Abstract: A pulley block may include an alpha pulley block including an alpha connector, a beta pulley block including a beta connector, wherein the alpha pulley block is coupled to the beta pulley block when the alpha connector is coupled to the beta connector. At least one of the alpha connector and the beta connector may comprise magnets.

Abstract: Disclosed is a modular sheave unit including: a bearing that includes an outer race, an inner race and one or more rolling elements therebetween; and a sleeve that includes one or both of: an outer sleeve axially surrounding the outer race, the outer sleeve including an outer surface defining a groove, the groove configured to receive a belt; and an inner sleeve axially surrounded by the inner race and disposed between the inner race and a mandrel.

Abstract: A rope wheel assembly of an elevator includes a frame, a plurality of rope wheels for guiding ropes of the elevator, and a plurality of bearings. The rope wheels are mounted coaxially on the frame such that they are rotatable relative to the frame as well as relative to each other. The rope wheel assembly includes a central shaft passing through the rope wheels, which central shaft is non-rotatable relative to the frame, and the rope wheel assembly includes a hollow cylinder surrounding the central shaft, the hollow cylinder being mounted on the central shaft rotatably relative to the central shaft, each said rope wheel being mounted on the cylinder rotatably relative to the cylinder. The rope wheel assembly includes a bearing axially between rope wheels that are next to each other via which bearing they are supported on each other in axial direction. A compensator and an elevator arrangement implementing the rope wheel assembly are also disclosed.

Abstract: A trench roller lifting adapter is for inserting/removing a trench roller into/from a trench absent intervention with the trench roller within the trench by a worker and saves time required for compacting dirt in the trench. The adapter has an upper portion configured for interaction with a hook attached to a cable dangling from a crane, excavator, tractor, or other type of construction equipment used to insert/remove the trench roller into/from a trench. The upper portion has a front portion and an opposed back portion with a pin and gap extending therebetween. Each of the front and back portions include respective guide members adapted for guiding the hook toward and into engagement with the pin. The adapter also has a lower portion depending from the upper portion that is configured for secure coupling to the trench roller to be moved into or out of the trench.

Abstract: A pulley suspension assembly for assisting a user to vertically transport a cable to an elevated location may include a base member adapted to be positioned at the elevated location. A plurality of prongs may be statically coupled the base, extended upwardly therefrom, and seated adjacent to a rear edge thereof. A rectilinear guide rail may be statically mated to the prongs and spanned therebetween. Additionally, a plurality of stabilizing brackets may be statically affixed to the top surface and front of the base member. Further, a rectilinear shaft may be connected to the brackets and spanned therebetween. A plurality of pulleys may be journaled about the rectilinear shaft and rotatable thereabout. Such pulleys may be uniformly juxtaposed side-by-side and freely reciprocated along the shaft while rotating about the fulcrum axis. Anchor cables may be included and engaged with the prongs and an existing support surface at the elevated location.

Abstract: Process for preparing an alkoxypolyoxyalkylene (meth)acrylate in which a) a metal alkoxide MetOR10 is initially charged, b) an alkylene oxide of the formula (IV) is added and reacted with the metal alkoxide and c) (meth)acrylic anhydride is added directly and reacted with the reaction product from step b). Appropriately, in step c), a stabilizer mixture is added which comprises, for example, the following components I. at least one compound of the formula (I) II. at least one compound of the formula (IIa or IIb) or of the formula (IV) III.

Abstract: A sheave block for use with a wireline includes first and second opposing walls and a shaft extending therebetween. At least one grooved sheave is disposed on the shaft, each sheave being engageable with the wireline. At least one retractable sheave guard is movably connected to the first and second opposing walls and is moveable between open and closed positions, the open position allowing the wireline to be rereeved around at least one of the grooved sheaves without entirely removing the wireline from the sheave block.

Abstract: A crane boom top is disclosed in which a sheave assembly having a number of sheave sets is supported on the crane boom top by boom sheave supports. Each sheave set is mounted on an individual shaft and connectors connect the individual shafts to the boom sheave supports.

Abstract: A load block having a body, a sheave rotatably positioned within the body, and a hook having a shank received within the body and having a portion positioned in a generally air-tight volume within the body. The body includes a first side plate, a second side plate in generally parallel relationship to the first side plate, and a crossblock affixed to and extending between the first and second side plates. The air-tight volume is formed within the crossblock. The crossblock includes a cover which is affixed to a top surface of the crossblock and is in generally liquid-tight relationship to the crossblock. A liquid fills the volume of the crossblock so as to extend around a portion of the shank. The cover has a check valve positioned on a surface for allowing air to pass from the volume and for preventing air from passing into the volume. The sheave includes an inner race around a bearing assembly adjacent to a shaft formed in the body. A pair of dead-eyes are positioned on opposite sides of the body.

Abstract: An apparatus for detecting the focus state of an optical system has optical apparatus for forming first and second light distributions of an object. The relative positional relationship of the light distributions varies in accordance with the focus state of the optical system. A light receiving device has first and second ranges, each having a plurality of picture elements. The first and second ranges respectively receive the first and second light distributions. Operation circuitry manipulates the output signals from the first and second ranges by relatively mathematically moving them to calculate a value representing the focus state of the optical system. The operation circuitry selectively executes a first operation in which the number of signals corresponding to each other is varied, and a second operation in which the number of signals corresponding to each other is kept constant.

Abstract: Interposed between the driving shaft of the tackle and the hoisting hook of the tackle is a flat textile strap or a flat metal braid. The strap or braid is attached to the drum of a drum-pulley keyed on the driving shaft at the end of the strap or braid. The strap passes around the pulleys of a pulley-block comprising an upper block mounted on the frame of the tackle to pivot about a horizontal axis X-X, and a lower block suspended from the strap or braid and carrying the hook.

Abstract: A truck mounted hydraulic cable reel apparatus for heavy power cable includes bed frame members supporting a circular turntable. A motor rotates the turntable 45.degree. to either side of a longitudinal center line. Two vertical stanchions are mounted on the turntable. One stanchion supports a tail stock assembly, and a second supports a reel drive assembly. The drive assembly includes a reel drive shaft connected at one end to a hydraulic motor and having a reel drive face plate on the other end. The face plate has lugs which engage lugs on an end of the cable reel spool shaft. The hydraulic motor reversely rotates the cable spool to wind in or pay out power cable. Vertical guide rollers are disposed at either end of the horizontal cable roller. Telescoping outrigger booms are adjustably positioned on either side of the bed frame. Multiple guide rollers on the ends of the booms open and lock closed to capture the power cable and to act as outriggers when laying or retrieving cable.