FREE-WHEEL DRIVE MECHANISM FOR COUPLING A RECIPROCATINGLY PIVOTABLE OPERATING LEVER TO A ROTATABLE OUTPUT MEMBER

摘要

1536734 Ratchet mechanism KEIPER KG 4 May 1976 [12 June 1975] 18254/76 Heading F2Q In a ratchet mechanism, a driven wheel 13 is engaged by a pawl 35 carried by an operating lever 16 which is pivotally mounted on a support arm 15 by means of a pivot pin 17, the support arm 15 being rotatable about the axis of the driven wheel 13 and relative angular movement between the lever 16 and arm 15 being limited by a pin 28 engaging apertures 22, 29 in these members. The pin 28 is carried by a spring-pressed handle portion 24. In the condition shown in Fig. 1, movement of the lever 16 in the anti-clockwise direction causes movement of the wheel 13 anti-clockwise. On the return movement, pin 28 engages a central abutment 20 in the aperture 22. For movement of the wheel 13 in the reverse direction, the handle portion 24 is depressed so that the pin 28 rides over the abutment 20 and operates in the other portion of the aperture 22. In a modification, shown in Figs. 3 and 4, an output friction disc 40 is engaged by a stud 49 or stud 50 carried by an operating lever 48. In a further modification, shown in Figs. 5 and 6, a disc-shaped output member 60 has an embossed annular zone 61 which is adapted to be engaged by two drive studs 65, 66 carried by an operating lever 64.