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| Number | Title | Issue Date |
| 4309937 | Composite master cylinder pistons Each of the pistons has a metallic, ceramic or high glass nylon plastic core insert with glass-filled nylon plastic molded around it to form the finished piston. The finished piston is ready to use as it comes from the mold. The core insert is designed to... | 01/12/1982 |
| 4257313 | Power steering piston and cylinder combination with plastic wear surfaces Plastic wear strips are provided on a power steering piston or cylinder to improve the efficiency of translation movement of the piston in the cylinder during operation. The plastic surface of the strip, which is preferably on the piston, minimizes wear b... | 03/24/1981 |
| 4246833 | High pressure spherical piston A spherical piston for high-pressure applications. By shifting the o-ring oove to the pressure side of the major diameter of a spherical piston such that one edge of the groove is the major diameter, a very close fitting spherical piston that will not hav... | 01/27/1981 |
| 4228725 | Rotary piston A piston for use with a rotary piston rod or so-called rotary piston can be constructed so as to utilize a solid sleeve-like piston body of a material selected from the group consisting of structural carbon and graphite. This piston body is utilized aroun... | 10/21/1980 |
| 4205595 | Piston A piston for use in pneumatic cylinders includes a tubular support with flange-like parts, a reinforcement ring received in the support and having a groove on its outside circumference, a guide ring rigidly mounted in the groove, and angular packing washe... | 06/03/1980 |
| 4203354 | Hydraulic piston with metallic O-ring groove and non-metallic slidable surfaces A fluid pressure actuated piston that consists of two parts, a metallic portion and a nonmetallic portion, is disposed in a conventional, metallic, cylindrical housing. The non-metallic portion is slidably engaged with the metallic housing. The metallic p... | 05/20/1980 |
| 4170926 | Fluted core disc brake piston A plastic disc brake piston is disclosed with a novel fluted inner core design, giving a piston with superior structural strength, crack resistance, and improved heat dissipation when used in disc brake assemblies.... | 10/16/1979 |
| 4069747 | Cylinder constructions An improved fluid cylinder including a housing defining a cylinder bore and having aligned piston rod openings at opposite ends thereof, which openings are nominally coaxial with the bore. A piston rod is within the bore and extends through both of the op... | 01/24/1978 |
| 4043255 | Cam follower piston A piston for a hydrostatic machine comprises a cam follower ball in a seating in a piston body. An aperture through the piston body provides access for working fluid to reach the seating to give lubrication and hydrostatic support. A low friction insert o... | 08/23/1977 |
| 4029000 | Injection pump for injecting molten metal The cylinder and piston of an injection pump which are severely corroded by molten aluminum or the like are made of a composite sintered body containing two or more of the compounds selected from the group consisting of boron carbide, titanium diboride, z... | 06/14/1977 |
| 3999468 | Piston for hydraulic translating unit A piston, such as that used in an axial and/or radial piston hydraulic translating unit, comprising a hollow-skirt portion having inner surfaces defining a substantially conical cavity filled with a core of lightweight material, the material being retaine... | 12/28/1976 |
| 3999894 | Compressor assembly A reciprocating piston assembly for a compressor is disclosed in that a piston with at least one groove formed in its outer surface is slidably mounted in a cylinder bore and at least one piston ring made of polymers of fluorine-containing olefin monomers... | 12/28/1976 |
| 3987705 | Device for opening and closing a mold in a molding machine A differential piston is reciprocable in a cylinder and subdivides the latter into a first and a second chamber. The piston has a piston rod which extends through the second chamber outside the cylinder and is adapted to open and close the mold of a moldi... | 10/26/1976 |
| 3986439 | Piston and slipper arrangement for hydraulic pump or motor A piston and slipper arrangement for a hydraulic pump or motor includes a tortuous fluid flow passage through the piston to a fluid pressure recess in the thrust face of the slipper at the opposite end of the piston. The fluid passage is formed by a plura... | 10/19/1976 |
| 3984904 | Internal retaining tabs for a filled piston The invention provides a hollow core filled piston including core retaining means for mechanically interlocking and retaining a core of filler material within the piston against angular and axial displacement. The piston includes a hollow skirt portion de... | 10/12/1976 |
| 3974745 | Piston for compressor A piston for a compressor having at both ends a step-down portion which defines an annular cavity when the piston is mounted in the cylinder, the said cavity being very thin while its length is dependent on the weight and the length of the piston. A rider... | 08/17/1976 |
| 3971298 | Piston assembly with compression and guiding rings A piston assembly adapted for use in nonlubricated high pressure compressors, comprising a piston having a plurality of peripheral grooves therein with a ring assembly in each groove constituted of one seal ring and one guide ring in a common groove. The ... | 07/27/1976 |
| 3956973 | Die casting machine with piston positioning control A die casting machine has a piston rod connected to its main ram for positioning the ram as the piston rod extends and retracts from a cylinder. A control system is provided which directly senses the position, velocity and acceleration of the piston rod. ... | 05/18/1976 |
