Patent ID: 8162053

Claim:
An elongated plunger assembly for pressurized, conduit-enclosed travel utilized in recovery of hydrocarbon deposits in a ground penetrating oil or gas well, comprising: an elongated mandrel; a plurality of replaceable, radially movable curvilinear wear pads circumferentially disposed adjacent each end of the elongated mandrel; a wear pad edge-retaining housing extending on each end of the elongated mandrel to enclosably retain the longitudinally distal end of the replaceable wear pads onto the mandrel of the plunger assembly; a centrally disposed pad securement ring arrangement to simultaneously secure and permit release of an inner longitudinal edge of at least one wear pad from the plurality thereof, thus to permit simple removal and replacement of any particular conduit-worn wear pad from the mandrel of the plunger, wherein the curvilinear wear pads are biased radially outwardly by a plurality of spring members extending radially outwardly from the body of the elongated mandrel, wherein the centrally disposed pad securement ring arrangement is secured to a central ring-ridge by a releasably controlled bolt member therethrough, wherein a single bolt member secures a semi-circular securement ring to the central ring-ridge, and wherein the semi-circular securement ring has a biasable lock washer receiving opening for receipt of a releasable lock washer member therein.