Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7861643 | Piston device The present invention discloses a piston device which is disposed in a cylinder. The cylinder has a chamber including a bore and an inner wall. The piston device comprises a piston body and at least an annular ring. The piston body has a top side and a bottom side, ... | 01/04/2011 |
| 7240606 | Crimped piston to rod joint A method for assembling a piston on a rod, and resultant piston and rod assembly, uses one or more lock rings that are mechanically deformed radially inwardly into respective locking grooves in the rod, thereby axially locking the lock ring to the rod. The lock ring... | 07/10/2007 |
| 7134379 | Gas cylinder Disclosed is a gas cylinder, for improving sealing characteristics of the gas cylinder and improving convenience in manufacturing, including: a valve having a gas opening/closing pin at a through hole in its center, for intermittently passing a gas, and additionally... | 11/14/2006 |
| 7111823 | Actuator An actuator having a set of slidable pistons including sliding regions with the sliding regions including at least one wear member supported by a resilient member and a second wear member laterally spaced from the first wear member with a lubrication reservoir locat... | 09/26/2006 |
| 7093361 | Method of assembling an actuator with an internal sensor A method of installing a piston position sensor proximate to a closed end of a hydraulic cylinder is provided. The sensor is attached to the face of a piston and that piston/sensor combination is inserted into the cylinder tube to position the sensor in the desired ... | 08/22/2006 |
| 7063004 | Piston assembly Apparatus and methods for assembling a piston assembly that comprises a piston comprising a head end flange and a crank end flange and a rod having a head end shoulder and a crank end shoulder. The head end shoulder of the rod contacts the head end flange of the pis... | 06/20/2006 |
| 6968772 | Slide-type cylinder coupling for CMP load cup A slide-type cylinder coupling which is suitable for the quick connect/disconnect attachment of a lift piston on a pedestal lift cylinder to a lift pedestal on a load cup or HCLU station of a chemical mechanical polishing apparatus. The cylinder coupling includes a ... | 11/29/2005 |
| 6817278 | Piston assembly for hydraulic cylinder A piston assembly for use in a hydraulic cylinder includes a piston head configured to slide axially within the hydraulic cylinder in response to changes in hydraulic pressure. The piston head has an axial through-hole. A piston rod has a proximal end axially abutti... | 11/16/2004 |
| 5975040 | Piston unit for an internal combustion engine Piston unit for an internal combustion engine, especially for a large diesel engine, comprising at least three main parts located in successive order in the direction of the longitudinal axis of the piston and to be connected to each other. The piston uni... | 11/02/1999 |
| 5941162 | Piston A piston having a body member made from plastic material adapted for mounting to a piston rod for axial movement with the piston rod in a hydraulic cylinder under high working pressure conditions is disclosed. The plastic piston body member has a first ax... | 08/24/1999 |
| 5913960 | Pistons A method is described of making a piston crown, the method comprises the steps of making a lower crown portion, the lower crown portion also having piston pin bosses, making an upper crown portion which co-operates with the lower crown portion and joining... | 06/22/1999 |
| 5878652 | Cast, substantially hollow, piston body In the embodiment shown, the body is formed of cast aluminum, and is devoid of clean-out holes in the upper and bottom ends thereof. Instead, the clean-out holes are formed in the outer, annular wall, through an annular recess formed in the outer wall, To... | 03/09/1999 |
| 5839353 | Piston for a hydraulic ram and the like and method for its assembly onto a piston rod A piston of a hydraulic ram, actuator or the like for fitting onto an end section of a straight rod with the assembly for fitting into to travel along a center cavity of a cylinder under the urgings of fluid under pressure that is introduced into that cyl... | 11/24/1998 |
| 5626072 | Piston assembly for use with a bicycle operated air pump An air pump for use with a chain-driven bicycle having a free wheel. The pump assembly comprises a pair of opposed cylinders and a double-ended piston rod mounted in a housing. The piston rod has a bearing slot, which engages a crank pin on a crankshaft d... | 05/06/1997 |
| 5347915 | Piston compressor for the oilfree compression of gases 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 ... | 09/20/1994 |
| 5253682 | Free piston gas delivery apparatus and method A gas delivery apparatus which includes a vehicle fitted with multiple compressed gas cylinders, each provided with a free piston, along with a separate liquid reservoir cylinder, for sequentially displacing the gas located on one side of the free piston ... | 10/19/1993 |
| 5199114 | Drain clearing device A drain clearing device having a transparent and hollow cylindrical body, a piston plunger assembly partially disposed in the cylindrical body, piston plunger assembly support attached to an upper end of the cylindrical body, and a drain seal attached to ... | 04/06/1993 |
| 5076150 | Piston assembly with wear resistant piston ring lands The Assembly comprises a piston body having a longitudinal axis to which are added, in interlayered fashion, separate, piston-ring lands and spacers. In one embodiment, a pair of rider rings are coupled to the piston body, in spaced apart locations, to gu... | 12/31/1991 |
| 5052275 | Horizontal reciprocating compressor with an eccentrically adjustable piston therein The horizontal reciprocating compressor is provided with a cylinder, piston and piston rod connected to the piston. An eccentric ring is mounted eccentrically within the piston and rotatably receives the piston rod. Rotation of the eccentric ring from tim... | 10/01/1991 |
| 5006047 | Compressor with a segmented piston rod assembly The invention relates to a compressor having a piston and rod assembly which is segmented to allow adjustment of the compressor's output. In particular, fasteners accessible from the top surface of the piston can be removed so that shims can be added or r... | 04/09/1991 |
| 4981070 | Multi-part piston for servomotor A servomotor is actuated by a pressure medium and has a piston reciprocated in the cylinder, the piston being mounted by a piston rod that extends through a cylinder end wall. The piston has a piston member bearing against the cylinder and is mounted for ... | 01/01/1991 |
| 4955284 | Piston having ceramic parts A piston has a first endwall, a second endwall and a tubular ceramic sidewall extending between and forming a closed cylinder with the endwalls. The piston does not include a piston ring. The first endwall is substantially flexible and is releasably inter... | 09/11/1990 |
| 4881455 | Piston for use in a gas pump A piston slidably inserted in the cylinder of a gas pump, said cylinder having a cylinder head and an outlet valve located near the cylinder head. The piston comprises a cylindrical piston body and a wear-reducing sheet wound one time around the piston bo... | 11/21/1989 |
| 4875405 | Sealing device A sealing device particularly suitable for sealing pistons of working cylinders and for sealing two machine components which can slide against one another is disclosed. A conventional sealing element consisting of low-friction, but not very elastic materi... | 10/24/1989 |
| 4831920 | Ballistically tolerant actuator Piston (25) and/or gland (20) structure for a hydraulic actuator (10) includes a plurality of deformable plate members (40, 45, 90 and 95) interconnected at a plurality of locations thereon by frangible fasteners (50). The fasteners are highly loaded in s... | 05/23/1989 |
| 4800801 | Pump A swash plate pump includes a housing and cylinders arranged in a circular pattern around the drive shaft. Piston rods are pivotally connected at one end to the swash plate and mechanism surrounding the drive shaft and axially slidable along it controls t... | 01/31/1989 |
| 4798270 | Hydraulically actuated sliding-caliper disc brake An actuator for a hydraulically actuated caliper disc brake having a brake shoe comprises an actuating piston of two-part construction mounted for displacement in a cylinder and acted upon by a pressure fluid. The actuator has a cup-shaped member of cast ... | 01/17/1989 |
| 4729291 | Gas compressor The Compressor is small, compact and lightweight in that it is formed of the barest essentials. It has a pair of in-line cylinders, with pistons reciprocatable therein, and the crankshaft, having only one crank, is drivingly coupled to one of the pistons.... | 03/08/1988 |
| 4714008 | Piston for internal combustion engines and the like An improved piston for operation within a cylinder. The piston includes a main piston body having a primary cylindrical surface, a first end, and a secondary surface of smaller diameter, the secondary surface of smaller diameter is disposed between the pr... | 12/22/1987 |
| 4630958 | Attaching coaxially a member or fitting with a bore therethrough to a shaft A connection between a first member (e.g. a piston rod) and a bore in a second member (e.g. a piston) which is formed by two spaced grooves on the first member at least one of which is in register with one of two spaced steps in the bore, and a compressio... | 12/23/1986 |
| 4478133 | Arrangement on members which oscillate or pivot A member oscillates on a face and another member pivots on a bed of the first member. Passages are provided through the members to lead a lubrication fluid under pressure into a fluid pocket between the mentioned face and one of the members. The fluid pre... | 10/23/1984 |
| 4381179 | Pumps with floating wrist pins Multi-cylinder in-line and radial pumps having an improved structure for coupling the piston heads to the crankshaft such that the number of parts commonly employed and the size of the resulting pump is greatly reduced when compared to prior art pumps now... | 04/26/1983 |
| 4317409 | Mud pump piston assembly A mud pump piston assembly is provided which facilitates replacement and secure holding of piston parts which wear rapidly. A hollow piston member which fits on the end of a piston rod to seal against the cylinder, is held in place by a thin pressure ring... | 03/02/1982 |
| 4261251 | Kelly head for hydraulic mast digger A hydraulic mast digger has a kelly head with improved retaining and sealing features. The digger is of the type having a kelly with a bearing assembly mounted between the kelly and a bearing sleeve. The bearing sleeve is reciprocally carried in the hydra... | 04/14/1981 |
| 4229149 | Oil well pump An oil well subsurface pump comprising a housing having one end thereof adapted to be secured to the lowermost end of a sucker rod, or the like, and the opposite end thereof in open communication with the fluid reservoir in a well bore, a ball check valve... | 10/21/1980 |
| 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 |
| 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 |
| 4048909 | Piston ring A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl wi... | 09/20/1977 |
| 4044655 | High pressure plunger and method of manufacture A high pressure plunger and a method of making for use in piston-cylinder like apparatus which are used for the high pressure compression of gases up to, for example, approximately 40,000 p.s.i. A high pressure plunger of the present invention comprises a... | 08/30/1977 |
| 4036113 | Pressure piston for a die-casting machine The pressure piston for a die-casting machine comprises a carrier formed with a crown having a central blind bore closed at its driving end and with an abutment ring. Surrounding the carrier and abutting the abutment ring is a piston skirt forming with th... | 07/19/1977 |
