Abstract: A line roller assembly is provided including a base assembly including a clamping assembly configured to clamp the base assembly to a parapet wall surrounding a roof of a structure or other installation, a carriage assembly slidably mounted on the base assembly, said carriage assembly including at least one arm including a roller at a distal end, said carriage assembly movable between at least one extended position and a medial position, and said at least one roller includes a groove configured to receive a line for aiding the line over the parapet wall, wherein in the at least one extended position the at least one arm extends a pre-determined distance over an edge of an outer wall of the structure or the at least one arm extends a pre-determined distance over an inner edge of the parapet wall of the structure over the roof.

Abstract: The present disclosure relates generally to personnel lift vehicles that include a carriage, a telescoping lift and a load carrying frame. The telescoping lift is connected to a rear portion of the carriage and the load carrying frame is connected to and extends forward from the telescoping lift. The load carrying frame includes a bottom portion that provides an operator platform that is disposed at a central portion of the carriage between a front portion and the rear portion of the carriage. The configuration of the disclosed personnel lift vehicle provides an integral solution for counterweight requirements for the carriage while reducing the overall driving space required for the vehicle.

Abstract: A hand truck for moving water heaters and toilets has a fixed frame with one or more fulcrum wheels on a rear side, at least one floor stabilizing arm coupled to and extending from a front side, at least one outrigger support beam extending from the rear of the fixed frame, the at least one outrigger support beam further comprising a wheel at a distal end; and an extendable frame having a vertical beam, a horizontal beam coupled to the top of the vertical beam, and at least one lifting arm extending perpendicularly to the horizontal beam; the extendable frame vertically adjustable in relation to the fixed frame.

Abstract: The device for setting up a dismountable and/or foldable shelter includes at least two vertical posts that are each equipped, at different levels, with at least two substantially horizontal arms having a free end which is provided with fasteners in the form of a clip. There is at least one telescopic longitudinal member provided, at each of its ends, with an articulated connector which engages with a junction ring that is mounted so as to move in translation on each of the two posts. The junction ring includes a device for preventing movement in translation along the post.

Abstract: A loading platform (1) for telescopic handlers comprises a bottom plane (2) provided for supporting operators and/or equipment and associated with sidewalls (3, 4). The plane (2) and the sidewalls (3, 4) include respective first interlocking and/or hinge means (31, 221) such that the sidewalls (3, 4) can be secured removably to the plane (2), thereby defining a mountable and demountable platform (1).

Abstract: There is shown a mounting system for a crane that utilizes frictional engagement to a wall surface and does not use counterweights or conventional methods to resist crane forces.

Abstract: An arrangement for overcoming heights or vertical distances, such as, in particular, high-voltage towers, towers for wind installations, buildings, high-bay warehouses, etc., has a longitudinally extended, rail-like profile (7) or guide member, and at least one portable lift element which is releasably fastenable to the profile, consisting of a driving part (3) which is movable up and down along the profile or guide member and a platform (5) for receiving at least one person or loads.

Abstract: A unique roadworthy boom trailer comprises a roadworthy wheeled chassis, four independently-adjustable trailer-leveling motorized legs attached to the bottom of the chassis, pneumatic-tool compressor built in the chassis, turret assembly attached to the top of the chassis, and on-site-extendable-interchangeable quick-release assemblies of boom, ladder, and catwalk rotatably attached to the turret assembly. The ladder assembly has safety rungs for safety cables to be hooked thereon. The catwalk assembly has adjustable telescopic safety handrails. The unique roadworthy boom trailer can work with suspension-cable-or-truss-type bridges, low-or-high-power-line bridges, short-or-tall-supporting-column bridges, single-or-multiple-lane bridges, and regular-or-rail-road bridges. The catwalk assembly can have multiple additional catwalk assemblies attached thereto to extend its width or length to generally equal the width or length of a bridge, respectively.

Abstract: The present disclosure relates generally to lift vehicles that include a carriage having at least three wheels, a lift and a load carrying frame. The load carrying frame is connected to the lift, which is connected to the carriage. A selectively deployable platform is disclosed that is pivotably connected to the carriage and movable between a stowed position and a support position. At least two rollers may be spaced apart and configured to engage and slidably support a battery above the carriage.

Abstract: A suspension platform system having a work platform suspended from at least one modular mast by a hoisting system. The modular mast is composed of at least two mast units stacked vertically and attached to one another. Each mast unit has a multifunction rail including a plurality of safety engagement devices and a stabilizer guide device. The work platform has at least one mast stabilizer that cooperate with the stabilizer guide device to prevent undesired swaying of the suspended work platform. The hoisting system includes a carriages, hoist, and mast cable. The carriage engages the associated mast so that the carriage may be conveniently slid up and down the mast.

Abstract: A suspension platform system having a work platform suspended between a sinistral modular mast and a dextral modular mast by a hoisting system. The modular masts are composed of at least two mast units stacked vertically and attached to one another. Each mast unit has a multifunction rail including a plurality of safety engagement devices and a stabilizer guide device, and a unit interconnection device. The work platform has at least two mast stabilizers that cooperate with the stabilizer guide devices to prevent undesired swaying of the suspended work platform. The work platform has a plurality of platform mast engagers cooperating with at least one of the mast safety engagement devices to releasably lock the platform to the modular masts. The hoisting system includes multiple carriages, hoists, and mast cables. Each carriage engages the associated mast so that the carriage may be conveniently slid up and down the mast.

Abstract: An escape device for high-rise buildings includes an escape capsule, a speedup gear mounted to the escape capsule, a track provided with a rack with which the speedup gear is engaged so that the escape capsule can move along the track, and a damper including a rotor. The speedup gear in operation drives the rotor into rotation and the damper is capable of converting a portion of kinetic energy of the escape capsule to the electric energy. The escape device can be braked at any position at a building.

Abstract: A method of servicing a wind turbine generally comprises rotating a rotor of the wind turbine until a blade extends downwardly next to the wind turbine tower. A work platform is positioned next to the tower with at least one steering wheel in contact with the tower. The work platform is connected to an upper part of the wind turbine with at least one cable and then moved vertically and horizontally to a first position. A section of the blade within reach is serviced in the first position, and then the work platform is moved vertically and horizontally to a second position for servicing a different section of the blade. The steering wheel is in contact with the tower when the work platform is moved.

Abstract: A work platform for use in performing maintenance while supported on an overhead crane. The work platform is particularly useful for performing maintenance on overhead cranes located in areas where normal lifting equipment and/or scaffolding cannot easily access the overhead crane. However, the work platform is also useful for performing maintenance on equipment and/or structures in the vicinity of overhead cranes, and on overhead cranes located in areas without accessibility problems. The work platform is hoisted for placement on support structure of the overhead crane by hoist apparatus of the overhead crane. When positioned, the work platform may be fully supported on the support structure of the overhead crane.

Abstract: A self-erecting suspension platform system having a work platform suspended between a sinistral modular mast and a dextral modular mast by a hoisting system. The modular masts are composed of at least two mast units stacked vertically and attached to one another. Each mast unit has a multifunction rail including a plurality of safety engagement devices and a stabilizer guide device, and a unit interconnection device. The work platform has at least two mast stabilizers that cooperate with the stabilizer guide devices to prevent undesired swaying of the suspended work platform. The work platform has a plurality of platform mast engagers cooperating with at least one of the mast safety engagement devices to releasably lock the platform to the modular masts. The hoisting system includes multiple carriages, hoists, and mast cables. Each carriage engages the associated mast so that the carriage may be conveniently slid up and down the mast.

Abstract: An elevating platform assembly is provided. In accordance with one exemplary embodiment a platform is present and is moveable along a travel distance of a mast. A cylinder is provided and is capable of being actuated. The cylinder is used to move the platform along the travel distance.

Abstract: A platform lift apparatus enables the safe movement of objects to and from an attic storage space. The platform lift apparatus includes a frame, a drive mechanism, and a platform. The frame includes internal and external mounting surfaces. The drive mechanism is substantially disposed within the frame and is coupled to the internal mounting surfaces. The drive mechanism includes a plurality of rotatable, parallel shafts with each shaft further including at least one lift drum having an associated lift tether at least partially wound thereon and having an end hanging therefrom. The platform is coupled to each lift tether end and is thereby suspended from the frame. The platform is selectively movable by operation of the drive mechanism within in a vertical dimension between raised and lowered positions. The drive mechanism further comprises an electric motor operatively coupled to the plurality of parallel shafts.

Abstract: A portable elevator climbing system removably attachable to a cantilevered overhang on an adjacent structure, whereby an elevator car travels up and down a plurality of roller chains. The roller chains are engaged with sprockets and guide rollers attached to an axle driven by a motor. The orientation and alignment of the sprockets, guide rollers and roller chains provide for a stable elevator car and for a system free of backlash in both directions. The elevator climbing system includes a dampening assembly to control the rate of decent in the event of transmission, motor or other failure. The elevator climbing system may be controlled so that the start and stop of the motor is coordinated with the release and application of a braking assembly. The efficiency of the elevator climbing system may be varied by adjusting the offset between the sprockets and the guide rollers.

Abstract: The invention relates to a method of servicing the outer components of a wind turbine such as the wind turbine blades and the tower with a work platform, said method comprises the steps of: positioning the work platform at the wind turbine tower and connecting the work platform to an upper part of the wind turbine with at least one cable. Further the method comprises the steps of raising the work platform with the cable and cable winding means to a position of use, and holding the work platform to the side of the wind turbine tower with holding means. The invention also relates to a work platform for servicing the outer components of a wind turbine.

Abstract: A maintenance platform for suspension on support cables, in particular for maintaining rotor blades of wind turbines, wherein the maintenance platform is formed by at least two sub-platforms defining a working plane, wherein said sub-platforms are swivably connected to each other by a swivel joint with a swivel axis substantially perpendicular to the working plane.

Abstract: A rigging, operable to raise and lower the platform, passes through a restraint device comprising a tension holder. The tension holder comprises a first body having a substantially planar face surface and a rear portion having a divot disposed therein. A second body, substantially similar to the first body; and having a substantially planar face surface; is disposed in a substantially facing arrangement with the first body to permit a line to pass between the substantially planar face surfaces. A lever is disposed in the divot of the first body and is operable to draw together the substantially planar face of the first body and the substantially planar face of the second body whereby friction can be selectively applied to the line when the line is disposed between the substantially planar first surface and said substantially planar second surface.

Abstract: Reed's High-Rise Emergency Rescue Egress System, a conventional truck chassis fitted with a hydraulic lift system for access into and the evacuation of individuals from high-rise buildings. The technology is comprised of the following components: A control room located behind the cab of the truck, which is used to operate the lift system, monitor system operations, detect chemical, radiological, biological or other hazardous agents, and provides communication support; an gondola cabins which provides protection while transporting personnel and equipment up and down. The gondola has the ability to be connected to a building's internal/external water stand-pipe system to allow hoses to be used directly from the cabin and an audio/video monitoring system that transmits information to the control room; a mechanical lift system, which utilizes hydraulic and electrical lifts. The lift system is powered by the vehicle's motor.

Abstract: A portable anchor for supporting a line along a side of a structure, having a beam member comprising a line support end and a counterweight end distal to the line support end, a counterweight attachable to the beam member at a counterweight location proximate the counterweight end, a support member that supports the beam member at a pivot location arranged between the line support end and the counterweight end, a line stand-off rotatably mounted to the support member and rotatable from a line deployed position and a storage position where the line stand-off guides the line away from the side of the structure in the deployed position; and an adjustable locking device that allows rotation of the support member, and selectably fixes the support member to the beam member at a selected angle.

Abstract: Device for supporting a platform that is used to lift loads or persons the height of a structure. Together with a platform, the inventive device includes winch-type platform-lifting elements and modular assemblable mast-forming elements. Each mast element is installed using the load platform which can be connected to the masts by: (i) the aforementioned winch-type lifting elements which can be disconnected at will from the masts, and (ii) elements for temporarily blocking the movement of the platform in relation to a modular element of each mast. In this way, when the movement of the platform is blocked, a modular element can be added to, or removed from the top of the masts in accordance with the desired platform lifting height. The platform is positioned between two modular independent masts which form a lifting and guiding path.

Abstract: A scaffolding lift system includes a base member and a plurality of elongated vertical support members secured to the top surface of the base member. A power-operated motor is positioned adjacent the scaffolding and on the base member. The scaffolding further includes a plurality of elongated horizontal support members connected to select ones of the plurality of vertical support members and extend rearwardly thereof. An elongated boom is engaged with the rear portion of the scaffolding and extends forwardly therefrom. The scaffolding further includes a plurality of pulleys connected thereto and disposed adjacent to the boom at different heights respectively. A flexible elongated cable is supported by the plurality of pulleys and has a first end portion secured to the motor. The cable further has a second end portion including a hook mechanism for selectively engaging a pallet.

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 fall protection lanyard apparatus incorporating an automatic emergency release is disclosed. Competing concerns of fall protection (for the load) and on-demand emergency release (for the aerial lift) are each enabled by providing the first lanyard with a quick release mechanism and the second lanyard with a release triggering mechanism. The lanyard apparatus is adapted for attachment to a human or non-human load. The first lanyard incorporates a quick-release mechanism, which, upon activation, results in the separation of the connectable end portion thereof. The second lanyard incorporates a mechanism for activating the quick-release upon application of a predetermined force thereon. The lanyard apparatus provides total fall protection during the transfer of a load to a structure in any elevated environment while providing an on-demand quick-release in emergency situations.

Abstract: There is an anchor for securing a working line (54) to a structure. The anchor includes a sole plate (2) with an attachment (19) for the working line (54). There is at least one friction plate (5) and a connector strap (4). In use of the anchor the sole plate (2) and friction plate (5) are located against respective opposite sides of a rafter (3) of the structure and are linked together by the strap (4) in a manner such that the working line load on the sole plate (2) generates a clamping force between the sole plate (2) and the friction plate (5). This force resists movement of the anchor by gripping only the outside of the rafter (3).

Abstract: A versatile construction hoist system comprises a hoist trolley having a first pair of connection members, and a work platform having a second pair of connection members. The work platform is releasably connectable to the trolley through interconnection of the first and second pairs of connection members with the work platform in a horizontal position in which the work platform floor is situated at the first level relative the trolley. A transport platform, which has a third pair of connection members, is releasably connectable to the trolley through interconnection of the first and third pairs of connection members with the transport platform in a horizontal position in which its floor is situated at a second level relative the trolley, said second level being below said first level. An adapter enables use of standard transport platform elements.

Abstract: A multifunctional highrise escaping device capable of moving up and down, left and right as well as forward and rearward mainly includes a machine base disposed with a rotary disk on the bottom portion thereof to connect an expansion steel rack; two winding machines are disposed at the upper aspect of the machine base; one side of the machine base is disposed with two wire reels coiled by wire ropes. The winded wire ropes on the winding machine extend along the expansion steel rack to suspend a tank body at the front end of the steel rack. The machine base is disposed on the top of the highrise and rotates via the rotary disk turning at 360 degree. The winding machine pulls the tank body to ascend and descend as well as to move left and right, so as to descend slowly for escaping in a fire accident.

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 fall protection lanyard apparatus for use in transferring loads in an elevated environment is disclosed. The fall protection lanyard may be connected to a load and used to safely transfer a human or nonhuman load in an elevated environment, such as from an airborne rotorcraft to an adjacent structure while providing fall protection for the load and emergency release capabilities for the aircraft. The lanyard apparatus provides total fall protection for the load throughout the transfer process without restricting or otherwise limiting available emergency flight options/maneuvers by incorporating an emergency release that automatically activates on demand. In a preferred embodiment, the fall protection lanyard apparatus includes first and second load-bearing lanyards, each terminating in a free end incorporating a connectable hook.

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 portable roof anchor having a slidably adjustable beam member is supported at a pivot location near a line support end and at an opposed end by a rotatably attached self-leveling counterweights. A line wrapped onto the beam member may be used as a handle for carrying the beam member to a roof top, then used to support a person or equipment over a side of the building. The counterweights have a relatively small top cross-section and a relatively large bottom cross-section so that, for any given amount of weight, a relatively large bottom surface area and a relatively tall height from the rooftop will be provided. A handle is provided near a line-deployed center-of-gravity so that the roof anchor assembly may be easily maneuvered, while the line remains over the side of the building, with one hand on the handle and a second hand cradled underneath the beam member.

Abstract: A sleigh-shaped device, having a longitudinal axis and a transverse axis, for use in a mining raise. The sleigh-shaped device has a base frame for sliding along the mining raise in a direction parallel to the longitudinal axis, the base frame having a bottom surface with sliding runners extending parallel to the longitudinal axis, and a top surface having front and rear opposite ends. The device also has a tiltable platform pivotally mounted to the top surface of the base frame between the front and rear ends about a first axis parallel to the transverse axis, and platform adjusters cooperating with the base frame and the tiltable platform for adjusting the tiltable platform with respect to the base frame. The device further has connecters for anchoring the base frame to a pulley system to provide movement of the sleigh-shaped device along the mining raise, the front and of the base frame extending below the rear end of the same during movement of the sleigh-shaped device along the mining raise.

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 Roof Guard device (10) when an individual lifts an object (96) on to a roof structure (14) from a lower level that includes a stepplate (12) removably received upon a horizontal perimeter portion of the roof structure (14); a guardplate (16) pivotally joined to the stepplate (12); the guardplate (16) being positioned adjacent to a selected portion of the roof structure (14) to prevent the object (96), being raised from the ground, from contacting the selected portion of the roof structure (14). An alternative embodiment of the device (300) includes two methods of operation that allow the device (300) to be manually adjusted into a maintained position or “automatically” adjusted by a tensile rope engaging a guardplate (306).

Abstract: A handicapped duck blind elevator system for elevating/lowering handicapped individuals to and from a conventional duck blind structure. The inventive device includes a support frame that is mounted adjacent a conventional duck blind, a lift cage frame slidably retained within the support frame, a winch attached to the support frame for elevating/lowering the lift cage frame, and a boat ramp positioned within a conventional duck boat. A first ramp is provided within the lift cage frame for loading/unloading an individual within a wheelchair from the boat ramp into the floor of the lift cage frame. A second ramp is provided within the lift cage frame for unloading/loading an individual within a wheelchair from the conventional duck blind.

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 lifting scalfold assembly with several scaffolding poles which stand on a base and which are extendable in length and, between which mobile platforms are situated such that they can be adjusted in height, whereby the scaffolding poles are attached to a building by means of holding supports each scaffolding pole includes at least a girder section housing which at least a gear rack on an inside and a gear rack on an outside thereof. On the mobile platforms cogwheels and drives for the cogwheels running on the outer gear racks are provided. A sliding module or carriage includes cogwheels and drives for the cogwheels running on the inner gear connected to the girder section. Conduction rails are included on the scaffolding pole, and current collectors are positioned on the connectable mobile platforms and the sliding modules.

Abstract: A scaffold system having modular components including interconnectable side walls or side trusses having extruded upper and lower truss members, decks and various section connectors which are interchangeable simplifying transportation, minimizing storage and reducing inventory requirements. Single person set-up and take-down is provided in a modular scaffolding system allowing assembly of a vast array of configurations that accommodate various architectural shapes. Drop-in assembly of aluminum side trusses of modular scaffold sections with steel modular scaffold section connectors provides strong construction. Spring loaded latched are used to maintain decks in place at modular scaffold section connectors.

Abstract: An elevating apparatus comprises a rack (1) supporting the apparatus, and an elevating platform (7) adjustable in height and suitably guided by at least one mast (8) or column. The mast (8) may be moved from a transport position into an operating position by having it pivoted about a horizontal tilting axis (9) on the rack (1). The axis (9) is arranged at the end of two parallel beams (2) of the rack (1) so as to enable the mast to be folded between these beams (2), thus practically requiring no additional space during transport.

Abstract: An upstanding support structure is provided defining an elevated horizontally elongated stationery platform extending along one side of the support structure and a horizontally elongated second platform is mounted, in cantilever fashion, from the one side of the support structure for vertical shifting relative thereto so as to be downwardly displacable over the upper portion of an elongated bulk material receiving vehicle disposed along side the one side of the support structure adjacent the lower end thereof. The second platform includes a first side fence extending along the side thereof adjacent the support structure as well as end fences extending across the ends of the second platform and appreciably outwardly beyond the outer side of the second platform.

Abstract: A carrier having (a) a frame having a middle portion transversely formed between two lateral portions attachable to and detachable from a layer of wall formed between two shutters, the lateral portions having a length more than twice as great as the height of the shutters and (b) a rectilinear elevator operatively linked to the middle portion of the frame so that the frame is slidable upwards and downwards by means of the elevator. The elevator moves itself upwards relative to the frame when the lateral portions of the frame are attached to a first layer of wall so that the frame carries workers who install shutters between which concrete is grouted for a second layer of wall. The elevator moves the frame upwards relative thereto when the second layer of wall solidifies so that the lateral portions of the frame can be detached from the first layer of wall and attached to the second layer of wall and that the elevator can move itself upwards relative to the frame.

Abstract: A portable, manually adjustable work station (10, 60) for use on a support surface. The work station (10, 60) includes a frame assembly (12) and a platform member (18, 68). The frame assembly (12) has a base portion (14, 72) and a support portion (16, 70) extending vertically from the base portion (14, 72). The work station (10, 60) further includes a mounting assembly (30, 80) cantilever mounting the platform member (18, 68) to extend from at least one side of the support portion (16, 70) in several elevated positions relative to the base portion (14, 72). The mounting assembly (30, 80) is formed for movement between the elevated positions upon unweighting and tilting of the platform member (18, 68), and for automatic securing of the platform member (18, 68) in a selected elevated position upon rotating in the reverse direction and weighting of the platform member (18, 68).

Abstract: A lift has a base frame supported on a pair of screw jacks and a pair of support legs when a multi-stage mast on the lift is to be raised. The support legs are slide mounted in guides and each is downwardly biased away from a control switch on the base frame so that the switch is open unless the leg is loaded by the weight of the lift. A transport carriage is mounted to roll on sloped tracks on the base frame and is connected to the base frame by a hydraulic cylinder unit which functions when activated to pull the carriage downwardly into ground engagement to take the load of the lift from the jacks and support legs. A control circuit prevents the mast from being raised while the lift is supported on the carriage.

Abstract: A hoist apparatus includes a support member having first and second opposite end portions. A winch including a winch motor and a winch reel rotatable relative to the winch motor about a reel axis is secured to the first end portion of the support member and a flexible tension link is windable on the reel. The apparatus is provided with provisions for releasably connecting the second end portion of the support member to an object such that the first end portion projects from the object, the releasable connecting provisions being dimensioned and positioned on the second end portion to resist forces imposed by the winch on the support member to prevent movement of the support member relative to the object.

Abstract: A traveling device for raising or lowering persons or objects for theater stages or the like has a two-part traveling carriage. The two traveling carriage parts (1 and 2) are connected by lattice girders 3 to form one unit. Elevating platforms 4 of different sizes can be suspended on the cable winches of the traveling carriage parts. The winch frames 9 are telescopic 10. The lowering device is consequently variable in terms of the size of its elevating platform and the lifting height. The modular concept permits easy transportation in the form of individual parts and simple set-up of the lowering device.

Abstract: A lifting apparatus having a base, a platform disposed above the base, and a vertically extendable mast arrangement coupled between the platform and base to effect vertical lifting of the platform. The mast arrangement normally includes a pair of vertically extendable mast assemblies disposed in parallel relationship, and each having plural vertically elongate masts disposed in vertical sliding relationship with one another. One mast is fixed to and projects upwardly from the base, another is fixed to the platform, and at least one additional mast is vertically slidably coupled therebetween. Each mast has sequencing structure associated therewith for requiring that the individual masts be vertically extended in a controlled sequence, and also has a locking structure for vertically fixedly coupling adjacent masts together when one is vertically extended relative to the adjacent mast.

Abstract: The mobile scaffolding unit has a tower, a work platform and a service platform. The work platform can be resupplied by the service platform so as to maintain the work platform at a working elevation. The work and service platforms are located on the vertically orientated tower. Each platform is provided with electric motors to propel the platforms along the tower. The service platform is located below the work platform. The work platform has hatches in its deck for receiving cargo. The hatches are covered with doors. Cargo is located on raised platforms on the deck of the service platform. The service platform then moves up the tower to a position immediately beneath the work platform. The cargo is received by the hatches on the work platform as the service platform moves up the tower, wherein when the service platform is immediately below the work platform, the cargo is at the same level as the work platform deck. The cargo is then moved onto the work platform deck.