US3738694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain door fastener
Assignee: National Manufacturing Co
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Filing: 1971-08-16
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Granted: 1973-06-12
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Expires: 1991-08-16
Abstract
Abstract A chain door fastener includes a door mounted bracket slotted to receive a link of a link chain fixed to a jamb mounted bracket, the slot being so configured as to prevent simple lifting of the link out of the slot and to prevent removal of the link from the slot while the chain is under tension.
Inventors
- 👤 G Banse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:57
CPC Classifications
E; E05; E05C; E05C17/00; E05C17/02; E05C17/04; E05C17/36; E05C17/365; Y; Y10; Y10T; Y10T24/00; Y10T24/45; Y10T24/45225; Y10T24/45969; Y10T292/00; Y10T292/28; Y10T292/283
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A chain door fastener of the type including a first member having a link chain fixed thereto and a bracket to which the chain may be removably secured, the improvement residing in said bracket and comprising a mounting flange and a slotted chain receiving body portion extending transversely thereto, said body portion having therein an irregular slot having a width exceeding the thickness of the links of said chain, said slot having a first section extending in a substantially horizontal direction and opening onto the outer edge of said body portion to permit insertion of a chain link through said first section only when said link is in a substantially horizontal position, and a second horizontal slot section disposed below said first section for supporting said link in a generally vertical position.
Claim 2
Dependent Claim
132 words
A chain door fastener of the type including a first member having a link chain fixed thereto and a bracket to which the chain may be removably secured, the improvement residing in said bracket and comprising a mounting flange and a slotted chain receiving body portion extending transversely thereto, said body portion having therein an irregular slot having a width exceeding the thickness of the links of said chain, said slot having a first section extending in a substantially horizontal direction and opening onto the outer edge of said body portion to permit insertion of a chain link through said first section only when said link is in a substantially horizontal position, and a second horizontal slot section disposed below said first section for supporting said link in a generally vertical position.
Claim 3
Dependent Claim
36 words
A chain door fastener according to claim 1 wherein said first section of said slot is spaced from the bottom edge of said body portion by a distance exceeding the maximum internal dimension of said links.
Claim 4
Dependent Claim
75 words
A chain door fastener according to claim 2 wherein said links are elongated, said second section is spaced from the bottom edge of said chain receiving portion by a distance exceeding the internal widths of said links, and a camming notch is provided in said bottom edge of said body portion for camming a link disposed in said slot into a horizontal position transverse to said chain receiving portion when said chain is pulled taut.
Claim 5
Dependent Claim
65 words
A chain door fastener according to claim 1 wherein said links are elongated, and said second section of said slot has an upper surface portion spaced from the bottom edge of said chain receiving body portion by a distance exceeding the internal length of said links to prevent manipulation of a link from the vertical to the horizontal position while engaged with said upper surface.
Claim 6
Dependent Claim
21 words
A chain door fastener according to claim 4 wherein said slot comprises a vertical section interconnecting said first and second sections.
Claim 7
Dependent Claim
43 words
A chain door fastener according to claim 5 comprising a cam surface interconnecting said upper surface portion of said second section with said vertical section for camming a link against said upper surface portion when said link is elevated against said cam surface.
Claim 8
Dependent Claim
45 words
A chain door fastener according to claim 5 wherein said vertical section of said slot is spaced from said outer edge of said body portion by a distance less than the internal length of said links and greater than the internal width of said links.
Claim 9
Dependent Claim
109 words
A chain door fastener according to claim 1 wherein said first member to which said chain is fixed comprises an integral member having upper and lower mounting flanges and a narrow section interconnecting said flanges, said narrow section having a width less than the internal dimension of the links of said chain and being formed to provide a recess on one side and a hook on the other side for receiving one of said links when said fastener is not in use, the end link of said chain surrounding and being fixedly secured to said narrow section, and said recess being deeper than the thickness of said end link.
Claim 10
Dependent Claim
27 words
A chain door fastener according to claim 8 wherein said first member is formed of metal and folded back on itself at the location of said hook.
Claim 11
Dependent Claim
56 words
A chain door fastener according to claim 1 wherein said bracket is an integral metallic member, and said chain receiving portion comprises an intermediate portion of said integral metallic member bent back on itself, whereby said distal edge is a rounded surface and said chain receiving portion is twice the thickness of said integral metallic member.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |