Abstract: The present invention aims to improve the strength of the portion of the swing frame for attaching the swing motor apparatus while reducing cost. A bottom plate of a swing frame is divided into a center bottom plate segment to which the swing motor apparatus mounting portion is attached, a front bottom plate segment that is positioned to the front side of the center bottom plate segment and to which the center joint mounting portion is attached, and a rear bottom plate segment positioned to the rear side of the center bottom plate segment, wherein: the center, front, and rear bottom plate segments and are formed integrally by welding; and the plate thickness of the center bottom plate segment is thicker than the plate thickness of the front bottom plate segment and the rear bottom plate segment.

Abstract: A fluid operated rotary drive comprises a drive housing (2) and an output shaft (4) able to be caused to oscillate in relation to it and having a pivotal abutment arranged on it which cooperates with a counter abutment (34 and 35). The pivotal abutment is able to be positioned about the longitudinal axis (8) of the output shaft (4) in different abutment settings and is able to be clamped in a releasable manner respectively against a clamping face (56) on the housing by means of a clamping means (53).

Abstract: A pressurized-medium-driven apparatus including an actuator articulately mounted a line segment and a connecting element. The line segment and the connecting element are connected so as to be mutually pivotable with respect to each other around a swing axis. The connection is provided by a junction means between the line segment and the connecting element, wherewith the connecting element and or the line segment are rigid components, preferably a rigid tube or pipe. The junction means is a swiveling junction connection.

Abstract: A motor-driven hydraulic rotator assembly for use on articulated-boom excavating equipment, or the like, for rotating and actuating an operable attachment. The rotator assembly comprises concentric tubular oil distribution channels located within the load-bearing shaft and drive assembly. In a preferred embodiment, the motor comprises a hydraulic pressure relief valve to decrease a low pressure side of the motor.

Abstract: In accordance with the present invention a pneumatic or hydraulic rotating cylinder capable of very high speeds is embodied. It is constructed of light weight materials, minimizing the mass but is given the ability to run at high speed in spite of vibrating environments, supply line condensation, contaminants and various attitudinal mounting by the anti-seizure insert bearing inserted into the distributor and sleeving the rotating shaft.

Abstract: A rotor assembly for rotating and actuating a working implement, comprising a load-bearing shaft adapted to be mounted to a boom member displacing the rotor assembly. Actuation means are secured to the load-bearing shaft. A drive assembly is rotatably mounted about the load-bearing shaft and is coupled to the actuation means. The drive assembly is adapted to be connected to a working implement so as to transmit actuation from the actuation means to the working implement to drive the working implement about the load-bearing shaft. A collector assembly is rotatably mounted to the load-bearing shaft and is adapted to receive a pressure supply therefrom. The collector assembly is provided with connector means adapted to provide the working implement with the pressure supply.

Abstract: The invention relates to rotating machine element that contains a mechanism actuated by a fluid pressure. The aim of the invention is to allow for a supply of actuation fluid also during the rotation. To this end, a non-rotating control element (2) is mounted on two fluid bearings (3) on the machine element, said bearings being spaced apart in the axial direction and allowing flows of actuation fluid to flow from one element to the other. Feed lines (R, S) in the control element are provided with a series of radially inwards facing ports (13, 14) and reception channels (17, 18) in the machine element, a series of radially outward facing orifices (15, 16) being disposed in such a manner that in every relative position both elements for every individual flow of actuation fluid are disposed such that at least one port (13, 14) is aligned with one associated orifice (15, 16).

Abstract: A cylinder has a rotating member, a cap, a piston, a collar, two control valves and two check valves. The piston is moveably mounted between the rotating member and the cap. The piston has a flange dividing the inner space between the rotating member and the cap into two chambers. The control valves are attached to the rotating member, respectively communicate with the chambers and respectively communicate with two I/O channels in the collar. The check valves are attached to the rotating member, respectively communicate with the chambers and respectively communicate with the I/O channels in the collar. Accordingly, the thickness of the flange of the piston can be decreased so as to reduce the weight of the cylinder, and the torsion for rotating the cylinder and the load to the axle of the machine are also reduced.

Abstract: A rotary cylinder assembly for a machine tool is provided that includes a lock check system that locks the work piece to the machine tool chuck and prevents extension and retraction of the work piece in the event of loss of hydraulic or pneumatic pressure. The rotary cylinder assembly includes a shaft end cover coupled between a fluid shaft housing and a cylinder body. The shaft end cover houses the lock check system and includes a number of flow paths that provide for extension and retraction of a piston rod connector housed in the cylinder body in response to fluid pressure supplied from the fluid shaft housing. The shaft end cover and lock check system are configured to allow small diameter cylinder bodies to be coupled thereto while providing the safety and functional features associated with the lock check system.

Abstract: In a preferred embodiment, a fluid-operated cylinder to provide both linear and rotary motion to tooling, including: a cylindrical, rotatable member for attachment to rotatable means; a circular piston disposed in the cylindrical, rotatable member for back and forth axial motion in a cavity defined therein and rotatable by rotation of the cylindrical, rotatable member; a first port defined through the cylindrical rotatable member to introduce pressurized fluid into the cavity on a first side of the circular piston such as to cause the circular piston to move in a first direction; and a piston shaft fixedly attached to the circular piston and fixedly attachable to the tooling; whereby: when the rotatable member is rotated, rotary motion will be transmitted to the tooling by the piston shaft, and when the pressurized fluid is introduced into the cavity on the first side of the circular piston, the piston shaft will cause the tooling to move in the first direction

Abstract: The invention relates to a clamping cylinder for operating, for instance, a chuck by means of a pull pipe or pull rod installed preferably in a turning machine. The clamping cylinder has a cylinder casing (4) comprising a screwed-on cover plate (5), an axially displaceable piston (12) in the work chamber (11) of the cylinder casing (4) to produce the clamping force and a distributor (2) fixed onto one of the cylinder casing faces with ports and pressure lines for supplying and discharging a pressure oil to and from the work chamber of the piston. According to the invention, the cylinder casing (4), its lid (5) and the distributor casing are made of a light metal in order to reduce inertia moments and wear and to improve lubrication and heat dissipation. The walls of the locating bores for the piston (12) and/or its piston rods (13, 22) are hard coated. The piston and its two piston rods are made in a single piece from a tool steel and their respective contact surfaces are hard chrome coated.

Abstract: A rotary cylinder for controlling operations of a chuck to be used on a lathe or the like. The rotary cylinder comprises a housing, a cylinder unit, a distributor supporting the cylinder unit in bearings fitted therein, and a seizure detecting system including a detaining mechanism for restraining the distributor from rotation relative to the housing. The seizure detecting system detects seizure between the distributor and the cylinder unit and allows the distributor to rotate relative to the housing. The distributor is capable of being fixedly held on the housing without distorting the bearings supporting the cylinder unit and of being disconnected from the housing when seizure occurs between the distributor and the cylinder unit.

Abstract: A chuck actuator has a cylinder housing rotatable about a main axis and forming a chamber, a piston axially subdividing the chamber into a pair of compartments and axially displaceable in the chamber, and a stem centered on the axis, extending from the housing, and formed with a pair of passages each having one end opening into a respective one of the compartments and an opposite end opening on the stem offset from the piston. A distributor body is rotatable about the axis on the stem and has connections for feeding fluid under pressure into the opposite ends of the passages for axially displacing the piston in the chamber. The cylinder housing is formed with cooling openings directed at the distributor body.

Abstract: There is disclosed a workhead for timber processing, the workhead having a main body and a jaw assembly for grappling timber. The jaw assembly includes first and second cooperating pairs of jaw arms that are pivotally mounted to the main body. The first of the cooperating pairs of jaw arms provides cutting blades for delimbing. The workhead further includes a feed roller assembly for translating a felled tree through the cutting blades. First and second feed rollers of the feed roller assembly are associated with the jaw arms of the second cooperating pair of arms of the jaw assembly. A third feed roller is provided on the main body for pivotal movement relative to the main body. The feed rollers also effect compression debarking of the felled tree as it is translated through the cutting blades. Each roller has projecting engaging bars which extend in a generally helical configuration along the outer surface of the roller and between its opposed terminal ends.

Abstract: A power transmission has a high pressure fluid feed for supplying fluid pressure to the control chamber of a movable sheave. The high pressure fluid is supplied through a tube supported for relative rotation in a pair of spaced bushings. One bushing has radial passages for communicating the high pressure fluid from the tube to the chamber and axial passages on the outer periphery circumferentially spaced from the radial passages. The other bushing has uninterrupted inner and outer sealing surfaces. The space between the bushings receives leakage fluid escaping passed the outer surface of the tube and the inner surface of one bushing. This leakage fluid is redirected, at least partially, by the axial passages to a lubrication passage in the transmission.

Abstract: Rotational control apparatus (A) in the preferred forms of fan clutches is disclosed including shoulder bolts (78) extending through axially extending voids (146) formed in axially extending portion (66) and flange (76) of first and second shell housings (62, 68). The shoulder bolts (78) secure the shell housings (62, 68) together to prevent relative movement therebetween. The apparatus (A) further includes a piston (80) having tabs (144) extending from the outer periphery thereof into the voids (146) and including openings having bushings (134) therein for slideable receipt on the shoulder bolts (78). Springs (138) are mounted on standoffs (210) extending in the voids (146) and abutting with the shoulder of the shoulder bolts (78).

Abstract: A driving mechanism transforms continuous longitudinal reciprocation of a piston in a chamber into unidirectional rotation. The mechanism utilizes a closed wave-shaped groove defined in either the cylinder or the chamber and adapted to receive guiding members projecting from the other of the piston and the chamber. When the piston is forced to move longitudinally in either direction, the groove slides over the guiding members to force rotation. The apices of the wave-shaped groove are either contoured or provided with a gating structure to assure that the guide members do not backtrack but instead move in one direction through the groove.

Abstract: The device for transferring a pressure medium has a stationary outer component with first pressure medium channels and an inner, rotatably drivable component inside the stationary outer component radially spaced at a distance from the stationary outer component. The inner component has second pressure medium channels. The outer component is connected to the housing of a machine tool and the inner component is connected to the machine spindle. A first and a second intermediate member in the form of an annulus are provided. The first and second intermediate members are positioned fixedly in the space between the inner and the outer components for bridging the distance between them. The first intermediate member has at least one first connecting channel and the second intermediate member has at least one second connecting channel.

Abstract: A driving mechanism transforms continuous longitudinal reciprocation of a piston in a chamber into unidirectional rotation. The mechanism utilizes a closed wave-shaped groove defined in either the cylinder or the chamber and adapted to receive guiding members projecting from the other of the piston and the chamber. When the piston is forced to move longitudinally in either direction, the groove slides over the guiding members to force rotation. The apices of the wave-shaped groove are either contoured or provided with a gating structure to assure that the guide members do not backtrack but instead move in one direction through the groove.

Abstract: A chuck assembly for high speed operations is provided. The workpiece gripping and releasing functions of the chuck are carried out pneumatically by a nonrotating air tube assembly extending through a bore in a machine tool to which the rotating chuck is mounted. The chuck is mounted to a portion of a machine tool for rotation therewith and is rotatably disposed over an air journal rigidly mounted to the nonrotating air tube assembly. Selective direction of compressed air causes relative movement between a piston mounted in a cylindrical work chamber of a chuck body. Relative movement between the piston and chuck body causes movement of an actuator having a wedge which is engages a generally annular clamping assembly.

Abstract: A through hole rotating cylinder for controlling a workpiece gripping chuck associated with a rotary machine tool. The cylinder includes a cylinder body assembly, piston tube and fluid distributor section rotatable within a housing and defining a central axial opening. Bearings supported between the housing and cylinder body assembly are lubricated by flow from a hydraulic system used to move the piston tube in the cylinder body assembly. A coolant collector receives coolant liquid travelling through the central axial opening. A seal assembly between the coolant collector and the bearings prevents coolant from contaminating the hydraulic fluid in the hydraulic system.

Abstract: A power actuator has a hollow cylinder housing generally centered on an axis, a piston axially displaceable but non-rotatable in the housing and defining therein a pair of axially opposite pressurizable compartments, and a piston stem centered on the axis, fixed to the piston, extending axially from the piston, and formed with a pair of separate feed passages each having one end opening into a respective compartment and an opposite end opening axially on the stem. A distributor body rotatable about the axis on the stem at the opposite ends of the passages but axially nondisplaceable on the stem is provided with respective connections communicating with the opposite ends. Thus the compartments can be pressurized via the respective passages and connections for axial movement of the piston and stem in the housing. A pair of axially spaced guides are fixed on the distributor body and a bearing has a race axially rotatable on the housing about the axis but axially nondisplaceable on the housing.

Abstract: A rotator for crane-mounted working implements comprises a housing (7) swingably connectible with the tip of the crane via a joint, and a pivot shaft (8) connectible with the working implement and pivotal relative to said housing by means of at least one vane or flap (10) operating in a chamber and dividing said chamber into two operating chambers which can be supplied with, or evacuated of, hydraulic medium via two first ducts (12) provided in said housing, said pivot shaft including second hydraulic medium through-ducts (17, 17') opening into annular hollow spaces (16, 16') in a swivel connection (15) incorporated in said housing.

Abstract: A pneumatic type of reciprocating movement device capable of a high cycle speed over a short stroke. A rod member with a flange is slidably mounted in a cylinder member such that the flange divides a cavity in the cylinder into a left and right portion. Intake and exhaust passages are moved in and out of communication with the cavity sides by the moving interface of the rod and cylinder, such that an alternating force is exerted on the flange sides causing the flange and rod member to move in a reciprocating motion without the use of an auxiliary system of valve switching.

Abstract: The chuck or collet actuating apparatus for a machine tool comprises a rotating clamping cylinder, an axially slidable clamping piston rotating with the clamping cylinder and a coaxial cylindrical projecting portion in the clamping cylinder. The projecting portion carries a thread, on which a threaded ring is guided and engaged. This threaded ring is provided with a coaxial undercut annular groove in an opposing surface facing the clamping cylinder and is securable against rotation on the projecting portion. A plurality of stop pins are provided which are axially unshiftable relative to the threaded ring and which engage and slide in the annular groove. The stop pins project through an opposing wall of the clamping cylinder into an interior space of the cylinder axially slidable and sealing axially. These stop pins form a stop for the clamping piston limiting its displacement.

Abstract: The debarking machine of the instant invention includes a frame having a stationary central hub, a ring rotatably mounted on the frame for rotation about the hub having air-pressure-actuated tools carried on the ring. Power means are provided for rotating the ring. Air passage means extend from the central hub to the ring for supply actuating air to the tools. Air passage means includes a rotary-air-seal coupling, which comprises a substantially U-shaped channel formed of a pair of opposed L-shaped annular structures which extend about the hub and have a first air plenum carried therein. A pair of annular, floating seals are disposed on the interior side walls of the U-shaped channel and a rotary disc, having a second air plenum therein, is mounted on the ring and received in the U-shaped channel, in rotatable contact with the air seals.

Abstract: A kelly cock valve for a drill rig uses a sliding gate to open and close the flow passage through the drill string. The valve has a body with a longitudinal passage through it. The gate is mounted in the body perpendicular to the flow passage. Pushrods extend from each end of the gate out through bonnets mounted to the body of the valve. The fluid cylinders are mounted on each side of the gate. Each fluid cylinder has a piston with a piston rod extending in opposite directions. The piston rods are connected to a beam that also connects to the pushrod. Hydraulic passages supply fluid to the cylinders to stroke the piston and thus move the gate valve between open and closed positions.

Abstract: A chuck actuator has a cylinder extending along an axis and having an axially extending stem whose outer surface is formed with a pair of central radially outwardly open and axially spaced intake ports, a piston axially displaceable in the cylinder and forming therein two compartments connected via respective passages connected to the intake ports, two axially spaced bearings on the stem, and a connector supported by the bearings on the stem. This connector normally is restrained against rotation relative to the axis and has an inner surface closely juxtaposed with and forming with the stem surface an interface. Respective radially inwardly open and axially spaced inner feed grooves open at the interface level with the respective intake ports. Two independent hydraulic fittings communicating with the inner feed grooves can pass pressurized liquid to the respective compartments.

Abstract: A pressure actuated hydraulic seal ring is disclosed for sealing to a rotating cylindrical member. The seal ring clears the rotating member when no hydraulic fluid is applied to its outer diameter. When hydraulic pressure is introduced to its outer diameter, a net compressive force is applied to the seal ring causing it to collapse in radially. The rotating cylindrical member includes a port through an external cylindrical surface which communicates with a conduit in the wall of the cylindrical member. The seal ring includes two inner sealing surfaces which straddle the port in the cylindrical surface where the ring is non-rotatingly supported by a ring retainer disposed about the exterior of the cylindrical surface. A passage extends from the outer diameter of the seal ring to a channel between the two inner sealing surfaces.

Abstract: A power cylinder for operating a chuck for a machine tool has a rotary cylinder casing, a pair of check valves for confining a pressure fluid in an operating chamber, accumulators for absorbing impacts of the pressure fluid, and detecting means for detecting the fluid pressure in the operating chamber. The power cylinder can be rotated in a state wherein the feeding and discharging of the pressure fluid is stopped.

Abstract: A rotary hydraulic cylinder for actuating a rotary work holder, on a machine tool. A non-rotary fluid distributor is supported on the cylinder by a bearing sleeve. The bearing surface of the sleeve has an anti-friction coating. The sleeve is rotatable within a housing and is frictionally restrained from rotation under normal operating conditions by O-rings, but can rotate in the event of bearing seizure. Sleeve rotation is sensed through a proximity switch to stop operation of the machine tool.

Abstract: Means are provided to introduce pressurized fluid from a source into an intermittently rotated machine tool such as a chuck while the tool is stationary. The means includes a stationary annular shell surrounding a portion of the tool and radially spaced a short distance from the surface of the tool. The inside of the shell has a channel which seats an annular flexible U-shaped seal the radially outer ends of the legs of which are rigidly secured to the shell. The inner face of the seal is a web having a relatively stiff center band which, under fluid pressure is forced to shift into contact with the surface of the tool to form a seal on each side of a groove in the tool's surface. A restricted opening permits fluid from the inside of the seal to be introduced into the groove to supply the tool.

Abstract: On an intermediate shaft connected to a propeller shaft there are supported a stationary housing and a distributor or separator ring structure limiting two annular passages in the housing which can be selectively impinged with pressurized oil. The annular passages are connected to two oppositely effective working spaces of a servo motor of the adjustable pitch propeller by control passages extending through the intermediate shaft and the propeller shaft. The separator or distributor ring structure comprises axial sections, each of which is formed of one part in circumferential direction and is fixedly connected in axial direction to an axial section thereof associated with the same annular passage by web or bridging members bendable in radial direction. Each axial section is sealingly guided in a cylindrical bore of the housing by a respective sealing ledge protruding from the outer circumferential face thereof.

Abstract: A distributor is disclosed wherein a stator receives highly-pressurized fluid from a stationary source and delivers the same to spaced-apart annular reservoirs in a rotor. Bores in the rotor conduct the fluid to a rotating piston and cylinder assembly. Bearings support the rotor so that an annular orifice is formed by a gap between hardened face surfaces on the stator and rotor. The spacing between the annular reservoirs is greater than the distance to an adjacent drain reservoir. The drain reservoirs deliver fluid to the bearings for lubrication before the fluid is returned to the stationary source.

Abstract: In a power operated chuck, a radially elastically deformable seal ring is inserted in a recess of a pressure fluid supply ring embracing the chuck body. The seal ring comprises a stiff body portion in which passages are provided for the pressure fluid, and laterally projecting fins which are elastically deformable in the radial direction of the chuck and apply against the supply ring. In an unloaded state, the seal ring is under slight bias applied against the supply ring and spaced from the circumferential surface of the chuck body. The area of the outer circumferential surface of the seal ring, exposed to the inflowing pressure fluid, is larger than the ring area on the inside circumference which is exposed to fluid pressure from the inside. The design makes it possible to transfer, in a short period of time, a large amount of pressure fluid into the chuck. Also, the seal ring disengages from the chuck body abruptly.

Abstract: This invention relates to a cooling mechanism of a rotary hydraulic cylinder for chucking operation of machine tools. In a rotary hydraulic cylinder which consist of a rotor member having a reciprocable piston inside and in which working oil is fed to the piston in said rotor member, many fins are mounted, parallel to the movements of said piston rod, on the outer periphery of said working oil supplying member, and a cylinder-like cover whose side facing to said rotor member is folded inside to make a flange, is mounted at the edge, of said fins, facing said rotor, so that it may partially enclose the outer peripheral surface of said rotor member. The side of the rotor member enclosed by said cylinder-like cover, of said oil supplying member is provided with a rotary fan which rotates together with said roller member, thereby causing an air inlet opening of a fixed clearance between said cover and the rotary fan to be formed.

Abstract: A chuck actuator has a cylinder extending along a main axis and a piston axially displaceable in the cylinder, forming therein two compartments, and having an axially backwardly extending stem also centered on the axis and formed with two respective intake passages each having one end opening into the respective compartment and another end opening at a respective location on the stem. A connector rotatable about the axis on the stem is provided with respective fittings communicating with the locations. First and second axially spaced bearings prevent the connector from moving axially on the stem. Fluid is fed under pressure alternately to the fittings to pressurize and depressurize the respective compartments and thereby axially displace the piston in the cylinder. Normally the cylinder is connected to a chuck body and the piston to a chuck-actuating member for fluid actuation of the member.

Abstract: A kelly valving apparatus for controlling flow of fluid through a kelly and drill string comprises a rotatable tubular section having a fluid conveying bore adapted to be attached to the drill string at the kelly with a valve associated valve body valving the flow of fluids through the bore. A remotely operable operator is rotatable with the rotatable tubular section, operably engaging the valve for moving the valve between positions which open and close the bore, the operator including at least one hydraulic cylinder having an extensible ram actuated by hydraulic fluid, and linkage is connected to the valve and the hydraulic cylinder so that extension/contraction of the ram effects an opening or closure of the bore. A liquid interface fluid collector ring is positioned adjacent the rotatable tubular section for transmitting pressurized hydraulic fluid to the hydraulic cylinder, even during spinning of the cylinder with the tubular section.

Abstract: This invention relates to a floating manifold capable of transferring hydraulic fluid between a stationary member and a rotatable member. The floating manifold is comprised of a collar axially aligned onto a portion of the rotatable member, a passage means extending radially into the collar for the passage of a hydraulic fluid, and attachment means mounted on the outer periphery of said collar for permitting limited axial and rotational movement of the collar relative to the stationary member.

Abstract: An annular reservoir is defined by two mutually rotatable annular housing portions having suitable seals and friction reducing members that the housing portions can maintain fluid pressure within the reservoir despite relative rotation between them. Each housing portion is suitably ported for fluid transmission between the reservoir and an external point, such that one member may be connected to an external supply of fluid under pressure and to pressure controls, and the other member may be connected to a fluid powered mechanism such as an hydraulic cylinder, adaptable to perform a mechanical function such as closing or opening a valve. One housing portion may be channel shaped and the other may be receivable within the channel. A side of the channel shaped housing portion is removable to permit assembly and disassembly of the actuator.

Abstract: A power-chuck actuator has an actuator body forming an axially throughgoing passage and formed centered on this axis with an annular piston displaceable axially forwardly and backwardly and having a collar projecting from the front of the actuator. This collar can be connected to the actuating element of a power chuck whose chuck body can be bolted to the front end of the actuator body. In addition the actuator body has a backwardly extending sleeve on which is carried a connector body that is normally held against rotation and that is provided with hydraulic connections for pressurizing the compartments axially flanking the piston to operate the actuator. The actuator body is provided with a fan aligned with axially throughgoing passages of the connector body so that as the two bodies rotate relative to each other air is sucked through these passages by the fan to cool the actuator.

Abstract: Journalled in a peripheral groove in an operationally turning chuck body is a non-turning fluid coupling ring of which opposite side faces confront opposite side walls of the groove. Leading from annular ports in the groove walls are fluid passages which extend to chuck-closing and chuck-opening ends of a cylinder in the chuck body, and provided in the ring are fluid supply passages which lead to the opposite ring faces where they are in line with the ports in the confronting groove walls. The coupling ring has some lateral play in the body groove and acts as a shuttle valve in being operationally backed with either face into sealing engagement with the confronting groove wall by the pressure of operating fluid admitted to the port in the groove wall confronting the opposite ring face.

Abstract: The present invention relates to a rotary hydraulic jack device. This jack device comprises a rotary hydraulic joint whose rotary part is formed by a tubular extension of a first end cover of the jack cylinder. Two check valves and the rotary joint are respectively inserted in two main pipes which alternately connect the two compartments of the jack cylinder to a source of pressurized hydraulic fluid and to a tank at atmospheric pressure. Each check valve is controlled by an auxiliary pipe connected to one of the main pipes upstream of the other check valve. The two check valves are respectively located in tight chambers arranged in the first end cover of the jack cylinder. This jack device may be used to control the part of clamping chuck of a machine tool.

Abstract: A fluid supply distributor communicates fluid from a stationary fluid source to a rotating hydraulic motor. The distributor includes a housing with main ports for connection to high and low pressure at the source. A shaft rotating in the housing is attached to the motor and includes motor ports for connection to the rotating motor. A sleeve in the housing surrounds the shaft, and the sleeve and shaft define interfacing sealing surfaces. The housing, the sleeve, and the shaft include passages for communicating fluid between the main ports and the motor ports. The sleeve is normally retained in a stationary position, but is released to rotate within the housing should the shaft seize within the housing. The passages include spaced supply grooves at the sealing surfaces connected to the main ports and thus maintained at different pressures.

Abstract: A hydraulic drive mechanism for a chucking device on a workpiece spindle on a gear hobbing machine. A chucking piston is movable back-and-forth in the chucking cylinder and rotates with the workpiece spindle. Pressure medium is fed through a nonrotating supply member, for example, a connecting sleeve. The chucking cylinder is secured to the face plate so that the cylinder end plate which seals off the connecting piece forms a planar surface with the surface of the face plate. Pressure medium is supplied to the chucking cylinder through flexible hoses.

Abstract: A fluid supply distributor communicates fluid from a stationary fluid source to a rotating hydraulic motor. The distributor includes a housing with main ports for connection to high and low pressure at the source. A shaft rotating in the housing is attached to the motor and includes motor ports for connection to the rotating motor. A sleeve in the housing surrounds the shaft, and the sleeve and shaft define interfacing sealing surfaces. The housing, the sleeve, and the shaft include passages for communicating fluid between the main ports and the motor ports. The sleeve is normally retained in a stationary position, but is released to rotate within the housing should the shaft seize within the housing. The passages include spaced supply grooves at the sealing surfaces connected to the main ports and thus maintained at different pressures.

Abstract: A rotary hydraulic jack having two jack compartments, comprising a rotary hydraulic joint for the supply of hydraulic liquid to and the evacuation of hydraulic liquid from at least one of the compartments. The hydraulic joint comprises a fixed, hollow cylindrical part and a rotary part supported by bearings with a narrow annular gap between itself and the fixed part. A passageway leads to said compartment and has a portion in each of the fixed and rotary parts, the passageway portion in the rotary part being equipped with at least one non-return device for hydraulic liquid supplied to said compartment. A groove is provided in at least one of the fixed and rotary parts and communicates with the passageway portions in the fixed and rotary parts. Means is provided for supplying gas under pressure to the annular gap betwen the fixed and rotary parts for the purpose of expelling residual oil from the gap after the supply of hydraulic liquid under pressure to said compartment via the passageway has been completed.

Abstract: A double-acting rotary hydraulic jack having two jack compartments, comprising a rotary hydraulic joint for the supply of hydraulic liquid to and the evacuation of hydraulic liquid from the compartments. The two compartments of the jack each communicate with at least one axial boring in a rotary part of the jack which is not axially movable. In this boring a movable piston bears against the head of a guide rod for a spring which itself bears against the rotary part of the jack. The ends of the rods, externally of the borings, are secured to a member coaxial with the jack, for example a sleeve, whose axial position is monitored by a displacement detector, so as to give an indication of the working pressure in the active jack compartment.