Recording distance measuring instrument attached to a vehicle hub

Claim 1

In a counting apparatus wherein the counting apparatus includes: a succession of independently rotatable coaxial, counting wheels each having a series of indicia thereon which, as the wheels rotate, are registered sequentially with a printing station; indexing means disposed between and meshing with each pair of wheels wherein the indexing means include means between preceding and succeeding wheels wherein each succeeding wheel advances one step for each revolution of the preceding wheel so that a higher number is registered with the printing station, and wherein the numbers of each succeeding wheel are more significant than the numbers of the preceding wheel, the improvement comprising: a frame having an opening with a portion which forms a first bearing surface; an axle for mounting the indexing means; means for mounting the axle on the frame and in contact with the first bearing surface to extend parallel to the axis of the counting wheels, the mounting means including: a rider attached to the frame having an aperture forming resilient partial bearing surfaces contacting the axle, said aperture adjacent a diverging section aligned with the opening in the frame, said rider releasably securing one end of the axle within the bearing surfaces so that when a force is applied to the counting wheels the counting wheels will impart a radial force to the indexing means causing the one end of the axle to disconnect from the bearing surfaces and relocate within the diverging section and the opening so that the indexing means is inoperative to further index the counting wheels.