Boots – shoes – and leggings
Patent
1997-09-15
1999-06-22
Grant, William
Boots, shoes, and leggings
3644741, 408 1R, 408 6, 408 9, 706900, G06F 1900, B23B 4724
Patent
active
059148829
ABSTRACT:
A device for and method of preventing accidents caused by jamming of a tool when working with hand-operated machine tools driving a rotating tool, especially hammer drills, is outfitted with an interrupter device for interrupting the action of the driving motor on the rotating tool depending on the operating state detected by a deflection sensor (1). The device includes a computer unit (R) in which a probability for an expected accident is determined from the sensor signals supplied by the deflection sensor (1), and in that the interrupter device (5, 6) can be activated when a preset accident probability is exceeded. In the method rotational movement values are determined from the measurement signals supplied by the deflection sensor (1), these rotational movement values are converted in a computer unit (R) by nonlinear logic operations to form accident probabilities and activating the interrupter device as soon as the estimated accident probability exceeds a preadjustable threshold value.
REFERENCES:
patent: 4820962 (1989-04-01), Millauer
patent: 4839823 (1989-06-01), Matsumoto
patent: 5584619 (1996-12-01), Guzzella
Garland Steven R.
Grant William
Hilti Aktiengesellschaft
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