B - Operations – Transporting – 25 – B
Patent
B - Operations, Transporting
25
B
310/14, 74/209
B25B 21/00 (2006.01) B25B 21/02 (2006.01) B25F 5/00 (2006.01)
Patent
CA 1201743
ABSTRACT OF THE DISCLOSURE There is described an electric rotary power tool apparatus adapted for loosening jammed or seized automobile wheel nuts or bolts and holdable by hand during operation. The versatility of the known hand-held apparatus is not very great being essentially limited to normal and emergency work on automobiles. The apparatus comprises (1) an electric motor laid out to be driven by an electric direct current having an operational voltage of at least 8 to 30 volts and at least 20 up to 60 amperes, and comprising a stator, a rotor, first and second pole means, and a driving shaft bearing said rotor and having a rotary axis, the speed of said motor, at a nominal voltage of 12 to 24 volts ranging from 8000 to 30000 r.p.m. under load; a casing in which the motor is housed; an on-off and reversing switch; tool socket means being adapted for receiving a socket tool therein and comprising a driven shaft, the speed under load of which driven shaft is in the range of from 1200 to 4000 r.p.m.; a speed-reducing unit comprising a gear trans- mission positively and drivingly connecting the said driving shaft with the driven shaft and adapted for directly and uninter- ruptedly transmitting torque from the driving motor shaft to the driven shaft and reducing the speed of the former to the latter shaft in a ratio of from about 7:1 to about 12:1; impact- producing means comprising an impact mass separate from said motor and being associated with the tool socket means, for imparting impacts to the latter means. The apparatus can also be used as a hobby tool by eliminating the impact-generating unit.
438112
Fetherstonhaugh & Co.
Van Laere Christiaan G.m.
LandOfFree
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