US3656715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoist hook control
Assignee: DW Zimmerman Manufacturing Inc
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Filing: 1969-05-20
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Granted: 1972-04-18
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Expires: 1989-05-20
Abstract
Abstract A control is provided for maintaining a predetermined position of a hoist hook. The control is designed particularly for a pneumatically operated hoist of the type shown in U.S. Pat. No. 3,325,148. In a hoist of that type, when the hoist hook is at rest or inactive in a predetermined position over a period of time, whether or not loaded, the hook will tend to slowly drop as air in the hoist tends to dissipate and the pressure decreases. The new control supplies regulated air to the hoist chamber to maintain a constant pressure therein when the hoist is not being operated, to prevent lowering of the hook. This air is supplied directly to the chamber, by-passing the remotely operated controller used to raise and lower loads.
Inventors
- 👤 Edgar R Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:57
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/18; B66D2700/00; B66D2700/02; B66D2700/026; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2572
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
208 words
A hoist for raising and lowering loads, said hoist comprising a housing forming a gas chamber and a gas inlet communicating with the chamber, a piston in said housing forming an end of said chamber, a cable drum in said housing movable longitudinally of said housing with said piston, means in said housing rotatably supporting said drum, said drum to rotating when moved longitudinally; a control device comprising a body having a gas inlet passage, a gas outlet passage communicating with said gas inlet of said housing, flow control means associated with said passages to control the flow of gas therethrough, a first gas line communicating with said gas inlet passage, a second gas line communicating with said gas outlet passage, a regulator communicating between said inlet passage and said outlet passage to supply gas at a predetermined pressure from said inlet passage to said outlet passage independently of flow through said first and second gas lines; and a remote controller connected to said first and said second gas lines and having a first valve arranged to control flow from said first gas line to said second gas line, a vent, and a second valve to control the flow of gas from said second line to said vent.
Claim 2
Dependent Claim
208 words
A hoist for raising and lowering loads, said hoist comprising a housing forming a gas chamber and a gas inlet communicating with the chamber, a piston in said housing forming an end of said chamber, a cable drum in said housing movable longitudinally of said housing with said piston, means in said housing rotatably supporting said drum, said drum to rotating when moved longitudinally; a control device comprising a body having a gas inlet passage, a gas outlet passage communicating with said gas inlet of said housing, flow control means associated with said passages to control the flow of gas therethrough, a first gas line communicating with said gas inlet passage, a second gas line communicating with said gas outlet passage, a regulator communicating between said inlet passage and said outlet passage to supply gas at a predetermined pressure from said inlet passage to said outlet passage independently of flow through said first and second gas lines; and a remote controller connected to said first and said second gas lines and having a first valve arranged to control flow from said first gas line to said second gas line, a vent, and a second valve to control the flow of gas from said second line to said vent.
Claim 3
Dependent Claim
30 words
A hoist according to claim 1 characterized by said control device having externally adjustable means for controlling said regulator to adjust the outlet pressure of gas passing through said regulator.
Claim 4
Dependent Claim
18 words
A hoist according to claim 1 characterized further by said regulator having means for venting excess pressure therefrom.
Claim 5
Dependent Claim
33 words
A hoist according to claim 1 characterized by a check valve between said regulator and said outlet passage to prevent gas at high operating pressure in said outlet passage from reaching said regulator.
Claim 6
Dependent Claim
176 words
A pneumatically operated hoist for raising and lowering loads and including means forming a gas chamber with a gas inlet communicating therewith, and means responsive to the pressure of gas in said chamber for raising and lowering a load, a control device associated with said hoist comprising a body having gas inlet passage means for receiving a supply of gas, gas outlet passage means communicating with said gas inlet of said hoist, a first gas line communicating with said gas inlet passage means, a second gas line communicating with said gas outlet passage means, a gas controller connected to said first and second gas lines and having means to contrOl flow of gas from said first gas line to said second gas line and having means to vent gas from said hoist chamber, and a regulator connecting said inlet passage means and said outlet passage means to supply gas at a selected pressure from said inlet passage means to said outlet passage means independently of flow through said first and second gas lines and said controller.
Claim 7
Dependent Claim
176 words
A pneumatically operated hoist for raising and lowering loads and including means forming a gas chamber with a gas inlet communicating therewith, and means responsive to the pressure of gas in said chamber for raising and lowering a load, a control device associated with said hoist comprising a body having gas inlet passage means for receiving a supply of gas, gas outlet passage means communicating with said gas inlet of said hoist, a first gas line communicating with said gas inlet passage means, a second gas line communicating with said gas outlet passage means, a gas controller connected to said first and second gas lines and having means to contrOl flow of gas from said first gas line to said second gas line and having means to vent gas from said hoist chamber, and a regulator connecting said inlet passage means and said outlet passage means to supply gas at a selected pressure from said inlet passage means to said outlet passage means independently of flow through said first and second gas lines and said controller.
Claim 8
Dependent Claim
30 words
A hoist according to claim 5 characterized by said control device having externally adjustable means for controlling said regulator to adjust the outlet pressure of gas passing through said regulator.
Claim 9
Dependent Claim
18 words
A hoist according to claim 5 characterized further by said regulator having means for venting excess pressure therefrom.
Claim 10
Dependent Claim
35 words
A hoist according to claim 5 characterized by a check valve between said regulator and said outlet passage to prevent gas at high operating pressure in said gas outlet passage means from reaching said regulator.
Claim 11
Dependent Claim
150 words
A pneumatically operated hoist including means forming a power chamber with a gas inlet communicating therewith and means responsive to the pressure of gas in said chamber for raising and lowering a load, a control device associated with said hoist comprising a body having first passage means for receiving a supply of gas, second passage means communicating with said gas inlet of said hoist, controller means communicating between said first and second passage means for supplying gas from said first passage means to said second passage means and to said hoist chamber, said controller including means for venting gas from said hoist chamber, a regulator communicating with said first passage means upstream of said controller, said regulator communicating with said second passage means downstream of said controller, said regulator being effective to control gas pressure in said hoist chamber independently of said controller when said controller is not being operated.
Claim 12
Dependent Claim
150 words
A pneumatically operated hoist including means forming a power chamber with a gas inlet communicating therewith and means responsive to the pressure of gas in said chamber for raising and lowering a load, a control device associated with said hoist comprising a body having first passage means for receiving a supply of gas, second passage means communicating with said gas inlet of said hoist, controller means communicating between said first and second passage means for supplying gas from said first passage means to said second passage means and to said hoist chamber, said controller including means for venting gas from said hoist chamber, a regulator communicating with said first passage means upstream of said controller, said regulator communicating with said second passage means downstream of said controller, said regulator being effective to control gas pressure in said hoist chamber independently of said controller when said controller is not being operated.
Claim 13
Dependent Claim
25 words
A hoist according to claim 9 characterized further by said regulator having externally adjustable means to control the outlet gas pressure in said hoist chamber.
References Cited (Backward Citations)
US927016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |