Safety scaffold for metal melting furnaces
AssigneeWestern Electric Company, Inc.
InventorWilliam B. Lazzari
Life of this patent
Estimating the term…
Abstract
A safety scaffold includes a platform (21) for supporting a workman while using jack hammer to remove encrustations (13) from a furnace wall (14). A pair of lanyards (29 and 31) are secured at first ends to a restraint worn by the workman, and at the opposite ends to a trolley (28) riding on a guide rail (27) so as to restrict movement of the workman toward an opening (23) in the platform. A duct system (24) is mounted beneath the platform (21) to exhaust fumes emanating from the furnace (11).
Claims4
A scaffold for supporting a workman with respect to a top opening in a metal melting furnace, which comprises:
- platform means of a size adapted to fit over and rest on the walls surrounding a furnace opening, said platform means having a central opening conforming to the opening in the furnace, and further including ducts extending around said platform opening having first vent openings facing the platform opening, and a second opening facing away from the platform opening;
- means secured about said second opening for exhausting fumes from said duct means;
- a plurality of spaced posts extending upwardly from the outer periphery of said platform means;
- a track secured to the posts and running from a first to a last of said posts to leave an entry between said first and last posts;
- a trolley mounted on and movable along the track;
- and
- lanyard means secured to the trolley and adapted to be attached to a workman on the platform means, said lanyard means being of such length as to restrict movement of the workman to positions adjacent to the platform opening.
A scaffold for mounting about the periphery of an opening formed in a supporting structure, which comprises:
- a platform having a centrally located opening conforming in size to the size of the opening in the structure;
- a first conduit secured to the underside of the platform, said conduit having a series of slots facing said platform opening, and a second slot facing away from said platform opening;
- a second conduit secured about said second opening and adapted to conduct fumes from the first conduit;
- a series of plates secured to and spaced about the underside of the platform;
- a plurality of posts individually secured to said plates and extending through said platform;
- a rail secured to the ends of the posts;
- a trolley mounted on said rail for movement therealong;
- and
- lanyards attached to said trolley and adapted to be secured to a restraint worn by a worker for limiting the worker's movement toward said platform opening.
A scaffold for use on a furnace having a vertically extending top opening, which comprises:
- a duct shaped to extend about the furnace opening, said duct having first slots facing the furnace opening and a second slot facing away from the furnace opening;
- a conduit secured to said duct about said second slot and adapted to conduct fumes from said duct;
- a platform mounted on said duct and having a central opening shaped to encompass the furnace opening;
- vertically mounted plates secured to the underside of the platform and spaced about the underside of the platform to extend radially from said platform opening;
- posts secured to the outer edges of the plates and extending upwardly about the outer periphery of the platform;
- a horizontal guide rail secured to the top of the posts and running from a first to a last of said posts to leave an entry opening between the first and last posts;
- a trolley means having two sets of rollers spanning the guide rails;
- lanyards attached to the trolley means and adapted to be attached to a workman on the platform to restrict the workman's movement toward the opening in said platform;
- and
- stop plates attached to the ends of the guide rails for confining movement of the trolley means to a path along said guide rail.
Dependencies are inferred from the claim text.