Back-up safety system for machine having rotatable part declutch

Details Back-up safety system for machine having rotatable part declutch Back-up safety system for machine having rotatable part declutch

1978-01-23

1980-01-01

Wyche, Benjamin

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 0058, 192 0094, 192129A, 56 105, A01D 5300, F16D 6702

Patent

active

041812069

ABSTRACT:
A back-up safety system stops the engine of a machine such as a power mower upon failure of a main safety system whereby release of a dead man control normally declutches a work performing member from the engine and brakes it to a stop while the engine continues to run. The back-up safety system comprises a switch that is closed upon release of the dead man control, in series with an SCR in a magneto grounding circuit. The SCR is gated on by a sensor comprising a biasing coil connected with the SCR, a ferromagnetic rotor constrained to rotate with the work performing member and having circumferentially spaced pole projections, a permanent magnet, and a core with which the coil is coupled and which cooperates with the rotor and magnet to define a magnetic circuit wherein flux density varies as rotor projections pass a pole face on the core.

REFERENCES:
patent: 3736729 (1973-06-01), Peterson
patent: 3955653 (1976-05-01), Comer
patent: 3969875 (1976-07-01), Nofel
patent: 4062135 (1977-12-01), Dobberpuhl

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