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| Number | Title | Issue Date |
| 7207116 | Air saw A main spindle of an air saw is reciprocated by sliding a piston in a cylinder chamber with the pressure of air supplied to the cylinder chamber via an air supply path so as to alternately apply the air pressure to pressure-receiving surfaces of a back plate and a f... | 04/24/2007 |
| 7162944 | Continuous reciprocating linear motion device A linear fluid piston device not requiring a fluid valve to operate and has operating piston stroke capabilities beyond traditional vibration fluid devices. The linear fluid device features (a) a movable piston means for linear motion, (b) a feature wherein said bod... | 01/16/2007 |
| 7156190 | Impact tool An impact tool has a slidable hammer that is driven by hydraulic oil under pressure inside a chamber. The hydraulic oil is pressurized by a piston driven by compressed gas on the opposite side of the piston from the hydraulic oil. The gas in the gas chamber is compr... | 01/02/2007 |
| 7147442 | Automatic oil pump, with a valved pumping piston and a valved driving piston unit An automatic oil pump includes a drive chamber, having a reciprocal driving device, and an oil chamber, having a sucking device, located on two sides of a main body. The reciprocal driving device has a piston unit having a valve chamber at its center and a balance v... | 12/12/2006 |
| 6745664 | Paint shaker and motor therefor A paint shaker and motor therefor. A yoke has at a first end a clamp for clamping a paint can and at a second end, is pivotally connected to a linkage assembly that converts the linear motion of a reciprocating linear motor to an arcing motion of the yoke. The motor... | 06/08/2004 |
| 6684753 | Reciprocating differential hydraulic machine, especially a differential hydraulic machine A hydraulic machine comprising the following: an envelope (2); a differential piston (15) consisting of two parts (15a,15b) which have a different diameter and are able to move in two corresponding chambers (7,6); hydraulic switching means which are drive... | 02/03/2004 |
| 6663360 | Fluid injection pump with internal air actuator valve A injection pump includes a needle valve which is disposed in the pump body cap. An air actuator valve is disposed in the pump piston head. The amount of air fed is controlled by the gap between the needle valve and a needle valve seat which is also locat... | 12/16/2003 |
| 6520076 | Oil pressure device An oil pressure device is disposed on a hoist frame. The hoist frame has an upper panel and a middle panel. An oil cylinder is disposed on the upper panel. The oil pressure device has a pneumatic pump having a lower cover and a pneumatic cylinder, a base ... | 02/18/2003 |
| 6505538 | Multicylinder self-starting uniflow engine An improved uniflow engine has a plurality of vertically extending cylinders distributed in-line along a horizontally extending common crankshaft connected to pistons reciprocating in the cylinders. A working fluid vapor is supplied to those cylinders in ... | 01/14/2003 |
| 6499384 | Piston apparatus for gas/liquid pipeline A reciprocating fluid driven apparatus has a hollow elongate barrel with an inlet and an outlet in fluid communication with portions of a pipeline, a piston reciprocating within the barrel and having a through hole for fluid communication between spaces a... | 12/31/2002 |
| 6415704 | Pneumatic oil pump A pneumatic oil pump has a cylinder, a piston, a pedal and an oil reservoir. The cylinder has a central bore, a sealed front end and a sealed rear end. An air connector is mounted in a cover on the front end of the cylinder. An actuating valve is mounted ... | 07/09/2002 |
| 6398527 | Reciprocating motor with uni-directional fluid flow A double-acting reciprocating motor with uni-directional fluid flow path comprises a piston disposed within a cylinder. A first chamber is defined by the cylinder space between the piston and a cylinder base. A second chamber is defined by the cylinder sp... | 06/04/2002 |
| 6266847 | Door operator and process for operation of a door operator A door closer assembly and a method for operating a door closer assembly. The door closer assembly includes a housing and a door piston guided in the housing. The door piston is operably connected to move a door. A spring piston is guided in the housing a... | 07/31/2001 |
| 6065387 | Piston apparatus for gas/liquid pipeline A reciprocating fluid driven motor apparatus is provided for operating within a pipeline system carrying fluid under pressure to harness some of the energy stored in the presssurized fluid and convert it into mechanical motion for performing other desired... | 05/23/2000 |
| 6012377 | Shuttle valve of a reciprocating pneumatic motor for hydraulics A shuttle valve mounted between a pneumatic piston and a ring plate in a reciprocating pneumatic motor and moved to control the passage between a shuttle compression chamber and a radial air inlet hole in the pneumatic piston, the shuttle valve having a p... | 01/11/2000 |
| 5806403 | Multicylinder self-starting uniflow engine A uniflow engine has a plurality of cylinders disposed symmetrically around a common crankshaft connected to pistons reciprocating in the cylinders. In response to the availability of a working fluid vapor at a predetermined condition, such as a high pres... | 09/15/1998 |
| 5683230 | Pressure medium driven device performing linear motion A pressure medium operated device generating to-and-fro motion to one or several pistons or a similar motion transmitting arm. The device includes a primary piston to which motion is brought in transmitting pressure medium alternately to both sides of the... | 11/04/1997 |
| 5540136 | Reciprocating piston motor operating on pressure medium The invention relates to a reciprocating piston motor. The motor comprises at least one cylinder which is closed on at least one end, a piston which is slidable in the cylinder and forms a pressure chamber with the closed end of the cylinder, a power tran... | 07/30/1996 |
| 5513963 | Direct action fluid motor and injection pump A direct action fluid motor and injection pump is disclosed which injects small quantities of a second fluid into a primary fluid stream. A housing has an inlet and an outlet connected to a primary fluid conduit. The housing contains a stepped piston whic... | 05/07/1996 |
| 5341723 | Reciprocating pneumatic motor for hydraulics A reciprocating pneumatic motor for hydraulics has a pair of guide grooves on the inner wall of a cylinder provided, together with a pneumatic piston and a shuttle valve to function pneumatically. The piston has a seal ring which passes the guide grooves ... | 08/30/1994 |
| 5275085 | Control device for pneumatic cylinder A device for controlling a pneumatic cylinder device, being of a double cylinder construction comprising an outer cylinder and an inner cylinder sealably fitted in the outer cylinder to slide along the outer cylinder. In the inner cylinder, a piston with ... | 01/04/1994 |
| 5243897 | Magnetically actuated fluid motor 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 shift... | 09/14/1993 |
| 5209152 | Airfoil changeover device An air operated reciprocating piston pump having a differential area piston is provided with an annular shaped airfoil device having a chevron cross-section and which is located beneath the bottom air intake plate to utilize increasing air velocity at the... | 05/11/1993 |
| 5203251 | Motor with spring elements formed on valve assembly The present invention relates to a valve assembly (10) which is mounted on a part (piston unit 40) of an air motor (10) arranged for reciprocating movement in a housing (cylinder 12). The valve assembly includes a first valve unit (50), which is mounted o... | 04/20/1993 |
| 5197285 | Modular digital actuator A modular digital actuator is formed by interconnecting a plurality of modules. Each of the modules includes a housing having a pair of different sized axially extending cylinder sections in which is received a T-shaped piston with the top of the T mating... | 03/30/1993 |
| 5188518 | Pumping device driven by a fluid driven reciprocating actuator A reciprocating actuator is axially connected to drive a reciprocating pump. An exhaust tube, open to the outside, passes through a piston of the reciprocating actuator and into an inner hole axially disposed in a working rod that connects an actuator pis... | 02/23/1993 |
| 5137435 | Compression spring fluid motor A reciprocating primary fluid driven motor has a stepped piston in a housing having a center hanging actuator rod which extends into the piston to periodically cooperate with an axially shiftable connector member in the piston which operates valves which ... | 08/11/1992 |
| 5120202 | Switching device for reciprocating pumps The objective of the present invention is to provide a reciprocation switching device for a pump which will solve problems of conventional devices such as that, because coil springs are used for activating by their snap action valve operators or switching... | 06/09/1992 |
| 5065824 | Hydraulically powered repetitive impact hammer An impact hammer according to this invention has a frame to house its actuating mechanism and to support a working impact tool which is to receive a sharp impact blow from the impact hammer and deliver it to a structure or formation that is to be pierced ... | 11/19/1991 |
| 5002468 | Switching device for reciprocating pumps The objective of the present invention is to provide a reciprocation switching device for a pump which will solve problems of conventional devices such as that, because coil springs are used for activating by their snap action valve operators or switching... | 03/26/1991 |
| 4955923 | Hydraulically operated dockboard A hydraulically operated dockboard including a ramp which is hinged at its rear edge to the frame of the dockboard, and a lip is hinged to the forward edge of the ramp and can be pivoted between a downwardly hanging pendant position and an extended positi... | 09/11/1990 |
| 4949622 | Fluid operable engine A fluid operable engine has a cylinder in which a piston slides up and down. The cylinder has a cylindrical wall and two end walls. The piston divides the cylinder into two chambers. The piston is hollow, has a cylindrical wall and two end walls, with a r... | 08/21/1990 |
| 4895305 | Oscillating piston driven sprinkler A sprinkler, connected to a water supply conduit, oscillates by the force of a piston moving in a cylinder and powered by water bleed in a bypass line from the water supply to the cylinder. The piston is connected to a rack which is engaged with a pinion ... | 01/23/1990 |
| 4879943 | Expansible chamber motor with snap-acting valve This invention relates to an air motor having a snap-acting overcentering spring mechanism for snapping the valving of the air motor between first and second positions as the piston completes each stroke in the cylinder to ensure reliable stall-free opera... | 11/14/1989 |
| 4807321 | Air cleaning system This invention relates to a novel system for removing foreign particles from a machine part, and, more particularly, to a system for cleaning meat by-products from meat processing rollers or other equipment.... | 02/28/1989 |
| 4756329 | Devices for the injection of an additive product metered into a main fluid The invention relates to a device for injecting a metered product into a main circulation of liquid, comprising a metering piston (28) coupled to a stepped piston (11) whose motion results from the pressure of the main fluid in a known manner. The piston ... | 07/12/1988 |
| 4743171 | Marine installation including fuel/oil mixing device An apparatus comprising a housing, a wall dividing the housing into high and low pressure chambers having a pressure differential therebetween, the wall including a surface partially defining the high pressure chamber, and a passage communicating with the... | 05/10/1988 |
| 4660658 | Hydraulic down-the-hole rock drill Pressurized water is used to operate a percussive down-the-hole drill and the spent motive fluid is used as a flushing fluid. A rear cylinder chamber (24) is constantly pressurized and a valve (28) controls the inlet from the chamber (24) to a bore (23) t... | 04/28/1987 |
| 4587732 | Cable cutting and crimping A novel hydraulic tool used to cut cables, rods, bars and the like or crimp various items such as cable connectors and which is operated manually and with ease by a single man. The improved cable cutting hydraulic tool comprises dual manually held handles... | 05/13/1986 |
| 4544335 | Piston and valve assembly A downhole hydraulically actuated pump assembly of either the free or fixed type lifts formation fluid from the bottom of a borehole to the surface of the ground. The downhole pump has a power piston which actuates a production plunger. A valve means is c... | 10/01/1985 |
