| 摘要 |
1,152,946. Ratchet mechanisms. PORTESCAP, LE PORTE-ECHAPPEMENT UNIVERSEL S.A. 6 Sept., 1966 [14 Oct., 1965], No. 39890/66. Heading F2Q. A miniature ratchet mechanism comprises a driving pawl 2 formed of a blade bent to an L-shape and pivoted at its elbow in V-notches 6 in spaced-apart walls of an oscillating member 3 driven, e.g., by a tuning fork or a torsional vibrator, one limb 2b of the blade being attracted by a permanent magnet 4 in the member 3 to urge the other limb 2a into engagement with a ratchet wheel 1. Transverse lugs (5) (Fig. 2, not shown) have knife edges (5a) which engage the V-notches 6, and a rod 7 between the walls of the member 3 prevents dislodgement of the blade during handling of the mechanism. A pawl 8 secured to a fixed structure, prevents backrunning of the wheel 1 and may have the same construction and manner of support as the driving pawl.
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