Abstract: In a worker management system comprising a terminal device, a worker detection system, and a site management device, the terminal device transmits a worker signal, which includes terminal GNSS positional information represented by a GNSS coordinate system of the terminal device, to the site management device. The worker detection system transmits worker detected positional information, which indicates a position of the worker detected by a surrounding monitoring sensor mounted on the work machine, to the site management device. The site management device relates the terminal GNSS positional information to the worker detected positional information, and when both information for the same worker is available, it selects a position indicated by the worker detected positional information, and when only the terminal GNSS positional information is available, it selects a position indicated by the terminal GNSS positional information, as a current position of the worker.

Abstract: The invention relates to a vehicle (1), in particular a truck-mounted concrete pump, having a pivotable turntable (3), arranged on a frame (2), with a boom (4) constructed thereon, and a frame outrigger (5) which has carriers (6, 6a) that are retractable into the vehicle profile and/or extendable out of the vehicle profile, wherein the carriers (6, 6a) are each guided on an extension portion (7, 7a) fixed to the vehicle and form a telescope (8, 8a) therewith, wherein the extension portions (7, 7a) fixed to the vehicle are arranged behind a cab (9) in the direction of travel, wherein a folding part (11, 11a) connected via a joint (10, 10a) is arranged in each case at a free end of the carriers (6, 6a), wherein a support leg (12, 12a) is arranged on each folding part (11, 11 a), wherein the joint (10, 10a) is arranged outside the respective extension portion (7, 7a) in the retracted transport position of the carriers (6, 6a), such that the folding part (11, 11a) is foldable laterally into the vehicle profile in

Abstract: A ladder support assembly including a base frame having first and second ends and a pair of pivot supports extending from the base frame which support a rod configured to pivotally support a ladder relative to the base frame. A pivot frame is pivotally mounted to the base frame and is biased away from the base frame. A bracket assembly is pivotally mounted to the pivot frame and includes a pair of bracket plates. Each bracket plate has an inner flange and outer flange with a ladder rail receiving area between the inner and outer flanges. The ladder receiving area is configured such that the bracket plate is slidable relative to a respective ladder rail received therein. A crank assembly includes a spool rotatably supported on the base frame and a cord wound about the spool with a free end of the cord connected relative to the pivot frame.

Abstract: A quint configuration fire apparatus includes a ladder assembly and a single rear axle coupled to a chassis. The single rear axle includes either a single solid axle configuration extending laterally across the chassis or a first axle having a first constant velocity joint and a second axle having a second constant velocity joint. The ladder assembly is extensible to provide a horizontal reach of at least 90 feet and a vertical height of at least 95 feet and configured to support a tip load of at least 750 pounds. A water tank is configured to contain at least 500 gallons of water. The center of gravity of at least one of the chassis, a body assembly, a pump, and the water tank are positioned to counterbalance a moment generated by the tip load with the ladder assembly extended to the horizontal reach of at least 90 feet.

Abstract: A vehicle and method for tending to an elevated livestock cage includes a support frame, a base, a drive unit, and an elevated platform. The support frame extends upward from the base, and the drive unit is operatively attached to the base for moving the base along the aisle. The elevated platform is affixed to the support frame and is positioned above the base at a height suitable to facilitate access to the elevated livestock cage. The support frame and the elevated platform are configured to support an operator while moving the operator along an aisle of a confinement facility.

Abstract: A picking ladder cart with a synchronized brake is provided, which includes a frame, a plurality of wheels, a ladder, and a stopper. The ladder is pivotally connected to a side of the frame, wherein the ladder is pivotally movable between a first position and a second position. The ladder includes two side rails and a plurality of steps, which are connected between the two side rails. The stopper has a first end and, a second end. When the ladder is moved to the second position, one of the plurality of steps, which is arranged at the lowest position among the steps, abuts against the second end of the stopper, which causes the stopper to contact one of the wheels. When an operator steps on the ladder of the picking ladder cart, the lowest step drives the stopper to abut against one of the wheels.

Abstract: An apparatus and method are disclosed for servicing a vehicle, such as an airplane. The apparatus includes a mobile maintenance platform configured to position in proximity to the airplane and airplane components such as the engine and the fuselage. A cantilever deck provides a slip resistant surface to work on. A gap on the edge of the deck enables the deck to position near the airplane component. Clamps on either side of the gap apply sufficient force to stabilize the component and also serve to close the gap completely, forming a flat surface across. A railing acts as a barrier on the edge of the deck. A frame supports the deck. Adjustable legs support the frame. A jack raises and lowers the legs to regulate elevation of the deck. A tow hitch enables the apparatus to be moved. An adjustable ladder provides access to the deck.

Abstract: Fall restraint equipment comprising a mobile access unit having a mobile platform portion, a ladder portion, and a cage portion. The components of the fall restraint equipment are formed from butterflying, lasering, cutting, bending, and/or stamping continuous pieces of tubular and sheet metal. The components of the mobile access unit are modular and include adapters of varying height that cause the mobile access unit to exhibit varying height.

Abstract: The disclosed adjustable ladder support mechanism solves the problem of unstable extension ladders with a mobile base that can be moved by one man, the base then expanded in both length and width. With the stable base set up, the ladder can be extended, the angle adjusted, and the operator can safely climb the ladder. Worries of the ladder slipping sideways off the ledge against which it is leaned are eliminated. The adjustable ladder support mechanism has two main sections: the base, which provides stability, and the tower, which raises the ladder above the ground.

Abstract: An outrigger is disclosed for stabilizing a wheeled vehicle having an extensible service equipment mounted to a chassis thereof. The outrigger is deployable between a stowed and a deployed position where a foot of a telescopic leg assembly comes into contact with the ground thus stabilizing the vehicle. The telescopic leg assembly is mounted to the chassis of the vehicle such that travel of the foot is initially in a horizontal direction with no downward component followed subsequently by travel in a substantially vertical direction with limited horizontal movement such that when the foot comes into contact with the ground, lateral forces are limited. There is also disclosed a stabilized wheeled vehicle comprising opposed pairs of outriggers.

Abstract: A carriage assembly includes a carriage frame, a caster, and a first jack body coupled to the carriage frame and the caster. The first jack body has a longitudinal axis. The first jack body is configured to selectively move the caster with respect to the carriage frame along the longitudinal axis.

Abstract: A scaffold system includes first and second spaced apart vertical posts. An upper support device mounts at an upper portion of each of the first and second vertical posts and includes spaced apart arms extending in a first direction from the associated vertical post for engaging the side of a building. A lower support device mounts at a lower portion at each of the vertical posts to support one or more planks and includes outriggers extending laterally and in a second direction opposite the first direction. The outriggers include a wheel mounted near an extended end of each of the outriggers to provide for rolling the system to a worksite. The outriggers may be vertically adjusted and combined in multiple combinations and with multiple arm configurations to adapt to uneven terrain.

Abstract: A modular ladder comprises a base having a back end and a front end. A vertical support is attachable to the back end of the base. The ladder also includes a stair section assembly comprising a plurality of steps. The stair section assembly has a front end and a back end. The front end of the stair section assembly is attachable to the front end of the base. The back end of the stair section assembly is attachable to the vertical support. The stair section assembly comprises a separate top step, whereby the top step is capable of being attached to the stair section and whereby the attachable nature of separate top step facilitates storing the ladder in a compact container which is smaller than the stair section and top step when placed in an assembled condition. A method of storing the ladder in a compact container is also disclosed.

Abstract: A novel lockstep mechanism for a rolling ladder is described. The weight-releasing ladder lockstep allows a ladder to be relocated on wheels but when a person climbs the ladder, the front wheels are automatically retracted and the ladder rests firmly with its front feet on the floor. When in the climbing (stationary) position the front wheels of the lockstep are retracted and the ladder rests on the lockstep's feet. When in the rolling position, the ladder is tilted slightly back on its rear wheels and the wheels of the lockstep are pushed down to allow the ladder to roll. When in the rolling position, the lockstep wheels are held in place via a latch which is isolated from rolling vibrations through pivoting shock links and springs.

Abstract: A wheeled platform for supporting a stepladder includes an adjustable size frame carrying a plurality of swivelable and rotatable wheels for movably interengaging an underlying surface. The frame includes a plurality of adjustable mounting brackets that are releasably interconnectable to respective legs of a stepladder for holding the stepladder in an open condition on the frame. A brake is provided for selectively engaging at least one of the wheels to brake and hold the frame in a selected location on the underlying surface.

Abstract: The present invention relates generally to ladders and more specifically to auxiliary stands or supports for utilization with ladders where it is not possible or desirable to rest the top of the ladder legs against a vertical surface or roof edge guttering for support and the required work height is beyond the reach of a conventional step ladder.

Abstract: A rolling or skidding platform ladder 1 is provided that has a platform ladder part 3 and an undercarriage part 5. The undercarriage part 5 carries ground engaging parts 21 to enable rolling or skidding of the ladder 1. The platform ladder part 3 has legs 7/9 which are raisable with the platform ladder part 3 to elevate the bottom of the legs 7/9 spaced from the ground when the platform ladder 1 is to be rolled or skidded. The undercarriage part 5 comprises a lever arm 29 that is pivoted thereto in a see-saw manner so as to extend generally parallel with the ground. One end of the lever arm 29 is for co-operating with the ladder part 3 to raise at least two legs of the ladder part 3 relative to the undercarriage part 5 so that the rolling ladder 1 can then be rolled or skidded without the at least two raised legs engaging the ground.

Abstract: A mobile scaffold (10) having bi-axially rotatable casters (22–28) and including brake assemblies (30 and 32) associated with the casters (22–28) is disclosed. The inventive brake assemblies (30,32) enable an elevated worker to selectively control the mobility of the scaffold (10) and each broadly includes shiftable brake stop subassemblies (74 and 76), a brake housing (72) adjustably connected to a respective scaffold frame (12,14) and shiftably connected to the brake stop subassemblies (74,76), and an actuator (78) adjustably connected to the housing (72) and configured to shift the brake stop subassemblies (74,76) into and out of braking positions. When in the braking position, the brake stop subassemblies (74,76) prevent the respective casters (22–28) from rotating about both axes. The actuator includes cables (180,182) for interconnecting brake stop subassembly and the handle in one embodiment and a plunger (308,406) in other embodiments.

Abstract: A safety ladder stand comprising a generally rectangular base having a front and rear and a center beam, a plurality of stair treads extending upward from the front of said base and means for supporting said stair treads secured to said base, front wheels mounted at the front of said base and beneath the top of said stair treads; center wheels mounted on said center beam of said base, and rear wheels mounted at the rear of said base, and a set of feet mounted on the front of said base; wherein said ladder stand has an activated position wherein said front and center wheel sets are in contact with the ground to enable said ladder stand to roll and said rear wheels and front support feet are not in contact with the ground, as well as a deactivated position wherein the front and center wheel sets are not in contact with the ground and said rear wheels and front support feet are in contact with the ground to prevent said ladder stand from being rolled; and means for moving said ladder stand from said deactivated

Abstract: The adjustable height workhorse is a height adjustable workspace for allowing a worker to easily hang sheet rock on walls at elevated heights. The workhorse provides a platform supported by a frame having a plurality of vertical posts and a plurality of horizontal height adjustment bars. The frame is positioned on a base board. A plurality of wheels is disposed underneath of the base board. The wheels allow the workhorse to be repositioned while the worker is on the platform. The height adjustment bars are mounted on either side of the frame. The bars are positioned at varying heights so that the worker may adjust the height of the platform. The platform is disposed across the frame and is supported by the height adjusting bars. The platform is of suitable size to support a worker and the worker's sheet rock material while providing enough room for the worker to operate.

Abstract: A first embodiment of a safety rail for a folding scaffolding cart comprises a single hollow metal tube having two longitudinal ends and shaped to have three smooth 90 degree bends to fit diagonal posts of a folding scaffold. The portable scaffolding cart is a folding platform supported by a rectangular framework having four vertical tube supports with one support tube at each corner. Each support tube has lockable wheels. The vertical supports extend above the platform. The safety rail of the platform connects in an overlapping arrangement to the supports. Alternatively, self-tapping screw fasteners can secure the safety rail. The safety rail is a single shaped tube. Three smooth 90 degree bends in the safety rail allow it to extend upward from a first support, around the perimeter of the platform and back down to a diagonal second support.

Abstract: An apparatus used as a tool, to lock and unlock the casters of a scaffold while the user is on top of a scaffold. The apparatus is an elongated pole and adjustable sleeve with a spring-loaded push button mechanism, to change the length of the apparatus. There are a variety of specially designed heads that are used to adjust the scaffold caster levers in locked and unlocked positions. This is done in place of a user climbing up and down the scaffold and manually locking and unlocking the scaffold caster levers from the ground level. A rubber mallet head or contact bulb is provided near the handle to further adjust the scaffold casters, and a looped strap is also provided to hang the apparatus when not in use.

Abstract: A system and method for providing an improved ladder for enabling a user to climb up or down and forward or backwards movement relative to a surface. The system enables increased mobility and stability. The system can be designed in multiple ways which some of them have been shown in the present invention. The present invention clearly saves production time, keeping the user on the ladder while relocating, and it definitely more convenient and time saving to the user.

Abstract: A device for allowing a user to selectively extend and retract wheels at the feet of an A-frame stepladder thereby enabling the user to move the ladder from point “A” to point “B” without physically moving, lifting or dragging the ladder. The apparatus includes a gear assembly at the foot of each ladder siderail having an attached caster-style wheel. Each gear assembly is mechanically associated with a handgrip trigger mechanism located along the ladder siderail in a position convenient for the user to operate with each handgrip trigger mechanism controlling the two gear assemblies on the same side of the stepladder.

Abstract: A ladder-cart for transporting materials has a storage portion with a substantially horizontal area for placing the materials theron. It has a frame having a plurality of support members connected to the storage portion to secure the storage portion above ground level. A plurality of wheels are attached to the frame for engaging the ground and a ladder portion comprising a plurality of steps is integral with the frame.

Abstract: A maintenance platform (10) comprises a main frame (12) with base frames (12,14) releasably interconnected by split clamps (50) and load transfer couplers (52). Upper extension frames (62,64) are mounted on the base frames (12,14). A balcony (82) and stabilizers (100) are also provided. The platform (10) is of modular construction and can be assembled and disassembled manually without tools for use on either improved or unimproved surfaces.

Abstract: A maintenance cart for use in an aircraft interior is disclosed. The maintenance cart has a pair of maintenance platforms which are capable of being disposed within the maintenance cart. A linear track mechanism is coupled to the maintenance platform which allows for the deployment of the maintenance platforms within an aircraft. A pair of deployable steps are provided which allow maintenance personnel to move through the maintenance cart to the fore or aft of an aircraft.

Abstract: An undercarriage for a mobile ladder stand or other similar warehouse apparatus includes a pair of retractable wheels located at the rear of the undercarriage frame and a pair of retractable wheels located at the middle of the undercarriage frame. When the wheels are retracted, the structure is supported by a pair of legs and foot pads located at the front of the undercarriage frame and another pair of legs and foot pads located at the rear of the undercarriage frame. When the wheels are extended, the structure is supported on the ground surface for rolling by the middle and rear wheels. The rear wheels are preferably mounted on swivel casters and the diameter of the middle pair of wheels is preferably greater than the diameter of the rear pair of wheels.

Abstract: An outrigger assembly useful for supporting and stabilizing a mobile work machine, such as a vehicle-mounted telescopic belt conveyor, while the work machine is operating. The outrigger assembly includes a stationary support housing mounted to the vehicle body and a telescoping inner housing that is movable into and out of the support housing. A leg assembly, in turn, telescopes into and out of the inner housing and includes a leg member that is pivotally mounted to a mounting beam of the leg assembly. The leg member includes a support pad that contacts the ground when the leg member is in its ground-engaging position and covers the opening to the inner housing when the leg assembly is in its fully retracted position.

Abstract: An equipment support leg providing a multiplicity of functions. Static applications are addressed through a threaded shaft and foot. The improved foot is bolted into support legs in such a way as to allow swiveling desirable for conforming to grounds. Mobile applications are addressed through a modified castor. The castor may be lowered to the ground or retracted into a safe position by use of a handle attached to a bearing. Jacking or leveling needs are met by use of the leveler handle which is attached to a bearing, located near the top of threaded shaft. Therefore, one support leg converts from stationary capabilities to mobile capacities, and converts back again into the original stationary position.

Abstract: The ladder stand employs a pair of swivable caster wheels at the front and a pair at the rear which are used in cooperation with a pair of closely located non-swivable caster wheels, thereby providing a structure which has three modes of operation, one mode for climbing, a second mode which permits the stand to be pushed in a straight line with wide turns and a third mode of operation which permits the stand to be first pushed laterally and to provide sharp turns. A front wheel support is mounted on the front end and a retractable first pair of swivable caster wheels is mounted on the front support. A rear wheel support is mounted on the rear end, with a retractable second pair of swivable caster wheels mounted on the rear support. A third pair of non-swivable rigid caster wheels are mounted at the rear end.

Abstract: A combined stepped structure and lifting mechanism includes a base and a framework secured to the base, the framework having a pair of spaced apart vertical tubes rising upwardly from the base. A ladder is incorporated in the framework and a vertical track assembly is disposed between the vertical tubes and includes a pair of tubular members connected together. A trolley is rollably mounted for movement along one of the tubular members. A lifting tray assembly is connected for movement with the trolley. A drive system is operably connected to the trolley and driven by a DC motor and gearbox unit mounted to a bottom end of the vertical track assembly to selectively move the lifting tray assembly upwardly and downwardly along the vertical track assembly.

Abstract: A safety ladder stand comprising a generally rectangular base having a front and rear and a center beam, a plurality of stair treads extending upward from the front of said base and means for supporting said stair treads secured to said base, front wheels mounted at the front of said base and beneath the top of said stair treads; center wheels mounted on said center beam of said base, and rear wheels mounted at the rear of said base, and a set of feet mounted on the front of said base; wherein said ladder stand has an activated position wherein said front and center wheel sets are in contact with the ground to enable said ladder stand to roll and said rear wheels and front support feet are not in contact with the ground, as well as a deactivated position wherein the front and center wheel sets are not in contact with the ground and said rear wheels and front support feet are in contact with the ground to prevent said ladder stand from being rolled; and means for moving said ladder stand from said deactivated

Abstract: A mobile ladder (10) including a goods lift (12) which can be driven between upper (FIG. 3) and lower (FIG. 4) positions. The ladder has a default-immobile state which can be overcome by a force manually applied to a handle. The ladder can then be moved and steered via the handle.

Abstract: A default-immobile ladder (10) includes mobility means (12) displaceable between a ladder immobile position and a ladder mobile position in which the mobility means extends downwardly beyond the foot of the ladder and manually actuable means (32) for displacing the mobility means from the ladder immobile position to the ladder mobile position. When the manually actuable means is released, the mobility means returns to the ladder immobile position.

Abstract: A trailer personnel lift (20) with a level-sensing system (69). The level-sensing system (69) provides information to a level-indicator display (72) that indicates which outriggers (34) of the trailer personnel lift (20) need to be lowered. Upon lowering of the designated outriggers (34), the signal for the outrigger (34) changes so as to indicate that the outrigger (34) no longer needs lowering. The outriggers (34) are capable of locking into at least three positions, a first position (40A) in which the outrigger (34) extends substantially horizontal to the surface upon which the personnel lift (20) is to be located, a second position (48A) in which the outrigger (34) extends substantially vertically from the base, and a third position (46A) that is intermediate of the first and second positions, the third position being selected so that the outriggers (34) may be stabilized in the third position (46A) on an upward slope.

Abstract: A safety ladder stand comprising a generally rectangular base having a front and rear and a center beam, a plurality of stair treads extending upward from the front of said base and means for supporting said stair treads secured to said base, front wheels mounted at the front of said base and beneath the top of said stair treads; center wheels mounted on said center beam of said base, and rear wheels mounted at the rear of said base, and a set of feet mounted on the front of said base; wherein said ladder stand has an activated position wherein said front and center wheel sets are in contact with the ground to enable said ladder stand to roll and said rear wheels and front support feet are not in contact with the ground, as well as a deactivated position wherein the front and center wheel sets are not in contact with the ground and said rear wheels and front support feet are in contact with the ground to prevent said ladder stand from being rolled; and means for moving said ladder stand from said deactivated

Abstract: A support frame assembly including at least one pair of generally vertical spaced uprights joined together by transversely extending structural members and having caster wheel support members for supporting a rotatably mounted caster wheel mounted axle and a pedal actuatable lever engaging the axle to allow selective movement of the caster wheel mounted axle between "mobile" and "use" mode conditions--the invention further including a joined second pair of generally vertical spaced uprights each having a caster wheel support member for yieldably supporting a caster wheel arrangement for selective movement between "mobile" and "use" modes.

Abstract: A safety ladder stand comprising a generally rectangular base having a front and rear and a center beam, a plurality of stair treads extending upward from the front of said base and means for supporting said stair treads secured to said base, front wheels mounted at the front of said base and beneath the top of said stair treads; center wheels mounted on said center beam of said base, and rear wheels mounted at the rear of said base, and a set of feet mounted on the front of said base; wherein said ladder stand has an activated position wherein said front and center wheel sets are in contact with the ground to enable said ladder stand to roll and said rear wheels and front support feet are not in contact with the ground, as well as a deactivated position wherein the front and center wheel sets are not in contact with the ground and said rear wheels and front support feet are in contact with the ground to prevent said ladder stand from being rolled; and means for moving said ladder stand from said deactivated

Abstract: A mobile scaffolding apparatus having wheel support means which can be moved out of engagement with the ground. The wheel support means are mounted to a conventional scaffolding frame made of at least three, preferably four, vertical posts rigidly connected by bracing members. A foot pad is rigidly connected to the lower end of each of the vertical posts. When the wheel support means are moved into engagement with the ground, the mobile scaffolding apparatus rests upon the wheel support means and can travel. When the wheel support means are moved out of engagement with the ground, the mobile scaffolding apparatus rests stationary on the scaffolding frame foot pads. The wheel support means are moved into and out of engagement with the ground through either pivoting or retracting the wheel support means. There are two embodiments for pivoting the wheel support means. In both embodiments, the wheel support means have a wheel and axle assembly, a pivoting rod, and a brace member.

Abstract: A trailer personnel lift (20) with a level-sensing system (69). The level-sensing system (69) provides information to a level-indicator display (72) that indicates which outriggers (34) of the trailer personnel lift (20) need to be lowered. Upon lowering of the designated outriggers (34), the signal for the outrigger (34) changes so as to indicate that the outrigger (34) no longer needs lowering. The outriggers (34) are capable of locking into at least three positions, a first position (40A) in which the outrigger (34) extends substantially horizontal to the surface upon which the personnel lift (20) is to be located, a second position (48A) in which the outrigger (34) extends substantially vertically from the base, and a third position (46A) that is intermediate of the first and second positions, the third position being selected so that the outriggers (34) may be stabilized in the third position (46A) on an upward slope.

Abstract: Travelling scaffoldings must cope with manifold tasks and especially be characterized in that their resting surface must adapt to various conditions. In the disclosed scaffolding, the roller-bearing traverses (16) are subdivided into two parts and the parts (16a, 16b) are interconnected and slanted in relation to the rectangular base structure of the scaffolding, so that the widening traverses (15) allow the distance between the rollers to be increased in two mutually perpendicular directions.

Abstract: Mobile scaffoldings must fulfill many different purposes, which, among others, are characterized by variously wide platforms being needed at different distances from structures. An inventive arrangement is adaptable to a degree that it meets many demands. Movable crossbeams changeable on cross-traverses are provided for this purpose in the area of the undercarriage, on which crossbeams are fastened to the posts for the frames connected with the platforms.

Abstract: A mobile ladder arrangement including base, ladder and linkage and caming assemblies therebetween to provide a foot actuated ladder assembly secured "use mode" and a hand actuated ladder assembly "mobile mode".

Abstract: A ladder system comprising a ladder having side rails and a plurality of steps disposed between the side rails. The ladder system also is comprised of at least one corner brace for supporting a bottom step of the ladder. The corner brace is attached to a side rail of the ladder and the bottom step. Additionally, the ladder system is comprised of at least one caster assembly integrally attached to the corner brace for allowing the ladder to roll. Preferably, the caster assembly and corner brace are disposed on the ladder such that a predetermined weight placed on the ladder prevents the ladder from rolling. The corner brace is preferably comprised of a first portion, a second portion connected to the first portion and a third portion connected to the second portion. The first portion is attached to a bottom of the ladder. The second portion is attached to the caster assembly. Additionally, the third portion is attached to a rail of the ladder.

Abstract: A stepstool (10) is disclosed having a central planar top platform (14), four support legs (20,22,24,26) for supporting the platform, and a pair of storage receptacles (36,38) extending outward in cantilever fashion from opposite sides of the stool. The receptacles (36,38) are open at the top to accommodate receipt of tall bottles or the like, and act as counterbalancing weight with which to stabilize the stool against tipping. The stepstool receptacles hang above floor level a nominal distance so as not to interfere with level positionment of the stool upon the floor surface.

Abstract: A rolling platform ladder includes a frame supporting a stairway and a flat work platform area at the top of the stairway. The frame includes a base portion that has a cantilevered front area for preventing tipping over if the platform is overloaded. A main structural support column is placed at the center portion of the platform and extends down at an angle toward the rear of the base. At least a portion of the platform is positioned in front of the column during use. This configuration enables at least a portion of the platform to be positioned over machines, conveyors and over obstructions. A portion of the base extends in front of the frame so that it can extend under objects elevated slightly above a work surface such as an elevated conveyor or machine.

Abstract: A portable scaffold has a frame with a pair of spaced apart, longitudinal members which are essentially parallel to the direction of forward travel of the frame. The frame has a plurality of wheel assemblies attached to each corner thereof with pneumatic tires thereon so that the frame can travel over public roads or the like. A scaffold structure is attached to the longitudinal members by an attachment structure which will telescope between a narrow length which is within legal limits for highway travel. Similarly, transverse members connecting the longitudinal frame members together are provided which also can be telescoped between a narrow distance for legal travel down a public highway and a wider distance which provides the necessary base of a platform for the scaffold so that the scaffold can extend higher than would otherwise be permissible if the portable platform could not be widened.

Abstract: A new and improved overhead package retrieval system, including a series of C-shaped tracks which are mounted onto storage shelf units, a platform that has rollers that fit within these C-shaped tracks and allow the platform to move, a special jointed retractable axle system which allows the platform to move along the tracks even if they are not completely parallel, a fold-up ladder for a user to get from ground to platform level, a special brake that operates when fold-up ladder is down to prevent movement of the platform, a package platform that allows a user to easily move packages from the platform to the ground, and a series of guard rails and hand rails to make the overhead package retrieval system safe.

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.