Abstract: A reciprocating sanding and rubbing machine has a shoe portion to which the sanding or rubbing member is attached, this shoe portion being connected through a rack and pinion drive gear assembly to a symmetrically balanced piston assembly which is reciprocally driven by a pneumatic drive. The piston assembly is greater in length than half the total length of the tool, and moves in a carriage block reciprocally relative to the shoe. Two pistons and two associated pairs of compression chambers are employed, one of these pairs of chambers being used for drive in one direction, and the other pair being used for drive in an opposite direction. The pistons are supported on sleeve bearings which align them within the cylinder chamber, thereby minimizing wear on the pistons and the cylinder walls. Reciprocating motion of the piston is achieved by means of pneumatic valving arrangement employing a rotatable valving member which is driven by a rack and pinion gear assembly in response to motion of the shoe.

Abstract: A bottle which may be used to contain a liquid has a timer mounted therein to provide an indication of elapsed time. This timer is formed from a transparent tube sealed at the opposite ends thereof and having an object which is free to move in the liquid and which has a specific gravity different from that of such fluid. The tube has a member at one end therof which functions to retain the tube in the bottle and to provide a spout for pouring the fluid from the bottle. In the preferred embodiment, timing is provided as a function of the speed of movement of the object through the fluid when the tube and bottle are placed in a generally vertical orientation.