Patent US3633770A successfully refreshed from Google Patents.
US3633770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for passing a product between zones of different pressure
Assignee: Lever Brothers Co
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Filing: 1969-09-08
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Granted: 1972-01-11
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Expires: 1989-09-08
Abstract
Abstract A device for transferring a product, such as food to be freezedried or puffed, between two zones of different pressure comprises a housing having an inlet and an outlet in communication with the respective zones, and also having a bore in which reciprocates a piston formed with a product-receiving pocket, at least two seals being provided between the piston and the bore, and located so that at least one seal is operative in any position of the piston reciprocation.
Inventors
- 👤 John Alban Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:38
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/40; B65G53/46; B65G53/4683
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
A device for transferring a product between two zones which are at different pressure, comprising a housing having an internal bore formed with an inlet spaced from an outlet, and with said inlet and outlet in communication each with one of said zones, a piston assembly slidable in said bore and formed with a product-carrying pocket, means for loading product into the pocket, means for reciprocating the piston assembly in said bore for the pocket to be placed alternately in communication with the inlet and the outlet of the housing, means for rotating the pistoN assembly in the housing bore, and about the axis of said bore, when the piston assembly is located with the pocket therein in communication with the outlet of the housing, two pressuretight seals between the piston assembly and the housing bore, located for at least one of said seals to be operative intermediate the inlet and the outlet in any position of the reciprocation of the piston assembly in the housing bore, and a pump connection in the housing, located to have communication with the pocket in the reciprocable piston assembly when the pocket is in an intermediate position between the inlet and the outlet of the housing, said pump connection being connectable with pumping means for adjusting the pressure in said pocket, the pump connection also being located in relation to the seals such that a pressuretight seal exists between the pump connection and the outlet when the pocket is in the inlet position.
Claim 2
Independent Claim
250 words
A device for transferring a product between two zones which are at different pressure, comprising a housing having an internal bore formed with an inlet spaced from an outlet, and with said inlet and outlet in communication each with one of said zones, a piston assembly slidable in said bore and formed with a product-carrying pocket, means for loading product into the pocket, means for reciprocating the piston assembly in said bore for the pocket to be placed alternately in communication with the inlet and the outlet of the housing, means for rotating the pistoN assembly in the housing bore, and about the axis of said bore, when the piston assembly is located with the pocket therein in communication with the outlet of the housing, two pressuretight seals between the piston assembly and the housing bore, located for at least one of said seals to be operative intermediate the inlet and the outlet in any position of the reciprocation of the piston assembly in the housing bore, and a pump connection in the housing, located to have communication with the pocket in the reciprocable piston assembly when the pocket is in an intermediate position between the inlet and the outlet of the housing, said pump connection being connectable with pumping means for adjusting the pressure in said pocket, the pump connection also being located in relation to the seals such that a pressuretight seal exists between the pump connection and the outlet when the pocket is in the inlet position.
Claim 3
Independent Claim
260 words
A device for transferring a product between two zones which are at different pressure, comprising a housing having an internal bore formed with an inlet spaced from an outlet, and with said inlet and outlet in communication each with one of said zones, a piston assembly slidable in said bore and formed with a product-carrying pocket, means for loading product into the pocket, means for reciprocating the piston assembly in said bore for the pocket to be placed alternately in communication with the inlet and the outlet of the housing, means for rotating the piston assembly in the housing bore, and about the axis of said bore, when the piston assembly is located with the pocket therein in communication with the outlet of the housing, and a pump connection in the housing, located to have communication with the pocket in the reciprocable piston assembly when the pocket is in an intermediate position between the inlet and the outlet of the housing, and sealing means for establishing a pressuretight seal intermediate the pump connection in the housing that the housing outlet, further sealing means comprising a plug member adapted to engage with one end of the piston assembly, spring means biasing said plug member in the axial direction of the housing bore, an O-ring located in said bore intermediate the pump connection and the outlet for engagement by the plug member to isolate the housing outlet form the pump connection, the plug member being engaged and moved away from the O-ring by the piston assembly during its reciprocation towards the outlet.
Claim 4
Independent Claim
260 words
A device for transferring a product between two zones which are at different pressure, comprising a housing having an internal bore formed with an inlet spaced from an outlet, and with said inlet and outlet in communication each with one of said zones, a piston assembly slidable in said bore and formed with a product-carrying pocket, means for loading product into the pocket, means for reciprocating the piston assembly in said bore for the pocket to be placed alternately in communication with the inlet and the outlet of the housing, means for rotating the piston assembly in the housing bore, and about the axis of said bore, when the piston assembly is located with the pocket therein in communication with the outlet of the housing, and a pump connection in the housing, located to have communication with the pocket in the reciprocable piston assembly when the pocket is in an intermediate position between the inlet and the outlet of the housing, and sealing means for establishing a pressuretight seal intermediate the pump connection in the housing that the housing outlet, further sealing means comprising a plug member adapted to engage with one end of the piston assembly, spring means biasing said plug member in the axial direction of the housing bore, an O-ring located in said bore intermediate the pump connection and the outlet for engagement by the plug member to isolate the housing outlet form the pump connection, the plug member being engaged and moved away from the O-ring by the piston assembly during its reciprocation towards the outlet.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |