Electromagnetic counting mechanism

Details Electromagnetic counting mechanism Electromagnetic counting mechanism

1978-09-25

1980-10-14

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

G06M 110

Patent

active

042283477

ABSTRACT:
An electromagnetic counting mechanism having a rotary counter and an electromagnetic operator with a pivotal clapper adapted to be magnetically actuated for indexing the counter. The clapper has a primary air gap and a tangential projection which cooperates with an edge of a pole of the electromagnet to provide a secondary air gap to reduce the rate of increase of magnetic force as the clapper is pivoted to its closed gap position and so that the magnetic force/clapper displacement curve has a generally flattened slope less than that of the return spring force/clapper displacement curve for stable pivotal operation of the clapper with a shaped drive pulse.

REFERENCES:
patent: 2798670 (1957-07-01), Boyer
patent: 3047224 (1962-07-01), Ray et al.
patent: 3551648 (1970-12-01), Zimmerman et al.

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