Portable lift with ladder
OwnerSherman W. Bushnell, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A multi-stage extensible tower on a wheeled base with a platform at the top has an extensible multi-sectioned ladder which slopes downwardly uniformly from the platform when the tower and ladder are in extended position. When the tower and ladder are in lowered, retracted position, the ladder sections have different slopes from one another. Outriggers are provided on the base which have a retracted position preventing extension of the tower. The platform has a fence which can be swung down level with the platform for conditions of reduced overhead clearance while the unit is being moved.
Claims12
A lift comprising:
- a base,
- a multistage extensible mast mounted on the base, said mast having a top stage, and intermediate stage, and a bottom stage,
- a platform on the mast,
- a multi-sectioned extensible ladder to give access to said platform, said ladder having a top sloped section fixed to said top stage, an intermediate sloped section having a sliding fit at the upper end with said top section, and a bottom sloped section having a sliding fit at its upper end with said intermediate section, said bottom section being pivotally connected at its lower end to said base, and said intermediate section being pivotally mounted at its lower end to a brace connected to said intermediate stage of the mast,
- means for extending said mast, and
- means for extending said ladder responsive to extension of said mast.
A lift comprising:
- a base,
- a multistage extensible mast mounted on the base,
- a platform on the mast,
- a multi-sectioned extensible ladder to give access to said platform, said ladder having a section for each stage of the mast and the top section of the ladder being connected to the top stage of the mast,
- means for extending said mast,
- means for extending said ladder responsive to extension of said mast,
- a brace extending between said top section of the ladder and the top stage of the mast near the lower end thereof, and
- an outrigger slidably mounted on said base, said outrigger having a retracted position overlying said brace, thereby preventing extension of said mast and ladder, and having an extended position clear of said brace.
A lift comprising:
- a base,
- a multistage extensible mast having a top stage, a bottom stage mounted on the base, and at least one intermediate stage,
- means for extending the mast,
- a platform on the top stage,
- a multi-sectioned extensible ladder giving access to the platform, said ladder having a section for each stage of the mast, the top section of the ladder being connected to the top stage in fixed, sloped relation thereto, the bottom section of the ladder being pivotally connected to the base, and each of the remaining ladder sections being pivotally interconnected at its lower end in spaced relation to the respective mast stage, and
- roller means slidably and pivotally interconnecting the ladder sections, the ladder sections below the top section having the same slope as the top section when the ladder is fully extended and having successively lesser slopes when the ladder is retracted.
Dependencies are inferred from the claim text.