Patent US4002223A successfully refreshed from Google Patents.
US4002223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescoping collapsible ladder
Assignee: FIREARMS IMPORT AND EXPORT CORP
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Filing: 1976-04-14
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Granted: 1977-01-11
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Expires: 1996-04-14
Abstract
Abstract A ladder is disclosed which includes telescoping sections that collapse and extend for adjusting the length of the ladder. The ladder is particularly useful on boats and may have curved upper ends on its side members for hooking the ladder over the side of a boat. The curved ends are rotatable for collapsing them toward the major plane of the ladder. Rotatable stand-off legs are also provided.
Inventors
- 👤 Keith David Bernkrant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:23
CPC Classifications
B; B63; B63B; B63B27/00; B63B27/14; E; E06; E06C; E06C1/00; E06C1/02; E06C1/34; E06C5/00; B63B2027/141
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
In a ladder comprising parallel side members and a plurality of parallel steps traversing said side members and affixed thereto, said ladder having a major plane, the improvements wherein: said side members each include a tubular female section and a male section in concentric, telescoping relation with said female section and collapsible and extendable with respect thereto; said male and female sections each comprising plastic pipe with said male sections fitting slidably inside said female sections; said side members each further including additional male and female telescoping sections of plastic pipe alternating along the length of said ladder; said side members further including joints between said male and female sections; and sleeves at said joints arranged in pairs embracing said steps; said male sections having enlarged ends; and one of said sleeves in each pair forming a stop for one of said enlarged ends; whereby said side members of said ladder may be telescopically adjusted between collapsed and extended positions for adjusting the length of said ladder.
Claim 2
Dependent Claim
167 words
In a ladder comprising parallel side members and a plurality of parallel steps traversing said side members and affixed thereto, said ladder having a major plane, the improvements wherein: said side members each include a tubular female section and a male section in concentric, telescoping relation with said female section and collapsible and extendable with respect thereto; said male and female sections each comprising plastic pipe with said male sections fitting slidably inside said female sections; said side members each further including additional male and female telescoping sections of plastic pipe alternating along the length of said ladder; said side members further including joints between said male and female sections; and sleeves at said joints arranged in pairs embracing said steps; said male sections having enlarged ends; and one of said sleeves in each pair forming a stop for one of said enlarged ends; whereby said side members of said ladder may be telescopically adjusted between collapsed and extended positions for adjusting the length of said ladder.
Claim 3
Dependent Claim
25 words
The ladder as claimed in claim 1 wherein: said steps each comprise a plastic extrusion having apertures at opposite ends thereof receiving respective female sections.
Claim 4
Dependent Claim
34 words
The ladder as claimed in claim 2 wherein: one end of each of said male sections is rigidly affixed to an adjoining female section other than the one with which said male section telescopes.
Claim 5
Dependent Claim
39 words
The ladder as claimed in claim 1 wherein: one of said sleeves on each of said side members is rotatable and has a stand-off leg affixed thereto; said stand-off legs being collapsible toward the major plane of said ladder.
Claim 6
Dependent Claim
30 words
The ladder as claimed in claim 4 wherein: one of said stand-off legs has an opening for receiving an end of the other stand-off leg when said legs are collapsed.
Claim 7
Dependent Claim
36 words
The ladder as claimed in claim 1 wherein: a pair of said female sections at the upper end of said ladder are curved to form hooks for hooking said ladder over the side of a boat.
Claim 8
Dependent Claim
23 words
The ladder as claimed in claim 6 wherein: said hooks are rotatable for collapsing the same toward the major plane of said ladder.
References Cited (Backward Citations)
US3653463A
Cited
US3858683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |