Patent US3582128A successfully refreshed from Google Patents.
US3582128A
Expired / Lapsed
US
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Lifting tongs for handling heavy products
Assignee: Cockerill SA
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Filing: 1968-04-29
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Granted: 1971-06-01
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Expires: 1988-04-29
Abstract
Abstract Lifting tongs for handling heavy rigid loads such as coils of sheet metal comprise two gripping arms each provided with a lug for supporting said load and a suspension member with two pivots on which are articulated two pairs of arms crossed in scissors fashion articulated to said gripping arms so that the tongs may be pivoted in relation to said suspension member, by an angle of at least a few degrees, between certain limits determined by stops.
Inventors
- 👤 Ghislain Antoine Jean Martelee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:42
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/22; B66C1/28; B66C1/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
Lifting tongs for handling a heavy rigid load such as a coil of sheet metal, comprising two parallel movable gripping arms, a lug on each of said gripping arms for supporting said heavy rigid load, a suspension member for engaging a hook of a lifting device, a lower pivot on said suspension member, two arms connected between said lower pivot and said gripping arms, an upper pivot on said suspension member, two links connected between said arms and said upper pivot, a box carried on said upper pivot; biasing means in said box on both sides of said suspension member so that said gripping arms are pivotally movable on said lower pivot relative to said suspension member, said biasing means acting in opposition on said suspension member to normally maintain said suspension member in a neutral position between said biasing means, and stop means in said box on both sides of said suspension member for limiting said pivoting movement to an angle of approximately a few degrees.
Claim 2
Dependent Claim
167 words
Lifting tongs for handling a heavy rigid load such as a coil of sheet metal, comprising two parallel movable gripping arms, a lug on each of said gripping arms for supporting said heavy rigid load, a suspension member for engaging a hook of a lifting device, a lower pivot on said suspension member, two arms connected between said lower pivot and said gripping arms, an upper pivot on said suspension member, two links connected between said arms and said upper pivot, a box carried on said upper pivot; biasing means in said box on both sides of said suspension member so that said gripping arms are pivotally movable on said lower pivot relative to said suspension member, said biasing means acting in opposition on said suspension member to normally maintain said suspension member in a neutral position between said biasing means, and stop means in said box on both sides of said suspension member for limiting said pivoting movement to an angle of approximately a few degrees.
Claim 3
Dependent Claim
13 words
Lifting tongs as claimed in claim 1 wherein said biasing means are springs.
Claim 4
Dependent Claim
23 words
Lifting tongs as claimed in claim 2 wherein said springs are prestressed in order to return said suspension member to said neutral position.
Claim 5
Dependent Claim
17 words
Lifting tongs as claimed in claim 1 wherein said stop means are shoulders projecting in said box.
Claim 6
Dependent Claim
22 words
Lifting tongs as claimed in claim 1 wherein said suspension member is a rod carrying said lower pivot at its lower end.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |