US3726607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coin-actuated crankcase pump control circuit
Assignee: Monarch Enterprises Inc
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Filing: 1971-12-27
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Granted: 1973-04-10
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Expires: 1991-12-27
Abstract
Abstract This invention relates to an improved electrical circuit for controlling the operation of a crankcase pump which is characterized by a coin-actuated 110 V. pump motor actuating circuit and an overriding low-voltage pump shut-down circuit that monitors the flow of fluid and responds to the cessation thereof. The circuit also includes a manual starting switch that enables the operator to delay initiation of the pumping cycle so that it will not begin upon insertion of the coin. The pump shutdown circuit has a time-delay feature which prevents premature termination of the pumping cycle initiated by a false response by the fluid-flow sensor. Finally, the circuit provides the operator with a signal that denoted completion of the pumping cycle.
Inventors
- 👤 M Garman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:50
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/06; G; G01; G01N; G01N1/00; G01N1/02; G01N1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
250 words
The control circuit for operating an electrically-driven suction pump of the type used to pump oil out of the crankcase of an automotive vehicle which comprises: an electric pump motor connectable to a soUrce of electrical energy to define a main motor circuit; a first normally-open relay-actuated switch connected in the main motor circuit in series with the motor; a second normally-open relay-actuated switch connected in series with the relay of the first relay-actuated switch and connectable to a source of electrical energy to define a holding circuit; a normally-open fluid-actuated switch responsive to the flow of fluid through the pump connected in series with the relay of the second relay-actuated switch means and connectable to a source of electrical energy to define a sensing circuit; and, a normallyopen manually-actuated switch connected in series with the relay of the first relay-actuated switch means and in parallel with the second relay-actuated switch means to define a starting circuit, said starting circuit being operative upon closure of the manually-actuated switch means to actuate the main motor circuit and start the motor, the sensing circuit being operative upon actuation of the main motor circuit in a manner to cause fluid flow so as to actuate the holding circuit and keep the main motor circuit actuated upon deactivation of the starting circuit, and said sensing circuit being responsive to discontinuance of the fluid flow through the pump to deactivate the holding circuit thereby deactivating the main motor circuit if the starting circuit is deactivated.
Claim 2
Dependent Claim
250 words
The control circuit for operating an electrically-driven suction pump of the type used to pump oil out of the crankcase of an automotive vehicle which comprises: an electric pump motor connectable to a soUrce of electrical energy to define a main motor circuit; a first normally-open relay-actuated switch connected in the main motor circuit in series with the motor; a second normally-open relay-actuated switch connected in series with the relay of the first relay-actuated switch and connectable to a source of electrical energy to define a holding circuit; a normally-open fluid-actuated switch responsive to the flow of fluid through the pump connected in series with the relay of the second relay-actuated switch means and connectable to a source of electrical energy to define a sensing circuit; and, a normallyopen manually-actuated switch connected in series with the relay of the first relay-actuated switch means and in parallel with the second relay-actuated switch means to define a starting circuit, said starting circuit being operative upon closure of the manually-actuated switch means to actuate the main motor circuit and start the motor, the sensing circuit being operative upon actuation of the main motor circuit in a manner to cause fluid flow so as to actuate the holding circuit and keep the main motor circuit actuated upon deactivation of the starting circuit, and said sensing circuit being responsive to discontinuance of the fluid flow through the pump to deactivate the holding circuit thereby deactivating the main motor circuit if the starting circuit is deactivated.
Claim 3
Dependent Claim
61 words
The suction pump control circuit as set forth in claim 1 which includes: signaling means connected in the sensing circuit in series with the fluid-actuated switch means and in parallel with the relay of the second relay-actuated switch means, said signaling means being operative to indicate the flow of fluid through the pump so long as said sensing circuit is activated.
Claim 4
Dependent Claim
57 words
The suction pump control circuit as set forth in claim 1 which includes: normally-open coin-actuated switch means connected into the main motor circuit in series with the first relay-actuated switch means, said switch means being operative in closed position with said first relay-actuated switch means closed to activate said main motor circuit for a predetermined time interval.
Claim 5
Dependent Claim
69 words
The suction pump control circuit as set forth in claim 1 in which: the second relay-actuated switch means is of a time-delay type operative upon actuation to remain actuated for a predetermined time interval following deactivation of the sensing circuit. 5 The suction pump control circuit as set forth in claim 3 in which: the coin-actuated switch is timed to remain closed for an interval of approximately 5 minutes.
References Cited (Backward Citations)
US2552749A
Cited
US3430730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |