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US 6,662,902 B1Granted
Safety ladder scaffold
OwnerBarry K. McGuireinventor
Life of this patent
Estimating the term…
Abstract
A worker back support which is laterally and slidably attached to a scaffold plank. The back support has a grip which is releasably attached about the waist of the worker. The back support provides the worker with backward support and a safe attachment to the scaffold. A high pressure hose used for washing or sand blasting a wall surface may be attached to and braced by the back support, thereby reducing the working pressure on a worker.
Claims10
A safety ladder scaffold in combination with and attached to a pair of ladders by a ladder jack installed on each ladder, said ladder jacks adapted for supporting the scaffold in an elevated horizontal position intermediate the two spaced apart ladders resting on the ground and leaning against a generally flat wall surface, comprising:
- a plank assembly attached to said ladder jacks, said plank assembly being comprised of a metallic plank having an upper surface and a lower surface, said surfaces adapted to be lying in planes positioned horizontally and parallel with respect to the ground, said plank having a first long edge and a second long edge, said first long edge adapted to be nearest to the wall surface, said plank having a first lateral end opposite a second lateral end, said lateral ends defining a longitudinal axis of the plank, said plank longitudinal axis adapted to be lying horizontally parallel to said wall surface, said first long edge having a downwardly extending first flange terminating in an inward second flange extending toward the second long edge and having a plane parallel to the plank lower surface, said second flange extending approximately half way beneath said plank, said second long edge having a downwardly extending first flange terminating in an outward second flange extending away from the plank at an approximate 90° angle with the first flange, said second flange having a plane parallel with the plane of the plank lower surface, said second flange terminates in a third flange extending upwardly away from the second flange at an approximate 90° angle, said third flange having a plane parallel with the plane of the first flange, said three flanges forming a rectangular channel with the first and third flanges forming vertical sides, the second flange forming a horizontal bottom, and the channel having an open top, said second long edge first flange having an elongated, horizontal, central aperture formed therein, said aperture having a longitudinal axis parallel to the longitudinal axis of the plank, said second long edge third flange having an elongated, horizontal, central aperture formed therein, said aperture having a longitudinal axis parallel to the longitudinal axis of the plank, said apertures being parallel to each other;
- a back support attached to said plank assembly, comprising:
- a lower engagement portion comprising:
- a rectangular box having a top surface, bottom surface, two interconnecting, opposing parallel sides, and two opposing, parallel ends, said ends defining a box longitudinal axis, said box longitudinal axis being parallel to the longitudinal axis of the plank, wherein the box is adapted to fit into the said plank assembly channel, said box sides being positioned adjacent the second long edge first and third flanges, said box bottom surface being adjacent the second long edge second flange;
- and
- a plurality of side pins extending through each of the box sides, said side pins protruding from the sides and engaging the second long edge first and third flange apertures;
- an upper portion comprised of:
- a vertical post extending upwardly from the lower engagement portion box top surface;
- a sleeve slidably affixed to said post;
- a curved waist grip attached to the sleeve.
7 more elements
A safety ladder scaffold in combination with and attached to a pair of ladders by a ladder jack installed on each ladder, said ladder jacks adapted for supporting the scaffold in an elevated horizontal position intermediate the two spaced apart ladders resting on the ground and leaning against a generally flat wall surface, comprising:
- a plank assembly attached to said ladder jacks, said plank assembly comprising:
- a rectangular plank having an upper surface and a lower surface, said surfaces adapted to be lying in planes positioned horizontally and parallel with respect to the ground, said plank having a first long edge and a second long edge, said first long edge adapted to be nearest to the wall surface, said plank having a first lateral end opposite a second lateral end, said lateral ends defining a longitudinal axis of the plank, said plank longitudinal axis adapted to be lying horizontally parallel to said wall surface;
- an elongated, rectangular box fixedly attached to the plank lower surface, along and adjacent to the plank second long edge, said rectangular box having a top side attached to the plank lower surface, an opposite bottom side, a first open side, an opposite second side, said second side having an elongated, horizontal aperture formed therein, a first end and an opposite second end, said ends defining a longitudinal axis of the box, said box longitudinal axis being parallel to the plank longitudinal axis, said box sides and ends defining a box interior, said box having a length less than a length of the plank , said box being longitudinally centered along the plank longitudinal axis;
- a back support attached to said plank assembly, comprising:
- a lower engagement portion having a set of wheels rotatably attached to an elongated, horizontal cross bar, said cross bar having a horizontal, longitudinal axis parallel to the radial axis of the wheels;
- a vertical element attached to the cross bar by means of a horizontal offset piece, said horizontal offset piece having a horizontal, longitudinal axis perpendicular to the cross bar longitudinal axis, said cross bar and wheels being enclosed within the box interior, said offset piece protruding through the box second side aperture and joining the vertical element bottom, said vertical element containing a plurality of spring pin buttons in a longitudinal row along its surface;
- and
- an upper portion comprising
- an elongated sleeve element having a bottom, an upper end, a surface and a plurality of apertures in a longitudinal row along its surface, said sleeve element adapted to fit over said lower engagement portion vertical element, sleeve element bottom first, said upper portion apertures adapted to engage one or more lower engagement portion vertical element spring pin buttons;
- a curved back rest attached to the upper portion sleeve element upper end, said back rest having a top, a bottom, two lateral side ends, a first surface side and a second surface side, said first surface side facing the wall surface.
7 more elements
Dependencies are inferred from the claim text.