Fail safe stop for a drill press control device

Details Fail safe stop for a drill press control device Fail safe stop for a drill press control device

1991-11-01

1992-07-07

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With interlock between machine elements

408 14, 408241S, 409218, B23B 4900

Patent

active

051277751

ABSTRACT:
Quality control attachment adapted to be fitted onto a threaded depth control bar of a drill press machine includes a sleeve having an axial opening for fitting onto the control bar and being longitudinally movable relative to the bar. The sleeve carries a pawl and an elastic O-ring which urges an edge portion of the pawl into engagement with the threads of the control bar for enabling one-way movement of the control bar downwardly through the sleeve. An actuator pin is slidably disposed in a bore which extends through the sleeve and is movable downwardly in response to contact with a stop-nut disposed on the bar when the drill press has advanced to a preset depth represented by the position of the stop-nut. The attachment serves to prevent retraction of the drill from a hole unless the control bar, which tracks axial movement of the drill, has moved downward sufficiently for the actuator pin to contact the stop-nut and shift the pawl outwardly of the control bar thereby ensuring that the hole has been drilled to its preset depth.

REFERENCES:
patent: 2909082 (1959-10-01), Booth
patent: 3689172 (1972-09-01), Stites
patent: 3724963 (1973-04-01), Stadtmiller
patent: 3724964 (1973-04-01), Needham, Jr.

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