Abstract: A contacting and sealing structure, for electrical continuity, noise reduction and leakage reduction between parts that move in relation to each other at the ends of the cavity within a hydraulic cylinder employing electromagnetic wave position sensing, is provided by employing two springs having garter and canted coil spring functions that are retained in side by side grooves in one of the parts so that the spring coils extend directly across the intersection of the parts.
October 11, 1994
Date of Patent:
July 30, 1996
Wayne W. Lark, Denny Morgan, James R. Turba
Abstract: The device according to the invention includes at least one rotational actuator fitted with a return spring and a connecting rod connected to the rotational actuator to transmit a linear movement to a mechanical part. The rotational actuator is moved by a rotational electromagnet whose angular position is controlled by a pulsed, periodic current. The device also includes apparatus for removal of the magnetizing energy stored in the electromagnet.
Abstract: Apparatus for training an operator in use of electrohydraulics that includes an electric-motor/hydraulic-pump with an integrated fluid sump mounted on a portable support. An electrohydraulic valve on the support is preconnected to the pump, and has at least one solenoid valve responsive to valve control signals for controlling the valve to supply fluid from the pump. A hydraulic cylinder is carried on the support and preconnected to the valve for generating mechanical motion as a function of fluid supplied by the valve from the pump. An electronic controller is mounted on the support. A plurality of electrical connectors are mounted on an operator panel on the support and individually preconnected behind the operator panel to the valve controller, to the solenoid of the electrohydraulic valve and to a mechanism on the panel for generating an operator command signal.
August 2, 1993
Date of Patent:
November 15, 1994
Richard J. Kotch, John A. O'Brien, George A. McConnell
Abstract: A magnetically actuated fluid motor has a shiftable member having valve members for alternately closing one and opening the other of large and smaller faces of a stepped piston reciprocating in a housing. The shiftable member carries a magnet and is shiftable to collocate the magnet with one of spaced apart magnet attractors. A magnetic holding force between the magnet and attractors exceeds a simultaneous resilient counterforce supplied by spring members operating on the shiftable member. When the magnetic holding force is weakened by application of a separating force to separate the magnet from an attractor, stored energy in the compressed springs is released to shift the shiftable member. Separating force is applied through stops which arrest the shiftable member while the piston continues to move, without immediately opening the closed face of the stepped piston.
Abstract: A linear actuator used in moving, for example, gate valves, sluice gates and the like, wherein an increased thrust is required during initial movement. The present invention includes, as part of the linear actuator, a novel booster piston movably disposed about a piston rod; further included on the booster piston is a thrust column disposed radially between the booster piston and the piston rod so as to define an annular fluid channel for enabling fluid to move upwardly so as to contribute a substantial additional thrust component to move the primary piston.
Abstract: An apparatus is adapted to detect the linear extension, velocity and acceleration of a hydraulic cylinder. The hydraulic cylinder defines a variable length coaxial resonant cavity. Under the control of a controller, an RF transmitting section and an RF receiving section are used to determine the resonant frequency of the cavity. The receiving section includes an equalizer circuit for compensating for the insertion losses of the hydraulic cylinder. The linear extension of the cylinder is determined as a function of the resonant frequency.
Abstract: Cylinder position sensor apparatuses are useful for monitoring the location of a piston within a hydraulic cylinder. The present position sensor mounting apparatus includes a resilient tubular electrical insulator positioned in a bore of a housing and has a leg of a sensor element extending therethrough. The sensor element is fixedly retained relative to the housing in one embodiment by a bolt which squeezes the insulator radially inwardly to clamp against the leg of the sensor element. In another embodiment, an insert slidably engages a tapered portion of a bore and is urged radially inwardly to squeeze the insulator inwardly to clamp against the sensor element. Thus, the insulator serves the dual purpose of electrically insulating the sensor element from the housing and the hydraulic cylinder while being utilized to clamp against the sensor element for retaining the sensor element within the housing.
Abstract: A stirrer for stirring a liquid in a container, which includes a stator; a rotor disposed in the container and provided with stirring vanes; and a cylindrical housing of nonmagnetic material having a peripheral wall thereof interposed between the stator and rotor and rotatably supporting the rotor through intervention of the liquid. This arrangement provides a stirrer of simple and compact construction, which can stir the liquid in a container completely in a closed state free of sliding portions of rotary components or shaft seal portions.
Abstract: A piston type accumulator has a detection device that informs a user about the position of the piston incorporated therein. Abnormalities in the hydraulic system operations e.g., a gas leak from a gas chamber bounded by the piston or the sudden turning on of a fluid-actuated device in the system, can cause an excessive movement of the piston; likewise, clogging of lines or the sudden stoppage of a fluid-actuated device may cause a fluid pressure rise in the system and, consequently, a displacement of the piston to actuate the detection device. In this invention, the position of the piston is detected by use of a permanent magnet that actuates a reed relay or moves a magnetic inductive indicator installed on the outside of a accumulator shell to be readily visible thereat.
Abstract: A pressure-driven engine is provided therein with an intake valve and an exhaust valve the opening and closing operations of which are controlled by a combination of the urging force of the respective springs and the attractive force of the respective magnets. The engine automatically repeats reciprocating motion merely by supplying a pressure source such as steam or various kinds of compression gas. The reciprocating motion or the rotational motion converted from the reciprocating motion is utilized as a power.
Abstract: A linear actuator comprising a linear motor, more especially in the form of a pneumatic motor, which has a housing containing an axially moving piston which is connected with an actuating rod extending out of the motor housing at a working end thereof, a control device, for instance in the form of valve means, for operation of the motor, and a sensor means responsive to certain positions of the actuating rods. In order to simplify and cheapen production of such an actuator while facilitating and speeding up installation of the linear motor, the control device and sensor device are permanently connected to form a readily handled working unit, and the control device and the sensor device are arranged on the control end, opposite to the working end, of the linear motor.
Abstract: A jack comprising a casing consisting of two flanges connected by a tubular element in which is sliding a piston connected to a rod itself slidably mounted to extend through one flange, the ends of the tubular element which is oval in cross-section as well as the piston being fast with the flanges, respectively, through a double crimping, namely a crimping of the ends of the tubular elements onto the flanges and a crimping of the flanges onto these ends.
Abstract: The electric and/or electrical sensor or detector device is intended to cooperate with a movable element surrounded by a shell, it comprises an annular clamping collar adapted to be clamped in position on a shell and connected to at least one connecting conductor, the collar carrying at least one mechanical and electrical removable member for connection to a removable detector element and the device is applied to a position detector to be quickly and removably secured onto a fluid cylinder body.
Abstract: A piston-cylinder assembly wherein in the cylinder housing there is provided a cylinder chamber extending in axial direction, in which cylinder chamber a piston is movably guided in axial direction. Both the piston and also the cylinder chamber have a cross section which is different from a circular shape. A permanent-magnet piece is arranged fixedly in the area of the outer circumference of the piston. A switch arranged in the area of the linear path of movement of the permanent-magnet piece is provided on the outside on the cylinder housing, which switch can be operated without contact by the magnetic field of the permanent-magnet piece.
Abstract: A fluid pressure oscillator is provided with a cylinder containing a piston assembly. Fluid actuated reciprocation of the piston assembly is controlled by a valve mounted externally of the cylinder. The valve is alternately shifted between "advance" and "retract" settings by a reciprocating actuating rod removably received in the cylinder. A magnet on the piston assembly cooperates with magnetic elements on the actuating rod to automatically reciprocate the latter.
Abstract: The invention provides a piston and cylinder unit comprising a piston adapted to be displaced in the axial direction, a piston rod arranged coaxially and connected with the piston on at least one axial face thereof and which extends through an associated cylinder end cover in a sealing and sliding manner. The section of the piston rod outside the piston are provided with load attachment means. The piston rod is tubular and defines a continuous bore extending essentially from one end of such rod to the other end thereof in the axial direction. The bore is provided at least at its end sections with a female threaded section. The piston end of the piston rod is provided with a threaded part connected with the piston and in the opposite external end the male threaded section of a connecting part may be screwed with is adapted to be coupled with a load attachment means to be operated by said piston and cylinder unit.
Abstract: In order to obtain a reliable position determination in a hydraulic cylinder optionally exposed to hard frost, it is suggested to mount a magnetically sensitive component in the form of a Hall-effect transducer in a bore in the cylinder wall and placed between a permanent annular magnet (17) and a magnetically conducting sheet (14). In the middle of the bore a magnetically conducting post (16) is placed and towards the inner side of the cylinder the bore is sealed by a non-magnetic material (19) e.g. brass. The Hall-effect transducer (15) forms thus part of a closed magnetic circuit comprising the permanent magnet (17), the magnetically conducting post (16), the magnetically conducting disc (14) and the hydraulic cylinder wall surrounding the bore. When the piston in the hydraulic cylinder opposes the sensor, a second closed magnetically conducting circuit is formed comprising the permanent magnet, the magnetically conducting post, the piston, and the steel wall of the cylinder.
December 29, 1987
Date of Patent:
July 11, 1989
Niels Hvilsted, Kaj Pedersen
Niels Hvilsted, Kaj Pedersen, Finn D. Christensen
Abstract: In a piston position detector for a fluid pressure cylinder operating by fluid pressure such as air pressure or oil pressure, a permanent magnet is mounted on a piston sliding in a non-magnetic cylinder, and a magnetic detection element to respond to the magnetic field formed by the permenent magnet and to generate detection signals is mounted to any position of the cylinder. A magnetic induction piece in sheet form is interposed between the cylinder and the magnetic detection element, so that when the permanent magnet faces the front of the magnetic detection element, the magnetic induction piece is magnetically saturated by performing bypass induction of only a part of the magnetic flux of the permanent magnet to act on the magnetic detection element and most of the magnetic flux acts on the magnetic detection element.
Abstract: A fluid pressure operated device comprises a body adapted for moving an article and carrying magnets coupled to other magnets on a piston movable by fluid pressure in a cylinder. The body also carries spaced magnets and another piston carries spaced magnets. In a start position, one of said body magnets and one of said piston magnets are coupled. During normal operation the body and pistons move to another position in which the one body magnet operates a return sensor to return the device to start position. If an obstacle is encountered, the piston moves to release another sensor to reverse the device for a short stroke where a timer again reverses the fluid pressure to complete the stroke. Engagement with a second obstacle or a repeat engagement with the first obstacle returns the device to the start position and a warning alerts an operator to remove the obstruction.
Abstract: In a rodless cylinder comprising a series of driving magnets mounted on a piston fitted in a cylinder tube and a series of driven magnets on a driven member sliding along the cylinder tube, piping to convey a hydraulic fluid is simplified as follows. Both ends of the cylinder tube and guide rods extending parallel thereto are fastened to two end plates. Two ports through which the hydraulic fluid is supplied to and discharged from pressure chambers on both sides of the piston in the cylinder tube are provided in one of the end plates. While one of the ports communicates directly with one pressure chamber through the end plate, the other port communicates with the other pressure chamber through one of the guide rods and the other end plate. The driven member sliding along the cylinder tube carries the series of driven magnets and two annular sliding members on both sides thereof in such a manner as to be movable in the direction perpendicular to the axis of the cylinder.
Abstract: A retention arrangement for holding an output push rod (70) in a vacuum brake booster (10). The output push rod (70) has a plastic plunger section (36) and a metal insert (70). The plastic section (36) is held in a movable wall of the brake booster by a clip member (46) while the metal insert (70) is held in the plastic plunger (36) by a magnetized rubber seal (50).
Abstract: A drive mechanism with a fluid-operable system can be adapted to a general path configuration. The mechanism includes coaxial tubes following a desired path configuration with the inner tube longitudinally slotted in a sealable manner. A fluid-actuated annular piston surrounds the inner tube and operates in the chamber between the inner and outer tubes with a member extending therefrom toward the piston center and extending in the inner tube slot. A flexible force transmission member is provided within the inner tube and extends longitudinally therein, transmitting the motion or force of the piston to a location of use.
Abstract: A device of this nature incorporates at least one control piston displaceable within a casing, the casing having at least one venting nozzle authorizing the insertion of the piston into one of its possible operating positions, which nozzle may be shut off by means of an electromagnetically operated closing device for preparation of the outward displacement of the piston out of this operating position. To accomplish that such devices may manage with a substantially reduced electrical battery power for their electromagnetic closing device, a permanent magnet is provided which co-operates with a ferromagnetic member of the closing device, in such manner that the closing device continues to be held in its closing position while the control piston is being reversed, although the supply of electrical power to the closing device had already been turned off.
Abstract: A magnetic snap-action directional control valve mechanism preferably for use with a fluid pressure actuated reciprocating motor or pump (28). A driven member, represented by a tie rod assembly (42) in the described preferred embodiment, is caused to reciprocate at the same frequency as the reciprocating motor (28) due to contact of the driven member by a sealing member within the motor as represented by a piston (36) in the described preferred embodiment. The driven member includes a magnetic area which magnetically interacts with another magnetic area on the valve core of the magnetic directional control valve, thus causing the valve core (19) to also reciprocate at the motor frequency. Due to the nature of the magnetic interaction between the magnetic areas, the valve core (19) reciprocates in a snap-action fashion.
Abstract: A rodless cylinder having a piston and an operation member slidable along the outer circumferential surface of a cylinder tube, each mounted with permanent magnets, and adapted to move the operation member along the cylinder tube by utilizing the attraction force between these permanent magnets, in which a plurality of individual magnets disposed axially to the cylinder in each of driving and driven magnet rows are arranged such that identical poles of the individual magnets are in adjacent to each other, and both of the driving and driven magnet rows are arranged such that the different poles of the individual magnets in each of the magnet rows are opposed to each other can provide a greater attraction force between the magnet rows with no changes in the size of the magnet and thereby reduce the size of the entire apparatus.
Abstract: Multiple pins are affixed in the holes of a ceramic substrate by simultaneously impacting the pins with a piston assembly which temporarily places the pins in a viscoelastic fluid state. Upon return of the pins and the resultant fluid flow to its undisturbed solid state, each pin is left with an extension that is in interlocking engaged relationship with the ceramic particles of the substrate in the region surrounding the particular holes in which the pins have been located.The piston assembly is driven by a pneumatic high pressure system which is adjustable to the number of pins being simultaneously impacted. Release of the piston assembly is delayed until the air pressure becomes stabilized prior to impact. A vacuum pressure system returns the piston to its originating position after impact whereupon the piston assembly is ready for the next impact cycle.
January 7, 1981
Date of Patent:
November 15, 1983
International Business Machines Corporation
David E. Houser, Harold Kohn, Gordon L. Williams
Abstract: A permanent magnet on a piston for use with a magnetic force pickup for sensing the position of the piston is locked in place between two backup rings and is seated within the washer of the piston. The washer has two inwardly extending flanges placed on the two axial sides of the permanent magnet between it and the backup rings.
Abstract: A fluid power driving unit for transport and other purposes is made up of an non-magnetic cylinder which may be joined up with a fluid power supply. Within the cylinder there is a glanded free piston having an inner magnetic system for moving an outer runner supported on the outside face of the cylinder, by way of a further magnetic system in the runner. The inner and outer magnetic systems are designed so as to be clear of the inner and outer faces of the cylinder. The cylinder is made up of a number of separate cylinder lengths whose ends are overlapping and furthermore each cylinder length has a stiffening and reinforcing rail, which rails are joined together at their ends and may be undone from each other if desired.
Abstract: A servo control mechanism for controlling the reciprocal movement of a piston member along the length of a curtain rod. The curtain rod is composed of a fluid pressure-tight tubular member made of a nonmagnetic material and having pressurized fluid supply ports therein adapted to supply pressure to opposite sides of the reciprocal piston member. A plurality of ring members, certain ones of which are made of magnetizable material, surround the curtain rod and are capable of movement along the length of the rod. A plurality of permanent magnets are reciprocally mounted inside the curtain rod and are magnetically coupled to certain ones of the curtain rings which are made of a magnetizable material. An elongated strand extends between the piston member and at least one of the permanent magnet members inside of the curtain rod so that a driven movement of the piston member will cause a forced movement of the permanent magnet therewith.
Abstract: In a reciprocating pump, notably a metering pump, of the reciprocating type in which the pumping member, diaphragm or piston, is actuated by means of a slide block responsive to a rotating eccentric member, a ball is interposed between an adjustment screw controlling the length of the slide block stroke and the slide block. For this purpose, the ball engages an inclined surface formed in a hollow of the slide block. Preferably, the screw is magnetized and constantly attracts the ball to avoid movements of the ball in relation to the slide block and therefore any premature wear and tear of these members. The inclined surface may have a shape matching that of the ball.
Abstract: A piston and cylinder device with a piston mounted for reciprocating movement in the cylinder has on the outside of the cylinder an elongated mounting element comprising two guiding members on each of which a limit switch is mounted for positioning longitudinally of the cylinder. The limit switch is formed with a switch blade of ferromagnetic material and the piston has an annular rim constituted of permanent magnetic material. The switches can be adjusted longitudinally for the purpose of adjusting the stroke of the piston.
Abstract: A valving member is carried within the bore of a meter body having inlet and outlet ports. Chambers are formed within the bore on opposite sides of a piston slideably disposed about the valving member. In response to movement of the piston, valving member shifts axially within the bore to establish sequential periodic communication between alternate chambers and the inlet and outlet ports. After each shift, the valving member is latched by magnetic means.