Quick-change hole saw mandrel

Details Quick-change hole saw mandrel Quick-change hole saw mandrel

1980-05-19

1981-12-01

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

279 1A, 279 89, 408226, B23B 4102, B23B 3144, B23B 522

Patent

active

043033571

ABSTRACT:
The present quick-change mandrel for attaching a hole saw to an electric drill has different sized oblong locking segments at its front end which match the usual oblong openings in the back of different sized hole saws. The hole saw is slid rearward over the corresponding locking segment and then is turned in peripheral grooves in that locking segment to engage behind rearwardly-facing shoulders on the locking segment. The reaction force on the hole saw when it is cutting into a workpiece forces it more tightly in the grooves.

REFERENCES:
patent: 1424743 (1922-08-01), Smith
patent: 1841635 (1932-01-01), Salmon
patent: 3647310 (1972-03-01), Morse
patent: 3784316 (1974-01-01), Bittern
patent: 3880546 (1975-04-01), Segal

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