Abstract: The device for climbing a pair of roses (1) includes upper and lower clasps (4,6) for clamping each rope and connecting elements for holding a climber. which include a movable or solid seat (7, 12) or harness (23). Each clasp (4,6) has a housing (21); a yoke (3) in the housing (21) provided with an interior space having beveled inclines widening downward; cotters (10) positioned on opposite sides of the rope (1) in the interior space; rollers (11) arranged movably, but securably, between the cotters (10) and the beveled inclines; a compression spring (20) bearing on an upper end of the yoke (3); and a resilient time servo-component (9) arranged at a lower end of the yoke. The resilient time servo-component (9) acts on the yoke so that the clasp (4,6), when relieved, automatically clamps the rope after a predetermined time interval, thus protecting the climber.

Abstract: A work platform (10) for performing work operations on an object such as roof construction work including an upper surface (15A) for working on the roof and a lower surface (15B) for storage of work material, the step between the work surfaces (15A, 15B) comprising an elongate material transfer section (19), and the upper work surface (15A) including a covered roof access section (11). The platform can also be used for access to perform maintenance work on aircraft, railway carriages, etc. The invention also provides method of performing work operations utilising the work platform (10).

Abstract: An apparatus for evacuating people from a high building in emergency includes a car member, a pivotal arm disposed on a top floor of a building, first and second motors disposed on the top floor and controllable with control units, and first, second and third steel ropes. The first rope is connected to the first motor at one end, and is passed over first and second pulleys fitted to the arm and joined to the car member at the other end. The second and the third ropes are connected to the second motor at first ends, respectively passed over third and fourth pulleys fitted to the arm, and passed through respective pairs of guiding rings of the car member and secured to the ground at second ends so that movement the car member is made stable and smooth by the second and the third ropes.

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: A rigid, unitary ladder is provided having one end which attaches to a powerline support tower after the ladder is dropped by helicopter to a lineman previously offloaded onto the tower. The ladder includes a first section which extends outwardly from the tower and a second section which extends angularly downward from the first section to a base which rests on the powerline. The first section is of a length sufficient to space the base a distance from the tower which is beyond the flashover area around the tower.

Abstract: A suspended scaffold may be hung from a skyscraper, a ship's side or other structures where work on a surface is done by the workers on the scaffold. The surveillance system is a frame removably hung on the rails of the scaffold. A TV camera and transmitter is mounted to the frame. A remote TV/receiver allows a person on the ground to view the condition of the building. Optional pan, tilt, zoom features and a tilt alarm are disclosed.

Abstract: A movable scaffolding for painting or otherwise servicing the sides of a cylindrical tank or like structure comprises a remote controlled, powered truck that is positioned adjacent a peripheral edge of the tank and directed for circular movement around the tank. A tether connects the truck to the tank and constrains the truck to movement in a circular path around the vertical axis of the tank. A vertically raisable platform is attached to an outer side of the truck for vertical movement along outer sides of the tank. In one aspect of the invention, the truck comprises a radially oriented beam, with at least one and preferably two longitudinally spaced wheels rotatably mounted on radially oriented axles.

Abstract: A cabled platform suspension system includes a platform having first and second support points at spaced locations along a front work-access edge of the platform and a third, stabilizing/rotator support point. A platform support structure, such as the two or four towers of a dry dock, defines first, second, third and fourth platform suspension points arranged in a substantially rectangular pattern. Six cables are connected between the platform and support structure, with five cables being respectively connected between the first and fourth suspension points and the first and second platform support points, two cables being respectively connected between the second and third suspension points and the first and second platform support points and two cables being respectively connected between the second and third suspension points and the third platform support point.

Abstract: A device for moving a platform at least in vertical direction along a facade (1) of a building defining a front face by means of a cable (16, 17) which extends along said facade, which device comprises winding means (14, 15) for said cable, which can be driven by driving means, and guide means for causing the cable (16, 17) to extend vertically along the facade on the outer side thereof, wherein means for moving the guide means in such a manner that said guide means pass the front face.

Abstract: A triangular tree bracket is vertically strapped to a tree trunk above a tree stand for a hunter with an outer end of the bracket positioned vertically above the hunter in the center of the tree stand. A safety strap attached to the end of the tree bracket hangs vertically downward connecting to the hunter. The hunter is able to turn 360° while attached to the safety strap hanging vertically from the tree bracket. A plate having a horizontal arched array of teeth extends laterally from a top and a bottom end of the bracket and into contact with and piercing the tree trunk. Straps are cinched around the tree trunk hooked to the ends of the plate to secure the bracket to the tree with the teeth piercing the tree trunk.

Abstract: Device for evacuating persons, for example from a multi-storey building on fire, from an evacuating location (4) to a secure location (3), comprising: a balloon (1) provided to be filled with a gas lighter than air for moving the balloon (1) between the secure location (3) and the evacuating location (4); guide means (5, 6) connected to the balloon (1) for guiding the balloon between the secure location (3) and the evacuating location (4); and transport means (7; 11, 13) connected to the balloon for transporting persons (8) from the evacuating location (4) to the secure location (3); wherein the device further comprises a cable (2) provided to be connected between the secure location (3) and the evacuating location (4) and that the balloon (1) is provided to be movably mounted on the cable (2) between the secure location (3) and the evacuating location (4).

Abstract: A driving apparatus includes a roller screw that includes a main shaft, a plurality of roller shafts projecting radially outwardly and upwardly at an angle from the radial direction of the main shaft and arranged along a helical line there around, and a plurality of rollers rotatably mounted on the roller shafts. The rollers are tapered to the same angle inwardly toward the main shaft. A rail member, adjacent to and axially oriented with the main shaft, includes a plurality of spaced projections adapted for radial engagement with the tapered rollers. The angle of the tapering is pre-determined to provide a sliding free engagement between the rollers and the projections with the interface there between being oriented to intersect the rotation axis of their respective roller shaft on the rotation axis of the main shaft. The rotation of the main shaft axially moves the roller screw relative to the rail member.

Abstract: A new multi-purpose portable davit anchoring system is provided, having a sectional vertical support mast which comes apart for compact stowage and is easily reassembled. The support mast incorporates a screw jack assembly which adjusts the height of the mast and biases the support mast between two opposing surfaces, such as a floor and ceiling. The biasing action enables it to be firmly yet removably attached to a building wherein the exterior walls are not load-bearing but merely sheathing, and to provide support for a damaged ceiling that might otherwise collapse. A boom member is removably fastened to the support mast, for deploying a lifting and lowering cable away from the side of the building. A mounting plate is provided for a winch assembly that can wind up the cable or release it at a controlled rate of speed.

Abstract: A movable safety tunnel rides on parapets within a bridge. The safety tunnel is locked in place in a respective section of the bridge while maintenance or other operations are performed on that section of the bridge. This allows the traffic to flow through the safety tunnel and along the bridge, and the safety tunnel shields the traffic from any dust or debris. When the maintenance on that respective section of the bridge has been completed, the safety tunnel is unlocked and pushed (and/or pulled) by suitable equipment to the next adjacent section of the bridge; and the safety tunnel is again locked in place as the maintenance is performed. This procedure continues, progressively, along the bridge. In one embodiment, the safety tunnel has a trolley system riding on respective rails constructed on top of the parapets.

Abstract: The present disclosure sets forth a safety device for scaffolding so that workmen can climb up or down on the exterior of the scaffolding in safety. The apparatus includes an outwardly extending curving davit having an elevated and radially outwardly extending end supporting, at an eyelet, a fall arrester. The fall arrester is anchored with a hook and an eyelet and has an elongate cable of adequate length extending down to a hook connecting with a D-ring on a body harness for a user. If the user falls, the fall arrester sets a brake preventing the cable from extending, thereby interrupting the fall of the workman.

Abstract: An apparatus for descent, suspension and retrieval of a worker through an opening in the ground includes a trailer having a boom assembly mounted thereon is described. The boom assembly includes telescopically extensible and retractable boom members that are extended downwardly by action of gravity through opening to a subsurface location. The worker is supported in a stabilized manner during descent, suspension, and retraction of the boom members.

Abstract: A scaffolding hanger is described. The invention is a refinement of scaffolding hangers used to support catwalks and recording equipment for use on television and film production sets. The hangers are suspended from hooks by chains attached to a ceiling. Catwalk platforms are supported upon the lower connecting platform between the front and rear upright members of the hanger. The weight of the catwalk and hangers is supported by the rear upright members and center upright members. The center upright members are set back from the front edge of the catwalk in order to provide clearance for recording equipment attached to a rail system secured to the front portion of the catwalk. A front upright member is of abbreviated height in order allow the recording equipment to be moved from one end of a production set to another along the suspended catwalk platforms without interference from the upright members of the scaffolding supports.

Abstract: A support structure for moveably suspending a work surface from the underside of a bridge includes at least a first clip mounted on each lower web of a pair of parallel bridge girders, a track mounted on each clip, and a scaffold member rollably suspended from the track, the work platform extending between the scaffold members. The scaffold members include a plurality of rollers that roll along the upper surface of each track such that the scaffold members are selectively rollable along the tracks. The clips are securely clamped to the lower webs of the girders such that the rails are securely and unadjustably spaced below the lower webs of the girders.

Abstract: A basket removably attachable to a support arm extending laterally outwardly from a helicopter, comprises a frame structure having a bottom support surface and a top surface joined together in an axially adjustable relationship. An opening is defined in the top surface of the frame structure for providing access to the bottom support surface. The frame structure is displaceable between collapsed and erected positions for selectively reducing and increasing its height, whereby the basket can be carried in its collapsed position and, once on site, extended to its erected position for safely receiving at least one operator.

Abstract: A movable safety tunnel rides on parapets within a bridge. The safety tunnel is locked in place in a respective section of the bridge while maintenance or other operations are performed on that section of the bridge. This allows the traffic to flow through the safety tunnel and along the bridge, and the safety tunnel shields the traffic from any dust or debris. When the maintenance on that respective section of the bridge has been completed, the safety tunnel is unlocked and pushed (and/or pulled) by suitable equipment to the next adjacent section of the bridge; and the safety tunnel is again locked in place as the maintenance is performed. This procedure continues, progressively, along the bridge. In one embodiment, the safety tunnel has a trolley system riding on respective rails constructed on top of the parapets.

Abstract: An apparatus for attachment of a davit mount for holding a scaffolding over the side of a building attaches directly to a structural column of the building, and eliminates the need for both a safety anchor located atop and within the roof inwardly from the roof edge, and a safety line extending back to that safety anchor. Because of the indicated apparatus, the structural integrity of the roof surface need not be compromised in order to install that safety anchor, and secondly no safety line remains extended over any portion of the roof so as to constitute a safety hazard.

Abstract: A power driven tree stand including an elevator assembly having a pair of parallel primary rails and a pair of parallel secondary rails. A primary axle couples the primary rails and a secondary axle couples the secondary rails. A pair of primary tires are rotatably received on the primary axle. A pair of secondary tires are rotatably received on the secondary axle. A pair of parallel support rails have free first ends and second ends pivotably coupled by pins to the exterior ends of the primary rails and a plurality of tubular cross bars there between for receiving a wheelchair thereupon.

Abstract: An outside up-down elevator, designed to be smoothly and safely raised without an initial downward movement when the outside up-down elevator is restarted in an ascending direction after it is temporarily stopped during an operation, is disclosed. In the outside up-down elevator, a seat frame is moved upward or downward under the guide of two ropes, thereby allowing a worker to work safely and stably without having any intervention between the ropes and the worker. The outside up-down elevator also has a constant speed control means, thus stably and safely descending at a constant speed. Two side walls, respectively enclosing first and second control units, are hinged to both side edges of the seat frame and so the outside up-down elevator can be fully folded suitable for being transported by a user. It is also possible to manually adjust horizontality of the seat frame using two adjusting gears without disassembling the outside up-down elevator.

Abstract: A hoist is provided that aids in construction and/or maintenance tasks at elevated heights. The hoist is equipped with a centrally located stabilizer through which a steel cable connected to an electrically operated winch is routed. The hoist is raised and lowered through the use of a control station located within reach of the seat.

Abstract: A raising and lifting device comprises a shank member and an elevating device. The shank member has a first leg with a threaded portion for threaded attachment to a tree or similar structure; a second leg attached to the first leg substantially normal thereto; and a third leg attached to the second leg substantially normal thereto at the end of the second leg opposite the first leg. The elevating device is secured to the third leg. The elevating device comprises a pulley secured to the shank, around which a rope or similar device may be passed to raise a tree blind or other load up a tree or similar structure by pulling.

Abstract: A new suspended work platform for providing a platform for working on projects that can be raised out of the way when not in use. The inventive device includes a support structure, a platform member, and a suspension structure for suspending the platform member from the support structure. The suspension structure includes a vertical adjustment member, a translational adjustment member, and a turret member to allow adjustment of the vertical position, the horizontal translational position, and the horizontal orientation of the platform member in relation to the support structure.

Abstract: A suspension support device provided movably on the upper surface of a building for suspending, by means of ropes, an outer wall working machine having fitting and moving members which can be fittedly engaged in a pair of guide grooves formed vertically on an outer wall surface of the building, and lowering and lifting the outer wall working machine along the guide grooves includes a main body comprising a movable base capable of moving on the upper surface of the building, a rotary body provided on the movable base rotatably about a vertical first axis and a winding device for taking up and feeding out the ropes, a pivotable arm supported on the main body pivotably about a vertical second axis, and a holding unit provided on the foremost end portion of the pivotable arm rotatably about a vertical third axis and including a pair of holding guide members provided at an interval equal to an interval of the pair of guide grooves and capable of receiving the fitting and moving members.

Abstract: A vacuum wall walking apparatus includes an annular body frame, a plurality of leg mechanisms extending downward from the body frame, and a plurality of suction cups attached to fore ends of the respective legs. The body frame is composed of a flexible member. The body frame thus constructed is bendable to conform to the profile of a curved surface when the vacuum wall walking apparatus is used with a wall having such curved surface. With this bending or deformation of the body frame, the suction cups are always able to retain an optimum posture to insure that the vacuum wall walking apparatus is stably held on the curved surface of the wall by a vacuum formed in the suction cups. The vacuum wall walking apparatus may include a surface treatment mechanism, in which instance a winch is provided to minimize or substantially eliminate the load exerted from the surface treatment mechanism to the vacuum wall walking apparatus.

Abstract: A device for vertical as well as horizontal snapling along and across an exterior surface of a structure such as a building comprising a substantially horizontal guiding member being secured onto the edge of the roof of the structure, a horizontally translating first pulley being translatably attached to the guiding member, the first pulley being horizontally translatable relative to the guiding member, the first pulley including a first attachment and, a snapling equipment attached to the first attachment of the first pulley.

Abstract: A spray containment enclosure assembly for use during the spraying operation on a work surface to prevent escape of airborne particles to the environment. The assembly includes a support arm, a personnel basket sized to receive a worker therein, a rigid enclosure attached to the personnel basket. The rigid enclosure is positioned with respect to the personnel basket such that when the worker is in the forward portion, at least a portion of an upper torso of the worker is within an interior area. The rigid enclosure has an open front side that is adapted to be positioned adjacent to the work surface to form an airway gap therebetween to allow air to flow into the interior area. A fan mounted to the rigid enclosure is adapted to create negative pressure in the interior area to draw air inwardly through the airway gap.

Abstract: A skyrise window panel installation assembly including an heavy duty cable structured to extend down a side of a skyrise and be securely anchored at a point above an installation location. The assembly further includes a winch assembly having a rigid and strong drive frame at which the cable is received and securely engaged for secure guided, driven interconnection, selectively up and down a length of the cable, thereby providing for the effective positioning of the winch assembly in a desired position relative to the window panel installation location. Secured to the drive frame is a primary operator chair wherein a primary operator sits in confronting relation to the side of the skyrise in order to effectively and precisely position the winch assembly in the desired position. Extending from the drive frame is a connection bracket, to which a suction assembly is secured. The suction assembly includes a mount frame and is disposed in a generally vertically disposed orientation along the side of the skyrise.

Abstract: An emergency escape elevator features a release device for releasing the elevator from its tethering cable, allowing the elevator to descend under the force of gravity. A vertical descent control apparatus controls the rate of descent of the elevator by measuring the rate of descent of the elevator and applying a brake to keep the elevator falling at a desired safe rate. The elevator guiderails are tapered inward at the bottom of the elevator shaft to apply friction to the elevator to slow it down. The elevator shaft can turn at the bottom and become horizontal to aid in slowing and stopping the elevator.

Abstract: An overhead platform elevation device for moving objects between a lower level of a building structure and an overhead storage space is provided including a rectangular platform having a base plate and a centrally disposed supporting surface, a motor assembly, opposed pulley assemblies, a plurality of platform adjustment cables, drive cables and telescoping stabilization members. The device of the invention is self storing, having the base plate of the platform raised flush with the ceiling of the building structure when in its raised storage position.

Abstract: A rail bridge rescue frame comprises three elongated legs having upper and lower ends. The upper ends are secured to a head assembly so as to universally pivot with respect thereto. Two of the legs are forward legs of shorter and similar length and the third is a rear leg of longer length. Means are secured to the lower end of each of the forward legs to bear against a side portion of a rail. Means are attached to the lower end of the rear leg to secure to a portion of a rail. The frame is constructed so that when the rear leg is secured to one rail of a railway and the lower ends of the forward legs are bearing against outer portions of an adjacent rail thereof, the head assembly will be positioned clear of the railway to one side to provide support for a line to lift a person or the like below the railway up to the level of the railway.

Abstract: A self contained portable device for use on the roof of a building for retrieving a lifeline from along the side of the building. A motor and drum drive assembly is mounted on a movable cart. An adjustable davit arm is pivotally mounted on the cart and is adapted to extend over the edge of the roof. The lifeline extends around a sheave mounted on the outer end of the davit arm and through a rope grab clamp and then about the take-up drum of the drive assembly. The davit arm is formed by telescopically joined tubular arm sections. The motor is controlled by a foot operated switch for rotating the drum to retrieve the lifeline. A safety line is adapted to secure the cart to rigid structure on the roof in addition to a wheel brake.

Abstract: A frame and ladder assembly which includes an electrically conductive frame that is provided to engage two, generally parallel, aerially suspended, transmission conductors of a phase bundle and to be supported therefrom; within the frame a side opening structure which defines a cradle is provided, and in the cradle structure is provided means to engage the phase, such as a plurality of rollers with circumferential recesses, so that the frame can be repositioned along the phase similar to a carriage, without disengaging the frame from the phase; the ladder assembly comprises an insulated triangular ladder assembly which is attached at its vertex to the frame and hangs beneath it, permitting a line worker situated on the ladder assembly to easily perform maintenance and repairs on an energized phase directly above the ladder assembly; the ladder assembly is also comprised of pivotally connected ladder legs so that when the top of one of the two inclined side ladders is released from the frame, the other ladder

Abstract: Apparatus for use, in conjunction with a fall arrester or load winch means, when servicing a closed vessel having a top or side manway. The apparatus being adaptable for either exterior or interior mounting having universal, flexible supporting means. The apparatus further comprising a universal bracket means for operably receiving a fall arrester or load winch, mountable in a vertical position to the manway's cover flange.

Abstract: A moveable, rigid enclosure having a work platform enclosed therewithin and which is sealed against a work surface. A negative pressure is applied to the interior of the enclosure. The rigid enclosure is supported by the inner work platform, and includes a funnel-shaped bottom portion coupled to a conduit for collecting and transporting of spent blast materials and debris contained within the enclosure which is released during blasting of the work surface. Blast media is supplied to the worker by a supply conduit extending interior of the rigid enclosure. A controller is positioned within the enclosure by which the worker while within the enclosure can adjust the vertical or horizontal position of the enclosure.

Abstract: A movable support device for supporting a window-washer along a side wall of a building for cleaning windows. The device has a foldable framework that can be folded into a compact position for ease of handling and transport, and includes a pair of adjustable legs that engage and roll along the building side wall for mounting the mobile support device thereon. The device further includes wall engaging wheels that engage the upper surface of the parapet of the wall and are driven by a drive means remotely actuatable by a worker suspended from the device. The device is movable laterally along the upper surface of the parapet of the wall as necessary by the worker for cleaning windows across the face of the building.

Abstract: A tender box adapted for use with a crane or other hoist device for providing an elevated working area. The tender box includes a frame and a platform with upper and lower decks. The lower deck provides a storage area for material and equipment and the upper deck defines a work area. The tender box includes a detachable test weight, which is located beneath the lower deck, and side arms and spacers, which space the tender box from the face of a vertical structure.

Abstract: A device for suspending a working cage includes an arm, a swivel arm mounted rotatably horizontally to the end portion of the arm, a first sheave mounted rotatably horizontally to the arm at a location behind the end portion to which the swivel arm is mounted, and a second sheave mounted rotatably horizontally to the swivel arm in front of the center of rotation of the swivel arm. The first and second sheaves have the same diameter and are formed with at least two vertically arranged wire rope engaging grooves. At least two wire ropes fed from a winding device and attached to a working cage through these sheaves cross each other between the first sheave and the second sheave. The distance between the center of rotation of the swivel arm and the center of rotation of the first sheave is determined to be equal to the distance between the center of rotation of the swivel arm and the center of rotation of the second sheave.

Abstract: A working gondola which carries a worker for cleaning e.g. glass windows of a building structure, has two powered winches for winding and unwinding two ropes respectively for up-, down-, left-, and rightward movement of its gondola, whereby cleaning of an extended area can be conducted with efficiency.

Abstract: A boom assembly for mounting on the roof of the building provides a pulley which receives a cable for depending over a front edge of the building to allow lifting or lowering of materials attached to the cable. The boom assembly can be folded to a relatively small packaged arrangement for ready transportation. The boom assembly can be adjusted to accommodate different orientations of support surface for example inclined or angled roof structures. The boom arrangement includes a vertical post, a counterbalance pole extending rearwardly from the base of the post and a pair of arms extending at right angles to the counterbalance pole. A brace is connected between the top of the post and the counterbalance pole with the base extending outwardly and carrying the pulley at the outer end. A cable arrangement extends between the pulley and a rear end of the counterbalance pole.

Abstract: An electrically insulated support or the like is mounted on a helicopter to extend from both sides of the helicopter. A bucket for equipment, material and/or a worker is provided, which can be engaged or disengaged at the end of the support. To carry out operation on a high voltage line or installations, the bucket with its equipment, material and/or worker is hooked at one end of the support and is carried by the helicopter to a location of the high voltage line or installations where an operation has to be carried out. The operation is done while the helicopter holds the bucket or most preferably, the bucket which is provided with suspension wheels is mounted on the line conductors or installations and the helicopter is moved away while the operation is being carried out.

Abstract: A scaffold is arranged for temporary mounting to a canted roof to include an anchor bracket arranged for positioning to the roof peak, wherein a base platform pivotally mounts a support platform to orient the support platform in a horizontal alignment relative to the associated roof surface employing arcuate first and second legs mounted to a rear edge of the platform adjustably directed through sleeve members in fixed securement to the support platform.

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: The invention permits the replacement of a used section of an overhead cable (1) by a new section without depositing said cable on the ground. A nacelle or pod mainly includes a drum (20) onto which is wound the new section to be deposited and on which will be wound the old section to be replaced. The nacelle also includes guide pulleys (14, 16) for the cable (1). The nacelle is suspended on a helicopter by means of a rope, an upper beam (32) and optionally via pyrotechnic means (46) and ball and socket joints (38). It can be completed by jaws (44) for fixing to the cable (1). The invention has application to electric power distribution and transporting cables and to cable railway cables.

Abstract: The nacelle (2) permits the rapid replacement of a coupling sleeve (38) between two portions of an overhead cable (1) without depositing said cable on the ground. The nacelle (2) is a metal structure carrying operators and tools. It is suspended on a helicopter, which positions it against the overhead cable (1) and maintains it throughout the change operation for the sleeve (38). By using a force take-up jack (40) at the ends of the sleeve (38), it is possible to replace said sleeve (38) or carry out other operations with respect to this point of the cable (1). The nacelle (2) has pyrotechnic jettisoning or release means. Application to the replacement of sleeves on overhead cables.

Abstract: The present invention provides nacelles or cars (10) and a catwalk or platform (30) which make it possible to instantaneously place one or more operators (2) on overhead cables (1) for carrying out different work activities. Each nacelle (10) is a preferably latticed, metallic structure having pivoting walls (8) for extending the field of action of each operator. Each nacelle has means (5) for attaching to the cables (1). The catwalk (30) can be opened out and is located at the ends of each of the nacelles (10). The present invention is particularly adapted for used in the maintenance and arrangement of electric cables.

Abstract: A support assembly is composed of three elongate substantially rigid members which may be releasably interconnected by connectors to form a triangular support structure. The rigid members when disconnected from the support bracket configuration are constructed to be assembled in a nested configuration and connected together in such nested configuration for compact carrying and storage. An extensible gambrel for use with the support bracket in its operative condition also is constructed to be attached to the nested members for convenient carrying and storage.