Abstract: A scaffolding system useable on either a flat or pitched gable roof a roof and including a mast, rollers which connect the mast to the roof, and a winch for adjusting the position of the scaffolding system relative to the roof.

Abstract: A collapsible and adjustable mechanic's platform which is suspended from a vehicle tire and supported on a pair of rails by chains which extend from the tops of the rails to brackets which support the platform. The rails are pivotally supported at their upper ends on short horizontal bars which are rigidly connected to a pair of vertical tire bars which, in use, are pressed against the outer wall of a vehicle tire by a combination of interconnected bars which extend over the top of the tire and down the inner wall of the tire. The interconnecting plates include a locking plate which is forced against the inner wall of the tire by a horizontal bar which extends across the top of the tire and through a circular opening in the locking plate.

Abstract: An evacuation system for nonambulatory patients from a multistory hospital or the like. A trackway is secureable to a wall of a stairwell and includes a hanger rail support. A hanger is rotatably associable with the hanger rail support and has elongated elements suspended from same for securement to a wheelchair, stretcher, or the like. A brake system is associated with the hanger to normally brake rollers, wheels, or the like of same against movement. A brake release apparatus is operatively associated with the brake system from the hanger for actuation by a patient or attendant to permit the hanger to carry the patient along the trackway.

Abstract: A manually portable, movable, bosun chair support apparatus comprising: a frame member with rollers mounted to the underside which rests on the top ledge of a building wall; an adjustable U-shaped member with arms extending downwardly, one on the inside and the other on the outside of the building wall; a first and second adjustable roller means operatively attached to each of said downwardly extending arms such as to make contact and roll along the inside and the outside of the building wall, respectively; and a hook means attached to the lower end of the outside arm for tieing a rope thereto. Such an apparatus is useful for suspending a workman seated in a bosun chair tied to the apparatus without making permanent or damaging contact with the roof of the building, yet affording the workman ease of movement along the exterior wall of the building as well as affording essentially instantaneous manual installation, removal and repositioning.

Abstract: Drop scaffolding is formed by assemblies of drop tubes 12 and scaffold tubes 15 extending transversely between the drop tubes. Each drop tube has a top coupling secured to an upper part thereof and a bottom coupling secured to a lower part thereof, the two couplings being similar and having cradles with openings directed respectively generally downwardly and generally upwardly. Each coupling comprises an elongate body having a hollow section with a longitudinal axis extending the length of the body, in which section a drop tube is secured. A hook-like cradle 14b, 14c, 14d projects from the body away from the hollow section with an opening x between retaining walls 14c, 14d, each making an acute angle with the longitudinal axis of the section in the quadrant that includes the first end of the body.

Abstract: A portable motor outrigger for suspending scaffolding in which there are a pair of spaced generally parallel, substantially A-frame-shaped supports (30, 32), having a beam (26) extending therebetween. Each A-frame has two plates (100, 108), one adjacent the lower end of one leg (76) and the other adjacent the lower end of the other leg (78). The plates are adapted to be positioned on a surface (12) to support the beam (26) through the A-frame supports. A wheel (104) is mounted for rotation in a lower part of the A-frame and is positioned to be substantially in vertical alignment with the center of gravity of the weight on the support. A caster (98) depends from an end (86) of each A-frame, the wheel and caster being above a roof surface when the plates (100, 108) support the A-frames on the roof surface. A jackscrew (92) is mounted on one end of each A-frame adjacent the caster and is adapted to raise and lower plate (100) adjacent the caster with respect to the A-frame and the caster.

Abstract: A vehicle and method for raising elongated objects, especially for raising pipes and the like to a ceiling structure in the construction of a building. The vehicle has a pair of transversely extending support stands and a lift such as a scissors lift adjacent each. On top of each lift is a saddle for supporting an object to be raised and a transversely extendable rod with a hook end. A platform may be removably attached to each lift. In the method of operation of the invention to lift an elongated pipe, the rod and the lifts are utilized to engage a pipe in a stockpile and lift the same onto the support stands. Thereafter the lifts are lowered, the elongated pipe is rolled to be over the saddles of the lifts, and the lifts are raised to raise the pipe up to its desired position in the ceiling structure.

Abstract: A portable cage and system for servicing high voltage power transmission lines, including a uniquely shaped cage lowerable onto a power line bundle of one or more conductors, the cage placeable by an ungrounded helicopter or a ground-based crane from a position above the power transmission lines lowered thereonto. Workmen may then safely move about within each basket to complete the required power line repair. The cage includes a horizontal crossframe and two baskets each connected to and downwardly hung from the crossframe, the entire cage having a unique, generally inverted "U"-shape when viewed from either end of the cage. The cage may include adjustable connector engagement wheels which contact each power line in the bundle for support and lateral movement of the cage. These wheels are connected to the crossframe such that the two basket portions of the cage hang on either side of the power line bundle, again aided by the generally inverted "U"cross-sectional shape.

Abstract: A hook device for hanging outside of a building window opening for supporting one end of a scaffold plank, the device being shaped with a hook at one end and a loop at its other end and also including a steadying cross brace fitted with bolts to abut the building wall face.

Abstract: A telescoping wall scaffold has a suspension member with a first end and a second end and shaped therebetween to extend about the overhang of a structure having a vertical surface. A leg and foot arrangement is attached to the first end for contact with the structure. A base member is attached to the second end to extend downwardly therefrom along the surface of the structure. At least one telescoping member is mechanically and telescopically adapted to the base member for telescopic movement and relation thereto. A platform support is attached to the telescoping member to support one or more platforms. A spacer member is also adapted to the telescoping member to extend away therefrom toward the surface of the structure. A wheel or roller is adapted to the spacer member for rolling contact with the surface. A winch with a reel having a rope wound thereon is also secured to the telescoping member.

Abstract: The boom of a crane carries a pivot bearing for a second bearing which guides an elongated column. The upper or the lower end of the column supports a gallery which is turnable about its axis. The second bearing is pivotable about the horizontal axis of the pivot bearing by a cylinder-piston unit and the column is movable lengthwise with respect to the second bearing by means of the crane cable.

Abstract: A cable hanger bracket is provided for hanging a swinging scaffold from a walkway grating comprising vertical parallel side walls, a connected bottom wall and U-type oppositely extending bends for overlapping the grating of a steel grating walkway. A softener member device is secured between the parallel side walls and the connecting bottom wall and is designed to prevent cutting or chafing of a loop of cable about the softener member and between the parallel side walls. The cable hanger has U-bends and downwardly extending walls which overlap the grating and bind thereto in the event of overloading of a platform supported by cables and the hanger bracket.

Abstract: Emergency apparatus in the form of a rescue box for air-lifting survivors from burning high-rise buildings; the rescue box has opposed full-width and full-height doors hinged at the bottom, which act as passenger loading ramps when open as when the rescue box is set down on the roof of a burning building and which on lifting by helicopters is safely held closed by lifting lines proportioned for sharing the load with other lines to the rescue box; each door has a smaller door in it hinged inward at the bottom to facilitate escape into the rescue box when positioned alongside burning buildings, as through windows in the buildings; aerodynamic stabilization for steadying the rescue box during transport and landing is provided by a tail extending from an end of the rescue box; special view limiting and cushioning features are also disclosed.

Abstract: A suspension system for a person under a ceiling is disclosed, consisting of a false ceiling composed of a plurality of spaced-apart tiles each of a regular geometric shape. Slots are thus defined between the tiles. The latter is also downwardly spaced from the regular roof or ceiling and is rigidly secured thereto, thereby defining a space between the tiles and the roof. At least one pair of stilts is used in combination with the ceiling. Each stilt is adapted to move in the slots and is provided with a suspension flange at its upper end and a foot support at its lower end, thereby enabling a user to "walk" under the ceiling.

Abstract: A window bracket is constructed to be supported on a window sill and the walls beneath the sill of an open window and further constructed to hold a safety scaffold to permit work on the exterior of the building, either on the windows or the area between windows. It may be used in pairs to hold a scaffold or in greater numbers where the scaffold is longer and extends over a greater area of the building exterior. It is rigidly constructed by welding of steel or aluminum alloy for rapid installation through open windows and is equipped with safety railings and reinforcing brackets to insure complete safety of workmen working on the outside of the building, such as repairing the exterior wall, painting or washing or repairing the windows from the exterior of the building.

Abstract: A hanging chair with seat (1) and backrest (2) is provided for its suspension with lifting slings (23,24) a top eye and crotch straps (25,26) at the seat (1). The slings and crotch straps are formed from a single hose of the type which dilates radially for axial compression and increases its inner diameter from a nominal value in an unloaded state and contracts the diameter for an axial pulling load. A portion of the hose forming the sling (24) is taken through a hole (10) in the seat (1) under the seat and up through a hole (9) therein to form the sling (23) and lifting eye, internally along the sling (23), out from it to the backrest (2), and after passing along the back of the latter, to the sling (24), up through an opening (21) in the latter and out. Another portion of the hose forms one crotch strap (25), and is taken under the seat and out to form the other crotch strap (26 ), continues inside the sling (23) up to and out through an opening (19) therein.

Abstract: A basket structure for supporting linemen performing maintenance work on tower supported lines and method of performing same is disclosed. The basket is embodied within an enclosure having corner members in attachment to sling lines of a helicopter. An inclined appendage on each corner post engages a segment of the tower supported line during elevation of the enclosure by the helicopter to temporarily secure the enclosure in place on the line to permit maintenance task performance. The inclined appendages include a resilient covering to enhance line or static wire engagement. Lugs at the corner post upper ends attach the sling lines in an offset manner to permit unobstructed vertical movement of the enclosure past the line preliminary to upward seating of a pair of appendages against the line.

Abstract: A magnetic holder for pulling in and securing a platform and personnel to e hull of a ship to be serviced is disclosed. A lightweight corrosion resistant body member houses a permanent magnet and has an extension for receiving an elongated tool with which the holder is brought in contact with the ship's hull. A flexible resilient line attaches the platform to the holder and allows the platform to be pulled to the hull. Easy removal of the holder is accomplished by applying an external force to the extension creating a turning moment to overcome the magnetic holding force.

Abstract: The free end portion of the boom of a crane carries a separable pivot bearing defining a horizontal pivot axis for a second bearing which reciprocably guides an upright column for one or more galleries. When the cable which is used to lift or hold the column breaks and the column begins to rapidly descend, such movement of the column activates a composite brake mounted on a frame surrounding the column at a level above the second bearing. The brake holds the column against downward movement with reference to the frame whereby the frame tends to descend toward the second bearing against the opposition of several shock absorbers which reduce the likelihood of damage to and/or excessive swaying of the boom and/or injury to the occupant or occupants of the gallery. The speed of downward movement of the column is monitored by a detector which activates the brake as soon as the speed exceeds a preselected value.

Abstract: A chain supported scaffolding arrangement for use inside of a building or vessel or in working under a bridge. Chain gripping plates engage the chain and support hollow tubular vertical posts which have a plurality of receptacles connected thereto. The chain engaging plates have a recess formed therein for receiving and positioning the vertical posts. Horizontal members engage the receptacles and extend between the vertical posts which are supported from the chains. The horizontal members are connected to the vertical posts by connectors which prevent movement about their connection axes so that when the various horizontal and vertical members are interconnected, a relatively stiff structure, which is chain supported, is provided.

Abstract: A shelving system for supporting horizontally disposed shelving adjacent a vertical wall surface having associated horizontally extending sill or the like at the upper extremity of the wall. The system includes vertically extending rail members having supporting and positioning means which are capable of puncturing or piercing the sill to achieve the supporting and positioning of the rail members.

Abstract: An anchoring device for use with a flexible ladder. The ladder is provided with an upper end having connecting elements. The anchoring device is arranged to connect the upper end of the ladder to an upstanding annular access manhole projection, such as provided on a storage spheroid. The anchoring device includes an arcuate caster support having opposite end portions to which are connected the opposite ends of a flexible connector to which the connecting elements of the ladder are movably connected. The caster support is provided with a plurality of casters rotatably mounted to roll about the manhole projection so that the flexible ladder may be hung from the projection for ready adjustability on the spheroid about the vertical axis thereof.

Abstract: A scaffold has features that allow it to be supported vertically by connecting it to a building. The scaffold includes a pair of legs. Each leg will telescope to vary the length of the leg. A rail interconnects the legs. A worker's platform is carried by the rail below the rail. Rollers connected with the platform allow the platform to roll along the length of the rail. An adapter mounted to the top of each leg will insert under a depending member of the building roof to hold the legs vertically. The adapter is urged upward by a spring to maintain engagement.

Abstract: A scaffold having a number of platform plates connected through independent chains. Independent chains are also provided above the uppermost platform and below the lowermost platform for connection to upper fitting members and lower fitting members, respectively integral with a wall. The latter chains are provided with tensioning means enabling the scaffold to be firmly and rigidly secured to the wall. The platforms are also adjustable horizontally.

Abstract: A portable chair lift for use by a hunter and the like for raising the person off the ground by means of a line extending over a limb. The device includes a frame member which has a seat hung downwardly therefrom on ropes. A worm gear assembly is carried by the frame member to which a hand operated crank is connected for rotating the worm. A pulley is carried on the same shaft as a gear forming part of the worm gear assembly and has a coiled length of web material provided therefrom. The rope is tied to the end of the web material. As a result of the worm gear, the chair lift can be raised with very little effort and the web material aids in stabilizing the chair. The entire chair is collapsible into a compact package for transporting from one site to another.

Abstract: A water-immersible seat for use at the edges of swimming pools, on the sides of boats, and over the rims of hydrotherapy equipment is disclosed wherein the amount of immersion of an occupant of the seat can be varied.

Abstract: A scaffolding apparatus has features that are easy to carry and easy to assemble. The scaffolding apparatus includes a pair of legs that are connected together by a horizontal rail. Standoff means supports the scaffold against the building, with the legs inclining toward the building and the rails spaced away from the building. A worker's platform is carried by the rail below the rail and for movement along the rail.

Abstract: One or more elongated base members are arranged to lie on the top surface of a building with their outer end portions projecting beyond the side of the building. These base members have a depending arm connected to the outer end portion thereof, and a scaffold for workmen is arranged to be suspended from such arms by suitable suspension lines or the like. The connection between the arms and their base members is adjustable on a horizontal axis so that the arms can be positioned at selected angles, including an acute angle, relative to the base member and arranged to extend under an overhang on the building if necessary. Workmen can thus be supported close to the side of the building even though the latter has an overhang.

Abstract: In the preferred and illustrated embodiment, a scaffold is shown for attachment on the bottom side of an offshore drilling rig or platform. The scaffold is quickly installed and removed. It is fabricated with a set of upright hanger straps which, in turn, clamp to eye beams spanning the bottom side of the offshore structure. The hanger straps incorporate opposing hooks at the upper end. The central portion is comprised of an elongate strap or hanger, the length accommodating workmen. Each strap terminates at its lower end with a support to receive framing members such as horizontally deployed structural beams. The beams support deck planking arranged horizontally thereon and spaced from the bottom side of the offshore structure.

Abstract: An improvement in portable scaffold assemblies which enables a scaffold to be securely hung upon a vertical portion of the building, without the need for permanent anchoring means, either on the building or on the scaffolding frame itself. The portable scaffold assembly is preferably constructed of square tubing, with a main pair of open-ended vertically extending tubular members comprising the main structural member for a permanent walkway, and also for hanging an auxillary walkway, therebelow. The scaffold may be positioned, in a vertical sense, very close to the top of the vertical building portion which supports the assembly, or telescoped downwardly therefrom to any desired extent. This is allowed by a pair of L-shaped upper arms which telescopically engage both the main scaffold holder assembly, and also the removable L-shaped anchors, which are movably fitted against the vertical supports of the building structure.

Abstract: A portable support for a scaffold comprising first and second wheeled support members which are adapted to be placed on the building roof. The support members are interconnected by length adjustable braces to enable the distance between the support members to be varied. Handrails are also provided on the wheeled support members which extend therebetween to enable the entire assembly to be easily moved as a unit. The first support member has a plurality of upstanding posts secured thereto for selectively vertically receiving one end of an elongated scaffold support arm. The second support member has a pair of posts secured thereto and extending upwardly therefrom for receiving the scaffold support arm therebetween. The scaffold support arm is also length adjustable to enable the distance between the support members to be varied.

Abstract: A suspended cradle for use in the inspection and maintenance of difficulty accessible structures comprises a frame provided with a series of at least three roller assemblies each having rollers for running on an overhead track on the structure to be inspected or maintained and thereby suspending the frame for movement along the track. Each roller assembly has means for rendering the roller assembly inoperative by relieving the load on the rollers and withdrawing the rollers from the track so that the inoperative roller assembly can move past an obstruction on the track while the frame remains movably supported on the track by the remaining roller assemblies.

Abstract: A movable roof-supported scaffold support which comprises front and rear vertical frame members which are detachably connected by a plurality of spaced-apart connectors. At least three spaced-apart pairs of wheels are mounted on the support. One wheel of each pair is adjacent to the front frame member; the other wheel being remote therefrom. A scaffold connector assembly is secured to the front vertical frame member.

Abstract: A scaffolding frame member to be used for supporting scaffolding planks along the side of a building structure and adjacent the roof thereof. Each member is basically comprised of four folding parts, a roof member, an upright channel, a turnbuckle connected between the roof member and channel, and a bottom brace member. All four members fold together to form a compact unit for easy storage and transport. The frame member is mounted to a structure by first securing the roof member to the roof structure or frame with the channel and bottom brace hanging over the structure side. The turnbuckle mechanism can then be tightened between the roof member and suspended channel member to pull the channel member inwardly and press the bottom brace firmly against the structure wall. The bottom brace may then be secured to the wall.

Abstract: A chain of end support sections are foldably linked together and hang vertically from either side of a horizontal support beam. The beam is attached to a pair of suspension cables through two motorized grip hoists rigidly attached to the beam and the cables then hang downwardly along the chains of end support sections to the ground. Work platforms extend horizontally between the end support sections and can move vertically independently of the end support sections. Means are provided for selectively attaching the ends of any work platform to the cables or the end support sections thereby enabling the independent movement of the end support sections and the work platforms during erection and disassembly of the scaffold system.

Abstract: The invention concerns a scaffolding system for use at the erection of high buildings and solves the problem of providing a suspended scaffold which is stepwise lifted to higher levels but yet in constant communication with ground level. The patented system comprises two scaffold categories the one (1) being permanently directly accessible from ground and the other (2, 3) being successively lifted to higher levels and, between the lifting operations, held suspended from the building itself rather than from lifting cranes.

Abstract: A mobile siding scaffold system which comprises a roof vehicle and a scaffold. The roof vehicle is mounted on castors. Attached to the vehicle frame and extending over the front of the frame are two telescoping booms. These booms are provided with cables and suspension beam connection points, and enable the scaffolding to be carried along the sides and around the outside corners of buildings without the need to disassemble the scaffold. Adjustable outriggers are mounted on the frame so as to be able to extend in front of the frame for stability to prevent the weight of the scaffolding from upending the frame. For further stability, telescoping arms provided with counterweights may be mounted on the frame, so as to extend out to the rear of the frame. The scaffold includes the following: A horizontal platform suspension beam, which may be fastened to the cables and fastened to the support beam connection points, has holes aligned with the cables to allow the cable to pass through.

Abstract: A roller fitting adapted to be secured to a length of scaffold tube and to suspend said scaffold tube from a girder, said fitting comprising a main body, a clamp pivotally mounted on the main body, means for releasably holding the clamp to the main body, and a roller rotatably mounted on part of the main body by means of a bearing. The clamp and main body are so shaped that they can receive and hold between them a length of scaffold tube and the arrangement is such that, when the fitting is located in position with the roller bearing on a flange of a girder, the said part of the main body on which the roller is mounted is located over the flange of the girder whereby, in the event of failure or breaking up of the roller or bearing, the said part can engage the flange of the girder.

Abstract: The invention provides a method for furbishing or renovating large span overhead structures, for example the roofs of railway stations, or bridges and the like, and utilizes apparatus which comprises a plurality of runway beams suspended in spaced parallel disposition from the main ribs or framework of an overhead structure said beams spanning a plurality of said ribs or framework and being longitudinally displaceable relative thereto, and a work platform or platforms suspended from said runway beams and being displaceable therealong. Thus arranged, the overhead structure can be treated for substantially its entire length by alternately advancing the work platforms along the runway beams and the runway beams relative to the structure.

Abstract: A rescue vehicle or safety apparatus is disclosed which in its most basic form includes a self-propelled platform adapted to be suspended from a vertically directed line in turn connected to a movable or stationary point thereabove. So attached, the platform may be accurately maneuvered under its own power from a position somewhat laterally removed from the locus of an emergency such as a fire in a tall building or the like, to a position immediately adjacent the window or other opening in the building such that persons trapped therein may be moved directly into the rescue vehicle and accordingly be removed to safety. The vehicle may also be used for fire fighting and combating other emergency situations such as grain elevator explosions, oil tanker and other fires at sea, etc. and would normally be transported and directed in its use position by means of a helicopter, although not limited thereto.

Abstract: A scaffold stabilizer for use on a scaffold platform, consisting of a multiplicity of longitudinal planks of uniform thickness assembled in side-by-side contact to form a supporting floor or platform for workers. The stabilizer comprises a generally C-shaped unitary metallic clamping member comprising upper and lower plate members rigidly connected to an end plate member, the upper and lower plate members being sufficiently long and defining therebetween an opening sufficiently wide and long to receive a multiplicity of flooring planks in close side-by-side engagement. At least one of the plate members is bowed towards the other so as to provide a tight frictional engagement with one surface of the planks present therein. The upper and lower plate members are provided with means for securing and tightening the ends thereof together at a location adjacent the outermost plank contained within the clamping member.

Abstract: An orchard lift apparatus including a bicycle-type seat upon which an orchard worker may sit, said seat mounted on an elongated pole passing upward through a sleeve and friction hemisphere, said hemisphere resting within a socketed bridge through which said sleeve passes downward, a cable, attached to said sleeve-hemisphere unit, extends downward, approximately parallel to said pole, and is wound or unwound by the worker, on a drum at the base of said pole, by means of foot pedals. Whereby, the worker may move upward or downward, and may change the attitude of the seat in any direction, two straight poles or tubes constitute the legs, angling inward in an upward direction, the above mentioned socketed bridge rigidly fastened to, and spanning across the tops of said pole legs.

Abstract: A brake unit for a skip or carriage adapted to ride on one or more cables. The brake unit has brake jaws spanning the cable, said unit being connected to the skip so as to move along the cable therewith. The connection to the skip is such that when the latter is moved in one direction, the jaws slide along the cables, but when the skip moves in the opposite direction, the jaws grip the cable in a braking action. The brake unit has adjusting means which is operable to adjust the gripping action of the jaw anywhere from a complete grip preventing movement of the skip to release of the cable so that the skip can move freely therealong.

Abstract: One or more elongated roller assemblies may be selectively mounted at a variety of positions along the inner edge of a scaffold platform. The inner and outer edges of the platform each include a series of correspondingly spaced apertures therethrough which receive the support rods or shafts of the roller assemblies. When the roller assemblies are emplaced the rollers lie between the inner edge of the platform and the vertical wall of the building along which the scaffolding is moving, and the mounting or support rods extend entirely through the platform and act as reinforcement of the assembly.

Abstract: A carriage has pulleys adjacent opposite ends thereof for riding on a pair of line cables which have obstructions thereon, such as hangers and spacers. The carriage has brakes associated therewith for engaging the line cables. These brakes are such that they permit the carriage to move in one direction but automatically grip the line cables when the carriage moves in the opposite direction. These brakes are releasable to allow the carriage to be moved in either direction. Lifting apparatus is provided for each end of the carriage in the form of hooks that can be placed on the line cables and lifter lines extending between the hooks and the carriage. The lifter cables are connected to a foot pedal in the carriage which can be manipulated to transfer the weight of the adjacent end of the carriage through the hooks to the line cables thereby allowing the pulleys at that end of the carriage to be lifted off the line cables and shifted around an obstruction thereon.

Abstract: A scaffolding device comprising a pair of units each having spaced vertical suspension members, a top rail member and a bottom cross member joined together, the top rail members extending forwardly of the adjacent vertical suspension members and telescopically receiving adjustable L-shaped arms for embracing a windowsill. Bumpers extend from the vertical suspension members nearest the building wall and engage the latter for lateral stability purposes. A platform is pivotally connected to the cross member of one unit and lies across the cross member of the other unit. The units are interconnected by a collapsible gate and a chain, and the chain also connects to the platform for assisting in the raising of the platform during removal of the device from a window opening.

Abstract: A portable support for a scaffold comprising first and second wheeled support members which are adapted to be placed on the building roof. The first support member has a pair of upstanding posts secured thereto for selectively vertically receiving one end of an elongated scaffold support arm. A plurality of weights are removably mounted on spaced-apart upstanding rods. The second support member has a pair of posts secured thereto and extending upwardly therefrom for receiving the scaffold support arm therebetween. The scaffold support arm is selectively vertically positioned between the upstanding posts on the second table by means of a bolt extending therethrough. The outer end of the scaffold support arm has the scaffold operatively secured thereto.

Abstract: A work platform for use in the servicing of jet engines including a frame, curved to conform with the exterior of the engine, carrying at its lower end a personnel supporting platform, a plurality of latch members rigidly attached to the upper end of the frame and adapted to engage cowling mountings on the engine thereby to support the work platform upon the engine, said latch members being adapted for insertion within the cowling mountings when said work platform is pivoted away from said engine about the end of the frame adjacent the latch members and for work platform supporting locking engagement with the cowling mountings upon pivotal movement of the work platform into an operational position on the engine following insertion of the latch members into the cowling mountings.

Abstract: This invention relates to an arrangement for projecting cantilever sections of multi-sectional bridge supporting structures of steel or prestressed concrete forming the superstructure of the bridge which is supported on bridge piles. The arrangement includes at least one traveling auxiliary beam movably carried on and arranged above the superstructure for spanning between superstructure sections. Two concreting scaffolds each comprising a supporting part having crossbeams and rollers are arranged above the superstructure and carry a platform which is arranged below the superstructure for carrying casings to extend the projecting superstructure sections. A transport device is movably carried on the auxiliary beam and supports the concreting scaffolds for transport between superstructure sections and from the end of a completed section to a bridge pile for beginning construction of a new section.

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.