US3751184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tube system with stand-by blower
Assignee: International Standard Electric Corp
•
Filing: 1971-11-10
•
Granted: 1973-08-07
•
Expires: 1991-11-10
Abstract
Abstract In a pneumatic tube system comprising one blower each for the vacuum intake air and the compressed air, a stand-by arrangement consisting of a stand-by blower, of two controlled valves and of four back-pressure valves is provided for increasing the operational reliability. Upon failure of one of the main blowers the supervisory elements associated with the main blowers serve to switch on the stand-by blower as well as the respective controlled valve. The corresponding back-pressure valves are opened or closed automatically by the air stream as produced by the stand-by blower.
Inventors
- 👤 F Buchwald
- 👤 D Pienkny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:33
CPC Classifications
B; B65; B65G; B65G51/00; B65G51/04; B65G51/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
In a pneumatic tube system incorporating a main vacuum intake air blower as well as a main compressed air blower for supplying the operating air, and further incorporating a single stand-by blower, the arrangement comprising a first controlled valve and a first back-pressure valve for coupling said stand-by blower in parallel relative to the main compressed air blower, a second controlled valve and a second back-pressure valve for coupling said stand-by blower in parallel relative to the main vacuum intake air blower, a third back-pressure valve provided on the vacuum side of the main vacuum intake air blower and a fourth back-pressure valve provided on the compressed air side of the compressed air blower.
Claim 2
Dependent Claim
114 words
In a pneumatic tube system incorporating a main vacuum intake air blower as well as a main compressed air blower for supplying the operating air, and further incorporating a single stand-by blower, the arrangement comprising a first controlled valve and a first back-pressure valve for coupling said stand-by blower in parallel relative to the main compressed air blower, a second controlled valve and a second back-pressure valve for coupling said stand-by blower in parallel relative to the main vacuum intake air blower, a third back-pressure valve provided on the vacuum side of the main vacuum intake air blower and a fourth back-pressure valve provided on the compressed air side of the compressed air blower.
Claim 3
Dependent Claim
37 words
The arrangement according to claim 1 wherein said first controlled valve is arranged on the vacuum side of the stand-by blower, and said second controlled valve is arranged on the compressed air side of the stand-by blower.
Claim 4
Dependent Claim
61 words
The arrangement according to claim 2 wherein said third and fourth back-pressure valves comprise control means for detecting a failure of one of the main blowers and for activating said stand-by blower to an operative condition and the controlled valve associated with the failed main blower to an open condition, and thereby maintaining normal system operation via a single stand-by blower.
Claim 5
Dependent Claim
320 words
In a pneumatic tube system operating with both compressed air and vacuum connections, in which there is incorporated a main vacuum intake air bloweR coupled between the vacuum connection and a system air exit and a main compressed air blower coupled between a system air entrance and the compressed air connection, the arrangement comprising a single stand-by blower operatively coupled in said pneumatic system for maintaining system operation in substitution of either of said main blowers in the event of failure of either one of the latter, said stand-by blower being associated with said main compressed air blower by being coupled firstly in parallel to said main compressed air blower between said system air entrance and said compressed air connection, and being associated with said main vacuum intake air blower by being coupled secondly in parallel to said main vacuum intake air blower between said vacuum connection and said system air exit, said first parallel coupling including a first controlled valve coupled between the system air entrance and the air intake side of said main compressed air blower and a first back-pressure valve coupled between the compressed air side of said main compressed air blower and said compressed air connection, said second parallel coupling including a second controlled valve coupled between the compressed air side of said stand-by blower and the system air exit and a second back-pressure valve coupled between said vacuum connection and the vacuum side of said stand-by blower, and further comprising control means, including third and fourth back-pressure valves coupled respectively between the compressed air side of said main compressed air blower and said compressed air connection and between said vacuum connection and the vacuum side of said vacuum intake air blower, for detecting a failure of one of the main blowers and for activating said stand-by blower to an operative condition and the controlled valve associated with the failed main blower to an open condition.
Claim 6
Dependent Claim
320 words
In a pneumatic tube system operating with both compressed air and vacuum connections, in which there is incorporated a main vacuum intake air bloweR coupled between the vacuum connection and a system air exit and a main compressed air blower coupled between a system air entrance and the compressed air connection, the arrangement comprising a single stand-by blower operatively coupled in said pneumatic system for maintaining system operation in substitution of either of said main blowers in the event of failure of either one of the latter, said stand-by blower being associated with said main compressed air blower by being coupled firstly in parallel to said main compressed air blower between said system air entrance and said compressed air connection, and being associated with said main vacuum intake air blower by being coupled secondly in parallel to said main vacuum intake air blower between said vacuum connection and said system air exit, said first parallel coupling including a first controlled valve coupled between the system air entrance and the air intake side of said main compressed air blower and a first back-pressure valve coupled between the compressed air side of said main compressed air blower and said compressed air connection, said second parallel coupling including a second controlled valve coupled between the compressed air side of said stand-by blower and the system air exit and a second back-pressure valve coupled between said vacuum connection and the vacuum side of said stand-by blower, and further comprising control means, including third and fourth back-pressure valves coupled respectively between the compressed air side of said main compressed air blower and said compressed air connection and between said vacuum connection and the vacuum side of said vacuum intake air blower, for detecting a failure of one of the main blowers and for activating said stand-by blower to an operative condition and the controlled valve associated with the failed main blower to an open condition.
References Cited (Backward Citations)
US2607297A
Cited
US2617477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |