Patent US3727724A successfully refreshed from Google Patents.
US3727724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire escape ladder
Assignee: Individual
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Filing: 1971-11-01
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Granted: 1973-04-17
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Expires: 1991-11-01
Abstract
Abstract An improved fire escape ladder of a type adapted to be engaged with a window sill by straddling a lower edge thereof. The straddling means includes provision for adjustment in relation to the thickness of the wall mounting the window sill. The stiles of the ladder consist of conventional wire chain links, and the rungs are of hollow metallic tubing. Means is provided for connecting the rungs to the stiles whereby assembly may be accomplished with a minimum of hand labor using components which are of relatively low cost of manufacture.
Inventors
- 👤 S Shafer
- 👤 J Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:04
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/52; E06C1/56
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
150 words
In a fire escape ladder of a type including a pair of window sill engaging elements, and first and second link chain stiles supporting along the length of each stile thereof a plurality of hollow parallel rungs defining longitudinal bores therein, improved means for interconnecting said rungs to said stiles comprising a clip defining at least one elongated slot therein and having an outer dimension as measured between a pair of longitudinal edges thereof corresponding to the diameter of said bore, said slot engaging a link in said chain, said outer dimension engaging said bore, whereby the relation of the engaged link to the end of a given rung may be fixed; said clip including a trifurcated member defining a pair of interstices engaging a link of a chain stile, and an enlarged head of diameter greater than that of said bore, said trifurcated member being captivated within said bore.
Claim 2
Dependent Claim
150 words
In a fire escape ladder of a type including a pair of window sill engaging elements, and first and second link chain stiles supporting along the length of each stile thereof a plurality of hollow parallel rungs defining longitudinal bores therein, improved means for interconnecting said rungs to said stiles comprising a clip defining at least one elongated slot therein and having an outer dimension as measured between a pair of longitudinal edges thereof corresponding to the diameter of said bore, said slot engaging a link in said chain, said outer dimension engaging said bore, whereby the relation of the engaged link to the end of a given rung may be fixed; said clip including a trifurcated member defining a pair of interstices engaging a link of a chain stile, and an enlarged head of diameter greater than that of said bore, said trifurcated member being captivated within said bore.
Claim 3
Dependent Claim
30 words
Structure in accordance with claim 1, including a cap engaging the outer surface of a rung at an end thereof to close said bore and captivate said clip against displacement.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |