in which lubricating fluids are used like the rotational support for the wheels 184 the wheels 200 are secured to the pin 202 a self lubricating bearing 206 rotatably supports the pin 202 and the wheels 200 mounted thereon again the use of the self lubricating bearings 206 to rotatably support the wheels 200 and the pin 202 eliminates the need for lubrication each connector member 154 has an eye 208 at each end thereof each eye 208 receives a spherical bushing 178 of one of the compact carriages 152 in this manner the eyes 208 of the connection members 154 and the spherical bushings 178 of the compact carriages 152 facilitate the movement of the conveyor chain 150 along vertically and horizontally curved portions of the track 156 referring to fig1 there is shown a conveyor chain 250 comprising a third embodiment of the invention the conveyor chain 250 comprises a plurality of identical compact carriages 252 which are connected at equally spaced intervals along a wire rope 254 the conveyor chain 250 operates in a conveyor track 256 comprising a solid bottom wall 258 opposed solid side walls 260 and a top wall 262 having a center slot formed therein each of the compact carriages 252 comprises a unitary structure which may be manufactured from a variety of materials utilizing conventional manufacturing techniques for example the.