A roller assembly for car wash conveyors having three pairs of pusher rollers on the upper end of a conveyor roller bar in order to reduce and make more uniform the roller wear. The roller pairs are arranged to respectively engage the upper, intermediate and lower tracks of the conveyor. The pairs of pusher rollers are each mounted on one of three parallel shafts arranged in a triangular pattern each roller in each pair confined between sets of two plates having holes receiving the shafts which are welded thereto. Two of the shafts are welded to the upper end of the roller bar.

A three-axle, "six-wheel" pusher unit for a carwash system of the type wherein an endless chain moves under a slotted track. The pusher employs a straight bar which can project out of the track, with the track-contacting rollers positioned at the end of the bar and the wire-engaging rollers positioned at an intermediate position. The tire-contacting rollers are formed without internal inletting or open volumes and held in place by button-headed bolts and washers. The under-track forward rollers are secured to a removable axle which is held in a sleeve welded to the end of the bar. This axle is secured by means of a machine screw through the axle and sleeve and nut outside the sleeve. The head of the machine screw is smaller than the hole in the sleeve into which it fits, so as to bear against the axle and hold it tight against the opposite inner surface of the sleeve. In a second embodiment, a hollow rectilinear and tubular bar is employed with the third axle received through side holes and similarly secured.

A power and free conveyor having a slow down section through which conveyed articles travel at reduced speed. The slow down section comprises an endless auxiliary chain traveling at a speed less than the speed of the main drive chains with stops at selected locations along the auxiliary chain. The stops are pivotally mounted and gravity controlled to assume active positions upon entry into the path of travel of the articles so as to interact with an oncoming article to slow the article to the speed of the auxiliary chain. The pivotal motion of the stops with respect to the auxiliary chain is controlled so that the stops are pivoted to an inactive position and carried by the auxiliary chain during return of the chain.

In an automobile conveyor having an endless conveyor chain within a framework having top plates to support the tire of an automobile, and a plurality of roller dollies spaced along the length of the chain normally positioned for movement within the framework, the improvement which comprises a split collar clamp having first and second sections that are clamped around the driven shaft of the conveyor. The first section of each clamp is angled with respect to the vertical so that the shaft is cradled against the pulling force of the drive sprocket. The second section of the clamp is removably attached to the first section so that the clamp is accessible from the top plate of the conveyor for easy access and removal of the driven sprocket, bearing members and transverse sprocket shaft through the top plate.

An automobile conveyor having an endless conveyor chain within a framework having top plates to support the tire of an automobile and a plurality of roller dollies spaced along the length of the chain normally positioned for movement within the framework. Each of the roller dollies includes at least one upright mounting plate connected to the conveyor chain. The plate supports three equally spaced rollers which substantially form an equilateral triangle with one roller forming the vertex of the triangle and the other two rollers being coplanar forming the base of the triangle. The one roller is adapted to operatively engage to automobile tire with the other two rollers adapted for supported movement upon the top plates.