Abstract: A piston for a pump includes a hub portion defining opposing outer surfaces and concave lateral portions between the opposing outer surfaces. The piston also includes inserts configured to provide a replaceable surface, the inserts being coupled to each of the opposing outer surfaces. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A piston for a pump a hub portion defining opposing outer portions, and inserts configured to provide an adjustable surface coupled to each of the opposing outer portions. The hub portion includes a first hub portion and a second hub portion configured to abut one another. Each of the inserts includes an outer shell and a base portion. The first hub portion includes a plurality of the opposing outer portions, and each of the base portions of the inserts is adjustably coupled to respective opposing outer portions of the first hub portion. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A piston for a pump includes a hub portion defining opposing outer surfaces and concave lateral portions between the opposing outer surfaces. The piston also includes inserts configured to provide a replaceable surface, the inserts being coupled to each of the opposing outer surfaces. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A piston for a pump a hub portion defining opposing outer portions, and inserts configured to provide an adjustable surface coupled to each of the opposing outer portions. The hub portion includes a first hub portion and a second hub portion configured to abut one another. Each of the inserts includes an outer shell and a base portion. The first hub portion includes a plurality of the opposing outer portions, and each of the base portions of the inserts is adjustably coupled to respective opposing outer portions of the first hub portion. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A folding automobile storage deck for semitrailers which allows a semitrailer so equipped to be used for either automobile or general freight transportation. The deck comprises both folding and swivel deck sections which are longitudinally divided, and which may be disposed either in a vertical storage position, the general freight carrying mode, or horizontally deployed and connected together when automobiles are to be carried. The swivel deck section is designed so that all points of attachment between the deck and the sidewalls, except the point at which the deck is swiveled may be disconnected and the ends of the deck support members thus disconnected telescoped into the deck section, thereby allowing the deck to be swiveled up or down as necessary during the process of automobile loading or unloading and reconnected when the process is completed.

Abstract: A semitrailer is described which is capable of conversion between a general freight carrying mode, and an automobile carrying mode. The floor of the semitrailer, which forms a lower tier, is fabricated in a discontinuous shape comprising from the rear end to the front end of the semitrailer an angled section, a drop section, and a horizontal section, the angled section extending downward at an angle whose vertex is located at the rear end of the semitrailer. An upper tier is formed by track supporting members mounted on each sidewall of the trailer which can be pivoted downward from a storage position adjacent to the sidewall, to a horizontal position where the components of the members are connected to form a continuous supporting structure.In the automobile carrying mode the track supporting members are deployed in their horizontal position, thereby permitting automobiles to be placed thereon in an upper storage tier.