Back to results
US 3,937,301 AGranted
Trailer having a self-lifting platform
OwnerPhilippe Bertailinventor
Life of this patent
Estimating the term…
Abstract
A trailer is provided with a self-lifting platform and comprises a vertical mast having vertical lifting supports spaced in the longitudinal direction of the trailer. Each lifting support carries a toothed rack and symmetrical independent lifting mechanisms for actuating roller stars which are in engagement with the rack teeth.
Claims7
In a trailer having a self-lifting platform supported by a rack mechanism and guided along a vertical mast consisting of superimposable elements and supported by the trailer, the improvement comprising:
- two vertical lifting supports which are part of the mast, said lifting supports being spaced in the longitudinal direction of the trailer, a plurality of struts spanning the space between the two vertical lifting supports to join said lifting supports together in the mast, said struts being arranged in regular, vertically spaced intervals along substantially the entire length of the mast, each lifting support including two, spaced, vertical uprights, a toothed rack associated with each lifting support, each toothed rack including a plurality of flat rack teeth, one end of each rack tooth being coupled with one vertical upright of the associated lifting support, the other end of each rack tooth being coupled with the other upright of the associated lifting support, each rack tooth thereby spanning the space between two uprights of each lifting support, the rack teeth of each toothed rack being vertically spaced along the associated lifting support, said platform being provided with two, symmetric, independent lifting mechanisms including two roller stars which are in engagement with the two toothed racks.
A trailer comprising:
- a. an elongated frame;
- b. a vertically movable platform;
- c. a rack mechanism supporting said platform;
- d. a vertical mast along which said platform is guided;
- e. said trailer including a transverse axle defining forward and rearward sides of said trailer;
- f. two, spaced, vertical lifting supports in said mast, one being disposed on said forward side of said trailer, the other being disposed on said rearward side, and a plurality of struts spanning the space between the vertical uprights to join said uprights together in said mast, said struts being arranged in regular, vertically spaced intervals along substantially the entire length of said mast;
- g. each lifting support including a pair of spaced vertical uprights spaced transversely with respect to the trailer frame, said pairs of vertical uprights defining a portion of said mast having a rectangular cross section;
- h. a first rack mechanism coupled with said pair of uprights of said forward lifting support, said first mechanism including a plurality of flat tooth members, one end of each tooth member being coupled with one vertical upright of said forward lifting support, the other end of each tooth member being coupled with the other upright of said forward lifting support, each tooth member thereby spanning the space between the two uprights of said forward lifting support, the tooth members of said first rack mechanism being vertically spaced along said first lifting support;
- i. a second rack mechanism coupled with said pair of uprights of said rearward lifting support, said second mechanism including, a plurality of flat, tooth members, one end of each tooth member being coupled with one vertical upright of said rearward lifting support, the other end of each tooth member being coupled with the other upright of said rearward lifting support, each tooth member thereby spanning the space between the two uprights of said rearward lifting support, the tooth members of said second rack mechanism being vertically spaced along said first lifting support;
- j. first and second lifting mechanisms, each lifting mechanism comprising an electric motor and a speed reducer, each lifting mechanism being mechanically independent of the other and each having a longitudinal axis, both of said lifting mechanisms being symmetrically arranged with respect to said mast and being so arranged that their longitudinal axes extend transversely with respect to the trailer frame;
- the longitudinal axis of said first lifting mechanism being located forwardly of said forward lifting support and the longitudinal axis of said second lifting mechanism being located rearwardly of said rearward lifting support;
- k. said first and second lifting mechanisms including, respectively, first and second roller stars, each roller star including a plurality of radially outwardly extending arms, each arm having a roller at the free end thereof;
- l. said rollers of said first roller star co-operating with said tooth members of said first first rack mechanism, and said roller of said second roller star co-operating with said tooth members of said second rack mechanism to support said platform and move the same vertically along said mast.
10 more elements
Dependencies are inferred from the claim text.