TH27747B - Synthetic fiber rope - Google Patents

Abstract

DC60 (06/11/52) A synthetic rope with aramid strands of interstrands arranged in parallel on a tightly oriented strand, and an interstrand sheath with a surface modified to fit the outer profile of the adjacent strands. By positively bonding the inner and outer layers of the strands, higher torsional strength is achieved, as is the rope structure of the stranded rope, which is less susceptible to twisting. In addition, the flexible interstrand sheath between the strands is provided to protect the strands from abrasion and wear in the transmission of force and torque within the rope over a large area. With reference to a rope for pulling driven by a rope pulley, the covering layer of the strands (12) is arranged with the opposite strands on the parallel rope axis (9), and with the interstrand sheath (13) between the opposite strands (16,12) to improve the internal transmission of force, where such a sheath is proposed to have a modified surface of the sheath. The sheath between the strands of rope (13) is fitted to the outer profile of the adjacent layers of strands of rope (8,12). In this way, due to friction and the shape of the sheath, the sheath between the strands (13) transmits the forces and torques of the covering layer (12) to the core of the rope (9), and uniformity is achieved across the entire outer surface of the sheath. By bonding the inner and outer layers of the strands of rope, a higher torsional strength of the rope (1) is achieved.

Claims (6)

1. A rope to be driven by a winch pulley or drum shall consist of at least one concentric inner and outer layer of load-bearing synthetic fiber strands (2,4,7,10) that are arranged together and between the inner layer of the rope strands (5,8) and the outer layer of the rope strands (12) an interstrand sheath (13) of tubular shape which encloses the inner layer of the rope strands (5,8) is made such that the interstrand sheath (13) has a sheath surface which is adapted to the outer outline of the adjacent layers of the rope strands (8,12). 2. The rope according to claim 1 is made to be such that the coefficient of friction between the strands (4,7,10) and the sheath between the strands (13) shall be greater than 0.15. 3. The rope under claim 1 is made to have a specific characteristic such that the total expansion of the sheath between the strands of rope (13) is greater than the maximum movement of the strands of rope (4,7,10) relative to the other strand of rope. 4. The rope under claim 1 has been made in a specific manner in which the surface of the sheath is grooved. 5. The rope according to claim 1 is made to have a specific shape in which the groove (20) is helical in shape, the direction of the helix (11) on the outer surface of the sheath is opposite to the direction of the helix (3) of the groove (19) on the inner surface of the sheath. 6. The rope according to claim 1 is made to have a specific characteristic that the thickness s of the sheath (20) at the thinnest point of the sheath shall be 0.1 mm.