Portable machine tool with automatic locking of the work spindle

Details Portable machine tool with automatic locking of the work spindle Portable machine tool with automatic locking of the work spindle

1988-11-23

1991-02-05

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51170R, 83666, B24B 4104, B24B 4500, B24B 2302, B26D 112

Patent

active

049893742

ABSTRACT:
In order to so improve a portable machine tool, in particular, an angle grinder, with a drive, with a work spindle having a tool clamping means and with a securing device which is operable from outside an apparatus housing and by means of which the tool clamping means is transferable from a manually releasable position to a manually unreleasable position in which the tool is clamped--and vice versa--that with a design which is as simple as possible from a structural point of view, rotation of the work spindle is not possible while the tool clamping means is being released or manually tightened, it is proposed that a locking device for non-rotatably fixing the work spindle on the apparatus housing be provided and that the locking device automatically lock the work spindle in a non-rotatable manner when the drive is switched off and the securing device is i the position in which the tool clamping means is manually releasable--and vice versa.

REFERENCES:
patent: 3945694 (1976-03-01), Vaillette
patent: 4434586 (1984-03-01), Muller
patent: 4597227 (1986-07-01), Gentischer
patent: 4901479 (1990-02-01), Helm

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