US3756466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure wash control system
Assignee: AERO WASH SYSTEMS Inc
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Filing: 1970-11-19
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Granted: 1973-09-04
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Expires: 1990-11-19
Abstract
Abstract A pressure washer comprising a power driven pump having a fluid receiving inlet connected to a low pressure fluid directing means and a fluid discharge outlet connected to high pressure fluid discharge means. The low pressure fluid discharge means comprises conduit means and has a regulator mounted thereto which serves to regulate fluid pressure passing through the conduit means. Control means and a chemical injector means are also mounted to the conduit means. The high pressure fluid discharge means comprises a second conduit means; a bypass valve fixture mounted to the second conduit means and a bypass conduit secured to the bypass valve fixture with its other end secured to the first conduit means to allow fluid from the second conduit means to flow into the first conduit means for recirculation when the fluid is at a predetermined pressure. Discharge means is connected to the second conduit means to allow for a washer spray discharge.
Inventors
- 👤 R Haase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:12
CPC Classifications
B; B60; B60S; B60S3/00; B60S3/04; B60S3/044
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
397 words
A pressure washer comprising a motor driven pump having a fluid receiving inlet connected to a low pressure fluid directing means and a fluid discharge outlet connected to high pressure fluid discharge means and control means connectEd to said low pressure fluid direction means, said low pressure fluid directing means comprising conduit means mounted to said pump, a pressure regulator mounted to said conduit means; said pressure regulator serving to regulate fluid pressure passing through said conduit means; and a chemical injector means mounted to said conduit means; said injector means comprising a venturi unit mounted to said conduit means, said venturi having a suction port, a second conduit means connected to said venturi and at least one chemical reservoir, selection valve means mounted in said second conduit means, said second conduit means having one end connected to said venturi adjacent said suction port and the other end connected to at least one reservoir so that each reservoir can selectively communicate with said first conduit means; said high pressure fluid discharge means comprising a third conduit means mounted to said pump; a bypass valve means mounted on said third conduit means; a bypass conduit having one end secured to said bypass valve means and the other end secured to said first conduit means; said bypass conduit allowing fluid from said third conduit means to flow into said first conduit means for recirculation when said fluid is at a predetermined pressure; and discharge nozzle means connected to said third conduit means, said control means being adapted to run and stop said pump and control the chemical flow from said injector means and comprising a circuit means, a latch relay connected to said circuit means and a pressure operated electric switch connected to said first conduit means and adapted to switch from an open contact position to a closed contact position when there is a pressure change in said first conduit means, said pressure switch being electrically connected by said circuit means to said pump motor and said selection valve means and adapted to activate said pump motor when said discharge nozzle is activated so that the water in the system flows causing a pressure drop closing the latch relay to alternate the position of said selection valve and to deactivate said pump motor when there is an increase in pressure caused by the deactivation of said discharge nozzle.
Claim 2
Dependent Claim
397 words
A pressure washer comprising a motor driven pump having a fluid receiving inlet connected to a low pressure fluid directing means and a fluid discharge outlet connected to high pressure fluid discharge means and control means connectEd to said low pressure fluid direction means, said low pressure fluid directing means comprising conduit means mounted to said pump, a pressure regulator mounted to said conduit means; said pressure regulator serving to regulate fluid pressure passing through said conduit means; and a chemical injector means mounted to said conduit means; said injector means comprising a venturi unit mounted to said conduit means, said venturi having a suction port, a second conduit means connected to said venturi and at least one chemical reservoir, selection valve means mounted in said second conduit means, said second conduit means having one end connected to said venturi adjacent said suction port and the other end connected to at least one reservoir so that each reservoir can selectively communicate with said first conduit means; said high pressure fluid discharge means comprising a third conduit means mounted to said pump; a bypass valve means mounted on said third conduit means; a bypass conduit having one end secured to said bypass valve means and the other end secured to said first conduit means; said bypass conduit allowing fluid from said third conduit means to flow into said first conduit means for recirculation when said fluid is at a predetermined pressure; and discharge nozzle means connected to said third conduit means, said control means being adapted to run and stop said pump and control the chemical flow from said injector means and comprising a circuit means, a latch relay connected to said circuit means and a pressure operated electric switch connected to said first conduit means and adapted to switch from an open contact position to a closed contact position when there is a pressure change in said first conduit means, said pressure switch being electrically connected by said circuit means to said pump motor and said selection valve means and adapted to activate said pump motor when said discharge nozzle is activated so that the water in the system flows causing a pressure drop closing the latch relay to alternate the position of said selection valve and to deactivate said pump motor when there is an increase in pressure caused by the deactivation of said discharge nozzle.
Claim 3
Dependent Claim
38 words
A pressure washer as claimed in claim 1, wherein said control means has a shock suppressor mounted thereto; said shock suppressor being positioned so that fluid passing from said first conduit means will first enter said shock suppressor.
Claim 4
Dependent Claim
43 words
A pressure washer as claimed in claim 1, wherein said first conduit means has a one-way check valve allowing fluid to pass through said regulator into said first conduit means while preventing fluid carried by the bypass conduit from flowing into said regulator.
Claim 5
Dependent Claim
359 words
A pressure washer comprising a motor driven pump having an inlet and an outlet, a first conduit means adapted to connect said inlet means to a source of fluid, a regulator secured to said first conduit means to regulate the pressure of fluid passing therethrough, a fixture secured to said conduit means; said fixture being adapted to direct fluid from said regulator toward said pump inlet and along a pressure sensitive switch conduit connected thereto, said pressure sensitive switch conduit having a shock suppressor and a pressure sensitive switch mounted thereon; said pressure sensitive switch being connected to circuit means leading to said pump motor and a solenoid valve means, said fixture also being connected to a bypass conduit and being adapted to receive fluid from said bypass conduit for recirculation through said first conduit means; injector means mounted to said first conduit means between said fixture and said pump inlet; said injector means comprising an aspirator apparatus, a fluid supply conduit connected to said aspirator apparatus; said fluid supply conduit also being connected to at least one chemical reservoir; solenoid valve means mounted in said supply conduit; said solenoid valve means being selectively opened and closed by said pressure sensitive switch contacting said circuit means to allow the flow of chemicals from each said chemical reservoir through said supply conduit into said injector means, a second conduit means secured to said pump outlet; a bypass valve fixture is mounted to said second conduit means; said bypass valve fixture being secured to said bypass conduit; a suppressor is mounted to said second conduit means between said bypass valve fixture and said pump outlet to control the flow of fluid discharged from said pump outlet and discharge means is secured to the end of said second conduit means, said discharge means comprising a hose having one end adapted to be mounted to said second conduit means and the other end connected to spray gun having a nozzle discharge means, the discharge means of said spray gun causing a pressure drop in said switch conduit which activates said pressure switch to start the pump motor and operate the solenoid valve means.
Claim 6
Dependent Claim
359 words
A pressure washer comprising a motor driven pump having an inlet and an outlet, a first conduit means adapted to connect said inlet means to a source of fluid, a regulator secured to said first conduit means to regulate the pressure of fluid passing therethrough, a fixture secured to said conduit means; said fixture being adapted to direct fluid from said regulator toward said pump inlet and along a pressure sensitive switch conduit connected thereto, said pressure sensitive switch conduit having a shock suppressor and a pressure sensitive switch mounted thereon; said pressure sensitive switch being connected to circuit means leading to said pump motor and a solenoid valve means, said fixture also being connected to a bypass conduit and being adapted to receive fluid from said bypass conduit for recirculation through said first conduit means; injector means mounted to said first conduit means between said fixture and said pump inlet; said injector means comprising an aspirator apparatus, a fluid supply conduit connected to said aspirator apparatus; said fluid supply conduit also being connected to at least one chemical reservoir; solenoid valve means mounted in said supply conduit; said solenoid valve means being selectively opened and closed by said pressure sensitive switch contacting said circuit means to allow the flow of chemicals from each said chemical reservoir through said supply conduit into said injector means, a second conduit means secured to said pump outlet; a bypass valve fixture is mounted to said second conduit means; said bypass valve fixture being secured to said bypass conduit; a suppressor is mounted to said second conduit means between said bypass valve fixture and said pump outlet to control the flow of fluid discharged from said pump outlet and discharge means is secured to the end of said second conduit means, said discharge means comprising a hose having one end adapted to be mounted to said second conduit means and the other end connected to spray gun having a nozzle discharge means, the discharge means of said spray gun causing a pressure drop in said switch conduit which activates said pressure switch to start the pump motor and operate the solenoid valve means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |