Abstract:
A rope with high stiffness and breaking strength is provided. The rope is produced by providing a stiff core (1) and fibre rope jacket (4) surrounding the core and by changing the phase condition of the core while stretching the rope, such that inside vacancies between the fibre rope jacket (4) and the core (1)are eliminated permanently. A method and apparatus for producing such rope are provided, wherein the core (1) is heated up and stretched such that it will be permanently elongated. In a preferred embodiment the thermoplastic core (1) changes from solid phase to liquid phase by means of heating. While in liquid phase the core material adapts to the encapsulating space of the surrounding sheet. The rope is then cooled down under tension until the core has returned to solid phase.
Abstract:
Endless rope (10) containing primary strands (12), the primary strands (12) containing laid-up secondary strands (14), the laid-up secondary strands (14) containing rope yarns (16), wherein the primary strands (12) have been laid up from 3,4 or 6 secondary strands (14), wherein the rope (10) contains a splice in at least every primary strand (12) and wherein the rope (10) preferably has been laid up from 3, 4 or (1+6) primary strands (12) or, alternatively, has been braided from 8 or 12 primary strands (12).
Abstract:
Mesh bars (35, 283) of a trawl (13, 263) include at least a portion having a corkscrew-shaped pitch which exhibits a hydrofoil-like effect. Such mesh bars (35, 283) are preferably formed from a material having a substantially incompressible cross-sectional shape. By appropriately selecting the lay and leading edge of mesh bars (35, 283), movement of the trawl (13, 263) through the water entrained environment creates a pressure differential and lift across that portion of mesh bars (25, 283) which exhibit the hydrofoil-like effect. The lift thus created increases performance characteristics of the trawl (13, 263) including increased trawl volume, improved trawl shape, and reduced vibration, noise, and drag. Obtaining the greatest improvement of trawls (13, 263) requires controlling a pitch range for twisted product strands (e.g. twisted ropes) (36, 37), and for straps (284) forming mesh bars (35, 283). For straps (284), control of a width to thickness ratio also significantly affects performance of the trawl (13, 263).
Abstract:
A method for creating a composite cable having at least one high-performance termination on at least one end. A high-performance termination is added to an end of a short synthetic tensile strength member. The strength of the tensile strength member and termination is then tested. Once tested satisfactorily, the short cable is spiced onto a long cable of the same type using prior art splicing technique's. The union of the short cable and the long cable creates a "composite" cable having a high-performance termination on at least one end. In most applications It is preferable to set the length of the short cable so that the interwoven splice will exist at a desired location.
Abstract:
A braided rope (10) includes a plurality of primary strands (12), and each of the primary strands (12) includes a plurality of fibers (16) which have a first coefficient of friction with itself. The rope (10) also includes a secondary strand resp. a core (14) surrounded by the plurality of primary strands (12). The secondary strand resp. core (14) includes a structurally-stable, non-flowable, material having a second coefficient of friction with the fibers (16) of the primary strands, wherein the second coefficient of friction is lower than the first coefficient of friction. The rope (10) may be of 12 x 12 braided construction and includes a core (14) for its length. The rope has reduced internal wear and therefore a longer service life and improved friction properties compared to braided ropes with a core, lubricated with flowable material. A method of constructing the rope is disclosed, too.
Abstract:
A rope structure is formed by forming a sub-rope structure comprising a core and a jacket, twisting the sub-rope structure to form a twisted sub-rope structure, and forming the rope structure by braiding together a plurality of lengths of the twisted sub-rope structure.
Abstract:
A product comprising a plurality of interlaced yarns wherein at least a first yarn having a tensile strength, having a value TS in N/tex, said first yarn containing a plurality of UHMWPE fibres having a titer, having a value T in den, wherein the ratio T/TS is at least 5 den.tex/N. The tensile strength is obtained by adjusting the drawing ratio or the UHMWPE filaments / fibres accordingly. The product shows resistance to abrasion. The product can be a rope or round slings, comprising a sheath / jacket comprising said first yarn.
Abstract:
A rope comprising polyethylene elongate elements oriented in the length direction of the rope wherein for at least part of the elongate elements the distance of the element to a central longitudinal rope axis varies over the length of the rope, the polyethylene elongate elements comprising tapes of ultra-high molecular weight polyethylene, the tapes having a width to thickness ratio of at least 10 and a polymer solvent content below 0.05 wt.%. The distance of at least part of the elements to the central longitudinal rope axis varies over the length of the rope between a longitudinal line which is at most 30% from the outside of the rope and a longitudinal line which is at most 30% from the central longitudinal axis of the rope. A rope with these properties, shows a high strength-strength ratio, defined as the ratio between the strength under use conditions and the fresh strength of the rope. A strength-strength ratio of at least 50%, preferably at least 70%, in particular at least 80% can be achieved.
Abstract:
A cable or rope (10-1; 10-2), of the composite type, comprising: a inner metallic rope or core (10-A), consisting of a plurality of metal strands (10-A'), and a plurality of covering layers formed around the inner metallic core (10-A), wherein the covering layers comprise a first layer (10-B) of Kevlar formed around the inner metallic core (10-A), and a second layer (10-C) of polyester that is formed around and covers the first layer (10-B) of Kevlar, and wherein the first and the second coating layer, respectively Kevlar and polyester, are made with a fabric of braided yarns, or, according to a further embodiment (10-2) of the composite cable, the covering layers comprise a further third layer (10-C), of Kevlar and/or Dyneema, which is formed around and covers the second layer (10-C) of polyester, in turn formed and arranged around the first layer (10-B) of Kevlar. The cable or rope of the invention substantially innovates over the known conventional cables. The invention also relates to an innovative anchoring and safety system (20), based on the use of a rope and directed to put in safety roofs (RO) and the roofing of buildings against accidental falls from an height of the people working on them, comprising one or more anchorages (21), fixed to the roof (TE) to make safe and sure, in each of which the rope (E) is stably locked by screwing, so as not to create problems of instability for the people that is attached to the rope.
Abstract:
In the method according to the invention in the manufacture of an elevator the following procedures are performed, -a movable supporting platform (4) and an elevator car (2), and possibly a counterweight (CW), are installed in the elevator hoistway (1), -the rope installation is performed, in which the elevator is reeved to comprise construction-time hoisting roping (3,3'), and the hoisting roping (3,3') is arranged to support the elevator car (2) resting on the supporting platform (4) supported in its position above the elevator car (2), -the elevator car (2) is taken into use to serve passengers and/or to transport goods, -the elevator car (2) is removed from the aforementioned use, - the service range of the elevator car is changed to reach higher up in the elevator hoistway (1) by lifting the supporting platform higher up in the elevator hoistway with hoisting means (22,30), -the elevator car (2) is taken back into the aforementioned use. In the aforementioned rope installation the elevator is reeved to comprise construction-time hoisting roping (3,3')/ which comprises one or more ropes, the longitudinal power transmission capacity of which is based at least essentially on non-metallic fibers in the longitudinal direction of the rope. In the method guide rails (G) to be fixed with guide rail brackets (b) can additionally be installed by the aid of installation means (8,9). The invention also relates to an elevator arrangement, with which the aforementioned method can be performed.