Abstract: A platform car includes a base frame, a platform, and two X-shaped members respectively disposed along both sides of the base frame. Each X-shaped member is comprised of a first bar having a first end pivotally attached to the base frame and a second end slidably received in an associated groove in the platform and a second bar pivotally connected to the first bar at a middle portion thereof with a first end thereof pivotally attached to the platform and a second end thereof slidably received in an associated groove in the base frame. A handle is mounted on the base frame for manually operating a piston rod of a cylinder. An actuating member is securely attached to and actuatable by the piston rod. A pair of connecting members each with a first end thereof pivotally attached to the actuating member and a second end thereof securely attached to a lower part of associated first bar of the X-shaped member.

Abstract: This invention relates to a lift device adapted to transfer wheelchair passengers to commuter aircraft. A base and optional four post system provide support for a vertically moveable platform. An apron, which can be used either as a ramp from lowered platform to ground or a bridge from elevated platform to aircraft is provided. The platform is preferably raised and lowered using ball or acme screw-bushing brackets. The platform can be used to load and unload passengers from rear and front door commuter aircraft, on either side of the fuselage. The lift can be incorporated into a wheeled chassis, which can be lowered into ground contact at the position of use. Optionally extendible stairs are present to allow other passengers to enter or leave the aircraft using said platform and apron.

Abstract: A system for servicing and maintaining an aircraft includes a fuselage dock assembly having a first ground-supported column, a second ground-supported column and a walkway section supported by the first and second columns. The system also includes a tail dock assembly having a recess defined therein for receiving a tail section of an aircraft, and an engine stand for servicing an engine of the aircraft that is not readily accessible from the fuselage dock assembly or the tail dock assembly. Structure is also provided for adjusting the height and inclination of the walkway section relative to a horizontal plane, so that the walkway section will conform to the natural inclination of a particular aircraft. The system includes serveral other novel and advantageous features for increasing the safety and efficiency of aircraft maintenance.

Abstract: A self-storing maintenance stand for a scissor lift aerial work platform wherein a pair of arms are freely pivoted on each side of a stack of pivotally connected scissor arms at the medial portion thereof. An arcuate saddle plate is provided on each end of the pair of arms for engaging protruding end portions of the pivot pins of the next adjacent scissor arms. A weight is connected to the end portion of one of the arms so that the arms will freely pivot to a non-working or stored position.

Abstract: An adjustable ladder comprising, a pair of side supports, a device for retaining the supports in a spaced relationship, a rung, a device for slidably mounting the rungs in the supports, and a device for moving the rung along the supports for adjusting the position of the rung.

Abstract: An apparatus wherein a base plate mounts a plurality of base plate tubes, each mounting stabilizer legs, wherein the stabilizer legs are provided to include leveling screws to provide leveling of the associated apparatus relative to an underlying support surface. A guide track including a gear rack is arranged to cooperate with a drive gear structure rotatable by use of a reversing electric motor to effect raising and lifting of an associated platform in cooperation with the drive gear structure with the gear rack. An extension guide track, including an extension gear rack, is arranged to be affixed longitudinally aligned with the gear rack structure to effect extension of effective length for raising and lowering of the associated platform.

Abstract: A lifting apparatus capable of eliminating a synchronous mechanism or an additional hydraulic cylinder with simple structure. The lifting apparatus comprises a mobile chassis, a platform disposed over the mobile chassis and capable of raising and lowering vertrically, and a lifting mechanism disposed between the mobile chassis and the platform and including a pair of hydraulic stretchable mechanisms connected to each other at the central portions thereof and capable of turning in an X-shape about the central portions thereof and stretchable in three stages.

Abstract: A telescopic boom and lift apparatus positions a vertical support and platform and includes a telescopic boom unit and a rigid mechanical lift linkage to pivot the boom unit with automatic leveling of the support. The telescopic boom unit is pivoted to a base, with a motor unit coupled to extend and retract the boom unit. A rigid linkage unit is pivotally interconnected to the base and the tip boom of the boom unit. The linkage unit is constructed and arranged to support the boom unit in the retracted, collapsed position and to exert a lifting and pivot force on the boom unit in response to extension of the tip boom. Parallelogram linkages on the boom unit and lift unit are coupled to a pivot unit at the tip boom and maintains a precise orientation of the vertical support and platform. The lift arm unit includes parallel rigid arms which are laterally spaced such that the boom unit collapses into the lift unit to form a compact assembly.

Abstract: A synchronization device for an articulated parallelogram boom assembly having a floating frame connected between an upper work platform carrying boom assembly, and a lower vehicle mounted boom assembly. The synchronization device is mounted on the floating frame and includes a slidable member and compression and tension links connected between the slidable member and the upper and lower boom assemblies. The synchronization device is constructed and arranged to maintain the included angles of the adjacent upper and lower boom assemblies substantially identical during the luffing movement of the boom assemblies so that the work platform is maintained parallel to the ground plane.

Abstract: The present invention is directed to an offshore access system that includes a support frame designed to be supported by grating positioned above horizontal structural members of the offshore structure. A support sleeve is attached to the support frame. Within the support sleeve there is included a vertically slidable and rotatable post. A mobile works platform is attached to a lower end of the vertically slidable and rotatable post. The work platform has a U-shaped configuration in one embodiment to provide maximum access to vertical structural members.

Abstract: An improved scaffold system suitable for tunnel roofing and siding, and other applications above and below the ground is disclosed. This invention is a diesel powered, hydraulically actuated, mobile and adjustable scaffold system that an operator can drive into a work area, such as a tunnel. Once at the work area, the operator can address the work face head on, and can adjust the workpiece carried on the work bearing surface of the system in every possible dimension.This invention compries a self-powered vehicle assembly and a multi-table assembly. The vehicle assembly provides a general level of mobility and maneuverability to the entire system. The multi-table assembly mounted on top of the vehicle assembly includes several movable tables, the top one of which supports a work bearing surface.

Abstract: Device for the curved displacement of an object in contact with a surface, such as a convex, concave or complex surface, comprising a vertical support frame, arranged in the vicinity of the surface, and a bearing arm consisting of at least one pantograph, one end of which, integral with the vertical support frame, can be displaced over the height of the latter, and the other end of which carries the object to be displaced at an appropriate distance from, and out of contact with, the surface, wherein at least one of the hinge pins of the arm of the pantograph is displaced, with the movement of the arm relative to the frame, in a groove whose profile is homothetic with that of the surface, and situated in a vertical plane containing the pantograph arm.

Abstract: A hunter's blind having hinged walls which may be fastened together when in a vertical position and compactly stored when in a horizontal position, a connecting roof, ball rollers cooperating with openings in leg sections to raise and lower the hunter's blind, stabilizing cables being payed out and taken up simultaneously with the raising and lowerig of the hunter's blind, and controls located within the hunter's blind to enable the user to control the raising and lowering of the hunter's blind and the deployment of the stabilizing cables while remaining within the blind.

Abstract: A lifting apparatus having a least one set of paired stretchable boom assemblies which extend and contract, preferably in five stages. The boom assemblies are disposed between a chassis and a platform for raising and lowering the platform in interlocking relation with an operating mechanism, a guiding mechanism and a synchronizing mechanism. The lifting apparatus further includes a kick mechanism for auxiliarily supporting the load on the platform at a position where the platform is lowered about halfway. The kick mechanism has one end fixed to the chassis and the other end provided with a kick body capable of supporting the centers of the boom assemblies and provided with a detecting means for detecting contact between the boom assemblies and the kick mechanism.

Abstract: A ruggedly constructed work cart particularly suitable for use by mechanics includes a center work platform which is selectively heightwise adjustable. A series of platforms positionable at different heights allow the cart to function as a ladder, while a removable handle is provided so that the cart can be positioned beneath a vehicle for the purpose of supporting heavy parts. A removable tool tray can be alternatively attached to a vehicle`s bumper or tire to provide a mechanic with a "step" to gain better access to a vehicle's engine compartment.

Abstract: The combination 10 of a foot restraint platform 12 designed primarily for use by an astronaut being rigidly and permanently attached to an end effector 14 which is suitable for attachment to the manipulator arm 16 of a remote manipulating system. The foot restraint platform, is attached by a brace 36 to the end effector 14 at a location away from the grappling interface of the end effector. The platform comprises a support plate 18 provided with a pair of stirrups 21,22 for receiving the toe portion of an astronaut's boots when standing on the platform and a pair of heel retainers 23,24 in the form of raised members which are fixed to the surface of the platform and located to provide abutment surfaces for abutting engagement with the heels of the astronaut's boots when his toes are in the stirrups. The heel retainers 23,24 preclude a backward sliding movement of the feet on the platform and instead require a lifting of the heels in order to extract the feet.

Abstract: An extension and retraction system for a four section telescopic boom having simultaneous and equal extension and retraction of the telescopic sections, wherein a pair of hydraulic cylinders are mounted exteriorly of the boom for extending and retracting the inner mid section relative to the base section; a pair of extension chains or cables are connected between the base section and the outer mid section, and between the fly section and the inner mid section; and a pair of retraction cables are connected between the base section and the outer mid section, and between the fly section and the inner mid section. The extension and retraction chains and cables are positioned within the boom sections to thereby be protected from damage.

Abstract: An elevating stage that can be raised by a power drive comprises scissor beams of lifting scissors which are bent in the middle at an upward pointing angle of bend. The moving joints of the scissor beams are offset laterally within respect to one another in such a manner that the scissor beams lie one on top of the other and the sides of the scissor diamonds generated when the lifting scissors are extended out have different lengths.

Abstract: A power-operated lift and presenting mechanism is disclosed which lifts an article stored on a platform member in a vehicle trunk to an upwardly lifted position. A start assist member is included to assist in the initial movement of the platform member from a lowered stored position to the upwardly lifted position. The platform member is forced upwardly at two locations when it initially begins to move. The motor has a short period of time to warm up before it begins lifting the platform member. The lift and presenting mechanism is incorporated into controls for vehicle, such that when a trunk opening switch within the vehicle cab is actuated, the lift and presenting mechanism is automatically actuated to drive the platform member to an upwardly lifted position. A switch is placed in an easily accessible position within the vehicle trunk and includes a kill switch to disconnect the automatic actuation.

Abstract: A vertically movable safety railing system for providing a safety railing enclosed area on top of mobile equipment such as railroad tank cars, tank trucks, and the like, characterized by an elevated stationary platform and a safety railing assembly mounted relative to the platform. The safety railing assembly includes a vertically movable mast, a cantilever arm attached to the mast, a vertical movement unit and an open-bottomed safety railing cage secured to the arm. The vertical movement unit includes either a pneumatic or electric motor operated jack, or alternatively a hydraulic piston-cylinder assembly. These vertical movement units act as means for vertically moving the mast relative to the structural member or platform between an elevated position where the safety railing cage is elevated above the mobile equipment and a lower position where the safety railing frame substantially contacts the equipment, enclosing a portion of the top of the equipment to provide a safety railing enclosed area.

Abstract: A mechanism for automatically preventing a motor vehicle from dropping from a wheels support plate of a lifting apparatus of a system for lifting the vehicle for repair thereof comprises (i) a barrier wall connected to one end portion of the support plate along a width direction thereof for pivotal movement between a vertical position and a horizontal position which is on the support plate, (b) positioner for maintaining the barrier wall in the vertical position when the support plate is not in a lowest position, so that if a motor vehicle driven onto the support plate from a direction opposite to said one end portion of the support plate and supported thereon should accidentally move forward, the barrier wall engages a front wheel of the vehicle to prevent the vehicle from dropping from said one end portion of the support plate, and (c) leveler which brings the barrier wall down to the horizontal position when the support plate has been moved to a lowest position.

Abstract: A lifting carriage having a rectangular frame provided with four corner posts for guiding an elevating platform mounted between these posts. Each post has a toothed rack on which a toothed gear mounted on the platform is engaged for raising the platform. The toothed gears ar actuated by a motor mounted on the platform through a power chain. The carriage is mounted on wheels which can be actuated by a motor for horizontally moving the carriage. The carriage is also provided with spinning wheels on its side, whereby, the carriage, when tilted on its side, can be moved sideways. The elevating platform is provided with guiding wheels adapted to abut against the corner posts for allowing a smooth sliding of the elevating platform.

Abstract: A perimeter debris net lifting system employs a plurality of lifting units which support a debris net for a high rise-type construction structure. The lifting units comprise a pair of frame assemblies which are slidably coupled and essentially scale the structure to raise the debris net as construction progresses. Each of the frame assemblies are independently mountable to two floors of the structure. Each lifting unit is vertically displaced by disengaging one of the frame assemblies from its mounting engagement and lifting the frame assembly while the other frame assembly remains securely fixed to the structure. The debris net remains fully extended and functional during the vertical lifting process. The lifting units may also mount one or more scaffolding frames and a vertical debris net.

Abstract: The invention provides an elevating apparatus for raising and lowering a work station holding personnel, equipment, and/or materials between a downward declining, compact retracted position and an upwardly inclining extended limit position. The work station is connected to a mobile support base by parallelogram first and second boom assemblies which are operatively interconnected by a boom assembly coupler and rigid compression link. Thus, raising or lowering the first boom assembly by hydraulic lift means causes the second boom assembly to move correspondingly such that the work station moves vertically, unaccompanied by any substantial horizontal motion, and is maintained in a level attitude throughout the range of motion of the apparatus.

Abstract: This disclosure relates to an elevator system for use in a multi-story building, the building having a vertical space formed therein. The elevator system comprises a stationary framework adapted to be mounted in the space, the framework comprising frame members dividing the vertical space into a plurality of angularly spaced sectors. At least one elevator cage is mounted each of the sectors. At least one turntable is rotatably mounted in the space adjacent the stationary framework, the turntable being located to receive a cage from the stationary framework and rotate the cage from one of the sectors to another of the sectors. A power drive on the frame members, the turntable and on each cage is provided for moving each cage in the vertical direction.

Abstract: Pneumatic operated scaffolding is presented and includes a plurality of fluid operated cylinders to lift sheetrock or the like for ceiling joist attachment. The scaffolding includes a removable walk and adjustable legs for use in a variety of construction applications. Transverse braces having multiple joints, a removable work support frame, along with pivotable pneumatic cylinders allow the scaffolding to easily fold for compact storage and transportation purposes.

Abstract: A scissors lift apparatus having a wheeled tube chassis and a platform connected together by one or more scissors arm assemblies, each scissors arm assembly including a center arm and two outside support arms pivotally connected at their longitudinal midpoint, adjacent scissors arm assemblies connected in series at the ends of the center arms and at the ends of the outside support arms, a hydraulic cylinder pivotally connected to the chassis and pivotally connected to the pivot axis of the lowermost scissors arm assembly, the pivot connection between adjacent outside support arms comprising common castings, each casting having a pair of longitudinally extending, longitudinally offset ears, the ears of one casting engaged and pinned with the ears of a second axially rotated casting.

Abstract: A lift which can, for example, be used for lifting a container onto a truck, or for lowering it, includes a horizontal base equipped with wheels and capable of being raised above a floor and thereby supported on the wheels so that the lift as a whole may be moved, while the base can otherwise rest on the floor. A horizontal frame is mounted on the base and has a horizontally projecting portion, and a scissors jack is provided on the frame. A horizontal container-carrying table is supported vertically movably on the jack and has a horizontally projecting portion lying above the projecting portion of the frame. The table is provided along a pair of longitudinal edges with a pair of wheel guide grooves. The lift includes a mechanism associated with the base and the wheels for raising and lowering the base, and a mechanism connected between the jack and the table for opening and closing the jack to move the table vertically.

Abstract: The portable lift of the present invention includes a forward lift frame and a rear lift frame adapted to be connected to the forward and rear ends of the vehicle. Each of the lift frames includes a vertical tube or mast assembly having at least two telescopically extensible tube sections. Hydraulic extensible cylinders are within the tube assemblies of the forward and rear lift frames for causing the raising and lowering of the forward and rear lift frames between retracted and extended positions. An elongated support platform is pivotally connected to the upper ends of the tube lift assembly and is adapted to be raised and lowered in unison therewith.

Abstract: An elevating device for a workman's platform in which a single lift cylinder is utilized, positioned below the lift arms when the arms are in their fully retracted or lowered position. A piston of the cylinder is operatively connected to one of the lift arms, with the opposite end of the cylinder being operatively connected to one end of a pivot arm assembly which is mounted for rotation about a fixed axis on the base. The opposite end of the pivot arm assembly carries a roller which is adapted to engage the cam surface of a cam plate mounted on the same lift arm. When the lift cylinder is actuated, the piston functions to raise the lift arm at its connection point to the piston, simultaneously with the rotation of the pivot arm assembly and the consequent lifting of the cam roller against the cam surface thereby elevating the arm at that location as well.

Abstract: An emergency escape/fire fighting and building maintenance system including columns mounted to the exterior of a building for guiding either an escape slider or a fireman or maintenance lift. Each column has an inner and outer face which either assists in controlling the rate of descent of the escape slider or provides a means for allowing a fireman's lift or maintenance lift to climb the columns. The slider includes a harness and a body member which is engageable with and slidable down the column. The body member includes brake pad surfaces to provide an automatic braking system in the event the user is unable to maintain the desired escape posture and control his descending speed. Manual braking system is added to the alternate slider designs. The slider is intended to be used by able bodied persons since its descending speed is in part to be controlled by the user himself.

Abstract: An infant incubator mattress positioning assembly having a pair of lift mechanisms spaced apart on the deck of the incubator. Each lift mechanism includes a scissor linkage which is operated by a lead screw mechanism. The mattress tray, positioned on the free ends of the links of the scissor linkages, is moved by turning a crank in the lead screw mechanism of each lift mechanism.

Abstract: A mobile scaffolding system having a substantial rectangular rolling base which supports pump jack poles on which rides up and down pump jacks across which a platform is supported. The poles are supported by extensible supports when moved to a desired location and when a user mounts the platform, the poles extend downward to lock onto the support surface stabilizing the base and preventing further movement of the base.

Abstract: A safety railing assembly for a platform comprises a plurality of railing modules each having two upright post portions and at least one horizontal hand rail portion interconnected between the post portions. A plurality of mounting means are provided for supporting the modules along the periphery of the platform, the mounting means for each module comprising at least first and second clamps adapted to be slideably positioned along the fastened to the platform. The clamps have post receiving apertures shaped to receive and retain the posts in upright orientation. A substantially planar safety panel is coupled to the post and hand rail portions of each module for substantially enclosing a planar area defined by the post and hand rail portions and the platform. Fixed or rotatable end gate safety railing modules may also be provided.

Abstract: An aerial lift includes a bucket mounted at the outer end of an articulated boom assembly having upper and lower booms. A hydraulic cylinder is provided for extending the upper boom relative to the lower boom, and a rotary actuator is provided for varying the rotational position of the bucket relative to the upper boom. An auxiliary cylinder, actuated in response to actuation of the upper boom hydraulic cylinder, provides hydraulic fluid to the rotary actuator so as to maintain the bucket in a substantially level position as the articulated boom assembly is raised and lowered. The load train including a chain and sector-shaped sprocket automatically compensate upper boom angle for changes in the angle of the lower boom relative to horizontal so that the rotary actuator is actuated only in response to actual changes in the angular position of the upper boom relative to horizontal.

Abstract: A system for lifting a vehicle for repair thereof has a pair of parallel pits which are made in a floor and connected to each other by a passage. A rotatable support rod extends through the entire length of said passage and projects into both of the pits. A pair of scissors jacks are supported in the respective pits. Each scissors jack includes a pair of parallel vertically-extensible double-scissors constructions. The double-scissors constructions can be retracted or folded into the associated pit. Each double-scissors construction comprises a pair of upper and lower vertically-extensible X-shaped elements pivotally connected to each other. Each X-shaped element includes a pair of links pivotally connected to each other in the alphabetical letter "X". One of the links of the lower X-shaped element has a lower end fixed to the support rod, so that all the four double-scissors constructions of the two scissors jacks are connected to the common support rod.

Abstract: Individual rail segments of a deployable exterior elevator rail structure are stored horizontally on each floor of a high-rise building. When actuated from a ground level control panel, closure panels swing aside to provide access openings through which linear actuators translate and rotate the rail segments to a vertical deployed position. Motor driven threaded bolts automatically secure the ends of adjacent rail segments together, and the linear actuators rigidly brace the deployed rail structure in front of the face of the building.

Abstract: A traversing elevator is provided comprising a cabin (1) moving over a supporting structure (3) astride a traffic way (9) and clearing an obstacle (12). Movement of the cabin is provided by means of roller trollys (17) and lower rollers (21) fixed to the cabin and running over supporting rails. The cabin is held horizontal all along its travel path.

Abstract: The elevator car is guided in its movement through the hoistway by the two conventional guide rails positioned one on each side of the car, and also by a third guide rail positioned on one side of the car adjacent one of the car doors. The blade of the third guide rail is parallel to the sides of the car, and is engaged by a pair of guide rolls which are mounted on a beam extending out from under the car floor. The third guide rail is mounted in the hoistway on the bracket beams which secure the counterweight guide rails in place. The purpose of the third guide rail is to prevent lateral oscillation of the car as it moves through the hoistway.

Abstract: To guide and restrain essential hoses and cables of telescoping boom machines, a carrier track system for the hoses and cables is provided in which all parts of the flexible carrier track are supported during extension and retraction of the telescoping boom. The system includes a stiff leg attached to the forward end of the boom fly section and extending rearwardly thereof and engaging a guiding and restraining device on the forward end of a carrier track bridge attached to the forward end of the boom mid-section and extending rearwardly thereof and engaging a restraining and guiding device on the forward end of the boom base section. The rear of the bridge carries a guide roller assembly which engages the bight portion of the flexible carrier track which is connected between the stiff leg and the forward end of the boom base section. Spaced support rollers on the top of the bridge engage and support the stiff leg and the top stretch of the flexible carrier track along its entire length.

Abstract: An apparatus for retaining the attitude of a platform on an articulated boom is provided. The apparatus includes master-slave piston cylinders for adjusting the attitude of the platform relative to a reference object. The apparatus further includes a pivot plate defining a triangle having first, second, and third mounting locations with a platform being pivotally mounted to the pivot plates at one mounting location. A piston cylinder is pivotally connected to the pivot plates at a second mounting location and is operatably connected to the platform. A pivot means is pivotally connected to the pivot plate at the third mounting location and, at its other end, is connected to the fixed support about which the articulating boom rotates. Rotation of the articulating boom results in the pivot means pivoting the pivot plate in such a way that the platform is maintained at its preset orientation.

Abstract: Apparatus having telescoping box-like cage sections and capable of raising a person or object to a desired height and solidly supporting same at such height, the relative movement of the sections being guided by pre-loaded rollers bearing against vertical guide surfaces provided by the flanges of angle iron members forming the vertical edges of the cage sections. A method is disclosed for assembling the apparatus with the rollers pre-loaded against the cooperating guide surfaces by clamping the angle iron members of the outer cage inwardly before connecting them with cross members under tension.

Abstract: An elevating apparatus including a base, a platform, at least a pair of pivotally interconnected boom assemblies connecting the base and the platform together, the pair of boom assemblies including a pair of hollow middle booms pivotally interconnected substantially centrally thereof by a shaft, and upper and lower booms telescopically disposed in each of the middle booms and movable out of upper and lower ends of the middle booms, the lower booms having ends pivotally mounted on the base in spaced relation and the upper booms having ends pivotally mounted on the platform in spaced relation, each of the boom assemblies including a synchronizer for synchronizing intervals of extension of the upper and lower booms from the middle boom, a pair of hydraulic mechanisms operatively coupled between the shaft and the base at spaced locations thereon for moving the middle booms to displace the upper and lower booms into and out of the middle booms to lift and lower the platform, and a controller for selectively contro

Abstract: An energy-recycling scissors lift includes a platform, base and a pair of scissors linkages, each having a first and second scissors legs. One end of each second scissors leg is pivotally attached to the base and the other end translations along the platform. One end of each first scissors leg is pivotally attached to the platform and the other end translates along the base. A bridge structure connects each of the second scissors legs together. A sealed gas cylinder, attached to the base and the bridge structure, moves the platform to an extended position above the base. Energy is stored in the sealed gas cylinder as the platform and supported object descends to a retracted position. A compensating device is attached to the scissors lift to compensate for the overforce caused by the sealed gas cylinder. One form of the compensating device adjusts the position of the sealed gas cylinder to vary the force exerted on the platform. Other compensating devices are equalizing springs and spring reels.

Abstract: An aircraft loader has an elevatable deck supported on scissor-type supports and urged into the elevated position by a hydraulically actuated lifting structure. The lifting structure incorporates two supports that move vertically on chain members when the cylinders are actuated.

Abstract: A portable lift for the bench frame of a vehicle measuring, bending and aligning system with two pairs of pivotally interconnected arms driven by a pair of fluid actuated cylinders, all of which are carried by a base and when fully lowered received between longitudinal rails of the bench frame. Preferably, the lift is operated by a portable and remote power and control unit. Preferably, when raised, the lift is prevented from suddenly dropping to the fully lowered position in the event of a failure or malfunction of the drive cylinders or power unit by a catch mechanism disposed between the arms of the lift.

Abstract: An escape system for buildings which is comprised of at least one vertically disposed runner positioned preferably on the exterior of a building adapted to engage and support a removable power driven platform carriage which moves from floor to floor receiving trapped persons and delivering the same to safety levels. The driving power can be mechanical, electrical, manual, or combinations of thereof.

Abstract: A pedestal scaffold type having a base member, a telescopic mast mounted vertically on the base member and a work cage mounted in cantilever manner from the upper end of the mast. The majority of the nested tubular mast sections are of rectangular cross-section and are formed of thin-walled sheet aluminum with rounded corners and vertical stiffening ribs on each side thereof extending the height thereof. Plastic slide blocks at the inner corners of the upper end and at the outer corners of the lower end of the mast section distribute the forces between the sections to relatively large areas of the aluminum sheet which forms the mast sections.

Abstract: The present invention relates to a scaffold for working under the stern of vessels for servicing propellers, propeller shafts, stern tubes, rudders and the like. The scaffold comprises a movable carriage to which is mounted a vertical support including actuating elements for raising or lowering a longitudinal platform at the upper part of the support. A further actuating element is used for longitudinally displacing the platform so as to reach the vessel parts to be serviced.

Abstract: An aerial platform attachment for a crane having an extensible boom including a basket pivotally suspended from the boom tip. A loop on the bucket is engaged by a projection secured to the boom when the bucket is pivoted adjacent the boom and the boom is then fully retracted. A brake which is applied by a hand lever movable in either direction from a central release position locks the bucket relative to the boom when in a working position.