Self-gradually locking chuck
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United States of America Patent
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-
Aug 7, 1990
Issued Date -
N/A
app pub date -
Feb 10, 1989
filing date -
Sep 30, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention is a self-gradually locking chuck for drills and similar devices. It is particularly suitable for portable drills in surgical use. The chuck has a cylindrical sleeve that can be fixed axially to the shaft of a drill and predominantly tapering ferrule with lobes. The ferrule can be axially engaged with the sleeve. Means for centering a tool and at least one spring are located within a hollow space in the sleeve. The chuck also has a mounting with a passage and holes for housing jaws. The mounting and the ferrule are axially movable with respect to each other and the sleeve. Jaws, located in the holes and urged toward the axis of the chuck by the lobes, hold a tool that has been inserted between the jaws. The chuck further has an annular ring which can be screwed onto an externally threaded portion of the mounting projecting from the ferrule. The annular ring serves to engage the tool in a locked condition to prevent accidental release of the tool by the chuck.
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