Core body lock device of core drill and core body used for...

Details Core body lock device of core drill and core body used for... Core body lock device of core drill and core body used for...

2005-08-09

2005-08-09

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

C408S23900A

Reexamination Certificate

active

06926476

ABSTRACT:
It is an object to provide a locking device of a core drill which automatically locks a core body when the core body is attached to a base body, the coupling relation between the base body and the core body being fixed unless an unlocking operation is performed by an act of worker, wherein in the core drill including the base body and the core body which are connected to each other by the engagement of an engagement projection with an engagement concave portion, an engagement pawl of the locking device is disposed on the base body, and under the condition that the engagement projection engages the engagement concave portion, the engagement pawl being biased by a compression spring is caused to descend to a back portion of the engagement projection to fix the engagement projection within the engagement concave portion thereby locking the core body.

REFERENCES:
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patent: 2001162424 (2001-06-01), None
patent: 2002120218 (2002-04-01), None

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