Patent US3907256A successfully refreshed from Google Patents.
US3907256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for lowering persons and loads
Assignee: Individual
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Filing: 1974-04-03
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Granted: 1975-09-23
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Expires: 1994-04-03
Abstract
Abstract The present invention concerns a device for lowering persons and loads. The braking mechanism of the device comprises two interconnected cylinders, one of which is filled with a liquid and the other with a gas. Lowering is performed by unwinding a cable or rope from a drum. Rotation of the drum causes, by means of a gear system, the piston of the cylinder filled with a liquid to move thereby pressing liquid into the second cylinder and moving the piston of this cylinder against the mounting counter pressure of the gas cushion therein. When this counter pressure equals the force exerted on the piston of the first cylinder by the cable load the unwinding stops. By providing the device with an additional bearing and means for selectively coupling the cable drum to said gear system, the device may be used as a safety device when working at high heights.
Inventors
- 👤 Kauko Valdemar Kankkunen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:05
CPC Classifications
A; A62; A62B; A62B1/00; A62B1/06; A62B1/08; A62B1/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
168 words
A device for lowering persons and loads, comprising a case having an opening for a cable or rope and having means for fastening the device to a stationary support; a cable drum rotatably mounted within said case; a cable wound on said drum and unwindable therefrom and having means for fastening the free end of the cable to the person or load to be lowered; means for rewinding the cable on said drum after the cable has been pulled off said drum; a first cylinder filled with a liquid and having a movable piston with a rod protruding from the cylinder and provided with a thread; a second cylinder filled with a gas and having a movable piston; nozzle means connecting said first cylinder with said second cylinder, means transferring rotary movement of said drum into movement of the piston within said first cylinder; an additional bearing driving said rotary movement transferring means; and means for selectively coupling said cable drum into driving engagement with said additional bearing.
Claim 2
Independent Claim
168 words
A device for lowering persons and loads, comprising a case having an opening for a cable or rope and having means for fastening the device to a stationary support; a cable drum rotatably mounted within said case; a cable wound on said drum and unwindable therefrom and having means for fastening the free end of the cable to the person or load to be lowered; means for rewinding the cable on said drum after the cable has been pulled off said drum; a first cylinder filled with a liquid and having a movable piston with a rod protruding from the cylinder and provided with a thread; a second cylinder filled with a gas and having a movable piston; nozzle means connecting said first cylinder with said second cylinder, means transferring rotary movement of said drum into movement of the piston within said first cylinder; an additional bearing driving said rotary movement transferring means; and means for selectively coupling said cable drum into driving engagement with said additional bearing.
Claim 3
Dependent Claim
32 words
A device according to claim 1, wherein said transferring means comprise a toothed rim on said additional bearing and gear means connecting said toothed rim to said piston of said first cylinder.
Claim 4
Dependent Claim
46 words
A device according to claim 1, wherein said means for selectively coupling the cable drum into driving engagement with said additional bearing comprise blocks mounted on said additional bearing, and catch means mounted on the cable drum and selectively engaging at least one of said blocks.
Claim 5
Dependent Claim
59 words
A device according to claim 3, wherein said catch means comprise a plurality of hooks arranged asymmetrically around the cable drum, each one of said hooks being pivotably mounted around a pin in such a way that the parts of the hook on different sides of said pin, in the direction of the drum circumference, are of different weights.
Claim 6
Dependent Claim
18 words
A device according to claim 4, wherein the heavier part of said hooks is supported by spring means.
Claim 7
Dependent Claim
54 words
A device according to claim 4, wherein the lighter part of each hook constitutes the block catching part and wherein at least one of said hooks is arranged to catch a block during rewinding of the cable on the drum, the end of the heavier part of said at least one hook being rounded.
References Cited (Backward Citations)
US1541590A
Cited
US1888912A
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US2594484A
Cited
US2853159A
Cited
US3595528A
Cited
US3760910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |