The invention is concerned with a stiff flat girder which basically consists of a top- and a bottom chord (4a, 3b), compression members (ab) between and diagonal bracings (1a, 3a, 2b, 4b) in the spacings (a, b), in which both chords and all diagonal bracings are made of flexible cable/rope. It is preferred to let the main cables (1a, 1b; 2a, 2b; 3a, 3b; 4a, 4b) continue uninterrupted from one end (L) to the other (R) between the fixed supporting mountings (Lp, Rp; Lq, Rq), whereby the main cable...

A ratcheting pulley device is shown and described. In one embodiment, the device includes a sheave rotatably mounted in a housing. The housing defines an opening for ingress and egress of a rope or cord into the housing and around the sheave. The device includes a releasable ratchet mechanism, which, when engaged, permits rotation of the sheave in one direction but not the other, and which, when released, permits free rotation of the sheave. A loading-disk is mounted on the exterior of the housi...

To obtain a prestressed anchorage of wire ropes in concrete works, a barrel-shaped cylindrical anchoring socket is used in which preferably parallel through passages are formed, these passages being adapted to receive the wire rope strands of which the free projecting ends are secured to an anchoring head on which the tensioning traction is exerted until the socket can be fastened to the work. The strand or wire rope fastening to said anchoring head may be replaced by that of a screw-threaded ro...

A safety retainer for use in curtain controlling ropes comprises first and second housings which engage with each other, wherein the first and second housings include four holes formed on the tops thereof, and two of the holes are formed by combining two semicircle-shaped holes together, between the first and second housings are respectively disposed protrusions and recesses corresponding to each other, on the combined bottom surface of the first and second housings is arranged a bore, such that...

A hoisting system is disclosed which includes a hoisting drum around which two hoisting ropes are wound in respective hoist rope grooves. The hoisting ropes are secured to the hoisting drum at one end, and extend down to a suspended device, such as an elevator, or a crane hook. The hoisting drum also includes a cable groove, which is located between the two hoist rope grooves. An electrical cable is secured at one end to the hoist drum, is wound around the hoist drum in the cable groove, and ext...

A traction sheave for driving synthetic fiber ropes, preferably of an elevator installation, ensures a consistently good selected tractive capacity that is largely independent of external influences which reduce friction. At least part of the rope running surface on the traction sheave is provided with a selected roughness grade of N7 to N12. The selected roughness grade on the running surface is formed either by mechanical machining or by use of a suitable coating, preferably a plasma coating o...

Flexible concrete structures resemble elongated rope-like articles having an outer textile casing in the form of a mono-tubular body with a continuous inner bore filled with dry cementitious material. The concrete ropes are naturally permeable to water for controlled chemical hydration for maximizing structural values and load bearing properties. The flexible concrete ropes may be employed in a wide range of applications in masonry and cement construction, such as caulk filler between foundation...

This invention provides a method of making single-wall carbon nanotubes by laser vaporizing a mixture of carbon and one or more Group VIII transition metals. Single-wall carbon nanotubes preferentially form in the vapor and the one or more Group VIII transition metals catalyzed growth of the single-wall carbon nanotubes. In one embodiment of the invention, one or more single-wall carbon nanotubes are fixed in a high temperature zone so that the one or more Group VIII transition metals catalyze f...

Knife arrangement for a granulator for granulating plastic ropes with two draw-in rollers and a cutting rotor (9) cooperating with a counter-knife (2), and a striper (3) facing one of the draw-in rollers (11), whereby counter-knife (2) and striper (3) are mounted on a common support, whereby the striper (3) is arranged adjustably for adjustment of the distance between the striper (3) and the draw-in roller (11), and whereby the striper (3) has a support surface (6) for feeding the plastic ropes ...

An apparatus is provided for preventing sway of elevator ropes (7). The apparatus comprises a swing arm (2) positioned within a hoistway (6) of an elevator. The swing arm is movable between a first position and a second position wherein the swing arm is in proximity with the ropes in the first position and the ropes contact the swing arm thereby reducing sway and wherein the swing arm is positioned outside of the path of an elevator car (8) in a second position. An embodiment includes a sheath (...