Electricity: motive power systems – Automatic and/or with time-delay means – Pressure in a fluid or granular material
Patent
1973-11-09
1976-01-06
Dobeck, B.
Electricity: motive power systems
Automatic and/or with time-delay means
Pressure in a fluid or granular material
318452, 318473, 307118, 62158, H02H 508
Patent
active
039315606
ABSTRACT:
A control system for a motor having a required oil pressure for the safe operation thereof, the system having a time delay switch for interconnecting an electrical source to the motor to operate the same each time the time delay switch is initially activated by being placed across the power source. The time delay switch has a time delay bimetal means that is adapted to move and open the switch if the oil pressure of the motor does not reach the required value within a predetermined time period from the initial activation of the time delay switch. An oil pressure responsive switch is operatively interconnected to the time delay bimetal means and to the motor to terminate the switch opening movement of the time delay bimetal means if the oil pressure reaches the predetermined value thereof during the predetermined time period so that the motor will be continuously operated as long as the system is not manually or automatically turned off or the oil pressure does not fall below the predetermined value thereof.
REFERENCES:
patent: 2461076 (1949-02-01), Neeson
patent: 2749495 (1956-06-01), Walley
patent: 2981195 (1961-04-01), Payne
patent: 3050003 (1962-08-01), Edwards
patent: 3237848 (1966-03-01), Pihl et al.
patent: 3290576 (1966-12-01), Jensen et al.
patent: 3321669 (1967-05-01), Rhodes
Dobeck B.
Robertshaw Controls Company
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