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| Number | Title | Issue Date |
| 7201547 | Opening actuator for collet chuck A chuck actuator has a hollow housing having a chamber and having a front end and a rear end. A ring in the chamber forms with the front end thereof a front compartment and a piston in the chamber between the ring and the rear end forms an intermediate compartment w... | 04/10/2007 |
| 7171888 | Hydraulic cylinder A hydraulic cylinder comprising a cylinder, a piston which is adjustable in the cylinder, and at least one pressure connection which is disposed in the vicinity of an end position of the piston and through which a pressure fluid can be introduced into the cylinder, ... | 02/06/2007 |
| 7121185 | Hydraulic cylinder having a snubbing valve A hydraulic cylinder has a tube with a first end and a section end. The hydraulic cylinder also has a piston assembly movably disposed within the tube and configured to move between the first and second ends of the tube. The hydraulic cylinder further has a valve pl... | 10/17/2006 |
| 7108255 | Locking mechanism for locating pin with integrated clamp A locking mechanism for a locating and clamping fixture is provided, wherein the locking mechanism comprises a drive pin that is linearly positionable along a first axis. The drive pin comprises a driver portion and a driven portion, wherein the driver portion is co... | 09/19/2006 |
| 7017895 | Positioning and clamping device A locating pin is mounted on a hollow post member in such a manner that a slit of the locating pin is communicated with an interior of the post member. A clamp arm is axially movably received in the slit and has a hook-shaped head exposed to an upper portion of the ... | 03/28/2006 |
| 6931980 | Pneumatic device with cushioning mechanism The present invention is directed to a cushioning apparatus for a pneumatic device. The cushioning apparatus generally comprises a body, wherein a piston and cylinder reside therein, wherein the piston is operable to translate along a first axis. A first port associ... | 08/23/2005 |
| 6698817 | Variable rate covering system for open top vehicle containers A variable rate covering system for open top vehicle containers includes a hydraulic actuating system for pivoting arms carrying a roll up cover wherein the fluid flow rates to the hydraulic cylinders are reduced during the initial and final phases of the... | 03/02/2004 |
| 6481331 | Working cylinder actuated by hydraulic fluid A pressure medium-actuated working cylinder axially displaceable between two end positions in a cylinder space, with opposite changes in, the volumes of two cylinder chambers on its two sides. A damping element is arranged on one side of a piston. A passa... | 11/19/2002 |
| 6386088 | Hydraulic cylinder A hydraulic cylinder in which a recess (21) is formed in a piston rod (3) side end surface (20) of a piston (4) so that the recess (21) serves as an axial fitting portion, and an end of the piston rod (3) is fitted into the recess (21) of the piston (4) t... | 05/14/2002 |
| 6071096 | Pneumatic cylinder, in particular for actuating fume extraction valves in fume and heat extraction plants A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be made to slide by pressurised air in a cylinder (1) with at... | 06/06/2000 |
| 6047627 | Piston end dampening A pressure medium driven device has a cylinder having a cylinder tube, means forming a discharge outlet for a pressure medium, a piston movable in the cylinder over a stroke having a stroke end which is dampened by a counter pressure generated by throttli... | 04/11/2000 |
| 6000314 | Cylinder with speed control mechanism A cylinder with a speed control mechanism wherein in a transfer stroke, a piston is smoothly accelerated or smoothly decelerated at an initiation or termination end of the stroke by controlling the speed of the piston, whereas in a return stroke, the spee... | 12/14/1999 |
| 4862786 | Fluid cylinder cushioning system A cushioning system for a fluid power cylinder includes a first passage for the flow of fluid to and from the space between the piston and end cap closure of the cylinder, and a second passage including a throttling valve for throttling the flow of fluid ... | 09/05/1989 |
| 4807514 | Differential hydraulic jack with damping system for the control of electric circuit-breakers A differential hydraulic jack with a damping system for the control of electric circuit-breakers is provided with a floating ring which produces a damping action at the end of travel and is also provided with a damping extension stud which forms part of t... | 02/28/1989 |
| 4796461 | Hydraulic crimping tool The hydraulic crimping tool includes a piston follower mechanism to provide an automatically sequentially reduced crimping force and extent of crimping deformation in predetermined manner in dependence on the extent of travel of a movable crimping jaw tow... | 01/10/1989 |
| 4651623 | Work cylinder having a piston member with an integral cushioning arrangement A work cylinder having a piston of single-body construction and a cushioning arrangement integrally formed on the piston includes a cylinder housing having a chamber formed therein divided into first and second work chambers by the piston. First and secon... | 03/24/1987 |
| 4638717 | Combination of cushion, adjuster and side ports in a single unit rotary actuator A rotary actuator having a piston travel adjustment mechanism and a cushioning mechanism associated in a single attached unit, with side porting for fluid pressure, thus having a more compact structure that is lighter in weight and yet completely adjustab... | 01/27/1987 |
| 4638718 | Fluid-pressure driving device A fluid-pressure driving device including a main actuator unit having a piston adapted to travel a full part of a predetermined stroke and an accelerating actuator unit having a piston adapted to travel only a part of the stroke and being capable of opera... | 01/27/1987 |
| 4565115 | Hydraulic distributor for assistance power motor with return to rest position The distributor defines two parallel fluid circuits (15, 16) each including serially arranged first (1;1') and second (2;2') valve means actuated by the primary control member (OP) of the distributor, two distribution lines (17, 18) for selectively supply... | 01/21/1986 |
| 4517878 | Shock absorbing device for hydraulic cylinder A shock absorbing device for a hydraulic cylinder including a shock absorbing hole formed in an end wall of cylinder, a passageway having a port opening in the shock absorbing hole at its inner peripheral surface and a shock absorbing member attached to t... | 05/21/1985 |
| 4506591 | Ocean floor dredge system having a pneumohydraulic means suitable for providing tripping and heave compensation modes There is provided a hoist as for an ocean floor dredging operation, which is capable of providing hydraulic heavy lifting capacity, for raising or lowering the dredging means between a surface ship and the ocean floor, and further can routinely provide th... | 03/26/1985 |
| 4469010 | Motion dampening seat suspension system A system for resiliently supporting a load at a reference height includes a hydraulic cylinder for resiliently supporting a load about a reference height and an accumulator which cooperates with the cylinder for flowing hydraulic fluid therebetween in res... | 09/04/1984 |
| 4462426 | Valve arrangement A poppet valve assembly includes a valving element in the form of a freely slidable poppet, a freely slidable pilot piston having an elongated integral pin extending axially toward the poppet, but unconnected thereto, and an integral elongated spear, with... | 07/31/1984 |
| 4458717 | Cylinder cushion seal A synthetic plastic cushion seal for an expansible chamber motor usable with either an air or oil pressurized medium, the seal having reduced friction characteristics, being of a concise configuration and utilizing radial and axial channels to facilitate ... | 07/10/1984 |
| 4424737 | Stroke cushioning apparatus for hydraulic cylinders A stroke cushioning apparatus for a hydraulic cylinder provided at rod side stroke end and/or head side stroke end. The rod side stroke end cushioning apparatus comprises a sleeve mounted on a piston rod and a cushion ring mounted on the inner face of a h... | 01/10/1984 |
| 4404892 | Hydraulic operating apparatus A hydraulic operating apparatus including an actuating cylinder having a piston arranged therein and moved by a fluid under high pressure further includes a control valve having only one metallic seal whether the piston is at its upper or lower positions.... | 09/20/1983 |
| 4386555 | Hydraulic cylinder cushion device The disclosure is directed to a hydraulic cylinder with an improved cushion device thereon to enhance the operational characteristics thereof. A cushion pin is affixed to the cylinder piston by a cap screw in such a manner that the cushion pin can float a... | 06/07/1983 |
| 4373426 | Rotary actuator A helical rotary actuator has a torque transmitting section that can be a sealing section or a clearance section but which is welded to a ring gear so that torque forces imposed on the ring gear can be carried through the torque transmitting section to th... | 02/15/1983 |
| 4352318 | Expandable cushion plunger for piston and cylinder devices An expandable cushion plunger for use with a fluid pressure driven piston and cylinder device includes a cushion sleeve mounted on a piston rod in floating relation thereto, and having a skirt, the interior of which is exposed to the cushioning fluid with... | 10/05/1982 |
| 4296675 | Cylinder cushion with contractable ring A fluid pressure actuator consisting of piston structure reciprocal within a cylinder pressurized through ports at the cylinder ends wherein cushioning means is mounted upon the piston structure controlling the flow of fluid through the ports producing co... | 10/27/1981 |
| 4283990 | Fluidic repeater Two fluid passages are connected through flow restrictors to a fluid supply. Downstream of the restrictors the fluid supply has a drooping pressure-load characteristic. Venting means for the fluid passages comprises vent openings therein downstream of the... | 08/18/1981 |
| 4230024 | Adjustable stroke cylinder An adjustable stroke piston and cylinder combination including a piston fixed to one end of a piston rod that extends from one end of the cylinder, and an auxiliary piston is in sealed engagement with the cylinder means and the piston rod and is slidable ... | 10/28/1980 |
| 4064788 | Cushioning means for hydraulic cylinder Cushioning means for cushioning the end portion of the stroke of a piston in a cylinder comprising a stepped cushioning member or spear which enters a cylinder head bore to form therewith an annular orifice which successively decreases in area and gradual... | 12/27/1977 |
| 4033235 | Fluid operated ram The invention is concerned with an improved fluid operated hydraulic ram wherein the travel of the piston thereof is cushioned to reduce impact by progressively restricting fluid flow. The ram of the invention comprises a housing defining a generally cyli... | 07/05/1977 |
| 4026523 | Hydraulic jacks The invention relates to hydraulic jack operating systems. The end-of-stroke damping of the jack is produced by an element of the shape of a truncated cone, integral with the stem of the jack, which penetrates into a floating ring and which defines, in th... | 05/31/1977 |
| 3999464 | Fluid actuator device for a high-voltage power circuit breaker A fluid actuating device for an electric switching apparatus such as a high-voltage power circuit breaker or the like includes an actuator for actuating the electric switching apparatus. The actuator includes a cylinder and an actuator differential piston... | 12/28/1976 |
| 3974910 | Fluid cylinder decelerating means A piston and cylinder actuator is disclosed embodying means to control the acceleration and deceleration of the piston as it approaches the ends of its stroke. Such actuator is also disclosed as an intermittent drive for a machine system in which at least... | 08/17/1976 |
| 3969990 | Self-snubbing miniature piston assembly A miniature piston assembly composed of an elongated cylinder containing a piston head which may be displaced in response to digital hydraulic signals or otherwise and which is arranged to provide self-snubbing without requiring check valves. In the side ... | 07/20/1976 |
| 3964370 | Cushioning means for hydraulic cylinder Cushioning means for cushioning the end portion of the stroke of a piston in a cylinder comprising a stepped cylindrical member which enters a cylinder head bore to form therewith an annular orifice which successively decreases in area and increases in le... | 06/22/1976 |
