Having Varying Area Of Chamber Passageway For Thrust Member Patents (Class 188/288)
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Patent number: 4901828Abstract: A shock absorber for damping the movement of the body of an automobile is provided. The shock absorber comprises a pressure cylinder forming a working chamber operable to store damping fluid. The shock absorber further comprises a reciprocating piston disposed in the working chamber operable to divide the working chamber into first and second portions. An axially extending piston rod is disposed within the working chamber and is connected to the piston. Finally, the shock absorber includes an annular collar and a split ring for controlling the displacement of the piston.Type: GrantFiled: May 31, 1989Date of Patent: February 20, 1990Assignee: Monroe Auto Equipment CompanyInventors: Robert J. Schmidt, Jerome J. Zawada, Jr.
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Patent number: 4846317Abstract: An apparatus for damping relative movement of parts. The apparatus includes a cylinder defining a fluid chamber. A piston is located in the fluid chamber and divides the fluid chamber into first and second fluid chamber portions. The piston is connected to one of the parts and the cylinder is connected to the other of the parts. The piston and cylinder move relatively in compression and expansion strokes to damp relative movement of the parts. A fluid reservoir is in fluid communication with the first fluid chamber portion. A first valve controls fluid flow from the first fluid chamber portion into the fluid reservoir upon movement of the piston and cylinder during a compression stroke. A damping control provides a variable damping force resisting movement of the piston and cylinder during an expansion stroke. The damping control includes a second valve movable with the piston for controlling the fluid flow from the second fluid chamber portion to the first fluid chamber portion.Type: GrantFiled: August 25, 1987Date of Patent: July 11, 1989Assignee: TRW Inc.Inventor: Bernard C. Hudgens
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Patent number: 4821851Abstract: Suspension damper with double drum variable valving within the confines of the piston which strokes within the damper that is rotatable to predetermined stations in one revolution to provide a wide range of jounce and rebound damping characteristics and rotatable in an opposite direction from any station for maximized valve restriction producing optimized vehicle lift and dive control.Type: GrantFiled: August 21, 1987Date of Patent: April 18, 1989Assignee: General Motors CorporationInventors: William C. Kruckemeier, Gustavus P. Bock, Wayne V. Fannin
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Patent number: 4819770Abstract: A hydraulic device is provided for controlling the rate of relative movement of first and second members between predetermined first and second stations. The device includes a housing connected to the first member and provided with a first cavity for hydraulic fluid and a second cavity for hydraulic fluid segregated from the first cavity. The first cavity has adjacent first and second segments with the second segment having a greater cross-sectional area. An orifice is disposed adjacent an end portion of the first cavity first segment which is remote from the second segment and interconnects the cavities. A valve is remote from the orifice and permits restricted hydraulic fluid flow from the first cavity to the second cavity and substantially unrestricted hydraulic flow from the second cavity to the first cavity. The direction of flow through the valve depends upon the direction of movement of a piston mounted for reciprocatory movement within the first cavity.Type: GrantFiled: October 13, 1987Date of Patent: April 11, 1989Assignee: Rite-Hite CorporationInventor: Norbert Hahn
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Patent number: 4797971Abstract: A control mechanism for a door of a motor vehicle is described that is actuated via an inside and outside handle and comprises a piston-cylinder unit arranged between a door post and the vehicle door. It has a piston provided with passage openings for a pressure medium, the piston interacting with an interior valve that separates two working chambers of the cylinder from one another. The control mechanism is equipped with a blocking valve controlling the medium flow, this blocking valve being arranged in a control circuit connecting the two working chambers of the cylinder, acting against the flow direction. This blocking valve, via a control element at a door handle, can be controlled in such a way that the door is blocked in at least one intermediate position. The cylinder has at least one overflow duct between the two working chambers, the flow-through of which is controlled by the piston of the unit. The duct extends over an area into which the piston dips, up to a door opening angle of about 30.degree.Type: GrantFiled: January 27, 1987Date of Patent: January 17, 1989Assignee: Dr. Ing. h.c.F. Porsche AktiengesellschaftInventors: Georg Eger, Rainer Srock
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Patent number: 4762208Abstract: A vibration damper is provided for a towed body usable more particularly as head section of an underwater antenna towed by a boat and containing detection and measuring instruments.The damper of the invention comprises at least one piece with high loss angle in contact with a traction element so that vibrations perceived by the traction element cause deformations of said piece.Type: GrantFiled: June 25, 1986Date of Patent: August 9, 1988Assignee: Thomson-CSFInventors: Rene Reynier, Jean G. Malcor, Gilles Moresco, Francois Ramoger
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Patent number: 4566677Abstract: The device comprises two rigid elements 1a, 1b, 2 and an elastomer mass 10 interposed therebetween so as to be deformed when the elements move relative to each other in a longitudinal direction. The device includes a closed space with a restriction element 16 defining two chambers 23, 24 whose volumes vary inversely upon movement of the chamber walls, the two chambers being interconnected by one or more passages, the empty space being filled with a viscous fluid material so as to produce a damping effect in the passages. Application to helicopter blade frequency adapters.Type: GrantFiled: June 8, 1983Date of Patent: January 28, 1986Assignee: VibrachocInventor: Gildas Le Pierres
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Patent number: 4457498Abstract: A new breed of die cylinders operating at 1000-5000 psig. working fluid pressures and adaptable for use individually or by manifolding with punch presses to cushion dies can be operated with maximum rated pressure force against a force which a ram develops in one direction and in the opposite direction with partial pressure force which the die cylinders exert when force balanced. The following is accomplished by loading a piston underside by the same working fluid pressure when the piston bottoms inside a cylinder housing at the end of the ram induced stroke enabling an instant high pressure surge of fluid, be it Nitrogen gas or other working fluid, to enter the piston underside provided with a piston rod and exert a resistance force proportional to the net free area exposed thereto thereby providing force balanced cylinder operation.Type: GrantFiled: April 27, 1982Date of Patent: July 3, 1984Inventor: Richard S. Pauliukonis
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Patent number: 4405119Abstract: An oleopneumatic suspension with variable throttle orifices, particularly for aircraft landing gear comprising a rod (1) enclosing a pneumatic spring (2) and being fixed with respect to a piston (4) sliding in a cylinder (3), two valves (6) and (7) with permanent throttle orifices, the valve (6), which is of greater cross-section, throttling in the compression phase and the valve (7), which is of lesser cross-section, throttling in the extension phase, the suspension comprising in addition a throttle device, the section of whose orifice varies in dependence on the position and the direction of displacement of the piston (4) in the cylinder (3) so that over a given distance around a predetermined equilibrium position the orifices ensuring throttling in the compression and extension phases are of cross-sections respectively greater than the corresponding orifices over the remainder of the distance covered by the piston (4) in the cylinder (3).Type: GrantFiled: July 22, 1981Date of Patent: September 20, 1983Assignee: Messier-Hispano-BugattiInventors: Jean Masclet, Andre Turiot
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Patent number: 4399764Abstract: Passive apparatus for absorbing the kinetic energy of a collision to prot an underwater structure from damage in a collision which includes a ring suspended by a ring support system so that the ring is positioned between the structure and the expected path of potentially impacting objects. The ring support system includes eight rigid rods which have one end coupled to one of four symmetrically disposed supporting pylons by spherical sleeve bushings and their other end coupled by spherical rod ends to one of four standoff members that are fixed to the top surface of the ring at equal intervals around its circumference. A shock absorber is coupled between each supporting pylon and the ring midway between standoff members by spherical rod ends. The dimensions of the rigid rods and their attachment points to the supporting pylon and the ring are chosen so that the ring may pivot on the rods against the resistance of the shock absorbers in response to an impact, but cannot strike the enclosed object.Type: GrantFiled: July 6, 1981Date of Patent: August 23, 1983Assignee: The United States of America as represented by the Secretary of the NavyInventor: D. Darrell Menz
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Patent number: 4312499Abstract: A shock absorber assembly including a cylinder having a piston and piston rod mechanism movable relative thereto is formed with a hydraulic-mechanical damping system interposed in an annular space defined between the piston rod and the cylinder. The damping characteristics of the system are varied in accordance with the relative movement of the piston rod out of the cylinder by a damping mechanism which includes a spring, an annular member and a damping component operating to vary the cross-sectional area of the damping passage defined therethrough.Type: GrantFiled: January 24, 1980Date of Patent: January 26, 1982Assignee: Fichtel & Sachs AGInventors: Felix Wossner, Hermann Itzinger, Gunther Handke, Wilhelm Koch
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Patent number: 4307875Abstract: A gas spring in which a valve permits flow of a pressurized fluid between two compartments of a cylinder cavity separated by a piston for movement of a piston rod attached to the piston outward of the cavity while inward movement of the piston rod is normally blocked by a mechanism which responds to a predetermined, axial, inward force applied to the piston rod for releasing the same.Type: GrantFiled: July 24, 1979Date of Patent: December 29, 1981Assignee: Stabilus GmbHInventors: Klaus Schnitzius, Herbert Freitag
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Patent number: 4230309Abstract: A gas spring includes a cylinder having two axial portions of different cross section and two pistons mounted on a common piston rod and respectively matching the cross sections of the cylinder portions. The pistons are spaced on the piston rod so that they are either both in the wider cylinder portion or respectively received in the two portions. A first throttling passage permits flow of fluid between the two cylinder compartments separated by the larger piston, and a second throttling passage by-passes the smaller piston only during movement inward of the smaller cylinder portion to permit flow of fluid out of that cylinder portion. A valve arrangement is biased for sealing the two parts of the cylinder cavity separated by the smaller piston when the latter is in the smaller cylinder portion, but does not move inward of that portion. The valve arrangement responds to a sufficient, axially applied force for connecting the two cavity parts.Type: GrantFiled: December 7, 1977Date of Patent: October 28, 1980Assignee: Stabilus GmbHInventor: Klaus Schnitzius
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Patent number: 4131266Abstract: A shock absorber having a housing with a piston chamber and a radially spaced accumulator chamber. A piston rod having a piston at its inner end is slideably mounted in the piston chamber, while the outer end of the piston rod extends outwardly from the shock absorber housing wherein it is provided with a striker plate which is initially positioned for engagement by a load to be decelerated. The fluid passage between the accumulator and the piston chambers is provided with a tapered metering slot designed to communicate a lesser amount of oil between the piston and the accumulator chambers as the piston is decelerated, resulting in a gradual deceleration of the load exerted on the piston. An adjustable metering valve carried by the shock absorber housing is utilized to communicate oil from the piston chamber when a load is exerted on the striker plate which is less than the maximum amount the shock absorber may receive.Type: GrantFiled: October 19, 1977Date of Patent: December 26, 1978Assignee: Jackson Machine ProductsInventor: Walter L. Carter
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Patent number: 4079924Abstract: A shock absorber comprising a cylinder closed at one end and resiliently deformable radially outwards at a predetermined internal pressure, a resilient liner within the cylinder in intimate contact with the wall of the cylinder, a fluid-tight seal at the open end of the cylinder, a piston rod extending through the seal, a piston in the cylinder and connected to the rod and in sliding engagement with the inner wall of the liner, an impact receiving member on the free end of the rod outside the cylinder; a liquid of predetermined flow characteristics in the cylinder, and at least one zone extending over a substantial length of the stroke of the piston and having a cross section varying over at least part of the length to form a single free liquid flow path past the piston, the configuration of the zone, the flow characteristics of the liquid, the pressure in the closed end of the cylinder and the resilience of the material of at least one of the cylinder and the liner resulting in shocks being absorbed by the sType: GrantFiled: August 24, 1976Date of Patent: March 21, 1978Assignee: Road Research LimitedInventor: Gunter Persicke
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Patent number: 4078638Abstract: An oil pressure shock absorber which can be disassembled wherein an inner cylinder having a free piston fitted in it and a high pressure gas enclosed on the base end side is slidably fitted at the tip inside an outer cylinder, an oil seal is provided on their sliding contact surfaces, a plurality of orifices arranged in the axial direction are formed on the side wall of the inner cylinder inserted in the outer cylinder, an annular concave groove is formed on the inside surface of the outer cylinder so as to be opposed to the above mentioned orifices, axial concave grooves are made on the outside surface of the inner cylinder from its tip and the tip part of the inner cylinder and the interior of the outer cylinder are filled with oil, thereby a collision energy may be uniformly absorbed over the entire range of the stroke.Type: GrantFiled: January 5, 1977Date of Patent: March 14, 1978Assignee: Showa Manufacturing Co., Ltd.Inventors: Kiyosaburo Koyama, Hitoshi Okayasu
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Patent number: 4077496Abstract: A hydraulic snubber device and method of damping for railway trucks and more particularly a snubber adapted to be interposed between a bolster and a side frame member and being operative to provide a first damping rate when the railway car is operating on tangent track or at equilibrium speed on super elevated track and to provide a second relatively higher damping rate when the railway car is operating on super elevated track at low speed and in all instances of severe rocking.Type: GrantFiled: June 14, 1976Date of Patent: March 7, 1978Assignee: A. Stucki CompanyInventor: Donald Wiebe
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Patent number: 3985190Abstract: The damping arrangement includes a cylinder with various diameters in order to first attain a slow movement of the piston through the restricted position and to cause it to move faster through the enlarged portion. Such movement controls the lowering speed of the platform onto the knife edges and the slower movement is present until the platform comes into contact with the knife edges thereby preventing a damage of the knife edges.Type: GrantFiled: July 10, 1975Date of Patent: October 12, 1976Assignee: August Sauter GmbHInventors: Manfred Kammerer, Johann Tikart
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Patent number: 3944198Abstract: An impact absorber for an automobile bumper includes a first cylinder having a closed end and filled with a damping liquid. A second cylinder, closed at one end and having a radial partition wall therein, moves within the first cylinder for transmitting an impact force to the damping liquid. A sealing member is secured to the inner part of the first cylinder to define a first chamber with the first and second cylinders. A plurality of throttling ports are provided on the second cylinder for expelling the damping liquid from the first chamber thereby providing a variable orifice effect in cooperation with the sealing member upon movement of the second cylinder for dampening the impact force. A second chamber is provided for receiving the expelled damping liquid. The expelled damping liquid, within the second chamber, urges a piston to slidably move within the second cylinder toward the direction opposite the first chamber.Type: GrantFiled: December 2, 1974Date of Patent: March 16, 1976Assignee: Aisin Seiki Kabushiki KaishaInventor: Mitsuhiro Sakamoto