Abstract: A portable work platform or basket adaptable to wellhead valve flanges at a point above the blowout preventors thereby providing 360-degree personnel access to the wellhead during work-over and snubbing operations. The platform includes handrails, kick plates and an assortment of pipe flange adaptors for coupling to a variety of wellhead configurations. The platform further includes a pivotal arm for attaching a retractable personnel tether reel or a pulley block for a wench cable.

Abstract: Tree stands that may be removeably and replaceably attached to tree trunks having a wide variety of diameters are described. Tree stands that provide 360° platforms are also described. According to one exemplary embodiment, a tree stand may include a platform, a collar that may be removeably and replaceably attached to a tree trunk and that may include multiple first receiving portions, and multiple support bars supporting the platform on the collar. The multiple support bars may be removeably and replaceably insertable into the multiple first receiving portions.

Abstract: A scaffolding system for volumes of various shapes that present a bottom and end walls. The system includes at least a first scaffolding structure having a gantry with at least two interconnected vertical poles; guides secured to the bottom of the volume to guide the poles in rectilinear displacement in a longitudinal direction; a horizontal main platform defining at least a working floor, and guides for guiding the main platform in vertical translation along the poles; at least two horizontal auxiliary platforms each defining a working floor mounted to move in horizontal translation relative to the main platform; and structure for displacing each auxiliary platform separately relative to the main platform between a retracted position and an extended position in which the outer edge of the auxiliary platform is substantially in register with the outer edge of the main platform.

Abstract: The invention relates to a scaffolding system for volumes of various shapes that present a bottom (20) and end walls. The system comprises at least a first scaffolding structure comprising a gantry having at least two interconnected vertical poles (56); means (50, 52) secured to said bottom of the volume to guide the poles in rectilinear displacement in a longitudinal direction; a horizontal main platform (60) defining at least a working floor, and means (64) for guiding said main platform in vertical translation along said poles; at least two horizontal auxiliary platforms (66) each defining a working floor mounted to move in horizontal translation relative to said main platform; and means for displacing each auxiliary platform (66, 68) separately relative to the main platform between a retracted position and an extended position in which the outer edge of the auxiliary platform is substantially in register with the outer edge of the main platform.

Abstract: A method of erecting the shell of an aboveground storage tank involves erection of the first shell ring; erecting the second and higher shell rings by using a mobile man lift to provide access for the construction personnel to the shell plates being erected; and anchoring the structure to reduce the risk of blow-ins from ambient wind.

Abstract: Each of a plurality of cargo holds of a bulk carrier vessel has a self-contained staging system lowered into it, from the platform track of which workers operate semi-automatic blasting machines that are mounted onto the platform. The set-up for each vessel also includes, for each hold, a ventilation unit provided on a hatch plug, and a transporter for the staging system. Groups of staging systems are served by on-deck air compressors. Staging systems actually engaging in blasting are served by recycling shot blast units which recycle and supply steel shot. Following blast cleaning, the cleaned surfaces are painted from the platforms.

Abstract: Each of a plurality of cargo holds of a bulk carrier vessel has a self-contained staging system lowered into it, from the platform track of which workers operate semi-automatic blasting machines that are mounted onto the platform. The set-up for each vessel also includes, for each hold, a ventilation unit provided on a hatch plug, and a transporter for the staging system. Groups of staging systems are served by on-deck air compressors. Staging systems actually engaging in blasting are served by recycling shot blast units which recycle and supply steel shot. Following blast cleaning, the cleaned surfaces are painted from the platforms.

Abstract: An adjustable working platform construction suitable for being used in distillation columns and the like. The working platform can be supported on rings present on the inner side of the column wall. The working platform is built up of a system of spokes which are connected to a central plate. Two diametrically opposed first spokes are fixedly connected to the plate and at least two pairs of second spokes positioned on either side of the first spokes are pivotably connected to the plate. Two third spokes, which are arranged in diametrically opposed relationship, are detachably accommodated in receiving holes in the central plate. The system of spokes supports cover plates, which are shaped to cover the entire column section.

Abstract: The invention consists of an active scaffolding system adapted to hold a payload, said active scaffolding system comprising: (a) a plurality of adjustable links and rigid links connected by joints; (b) a plurality of actuator devices associated with the adjustable links so as to change to length of the adjustable links; (c) a microprocessor to determine how the lengths of each of the adjustable links throughout a number of time steps; the microprocessor being provided with computer program instructions to resolve the Cartesian end point translational and rotational motions; and (d) the adjustable links, rigid links, and actuator devices forming an active scaffolding adapted to move a payload around environmental obstacles while supporting said payload against the force of gravity.

Abstract: A scaffolding particularly designed for work inside large hollow elements (1) such as tanks, quarries, etc. The scaffolding comprises a supporting structure consisting of two struts (3) interconnected by at least two crossbars (4, 5) for forming the flooring and stiffening the whole scaffolding, modular platforms (6) projecting at varying heights from the outer surface of said struts (3), and members (7) providing access to said platforms and arranged in or near said struts (3). Said scaffolding may be used to lay insulators in methane tanks.

Abstract: This invention relates to an expandable scaffold for use with hoppers and the like which can fold up to pass through a narrow or confined opening. The scaffold can be expanded in the interior of the hopper thereby providing the operator with a place to stand while working. The scaffold comprises attachment means for attaching the scaffold at a top end to a hoist or crane, an articulated frame including a plurality of bars joined together by pivot connection means, folding means connected to the attachment means at one end and to the articulated frame at an other end, scaffold flooring mounted on the articulated frame for supporting an individual, and a plurality of suspension means.

Abstract: The present invention features a telescoping-type scaffold for use in the repair of superheater tubes of power-generating boiler systems. The telescoping-type scaffold is constructed in situ at the superheater bay of the firebox of the boiler. The telescoping scaffold is fabricated in sections to provide bridges between: (a) the access hatch at the superheater level of the firebox and the first tier of a pendant section of the superheater bay, (b) the first and second tiers of the pendant section, (c) the pendant and the platen sections of the superheater bay, and (d) the first and second tiers of the platen section.

Abstract: A scaffold for locating workmen and materials inside a railroad car includes a pair of ladders hanging from the roof of the cars through apertures therein, and a plurality of planks disposed across the gap between the ladders and supported at their ends by the ladders.

Abstract: A moveable work platform assembly is provided which can be used, for example, within an enclosure having substantially nonvertical interior walls, the enclosure having a attachment means at substantially the upper end thereof. The moveable work platform assembly includes a main platform, suspension means for suspending the main platform from the attachment means, and at least one movable platform for extending outward relative to said main platform toward the interior wall of the enclosure and for retracting inward relative to said main platform and away from the interior wall of the enclosure.

Abstract: A safety and work platform is attachable to the top of a manhole casing during utility construction and provides for the safety of workers or persons upon the top of the casing. The platform provides for positive anchoring to the top of the casing with at least three securing points, at least one of which provides adjustability, and may include peripheral stanchions and guard rail for further protection. The interior of the casing is accessible through a an opening int he platform floor, which opening may be covered for safety when not in use. For additional safety, a belt and lanyard system may be used to secure a worker or other person to the platform. A method of use is also disclosed, with the platform first being installed upon a manhole casing and then the casing and platform lifted into position and installed together in order to preclude any persons from standing atop the casing before the platform is installed.

Abstract: A removable platform comprises a chute (14) having a handling and fastening assembly (18, 19, 14a) at one of its ends and a supporting part (14b) in the form of a portion of a cylinder open laterally and extending the tube (14a) substantially in its axial direction, a supporting shaft (16) mounted in articulated manner at the end of the chute, an assembly of supporting arms (15) mounted for pivoting movement about the axis (29) of the supporting shaft (16) and a plurality of plane elements (17) resting on the supporting arms (15) in the unfolded position, to form a work platform substantially over the entire cross-section of the casing (2). The removable platform is introduced into the casing (2) in the folded-up state; the arms (15) form an assembly (30) seated in the chute (14), and the axis (20') at the supporting shaft (16) is substantially perpendicular to the longitudinal direction of the chute (14).

Abstract: A load bearing scaffold adapted to disperse load forces to interior room surfaces. The load bearing scaffold includes a pair of generally parallel telescopically adjustable horizontal beams. The horizontal beams are supported on at least one end by at least one pair of generally parallel vertical beams. The vertical beams are interconnected in spaced apart relation by at least one cross bar. The scaffold is assembled so that the vertical beams and cross bar abut against one wall while the horizontal beams abut against the ceiling and opposite wall. Articles may be supported by being suspended from the vertical beams or horizontal beams of the scaffold.

Abstract: The invention also contemplates a retractable corner mechanism for the inside corner of the concrete form. The mechanism comprises an elongated corner member having first and second perpendicular faces joined along a first edge of each face to form a corner and having form attaching means along a second edge. A concrete form has an end attached to each of the second edges. Means are provided for sliding the forms relative to the corner member and means is provided for retracting and extending the forms to cause the corner member to be retracted and extended. The forms can be made of plywood or metal and the use of steel is contemplated for the corner members. The retracting and extending means can include an externally threaded rod pivotally connected adjacent the end of one of the concrete forms and an internally threaded member pivotally connected adjacent the end of the other of the concrete forms and treadably received on the rod.

Abstract: Automated installation for the laying for masonry on a wall, especially of a converter, comprising an operating station with a work plateform movable vertically inside the enclosure and capable of rotating about the vertical axis of the latter, areas for the simultaneous storage of two pallets of bricks on the platform, a robot for handling and laying the bricks, a monitoring and control station, retractable props for stabilizing the operating station and a device for raising and lowering pallets of bricks. The entire operating station is supported by a telescopic mast mounted on a turntable of a movable floor which is located outside the enclosure and with which the operating station forms a retractable self-propelled or towable unit.

Abstract: The present invention relates to a method of assembling an elevator within a building and the assembly jigs used therefor. According to this method, assembly jigs (1) including pre-positioned elevator elements such as rails, doors, counterweight and electrical conduit are positioned successively in a support shaft. These elements are secured without any other adjustment to the support shaft and the jig is then removed.

Abstract: A device for the maintenance of large-capacity containers such as storage tanks or the like vessels is described, which consists of a scaffolding structure for accommodating a plurality of working platforms along the container wall, such scaffolding structure reposing swingably around the vertical centerline which is the rotation axis. For this purpose, the device is movable along the total peripheral area of the upper container wall. In three preferred embodiments, the device may consist either of a centrally supported pivot mounting supported on the container roof, which is horizontally adjustable and vertically settable around an air dome, or of a load-carrying support which is placed centrally on the container roof, or finally of a load-carrying support reposing movably on a uppermost container edge and a tank catwalk, such load-carrying support being composed in turn of a lattice carrier and a frame.

Abstract: An apparatus for temporary installation within a relatively large pressure veseel, especially a boiler-furnace for generating electricity, for facilitating the manual inspection and (if necessary) the repair of things within said pressure vessel. The apparatus includes a generally horizontal platform upon which workers stand, and cables for raising and lowering the platform. The platform is fabricated from relatively small construction elements, each of which has a size that permits it to be inserted through a small access opening in the pressure vessel. The elements are manually assembled within the vessel by pinning them together, using high-strength pins which engage a plurality of prepared aperture. A relatively large platform is constructed in a vertical mode, and subsequenctly rotated to its horizontal and working orientation.

Abstract: An apparatus has been provided for vertically lifting or lowering a workman and/or materials at a construction site. This includes a rectangular platform having four corners for supporting the workman and/or material so that they can be vertically moved within an elevator shaft or the like. The platform has side edges positioned adjacent the side walls of the shaft. The platform can be raised or lowered by a crane. Recesses are provided in opposite side walls for receiving latches attached to the corners of the platform. The latches are locked in place when they are positioned within the recesses and can be retracted when the platform is to be raised and lowered. Also, leveling devices are provided at the corners of the platform for leveling the panels and devices are also provided for holding the panels in proper location prior to pouring the concrete.

Abstract: An arrangement for the demolition of smokestacks includes a demolition tool for successively demolishing the smokestack shaft. A work platform is suspended from the smokestack wall by suspension devices distributed over the circumference of the work platform. Each suspension device includes at least one vertically guided lowering piston which can be locked in different vertical positions. A suspension arm is mounted at the upper end of each piston and can be swung inwardly and outwardly. In the outwardly swung position, the suspension arm engages over the smokestack wall. A mechanical shovel with the demolition tool works on the work platform. The demolition is carried out in the area of a suspension arm which is swung inwardly. After the demolition work has been carried out, the suspension arm is again moved to the outwardly swung position. This is repeated with all suspension arms until the work platform can be lowered by the stroke of the lowering piston and a new demolition cycle can begin.

Abstract: A portable ladder assembly comprises a base, a supporting bracket, and a single rail ladder. The ladder assembly is particularly well suited for safely allowing human entry into a chamber with a confined area entry, such as a conventional manhole. The base member includes arms positionable on each side of the manhole entry for engaging a support surface, such as the ground, to prevent tipping of the ladder assembly. The bracket includes a rail receiving slot and a plurality of vertically spaced and downwardly directed rung receiving slots on opposing sides of the rail receiving slot. The ladder may be safely supported at various selected depths within the manhole by fitting the rail in selected rungs within their corresponding slots. The ladder assembly of the present invention does not significantly reduce the entry opening into the chamber, and may be safely used without being structurally dependent upon the manhole.

Abstract: Apparatus for cleaning accumulated spent alumina, dross, aluminum pads, refractories and carbon rods from an aluminum cell including a first platform supported on outrigger members for spanning the open top of the aluminum cell. The ends of the outrigger members carry edge clamping and traveler devices thereon which are alternately activated by hydraulic cylinders. In a locked position, the outrigger arms resist lateral and upward forces imposed by the digging and cleaning tools of the apparatus. In an unlocked position, the traveler devices support the outrigger members on an adjacent surface for movement along the cell. A turntable carrying a second platform is rotatably mounted on the first platform to permit 360.degree. rotation of the second platform. A mounting head is pivotally mounted on the second platform and carries an elongated extensible boom for controlled 360.degree. rotation about the longitudinal axis of the boom.

Abstract: In an adjustable corner post for suspension scaffolding an outer tube is concentric to an elongated member such as a wire rope or rod and has an internal thread in a nut at one end. A tubular adjusting screw having an external thread is concentric to the elongated member and screws into the thread of the outer tube for reacting directly or indirectly with the elongated member so the outer tube rises and lowers when the screw is rotated in opposite directions. A platform supporting structure is supported on the adjustable posts and is leveled by selective rotation of the screws. A method of assembling suspension scaffolding using the adjustable posts is described.

Abstract: An apparatus comprising a work platform movable inside a vessel and associated with a handling robot for handling and laying bricks is presented. The present invention includes at least two hoists placed next to one another, each hoist comprising several telescopic sections. Carriages move along the hoists in order to raise the bricks individually from a depalletizing station located at the foot of the hoist up to platform level. A depalletizing robot, the action of which is coordinated with that of the handling robot, transfers the bricks from a reserve of several brick pallets onto the carriages of the hoist.

Abstract: A unique lift container for use in erecting scaffolding within power boilers and similar large enclosures having small access manholes, preferably being made from modularized forming equipment so as to be readily disassembled into constituent parts dimensioned to fit through the small access openings of such boilers.

Abstract: Assembly equipment for rocket stages or other large structures includes three towers arranged on a circle and being circumscribed by a plurality of platforms; another platform ring is held in different levels on an inside circle, and a spiral structure is coaxially mounted for rotation on a circular track to permit access to every part of the centrally positioned structure to be assembled. An arch shaped bridge may span the top part; multiple equipment may be axially superimposed.

Abstract: Self-propelled scaffold for buildings (1) exhibiting a continuously closed contour, wherein the scaffold comprises a framework and a working platform arranged on a horizontal bracket (2) of the framework; as well as a rope tensioner (15) for the scaffold with two clamping units (101, 102) that can be moved with respect to each other and are opened and closed in phase opposition. The scaffolding is associated with at least two sets of jaws (7), respectively connected, with a mutually independent, detachable connection, to an outside face (4) of the building (1), one jaw set (7) being fixedly attached to the scaffolding and the further jaw sets (7) being connected, respectively by a length-variable element, with the first jaw set (7) or with one another.

Abstract: A scaffolding support assembly particularly useful as a base for modularized post-and-runner type scaffolding used on the interior of boilers or similar large interior spaces having sloping bottom walls when employed for inspection, repair, maintenance, etc. Such scaffolding support assembly preferably comprising a scaffolding post swivel base having pivotably attached thereto longitudinally adjustable stabilizing diagonals having a connector assembly at the free end of said diagonal for securing to a connector, preferably lower, on an adjacent scaffolding post. The resulting scaffolding system has unique versatility and ease in rapidity of assembly because the swivel bases rest on the sloping sides without attachment thereto, being stabilized in position by the adjustable diagonals.

Abstract: A panel (6) has a flap (9) for closing a person-passing opening (4') (e.g. leading into a ladder cage (4)) and is pivotally mounted to one of the risers of the ladder (1). A locking element (10) having a padlock-receiving hole (12) is pivotally mounted on the other riser (2) and is connected by a first link (14) to an intermediate lever (16) having a finger (23) for holding the panel (6) in its closed position, said intermediate lever being operable from inside the cage (24) by means of an operating lever (21).

Abstract: An arrangement for transporting wall material, for example, shaped bricks for the lining of ladles, converters, blast furnaces or the like, where the transport is intended to take place between a supply place, usually located outside the converter or corresponding apparatus, and a consumption place, for example a bricklaying station adjacent an inner wall in the converter or corresponding apparatus, which arrangement comprises a vertically adjustable carrying device and a conveying device for substantially vertical transport of material transferred to the conveying device, and transfer mechanism is provided for advancing material transported down by the conveyor onward to the consumption space, and a work platform is provided to be carried by the carrying device. The arrangement as disclosed shows the conveying device as a substantially helical slither plate, e.g., a chute or corresponding slide device, along which material supplied at an upper portion of the helical plate is intended to slide.

Abstract: A scaffold to which form plates for forming a concrete wall can be fastened is suitable for circular constructions and includes a polygonal frame which is vertically adjustable along supports. The frame, is angularly adjustable at the corners, of plural straight frame portions, each of which is a separate part attached to the adjacent frame portions.

Abstract: A founding ladder system provides support for a scaffolding system mounted inside an enclosed area, such as a boiler. The founding ladder system is modular in construction to allow for easy use and is both adjustable and adaptable to fit the various sizes and shapes of boilers in which it may be used. The founding ladder system includes a truss which is to be mounted horizontally and which is to be connected to ladder-like supports which extend up the inside walls of the boiler. The ladder-like supports provide points of contact for the scaffolding system to be constructed inside the boiler.

Abstract: A maintenance platform for reaching the upper area of the furnace (10) of a steam generator that can be quickly and easily assembled during a maintenance shutdown. The grid or frame of the platform is made up of a plurality of beams (22) extending into the furnace from opposite furnace walls (19). Cables (50) from the roof (60) support one end of the beams. Planking (66, 68) that interlocks (62, 64, 70) with the beams (22) completes the platform.

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).

Abstract: A prefabricated vehicle maintenance apparatus is disclosed, including a housing having bottom, side and end walls, which housing is adapted for insertion within a pit formed in the ground. A horizontal platform is arranged in the housing for supporting a mechanic beneath a vehicle arranged in straddling relation above the pit, the platform normally having effective width and length dimensions corresponding generally with the spacing distances between the housing side and end walls, respectively. The vehicle maintenance apparatus further includes a platform lifting device for vertically displacing the horizontal platform between upper and lower levels relative to the housing bottom wall, at least one of the effective width and length dimensions of the horizontal platform being variable to define an opening affording access to the portion of the housing bottom wall arranged beneath the platform.

Abstract: A novel safety platform for use in a vertical shaft such as a manhole. The platform comprises a pair of support beams with the ends of each support beam mounted in the wall of the shaft. At least one panel extends across the shaft and bridges the support beams with a novel wedge clip at one end of the panel to allow the panel to be opened or secured in the closed position. A novel pivotting means is provided at the other end of the panel which pivotally secures the panel to the opposite support beam. The platform may be installed easily with fewer problems than the prior art yet provides increased safety factors for the user.

Abstract: A process of erecting interior combustion and checker chambers in a hot blast stove by lining the checker chamber and building the chamber wall from a vertically movable scaffold in the checker chamber shaped to conform with the interior thereof, laying up checkerwork in the checker chamber beneath the movable scaffold, these two operations being supplied from outside the stove through feed openings at progressive heights, and lining the combustion chamber from a vertically movable work scaffold within the combustion chamber. All three principle operations are carried on concurrently.

Abstract: A maintenance platform for a boiler-furnace that permits safe and ready access to its normally inaccessible upper parts and integral superheater. The maintenance platform is installed in the furnace, below the superheater on a horizontally movable support whereby said support may be selectively moved across said furnace or stored laterally adjacent thereto.

Abstract: A collapsible scaffold for overhead protection of workmen in cement kilns. The scaffold includes a plurality of scaffold units each of which is constructed for erection from a collapsed condition into an overhead protective position. The units are attached in series, one in front of the other, to provide protection along a designated length of work area.

Abstract: Described is a movable work station apparatus including travelling-hoist supported tools and a vertically and rotarywise movable frame-carried radiation-shielded enclosure, or gondola, for working personnel involved in tube-bundle-replacement tasks performed within the shell of a steam generator in a nuclear plant. The enclosure, or gondola, is divided and accommodates four upright workers in mutually-facing pairs at opposite sides of a work-accommodating clearanceway observable and accessible from the gondola interior via lead glass windows and hand holes.

Abstract: The present invention refers in general to dismountable structures, and more particularly involves a dismountable structure for inside maintenance in spherical tanks, providing two rotatable towers, one atop the other, with anti-friction bearings for rotation up to 360.degree., supported at top and bottom by rotary elements, and having at mid-section hinged arms carrying baskets and auxiliary arms and a rotary device for movement upward and downward for vertical work for the basket-supporting arms; it comprises in addition operating baskets having capacity to carry operators and inspection and maintenance equipment with illumination; the structure also affords safety winches with rack levers for raising and crank for descending, as well as auxiliary cable arms to provide a suitable angle of loading.

Abstract: Scaffolding, for working in an area having relatively close spaced sidewalls, comprising generally T-shaped stackable members wherein the top of the T is adjustable outward to contact the sidewalls and limit sideway scaffolding movement. The T-shaped members can be stacked vertically, one atop the other, to provide different heights. A work platform, or staging, extends between the top of the uppermost T-shaped section and the top of a similar height spaced apart T-shaped section. Horizontal supports or stabilizers extend between the vertical columns which are built up from the T-shaped sections. The T-shaped sections are formed from metal tubing with adjustable portions, such as a threaded member, being connected at the ends of the top tubular member. When the scaffolding is erected, these adjustable members are adjusted out to engage the walls between which the scaffolding is utilized.

Abstract: A movable work support particularly adapted for use within a silo or similar cylindrical structure is disclosed herein. The work support comprises a frame supporting a work platform and a winch mechanism. A cable extends from the winch to a point of securement at the top of the cylindrical structure, and extension or retraction of the cable from the winch mechanism will cause the framework to lower or raise, respectively. A first pair of wheels is located at an end of the frame opposite the location of the work platform. The first pair of wheels is positioned to engage the side wall of the structure and to roll along the side wall as the frame is moved vertically. A second pair of wheels is mounted near the first pair of wheels on the frame and is oriented to roll along the side wall as the frame is rotated in a horizontal plane within the structure.

Abstract: This invention provides a platform structure having a retractable floor portion consisting of four main floor panels extending outwardly in directions defining a cross, and pivotable between a horizontal and vertical position. There are also provided secondary floor panels for the quadrants between the main floor panels, the second floor panels being mounted to another main or secondary panel along aligned edges. The secondary floor panels can pivot through 90.degree. or 180.degree., to permit all panels to be folded into an upright position, to lie along a central framework portion.

Abstract: This invention is staging or scaffolding for use within a tank for example a storage tank in chemical plant or in a marine oil tanker, and an assembly of staging comprises a number of platforms each coupled to at least three flexible chains adapted for connection at top and bottom to a side wall or the roof or floor of the tank with the chains extending vertically between the top and bottom fixing points and the platforms extending horizontally and spaced vertically from one another. The assembly can be collapsed and lowered through a hatch in the roof of the tank or can be built up within the tank and the connection at the top may be to a releaseable shackle which remains engaged so long as the chains are supporting substantial weight, but which automatically release when weight is removed so that removal of the staging after it is no longer required can be done quite safely without an operator standing on the staging.

Abstract: The masonary or refractory material employed in the lining of blast furnaces has to be demolished, torn out, reconditioned, or replaced periodically, due to wear and deterioration of such material and the subject invention involves improved equipment or apparatus with respect to removing or delining this material.