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US 5,636,705 AGranted
Apparatus for moving a work platform along a rail
OwnerAndre St-Germaininventor
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OwnerAndre St-Germaininventor
Estimating the term…
The scaffolding comprises a post having a plurality of vertically aligned and equally spaced studs protruding on one of its surfaces. A frame supporting a work platform can move along the post, a sleeve being attached to the frame for guiding it along the post. The sleeve, the frame and the work platform partially surround the post. A lifting apparatus, installed on the sleeve, comprises a rotatable endless screw which is parallel to the post and which has a peripheral and helical flange which bears on the studs. An engine, an electric power drill or a manual handle will rotate the endless screw via one or two speed reducers. The rotation movement of the endless screw will result in the axial displacement thereof along the post, carrying the frame and work platform along with it. Another embodiment of the invention comprises a work platform which is supported at both of its ends by a lifting apparatus movable along a post. If two or more work platforms work at a given time, two work platforms may share a same post between the two of them and nonetheless work independently. The rail is also equipped with protruding aligned and equally spaced studs on which an endless screw bears for axial displacement of the latter resulting from its rotation movement along the rail. The endless screw is parallel to the rail.
In combination, a work platform, an elongated rail member, and a moving apparatus movingly mounting said work platform along said rail member, said moving apparatus comprising a plurality of aligned, equally spaced stud members laterally protruding from said rail member, said elongated rail member defining a longitudinal axis, a sleeve member which at least partially surrounds said rail member for longitudinal movement therealong and to which is attached said work platform, an endless screw rotatably attached to said sleeve member for rotation about an axis parallel to the longitudinal axis of said rail member, said endless screw defining a peripheral helical flange, and power means for inducing a rotation movement to said endless screw, said peripheral flange bearing on at least two of said stud members for axial movement of said endless screw resulting from the rotation movement thereof;
A scaffolding comprising an upright rail member having a plurality of aligned, equally spaced stud members laterally protruding from said rail member, a sleeve member and a work platform secured to each other and at least partially surrounding said rail member for longitudinal movement therealong, an endless screw rotatably attached to said sleeve member and defining a peripheral helical flange, said endless screw having its rotation axis parallel to said rail member, power means for inducing a reversible rotation movement to said endless screw, said peripheral flange being bearing on at least two of said stud members for axial movement of said endless screw resulting from the rotation movement thereof, said power means and said endless screw being linked via at least one speed reducer which will impart slower speeds to said endless screw but will allow said work platform to lift greater loads for a same power output, said sleeve member having a plurality of pairs of idle wheels rotatably mounted thereon and bearing on said rail member to guide said sleeve member therealong.
A scaffolding comprising at least two spaced post members each having a plurality of aligned, equally and vertically spaced stud members and a work platform installed between said two post members, a sleeve member at each end of said work platform which at least partially surrounds a related one of said post members for longitudinal movement therealong, an endless screw rotatably attached to each one of said sleeve members and defining a peripheral helical flange, each of said endless screw having its rotation axis parallel to the related post member, power means for inducing a reversible rotation movement to said endless screws, said peripheral flange bearing on at least two of said stud members for axial movement of said endless screw resulting from the rotation movement thereof.
Dependencies are inferred from the claim text.