Patent US3800912A successfully refreshed from Google Patents.
US3800912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Access equipment
Assignee: Simon Engineering Dudley Ltd
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Filing: 1972-07-24
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Granted: 1974-04-02
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Expires: 1992-07-24
Abstract
Abstract Access equipment having an articulated boom structure comprising two or more booms pivoted end to end, the lowermost boom being pivotally mounted on a supporting structure such as a vehicle, the boom structure being movable between a stowed position wherein said boom are located adjacent the supporting structure and a working position wherein the free end of the boom structure is raised to an elevated position above the supporting structure, characterised by the provision of a ladder extending alongside each of a pair of adjacent booms, said ladders being arranged on opposite sides respectively of said pair of booms and there being a landing at the knuckle joint between said booms and extending between the two ladders so as to provide easily negotiable means for a person to pass from one ladder to the other.
Inventors
- 👤 D Ashworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:24
CPC Classifications
B; B66; B66F; B66F11/00; B66F11/04; B66F11/044
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
Access equipment comprising a boom assembly wherein upper and lower booms are transversely pivotally interconnected at a knuckle joint, said booms being relatively movable about the pivot at said joint between a folded position and an extended position wherein said upper boom extends upwardly from an end of the lower boom, ladders mounted on and extending substantially the length of each boom, said ladders being disposed on opposite sides of the respective booms and having adjacent ends at said knuckle joint spaced apart transversely of the boom assembly, and means providing a landing mounted on said boom assembly at said knuckle joint extending transversely of the boom assembly substantially between the adjacent ladder ends whereby to provide easily negotiable access between said ladders in the extended position of said booms.
Claim 2
Dependent Claim
130 words
Access equipment comprising a boom assembly wherein upper and lower booms are transversely pivotally interconnected at a knuckle joint, said booms being relatively movable about the pivot at said joint between a folded position and an extended position wherein said upper boom extends upwardly from an end of the lower boom, ladders mounted on and extending substantially the length of each boom, said ladders being disposed on opposite sides of the respective booms and having adjacent ends at said knuckle joint spaced apart transversely of the boom assembly, and means providing a landing mounted on said boom assembly at said knuckle joint extending transversely of the boom assembly substantially between the adjacent ladder ends whereby to provide easily negotiable access between said ladders in the extended position of said booms.
Claim 3
Dependent Claim
17 words
Access equipment as defined in claim 1, wherein said landing is pivotally mounted on said lower boom.
Claim 4
Dependent Claim
59 words
Access equipment as defined in claim 2, comprising a vehicle turntable on which the lower boom as pivoted at the end opposite said knuckle joint, and a rod pivotally connected at opposite ends between said turntable and said landing to form a parallelogram linkage system whereby said landing is maintained substantially level during relative angular movements of said booms.
Claim 5
Dependent Claim
32 words
Access equipment as defined in claim 1, wherein a working platform is pivotally mounted upon the free end of said upper boom adjacent the end of the ladder mounted on that boom.
Claim 6
Dependent Claim
43 words
Access equipment as defined in claim 4, comprising a parallelogram linkage system that includes said landing and is connected to said working platform whereby both said landing and said working platform are maintained substantially level for any relative angular positions of said booms.
Claim 7
Dependent Claim
16 words
Access equipment according to claim 1 wherein each of said ladders is provided with a handrail.
Claim 8
Dependent Claim
50 words
Access equipment according to claim 6 wherein each of said ladders is hingedly connected with its associated boom along its length whereby it can be folded between an operative position and a stowed position wherein the ladder and the handrail are juxtaposed with two sides of its associated boom respectively.
Claim 9
Dependent Claim
21 words
Apparatus according to claim 1 wherein the lowermost end of the boom structure is pivotally connected with a vehicle mounted turntable.
Claim 10
Dependent Claim
35 words
Access equipment as defined in claim 1, comprising a parallelogram linkage system that includes said landing as an element thereof whereby said landing is maintained substantially level for any relative angular positions of said booms.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |