Patent ID: 6164426
Filing Date: 2000-12-26
Classification: F16D

Abstract:
Wrap around spring clutch between a driving shaft and a driven shaft, comprising a driving shaft and a driven shaft with a wrap around spring which forms a clutch spring which rests by a first section at a friction contact on the driving shaft while a second section envelopes coaxially the driven shaft, and with a control magnet, which upon being excited causes the wrap around spring to enter into a friction contact with the driven shaft and at non-excitation releases the friction contact with the driven shaft, wherein said driven shaft is additionally enveloped by a braking spring which in case of a non-excited control magnet blocks the driven shaft in a direction of drive of the driven shaft, which blocking is released when the control magnet is excited, said braking spring enveloping the driven shaft with a first section and rests with a second section blocked against rotation on a stationary flange which envelopes the driven shaft, and means for rotating the first section of the braking spring in a direction opposite of action of the braking spring and thus opens the braking spring over the driven shaft when the control magnet is excited, said means for rotating comprising a rotatable sleeve in which said first section of the braking spring is anchored, and said sleeve comprising projecting segments which engage an anchor body on a front side of the control magnet and cooperates with the anchor body such that upon excitation of the control magnet the sleeve is rotated by a predetermined opening angle in order to disengage the braking spring from the driven shaft, whereby upon a discontinuation of excitation of the magnet, the braking spring returns on its own to a state of blocking the driven shaft.