Patent US3722943A successfully refreshed from Google Patents.
US3722943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety hook
Assignee: Individual
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Filing: 1971-05-12
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Granted: 1973-03-27
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Expires: 1991-05-12
Abstract
Abstract A hook for use with crane blocks, lifting hoists, and the like, having a safety keeper for closing and locking the hook to prevent inadvertent release of a load. The hook is characterized by a pistol grip and trigger release mechanism included in the shank portion of the hook to facilitate convenient unlocking of the keeper and release of the load without requiring the operator to place his hands in the vicinity of the load bearing portion of the hook.
Inventors
- 👤 J Kalua
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:27
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/22; B66C1/34; B66C1/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
339 words
A safety hook comprising a body including a shank portion with a narrowed load bearing tip portion curving reentrantly upward therefrom in forward spaced relation thereto, a keeper member mounted at the upper end of said shank portion for pivotal movement relative thereto, said keeper member having a pointed end portion projecting forwardly and downwardly from said shank portion for engagement with said tip portion of said body and an opposite end portion projecting upwardly from said shank portion to define an extension thereof, said keeper member being pivotal between a closed position wherein said pointed end portion engages said tip portion and an open position wherein said pointed end portion is forwardly displaced from said tip portion, locking means carried by said shank portion for locking said keeper member in said closed position, said shank portion having a slot in its upper end and a central elongated aperture upwardly communicating with said slot, said aperture defining a pistol grip configuration, release means associated with said locking means for selectively releasing said keeper member for pivotal movement, said release means including a release trigger positioned adjacent said pistol grip configuration, said release trigger being disposed to depend into said aperture, said keeper member pivotally mounted at a position intermediate its length within said slot between the opposite side walls thereof, said keeper member having a tooth in its rear edge adjacent the pivotal mounting thereof, and said locking means and release means comprising a crank having first and second angularly related radial arms, said crank pivotally mounted between said side walls of said slot at a poSition rearwardly and downwardly displaced from said pivotal mounting of said keeper member and in overlying relation to said aperture, said first arm defining a dog engageable with said tooth in said closed position of said keeper member, said second arm defining said release trigger and depending into said aperture, and spring loading means acting between the base of said slot and said dog to resiliently urge same into engagement with said tooth.
Claim 2
Dependent Claim
339 words
A safety hook comprising a body including a shank portion with a narrowed load bearing tip portion curving reentrantly upward therefrom in forward spaced relation thereto, a keeper member mounted at the upper end of said shank portion for pivotal movement relative thereto, said keeper member having a pointed end portion projecting forwardly and downwardly from said shank portion for engagement with said tip portion of said body and an opposite end portion projecting upwardly from said shank portion to define an extension thereof, said keeper member being pivotal between a closed position wherein said pointed end portion engages said tip portion and an open position wherein said pointed end portion is forwardly displaced from said tip portion, locking means carried by said shank portion for locking said keeper member in said closed position, said shank portion having a slot in its upper end and a central elongated aperture upwardly communicating with said slot, said aperture defining a pistol grip configuration, release means associated with said locking means for selectively releasing said keeper member for pivotal movement, said release means including a release trigger positioned adjacent said pistol grip configuration, said release trigger being disposed to depend into said aperture, said keeper member pivotally mounted at a position intermediate its length within said slot between the opposite side walls thereof, said keeper member having a tooth in its rear edge adjacent the pivotal mounting thereof, and said locking means and release means comprising a crank having first and second angularly related radial arms, said crank pivotally mounted between said side walls of said slot at a poSition rearwardly and downwardly displaced from said pivotal mounting of said keeper member and in overlying relation to said aperture, said first arm defining a dog engageable with said tooth in said closed position of said keeper member, said second arm defining said release trigger and depending into said aperture, and spring loading means acting between the base of said slot and said dog to resiliently urge same into engagement with said tooth.
Claim 3
Dependent Claim
85 words
A safety hook according to claim 1, further defined by said tooth having a reentrantly notched leading edge and a gradually rearwardly and inwardly curved trailing edge terminating abruptly in the leading edge of a stop step engageable with said dog in said open position of said keeper member, said dog having a curved leading end engageable with said trailing edge of said first tooth during pivotal movement of said keeper member towards said closed position to urge said dog against said spring loading 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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |