Abstract: The present disclosure provides a closure driving mechanism and a medical stapler including the same. The closure driving mechanism includes a driving part and a cylinder body, the driving part is connected with a closure pulling sheet of the stapler, and a cavity provided with a one-way valve is formed inside the cylinder body. When the driving part moves toward a distal side of the stapler, a volume of the cavity is decreased, the one-way valve is closed, and the driving part drives the closure pulling sheet to move distally, so as to open a head assembly of the stapler. Since the driving part is subjected to a resistance of compressed air in the cavity, a movement speed of the driving part is decreased, and the head assembly is opened slowly to prevent a force of opening the head assembly being too large to damage surrounding tissues.

Abstract: The invention relates to a neutral setting apparatus for adjustable hydraulic machines, in particular the adjustment of the neutral position of a servo valve. In particular, the invention relates to servo adjustment devices with mechanically adjustable control pistons, wherein the forces necessary for this can be applied mechanically, electro-magnetically, pneumatically or hydraulically. The invention relates to a neutral setting apparatus of an adjustable hydraulic machine, with a housing in which a mounted input shaft is arranged, to one end of which a torque can be applied for rotating the input shaft about an axis. Thus providing a robust and cost-effective setting mechanism for the neutral position of a servo valve.

Abstract: A multi-purpose hydraulic tool of the open center and closed center type is provided with an OC/CC knob mounted on the trigger activated spool. The spool has a knob which can be turned to easily move between OC and CC operating conditions, without the use of additional tools. A check spool assembly works in conjunction with spool assembly in the open-center condition to provide for release of oil at the end of the return stroke. Adapters are provided so that crimping heads can be easily interchanged.

Abstract: A mechanism is provided for use with a hydraulic control mechanism of a hydraulic tool. The hydraulic control mechanism is attached to the hydraulic tool to provide a desired hydraulically powered function. The mechanism allows the hydraulic control mechanism to be used with either a constant volume hydraulic system or a constant pressure hydraulic system. The mechanism provides a valve chamber and a valve member positioned within the valve chamber. The valve chamber communicates with both a central passageway and a cross passageway of the hydraulic control mechanism. The valve chamber defines a valve seat proximate to one of the central and cross passageways. The valve member is displaceable within the valve chamber and is configured such that, depending on the position of the valve member within the valve chamber, the hydraulic control mechanism can be used with either a constant volume hydraulic system or a constant pressure hydraulic system.

Abstract: In the hydraulic tool, a main body section includes a cylinder and a piston. A head section is attached to the cylinder, includes a movable part. The piston is capable of rotating about the cylinder with the movable part. A control section is provided to the cylinder and includes oil paths and a switching valve. A piston valve reciprocally moves to control communication between a first and a second cylinder chambers. A concave is provided in a bottom face of the cylinder, escapes an end of the piston valve from a position at which the end of the piston valve contacts a bottom face, and shuts off the communication between the chambers. A projection is provided at a position different from the concave, makes the end of the piston valve contact the bottom face and allows the communication between the chambers.

Abstract: A hydraulic tool is operable in an open center (OC) and a closed center (CC) mode and includes a cylinder and a piston within the cylinder. The piston defines a drive chamber and a retract chamber. A valve spool selectively supplies and exhausts hydraulic fluid to and from the drive chamber and the retract chamber. An oil tube is coupled to the valve spool and extends through the piston and is in communication with the retract chamber. The oil tube includes at least one hole that can selectively communicate the drive chamber and the retract chamber. A selector sleeve is provided for switching between the OC and CC modes. In the OC mode when the tool is in the neutral mode, the valve spool is configured to supply the hydraulic fluid through the oil tube to the retract chamber such that movement of the piston can allow communication between the retract chamber and the drive chamber through the at least one hole in the oil tube.

Abstract: Governor valve device for a pressure fluid operated tool having a ball valve (23, 24), the valve ball (24) of which is provided in a cavity (25), open towards the seal ring (23) of the valve, in a movable piston (26). A spring-loaded member (30) urges the valve ball against the seal ring. By movement of the piston, the ball can be moved out of and into, respectively, a sealing position against the seal ring in order to permit and to prevent, respectively, the passage of pressure fluid to a drive chamber (17) in the tool.

Abstract: An assembly for reversing a fluid driven motor. The assembly includes a fluid driven motor, and a reversing valve that reverses inlet and exhaust porting to and from the fluid driven motor. An actuation device opens an actuation valve and a fluid supply valve. The actuation valve causes the reversing valve to reverse the inlet and exhaust porting to and from the fluid driven motor when the actuation device opens the actuation valve. The fluid supply valve allows fluid to flow through the fluid supply valve to the motor when the actuation device opens the fluid supply valve. The fluid supply valve also prevents fluid flow through the fluid supply valve to the fluid driven motor when the fluid supply valve is closed.

Abstract: A load balancing arm is shown and described as having improved control including a programmable control element and electronic air regulation to provide precise and controllable lifting force on a load. The disclosed load balancing arm responds to slight operator applied force to aid in movement of the load in overcoming system hysteresis, friction and load inertia without requiring the operator to apply a sufficiently large magnitude force to overcome such counteracting forces in the system. The disclosed load balancing arm further includes automatic load weight detection sensors for accommodating variation in load weights while applying a lifting force to the load which substantially equals the weight of the load. This allows the operator to move the load freely throughout a work space.

Abstract: A multi-piston assembly is illustrated wherein a cylindrical housing (A) is ported through longitudinal circumferentially spaced ports (F) and (G) carried within the cylindrical housing. Porting through piston rods is thus avoided so that their cross section may be reduced thereby increasing the area of the pistons available for contact by pressurized fluid. Even greater force may be made available for actuating a tool by the addition of an add-on unit utilizing complementary longitudinal porting.

Abstract: A controller for a hydraulic motor (11) comprises a directional valve (12) for communicating hydraulic pressure fluid from a pressure source (10) to the motor (11), a pilot pressure operated activating device (13, 14), pilot valves (17, 18) connected to the activating device (13, 14) and to the pressure source (10), and a manually operable activating lever (15) mechanically connected to the directional valve (12) via a coupling (24, 55, 56). A pressure fluid operated actuator (25, 47, 48) is associated with the coupling (24, 55, 56) to shift the coupling when pressurized from an engaged condition and a disengaged condition, and a mode shifting valve (19) is connected both to the actuator (25, 47, 48) and to the pilot valves (17, 18) and is arranged to pressurize simultaneously the pilot valves (17, 18) and the actuator (25, 47, 48) of the coupling (24, 55, 56) to avoid double activation of the directional valve (12).

Abstract: A hydraulic control apparatus for use with a hydraulically operated tool comprises a valve body operatively and having a valve bore defining an axis. The valve body also defines a pressure port and a return port for connecting the valve bore to a source of hydraulic fluid, and a cross port communicating between the valve bore and the hydraulic tool. A tubular conduit has one end in communication with the valve bore and an opposite end in communication with the hydraulic tool. A selector member is moveable between a first position for defining a passage communicating between the cross port and the opposite end of the tubular conduit to provide a return path for hydraulic fluid between the pressure port and the return port, and a second position for closing off this passage.

Abstract: A pressurized fluid actuation system as provided for a surgical instrument. The system includes a double-acting fluid pressure actuator with an extension chamber and a retraction chamber separated by a piston for engaging a component of the instrument. An operating lever is pivotally mounted to the piston. The operating lever is also pivotally connected to a servo valve that has a valve spool. The valve is connected to a source of pressurized fluid and has first and second return ports for venting the fluid. The actuator extension and retraction chambers are connected with the valve for each communicating with the pressurized fluid source and with one of the return ports in response to the position of the valve spool. The system includes a feedback line communicating between the extension chamber and the valve to apply a force to the valve spool in one direction when the extension chamber is pressurized.

Abstract: A safety throttle is provided for a hand held pneumatic tool in which a pivotable intermediate member must be manually moved, by a prior secondary movement, into a slotted throttle lever before the later primary movement of the throttle lever will allow the intermediate member to activate a throttle valve to actuate the pneumatic tool.

Abstract: A hydraulic cylinder has a piston in it with a rod projecting out of the cylinder and connectable with a tool which is operable by movement of the piston rod. A high pressure space is defined in the cylinder at one side of the piston and a low pressure space is defined at the other side of the piston. A partition defines the other end of the low pressure space. A diaphragm on the other side of the partition defines an equalizing space between the diaphragm and the partition. A low pressure line is in communication with the low pressure space and with the equalizing space. A change over valve in the lines to both the high pressure space and the low pressure space enables connection of high pressure from a pump either to one space or to the other space in the cylinder while always permitting communication from the low pressure line to the equalizing space, the connection to the equalizing space is in the low pressure line between the change over valve and a non-return valve at the pump.

Abstract: A longitudinally controllable adjustment device comprises a cylindrical housing, in which a piston rod with a piston is slidable and sealingly extending outwards. Furthermore it comprises a valve for controlling length adjustment of the device. In order to avoid a destruction of seals preventing a flow to the outside of pressure medium at least two seals are provided between the housing and the piston rod whereby a seal between the outer end of the housing and a further seal prevents an inflow of gas and in particular of liquid from the outside into the housing.

Abstract: A tilting table for machining works is of the worm and worm wheel type incorporating a hydraulic servomechanism. A displacement of a stylus operating lever effected by the drive worm shaft moves the servocontrol valve out of its neutral position, thereby causing a tilting motion of the table in a desired direction via a hydraulic power unit of the mechanism. Due to a linkage connection between the table and the lever, the movement of the table always follows the lever so as to compensate the initial displacement, resulting in light and accurate positioning of the inclined table.

Abstract: A fluid control valve is provided for use in conjunction with a fluid device and a source of fluid pressure wherein the fluid device includes an expansible fluid chamber which, upon connection to the fluid pressure source, actuates the fluid device while exhaustion of the fluid pressure from the expansible chamber deactuates the fluid device. The fluid control valve, according to the present invention, comprises a valve member and a housing axially slidably disposed over the valve member. The housing further includes a first fluid port adapted for connection with the fluid pressure source, a second fluid port adapted for connection with the expansible chamber of the fluid device and a third fluid port adapted for connection with a source of low fluid pressure. Resilient means are provided within the housing to retain the housing in a central or neutral position relative to the valve member.