Portable electric tool with variable torque

Details Portable electric tool with variable torque Portable electric tool with variable torque

1987-01-30

1988-07-19

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

192 0034, 192 56R, 310 50, 310 68B, H02K 1100, H01H 302

Patent

active

047587547

ABSTRACT:
In motor-operated machines, especially portable electric tools, it is essential to prevent an impermissibly high torque on the driveshaft or operating spindle. This is attained by means of a torque-disengagement mechanism. An especially elegant, compact, precisely responsive torque-disengagement mechanism is attained by mounting one of the two bearings for a driveshaft in the machine housing or similar structure in such a way that it can move across the longitudinal axis or radially far enough to initiate a switching procedure. The bearing is secured in an initial position by means of an opposing force. The position represents both the zero position for the switching procedure and the correct position of the axis of the driveshaft during operation. If the machine includes a means of varying the torque, the power of the opposing force can be adjusted and maintained either continuously or discontinuously. The opposing force is generated in a practical way by a spring, specifically either by a compact but still powrful stack of cup springs or by a torque rod, both requiring little space.

REFERENCES:
patent: 3162250 (1964-12-01), Sindelar
patent: 4063600 (1977-12-01), Krzes
patent: 4208555 (1980-06-01), Ikeda et al.
"Wie Funktioniert Das?", Bibliographisches Inst., Mannheim, 1963, pp. 612, 613.

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