Hand held drilling tool for removing spot welds

Details Hand held drilling tool for removing spot welds Hand held drilling tool for removing spot welds

1987-10-05

1989-05-16

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

408 87, 408102, 408112, 408137, 408241S, B23B 4100

Patent

active

048305502

ABSTRACT:
A drilling tool for removing spot welds includes a central shaft having a threaded portion which extends through a center nut and washer assembly. A pair of oppositely opposed compression springs bear on the center nut and washer assembly to maintain it in a fixed position. Stops located on the shaft engage the center nut and washer assembly to limit the forward travel of the drill bit. This ensures that the drill bit has a predetermined stroke length. The springs provide compression for the drill bit as the shaft rotates thus forcing the drill bit into the workpiece, but with some resilience so that the drill does not bind up.

REFERENCES:
patent: 3526158 (1970-09-01), Adams et al.
patent: 4012161 (1977-03-01), Shultz
patent: 4735528 (1988-04-01), Parrone

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