Patent US3595528A successfully refreshed from Google Patents.
US3595528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for lowering persons and loads
Assignee: Individual
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Filing: 1969-02-25
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Granted: 1971-07-27
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Expires: 1989-02-25
Abstract
Abstract The present invention concerns a device for lowering persons and loads comprising, rotatably journaled in a suitable device body, a rope drum from which a rope is discharged, to which the load to be lowered is fastened, and the rotation of which is hydraulically braked.
Inventors
- 👤 Jalmari Selim Virkki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:00
CPC Classifications
A; A62; A62B; A62B1/00; A62B1/06; A62B1/08; A62B1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A device for lowering persons and loads, comprising two parallel flanges having brackets for attachment to a wall, a shaft extending between said flanges, nuts carried by the ends of said shaft and firmly connecting said shaft to said flanges, a portion of said shaft between said flanges being square in cross section, a rope drum surrounding said shaft, end plates fixed to opposite ends of said drum and rotatably mounted on round opposed ends of said shaft, said drum having inner screw threads, a piston slidably mounted upon the square portion of said shaft and having outer screw threads meshing with said inner screw threads, said piston having an opening formed therein for the passage of hydraulic fluid adapted to fill the space enclosed by said drum, the portions of said shaft separated by said piston being adapted to carry oppositely wound rope ends.
Claim 2
Independent Claim
145 words
A device for lowering persons and loads, comprising two parallel flanges having brackets for attachment to a wall, a shaft extending between said flanges, nuts carried by the ends of said shaft and firmly connecting said shaft to said flanges, a portion of said shaft between said flanges being square in cross section, a rope drum surrounding said shaft, end plates fixed to opposite ends of said drum and rotatably mounted on round opposed ends of said shaft, said drum having inner screw threads, a piston slidably mounted upon the square portion of said shaft and having outer screw threads meshing with said inner screw threads, said piston having an opening formed therein for the passage of hydraulic fluid adapted to fill the space enclosed by said drum, the portions of said shaft separated by said piston being adapted to carry oppositely wound rope ends.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |