Patent US3777477A successfully refreshed from Google Patents.
US3777477A
Expired / Lapsed
US
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Self-locking for loop chains
Assignee: Italsider SpA
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Filing: 1971-11-26
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Granted: 1973-12-11
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Expires: 1991-11-26
Abstract
Abstract A simple but effective device for holding a chain looped around a bundle of elements in a tightened condition. A catch element is associated with an eyelet which is disposed at one end of the chain and through which the other end is passed. The catch is automatically shifted as the chain passes through the eyelet to reduce the size of the loop but moves back to a latching position to prevent the chain moving through the eyelet to enlarge the loop.
Inventors
- 👤 N Biondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:36
CPC Classifications
F; F16; F16G; F16G15/00; F16G15/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A lifting device comprising a chain for encircling a load, an eyelet at one end of said chain through which the opposite end of the chain is passed to form a loop and latch means pivoted to said eyelet, said latch means being movable between a first position to allow said eyelet end of the chain to run through the eyelet in the direction to tighten the loop and a second position to prevent passage of the chain through said eyelet in the direction to loosen said loop, said latch means comprising an abutment element cooperating with a link of said chain at said one end next to said eyelet whereby the latch means is urged towards said second position.
Claim 2
Dependent Claim
120 words
A lifting device comprising a chain for encircling a load, an eyelet at one end of said chain through which the opposite end of the chain is passed to form a loop and latch means pivoted to said eyelet, said latch means being movable between a first position to allow said eyelet end of the chain to run through the eyelet in the direction to tighten the loop and a second position to prevent passage of the chain through said eyelet in the direction to loosen said loop, said latch means comprising an abutment element cooperating with a link of said chain at said one end next to said eyelet whereby the latch means is urged towards said second position.
Claim 3
Dependent Claim
33 words
A lifting device as claimed in claim 1 wherein said eyelet comprises a shackle including a bolt passing through said link of said chain and said latch means is pivoted on said bolt.
Claim 4
Dependent Claim
26 words
The device as claimed in claim 2 wherein said latch means is provided with a pair of lugs through aligned holes of which said bolt passes.
Claim 5
Dependent Claim
26 words
A device as claimed in claim 3 wherein the latch means comprising a slate, the edge of said plate opposite said bolt having a concave shape.
Claim 6
Dependent Claim
31 words
A device as claimed in claim 2 wherein the latch means comprising a plate, the edge of said plate opposite to said bolt being as provided with a wear resistant insert.
Claim 7
Dependent Claim
146 words
A lifting device comprising a chain for encircling a load, an eyelet at one end of said chain through which the opposite end of the chain is passed to form a loop, said eyelet comprising a shackle having a bolt passing through the last link of said one end of said chain, a latch member pivoted on said bolt and movable between a first position to allow said opposite end of said chain to run through the eyelet in the direction to tighten the loop and a second position to prevent the passage of the chain through said eyelet in the direction to loosen said loop, said latch member having an abutment element at an end thereof adjacent to said bolt and cooperating with the link through which said bolt passes to limit movement of said latch means from said second position to said first position.
Claim 8
Dependent Claim
146 words
A lifting device comprising a chain for encircling a load, an eyelet at one end of said chain through which the opposite end of the chain is passed to form a loop, said eyelet comprising a shackle having a bolt passing through the last link of said one end of said chain, a latch member pivoted on said bolt and movable between a first position to allow said opposite end of said chain to run through the eyelet in the direction to tighten the loop and a second position to prevent the passage of the chain through said eyelet in the direction to loosen said loop, said latch member having an abutment element at an end thereof adjacent to said bolt and cooperating with the link through which said bolt passes to limit movement of said latch means from said second position to said first position.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |