Patent US3765652A successfully refreshed from Google Patents.
US3765652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable hoist
Assignee: Emerson Electric Co
•
Filing: 1971-04-09
•
Granted: 1973-10-16
•
Expires: 1991-04-09
Abstract
Abstract A cable hoist is provided which has a frame and a drum in the frame to which a cable is attached and a ratchet wheel secured to the drum. A handle mounted on the frame carries a ratchet pawl for engagement with the ratchet wheel. A holding pawl mounted in the frame cooperates with the ratchet pawl and wheel to enable the drum to be ratcheted and wind up the cable. A disc is disposed alongside the ratchet wheel and has notches in it which correspond to a lesser number of teeth than are on the ratchet wheel. The holding pawl can be moved laterally to cause it to extend over the disc as well as the ratchet wheel and the disc will hold the holding pawl out of engagement with some of the teeth of the ratchet wheel to allow the cable to unwind from the drum under control of the handle several teeth at a time.
Inventors
- 👤 A Janik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:24
CPC Classifications
B; B66; B66D; B66D3/00; B66D3/12; B66D3/14; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1558; Y10T74/1565; Y10T74/1576
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
386 words
A hoist of the class described wherein a flexible load engaging member is secured to a spool disposed in a frame and the spool has end flanges with ratchet teeth on at least one of the flanges to form a ratchet wheel and ratchet means for turning the spool includes a pivoted handle and a ratchet pawl carried by the handle for engagement with the teeth on the ratchet wheel and a holding pawl is carried by the frame and operates in conjunction with the ratchet pawl and ratchet wheel to control the movement of the spool for raising and lowering a load, the improvement in means for rapidly lowering a load which comprises holding pawl disengaging means extending alongside the ratchet wheel for holding the pawl from engagement with the ratchet wheel for a lesser number of teeth then are on the ratchet wheel and means for holding said pawl for lateral movement in said frame and means for moving said holding pawl laterally in said frame into operative engagement with the holding pawl disengaging means; the means for moving the holding pawl laterally on the shaft comprises a cam means rotatably disposed on the shaft and said holding pawl has a cam engaging surface and said cam means is disposed in engagement with said cam engaging surface; said holding pawl is provided with a hub and said cam surface is formed on the end of the hub; said cam means includes a lever carried on a hub and said cam is formed on the end of the hub toward the holding pawl means: a shaft is disposed in the frame and the holding pawl is rotatably disposed on the shaft and a first spring means is disposed around the shaft and has one end connected to the holding pawl and the other end fixedly held for urging the holding pawl into engagement with the ratchet wheel, a second spring is disposed around the shaft and has one end connected to the holding pawl and the other end disposed in the path of the ratchet pawl to rotate the holding pawl out of engagement with the ratchet gear; a third spring is disposed around the shaft between the cam lever hub and the frame to hold the cam in engagement with the cam engaging surface.
Claim 2
Dependent Claim
386 words
A hoist of the class described wherein a flexible load engaging member is secured to a spool disposed in a frame and the spool has end flanges with ratchet teeth on at least one of the flanges to form a ratchet wheel and ratchet means for turning the spool includes a pivoted handle and a ratchet pawl carried by the handle for engagement with the teeth on the ratchet wheel and a holding pawl is carried by the frame and operates in conjunction with the ratchet pawl and ratchet wheel to control the movement of the spool for raising and lowering a load, the improvement in means for rapidly lowering a load which comprises holding pawl disengaging means extending alongside the ratchet wheel for holding the pawl from engagement with the ratchet wheel for a lesser number of teeth then are on the ratchet wheel and means for holding said pawl for lateral movement in said frame and means for moving said holding pawl laterally in said frame into operative engagement with the holding pawl disengaging means; the means for moving the holding pawl laterally on the shaft comprises a cam means rotatably disposed on the shaft and said holding pawl has a cam engaging surface and said cam means is disposed in engagement with said cam engaging surface; said holding pawl is provided with a hub and said cam surface is formed on the end of the hub; said cam means includes a lever carried on a hub and said cam is formed on the end of the hub toward the holding pawl means: a shaft is disposed in the frame and the holding pawl is rotatably disposed on the shaft and a first spring means is disposed around the shaft and has one end connected to the holding pawl and the other end fixedly held for urging the holding pawl into engagement with the ratchet wheel, a second spring is disposed around the shaft and has one end connected to the holding pawl and the other end disposed in the path of the ratchet pawl to rotate the holding pawl out of engagement with the ratchet gear; a third spring is disposed around the shaft between the cam lever hub and the frame to hold the cam in engagement with the cam engaging surface.
Claim 3
Dependent Claim
30 words
An apparatus as described in claim 1 wherein first spring means is of open convolution and said third spring means has greater resistance to compression than the first 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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |