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 Title: |
US4174021:
Ladder truck
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Barlock, Norman A.; Oakville, Canada
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| Assignee: |
Alnor Material Handling Limited Canada
other patents from ALNOR MATERIAL HANDLING LIMITED (20665) (approx. 1)
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| Published / Filed: |
1979-11-13
/ 1978-05-16
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| Application Number: |
US1978000906694
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| IPC Code: |
Advanced:
B62B 5/00;
E06C 1/397;
E06C 5/02;
Core:
E06C 1/00;
E06C 5/00;
more...
IPC-7:
B62B 5/04;
E06C 5/02;
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| ECLA Code: |
B62B5/00; E06C1/397; E06C5/02;
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| U.S. Class: |
Current:
182/017;
182/097;
182/127;
182/129;
280/163;
Original:
182/017;
182/097;
182/129;
182/127;
280/163;
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| Field of Search: |
182/015,17,127,97,96,95,106,129
280/163,291,150.5
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| Priority Number: |
| 1978-05-16 |
US1978000906694 |
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| Abstract: |
A ladder truck, e.g. for use in stores for transporting goods from central storage to display shelves and for facilitating the loading of such goods on display shelves, comprises a wheeled truck having attached to one end a stepladder. The stepladder is pivotally secured to one end, and has a first position in which it is wholly supported by the truck, clear of the ground, so that the truck can be wheeled around without interference from the stepladder and a second position in which the lowermost extremities of the stepladder engage the ground or floor surface, and take a portion of the weight of the truck, so that the adjacent wheels of the truck are raised clear of the supporting ground surface. Then, with the truck resting on a single wheel or pair of wheels and on the base of the stepladder, the truck is effectively locked against accidental rolling movement across the surface, and the stepladder can be safely mounted. The stepladder is easily moved from one position to another by simple manual operation.
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| Attorney, Agent or Firm: |
Hirons & Rogers ;
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| Primary / Asst. Examiners: |
Machado, Reinaldo P.;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Family: |
Show 2 known family members
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First Claim:
Show all 5 claims |
We claim:
1. A ladder truck comprising:
- a truck portion having first and second supporting wheel formations near opposed ends thereof, on which the ladder truck may be rolled across a surface;
- a step ladder movably secured to the truck portion at the first end thereof and having a single pair of downwardly extending surface engaging extremities;
- a pair of pivot arms pivotally connected at one end to the upper part of the first end of the truck portion and pivotally connected at the other end to an upper portion of the step ladder;
- said step ladder being movable relative to the truck portion by pivoting movement of said pivot arms in a vertical plane relative to both the truck portion and the step ladder, between:
- a first position in which the step ladder is supported by the truck portion with its downwardly extending extremities clear of the surface on which said wheel formations rest, so as to permit the ladder truck to be rolled across the surface on its wheeled formations, the pivot arms in said first position extending from their connection to the end of the truck portion to their connection to the step ladder in a direction upwardly and rearwardly towards the centre of the truck portion;
- an intermediate portion in which the pair of downwardly-extending extremities of the step ladder, and each of the supporting wheel formations, rest on said surface, the pivot arms in said intermediate position extending outwardly in a direction away from the truck portion;
- and a second position in which the downwardly-extending extremeties of the step ladder engage the surface and support a portion of the weight of the ladder truck thereon, with the first said supporting wheel formations raised out of engagement with the surface, the pivot arms in said second position extending from their connection to the end of the truck portion to their connection to the step ladder in a direction downwardly and rearwardly towards the centre of the truck.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 23 U.S. patent(s) that reference this one
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