Bizarre Patents
User-operated amusement apparatus for kicking the user's buttocks
An apparatus including a user-operated and controlled apparatus for self-infliction of repetitive blows to the user's buttocks by a plurality of elongated arms bearing flexible extensions that rotate under the user's control.
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| Number | Title | Issue Date |
| 7584693 | Bottomed cylindrical piston and method of manufacturing bottomed cylindrical piston By forging a metal material, there is formed a dustproof boot 20 in which a side of an opening end portion 20b formed with a groove 34 for a dustproof boot is provided with a diameter smaller than that of a side of a piston main body 2... | 09/08/2009 |
| 7506575 | Piston A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics. ... | 03/24/2009 |
| 7493850 | Piston A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics. ... | 02/24/2009 |
| 7370866 | Sleeve element having a biasable end region, apparatus including same, and method of use A sleeve element having at least one end region configured to be biased into a laterally adjacent recess formed in one of a piston element surface and a bore surface is disclosed. A seal assembly is disclosed including two sleeve elements, each sleeve element having... | 05/13/2008 |
| 7341037 | Engine piston and manufacture An engine piston is manufactured by assembling an outer shell, comprising a crown and tubular side wall in which a ring groove region and skirt are defined, with a plate-like mounting member and bonding them together by brazing or welding. The mounting member is loc... | 03/11/2008 |
| 7331276 | Piston for a two-cycle engine A piston for a two-cycle engine having a piston head and a piston wall in which are disposed wrist pin eyes. At least one undercut is formed between the underside of the piston head and the wrist pin eyes at a distance from the piston head. The undercut extends from... | 02/19/2008 |
| 7318397 | High efficiency high power internal combustion engine operating in a high compression conversion exchange cycle A piston (10), a spring (15) operatively coupled to a piston, the spring being inside (21) or outside (41) the piston, and if the spring is inside the piston, the diameter of the spring is equal to 0.7 to 0.9, and if it is outside of the ... | 01/15/2008 |
| 7302884 | Piston A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics. ... | 12/04/2007 |
| 7293497 | Piston A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics. ... | 11/13/2007 |
| 7273355 | Compressor assembly with piston having multiple cross sections A compressor assembly having a piston with multiple cross sections. The compressor assembly, in one form thereof, includes a cylinder block defining a cavity. A piston is at least partially disposed in the cavity and reciprocates along a central axis of the cavity. ... | 09/25/2007 |
| 7261066 | Piston for an internal combustion engine A pivoted piston for an internal combustion engine. The piston has a pivot pin and an arcuate first sealing surface (12) which describes a circumferential path about the pivot pin which forms a removable and replaceable skirt to the piston. The piston also in... | 08/28/2007 |
| 7255065 | Piston for an internal combustion engine A pivoted piston for an internal combustion engine. The piston has a pivot pin and an arcuate first sealing surface (12) which describes a circumferential path about the pivot pin which forms a removable and replaceable skirt to the piston. The piston also in... | 08/14/2007 |
| 7246552 | Piston having asymmetrical pin bore slot placement A piston, having a first side subject to major thrust loading and a second side subject to minor thrust loading, is provided. The piston has a crown portion and a first and second pin boss portion depending therefrom. An axially extending pin bore is provided within... | 07/24/2007 |
| 7207571 | Steel piston ring In a corner portion (2) defined between an outer peripheral surface (4) and a lower-side surface (3) of a steel piston ring (1), a groove (5, 6) having either an approximately quadrangular shape with a length of one side of 0.05 to... | 04/24/2007 |
| 7069897 | Forged piston for internal combustion engine and manufacturing method thereof A forged piston for an internal combustion engine formed from an aluminum alloy containing silicon in an amount of 6 to 25 mass %, includes an oil ring groove section (12) and a skirt section (13). The ratio (A/B) of the average size (A) of eutectic si... | 07/04/2006 |
| 7066078 | Piston for internal combustion engine By casting a preformed member composed of a fiber reinforced material into a base material of a piston, a pair of crown reinforcing portions corresponding to respective pin boss portions are formed on a crown portion, and the pair of crown reinforcing portions are c... | 06/27/2006 |
| 7024982 | Combination of piston and piston ring A combination of piston and piston ring includes a piston having a piston ring groove in which at least the groove portion of the piston is made of steel, a piston ring made of cast iron and fitted into the piston ring groove, and a hard coat film formed to at least... | 04/11/2006 |
| 7005620 | Piston and method of manufacture A piston particularly adapted for heavy-duty diesel engine applications is fabricated from separate parts having circumferentially extending joining surfaces that are heated prior to bonding to an elevated temperature sufficient to enable bonding of the joining surf... | 02/28/2006 |
| 7000526 | Hydraulic piston made from rolled sheet metal, method for its manufacture and intermediate product of the method The invention relates to a cup-shaped hydraulic piston (10) made from rolled sheet metal, which comprises an open end (12), a side wall (16) with a cylindrical outer surface (18) and an inner surface (22), as well as a piston head ... | 02/21/2006 |
| 6928921 | Piston bore A piston for a compressor for use in hermetically encapsulated small-type refrigerating machines, with a cylinder-jacket-like sealing and guide surface section (1a, 2) as well as at least two substantially bridge- and cylinder-jacket-sector-like... | 08/16/2005 |
| 6862977 | Piston A light weight piston for an internal combustion engine is disclosed that minimizes the stresses found in a transition area between the piston head and the associated piston pin bosses while maintaining a flexible soft connection between the piston skirts and the pi... | 03/08/2005 |
| 6860190 | Piston for internal combustion engine An engine piston has a crown portion generated about a longitudinal piston axis and, extending axially form the crown, a pair of gudgeon pin bosses defining a pin axis and spaced apart at opposite sides of an orthogonal thrust axis. A circumferentially discontinuous... | 03/01/2005 |
| 6637317 | Piston for a hydraulic pressure chamber The present invention relates to a piston for a hydraulic pressure chamber, especially a piston bore of a spot-type disc brake, wherein the piston is configured as a bowl-shaped hollow cylinder that is open on one side and made from a metal blank of a con... | 10/28/2003 |
| 6539836 | Piston for internal combustion engine An internal combustion engine for enhancing a heat radiation property of combustion gas, can sufficiently secure strength thereof relative to combustion gas, and a weight reduction thereof can be realized. A piston for an internal combustion engine is con... | 04/01/2003 |
| 6526871 | Monobloc piston for diesel engines A steel monobloc piston for diesel engines is formed with a relatively short piston skirt whose lower edge resides below the axis of the pin bores of the piston, but located at or above a lowest tangent point of the pin bores. The piston body preferably h... | 03/04/2003 |
| 6470792 | Combined compression and oil scraper piston ring A piston ring includes a first radial flank; a second radial flank; and an outer rounded circumferential surface constituting a contact face of the piston ring. The rounded face has a circumferential crest line situated at a distance from the first radial... | 10/29/2002 |
| 6347575 | Low emission piston and ring for internal combustion engine A piston and compression ring combination with a piston having a generally cylindrical configuration for mounting in a cylinder of an internal combustion engine, an annular groove adjacent the top of the piston; and a piston ring having an upper inwardly ... | 02/19/2002 |
| 6345569 | Piston for internal combustion engine An object of the present invention is to effectively achieve the reduction in piston slap sound in both of an expansion stroke and a compression stroke in consideration of a difference between the behaviors of a piston in the expansion stroke and the comp... | 02/12/2002 |
| 6318243 | Two-piece piston assembly An improved two-piece assembly having a piston skirt and piston crown made from two different materials. The piston assembly attaching to a piston rod without the use of an external bore in the piston skirt.... | 11/20/2001 |
| 6289791 | Arrangement in a combustion engine with internal combustion The piston is provided with a hollow space in which a head member for a piston rod is mounted. A disc is provided within the piston for seating of the head member via mating concave/convex surfaces and a separate support ring is disposed under a flange of... | 09/18/2001 |
| 6269734 | Piston for a hydraulic piston cylinder unit It is frequently important for the piston of a hydraulic piston-and-cylinder assembly, in particular the brake piston of a disc brake, which is slidably arranged within a cylinder bore to ensure a true-to-size mounting position of the piston inside the cy... | 08/07/2001 |
| 6152017 | Lightweight piston A piston (10) comprises a piston shaft (16) and an essentially cylindrical upper region (14). The piston shaft (16) essentially comprises two opposite shaft wall portions (16) relative to the pin axis. Two pin hubs (24) are also set back relative to the p... | 11/28/2000 |
| 6152016 | Piston with cast passages A piston is formed with one or more recesses or depressions on its underside as it is cast, molded or forged. The recesses are located adjacent the outer cylindrical wall of the piston head so that when a groove such as an oil ring groove is subsequently ... | 11/28/2000 |
| 6048126 | Mushroom-type pin retainer A mushroom-type pin retainer for a pin having a central bore and which connects a piston and a piston rod of an internal combustion engine. The pin retainer is comprised of a mushroom head connected to a shaft. The shaft has a section of larger diameter f... | 04/11/2000 |
| 6038943 | Piston pin, and method of making a piston pin A piston pin for connecting a piston to a connecting rod especially but not exclusively of an internal combustion engine is made from a sleeve formed by a non-cutting rolling procedure at formation of a longitudinal slot. The longitudinal slot of the slee... | 03/21/2000 |
| 5979391 | Cast light metal piston for a two-stroke engine A cast light metal piston of box-type construction for a two-stroke engine, comprising a piston blank having a gudgeon pin boss molded on a bottom section of the piston blank and a piston shaft having an open end and being connected to the gudgeon pin bos... | 11/09/1999 |
| 5762038 | Arrangement of piston and connecting rod for internal combustion engines A piston and connecting rod arrangement for internal combustion engines, including an upper piston part, a lower piston part and a connecting rod with a spherical connecting rod end. The spherical connecting rod end defines an upper spherical segment and ... | 06/09/1998 |
| 5743171 | Oil control ring and groove arrangement for improved blowby control Noncontacting surface areas are provided between the top wall of an oil control ring and the top surface of its groove to avoid entrapment of oil between adjacent surfaces of the two members during downward motion of a piston in a reciprocating, internal ... | 04/28/1998 |
| 5711206 | Piston and cylinder assembly for minimizing water blow-by in an air compressor This invention relates to a piston arrangement for minimizing water blow-by in a cylinder bore, comprising a set of metallic compression and oil rings, and a resin-filled O-ring for reducing water blow-by in the cylinder bore until the set of metallic com... | 01/27/1998 |
| 5701803 | Light-metal piston for internal combustion engines In order to improve the guidance of a light-metal piston for an internal combustion engine of a motor vehicle by obtaining a uniform behavior under different stresses of the pressure and/or counter pressure side of the piston skirt, the wall thickness of ... | 12/30/1997 |
