Bizarre Patents
A forehead support apparatus for resting a standing users forehead against a wall above a bathroom commode or urinal or beneath a showerhead.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7384249 | Fluid metering system A fluid metering system includes a housing having a piston chamber with first and second spaced ends, at least one housing inlet passage, and at least one housing outlet passage. The housing inlet and housing passages communicate with the piston chamber. A piston is... | 06/10/2008 |
| 7380493 | Compressor A reciprocating compressor is provided that includes a compression chamber inside of a cylinder and a piston inserted therein. The piston includes a head, a skirt extended from a lower end of the head so as to be spaced away from an inside wall of the cylinder, and ... | 06/03/2008 |
| 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 |
| 7001670 | Wear protection layer for piston rings, containing wolfram carbide and chromium carbide The invention relates to a wear protection layer for piston rings in internal combustion engines consisting essentially of chromium carbides, wolfram carbide, chromium and nickel. The wear protection layer is formed from a mixture of powders in which the first powde... | 02/21/2006 |
| 6474220 | Cooling channel piston with especially low overall height The invention relates to a process for producing a cooling channel piston, in which the overall height is reduced in that the annular recess has a lower height than the height of the tool used for producing the cooling channel, and the production of the c... | 11/05/2002 |
| 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 |
| 5682808 | Piston with a diametric reduction of a skirt portion greater on the thrust side, than that on the counter-thrust side The piston of this invention is so profiled that the diametric reduction of the shoulder portion of the skirt is greater on the thrust side than on the counter-thrust side and that the difference in diametric reduction between the thrust side and the coun... | 11/04/1997 |
| 5448942 | Engine piston A piston is free to slide in an engine cylinder, this piston comprising a piston head of circular cross-section, a skirt formed such that it is continuous with the lower part of said piston head, a piston pin passing through the skirt, and a connecting ro... | 09/12/1995 |
| 5404792 | Piston for internal combustion engine A piston for an internal combustion engine comprises at least a pair of ribs arranged between an inner surface portion of a skirt and side portions of pin bosses. The ribs are symmetrical with respect to a thrust center line of the piston and have in a lo... | 04/11/1995 |
| 5299490 | Piston with flush connecting wall sections at pin boss surface The invention relates to a piston, particularly of light metal, for internal combustion engines, comprising a piston skirt substantially closed in the peripheral direction, pin bosses set back with respect to the piston skirt diameter in the direction of ... | 04/05/1994 |
| 5261321 | Piston having oval shaped crown A piston for connection by a piston pin and connecting rod to a crankshaft for reciprocating in a cylinder of an internal combustion engine. The piston has a crown and top land region, an intermediate region including at least one additional land, and a s... | 11/16/1993 |
| 5211101 | Piston with oval shaped lands A piston for an internal combustion engine with a separate head and skirt which are joined by the piston pin. At least one of the upper lands has a reduced diametrical clearance with the cylinder wall in an area perpendicular to the pin direction. The bot... | 05/18/1993 |
| 5172626 | Stabilized piston skirt having varying peaks and concave surfaces A piston with a skirt shaped to accommodate distortion by changing thermal and load conditions is further modified to increase stability and broaden load distribution to reduce contact forces and wear by providing maximum radii lines on either side of a l... | 12/22/1992 |
| 5158008 | Light plunger piston for internal combustion engines A piston having a head with ring grooves, a skirt having hub bores, and a pin, with the following dimensions: L/D=0.45-0.8 H/D=0.25-0.5 A/D=0.3-0.5 T/D=0.45-0.8 where L=maxium length of the piston D=maximum diameter of the piston H=compression height A=maximum skir... | 10/27/1992 |
| 5113817 | Piston with specific land characteristics A piston for an internal combustion engine with a separate head and skirt which are joined by a piston pin. The ring belt extends downward from head and terminates above the pin. The space between the lower edge of the ring belt and a section of the head ... | 05/19/1992 |
| 5107807 | Piston for internal combustion engine A piston for an internal combustion engine comprises a skirt portion formed with a piston pin hole. The skirt portion includes in an axial direction of the piston a first portion upper than an axis of the piston pin hole, and a second portion lower than t... | 04/28/1992 |
| 5081967 | Piston with separate head and skirt A piston for an internal combustion engine with a separate head and skirt which are joined by a piston pin. The ring belt extends downward from the head and terminates above the pin. The space between the lower edge of the ring belt and a section of the h... | 01/21/1992 |
| 5058489 | Piston structure for internal combustion engine A piston structure for an internal combustion engine is provided. This piston includes an oval slipper skirt with a cross sectional profile in the form of an ellipse defined by preselected major and minor axes. A difference between the major and minor axe... | 10/22/1991 |
| 5054375 | Piston for internal combustion engine A piston comprises a crown part, a piston under part, a first shoulder at a thrust side formed between the crown part and the piston under part, a second shoulder at an anti-thrust side formed between the crown part and the piston under part, a first in-l... | 10/08/1991 |
| 5048398 | Single, light-weight and low friction light-metal piston for internal-combustion engines The technical problem is to reduce the operating noise of such a piston. It is solved by means of a piston having the following dimensions: a) A=(0.45-0.65) D; b) H=(0.25-0.4) D; c) A=(0.3-0.4) D; d) A greater than or equal to B; e) T=(0.45-0.8) D; f) the... | 09/17/1991 |
| 5042364 | Piston structure for internal combustion engine A piston structure includes protection of the peripheral edge portion of a lubricant injection nozzle receptacle cut-out. The piston structure employs mechanisms for reinforcing the peripheral edge portion of the cut-out to an extent that can avoid concen... | 08/27/1991 |
| 5040454 | Piston assembly and piston member thereof having a predetermined compression height to diameter ratio Present day diesel engines having aluminum piston assemblies are limited to combustion chamber pressures of approximately 12,410 kPa (1,800 psi) whereas the desire is to increase such pressures up to the 15,170 kPa (2,200 psi) range. To reach such levels ... | 08/20/1991 |
| 4856417 | Trunk piston for use in an internal combustion engine A piston comprises a piston crown section, a piston skirt section connected to the piston crown section and having a pair of relatively flat, inclined portions at a pair of radially opposite locations thereof and a pair of piston pin boss sections dispose... | 08/15/1989 |
| 4831919 | Asymmetric oval piston with higher convexity thrust face Pistons are described having oval polar profiles or both oval polar profiles and axial profiles machined to asymmetric curvatures about the plane which includes both the piston axis and the minor axis over at least a part of the skirt length, the asymmetr... | 05/23/1989 |
| 4756241 | Piston for internal combustion engine A piston for an internal combustion engine in which the skirt portion of the piston is slightly oval rather than cylindrical and the size of the oval is varied along the skirt to produce contact surfaces of a particular shape engaging the cylinder. Specif... | 07/12/1988 |
| 4716817 | Piston, particularly for internal combustion engines A piston, particularly for internal combustion engines, of which the bearing surfaces with which the piston comes into contact with the engine cylinder bore lie on a generated surface which runs asymmetrically to the axis of an engine cylinder accommodati... | 01/05/1988 |
| 4691622 | Light alloy piston In a light alloy piston each of the load-carrying skirt surfaces is divided by a depression into two load-carrying partial shaft surfaces. In order to reduce the friction losses and the consumption of lubricant the depth of the depression (8, 9) between the ta... | 09/08/1987 |
| 4648309 | Light alloy piston In a light alloy piston having a convex and oval external shape, the piston skirt has in the cold state a larger running clearance at its top end than at its bottom end. In order to reduce the friction loss of such piston, the piston skirt has a larger ov... | 03/10/1987 |
| 4302992 | Piston turning machine A lathe type piston turning machine wherein a single point cutting tool is controlled simultaneously by two separate cams to generate a desired contour on a piston which varies in both radial and axial cross section.... | 12/01/1981 |
| 4196655 | Fluid motor A fluid motor and more particularly a fluid motor having an improved piston head structure.... | 04/08/1980 |
