US3635442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air balancer safety system
Assignee: Ingersoll Rand Co
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Filing: 1969-10-08
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Granted: 1972-01-18
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Expires: 1989-10-08
Abstract
Abstract A balancing hoist control system including a pressure regulator valve and having a check valve located between the main air supply and the main inlet of the regulator valve and operative to close in response to a failure in the air supply, thereby preventing the air in the hoist from escaping from the main inlet. An air-operated piston member disables the regulator in the event of the loss of pressure of the air supply to prevent the regulator valve from exhausting the main balancing chamber of the hoist. This piston member also interconnects the main air supply chamber of the regulator valve with the pilot air chamber so that an operator can use the control member to slowly lower the load after the failure of the air supply without waiting for the repair of the air supply.
Inventors
- 👤 Otmar M Ulbing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:44
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/05; B; B66; B66D; B66D1/00; B66D1/02; B66D1/08; B66D2700/00; B66D2700/01; B66D2700/0125; B66D2700/0133; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/3056; F15B2211/30565; F15B2211/35; F15B2211/353; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7052; F15B2211/80; F15B2211/86; F15B2211/863; F15B2211/8633; F15B2211/8636; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7801
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
248 words
A balancing hoist control system for operating and controlling a balance hoist having a pressure-operated member for balancing a load on the hoist, said control system comprising: an air supply; a pilot-operated regulator valve having a main inlet connected to said air supply, a main outlet connected to said hoist member for supplying said hoist member with a controlled air pressure, and a pilot port adapted to receive a pilot air pressure for controlling the regulator valve and causing it to supply air pressure to said hoist member in response to the pilot air pressure; a control member connected to said pilot port to supply said pilot port with a controlled variable pilot air pressure; a check valve located between said main inlet in said regulator valve and said air supply and operative to seal said main inlet from said air supply in the event of a drop in pressure in said air supply; means operative to prevent said regulator valve from exhausting pressure from said main outlet in the event of a substantial drop in pressure in said air supply and the resulting closure of said check valve; and valve means operative, in response to a substantial drop in pressure of said air supply, to connect said main outlet to said pilot port whereby an operator can use said control member to bleed pressure from said hoist member at a controlled rate to slowly lower a load in the event of the failure of said air supply.
Claim 2
Dependent Claim
248 words
A balancing hoist control system for operating and controlling a balance hoist having a pressure-operated member for balancing a load on the hoist, said control system comprising: an air supply; a pilot-operated regulator valve having a main inlet connected to said air supply, a main outlet connected to said hoist member for supplying said hoist member with a controlled air pressure, and a pilot port adapted to receive a pilot air pressure for controlling the regulator valve and causing it to supply air pressure to said hoist member in response to the pilot air pressure; a control member connected to said pilot port to supply said pilot port with a controlled variable pilot air pressure; a check valve located between said main inlet in said regulator valve and said air supply and operative to seal said main inlet from said air supply in the event of a drop in pressure in said air supply; means operative to prevent said regulator valve from exhausting pressure from said main outlet in the event of a substantial drop in pressure in said air supply and the resulting closure of said check valve; and valve means operative, in response to a substantial drop in pressure of said air supply, to connect said main outlet to said pilot port whereby an operator can use said control member to bleed pressure from said hoist member at a controlled rate to slowly lower a load in the event of the failure of said air supply.
Claim 3
Dependent Claim
67 words
The control system of claim 1 wherein: said means for preventing said regulator valve from exhausting pressure from said main outlet in the event of a substantial drop in pressure in said air supply includes a piston operative, in response to the appearance of a differential pressure across the check valve, to move to a position preventing said regulator valve from exhausting pressure from said main outlet.
Claim 4
Dependent Claim
35 words
The control system of claim 2 wherein: said piston also includes said valve means for connecting said main outlet to said pilot port in response to a substantial drop in pressure of said air supply.
Claim 5
Dependent Claim
27 words
The control system of claim 3 wherein: said regulator valve includes a diaphragm and said piston is operative to engage said diaphragm to prevent it from moving.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |