Patent US3936622A successfully refreshed from Google Patents.
US3936622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load limiter
Assignee: CABLE CLIMBERS SAFETY DEVICES Inc A CORP OF OH
•
Filing: 1974-04-04
•
Granted: 1976-02-03
•
Expires: 1994-04-04
Abstract
Abstract A load limiter is provided for a lift hoist wherein the upper portion is fastened to the lift hoist and the lower portion is fastened to a load. A micro-switch is mounted on the upper half and actuated by movement of the lower half and is provided with an adjustment screw that can be adjusted to vary the load which will break a circuit of the lift hoist. The micro-switch is used in series with an operating switch to shut off the hoist motor when the load limit is reached to prevent damage to equipment or injury to personnel.
Inventors
- 👤 Robert C. McElroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:48
CPC Classifications
B; B66; B66B; B66B5/00; B66B5/02; B66B5/14; B66B5/145; B66D; B66D1/00; B66D1/54; B66D1/58; H; H01; H01H; H01H35/00; H01H35/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
A load limiter comprising a support member including spaced parallel vertically disposed side walls, spaced parallel, horizontally disposed top and bottom walls, an upper element affixed to said top wall for connection to a hoist, there being an opening in said bottom wall, a vertically disposed moveable rod extending through said opening and said rod having it's upper end threaded, a horizontally disposed vertically moveable plate mounted on the upper portion of said rod, stop guides on said side walls cooperating with said plate for preventing the spring from being deflected out of its proper position on over loads, means mounted above said plate adjustably engaging the upper end of said rod, a coil spring surrounding said rod and interposed between said plate and said bottom wall, a bracket mounted below said support member and said bracket including a pair of spaced parallel side sections and a bottom portion, means for connecting said bracket to a load, a top piece extending between said side sections and having the lower end of said rod extending therethrough, a vertically disposed support piece affixed to said support member, a micro-switch connected to said support piece, and an adjustment screw connected to the lower end of said micro-switch and to a lug on said upper element.
Claim 2
Dependent Claim
212 words
A load limiter comprising a support member including spaced parallel vertically disposed side walls, spaced parallel, horizontally disposed top and bottom walls, an upper element affixed to said top wall for connection to a hoist, there being an opening in said bottom wall, a vertically disposed moveable rod extending through said opening and said rod having it's upper end threaded, a horizontally disposed vertically moveable plate mounted on the upper portion of said rod, stop guides on said side walls cooperating with said plate for preventing the spring from being deflected out of its proper position on over loads, means mounted above said plate adjustably engaging the upper end of said rod, a coil spring surrounding said rod and interposed between said plate and said bottom wall, a bracket mounted below said support member and said bracket including a pair of spaced parallel side sections and a bottom portion, means for connecting said bracket to a load, a top piece extending between said side sections and having the lower end of said rod extending therethrough, a vertically disposed support piece affixed to said support member, a micro-switch connected to said support piece, and an adjustment screw connected to the lower end of said micro-switch and to a lug on said upper element.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |