 5348317 (1994-09-01), Steadings et al.
patent: 5348318 (1994-09-01), Steadings et al.
patent: 5669616 (1997-09-01), Ho
patent: 5692998 (1997-12-01), Weigel
patent: 5944328 (1999-08-01), Lin et al.
patent: 97/06912 (1997-02-01), None
Cai Mingquan
Long Lianhai
Sun Kangiun
Yang Guimo
Yang Shengzhi
Bishop Steven C.
Jenkens & Gilchrist P.C.
Shandong Weida Machine Tool Tools Group Corporation
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