Patent US4143600A successfully refreshed from Google Patents.
US4143600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain attachment structure
Assignee: Holland Co
•
Filing: 1977-01-21
•
Granted: 1979-03-13
•
Expires: 1997-01-21
Abstract
Abstract A chain attachment structure interconnects the end of a chain to the takeup drum of a winch or hoist so that the chain load is applied directly to an integral part of the drum even if the chain is fully unwound. A recess extends inward from the periphery of the drum and includes a pair of spaced walls. A lug integral with one wall extends toward the opposite wall. The space between the lug and the opposite wall defines a path for inserting a chain link into the recess and over the lug. A keeper inserted into the path prevents removal of the link from the lug.
Inventors
- 👤 Emil J. Hlinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:16
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/28; B66D1/30; B66D1/34; Y; Y10; Y10T; Y10T24/00; Y10T24/21; Y10T24/2177
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
169 words
A releasable chain attachment structure for a load-bearing chain winding device, said structure including: a unitary, one-piece drum member having a periphery with a generally circular cross section; a recess extending inwardly from the periphery of the drum member defined between a spaced-apart interfacing pair of internal walls; a lug integral with said drum member extending part way from a first said internal wall toward the second internal wall; the distance between said lug and the second internal wall being larger than the chain link thickness so that a chain link can be inserted along a path in said recess and into registration with said lug; said lug being no larger than the interior of said link so that said link can be placed over said lug; and a keeper movable into said recess to obstruct said chain insertion path for retaining said link on said lug; the distance between the outermost end of said lug and the second internal wall being smaller than the side-to-side chain link width.
Claim 2
Dependent Claim
169 words
A releasable chain attachment structure for a load-bearing chain winding device, said structure including: a unitary, one-piece drum member having a periphery with a generally circular cross section; a recess extending inwardly from the periphery of the drum member defined between a spaced-apart interfacing pair of internal walls; a lug integral with said drum member extending part way from a first said internal wall toward the second internal wall; the distance between said lug and the second internal wall being larger than the chain link thickness so that a chain link can be inserted along a path in said recess and into registration with said lug; said lug being no larger than the interior of said link so that said link can be placed over said lug; and a keeper movable into said recess to obstruct said chain insertion path for retaining said link on said lug; the distance between the outermost end of said lug and the second internal wall being smaller than the side-to-side chain link width.
Claim 3
Dependent Claim
15 words
The structure of claim 1, said lug being located adjacent the mouth of said recess.
Claim 4
Dependent Claim
20 words
The structure of claim 2, further comprising a groove circumscribing said periphery, said mouth being in registration with said groove.
Claim 5
Dependent Claim
21 words
The structure of claim 1, said interfacing walls being generally parallel with a plane drawn through the axis of said drum.
Claim 6
Dependent Claim
158 words
A releasable chain attachment structure for a load-bearing chain winding device, said structure including: a unitary, one-piece drum member having a periphery with a generally circular cross section; a recess extending diametrically inwardly from the periphery of the drum member defined between a spaced-apart interfacing pair of internal walls; a lug integral with said drum member extending part way from a first said internal wall toward the second internal wall; the distance between the outermost end of said lug and the second internal wall being larger than the chain link thickness so that a chain link can be inserted along a generally diametric path of said drum member in said recess and into registration with said lug; said lug being no larger than the interior of said link so that said link can be placed over said lug; and a keeper movable into said recess to obstruct said chain insertion path for retaining said link on said lug.
Claim 7
Dependent Claim
158 words
A releasable chain attachment structure for a load-bearing chain winding device, said structure including: a unitary, one-piece drum member having a periphery with a generally circular cross section; a recess extending diametrically inwardly from the periphery of the drum member defined between a spaced-apart interfacing pair of internal walls; a lug integral with said drum member extending part way from a first said internal wall toward the second internal wall; the distance between the outermost end of said lug and the second internal wall being larger than the chain link thickness so that a chain link can be inserted along a generally diametric path of said drum member in said recess and into registration with said lug; said lug being no larger than the interior of said link so that said link can be placed over said lug; and a keeper movable into said recess to obstruct said chain insertion path for retaining said link on said lug.
Claim 8
Dependent Claim
15 words
The structure of claim 5, said lug being located adjacent the mouth of said recess.
Claim 9
Dependent Claim
20 words
The structure of claim 6, further comprising a groove circumscribing said periphery, said mouth being in registration with said groove.
Claim 10
Dependent Claim
21 words
The structure of claim 5, said interfacing walls being generally parallel with a plane drawn through the axis of said drum.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |