Abstract: A pump for fluent materials, and especially suitable for heavy and abrasive materials, has a piston in substantial clearance relation within a cylinder and operable in a pumping stroke to drive into a combination valving, wiping and sealing elastomeric ring about the discharge portion from the cylinder, so that the pumped material has minimal drag and wearing contact with relatively moving parts in the pump. The pump is adaptable for double action and proportional pumping.A self-reversing piston-driving fluid actuated motor is provided.

Abstract: It is common practice in factories to provide a multiplicity of electrically operated belt or chain driven mechanisms, each controlled by one of a multiplicity of switches located in a common panel. When a mechanism is out of order and requires servicing, it is usual to throw its control switch to an open-circuited condition for the protection of a repairman. All too frequently, someone closes the wrong switch, thereby setting the idled machine into unintended motion so that a serious injury to the repairman results. In accordance with the present invention a massive wedging means is provided for application to a chain or belt in such manner that essentially all motion is positively prevented.

Abstract: An electric steam-spray iron having a pump and a bi-stable valve in a single housing for drawing water from a reservoir and delivering it to either a spray nozzle or a steam generating chamber which communicates with steam ports in the sole plate. The valve's stable state is changed by rocking movement of the pump's piston.