Abstract: A multi-use support stand used for holding various types of building materials and used in other types of construction projects. The support stand includes a horizontal foot brace and a horizontal cross brace attached to a bottom of a vertical support post. An oblique support post is attached to a top portion of the vertical support post and a portion of the foot brace. One end of a horizontal extension arm is attached to a sliding “U” shaped channel. The channel is received around a portion of the oblique support post. A pin is received in a selected pin hole in the side of the support post for securing the sliding channel to the oblique support post. When a first and second support stands are placed next to each other, the horizontal extension arms are used for holding loads of sheet rock, plywood, bench table top, working platform, shelving, footbridge sections, dimensional lumber, and other application specific items needing to be supported horizontally or an elevated obtuse angle.

Abstract: An elevated workspace platform for rapid installation over and around wellhead equipment, frac trees and manifolds for providing oilfield worker access to equipment. Lift points provide engagement with forklift or other lifting machinery for deployment onsite and do not require any personnel to be underneath. Foldable support legs are securely locked into upright configuration with a hand operated spring-loaded latch. Reinforced steel plate boxes surround and achor the support legs to the elevated platform. Modularized design allows the platform to be stackable for transport to the oilfield work site. Removable and adjustable height stairways, handrails and self-closing gates ensure worker safety and access to equipment. Leveling jacks compensate for uneven ground surface conditions. Safety features reduced slips and falls and decrease insurance costs.

Abstract: A height access device enables motorized access to the driving station of a tower crane atop a mast formed of superposed mast elements. It includes a lift cabin installed inside the mast of the crane and movable vertically along the mast. The height access devices further includes a working platform positioned above and separably connected to the lift cabin. A coupling device provides a non-permanent connection of the working platform to the lift cabin and immobilizes the working platform relative to the mast at a required height. The height access device enables the crane driver to ascend and descend with the lift cabin alone when disconnected from the working platform and with the lift cabin and working platform together, particularly during the assembly and dismantling of the mast.

Abstract: This implement attaches to the hydraulic system of a front-end loader for a tractor or similar vehicle. It has two planar surfaces, a deck and a back, that are fastened together at an approximately 90 degree angle. The deck is constructed primarily of wooden or synthetic boards or sheets, supported below or above by two or more steel angle irons or channel irons bolted to the boards or sheets. The back consists of a similar combination of boards or sheets, irons, and bolts, with a grill or strips possibly replacing some boards or sheets in the upper part. Each deck support is fastened to a back support using one or two steel braces or gussets, bolted or welded to the supports. Two steel yokes are fastened to the back, suitable for attaching the carrier to the front-end loader hydraulics. The carrier can be lifted and tilted by the front-end loader system, just as the system would do with its normal bucket attachment.

Abstract: The present invention relates to a tower for a wind power installation. The tower comprises a wall extending from a foundation in an upwards direction towards a nacelle and defines an enclosed space. Furthermore, the tower comprises a safety blanket which is distended across the tower interior along an inner surface of the wall to thereby split the enclosed space into an upper compartment above the blanket and a lower compartment below the blanket. The safety blanket is flexible.

Abstract: A safety lockout system for releasably locking a mast guided working surface to a mast is provided. The safety lockout system may include an outer rollcase, an inner rollcase, and a lockout assembly. The lockout assembly includes a retractable dog that is movable between an engaged position and a disengaged position. The lockout assembly may include a dog release device that operates both manually and automatically to move the retractable dog from the disengaged position to the engaged position. Automatic operation of the dog release device is triggered when the working surface experiences a tilted condition. A dog emergency release device may be provided to manually move the retractable dog to the disengaged position in the event of a malfunction. The lockout assembly may include a lockout assembly locking device that allows a portion of the lockout assembly to fold up and move the retractable dog to the disengaged position.

Abstract: An apparatus for cranking a shackle of a pump jack. The apparatus includes a shaft which fits through the shackle. The apparatus includes an arm rotatably attached to the shaft The apparatus includes a handle for cranking the shaft. The handle having a locked state in which the handle is unable to rotate the shaft, and an unlocked state in which the handle is able to rotate the shaft. The handle attached to the arm. The apparatus includes a locking mechanism engaging the arm at a pivot point and the shaft, the locking mechanism placing the handle in the locked state or the unlocked state by moving the handle about the pivot point to a first position or a second position, respectively.

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 safety jack plate, which is a plate assembly that can be used in conjunction with standard pump jacks with standard scaffolding is used by contractors. Each safety jack plate includes a flat plate, a pair of end pieces attached to the flat plate, a pair of cutouts on each end piece so that each end piece can be mounted over the rails of a jack, and ridged surface on the flat plate and each of the end pieces.

Abstract: An apparatus for cranking a shackle of a pump jack. The apparatus includes a shaft which fits through the shackle. The apparatus includes a handle for cranking the shaft. The handle having a locked state in which the handle is unable to rotate the shaft, and an unlocked state in which the handle is able to rotate the shaft. The apparatus includes a locking mechanism engaging the handle at a pivot point and the shaft, the locking mechanism placing the handle in the lock state or the unlocked state by moving the handle about the pivot point to a first position or a second position, respectively. A method for cranking a shackle of a pump jack.

Abstract: An upper shackle assembly for a steel pump jack for a wood pole includes a u-shaped shackle component to receive the wood pole. The assembly includes a crank handle that extends through the shackle component and engages the pole to lower the pump jack down the pole. The assembly includes a brake attached to the shackle component to engage with the pole if the crank handle fails. A method for installing a steel pump jack to a wood pole includes the steps of placing a u-shaped shackle component about the wood pole. There is the step of closing a brake with the shackle component to engage with the pole if a crank handle fails. There is the step of extending the crank handle through the shackle component to engage the pole. A steel pump jack.

Abstract: A system for lifting a platform includes a frame attached to the platform. The invention has at least one upright member having equally spaced holes longitudinally aligned, with each of the holes having an upper surface and a lower surface. A motor is attached to the frame, and a pinion is driven by the motor. The frame carries the motor and pinion. The pinion has a plurality of equally spaced teeth that radially extend from the pinion. Each tooth has a roller that is freely rotatable about its axis. The rollers roll over the lower surface of the holes when the motor rotates the pinion in a direction to raise or lower the frame and platform. A safety dog is attached to the frame to prevent the platform from falling if a motor were to fail.

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: The present invention provides a support clamp device for a safety rail or similar device adapted for mounting on a pump jack pole comprising: a first pole clamp, circumscribing a generally rectangular perimeter, the first pole clamp comprising a generally U-shaped bar having a first side; a second side and a third side, wherein the first and third sides are approximately parallel to each other and the second side is approximately perpendicular to the first and third sides and wherein the second side further comprises an aperture; and a fourth side removably attached to the first and third sides opposite and approximately parallel the second side; and a second pole clamp, circumscribing a generally rectangular perimeter, the second pole clamp comprising a generally U-shaped bar having a first side; a second side and a third side, and a pole clamp connecting fastening means, the first pole clamp and the second pole clamp are able to pivotably rotate about the axis formed by the pole clamp connecting fastener.

Abstract: A self-raising platform assembly (1) comprising at least one mast (3, 5, 113) along which a platform (13) may be moved up or down including the following: a) a base element (9) with a supporting plate (25) connected to a jack (27) and several stabilizer arms (33, 37) incorporating height adjustment. b) modular mast sections (7) made from rectangular sections with openings (63) cut out to form steps and bars (55) to allow adjacent sections to be bolted together. c) hydraulically operated ram lifting mechanism (73, 83, 84) with hooks (77, 79, 81) to engage steps on the mast to raise and lower the platform. d) a plastic lined sleeve (17, 19) on the platform which slides against the mast. e) a modular platform which can be lengthened or widened by adding additional modules (101, 103).

Abstract: Scaffold erected adjacent to a wall, which enables an easy plastering, drying cleaning, coloring, etc. operation of the wall by automatic means. Said scaffold comprises: a. a platform being erected adjacent and parallel to the wall; b. column members carrying the platform and being connected to the wall, said columns being provided with electrically actuating means enabling the ascending and descending of the platform: c. a movable apparatus (or “cat”) being attached to the platform, preferably located thereunder, which cat is able to move along the length of the platform and is provided with automatic means for actuating the plastering operation and realizing obstacles: d. automatic means for actuating the movable parts of the scaffold; and e. a storage container being suitably connected to the means performing the plastering operation.

Abstract: A self-raising platform assembly (1) comprising at least one mast (3, 5, 113) along which a platform (13) may be moved up or down including the following: a) a base element (9) with a supporting plate (25) connected to a jack (27) and several stabilizer arms (33, 37) incorporating height adjustment, b) modular mast sections (7) made from rectangular sections with openings (63) cut out to form steps and bars (55) to allow adjacent sections to be bolted together, c) hydraulically operated ram lifting mechanism (73, 83, 84) with hooks (77, 79, 81) to engage steps on the mast to raise and lower the platform, d) a plastic lined sleeve (17, 19) on the platform which slides against the mast, e) a modular platform which can be lengthened or widened by adding additional modules (101, 103).

Abstract: A self-raising platform assembly (1) comprising at least one mast (3, 5, 113) along which a platform (13) may be moved up or down including the following: a) a base element (9) with a supporting plate (25) connected to a jack (27) and several stabilizer arms (33, 37) incorporating height adjustment. b) modular mast sections (7) made from rectangular sections with openings (63) cut out to form steps and bars (55) to allow adjacent sections to be bolted together. c) hydraulically operated ram lifting mechanism (73, 83, 84) with hooks (77, 79, 81) to engage steps on the mast to raise and lower the platform, d) a plastic lined sleeve (17, 19) on the platform which slides against the mast e) a modular platform which can be lengthened or widened by adding additional modules (101, 103).

Abstract: A scaffold structure accessory is essentially comprised of a elongated, horizontal, laborer's alternate walkway and material support member having a clevis connector at its inboard end and a safety rail receptacle connector at its outboard end, a first vertical support member attached to the laborer's alternate walkway and material support member near its outboard end, a second vertical support member attached to the laborer's alternate walkway and material support member near its inboard end, and a connector on each vertical support member that co-operates with the scaffolding laborer's walkway and material support of a conventional prefabricated lift-type scaffolding module.

Abstract: A scaffolding system for volumes of various shapes that present a bottom and end walls. The system includes at least a first scaffolding structure having a gantry with at least two interconnected vertical poles; guides secured to the bottom of the volume to guide the poles in rectilinear displacement in a longitudinal direction; a horizontal main platform defining at least a working floor, and guides for guiding the main platform in vertical translation along the poles; at least two horizontal auxiliary platforms each defining a working floor mounted to move in horizontal translation relative to the main platform; and structure for displacing each auxiliary platform separately relative to the main platform between a retracted position and an extended position in which the outer edge of the auxiliary platform is substantially in register with the outer edge of the main platform.

Abstract: A lift apparatus having a pair of support members and a carriage movable along the support members. The carriage includes a pair of rotating members, a band extending between and around the rotating members and a plurality of lift members carried by the band and engageable with support surfaces on the support members. The invention also relates to a support member and a carriage useable with the lift apparatus.

Abstract: An adjustable height scaffold includes an upright and a cage for mounting a work platform on the upright. The cage has two spaced side plates on opposite sides of the upright. Two crossbars are connected to the side plates for relative movement of the crossbars between a captured position with the crossbars spaced by a distance greater than the cross section of the upright and a release position spaced by a distance less than the cross section of the upright. The couplings joining the crossbars to the side plates prevent disconnection of the crossbars from the side plates in the captured position but allow disconnection of at least one of the crossbars from the side plates in the release position. With the upright in the cage between the crossbars, the crossbars cannot move to the release position.

Abstract: A raising system for scaffolding, elevator cabins and the like which comprises a vertical stationary beam member from one side of which equally vertically spaced similar rack teeth are protruding, each tooth having a substantially horizontal straight top face, a framework guided for up and down movement along said beam member, a power driven shaft rotatably supported by said framework and carrying spaced radial supports, a series of parallel idle shafts extending between the supports, equally spaced from one another and radially equally spaced from the driven shaft, and a plurality of cylindrical roller assemblies rotatably mounted on the idle shafts and adapted to come in successive rolling engagement with the top faces of said teeth during upward or downward movement of said framework. Each roller assembly includes several rollers disposed side by side.

Abstract: A self-elevating platform construction consisting of first (3) and second (4) vertical masts each provided with a rack (13), first (14) and second (15) carriages movable along the first and second masts respectively, and each provided with a gear (26) rotated by a motor and meshing with the mast rack (13), as well as a support for a platform (16) borne on supporting shafts (32) of said first and second carriages (14, 15) and extending between said first and second masts (3, 4). The construction is characterized in that the platform (16) is rigid and in that the supports (32) of the first and second carriages (14, 15) comprise shafts (32) perpendicular to the rack (13) of the first and second masts (3, 4), respectively. Said construction is mainly suitable for building construction and renovation.

Abstract: The invention relates to an elevating work platform having a working platform (16) which can move vertically upwards on at least two parallel masts (3, 4), and which has a carriage (14, 15) for each mast (3, 4). The carriage (14, 15) is guided on the respective mast (3, 4) and has a driving unit. The working platform (16) is supported on the carriage (14, 15) by means of joining elements (40), and power transmission between the mast (3, 4) and the carriage (14, 15) takes place by positive locking. The invention seeks by simple means to compensate the movement of the working platform (16) in relation to the masts (3, 4). This is necessary due to the load to which the working platform (16) is subjected and due to construction tolerances, and so as to prevent high levels of tension in the devating work platform.

Abstract: A lift apparatus having a pair of support members and a carriage movable along the support members. The carriage includes a pair of rotating members, a band extending between and around the rotating members and a plurality of lift members carried by the band and engageable with support surfaces on the support members. The invention also relates to a support member and a carriage useable with the lift apparatus.

Abstract: A scaffolding system that includes a pair of tower portions, with each tower portion having a proximal section that is held in working relation with a bearing surface and each tower portion having a distal section, a platform, the platform supported by the distal section of each tower portion and the platform selectively movable both toward and away from the bearing surface, and a conveyor, the conveyor positioned on the platform between the pair of tower portions.

Abstract: In a scaffolding at least one tower anchor to secure the tower to a wall, a sleeve surrounding the tower and guided for up and down movement along the same, a support frame releasably secured to the sleeve in vertical position and normal to the wall, a shiftable frame moveably supported by and parallel to the support frame, replace ("the wall supported by the sleeve not ",) by and releasably secured to the shiftable frame at one end a work platform parallel to for horizontal shifting movement transversely of the tower towards and away from the wall and an actuator carried by the support frame and acting on the work platform through the intermediary of the shiftable frame to effect said shifting movement.

Abstract: A scaffolding mast with at least two profile bars (1, 2, 3) which are attached to the edges of a triangle or square forming the cross section of the scaffolding mast. Two of the profiles (1, 2, 3) are connected to one or two of three connecting plates (10, 17, 18) forming the side of the triangle or square. Two grooves (4-9) are provided on the inner area of each of the profile bars (1, 2, 3) in which 90.degree. offset edges (13, 14) of the connecting plate (10, 17, 18) are inserted and fastened at the place of insertion (FIG. 1).

Abstract: A pump jack hoisting apparatus includes a safety railing for protecting workers from accidental falling. The apparatus includes a pair of laterally spaced pump jack poles each of which is associated with a respective pump jack. Each pump jack includes inner and outer support extensions for supporting thereon inner and outer walking platforms. A pair of generally L-shaped support frames is removably secured to the outer support extension of the respective pump jack. Each support frame includes a vertically extending arm and a horizontally extending brace. The brace includes a mounting member for engaging the outer arm of the respective pump jack. A plurality of generally L-shaped rail brackets are vertically spaced on the arms and include a top-open recess. A safety rail is removably positioned in the recess and extends between the pair of support frames.

Abstract: Novel motorized scaffold hoisting units are provided that are intended to be used in pairs with two jack poles. Each unit comprises a carriage that is adapted to be slidably disposed on a jack pole and has guide means that restrain the carriage from moving laterally while allowing it to be raised or lowered along the length of the pole. Each unit also comprises a hoist or winch that is mounted on a platform carried by the carriage and comprises a cable-carrying drum and a power transmission for rotating the drum in response to rotative power supplied by an auxiliary electrically powered driver. The outer end of the cable carried by the drum is adapted to be releasably attached to the upper end of a jack pole on which the unit is mounted. Each carriage also carries at least two fail-safe brake means for releasably gripping the pole on which the carriage is mounted, and means in the form of a laterally-projecting arm for supporting a scaffold, e.g., a wooden or aluminum plank.

Abstract: A work platform is supported by a sleeve which is movable along a tower having a plurality of vertically equally spaced rungs. The raising system of the invention comprises two hydraulic rams pivotably attached to the sleeve and equipped with corresponding hooks at the extremity of their piston rods. The rams are activated simultaneously in up and down movement but in alternate directions, bearing in a hooking engagement in turn on the rungs of the tower to pull the sleeve upwards along the tower. When a rung is in the path of a hook in the upward movement, the latter pivots backwards to clear the rung and is pivoted back by means of springs.

Abstract: A modular scaffolding assembly in which the platform may move up or down in a continuous motion. A platform carriage is engaged with a tower by spring loaded friction blocks and climbs or descends the tower along a pair of stepped racks. Platform modules may be removably connected to the platform carriage.

Abstract: Wheelchair lift (10) includes a platform (12) mounted on a carriage (14) for vertical travel between the ground and an elevated location along a mast structure (16) through the use of a linear, lift actuator (18). Platform (12) includes an upper main section (20) and a lower movable section (22) that is horizontally extendible and retractable by a linear, platform actuator (24). The actuators (18) and (24) are cooperatively interconnected with and controlled by a power system (28) so that platform (12) is raised to a desired height before the movable section (22) is extended, and conversely the movable section (22) is fully retracted before the platform (12) is allowed to lower to the ground.

Abstract: An apparatus for self-adjusting the height of an outrigger attachable to scaffolding comprising a support having a back wall and side walls with a plurality of apertures located along the length of the back wall, the exterior of the back wall having clamps for removable coupling with tubular scaffolding. The apparatus further includes a vertically disposed angle iron positioned parallel with the support on the side there opposite from the clamps and having coupled thereto at its upper and lower ends a wheel carriage for riding within the support. The apparatus further includes an outrigger platform extending forwardly from the angle iron and secured thereto for supporting an operator standing on the platform. The apparatus further includes motion imparting means to move the platform with respect to the support.

Abstract: The scaffolding includes a tower provided with equally spaced rungs and adapted to be secured to an adjacent building structure, an outer sleeve surrounding the tower and guided therealong and a work platform supported by the outer sleeve. The raising system includes an inner sleeve surrounding and guided on the tower inwardly of the outer sleeve, a pair of latching levers pivoted to the outer sleeve and latching onto the tower, a pair of hydraulic rams pivoted to the outer sleeve and to the inner sleeve and reciprocating the latter for up and down movement relative to the outer sleeve, and a pair of hooks pivoted on the inner sleeve to engage and disengage opposite rungs of the tower. To raise the outer sleeve and work platform, the rams are retracted while the inner sleeve is hooked to the tower. When the ram retracting stroke is completed, the latching levers latch the outer sleeve to the tower and the rams extend to raise the inner sleeve which is then hooked to a higher pair of opposite tower rungs.

Abstract: The self-raising work platform assembly is of the cantilever type in that it comprises a single tower, a sleeve surrounding and guided along said tower for up-and-down movement, power-operated raising means for said sleeve and a pair of horizontally-extending cantilever work platforms attached to said sleeve on opposite sides thereof. A second pair of oppositely-extending work platforms are disposed above the first pair and guy wires interconnect the work platforms.

Abstract: The self-raising work platform assembly includes a pair of spaced towers adapted to be erected alongside a building structure, sleeve members surrounding and guided along the respective towers, joists extending between and releasably hooked to the sleeves, a flooring supported by the joists and chain blocks carried by the sleeves. The chains can be hooked to the tower to raise the sleeves, the joists and the flooring, to the level at which work on the building is to be effected.

Abstract: The invention also contemplates a retractable corner mechanism for the inside corner of the concrete form. The mechanism comprises an elongated corner member having first and second perpendicular faces joined along a first edge of each face to form a corner and having form attaching means along a second edge. A concrete form has an end attached to each of the second edges. Means are provided for sliding the forms relative to the corner member and means is provided for retracting and extending the forms to cause the corner member to be retracted and extended. The forms can be made of plywood or metal and the use of steel is contemplated for the corner members. The retracting and extending means can include an externally threaded rod pivotally connected adjacent the end of one of the concrete forms and an internally threaded member pivotally connected adjacent the end of the other of the concrete forms and treadably received on the rod.

Abstract: An elevator work station having an upright back with a top and a bottom and a pair of stanchions that connect to the top and to the bottom. Each of the stanchions has a longitudinal slot that traverses the length thereof. A base is generally secured normally to the upright back, more particularly to the stanchions, for supporting the upright back in a generally upright position. A work station is slidably secured to and along the upright back, more specifically within the slots of the stanchions, such that the work station can travel generally from the top of the bottom of the upright back to the top thereof. A work station movement control is mounted to the work station. The elevator work station is provided with a pair of pedals which when pedalled in a predetermined direction can raise or lower the work station. The pedals control a cable that extends from the top of the upright back to a winch member that is controlled by the pedals.

Abstract: A plurality of longitudinally extending deck elements are each supported by transversely directed horizontal support rods at each end of each deck element. The rods are slidably removable through transversely aligned holes through vertical angle brackets paired to be adjacent the ends of the deck elements. The angle brackets are coupled at fixed elevations, relative to the water surface, to appropriately located pilings or bulkheads, and include a plurality of vertically spaced apart holes accepting the support rods at differing elevations. Brackets couple the end of the deck element to the corresponding support rod in a manner allowing some relative longitudinal displacement to allow for installation of the deck element as a ramp or to enable one end of the deck element to remain installed while the other end is adjusted to a different elevation.

Abstract: An apparatus has been provided for vertically lifting or lowering a workman and/or materials at a construction site. This includes a rectangular platform having four corners for supporting the workman and/or material so that they can be vertically moved within an elevator shaft or the like. The platform has side edges positioned adjacent the side walls of the shaft. The platform can be raised or lowered by a crane. Recesses are provided in opposite side walls for receiving latches attached to the corners of the platform. The latches are locked in place when they are positioned within the recesses and can be retracted when the platform is to be raised and lowered. Also, leveling devices are provided at the corners of the platform for leveling the panels and devices are also provided for holding the panels in proper location prior to pouring the concrete.

Abstract: A scaffold jack includes a jack housing mounted for slidable movement on a vertical post. The jack housing has a support beam projecting horizontally therefrom upon which a working platform is supported above the ground. A ratchet mechanism on the housing includes a pawl which will cooperate with apertures in the vertical post to allow upward movement of the jack housing and support the housing above the ground. A winch is mounted to the jack housing and has a hook and cable connected thereto which may be connected to a bracket journaled in an aperture at the upper end of the post, such that the jack housing may be winched upwardly. A pair of horizontally oriented rigid legs are provided which are connectable to the post and to an adjacent vertical wall structure, such that the post may be stabilized in a vertical orientation.

Abstract: A portable scaffold includes a base or chassis mounted on wheels for site-to-site towing or "man-handled" positioning at a job site. Rising rigidly from the chassis are two masts, spaced apart lengthwise of the chassis. A platform is vertically slidably carried by the mast for selective elevation and descent via power devices. Each mast may be increased in height by the addition thereto of a mast extension that functions as a prolongation of the basic mast. One of the power devices is alternately positionable to function as a temporary source of power for moving the scaffold through short distances. Strap elements are provided for temporarily bracing the masts from a structure being worked on by workmen on the platform.

Abstract: This scaffolding comprises a base, a pair of spaced posts on said base each formed of modular post sections, releasably secured one on top of the other by fasteners. Each post section is formed of a lattice frame with transversely-extending bars forming anchoring steps, equally spaced along the post. A work platform surrounds the posts and is guided therealong for up-and-down movement. A pair of anchoring hooks are pivoted at theri lower end to the platform and are engageable with the steps of the two posts to suspend the platform. A pair of hydraulic rams are pivoted also to the platform adjacent each post and upwardly-upstanding piston rods are provided with hooks to engage the steps of the post and raise or lower the platform. The hydraulic supply for the rams is mounted on the platform. The hook members are biased towards the posts, so that they automatically engage the steps. A single operator can operate the rams to raise and lower the work platform.

Abstract: A scaffold system has self standing towers and brackets that are guided and supported by the towers. The towers include three legged support bases that are collapsible to make the base convenient to store and transport. The brackets includes safety latches that engage the tower in a fail safe manner to stop a bracket that may fall uncontrollably because of other equipment failure. Some of the safety latches may be rendered inoperable as the bracket is raised and lowered under power, but one safety latch remains operable at all times.

Abstract: A moveable walkway which can be raised or lowered by workmen on the walkway is provided. The walkway runs on rails affixed to the side of the structure and comprises a sliding member fitting within hollow rails, which sliding member is filled with wheels having projections thereon for interacting with perforations in said rails and locking devices for stabilizing the walkway at any given level.

Abstract: A rungless motorized ladder of a type having an elongated pole with a cable attached at the top thereof. At the bottom thereof, the cable is attached to a spool which is motorized. The spool is attached to a carriage having a place for receiving a person's feet. Foot controls are provided on such carriage for permitting persons utilizing the device to move the carriage up or down on the pole with a simple movement of one foot. Likewise, when the foot control is not being utilized, an automatic braking device is provided for holding the carriage securely in a stationary position.

Abstract: The invention relates to a furniture fitting having a grooved loop-shaped guideway for guiding an equipment supporting plate in a generally vertical direction and locking it in at least two positions at different elevations. Means are provided for preventing a guide pin from entering at least one of the two guideway branches from the undesired direction. The invention resides in the sections (28, 35, 40, 29, 51, 52, 48) of the grooved guideway being provided with steps having steeply rising surfaces (33, 38, 41, 43, 53), the pin end (32) moving in the grooved guideway being urged against the bottom of the groove by spring means (21, 62), and the rising surfaces of the steps forming stops for the pin end (32) in one direction of movement.

Abstract: A portable scaffold includes a base or chassis mounted on wheels for site-to-site towing or "man-handled" positioning at a job site. Rising rigidly from the chassis are two masts, spaced apart lengthwise of the chassis. A platform is vertically slidably carried by the mast for selective elevation and descent via power devices. Each mast may be increased in height by the addition thereto of a mast extension that functions as a prolongation of the basic mast. One of the power devices is alternately positionable to function as a temporary source of power for moving the scaffold through short distances. Strap elements are provided for temporarily bracing the masts from a structure being worked on by workmen on the platform.