A chain drive for chain hoist with two link chains including two chain wheels arranged adjacent on a shaft and in torque-proof connection to one another, each chain wheel being used to guide a section of link chain having alternately horizontal and vertical links, namely, with pockets for accommodating horizontal links and with a groove extending in the circumferential direction for accommodating vertical links. The chain wheels have a fixed angular offset smaller than the angular pitch between two successive chain links of a chain wheel. This chain drive forms a chain drive system together with a sling for two link chains running parallel, wherein the sling includes, at one end, a connecting part for a load and, opposite thereto, two adjacently arranged connection portions for respective end links of either link chain, wherein the connection portions are offset from one another along the load direction with a linear offset smaller than the chain pitch along the load direction.

A sprocket is provided for a carrier link chain system which has a chain and a carrier link. The sprocket contains a unitary body which has three shaped sections including a central shaped section and two outer shaped sections sandwiching the central shaped section. The central shaped section has teeth for moving the chain of the carrier link chain. The two outer shaped sections have protrusions extending from a circumference and defines a path through which sides of the carrier link traverse and preventing a side-to-side movement of the carrier link and the chain links. The sprocket prevents jamming issues currently seen when a carrier link twists and causes the chain to jump off of the sprocket or the carrier link gets jammed against other portions of the conveyor system.

A bicycle sprocket comprises a sprocket body and a plurality of chain-driving teeth. The plurality of chain-driving teeth comprises a first tooth and a second tooth. The first tooth has a first maximum chain-engaging width defined in an axial direction parallel to the rotational center axis. The second tooth has a second maximum chain-engaging width defined in the axial direction. The first tooth has a first width defined in the axial direction. The first width is defined at a reference position radially outward spaced apart from a center point of a reference line by 1.5 mm. The reference line is defined to connect centers of neighboring pins of the bicycle chain engaged with the plurality of chain-driving teeth when viewed from the axial direction. The first width is 70% or more of the first maximum chain-engaging width.

A polygon compensation coupling system (30; 40; 60) comprises a first rotatable element (31; 41; 61), a second rotatable element (32; 42; 62a, 62b), and at least one linkage coupling the first rotatable element (31; 41; 61) with the second rotatable element (32; 42; 62a, 62b). The linkage comprises at least one first coupling element (34a; 44a; 64a) pivotably coupled to the first rotatable element (31; 41; 61) and at least one second coupling element (34b; 44b; 64b) pivotably coupled to the second rotatable element (32; 42; 62b). The first and second coupling elements (34a, 34b; 44a, 44b; 64a, 64b) are pivotably coupled to each other at a hinge point, the hinge point is configured to move along a compensation curve varying the coupling between the first rotatable element (34a; 44a; 64a) and the second rotatable element (32; 42; 62b).

A multiple bicycle sprocket assembly is basically provided with a first sprocket supporting member and a second sprocket supporting member. A first sprocket is coupled to one of a first bicycle inbound facing side and a first bicycle outbound facing side of the first sprocket supporting member, and is a separate member therefrom. A second sprocket is coupled to one of a second bicycle inbound facing side and a second bicycle outbound facing side of the second sprocket supporting member, and is a separate member therefrom. At least one fastening member connects the first sprocket supporting member and the second sprocket supporting member, and is a separate member therefrom. At least one hub engaged sprocket is free from connection with the at least one fastening member, and is a separate member from the first and second sprocket supporting members.

A bicycle sprocket comprises a sprocket element, a first shifting facilitation projection, and a second shifting facilitation projection. The sprocket element includes a rotational center axis, a sprocket body, and a plurality of sprocket teeth. The sprocket body includes a radially outer periphery disposed about the rotational center axis. The plurality of sprocket teeth are arranged on the radially outer periphery. The first shifting facilitation projection is coupled to the sprocket element to engage with an inner link plate of a bicycle chain when the bicycle chain is shifted from a smaller sprocket to the bicycle sprocket. The second shifting facilitation projection is coupled to the sprocket element to engage with an outer link plate of the bicycle chain when the bicycle chain is shifted from the smaller sprocket to the bicycle sprocket.

A sprocket assembly which is either driven by a drive chain or which drives the drive chain includes a hub centered about a sprocket axis and defining a hub radially outer surface; a plurality of sprocket teeth extending radially outward from the hub; and a cushion ring assembly adjacent to the plurality of sprocket teeth and circumferentially surrounding the hub radially outer surface. The cushion ring assembly includes a cushion ring adjacent to the plurality of sprocket teeth and circumferentially surrounding the hub radially outer surface; the cushion ring being resilient and compliant. The cushion ring assembly also each includes a retention ring which is partially embedded within the cushion ring and which engages the hub radially outer surface in an interference fit, the retention ring providing axial and radial retention of the cushion ring to the hub.

A bicycle sprocket includes a sprocket body, and a plurality of sprocket teeth. At least one of the sprocket teeth includes a first layered member, a second layered member and a third layered member. The first layered member has a first axial surface and a second axial surface. The second layered member is attached to the first axial surface such that the first and second layered members overlap each other in an axial direction as viewed parallel to a rotational axis of the sprocket body. The third layered member is attached to the second axial surface such that the first and third layered members overlap each other in the axial direction as viewed parallel to the rotational axis of the sprocket body. The first layered member has a specific gravity that is less than those of the second layered member and the third layered member.

Disclosed are bicycle chain rings for bicycles having specially shaped ramps with lifting surfaces for improved up-shifting performance. Additional embodiments of the bicycle chain rings of the present invention may be configured with one or more additional features formed within the chain rings including a transition slide, a tapered ramp face, a ramp bridge, a ramp lead, a trailing transition slide and a wear pin.

A sprocket assembly is provided. The assembly includes a sprocket frame having a central body and a first ledge portion body. The first ledge portion has a first aperture extending therethrough. The assembly further includes a first removable tooth having a first tip portion, first and second landing portions, and a first extension portion. The first tip portion has first and second sides and first and second ends. The first extension portion extends from the second end and has an aperture extending therethrough. The assembly further includes a first bolt extending through the first aperture in the first ledge portion and the aperture in the first extension portion to removably couple the first extension portion to the first ledge portion.