A modular block has lad wye plates configured on opposing sides of the block that carry the load from an axle fastener to load fasteners coupled to the eye. This configuration of the load wye plates enables the other components, including contact surface components such as the sheave, sheave wheel, side plates and bushings to be made of lower weight materials, such as polymers thereby increase the load to weight ratio of the modular block. Ultrahigh molecular weight polyethylene (UHMWPE) is a preferred material for the contact components and high load capacities are realized with these polymeric components used in conjunction with the load wye plates. Also, the use of non-sparking polymeric or composite materials is required in some applications to prevent fire or combustion.
B66D 3/04 - Moufles ou dispositifs similaires dans lesquels la force est appliquée à une corde, un câble ou une chaîne qui passe sur une ou plusieurs poulies, p. ex. pour obtenir une démultiplication
A modular block has lad wye plates configured on opposing sides of the block that carry the load from an axle fastener to load fasteners coupled to the eye. This configuration of the load wye plates enables the other components, including contact surface components such as the sheave, sheave wheel, side plates and bushings to be made of lower weight materials, such as polymers thereby increase the load to weight ratio of the modular block. Ultrahigh molecular weight polyethylene (UHMWPE) is a preferred material for the contact components and high load capacities are realized with these polymeric components used in conjunction with the load wye plates. Also, the use of non-sparking polymeric or composite materials is required in some applications to prevent fire or combustion.
B66D 3/04 - Moufles ou dispositifs similaires dans lesquels la force est appliquée à une corde, un câble ou une chaîne qui passe sur une ou plusieurs poulies, p. ex. pour obtenir une démultiplication
B66D 3/16 - Dispositifs à chaînes ou à éléments similaires manœuvrés manuellement, avec ou sans mécanisme de transmission entre l'organe de manœuvre et la corde, la chaîne ou le câble de hissage actionnés par une chaîne sans fin passant sur une poulie ou un pignon denté
A seine net assembly utilizes buoyant seine net purse rings that float above the leadline and therefore reduce the risk of the purse rings getting snagged on the bottom of the body of water. An exemplary buoyant purse ring may have a specific gravity less than 1.0 and preferably, between 0.08 and 0.96. It is desirable that the purse rings float but not be so buoyant that they cause the leadline and therefore the leadline end of the net to float. An exemplary purse ring is made out of a polymeric material such as polyethylene and most preferably ultra-high molecular weight polyethylene (UHMWPE). A polymeric purse ring may have a ring wall with a rectangular shape designed for durability and tighter packing. The width of the ring wall may be greater than the thickness.
A processing roll has a release layer that includes a porous rigid layer and polymer composite. The porous rigid layer may be a thermally sprayed metal that has discrete metal portions or a network of contiguous metal portions. Discrete metal from a flame sprayer may attached to each other on a contact surface to form the rigid layer. The polymer composite at least partially fills the spaces between the metal portions. The polymer composite may comprise a particulate filler, such as silica or glass beads. The release layer has good durability as the exposed surface contains both a portion that is the rigid material and a portion that is the polymer composite. This configuration enables very high release and long term durability even as the release layer wears.
A marine deck structure for rope contact having an impermeable cover for the purpose of preventing chaffing and wear of ropes is disclosed. Provided is a marine deck structure, such as a bullnose, or H-Bit covered with a durable impermeable cover that protects the structure from the harsh elements and provides a smooth low abrading surface. In another embodiment, rope chaffing surfaces on a marine vessel or dock are covered with an impermeable cover to reduce rope wear. The impermeable cover in one embodiment comprises ultra high molecular weight polyethylene (UHMWPE). A number of ways of covering the marine deck structures are provided, such as positioning cover sheets around or on the support member and attaching the cover by, for example, welding, adhering, or thermally shrinking.
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