| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 091006000 | FLUID SUPPLY THROUGH DIVERSE PATHS TO SINGLE EXPANSIBLE CHAMBER | 9 |
| 20090165638 | Automatic transmission servo - A servo for hydraulically operating a brake band of an automatic transmission includes a housing having a bore engaging portion for engaging an existing servo bore in a case of the automatic transmission and an external portion for positioning externally of the servo bore, the external portion of the housing including an interior bore. The servo also includes a piston disposed in the interior bore of the external portion of the housing for reciprocating movement, the piston being externally remote from the servo bore and having an outer diameter greater than an outer diameter of the servo bore. An actuator rod for engaging and operating the brake band of the automatic transmission is attached to the piston to reciprocate with the piston. The servo connects to existing hydraulic circuits within the servo bore to supply pressurized fluid for operating the servo. | 07-02-2009 |
| 091600500 | Three or more cylinders arranged in parallel, radial or conical relationship with rotary transmission axis | 2 |
| 20160076372 | METHODS AND SYSTEM FOR INDEPENDENTLY CONTROLLING INJECTOR HEAD DRIVE MOTOR SPEEDS - A system for controlling a coiled tubing injector head includes a hydraulic control line in fluid communication with each drive motor, a valve associated with one or both hydraulic control lines, and a sensor associated with each drive motor. Each sensor is configured to output to a digital computer a signal representative of a motor speed, and at least one valve associated with a hydraulic control line is operable to regulate pressure in the hydraulic control line and thereby increase or decrease the speed of the corresponding motor until both speed sensors report substantially matching motor speeds. | 03-17-2016 |
| 20160177719 | Hydrostatic Radial Piston Machine | 06-23-2016 |
| 091012000 | Cyclically operable motor with port reversing | 1 |
| 091014000 | By shifting distributor | 1 |
| 20120036991 | Automatic pneumatic valve reset system - A cup for an air valve assembly in a positive displacement pneumatic motor includes a cup body, a gas cavity, and a first pilot slot. The cup body is rectilinear and has a sliding face as one side, and the gas cavity is concave and extends into the cup body through the sliding face and terminates within the cup body. The first pilot slot extends from the gas cavity and into the cup body through the sliding face and terminates within the cup body. | 02-16-2012 |
| 091019000 | Diverse paths used to control extent of working member travel | 1 |
| 20110048222 | PISTON ACTUATOR ASSEMBLY - A piston actuator assembly having includes a piston liner slidably disposed within a housing. A piston is slidably disposed within the piston liner and partially slidably disposed in the valve body. A plurality of pressurized fluid passages communicate with the piston actuator assembly and provide a first flow of hydraulic fluid and a second flow of hydraulic fluid. A plurality of seals maintains separate fluid pressure chambers selectively pressurized to achieve a plurality of actuator positions. A plurality of exhaust passages communicate with the piston actuator assembly providing pressure relief to allow for predictive movement of the piston and piston liner. | 03-03-2011 |
| 091020000 | Position responsive | 4 |
| 20130213212 | FLUID WORKING MACHINE VALVE ACTUATION - A fluid working machine has at least one working chamber of cyclically varying volume and low and high pressure valves to regulate the flow of working fluid into and out of the working chamber, from low and high pressure manifolds. The low and high pressure valves are actuated by electronically controlled valve actuation means which, when actuated, applies forces to the low and high pressure valve members to open and/or close the respective valves. The low and high pressure valve members are independently moveable and, although the low pressure valve member typically begins to move quickly in response to a shared valve control signal, the high pressure valve member typically moves only after a change in the pressure within the working chamber. The electronically controlled valve actuation means may be a shared electronically controlled valve actuator, such as a solenoid within a magnetic circuit which directs magnetic flux through both low pressure and high pressure valve armatures which are connected to the respective valve members. | 08-22-2013 |
| 20160160891 | Hydraulic Cylinder Structure - A hydraulic cylinder structure contains: a hydraulic cylinder including a movable piston rod, a connecting seat, and an oil tank having an outer tube and an inner tube. The piston rod is hollow and is fitted with a guiding tube of the connecting seat, and a pump of the connecting seat has an oil feeding pipe for outputting hydraulic oil. The oil feeding pipe is in connection with the guiding tube, an on/off valve, a pressure adjusting valve, and a safety valve. The pressure adjusting valve is coupled with an oil path of a push piston, and the oil path is joined with an auxiliary path and the on/off valve for drawing the hydraulic oil out of the oil tank via a single-direction valve, and the on/off valve and the safety valve are connected with the oil tank. | 06-09-2016 |
| 091024000 | Additional inlet path opened in response to position | 1 |
| 20160010667 | HYDRAULIC TOOLS WITH RAPID ADVANCE | 01-14-2016 |
| 091027000 | Plural simultaneous paths, one cutoff in response to position | 1 |
| 20140033909 | METHODS AND APPARATUS TO CONTROL MOVEMENT OF A COMPONENT - Methods and apparatus to control movement of a component are disclosed herein. An example apparatus includes a housing defining a bore and a piston disposed inside the bore. The piston is to be coupled to a movable component disposed outside of the bore. The example apparatus further includes a fluid flowline in fluid communication with a first chamber of the bore and a second chamber of the bore. The first chamber is on a first side of the piston, and the second chamber on a second side of the piston. The example apparatus also includes a valve to control fluid flow through the fluid flowline. The valve is to be in a first state to enable the piston to dampen movement of the component, and the valve is to be in a second state to enable the piston to hold the component substantially stationary. | 02-06-2014 |
