Abstract: A mobile tower drive system for efficiently attaching a removable drive system to a scaffolding unit and driving the scaffolding unit from the work platform. The mobile tower drive system generally includes a lower unit adapted to be secured to a lower end of a scaffolding unit, wherein the lower unit has a wheel to operably engage a floor surface and move between an engaged and disengaged position. The lower unit removably attaches to an upper unit, wherein the upper unit is secured relative the upper frame of the scaffolding unit. Both, the lower unit and the upper unit employ coaxial drives for turning and driving the wheel. The coaxial drive also is used to brake the wheel. The coaxial drives are generally controlled via manually operable rotational control levers; however automated power sources may be utilized. Also disclosed are swivel locks for the caster wheels of the scaffolding unit.

Abstract: A split tube connector for efficiently connecting separate tubular members together. The split tube connector generally includes a first tubular member, a second tubular member separate from the first tubular member and a connector assembly including a first connector and a second connector connected to the first connector, wherein a first end of the connector assembly is removably positioned within the first tubular member and wherein a second end of the connector assembly is removably positioned with the second tubular member. The first connector and the second connector laterally adjust to engage a first inner surface of the first tubular member and a second inner surface of the second tubular member to frictionally connect the first tubular member to the second tubular member via the connector assembly.

Abstract: A door installation system for safely installing or removing a heavy door by a single person. The door installation system generally includes a base, a vertical member extending from the base in an upward manner, a brace member extending between the base and the vertical member, a guide structure attached to the upper portion of the vertical member for guiding an upper portion of a door, and a carriage removably attachable to the base. The carriage is capable of adjusting the attitude of a door being installed to fit within a door jamb. The vertical member and the base are pivotally connected to one another to allow for folding into a compact structure.

Abstract: A connecting structure detachably connects the upright post of a floor support to the upright frame supporting a panel lift device. The upright post has a pair of upright panels diverging forward to form a V shaped flange that has its lower portion open in front and a rounded knob mounted at the bottom of the post and spaced forward from the forward diverging V shaped flange. The post also has a pair of upright panels converging forward with upper portions of the panels tapering toward one another to form a pointed V shaped upper end. The frame has a forward diverging V shaped flange with an upper portion having dual pair of forward converging flanges in spaced relation to one another to form a forward converging V shaped slot.

Abstract: A two-way drywall lift overload protection system for reliably preventing the application of an overloading input force or an overloading weight force from an elevated load. The two-way drywall lift overload protection system generally includes a telescoping drywall lifter to lift and lower a load, wherein said telescoping drywall lifter includes a plurality of legs, a lower lifting member, a plurality of telescoping lifting members extending upwardly from said lower lifting member and an upper support, a winch attached to said telescoping drywall lifter, a brake unit connected to said winch, a slip clutch mechanically connected to said telescoping drywall lifter to selectively extend and retract said lower lifting member and said plurality of telescoping lifting members, and a main elongated member connected between said winch and said slip clutch.

Abstract: A two-way drywall lift overload protection system for reliably preventing the application of an overloading input force or an overloading weight force from an elevated load. The two-way drywall lift overload protection system generally includes a telescoping drywall lifter to lift and lower a load, wherein said telescoping drywall lifter includes a plurality of legs, a lower lifting member, a plurality of telescoping lifting members extending upwardly from said lower lifting member and an upper support, a winch attached to said telescoping drywall lifter, a brake unit connected to said winch, a slip clutch mechanically connected to said telescoping drywall lifter to selectively extend and retract said lower lifting member and said plurality of telescoping lifting members, and a main elongated member connected between said winch and said slip clutch.

Abstract: A multi-stage drywall hydraulic lift system for efficiently lifting a drywall panel while providing increased precision in positioning of the drywall panel. The multi-stage drywall hydraulic lift system generally includes a telescoping drywall lifter, a hydraulic actuator connected to the telescoping drywall lifter to extend and retract the telescoping drywall lifter. A hydraulic pump is fluidly connected to the hydraulic actuator. A valve unit is fluidly positioned between the hydraulic pump and the hydraulic actuator to control the flow of fluid to the hydraulic actuator based upon a desired vertical lift velocity.

Abstract: The invention comprises a lift device having base with a detachable upright tubular pole, a lifting apparatus adjustably mounted on said pole for lifting various objects upward and downward on said pole, said base having a upright post to be received in said tubular pole with expandable means in said post to expand to engage the inner surfaces of said pole to achieve a rigid connection between said post of said base and said pole to enable said base and said pole to be rigidly secure when operating said lifting apparatus on said pole.

Abstract: The invention comprises a door attaching apparatus for positioning and aligning a door for attachment to a doorway. The apparatus has a mobile frame adapted to be moved upon a surface. The mobile frame has a first frame. The first frame is movably mounted to the mobile frame to move upward and downward and forward and rearward relative to the mobile frame with a door mounted thereon. A second frame is pivotably mounted to the mobile frame behind the first frame and is handle operated to move forward and rearward on the mobile frame and to engage the first frame to cause the first frame and door thereon to move forward and rearward with the second frame to align the door in a doorway in one direction for attachment of the door to the doorways. A handle operated cam mechanism is mounted between the first and second frames to cam the first frame and thereby the door upward and downward on the mobile frame align the door in another direction for its attachment to the doorway.

Abstract: The invention comprises a door attaching apparatus for positioning and aligning a door for attachment to a doorway. The apparatus has a mobile frame adapted to be moved upon a surface. The mobile frame has a first frame. The first frame is movably mounted to the mobile frame to move upward and downward and forward and rearward relative to the mobile frame with a door mounted thereon. A second frame is pivotably mounted to the mobile frame behind the first frame and is handle operated to move forward and rearward on the mobile frame and to engage the first frame to cause the first frame and door thereon to move forward and rearward with the second frame to align the door in a doorway in one direction for attachment of the door to the doorways. A handle operated cam mechanism is mounted between the first and second frames to cam the first frame and thereby the door upward and downward on the mobile frame align the door in another direction for its attachment to the doorway .

Abstract: The invention comprises a portable drywall roller device. The device has aframe with a horizontal plate and a horizontal groove across the plate for receiving the lower edge of the a drywall panel. The device has a pair of wheels with one wheel mounted on a rotatable caster mechanism on one side of the device and another wheel rotatably mounted on a horizontal axis extending across the device toward the caster wheel. A sleeve is fixed to the plate and extends upward therefrom. A rod is slidably mounted in the sleeve and has a pair of legs at its lower end which are adapted to engage the ground, one on each side of the horizontal axis extending across the device to provide a lateral ground support for the two wheels. The rod has a forward extending hook at its upper end for mounting over the top of the drywall panel when the bottom of the drywall panel is in the horizontal groove to lock the drywall panel to the device.

Abstract: The invention comprises a collapsible panel carrying stick having a dual pair of elongated stick sections adapted to be extended into end to end relation with one another. The lowermost stick section has a projecting flange for insertion beneath a panel such as a dry wall panel. The uppermost stick section has a handle for carrying the stick with the panel thereon. The upper two stick sections are slidably retractable toward one another and the lower two sections are slidably retractable toward one another. The middle two stick sections are pivotally connected to one another to pivot toward one another with the sections retracted to collapse the stick sections into a smaller compact position for easier carrying.

Abstract: The invention comprises a turntable device for an apparatus having a pair of vertically adjustable work platforms with crosswalk between the platforms at the tops of the platforms, with a turntable device for each end of the crosswalk. The turntable device has a rectangular base with clamps for detachably mounting the base to the top of the platform, and a U shaped bracket pivotally mounted about a vertical axis on the base.

Abstract: The invention comprises a bulk drywall rolling support device. The device has a near horizontal frame with its forward end inclined upward in relation to its rearward end. The frame has a pair of beams on each side with a lateral bar fixed between the beams. A pair of upward extending sleeves are mounted on the outside of each beam. A pair of rods are adapted to be slidably inserted into the sleeves and extend upward and slightly rearward therefrom. The device has four wheels mounted at the comers of the device. Each rod has a handle near it's upper portion for grasping by an operator for rolling the support device about on its wheels. The device is adapted to receive drywall panels with the lower edge of the panels resting onto forward and upward inclined beams and the rear sides of the panels resting against the rods.

Abstract: The invention comprises a portable panel lifting and transporting device. The device has an elongated stick which is intended to be placed in an upright position. A channel member is mounted to the bottom of the stick and has a U shaped apex at its bottom and opposing inner and outer sides with the inner side formed in a triangular shape and fixed to the bottom of the stick and with the outside edge adapted to receive the bottom edge of a drywall panel whereby the bottom edge may rest in the apex bottom of the channel member. A pair of wheels in line with one another are mounted on the triangular side of the channel member for rotatably supporting the device and a handle is mounted to an upper portion of the stick for an operator to grasp and move the device along the ground on its rollers with a drywall panel resting in the channel member.

Abstract: The invention comprises a panel lift apparatus for detachably mounting to a conventional drywall lifter for raising a drywall panel, from immediately adjacent the ground, to the lifting arms of the lifter for transfer of the panel to the lifting arms of the lifter. The apparatus has a main frame for attachment to the main frame of the lifter, with a pivotally mounted channel member pivotally mounted for pivoting adjacent the lifter for storage, and pivoted to a spaced away position for operation. The channel member has a lifting plate for movement down along the channel to a position immediately adjacent the ground for receiving a drywall panel thereon. A cable is attached to the lifting plate at its one end and a drum at its other end and a wheel is mounted to the drum to rotate the drum to wind the cable onto the drum to raise the lifting plate in the channel to thereby raise the panel thereon to the lifting arms of the lifter.

Abstract: The invention comprises a lifting apparatus having a mobile housing with three telescoping sleeves slidably mounted in one another and in said housing to slide upward in telescoping relation out of said housing. The housing has a hydraulic piston and cylinder mounted upright in the housing, with the piston fixed to the housing and the cylinder is hydraulically actuatable to telescope upward in the housing relative to the piston. Rollers are mounted to the top of the cylinder and the first two of the sleeves. A first chain has one end mounted below the roller on the cylinder and its other end mounted to the lower end of the first of the sleeves. A second chain is mounted to the housing below the roller on the first sleeve and its other end mounted on the other side of the roller to the lower end of the second sleeve.

Abstract: The invention comprises a panel lifting apparatus having a U shaped horizontal frame with rollers mounted along the bottom for transporting the frame from place to place. A pair of inclined channels are mounted in spaced relation along the apex of the frame. A pair of hooks having rod like extensions are each mounted on a frame having rollers for rolling along the inclined channels to roll the hooks upward and downward along the inclined channels. A crank and drum are rotatably mounted on one of said channels. A cable has its ends attached to the pair of hooks and an intermediate portion extending through the drum whereby rotation of the drum by the crank in one direction causes the cables to wind in opposite directions on the same drum to wind the ends of the cables upward simultaneously and thereby draw the hooks upward on the channels simultaneously.

Abstract: The invention comprises a panel lifting apparatus having at least three telescoping elongated sections telescoping into one another and all telescoping into a non-telescoping elongated frame member. Three separate chain length segaments not directly connected to one another act to raise and lower the telescoping sections. The first chain segament has its upper and lower end mounted to the upper and lower end of the first telescoping section. The second chain segament has its upper end connected to the upper end of the non-telescoping section and its lower end connected to the lower end of the second telescoping section. The third chain segament has its upper end connected to the upper end of the first telescoping section and its lower end connected to the lower end of the third telescoping section. The non-telescoping section has a gear drive with its output gear engaging the first chain segament to raise and lower the first chain segament to thereby raise and lower the first telescoping section.