| 摘要 |
<p>474,551. Supply meters. WESTING- HOUSE ELECTRIC & MANUFACTURING CO. Nov. 20, 1936, No. 31777. Convention date, Nov. 29, 1935. [Class 37] In a maximum-demand electric supply meter of the type in which the maximum consumption of energy during periodically recurring intervals of time is recorded by a pointer 12, Fig. 1, which is moved on by a driving member 20, periodically react to zero, the driving connection to the member 20 is interrupted to permit such periodical resetting by means of a cam member 72, Fig. 3, driven by a timing mechanism at a predetermined speed and a second member 62 driven by the same mechanism, but at a lower speed, this member 62 carrying a cam surface 68 adapted to be engaged by a cam surface 74 on the member 72, one such engagement being arranged to occur at the instant when the parts 68, 74 are opposite a member 80 which is thereby moved to break the driving connection. The pointer 12 is frictionally held in its displaced position by a spring clip 16 which also acts as a stop and the member 20 for advancing the pointer is fixed to a sleeve 22 which is carried by a shaft 25 and is biassed to its initial position by a spring 28. The sleeve 22 is widened at one end, this end cooperating with a resilient pad secured to a gear 24 and pressed against the sleeve by a spring 36 to form a friction clutch. The gear 24 is secured to a sleeve 34 slidable along the shaft 25 and is moved to release the clutch by a pivoted lever 45 which carries the part 80. The members 62, 72 are in the form of coaxial discs driven through a one-way clutch by a synchronous motor 50 through suitable gearing, the disc 72 rotating twelve times as fast as the disc 62. The cam surface 68 is carried by a lever 64 pivoted to the disc 62 so that when the surfaces 68, 74 engage, a part 66 of the lever is projected beyond the edge of the disc. This is arranged to occur once when opposite the part 80 and then causes the lever 45 to move about its pivot and force the sleeve carrying the gear 24 along shaft 25 out of engagement with the sleeve 22, so that the member 20 is returned to its initial position against the stop 16 by the spring 28.</p> |
