Abstract:
A laminated printing blanket having compressible and resilient properties, and a method for its production. The compressible characteristics are provided by disposing a compressibleintermediate layer (24) having voids (30), between a base ply (28) and a surface layer (20). The voids (30) in the intermediate layer (24) are produced by dispersing a blowing agent in an elastomer, sandwiching the elastomer which contains the blowing agent between two fabric layers (22, 26), and activating the blowing agent to produce voids. By activating the blowing agent before disposing the intermediate layer (24) between the base ply (28) and the surface layer (20), the gases from the blowing agent are prevented from migrating to the base ply (28) or to the surface layer (20).
Abstract:
The belt construction (23) comprises an endless flexible band unit (24), and a plurality of belt elements (25) which are carried by the band unit in sliding relation therewith. Each belt element (25) has a slot arrangement (32) for receiving the band unit (24) therein, and has opposed faces (26, 27) which are disposed in compressed relation against adjacent faces of adjacent belt elements. Each belt element (25) is formed substantially solely from a high performance polymeric material that has high heat resistance, high compressive modulus, high toughness, and high strength.
Abstract:
The method comprises the steps of providing a grooved drum (41), disposing the tensile unit (13) about said drum, then disposing the first polymeric material (16), in a non-cured form thereof about the tensile unit (13), then subjecting the drum (41) to heat and pressure to cause the first material (16) to be forced toward the drum (41) and exude through the tensile unit (13) adjacent the grooves (42) and into the grooves (42) to at least partially form the teeth (14), then substantially immediately cooling the first material (16) and the drum (41) to stop the curing of the first material so that the first material is generally in a non-cured condition, then disposing the second material (21) in a non-cured form thereof about the tensile unit (13), and then again subjecting the drum (41) to heat and pressure to cause the first (16) and second (21) material to be forced toward the drum (41) and to be cured together (10).
Abstract:
The method comprises the steps of providing a grooved drum (41), disposing the first polymeric material (16) in a non-cured form thereof about the drum (41), then subjecting the drum (41) to heat and pressure to cause the first material (16) to be forced toward the drum (41) and to exude into the grooves (42) to at least partially form the teeth (14), then substantially immediately cooling the first material (16) and the drum (41) to stop the curing of the first material (16) so that the first material is generally in a non-cured condition, then disposing the second material (21) in a non-cured form thereof about the first material (16) on the drum (41), and then again subjecting the drum to heat and pressure to cause the first and second material to be forced toward the drum (41) to complete any remaining unfinished portion of the teeth (14) and to be cured together.
Abstract:
A tensioner for a power transmission belt that is adapted to be operated in an endless path, and a method of making the same. The tensioner comprises a support unit (36, 41) for being fixed relative to the belt (21), a belt engaging unit (38) carried by the support unit (36, 41) and movable relative thereto, a mechanical spring unit (39) operatively associated with the support unit (36, 41) and the belt engaging unit (38) for urging the belt engaging unit (38) relative to the support unit (36, 41) and against the belt (21) with a force to tension the belt, and a fluid dampening unit (40) operatively associated with the support unit (36, 41) and the belt engaging unit (38) to dampen the movement of the belt engaging unit (38) relative to the support unit (36, 41) in at least one direction of movement thereof. The fluid dampening unit (40) comprises a rotary dampening unit. The rotary dampening unit (40) and the spring unit (39) are coaxially aligned. The support unit (36, 41) has an opening (42) passing therethrough for receiving a fastening member (43) that will fasten the support unit (36, 41) to a vehicle bracket (37) or the like. The opening (42) is disposed coaxially through the rotary dampening unit (40) and the spring unit (39).
Abstract:
Un dispositif de tension (22) pour une courroie de transmission de puissance (21) adaptée pour fonctionner dans un chemin sans fin, une pièce pour ce dispositif, et des procédés de fabrication sont décrits. Le dispositif de tension (22) comprend une unité de support (36) fixée par rapport à la courroie (21), une unité d'engagement de la courroie (38) portée par l'unité de support (36) et mobile par rapport à cette dernière, une unité à ressort mécanique (39) effectivement associée à l'unité de support (36) et à l'unité d'engagement de la courroie (38) pour pousser l'unité d'engagement de la courroie (38) par rapport à l'unité de support (36) et contre la courroie (21) avec une force de tension de la courroie (21), et une unité à fluide d'amortissement (40) effectivement associée avec l'unité de support (36) et avec l'unité d'engagement de la courroie (38) pour amortir le mouvement de l'unité d'engagement de la courroie (38) par rapport à l'unité de support (36) dans au moins une direction de déplacement. L'unité à ressorts mécanique (39) peut comprendre une paire de ressorts (79, 79A, 79B, 79C) disposés en relation d'espacement sensiblement parallèle, l'unité à fluide d'amortissement (40, 40A, 40B, 40C) ayant au moins une partie disposée entre les ressorts et en relation sensiblement parallèle avec ces derniers. L'unité d'engagement de la courroie (38C) et l'unité de support (36C) peuvent avoir un agencement à rainure et languette (200) pour assurer un mouvement de glissement entre les deux. L'unité à fluide d'amortissement (40, 40A, 40C) peut comprendre un agencement à pistons (85, 147, 233) et à cylindres (84, 135, 217). Dans une variante, l'unité à fluide d'amortissement (40B, 40D, 40E) peut comprendre un agencement d'amortissement rotatif.
Abstract:
The combination of a toothed pulley (21, 21A) and a toothed belt (23, 23A), and the method of making the same. The toothed belt has teeth (31, 31A) that serially mesh with pulley cavities (25, 25A) that are respectively disposed between adjacent teeth (24, 24A) thereof. Each belt tooth (31, 31A) has a longitudinal cross-sectional configuration that defines a pair of spaced side faces (37, 37A) that respectively have free end portions (49, 49A) thereof that are remote from adjacent roots (39, 39A) thereof. The teeth (24, 24A) of the pulley (21, 21A) and the teeth (31, 31A) of the belt (23, 23A) are constructed and arranged in such a way that each belt tooth (31, 31A) would have the pair of free end portions (49, 49A) thereof compressed radially outwardly and inwardly toward each other by the respective adjacent pulley teeth (24, 24A) if that belt tooth (31, 31A) is fully received in the cavity (25, 25A) between those respective adjacent pulley teeth (24, 24A), and those respective adjacent pulley teeth are just making contact with the land areas (36) of the belt on each side of that belt tooth while being spaced from the respective roots (39, 39A) of that belt tooth.
Abstract:
The belt construction (10) comprises: a tensile member (13) intermediate the opposed sides (11, 12) of the belt construction; a plurality of teeth (14) defining one (12) of the opposed sides of the belt construction and being mainly formed of a first polymeric material (16) that has reinforcing fibers (17) therein, each tooth (14) having opposed sides (18, 19) that are disposed in spaced relation to adjacent sides of adjacent teeth, the belt construction having a land area (20) between adjacent teeth; and a backing member (15) defining the other (11) of the opposed sides of the belt construction, the backing member being mainly formed from a second polymeric material (21) that is initially separate from the material (16) of the teeth and is substantially free of fibers therein, the material of the backing member (15) having a surface (22) that joins with a surface (23) of each tooth (14), whereby the joining surfaces define an interface line (24) therebetween, the interface line for each tooth extending from the tensile member (13) at a point (26) inboard of one (18) of the opposed sides of the respective tooth into the medial portion (27) of the respective tooth and then back to the tensile member (13) at a point (28) inboard of the other (19) of the opposed sides of the respective tooth, whereby part (29) of the material (21) of the backing member (15) defines part of the medial portion (27) of each tooth, the surface (22) of the backing member (15) also joining with a surface (30) of the first material (16) in each land area (20), whereby the joining surfaces in each land area define an interface line (31) therebetween, the interface line in each land area having a portion (32) thereof disposed spaced from the tensile member (13) on the side (33) thereof opposite to the side (25) thereof that faces toward the teeth (14).
Abstract:
Un raccord pour fluides pour un tuyau, se caractérise par un assemblage de couplage rapide entre le premier et le deuxième organe du raccord. Le premier organe (12) de raccord est connecté au tuyau et est en général cylindrique, comportant une partie principale (15) et une partie (16) à diamètre réduit. Des cannelures périphériques (24, 25) sur la partie réduite (16) comportent des bagues (41, 42, 43) d'étanchéité qui forment un joint étanche avec le deuxième organe (13) de raccord qui s'adapte autour du premier organe, grâce au contact des bagues (41, 42, 43) d'étanchéité avec un alésage interne (29). Le joint principale (41) est constitué par un joint torique élastique placé dans la cannelure (24) à l'intersection d'une paroi (22) et de la partie (16) à diamètre réduit du premier organe (12) de raccord. Le joint torique contacte une saillie (36) formée sur une paroi (35) qui intersecte une partie de l'alésage (29) du deuxième organe (13) de raccord. L'on obtient ainsi aussi bien une compression axiale qu'une compression radiale entre les organes de raccord. La deuxième cannelure périphérique (25) est agencée à une certaine distance de la première cannelure (24) et comporte un autre joint torique (42), de même qu'une bague fluoroélastomère de soutien (43) qui contribue à renforcer le joint. Les deux organes de raccord (12, 13) sont interconnectés et verrouillés par une goupille (14) en forme de U dont les branches (44, 45) s'insèrent dans deux cannelures périphériques opposées (18, 38) sur la partie principale (15) du premier organe (12) de raccord et la base du deuxième organe (13).
Abstract:
Tendeur (22) pour une courroie de transmission de puissance (21) pouvant être actionnée dans un chemin sans fin, et son procédé de fabrication. Le tendeur (22) comprend une unité de support (36) permettant de le fixer par rapport à la courroie (21); une unité d'engagement de la courroie (38) est fixée sur l'unité de support (36) et est mobile par rapport à celle-ci; une unité à ressort mécanique (39) est associée à l'unité de support (36) et à l'unité d'engagement de la courroie (38) et agit sur l'unité d'engagement de la courroie (38) par rapport à l'unité de support (36) de manière à appuyer l'unité d'engagement contre la courroie (21) avec une force permettant de tendre la courroie (21); une unité d'amortissement fluide (40) associée de manière opérationnelle à l'unité de support (36) et à l'unité d'engagement de la courroie (38) pour amortir le mouvement de l'unité d'engagement de la courroie (38) par rapport à l'unité de support (36) dans au moins une direction de mouvement de celle-ci.