Patent US3754462A successfully refreshed from Google Patents.
US3754462A
Expired / Lapsed
US
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Infusor drive means
Assignee: Seeburg Corp
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Filing: 1971-09-28
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Granted: 1973-08-28
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Expires: 1991-09-28
Abstract
Abstract An infusor apparatus for a coffee brewing machine has a cam driven piston means. The cam has appropriate dwells formed thereon to interrupt the travel of the piston means during the compression stroke approximately halfway along the stroke and again at the completion thereof, in order to relieve the pressure within the chamber during and after brewing so that infusible or brewed material will not be blown from the chamber when it is suddenly opened after brewing is completed.
Inventors
- 👤 F Brill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:22
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
In an infusor apparatus for brewing coffee and the like comprising a brewing chamber in which infusible material and a liquid jet stream are combined and comprising reciprocable piston means to decrease the volume within the brewing chamber, an improvement in the drive means to activate said piston means comprising: cam means having at least two dwell portions, wherein said first dwell portion causes the travel of said piston means to be interrupted intermediate the ends of its compression stroke for a sufficient time to permit the completion of the breWing of the infusible material; and wherein said second dwell portion causes the travel of the piston means to be interrupted at the end of its compression stroke and before the initiation of its exhaust stroke for a sufficient time to permit the pressurized liquid to be expelled from the the bottom of the chamber and to permit the pressure built-up within said brewing chamber to be dissipated through the bottom of the brewing chamber until the pressure within the chamber is equalized with the ambient pressure.
Claim 2
Dependent Claim
177 words
In an infusor apparatus for brewing coffee and the like comprising a brewing chamber in which infusible material and a liquid jet stream are combined and comprising reciprocable piston means to decrease the volume within the brewing chamber, an improvement in the drive means to activate said piston means comprising: cam means having at least two dwell portions, wherein said first dwell portion causes the travel of said piston means to be interrupted intermediate the ends of its compression stroke for a sufficient time to permit the completion of the breWing of the infusible material; and wherein said second dwell portion causes the travel of the piston means to be interrupted at the end of its compression stroke and before the initiation of its exhaust stroke for a sufficient time to permit the pressurized liquid to be expelled from the the bottom of the chamber and to permit the pressure built-up within said brewing chamber to be dissipated through the bottom of the brewing chamber until the pressure within the chamber is equalized with the ambient pressure.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |