US4618027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folding ladder with three stiles
Assignee: CASTILIA SpA
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Filing: 1985-10-22
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Granted: 1986-10-21
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Expires: 2005-10-22
Abstract
Abstract A ladder comprises a pair of main stiles, a series of centrally-hinged rungs with ends articulated to the two main stiles, whereby the ladder can adopt a folded inoperative configuration in which the main stiles are alongside each other and an extended operative configuration in which the main stiles are spaced from each other, and means for stopping the ladder in the extended operative configuration. The main stiles are articulated together at their upper ends and the ladder further includes a single auxiliary stile articulated at its upper end to the two upper ends of the main stiles about an axis substantially perpendicular to the articulation axis of the two main stiles. The auxiliary stile is movable between a position alongside the two main stiles, corresponding to the folded inoperative condition of the ladder, and a position spaced from the main stiles, corresponding to the extended operative condition of the ladder.
Inventors
- 👤 Giancarlo Piretti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:10
CPC Classifications
E; E06; E06C; E06C1/00; E06C1/02; E06C1/38; E06C1/383; E06C1/3835; E06C1/005; E06C1/382
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
A ladder comprising: a pair of main stiles; a series of rungs with central hinges and ends articulated to the two main stiles, whereby the ladder can adopt a folded inoperative configuration in which the main stiles are alongside each other and an extended operative configuration in which the main stiles are spaced from each other, and means for stopping the ladder in the extended operative configuration, wherein the main stiles are articulated together at their upper ends about an axis and the ladder further includes a single auxiliary stile articulated at its upper end to the two upper ends of the main stiles about an axis substantially perpendicular to the articulation axis of the two main stiles, the auxiliary stile being movable between a position alongside the two main stiles, corresponding to the folded inoperative condition of the ladder, and a position spaced from the main stiles, corresponding to the extended operative condition of the ladder.
Claim 2
Dependent Claim
157 words
A ladder comprising: a pair of main stiles; a series of rungs with central hinges and ends articulated to the two main stiles, whereby the ladder can adopt a folded inoperative configuration in which the main stiles are alongside each other and an extended operative configuration in which the main stiles are spaced from each other, and means for stopping the ladder in the extended operative configuration, wherein the main stiles are articulated together at their upper ends about an axis and the ladder further includes a single auxiliary stile articulated at its upper end to the two upper ends of the main stiles about an axis substantially perpendicular to the articulation axis of the two main stiles, the auxiliary stile being movable between a position alongside the two main stiles, corresponding to the folded inoperative condition of the ladder, and a position spaced from the main stiles, corresponding to the extended operative condition of the ladder.
Claim 3
Dependent Claim
31 words
A ladder as defined in claim 1, wherein each rung has stop surfaces at its ends for cooperating with the main stiles to hold each rung in the extended operative configuration.
Claim 4
Dependent Claim
47 words
A ladder as defined in claim 1, wherein the stop means include a tie rod having one end articulated to one of the rungs of the ladder, and a longitudinal guide groove in the auxiliary stile in which the opposite end of the tie rod is slidable.
Claim 5
Dependent Claim
28 words
A ladder as defined in claim 1, wherein the two main stiles are formed by two profiled elements of channel section, with the channels open towards each other.
Claim 6
Dependent Claim
35 words
A ladder as defined in claim 4, wherein the two main stiles define a pair of recesses in two respective longitudinal edges which are alongside each other in the folded inoperative condition of the ladder.
Claim 7
Dependent Claim
34 words
A ladder as defined in claim 1, wherein the ladder has auxiliary appendages and a support base for allowing the ladder to be used as a coat stand when in its folded inoperative condition.
Claim 8
Dependent Claim
44 words
A ladder as defined in claim 6, wherein two of the stiles have respective apertures and the auxiliary appendages are each defined by a single element passing through said apertures and having ends in the form of coat hooks located outside the two stiles.
Claim 9
Dependent Claim
28 words
A ladder as defined in claim 7, wherein each of the elements constituting the auxiliary appendages has at least an intermediate portion in the form of a strip.
Claim 10
Dependent Claim
27 words
A ladder as defined in claim 6, wherein the support base has a seat for receiving the lower ends of the ladder stiles with a positive fit.
Claim 11
Dependent Claim
36 words
A ladder as defined in claim 9, wherein the two vertical projections are provided in the seat of the support base and the lower end of each stile has a socket for one of the projections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |