Abstract: A single, telescopic tubular steel pole is supported by an elongated steel channel base having rubber wheels on each end. The pole is leaned and supported against the top of a door opening in a building by means of a removable top frame having a longitudinal angle steel member reinforced by diagonal struts on other angle iron members which form a longitudinal channel welded to the top of the pole. A winch system employs a cable which passes around two pulleys on the top member to support a heavy steel, folding door.

Abstract: The hoist system of the instant invention is intended for use with an overhead support and includes an elongate bar disposed below the overhead support and extending in a generally horizontal direction. A lifting device is attached adjacent opposed ends of the bar for connecting the bar to the object to be lifted. At least one intermediate pulley is attached to an upper side of the bar intermediate the ends thereof. A fastening mechanism cooperating with the overhead support for affixing the system to the support is provided which includes a downwardly extending pulley. A winch mechanism is mounted on the bar and includes at least cable having one end thereof affixed to the bar and trained, serially, over the fastening mechanism pulley and under the intermediate pulley while the other end of the cable is secured to the winch mechanism. The winch mechanism is operable to lift the bar and the object connected thereto.

Abstract: For raising and lowering theatre scenery there is a horizontal track in the fly loft of the theatre, and several carriages, slidable along the track, are shiftable to any desired positions along the track, positions being chosen in accordance with possibly uneven or non-uniform weight distribution in the scenery to be handled. A series of cables, one for each carriage, runs from a common winding drum to one end of the track and then to an anchorage at the opposite end of the track. Each cable runs over two pulleys of its own individual carriage, and forms a downwardly extending loop between these two pulleys. A pulley block rides on each loop. All the pulley blocks are ordinarily connected to a scenery batten, from which the scenery is hung, but when specially required, individual pulley blocks may be used separately.

Abstract: A heavy duty drilling mast or derrick made of a plurality of elements which telescope one into another so that the derrick can be raised from a collapsed position to an extended position with vertical axis by means of a plurality of four cables--one in each corner of the derrick. Each element is a rectangular box with open top and bottom, and each element can be locked to its upper and lower neighbors in the extended position so as to provide a strong, rigid derrick for drilling deep wells. Each element can be removed from the assembly and carried by helicopter from one location to another.

Abstract: An elevator system has a selector mechanism driven by a cable loop attached to the elevator car. The opposite cable ends are wound on a take-up drum, in opposite rotational directions, in sequential rows across the drum, such that the cable leads travel back and forth across the drum as the drum rotates. A selector cable guide includes a frame pivotable about an axis generally perpendicular to the drum axis. The frame is disposed about the drum, and has a pair of pulleys mounted adjacent to the pivot axis, and a second pair of pulleys mounted to the frame on the opposite side of the drum. Each cable portion is guided about one of the first pulleys, thereafter about one of the second pulleys, and is thereafter wrapped onto the drum. The second pulleys swing laterally to follow the position of the cable leads as they travel across the drum, whereas the first pulleys remain relatively stationary for directing the cable portions up and down the elevator shaft from a relatively constant position.

Abstract: A wireline guide for use in oil-well industry has three arms, each of which is made of parallel elongated trusses with support plates attached between the trusses. The first, lower arm is fixedly attached at 45.degree. angle to a collar of a pack-off assembly, the second arm is swivelly attached at its lower end at 45.degree. angle to the upper portion of the first arm, the second hand having a first pulley wheel rotatably mounted between the trusses at the upper portion of the second arm. A bumper is integrally mounted to the upper portion of the second arm in order to prevent contact between a travelling block and the wireline. The lowermost pair of support plates attached to the swivel arm are mounted at 45.degree. angle in relation to the trusses. A third, removable arm is mounted at its lower end between the angular support plates and extends vertically upwardly from the second arm. The uppermost reinforcing plates of the third arm are mounted at 45.degree.

Abstract: This invention relates to drilling rigs, and more particularly to novel apparatus for supporting a plurality of pairs of block and tackle systems with the tackle systems of each pair operable sequentially and alternately, the one being used to support a main drilling or tubing string while the other is being used to rack stands of tubing therefrom.

Abstract: When a hoist is used to elevate a grain truck for dumping same, at an elevator terminal or the like, a pair of lift cables extend from the overhead hoist assembly to the cradle upon which the front wheels of the truck are engaged. As the truck is lowered after emptying the grain therefrom, the slack cables often foul the truck as it is being driven from the cradle. In the present device, each cable passes through a spring loaded arm normally urging the cables outwardly away from the sides of the truck thereby clearing same, but which are aligned against the spring pressure as soon as the lifting load is applied so that the cables run vertically from the hoist assembly.

Abstract: Well tubing handling apparatus useful for running and pulling tubing in a well bore and drilling a well bore including a main frame assembly, a pulling and snubbing assembly, a ladder assembly, and a work platform assembly. The apparatus is quickly assembled and torn down. The main frame assembly includes a base, telescoping non-load bearing guide tubes, a load-bearing mast, fixed slips, and winches and sheave and cable assemblies for manipulating pipe joints between handling positions in the apparatus and a pipe rack. The pulling and snubbing assembly includes a hydraulic cylinder connectible at the free end of the piston on the frame base, sheave mounted drive cables secured on the cylinder, traveling slips mounted on the drive cables, and an anchor between the drive cables and the main frame so that as the cylinder is raised and lowered the cables are driven around pulleys raising and lowering the traveling slips.