Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Reexamination Certificate
2000-04-20
2001-10-16
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
C279S140000, C279S902000
Reexamination Certificate
active
06302407
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a chuck structure adapted for use with an electrically or pneumatically operated drill having a power shaft, more particularly to a chuck structure adapted to be hand-tightened and having locking and positioning functions.
(b) Description of the Prior Art
A conventional drill bit clamping structure mainly includes a rotary shaft connected provided with a chuck body. The body is externally provided with a rotatable adjustment shell and a fixed shell. The body is internally and annularly provided with a plurality of slanting clamp pawls. The user may rotate the adjustment shell to match the turning of the threads to control the clamp pawls to obliquely advance or withdraw to thereby achieve the object of bit clamping or release.
However, in the above-mentioned structure, after locking, the adjustment shell is in a non-positioning state, which may lead to loosening of the clamp pawl and hence falling of the bit, so that the user may have to stop operation and re-lock the bit. This is not only inconvenient to the user, it may also cause danger to the user.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a chuck structure having locking and positioning functions to eliminate the drawbacks associated with the prior art. According to this object of the present invention, an upper shell body is manually rotated to bring a drive seat to rotate therewith. The drive seat hence causes clamp pawls to obliquely advance or withdraw to achieve bit clamping or release. A limiting ring is provided with generate an engagement or disengagement effect with the upper shell body. It is only necessary to cause the upper shell body to displace downwardly after tightening of a bit in order to bring the upper shell body to engage with the limiting ring. By means of a groove of the upper shell body that engages a retaining ring of a lower shell body, the chuck as a whole can be locked to prevent slippage of the bit due to vibration or excessive torque and to maintain the clamping force of the clamp pawls.
Another object of the present invention is to provide a chuck structure with locking and positioning functions in which a body has a top end provided with a bearing assembly. The bearing assembly includes a bearing seat formed from a rubber material and internally provided with an elastic plate having a radial opening, which can elastically hold a bit to obviate holding of the bit by hand and to prevent slippage of the bit when the chuck is released.
REFERENCES:
patent: 5183274 (1993-02-01), Sakamaki
patent: 5435578 (1995-07-01), Rohm
patent: 5499829 (1996-03-01), Rohm
patent: 5816582 (1998-10-01), Steadings et al.
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