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Patent US3716307A successfully refreshed from Google Patents.
US3716307A
Expired / Lapsed
US
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Venturi head for vacuum systems
Assignee: KMS Industries Inc
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Filing: 1971-10-06
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Granted: 1973-02-13
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Expires: 1991-10-06
Abstract
Abstract A venturi-head for a vacuum system utilized as a source of negative pressure for vacuum cups and the like which has incorporated therein a safety shut off valve to hold vacuum in the vent of a failure of actuating jet stream and requiring a pressure release available only when pressure source is furnishing required pressure.
Inventors
- 👤 R Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:29
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0256; B66C1/0268; B66C1/0218; B66C1/0231; B66C1/0293
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
227 words
A fail safe vacuum head for lifting or holding which comprises: a. a body having formed therein a venturi passage with an inlet, an exhaust, and a low pressure working passageway leading to a vacuum passage, said venturi being activated by introduction of air pressure into said inlet, b. a check valve in said working passage between said vacuum outlet and said venturi, c. a valve seat in said working passage to function in conjunction with said check valve, d. resilient means biasing said check valve toward said seat to close said working passage in the direction of said vacuum passage, wherein said check valve opens against said bias when pressure in said vacuum passage overcomes said resilient means and closes when pressures are equalized on both sides of said valve in said working passageway to prevent pressurizing of said vacuum passage, e. a release passage in said body leading to said working passage between said valve seat and said vacuum passage, f. a second valve seat in said release passage, g. a second check valve in said release passage positioned to close said second seat in the direction away from said vacuum passage, and h. means resiliently to bias said second check valve against said second seat with a force greater than the force generated by atmospheric pressure during any vacuum sequence at said vacuum outlet.
Claim 2
Dependent Claim
227 words
A fail safe vacuum head for lifting or holding which comprises: a. a body having formed therein a venturi passage with an inlet, an exhaust, and a low pressure working passageway leading to a vacuum passage, said venturi being activated by introduction of air pressure into said inlet, b. a check valve in said working passage between said vacuum outlet and said venturi, c. a valve seat in said working passage to function in conjunction with said check valve, d. resilient means biasing said check valve toward said seat to close said working passage in the direction of said vacuum passage, wherein said check valve opens against said bias when pressure in said vacuum passage overcomes said resilient means and closes when pressures are equalized on both sides of said valve in said working passageway to prevent pressurizing of said vacuum passage, e. a release passage in said body leading to said working passage between said valve seat and said vacuum passage, f. a second valve seat in said release passage, g. a second check valve in said release passage positioned to close said second seat in the direction away from said vacuum passage, and h. means resiliently to bias said second check valve against said second seat with a force greater than the force generated by atmospheric pressure during any vacuum sequence at said vacuum outlet.
Claim 3
Dependent Claim
227 words
A fail safe vacuum head for lifting or holding which comprises: a. a body having formed therein a venturi passage with an inlet, an exhaust, and a low pressure working passageway leading to a vacuum passage, said venturi being activated by introduction of air pressure into said inlet, b. a check valve in said working passage between said vacuum outlet and said venturi, c. a valve seat in said working passage to function in conjunction with said check valve, d. resilient means biasing said check valve toward said seat to close said working passage in the direction of said vacuum passage, wherein said check valve opens against said bias when pressure in said vacuum passage overcomes said resilient means and closes when pressures are equalized on both sides of said valve in said working passageway to prevent pressurizing of said vacuum passage, e. a release passage in said body leading to said working passage between said valve seat and said vacuum passage, f. a second valve seat in said release passage, g. a second check valve in said release passage positioned to close said second seat in the direction away from said vacuum passage, and h. means resiliently to bias said second check valve against said second seat with a force greater than the force generated by atmospheric pressure during any vacuum sequence at said vacuum outlet.
Claim 4
Dependent Claim
227 words
A fail safe vacuum head for lifting or holding which comprises: a. a body having formed therein a venturi passage with an inlet, an exhaust, and a low pressure working passageway leading to a vacuum passage, said venturi being activated by introduction of air pressure into said inlet, b. a check valve in said working passage between said vacuum outlet and said venturi, c. a valve seat in said working passage to function in conjunction with said check valve, d. resilient means biasing said check valve toward said seat to close said working passage in the direction of said vacuum passage, wherein said check valve opens against said bias when pressure in said vacuum passage overcomes said resilient means and closes when pressures are equalized on both sides of said valve in said working passageway to prevent pressurizing of said vacuum passage, e. a release passage in said body leading to said working passage between said valve seat and said vacuum passage, f. a second valve seat in said release passage, g. a second check valve in said release passage positioned to close said second seat in the direction away from said vacuum passage, and h. means resiliently to bias said second check valve against said second seat with a force greater than the force generated by atmospheric pressure during any vacuum sequence at said vacuum outlet.
Claim 5
Dependent Claim
28 words
A device as defined in claim 1 in which means is provided to move said second check valve against said bias to admit pressure to said vacuum passage.
Claim 6
Dependent Claim
60 words
A devicE as defined in claim 1 in which an additional passage means is provided to connect said release passage to a source of pressure, and valve means in said additional passage to connect said release passage to a pressure source to move said second check valve to an open position against the resilient bias to pressurize the working passage.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |