| 摘要 |
1,096,557. Clocks and watches. BRAC Ltd. Nov. 28, 1966 [Nov. 29, 1965; Nov. 11, 1966], No. 53109/66. Heading G3T. [Also in Division F2] Angular oscillation of a shaft 33 is converted into unidirectional stepped rotation of a shaft 41, the shaft axes being coplanar and mutually perpendicular, arms 37, 38 extending transversely from the shaft 33 acting alternately on projections 43a-c on the shaft 41 to advance the latter stepwise. In a clock drive, the shaft 33 carries a balance wheel 35 and is acted upon by a spiral spring 39 the outer end of which is anchored at 40. In the rest position of the shaft 33, the bisector of the angle defined by the arms 37, 38 lies in the common plane of the shaft axes. Spring blades 44 act on projections 43d-f aligned with the projections 43a-c to hold the shaft 41 between steps. A single tooth 53 on the shaft 41 drives a sixty tooth gear (52) Fig. 6 (not shown). The oscillation of the shaft 33 is maintained by the action of an electromagnet 47 on a permanent magnet 45 on the balance wheel 35. The electromagnet 47 is energized by a battery 50 via the spring 44, the projections 43a-f, the arms 37, 38, the spring 39, and lines 48, 49 to give two impulses per complete oscillation of the shaft 33. Three oscillations of the shaft 33 give one complete revolution of the shaft 41. In a modification Fig. 8 (not shown) the electromagnet (62) is on the balance wheel and the permanent magnet (63) is fixed, and one arm (67) of the shaft (33) is insulated to give only one impulse per complete oscillation. In Figs.1-3 (not shown) the output shaft (11) carries a six-sided prism (12) against which acts a retaining spring blade (17), three radial bosses (13, 14, 15) on alternate faces of the prism being acted upon by the arms of the oscillating shaft (18). A worm (22) on the output shaft (11) meshes a worm-wheel (23). |
