Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1990-10-01
1991-09-24
Shoop, Jr., William M.
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318662, 198444, 198577, H02P 100
Patent
active
050516710
ABSTRACT:
Sensor circuitry which detects the presence or absence of material and activates a motor responsive thereto, having a capacitor which emits electric signal responsive to the presence of the material, a signal processing unit receives the capacitor's signal and shapes it into a usable signal, wherein the usable signal is received by a timer which is held in reset thereby. When the material's presence is no longer detected, the timer counts a delay during which a control signal is output to a control transistor which responsively actuates a relay which is connected to and forms a link of a power circuit that supplies energy to the motor. A transformer is connected to the power circuit and selected windings of the transformer are connected to the relay. When the transistor is off and relay is inactive, there is a large voltage drop across the transformer thereby deactivating the motor. When the relay is actuated by the transistor, a relatively small voltage drop occurs across the transformer and a sufficient flow of energy passes to the motor and activates the same.
REFERENCES:
patent: 4131834 (1978-12-01), Blaskowski
patent: 4323829 (1982-04-01), Witney et al.
patent: 4541053 (1985-09-01), Knots et al.
patent: 4567410 (1986-01-01), Martin et al.
patent: 4613802 (1986-09-01), Kraus et al.
patent: 4687979 (1987-08-01), Ashton et al.
patent: 4871058 (1989-10-01), Shields
Crider Grant W.
Smith Nathan J.
Hired Hand Manufacturing, Inc.
Shoop Jr. William M.
Wysocki A. Jonathan
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