A number of dolly assemblies are connected in series with chain linkage sections to form an endless conveyor chain for the dolly assemblies to move objects along a track. Each dolly assembly includes a link attachment and a wheel assembly supported by the link attachment. The link attachment includes a base and a body portion. The body portion presents an open-loop partially surrounding an interior and extending between a pair of ends. The ends are spaced from one another to define an opening to the interior therebetween. The pair of ends are also formed in toward the interior to partially surround a respective pocket. Each pocket is configured to receive a portion of an endlink of a respective chain linkage section therein, and each one of the formed ends functions to prevent the endlink of the respective chain linkage section from becoming unhooked from the body portion.

A link for a conveyor chain includes a first portion and a second portion laterally spaced apart from the first portion. The first portion includes a first sprocket-engaging pin, and the second portion includes a second sprocket-engaging pin. The first sprocket-engaging pin and the second sprocket-engaging pin protrude laterally away from one another. The first sprocket-engaging pin and the second sprocket-engaging pin may each have an oblong cross-section. At least one retainer can secure a connecting pin against movement relative to at least one of the first portion and the second portion, and each retainer can be positioned substantially within one of the first portion and the second portion.

A chain link is provided with a bushing construction where a chain pin is used for connecting a plurality of chain links, where the chain pin is inserted through the bushing along an axis, where the bushing in a cross section orthogonal to the axis has a circular cross section and where a resilient sleeve is arranged around the chain pin, where the chain pin has a flat face along the axis, and the resilient sleeve has a corresponding flat face in engagement with the flat face of the pin, and where the outer periphery of the resilient sleeve, when mounted on the chain pin, has a non-circular cross section, such that a free space is provided between the outer periphery of the sleeve and the inside of the bushing.

A conveyor chain includes a first flight including a first side portion having a first aperture, a first flight bar, and a first sprocket-engaging portion. The conveyor chain also includes a second flight including a second side portion having a second aperture, a second flight bar, and a second sprocket-engaging portion. The conveyor chain further includes a connecting pin having a first end portion received within the first aperture and a second end portion received within the second aperture. The connecting pin couples the first and second flights together. The first sprocket-engaging portion is positioned laterally outwardly of the first end portion of the connecting pin and the second sprocket-engaging portion is positioned laterally outwardly of the second end portion of the connecting pin.

A conveyor chain includes a first flight including a first side portion having a first aperture, a first flight bar, and a first sprocket-engaging portion. The conveyor chain also includes a second flight including a second side portion having a second aperture, a second flight bar, and a second sprocket-engaging portion. The conveyor chain further includes a connecting pin having a first end portion received within the first aperture and a second end portion received within the second aperture. The connecting pin couples the first and second flights together. The first sprocket-engaging portion is positioned laterally outwardly of the first end portion of the connecting pin and the second sprocket-engaging portion is positioned laterally outwardly of the second end portion of the connecting pin.

A number of dolly assemblies are connected in series with chain linkage sections to form an endless conveyor chain for the dolly assemblies to move objects along a track. Each dolly assembly includes a link attachment and a wheel assembly supported by the link attachment. The link attachment includes a base and a body portion. The body portion presents an open-loop partially surrounding an interior and extending between a pair of ends. The ends are spaced from one another to define an opening to the interior therebetween. The pair of ends are also formed in toward the interior to partially surround a respective pocket. Each pocket is configured to receive a portion of an endlink of a respective chain linkage section therein, and each one of the formed ends functions to prevent the endlink of the respective chain linkage section from becoming unhooked from the body portion.

In some aspects, a conveyor chain includes a first link, a second link, and a coupler link coupled between the first link and the second link. The first link includes a first portion and a second portion, the second portion oriented parallel to and laterally spaced apart from the first portion. The first portion includes a first sprocket-engaging pin protruding laterally, and the second portion includes a second sprocket-engaging pin protruding laterally. The second link includes a first portion and a second portion. The first portion includes a first sprocket-engaging portion protruding laterally, and the second portion includes a second sprocket-engaging portion protruding laterally. A flight bar is positioned adjacent an end of the first sprocket-engaging portion of the first link.

A conveyor chain includes a first link, a second link, and a coupler link. The first link includes a first sprocket-engaging portion and a second sprocket-engaging portion, each protruding laterally away from one another. The second link includes a first sprocket-engaging portion and a second sprocket-engaging portion, each protruding laterally away from one another. The coupler link couples the first link to the second link, and the coupler link is positioned laterally between the first sprocket-engaging portion and the second sprocket-engaging portion of each link. The coupler link includes a first joint pivotably coupled to the first link and a second joint pivotably coupled to the second link. The first joint permits pivoting movement of the first link about a plurality of axes, and the second joint permits pivoting movement of the second link about a plurality of axes.

The present invention relates to a belt with a protrusion, including: a belt main body including tooth portions at a predetermined tooth pitch on an inner surface of the belt in a longitudinal direction, and a cord extending in the longitudinal direction and arranged at a predetermined cord pitch in a width direction; and a protruding portion formed on a back surface of the belt main body by an integral formation, in which: the cord has a fineness of 900 to 1100 deniers, and a ratio of a total of intervals between the adjacent cords to a belt width of 12 to 45%; and the protruding portion is arranged outside the tooth portions, has a hardness of 81 to 91 degrees, and has a base width smaller than the tooth pitch.

A link for a conveyor chain includes a first portion and a second portion laterally spaced apart from the first portion. The first portion includes a first sprocket-engaging pin, and the second portion includes a second sprocket-engaging pin. The first sprocket-engaging pin and the second sprocket-engaging pin protrude laterally away from one another. The first sprocket-engaging pin and the second sprocket-engaging pin may each have an oblong cross-section. At least one retainer can secure a connecting pin against movement relative to at least one of the first portion and the second portion, and each retainer can be positioned substantially within one of the first portion and the second portion.