US3760910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device
Assignee: Individual
•
Filing: 1972-04-14
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Granted: 1973-09-25
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Expires: 1992-04-14
Abstract
Abstract A safety device for preventing a worker working in a high place from falling. The device has a flat and hollow case and a rope outlet opening at the lower portion thereof. A rope winding reel is rotatably mounted in the case, and a rope has one end attached to the reel, the other end extending out of an outlet opening in the case. A spiral spring in the case biases the reel in a direction to wind the rope. Spring loaded pawls mounted on a rotatable disc adjacent the reel engage a ratchet wheel fixed concentrically within the pawls adjacent the reel. The inner periphery of the reel has lugs and recessed portions formed alternately at suitable intervals therearound, which engage the pawls to rock the pawls when the reel is turned. A brake system is provided between the disc and the case to brake the disc and properly dampen the disc when the disc is rotated.
Inventors
- 👤 A Koshihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:56
CPC Classifications
A; A62; A62B; A62B35/00; A62B35/0093; F; F16; F16D; F16D59/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
263 words
A safety device comprising a relatively flat hollow case having a rope outlet opening at the lower portion thereof, a fixed shaft secured within said case, a rope winding reel rotatably mounted on said fixed shaft, a rope having one end thereof attached to said reel and having the other end thereof passing out of said outlet opening; a spiral spring means mounted between said reel and said fixed shaft for imparting a turning force to said reel in a direction to wind said rope, disc shaped means rotatably mounted on said fixed shaft adjacent said reel; a plurality of rocking pieces pivotally mounted on said disc means; each of said rocking pieces having a pawl at one side of one end thereof and a rounded lug at the other side of said one end; a ratchet wheel concentrically fixed at one side of said reel adjacent said rocking pieces and having a plurality of ratchet pawls on the periphery thereof, said ratchet pawls being adapted to engage said pawls located at said ends of said rocking pieces; a plurality of lugs and a plurality of recessed portions alternately formed on the inner periphery of said reel and adapted to contact said rounded lugs of said rocking pieces; spring means normally urging each of said lugs of said rocking pieces towards said plurality of lugs and recessed portions and normally urging said pawls of said rocking pieces away from said ratchet pawls, and a brake system located between said disc means and said case for braking the rotary movement of said disc means.
Claim 2
Dependent Claim
263 words
A safety device comprising a relatively flat hollow case having a rope outlet opening at the lower portion thereof, a fixed shaft secured within said case, a rope winding reel rotatably mounted on said fixed shaft, a rope having one end thereof attached to said reel and having the other end thereof passing out of said outlet opening; a spiral spring means mounted between said reel and said fixed shaft for imparting a turning force to said reel in a direction to wind said rope, disc shaped means rotatably mounted on said fixed shaft adjacent said reel; a plurality of rocking pieces pivotally mounted on said disc means; each of said rocking pieces having a pawl at one side of one end thereof and a rounded lug at the other side of said one end; a ratchet wheel concentrically fixed at one side of said reel adjacent said rocking pieces and having a plurality of ratchet pawls on the periphery thereof, said ratchet pawls being adapted to engage said pawls located at said ends of said rocking pieces; a plurality of lugs and a plurality of recessed portions alternately formed on the inner periphery of said reel and adapted to contact said rounded lugs of said rocking pieces; spring means normally urging each of said lugs of said rocking pieces towards said plurality of lugs and recessed portions and normally urging said pawls of said rocking pieces away from said ratchet pawls, and a brake system located between said disc means and said case for braking the rotary movement of said disc means.
Claim 3
Dependent Claim
85 words
A safety device as claimed in claim 1 wherein said brake system comprises said disc means, a plurality of discs rotatable with said disc means, a plurality of brake plates fixedly mounted on said fixed shaft and arranged concentric to and alternating with said discs and said disc means, a spring means causing said brake plates to engage said discs and said disc means, and an adjusting member secured to one end of said fixed shaft for adjusting the elastic force of said spring means.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |