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热词
    • 10. 发明专利
    • GENEVA MECHANISM
    • GB1254890A
    • 1971-11-24
    • GB3772569
    • 1969-07-28
    • SMITH FLOYD EDWARD
    • SMITH FLOYD EDWARD
    • F16H27/06
    • 1,254,890. Toothed gearing. F. E. SMITH. 28 July, 1969, No. 37725/69. Heading F2Q. In a Geneva mechanism comprising a driver 25 provided with a driving pin 28 and an arcuate locking segment 30, having end faces 32 on opposite sides of the axis of rotation, and a Geneva wheel 40 having slots 41, adapted to receive pin 28, and extending radially from the centre of the wheel, lock arcs 42 are disposed between adjacent slots 41 and arcuate relief portions 45 are provided at the middle region of each lock arc 42, the angular extent of each relief portion being sufficient to clear the end faces 32. In the mid-dwell position of the driving pin 28, the axis of rotation of the driver 25 is moved radially outwardly by means of a lock cylinder 23 in order to eliminate clearance between the driver arcuate faces 32 and the lock arcs 42 of the wheel 40.