Power-driven electrical hand tool

Details Power-driven electrical hand tool Power-driven electrical hand tool

1992-11-25

1994-09-27

Smith, Scott A.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

81475, B25B 23157

Patent

active

053500261

ABSTRACT:
In a power-driven electrical hand tool, especially an electric screwdriver, with a coupling that undoes the drive connection between driving electric motor and tool output shaft when the working process is complete, and with an output shaft mounted so as to be displaced axially with a depth stop, it is proposed that the coupling be configured as a friction coupling which produces the drive connection at least predominantly by frictional engagement on the basis of the applied pressure exerted on the output shaft, which friction coupling separates the drive connection again when the applied pressure is reduced or absent, force deflection elements being provided that transmit the pressure effect received from the applied pressure via the output shaft, with concurrent amplification, to the annular coupling surfaces effecting the nonpositive frictional entrainment.

REFERENCES:
patent: 1832123 (1931-11-01), Holland
patent: 2113512 (1938-04-01), Kesterton
patent: 2884103 (1959-04-01), Connell
patent: 3442360 (1969-05-01), Fulop
patent: 3477521 (1969-11-01), Kiester et al.
patent: 3969961 (1976-07-01), Amoroso
patent: 4154308 (1979-05-01), Goldsberry et al.
patent: 4913242 (1990-04-01), Lo
patent: 5060733 (1991-10-01), Kress
patent: 5094133 (1992-03-01), Schreiber

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