US3834492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable fire escape ladder
Assignee: American La France Inc
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Filing: 1973-08-27
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Granted: 1974-09-10
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Expires: 1993-08-27
Abstract
Abstract A portable fire escape ladder provides a window sill bracket with chains depending therefrom and a plurality of tubular rungs secured to the chains at spaced intervals therealong.
Inventors
- 👤 H Ronk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:39
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/52; E06C1/56; E06C1/02; E06C1/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A poratble fire escape ladder consisting of a pair of chains, means engagable on a window sill of a window opening supporting said chains and a plurality of rungs positioned between said chains, each of said rungs being formed of a tubular member the end portions of which are flattened so as to close the same and partially notched transversely substantially midway of the flattened portions so as to form inner and outer sections therein with transversely narrow sections therebetween, said outer sections being engaged in links of said chains and folded backwardly into engagement with said inner sections.
Claim 2
Dependent Claim
99 words
A poratble fire escape ladder consisting of a pair of chains, means engagable on a window sill of a window opening supporting said chains and a plurality of rungs positioned between said chains, each of said rungs being formed of a tubular member the end portions of which are flattened so as to close the same and partially notched transversely substantially midway of the flattened portions so as to form inner and outer sections therein with transversely narrow sections therebetween, said outer sections being engaged in links of said chains and folded backwardly into engagement with said inner sections.
Claim 3
Dependent Claim
24 words
The portable fire escape ladder of claim 1 and wherein said notches extend transversely less than half the width of said flattened end portions.
Claim 4
Dependent Claim
44 words
The poratble fire escape ladder of claim 1 and wherein the means engagable on said window sill consists of a pair of brackets having oppositely disposed downturned and inturned end portions, said chains being secured to one of said pairs of downturned end portions.
Claim 5
Dependent Claim
45 words
The portable fire escape ladder set forth in claim 1 and wherein said chains have elongated figure-eight shaped links and said narrow sections of said end portions are at least half the width of said end portions and engaged in said elongated figure-eight shaped links.
Claim 6
Dependent Claim
61 words
The portable fire escape ladder set forth in claim 1 and wherein said chains have elongated figure-eight shaped links and said outer sections of said flattened end portions are of substantially greater transverse width than the openings defined by said elongated figure-eight shaped links so that said links engage said notches and said outer sections form hooks engaged in said links.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |