Abstract: A borehole isolation device. The borehole isolation device may include a body having an outer diameter and an expandable ring. The expandable ring may be configured to expand from a first outer diameter that is approximately equal to or smaller than the outer diameter of the body to a second outer diameter that is greater than the outer diameter of the body when a fluid is flowed past the expandable ring in the borehole.

Abstract: A reinforced seal for use in a rotating control device in a wellbore includes an annular elastomeric body and an internal support embedded within the elastomeric body and extending in an axial direction, the internal support comprising a plurality of overlapping petals. A system for sealing a drill string includes a rotating control device including the reinforced seal configured to accommodate the drill string therethrough.

Abstract: An all-elastomeric sealing element for a rotating control device includes a base portion, a conical portion and has a central pipe opening through both the base portion and the conical section. The conical section has an elastomeric core layer and an elastomeric surface sealing layer which encases the core layer. The surface sealing layer is softer than the core layer, as measured on a standard durometer scale.

Abstract: An all-elastomeric sealing element for a rotating control device includes a base portion, a conical portion and has a central pipe opening through both the base portion and the conical section. The conical section has an elastomeric core layer and an elastomeric surface sealing layer which encases the core layer. The surface sealing layer is softer than the core layer, as measured on a standard durometer scale.

Abstract: A plunger seal has a cylindrical protruding portion on its front face. A base end portion of the protruding portion has a recessed curved shape having a certain curvature. In a portion of a pump head, where the plunger seal is mounted, a seal insertion portion into which the protruding portion of the plunger seal is to be fitted is formed as a cylindrical recessed portion. An opening edge portion of the seal insertion portion has a protruding curved shape having the same curvature as the base end portion of the protruding portion of the plunger seal.

Abstract: The present invention is directed to a wobble piston and seal assembly for an oil free compressor. An upwardly directed curvature is provided on a piston surface which supports the seal. The curvature is located adjacent the perimeter of the surface to impart a slight dish shape to the surface. Preferably, the curvature has the same radius as the bend radius of the seal when the piston head is inserted into a cylinder. When the seal is initially clamped to the support surface, the seal is formed to take on the curvature of the support surface. Consequently, the seal is preformed into a shallow cup shape prior to final forming when the piston and seal assembly are inserted into a cylinder.

Abstract: An improved wobble piston and seal assembly for an oil free air compressor. The piston has a seal support surface which is provided with an upwardly directed curve adjacent its perimeter. A flat annular seal is secured to the piston to be supported by the support surface. The curve imparts a limited bend to the seal adjacent the perimeter of the piston. The piston and seal are then inserted into a cylinder which increases the bend to substantially 90°. The region of the bend in the seal adjacent the top of the piston is supported by the curved top to reduce flexing during operation at high air pressures. By preventing a reduction in the bend radius at high air pressures, stress in the seal at the bend is reduced, permitting use of a harder more durable seal material.

Abstract: An accumulator piston for an automatic transmission. The piston comprises two components, the first and second being cup elements welded together with their closed ends in abutting relation. The lower cup includes a curled back portion with a radial flange having an axially extending bi-directional oil seal thereon, and spaced apart recesses in the curled back portion to permit oil to flow therein. The upper cup includes a radial flange of reduced diameter compared to the lower cup flange. The flange also has a lip seal thereon. The piston is spring-loaded and moves up and down in a bore and counterbore in response to fluid flow on either side of the piston to absorb shifting shocks.

Abstract: A piston and seal assembly that has a rigid core with an elastomeric seal bonded thereto. The core has an annular outer cylindrical edge, a forwardly facing surface and a rearwardly facing surface. The elastomeric member is bonded to the core so as to encase the annular cylindrical edge. The elastomeric member extends outboard of the rearwardly facing surface of the core to provide a sealing lip. An annular concave surface merges with an annular convex surface located axially rearwardly of the rearward facing surface on the core. A radially outwardly directed surface on the lip portion merges tangentially with the convex surface.

Abstract: In a priming piston loading double acting pump for high viscosity materials, the shovel plate assembly is formed of a flexible, abrasion resistant disk or cup. The disk may be made from silicon rubber and the cup may be made from a glass filled Teflon polytetrafluoroethylene material. The clearance between the plate assembly and the intake cylinder is essentially zero to allow for a build-up of a vacuum as the plate assembly moves downwardly and out of the intake cylinder to greatly enhance the loading ability of the pump.

Abstract: The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular groove a space (23) which is acted upon by the pressure of the gas in the compression space. Starting from this circumferential face (12) the piston ring exhibits two radial boundary areas (13, 14) parallel with one another, of which the area (14) next to the compression space extends over part of the radial width of the ring. The piston ring (10) is guided by its two parallel boundary areas (13, 14) to slide against corresponding areas in the annular groove. The remaining area (16) of the piston ring next to the compression space, starting from the circumferential face (15) next the inner face (11) of the cylinder, forms a wedge face which extends at an angle of from 5.degree. to 15.degree.

Abstract: A lightweight mud pump piston assembly for reciprocating inside of a cylinder. The piston has decreased weight because light weight materials are used to form the majority of the hub which is the heaviest part of the piston. The piston maintains its compressive strength because the critical stress portions of the hub are made with high strength material having higher tensile strength and density than the light weight material.

Abstract: A rotary actuator device having an annular piston rod, the device comprising at least one piston held provided with sealing means and co-operating with an annular piston rod mounted so as to be capable of moving in an annular chamber, together with means for selectively applying a fluid under pressure in said annular chamber, wherein the piston head co-operates with the piston rod via a hinge having one degree of freedom in rotation and one degree of freedom in translation, said hinge comprising a piece in the form of a knife whose edge co-operates with a V-groove in a female portion of triangular profile, the knife edge and the V-groove being parallel to the axis of rotation of the piston rod. This disposition enables the forces exerted on the sealing means to be brought back into balance, thereby increasing sealing even under high pressures.

Abstract: A piston for a door closer comprises metal cups on opposite ends of a stem. A plastics ring is a snap-fit in one of the cups and protrudes from that cup to seal against the wall of a cylinder. A groove in the side wall of the cup for receiving a rib on the ring is formed by pressing a substantially flat blank before the blank is formed into the cup.

Abstract: An apparatus includes a tilt piston having a piston head. The piston head is reciprocally disposed within a cylindrical bore formed in a housing, the bore being oriented along an axis. A seal is mounted circumferentially about the piston head. The seal has an outer diameter that exceeds an inner diameter of the cylindrical bore. The seal extends radially in a first direction having an axial component. A support is mounted circumferentially of the piston head adjacent the seal. The support has an outer diameter less than the outer diameter of the seal. The seal is a continuous annular ring which may be of a circular or rectangular cross section. The seal and the support may be formed as a unitary member or may be two distinct elements. The support contacts the bore during a portion of travel of the piston within the bore.

Abstract: A hydraulic master cylinder piston carries a circumferential seal ring which allows recuperation flow valving. The floating seal has a reinforcing metal girdle which prevents radial expansion and axial crushing. The seal material resists extrusion and has an outer radius slightly greater than the radius of the circumferential girdle. A forward slotted bearing ring maintains the piston in alignment with the bore. During piston return, recuperation occurs through a path comprising the radial clearance between piston and floating seal ring and at least one slot or groove in the bearing ring. Upon full piston return, the seal is withdrawn from the master cylinder working chamber into a larger diameter bore communicating with the reservoir and thus allows relatively free make-up flow.

Abstract: An improved reinforcement cage assembly for use in the manufacture of a load lifting swab cup wherein the swab cup includes an elastomeric material bonded to the reinforcement cage assembly. The reinforcement cage assembly includes a metal base assembly and a plurality of axially disposed reinforcing wire members. In addition, an improved load lifting swab cup is disclosed having as an integral part thereof the improved reinforcement cage assembly.

Abstract: Improvements in the rotating head assembly of a rotating blowout preventor. The rotating head assembly includes a stripper rubber which has an upper annular area attached to the lower annular end of a metal support member. The support member extends upwardly into fixed relationship respective to part of the rotating head. The stripper rubber downwardly depends into concentrically arranged, spaced annular body members. The inner annular body has an axial passageway formed therethrough for telescopingly receiving a rotating member in sealed relationship therewith. The outer annular member has an outer circumferentially extending wall surface which rotatably engages the lower marginal end of a fixed washpipe. The inner and outer annular members are made integral respective to the upper annular area of the stripper rubber, and are separated from one another by a downwardly opening annular recess.

Abstract: A swab cup for oil wells is provided which comprises means by which the elastic side walls of the cups can be radially expanded almost throughout their entire length. The oil well swab cup has a substantially cylindrical uniform wall thickness resilient annular body having a multiplicity of parallel metallic longitudinal wires imbedded in its external periphery, the lower end of each wire terminating in a hook-like formation extending into relatively free articulation with a retainer wire ring imbedded in the lower end of the body.

Abstract: A packing is provided with a multilayered construction and a cup-like shape. The packing is configured to be carried in a packing holder for reciprocating motion within a pump cylinder. Some of the layers in the packing terminate on the convex face of the cup shape at radially spaced locations therearound. Thus, a peripheral portion of a number of the layers behind the cup lip are exposed to be engaged by the cylinder wall at a continuous contact area therearound. The hardness of the layer located outermost on the convex face is the greatest, and the hardness of each succeeding adjacent layer is lesser than the one immediately preceeding when progressing toward the cup lip along the convex face. Extrusion of the packing between the packing holder and the cylinder wall and subsequent severe localized wear is resisted by the greater hardness layers.

Abstract: A well swab cup has an annular bushing for supporting a plurality of longitudinally extending wire reinforcing members within an elastomeric cup-like body. The reinforcing members are supported by a base cup around the lower portion of the bushing and extending upward within the body. An internal elongated hollow reinforcing member extends upward from the base cup within the pattern of the wire reinforcing members and within the elastomeric, cup-like body.

Abstract: A well swab cup has an annular bushing for supporting a plurality of longitudinally extending reinforcing members within an elastomeric cup like body. The reinforcing members are supported around the periphery of the bushing and extend upward to a mid-portion of the body. A reinforcing member position support assembly is located above the bushing within the body to locate and position the reinforcing members in a spaced relation to each other around the swab cup.

Abstract: A well swab cup has an annular bushing for supporting a plurality of longitudinally extending wire reinforcing members within an elastomeric cup like body. The reinforcing members are supported in a base cup around the lower portion of the bushing and extend upward to a mid-portion of the body. Approximately one half of the reinforcing wire members extend the full length of the swab cup and the others terminate at a mid-point of the swab cup's length within its elastomeric body.

Abstract: A packing for a reciprocating pump comprises a resilient body of elastomeric material with a cup-like shape and includes a plurality of flat cantilevered spring members embedded within the annular wall of the body. The spring members provide support for the flexible wall and are essentially fixed in position at their ends disposed at the base of the cup-shaped body while being free to flex at their opposite ends adjacent the open end of the resilient body. A peripheral annular lip defines the open end of the cup-shaped body and has a profile in the axial direction which imposes a predetermined deflection curve on the spring members when the packing is surrounded and compressed by the cylindrical wall of a pump cylinder. A predetermined pressure profile results between the peripheral lip and the cylinder wall as the cantilevered spring members urge the peripheral lip to resume its uncompressed shape.

Abstract: An oilwell swab cup is formed by clamping a plurality of vertical wire members in a circular U-shaped cup and molding an elastomeric material around the wires and cup.

Abstract: An oilwell swab cup is formed by clamping a plurality of vertical wire members in a circular U-shaped cup and molding an elastomeric material around the wires and cup.

Abstract: An oil well swab cup with improved wear characteristics utilizes a single integral reinforcing structure featuring a wear surface forming a substantial portion of the external surface of the cup.