Class / Patent application number | Description | Number of patent applications / Date published |
092031000 | RECTILINEARLY MOVING WORKING MEMBER AND COAXIAL OR PARALLEL ELEMENT SLIDABLY INTERENGAGED FOR RELATIVE ROTARY MOVEMENT | 16 |
20090101002 | CLOSED WAVE SHAPED GROOVE - A mechanism transforms a longitudinal reciprocation movement of a piston in a cylinder into a combined unidirectional rotation and reciprocating movement of the piston. In order to achieve this transformation the piston includes a closed wave shaped groove on its circumference. The closed wave shaped groove has recesses at its apexes. The recesses break the symmetry of the groove. Balls that are located in the cylinder protrude into the groove. When the piston is reciprocating, the groove slides on the balls. A flexible heat shrink ring secures the balls in place and assures that the balls are constantly biased toward the face of the groove. | 04-23-2009 |
20090205486 | Fluid Operated Rotary Drive - A fluid operated rotary drive comprises a drive housing ( | 08-20-2009 |
20090217815 | Pneumatic or Hydraulic Cylinder - A pneumatic or hydraulic cylinder ( | 09-03-2009 |
20110030550 | HYDRAULIC DRIVEN TURNING DEVICE - Hydraulic driven turning device to be installed to a construction machine, like at the end of the boom of the power shovel whereupon a first body ( | 02-10-2011 |
20110259188 | Axially rotating free piston - A piston slidably engaged in relation to the longitudinal axis of a shaft rotationally journaled proximate opposed ends to a housing which allows reciprocal travel of the piston within a cylinder of the housing with the external surface of the piston and the internal surface of the cylinder providing mated portions of a piston rotation generation assembly which induces rotation of the piston within the cylinder during reciprocal travel of the piston along the length of the shaft with the piston having rotationally fixed engagement with the shaft such that rotation of the piston within the cylinder generates a corresponding rotation of the shaft. | 10-27-2011 |
20130167712 | CYLINDER - A cylinder includes a cylinder body assembly, a piston assembly, and a cylinder rod. The cylinder body assembly includes a cylinder body with an inlet and an outlet. The piston assembly includes a piston that is capable of moving axially and a rotation pin. A helical rotation groove is defined in the cylinder rod. The piston is sleeved on the cylinder rod via the rotation pin. One end of the rotation pin is connected to the piston, and the other end of the rotation pin is located in the rotation groove, such that the cylinder rod is rotatable in the piston. | 07-04-2013 |
20130233166 | ROTATIONAL HYDRAULIC JOINTS - A rotational hydraulic joint may include an extension chamber and a retraction chamber. Each chamber may include an end cap and a piston that moves relative to the end cap. One or more ports may add and remove fluid from the chamber. The rotational hydraulic joint may rotate in a cyclical direction when fluid is added to the extension chamber and in a countercyclical direction when fluid is added to the retraction chamber. The chambers may each include a torus-shaped cavity. Bladders may prevent fluid from leaking out of the rotational hydraulic joint. Stationary and movable electrodes may be coupled to the end cap and piston respectively. A plurality of rotational hydraulic joints may be combined to create a compound joint. | 09-12-2013 |
20160047401 | OIL PUMP - The present invention relates to an oil pump for use in and attached to a device (e.g., chain saw) having an oil-supplied portion requiring an oil supply. An oil pump supplies lubricating oil to a guide groove of a guide bar in such a manner that a plunger having a gear portion meshing with a drive worm provided on a chain saw reciprocally moves in a pump body while rotating. Two guide pins for positioning an oil pump when attaching the oil pump to a chain saw body are provided on an attachment surface of the pump body to the chain saw body. The two guide pins are spaced apart in an axial direction of the plunger, each disposed on a centerline of a transverse cross section of the plunger. | 02-18-2016 |
092032000 | Working fluid-actuated interengaging means permits unidirectional rotation of element relative to fixed part | 2 |
20120024147 | CO-AXIAL CRANKLESS ENGINE - A co-axial crankless engine ( | 02-02-2012 |
20130104729 | ROTARY ACTUATOR | 05-02-2013 |
092033000 | Element extends through working member portion | 6 |
20090007774 | AIRCRAFT ACTUATOR PISTON | 01-08-2009 |
20100037763 | ADJUSTING DEVICE - Adjusting device which has a main cylinder ( | 02-18-2010 |
20140238230 | Rotary Piston Type Actuator - A rotary actuator includes a first housing defining a first arcuate chamber having a first cavity, a first fluid port in fluid communication with the first cavity, and an open end. A rotor assembly is rotatably journaled in the first housing and having a rotary output shaft and a first rotor arm extending radially outward from the rotary output shaft. An arcuate-shaped first piston is disposed in the first housing for reciprocal movement in the first arcuate chamber through the open end, wherein a first seal, the first cavity, and the first piston define a first pressure chamber, and a first portion of the first piston contacts the first rotor arm. | 08-28-2014 |
20140238231 | Rotary Piston Type Actuator with Hydraulic Supply - A rotary actuator includes a housing defining a first arcuate chamber comprising a cavity, a fluid port in fluid communication with the cavity, and an open end. A rotor assembly in the housing includes an output shaft and a rotor arm extending radially outward from the output shaft. An arcuate-shaped piston is disposed in the housing for movement in the arcuate chamber. The rotary actuator includes a fluid line is coupled to the fluid port, a high pressure fluid line, a low pressure fluid line, and a central pressure source coupled to the high pressure fluid line. A servo valve is positioned between the central pressure source and the hydraulic actuator and is controllable to selectively connect the fluid line to the high pressure fluid line and the low pressure fluid line to control movement of the hydraulic actuator. | 08-28-2014 |
20150143989 | Actuating Device for a Rotatable Closure Part of a Valve - The invention relates to an actuating device for a rotatable closure part of a valve, in particular a pneumatically or hydraulically actuatable rotary drive for a disk or throttle valve, with a housing, in which a drive piston that is sealed from a cylindrical housing casing is arranged and is suppliable on one side with a pressurizing medium, which preferably has a tubular piston skirt, with a drive shaft, which is guided on one side out of the housing and drives in a rotating manner the closure part indirectly or directly, wherein the drive piston executes either an axial shift movement against the effect of at least one return spring in the case of a one-sided supply with the pressurizing medium or a back and forth shift movement in the case of an alternating supply with a pressurizing medium, wherein the piston skirt experiences an axially oriented guidance in the housing via at least one axial groove formed in it, into which a straight-line guide cam permanently connected with the housing engages, and wherein the piston skirt has at least one helical groove arranged in it, into which a drive bolt permanently arranged on or in the drive shaft is arranged, so that the radially and axially mounted drive shaft experiences a rotation around the axis of rotation due to the axial shift movement of the drive piston oriented in the direction of its axis of rotation. | 05-28-2015 |
20150377261 | Pressure Generator for a Hydraulic Vehicle Brake System - A pressure generator for a hydraulic vehicle brake system includes a piston-cylinder unit, a piston, a ball screw drive configured to move the piston, an electric hollow-shaft motor that surrounds and is configured to drive the ball screw drive, and a planetary gear set configured to transmit a rotational movement of the hollow-shaft motor to the ball screw drive. The generator also includes a flange part, a sleeve, and an axial needle-roller bearing. The flange part has a tubular collar configured to axially guide the piston in a movable fashion therein. The sleeve has a flange configured as a counterbearing which is attached to an interior of the tubular collar, and is further configured to support the bearing. The bearing is configured to rotatably mount and axially support the ball screw drive. | 12-31-2015 |