US3855902A - Cylinder piston unit for a power operated revolving chuck - Google Patents

Cylinder piston unit for a power operated revolving chuck Download PDF

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Publication number
US3855902A
US3855902A US00337126A US33712673A US3855902A US 3855902 A US3855902 A US 3855902A US 00337126 A US00337126 A US 00337126A US 33712673 A US33712673 A US 33712673A US 3855902 A US3855902 A US 3855902A
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United States
Prior art keywords
piston
piston rod
cylinder
fluid
hollow interior
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Expired - Lifetime
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US00337126A
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English (en)
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R Kirst
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Hofmann & Co Kg dt
Hofmann & Co KG W
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Hofmann & Co KG W
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
    • B23B31/302—Hydraulic equipment, e.g. pistons, valves, rotary joints
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S251/00—Valves and valve actuation
    • Y10S251/90—Valves with o-rings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/12—Chucks or sockets with fluid-pressure actuator
    • Y10T279/1208—Chucks or sockets with fluid-pressure actuator with measuring, indicating or control means

Definitions

  • the invention relates to a pressurized fluid actuated rotating cylinder piston unit for power operated chucks, in particular, for lathes, milling machines, grinding machines and the like in which the tool or the blank is held in a jaw chuck.
  • check valves are provided to prevent-pressure drop in the actually pressurized cylinder chamber in case of the pressure supply being shut down unintentionally, due to a pressure tube defect or another leakage.
  • the respective chamber is to be vented, i.e., the respective check valve must be disabled, or rendered out of function.
  • German published patent specification German Offenlegungsschrift, published Oct. 7, 1971, No. 2 011 996 shows certain aspects of such a unit.
  • German Patent Specification 1 006 236 granted Oct. 10, 1957 discloses a cylinder piston unit for similar purposes and is likewise provided with a radially movable actuating piston.
  • the check valves are of the plug type with an extension engaged by the piston.
  • the non-symmetrical disposition of the piston is a serious drawback because it may, under the effect of centrifugal forces, unintentionally render the safety device out of service.
  • a further drawback is the complex shape of the valves. V
  • German utility model DT-GM 1 985 828 registered May 22, 1968 discloses a cylinder unit in which one of the valves is a disc valve while the other is a flap valve. ln this design which is apparently quite expensive, an individual actuating piston is provided for each valve.
  • This unit nevertheless, has the technical advantage that all moving parts are disposed symmetrically with respect to the unit-axis; however, it is not possible to provide a hollow machine spindle extending through the unit and serving as blank supply channel for the check, as is often desired for lathes.
  • SUMMARY OF THE INVENTION lt is the object of the invention to provide a pressurized fluid actuated cylinder piston unit for power operated chucks and the like in which the advantages of the known units are maintained while their drawbacks are avoided.
  • the check valves should have the form of simple O-rings, flat rings, quad rings or the like because these require but a minimum of space within the cylinder.
  • the actuating means are to be simple, small, and should be insensitive against centrifugal forces.
  • the unit should permit hollow spindles to extend therethrough.
  • a cylinder piston unit in which the fluid (preferably pressurized air) is supplied to the cylinder chambers bilaterally of the piston via channels extending axially through the piston rod and communicating each with one of the chambers via series of bores extending radially through the piston rod, each series being disposed at one side of the piston.
  • the bores open into a circumferential groove in which an O-ring or other radially resilient ring is disposed. In case of the pressure within the channel drops unintentionally, the ring closes the bores and prevents rapid pressure drop within the respective cylinder. In case of the pressure being intentionally decreased or switched off, the other channel will be subjected to pressure.
  • the actuating means comprises plungers slidingly received within some, but not all of the bores and pushed outwardly by a slider or auxiliary piston moved under the pressure which is supplied to the opposite chamber.
  • FIG. 1 an axial section view of a cylinderpiston unit according to the invention.
  • FIG. 2 is a detail section, partly broken away, and taken at line 22 in FIG. 1.
  • a piston rod 18 carrying a piston 20 is axially movable and sealed against the cylinder by sealing rings 12, 14 and 16.
  • the piston 20 separates the cylinder chambers 22 and 24.
  • the piston rod 18 has an elongate hollow interior 18.1, and a central sleeve or tube 26 extends from the rod end remote from the cylinder (lefthand in FIG. 1)
  • the interior or duct 29 of sleeve or tube 26 communicates, via axial bore '30 of the piston rod anda radial aperture 32 thereof with a first supply opening 34 of a supply sleeve 36 and also communicates with one end 18.1a of the hollow interior 18.1 of the rod. Opening 34, aperture 32, bore 30 and the interior 29 of sleeve 26 define a first fluid medium channel.
  • a second channel leads from a second supply opening 38 of supply sleeve 36 to asecond radial aperture 40 of piston rod 18 to the annular duct or passage 42 remaining between the outer circumference of sleeve 26 and inner wall of bore 30, and then to the other end 18.1b of the hollow interior 18.1 of the piston rod.
  • supply sleeve 36 will be fixed while the assembly consisting in the piston rod with piston and cylinder may revolve relative thereto. Therefore, in the interior of supply sleeve 36 circumferential grooves are provided into which the apertures 32 and 40 open, the grooves assuring permanent communication between the supply openings and the aligned apertures. It is a matter of it will be understood that openings 34 and 38 are each connected to one output of a fluid main valve (not shown) by which either opening 34 or 38 is connected to a source of pressurized air while simultaneously the other opening is vented to the atmosphere. In case of a hydraulic cylinder, the other opening would be connected to a fluid tank.
  • an auxiliary piston or actuating slider 44 is slidably received between sleeve 26 and bore 30 about at the axial position of the piston 20.
  • the slider is sealed at its interior and its exterior and has the shape of a double cone with a central cylindrical portion.
  • circumferential grooves 45 are machined in piston rod 18, and from the bottom of the grooves, bores 46 extend radially inwardly and open into axial bore 30 (see FIG. 2, too).
  • An O-ring 48 is disposed in each of the circumferential grooves.
  • nine radial bores 46 are provided for each grooves and the nine bores consist of three groups of three bores each, the groups being equally angularly spaced.
  • a plunger 50 is slidably received, the outer end of each plunger abutting the inwardly facing side of the O-ring while the inner plunger and engages the conical surface of slider 44. It will be seen that each of the resiltion, such as to the right in FIG. 1, one set of the plungers 50 is urged radially outwardly as depicted in FIG.
  • chamber 24 is under pressure while chamber 22 is vented and that the pressure supply be reversed.
  • supply opening 34 will be vented and opening 38 connected to the source of pressurized air.
  • the sealing ring 48 for chamber 24 is urged into the circumferential groove and prevents, at first, venting of cylinder chamber 24 as it is expected to do.
  • pressurized air will flow in passage 42 and into chamber 22 lifting its O-ring 48 out of groove 45, and due to the pressure differential across slider 44 the latter will move in a direction toward chamber 24 and to the right in FIG.
  • FIG. 1 substantially to the position illustrated so that its conical surface urges the right hand plungers 50 outwardly toward chamber 24 for lifting sealing ring 48 in a camlike action.
  • FIG. 2 shows the deformation of the O-ring under the action of the plungers 50. It will be seen that the empty bores 46 adjacent each plunger are opened between passage 29 and chamber 24.
  • the check valve formed by the O-ring asthe valve member and groove 45 plus empty bores 46 asthe valve seal has been actuated to vent the respective cylinder chamber 24.
  • the pressure connections at ducts 34 and 38' may be reversed again so as to pressurize the duct 34 and vent the duct 38.
  • Application of pressure at duct 34 causes pressure to be applied in the passage 29 and through the bores 46 and against the inside of the O-ring 48 which is disposed in the chamber .24, with the effect that the pressurized air urges the O- ring 48 outwardly to allow the air under pressure to be applied into chamber 24.
  • the pressurized air from passage 29 is applied against the righthand end of slider 44, tending to move the slider to the left.
  • passage 42 is also vented and the air in passage 42 provides no resistance to the leftward movement of slider 44, and, accordingly, the slider 44 moves to the left until the slider is again stopped by the plungers 50.
  • the plungers 50 associated with the O-ring 48 of chamber 24, are urged radially inwardly toward tube 26 so as to release the corresponding O-ring 48 and allow it to seat in the groove 45 of chamber 24 whenever a sufficient buildup of pressure in the chamber 24 stops the flowof air into this chamber.
  • the plungers 50 associated withchamber 22 and the corresponding 0- ring 48 are urged radially outwardly by theconical the power chuck and specifically the jaw actuating member thereof.
  • spheres or similar bodies may deformable resilient rings such as flat rings, quad rings or sealing rings of other section shape.
  • deformable resilient rings such as flat rings, quad rings or sealing rings of other section shape.
  • slider 44 The sliding motion of slider 44 is limited by a shoulder 52 bilaterally provided of the cylindrical central portion of the slider, the shoulders serving as a stop means upon engagement at the plungers.
  • Other stop means may be provided, and this will be compulsory if the plungers are replaced by spheres.
  • the centrifugal force acting upon the sealing rings will be negligible, and this will normally be assumed for the plungers, too.
  • the plungers may be replaced by link systems in which thecentrifugal force is counterbalanced; such systems are known to experts skilled in the art.
  • a hollow spindle may readily be disposed within the sleeve 26 extending through the entire length of the cylinder unit, and this is a very desirable feature as mentioned above. In such a design, the walls and diametersof the piston rod would have to be adapted.
  • the piston in the cylinder and dividing the cylinder into a pair of fluid chambers, and the piston having a rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having an elongate hollow interior with opposite ends adjacent the opposite sides of the piston,
  • fluid supply means attachable to such alternately pressurized and vented fluid connections and includingradial bores in the piston rod at opposite sides of the piston to direct pressurized fluid to the chambers and to vent the chamberslalternately for controlling the piston movement in the cylinder and includingcheck valves'for each cylinder chamher to be opened and closed responsive to pressure reversal in the fluid supply means, said check valves comprising a pair of valve elements respectively disposed at opposite sides of the piston and on the piston rod and in obstructing relation with said radial bores to prevent release of fluid pressure in the chambers, said fluid supply means including duct means in the hollow piston rod defining and separating fluid channels from each other, said channels respectively communicating with opposite ends of the hollow interior of the piston rod to alternately vent and pressurize the ends of the hollow interior andbores,
  • operating means responsive to pressure reversal at such fluid supply connections to selectively lift the valve elements out of obstructing relation with the bores to alternately vent the chambers and including radially movable actuating members in the bores at both sides of the piston and acting on the valve elements to lift the valve elements out of obstructing relation and said actuating members also protruding into the hollow interior of, the piston rod, and an auxiliary fluid pressure-operated piston slidable in the hollow interior of the piston rod and sealably isolating said opposite ends of the hollow interior from each other, said auxiliary piston being exposed to different fluid pressures at opposite ends of the hollow interior of the piston rod and being moved endwise in the piston rod by the fluid pressure differentials, and said auxiliary piston being provided with cam faces engaging said actuating members for radially moving the actuating members in the bores.
  • a pressurized air actuated cylinder piston unit comprising in combination: a hollow cylinder having a cylinder head at each end, a piston movable relative to I said cylinder and mounted on a piston rod extending through both cylinder heads, means'sealing said piston and piston rod against said cylinder, said piston rod having a-first and a second axially extending channel,
  • a sleeve being sealingly mounted about the piston rod v V end remote from said cylinder and provided withfirst and second axially spaced radial openings to be alternatively connected to a pressurized air source, each opening communicating with an internal circumferential groove within said sleeve, the first opening being via the respective groove and a radial aperture in the piston rod in communication with the first axially extending channel thereof and the second opening being via its groove and a radial aperture in the'piston rod in communication with the second axially extending channel thereof, saidsleeve and the assembly consisting of piston rod, piston, and cylinder being rotatable with respect to each other, a first set of radial passages extending from the first of said piston rod channels into a first cylinder chamber confined by the cyl'inder, the
  • asecond set of radial passages extending from said second-piston rod channel into a second chamber confined by the cylinder, piston, and piston rod separated from the first chamber by the piston, radially resilient ring means surrounding the pis-- ton rod at the positionof said first and second sets of radial passages closing the respective passages to prevent pressure drop within the respective chamber, and actuating means to radially expand the ring means and to render communicating the respective chamber and channel in response to pressure increase in the respective other channel, said actuating means including radially movable plungers in said radial passages to lift the resilient ring means out of obstructing relation with the passages to release pressure in said cylinder chambers, said actuating means also including a slidable operator movable along the piston rod and having oblique cam surfaces engaging the plungers in said first and second set of radial passages for alternately opening said first and second passages as the operator is moved endwise of the piston rod, and means
  • a revolving pressurized fluid actuated operator for a chuck comprising:
  • a cylinder to confine pressurized fluid
  • the piston having a fluid supply means includingradial bores in the-piston rod to direct pressurized fluid to the chambers and to vent the chambers alternately for controlling the piston movement in the cylinder and including check valves for each cylinder chamber to be opened and closed responsive to pressure reversal in the fluid supply means, said check valves comprising a pair of deformable rings respectively disposed at opposite sides of the piston and on the piston rod and in obstructing relation with said radial bores
  • said fluid supply means including a sleeve in the hollow piston rod and defining and separating fluid channels from each other, an actuation member movably mounted in one of said bores to lift the check valve ring and provide venting of the respective cylinder chamber, and an auxiliary piston being slidably mounted on said sleeve and being provided with cam faces engaging said actuating member for radially
  • a fluid actuatedoperator as claimed in claim 3 wherein a plurality of said actuation members are movably mounted in bores at both sides of the piston to lift the deformable check valve rings for venting alternate chambers, and said auxiliary piston having tapered ends engaging said actuation members and alternately urge said actuation members outwardly.
  • a revolving pressurized fluid actuated operator for a chuck comprising:
  • said piston rod also having a plurality of radial bores extending between said hollow interior and the exterior of the piston rod, said bores being disposed in at least two locations along the length of the piston rod adjacent each of said chambers so that certain of said bores provide communication between the hollow interior and one of the chambers, and the remaining bores provide communication between the hollow interior and the other of the chambers; releasable valve means at the exterior of said piston rod and obstructing said radial bores, and including a plurality of plungers extending inwardly through said bores and protruding into said hollow interior, said valve means being biased into boreobstructing position and being operable in response to outward movement of said plungers'to open the'valve means and release pressure from the chamber;
  • a fluid pressure operated slider in said hollow interior of the piston rod which defines the slideway for the slider, said slider traversing the hollow interior and sealing around the interior periphery of the slideway to obstruct fluid communication longitudinally along the hollow interior of the piston rod, said slider having oblique camming surfaces bearing outwardly against said plungers to restrain inward movement of-the plungers and produce radial outsaid piston rod having a pair of separate fluid passages each communicating with a respective end of the hollow interior of said piston rod to facilitate control of the fluid pressure applied to said bores and to the corresponding sides of the slider for simultaneously pressurizing one of the cylinder chambers and venting the other chamber as the fluid pressure moves the slider to operate the plungers and valve means.
  • a revolving pressurized fluid actuated operator for a chuck comprising:
  • a piston in the cylinder and dividing the cylinder into a pair of fluid chambers and the piston having a piston rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having a hollow interior adjacent the piston defining a combined fluid'passage and guideway, said piston rod also having a plurality of radial bores extending between said hollow interior and the exterior of the piston rod, said bores being disposed in at least two locations along the length of the piston rod adjacent each of said'chambers so that certain of said bores provide communication between the hollow interior and one of .the chambers, and the remaining bores provide communication between the hollow interior and the other of the chambers; 1
  • valve means at the exterior of said piston rod and obstructing said radial bores, and including a plurality-0f plungers extending inwardly through said bores and protruding into said hollow interior, said valve means being biased into boreobstructing position and being operable in response to outward movement of said plungers to open the valve means and release pressure from the chamber;
  • a plunger-operating slider in said hollow interior of the piston rod which: defines the slideway for the slider, said slider traversing the hollow interior and sealing around the interior periphery of the slideway to obstruct fluid communication longitudinally along the hollow interior of the piston rod, said slider having oblique camming surfaces bearing outwardly against said plungers to restrain inward movement of the plungers and produce radial outward movement of the plungers as the slider moves longitudinally along the piston rod for operating said valve means; and
  • said piston rod having a pair of separate fluid passages each communicating with a respective end of the hollow interior of said piston rod to facilitate control of the fluid pressure applied to said bores and to the corresponding sides of the slider for simultaneously pressurizing one of the cylinder chambers and venting the other chamber as the slider operates the plungers and valve means, wherein said piston rod includes a stationary tube extending longitudinally through said hollow inte rior andbeing connected to one of said fluid passages, and said slider being annular and having an interior periphery mounted upon and sliding along the exterior of said tube.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Actuator (AREA)
US00337126A 1972-11-21 1973-03-01 Cylinder piston unit for a power operated revolving chuck Expired - Lifetime US3855902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2256933A DE2256933C3 (de) 1972-11-21 1972-11-21 Druckmittelbetätigter umlaufender Spannzylinder für Spanneinrichtungen

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US3855902A true US3855902A (en) 1974-12-24

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DE (1) DE2256933C3 (enrdf_load_stackoverflow)
FR (1) FR2207248B3 (enrdf_load_stackoverflow)
IT (1) IT980833B (enrdf_load_stackoverflow)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209031A (en) * 1978-02-01 1980-06-24 General Signal Corporation Positive control valve assembly
US4249451A (en) * 1977-04-07 1981-02-10 La Precision Industrielle Rotary hydraulic jack device
US4332186A (en) * 1979-11-21 1982-06-01 Roehm Guenter H Hydraulic actuator for lathe chuck
US5876041A (en) * 1995-10-20 1999-03-02 Berg & Co. Gmbh Chuck drive system, especially for a rotating clamping device of a machine tool
US20040025683A1 (en) * 2000-03-23 2004-02-12 Erwin Bohler Rotation-independent actuation of a machine element
US7658196B2 (en) 2005-02-24 2010-02-09 Ethicon Endo-Surgery, Inc. System and method for determining implanted device orientation
US7775215B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. System and method for determining implanted device positioning and obtaining pressure data
US7775966B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. Non-invasive pressure measurement in a fluid adjustable restrictive device
US7844342B2 (en) 2008-02-07 2010-11-30 Ethicon Endo-Surgery, Inc. Powering implantable restriction systems using light
US7927270B2 (en) 2005-02-24 2011-04-19 Ethicon Endo-Surgery, Inc. External mechanical pressure sensor for gastric band pressure measurements
US8016745B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. Monitoring of a food intake restriction device
US8016744B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. External pressure-based gastric band adjustment system and method
US8034065B2 (en) 2008-02-26 2011-10-11 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8057492B2 (en) 2008-02-12 2011-11-15 Ethicon Endo-Surgery, Inc. Automatically adjusting band system with MEMS pump
US8066629B2 (en) 2005-02-24 2011-11-29 Ethicon Endo-Surgery, Inc. Apparatus for adjustment and sensing of gastric band pressure
US8100870B2 (en) 2007-12-14 2012-01-24 Ethicon Endo-Surgery, Inc. Adjustable height gastric restriction devices and methods
US8114345B2 (en) 2008-02-08 2012-02-14 Ethicon Endo-Surgery, Inc. System and method of sterilizing an implantable medical device
US8142452B2 (en) 2007-12-27 2012-03-27 Ethicon Endo-Surgery, Inc. Controlling pressure in adjustable restriction devices
US8152710B2 (en) 2006-04-06 2012-04-10 Ethicon Endo-Surgery, Inc. Physiological parameter analysis for an implantable restriction device and a data logger
US8187163B2 (en) 2007-12-10 2012-05-29 Ethicon Endo-Surgery, Inc. Methods for implanting a gastric restriction device
US8187162B2 (en) 2008-03-06 2012-05-29 Ethicon Endo-Surgery, Inc. Reorientation port
US8192350B2 (en) 2008-01-28 2012-06-05 Ethicon Endo-Surgery, Inc. Methods and devices for measuring impedance in a gastric restriction system
US8221439B2 (en) 2008-02-07 2012-07-17 Ethicon Endo-Surgery, Inc. Powering implantable restriction systems using kinetic motion
US8233995B2 (en) 2008-03-06 2012-07-31 Ethicon Endo-Surgery, Inc. System and method of aligning an implantable antenna
US8337389B2 (en) 2008-01-28 2012-12-25 Ethicon Endo-Surgery, Inc. Methods and devices for diagnosing performance of a gastric restriction system
US8377079B2 (en) 2007-12-27 2013-02-19 Ethicon Endo-Surgery, Inc. Constant force mechanisms for regulating restriction devices
US8591532B2 (en) 2008-02-12 2013-11-26 Ethicon Endo-Sugery, Inc. Automatically adjusting band system
US8591395B2 (en) 2008-01-28 2013-11-26 Ethicon Endo-Surgery, Inc. Gastric restriction device data handling devices and methods
US8870742B2 (en) 2006-04-06 2014-10-28 Ethicon Endo-Surgery, Inc. GUI for an implantable restriction device and a data logger
CN105673614A (zh) * 2016-02-25 2016-06-15 南京诚友数控设备有限公司 旋转接头

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE3049099A1 (de) * 1980-12-24 1982-07-15 SMW Schneider & Weißhaupt GmbH, 7996 Meckenbeuren Entsperrbares rueckschlagventil

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DE1006236B (de) * 1956-04-06 1957-04-11 Forkardt Paul Kg Umlaufender Pressluftzylinder fuer Spanneinrichtungen an Werkzeugmaschinen
US3120788A (en) * 1959-07-07 1964-02-11 Leduc Rene Double-acting fluid-pressure jack
US3130645A (en) * 1961-05-29 1964-04-28 Woodworth Co N A Slip ring
US3596567A (en) * 1969-08-12 1971-08-03 Milton L Benjamin Fail-safe valve assembly for power chuck motors and the like
US3599535A (en) * 1969-04-11 1971-08-17 Roehm Gmbh Rotary chucking cylinder for machine tool
US3618690A (en) * 1969-05-20 1971-11-09 Caterpillar Tractor Co Damping and air-purging means for relief valve
US3698434A (en) * 1971-04-01 1972-10-17 Int Harvester Co Hydraulic directional control valve

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Publication number Priority date Publication date Assignee Title
DE1006236B (de) * 1956-04-06 1957-04-11 Forkardt Paul Kg Umlaufender Pressluftzylinder fuer Spanneinrichtungen an Werkzeugmaschinen
US3120788A (en) * 1959-07-07 1964-02-11 Leduc Rene Double-acting fluid-pressure jack
US3130645A (en) * 1961-05-29 1964-04-28 Woodworth Co N A Slip ring
US3599535A (en) * 1969-04-11 1971-08-17 Roehm Gmbh Rotary chucking cylinder for machine tool
US3618690A (en) * 1969-05-20 1971-11-09 Caterpillar Tractor Co Damping and air-purging means for relief valve
US3596567A (en) * 1969-08-12 1971-08-03 Milton L Benjamin Fail-safe valve assembly for power chuck motors and the like
US3698434A (en) * 1971-04-01 1972-10-17 Int Harvester Co Hydraulic directional control valve

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249451A (en) * 1977-04-07 1981-02-10 La Precision Industrielle Rotary hydraulic jack device
US4209031A (en) * 1978-02-01 1980-06-24 General Signal Corporation Positive control valve assembly
US4332186A (en) * 1979-11-21 1982-06-01 Roehm Guenter H Hydraulic actuator for lathe chuck
US5876041A (en) * 1995-10-20 1999-03-02 Berg & Co. Gmbh Chuck drive system, especially for a rotating clamping device of a machine tool
US20040025683A1 (en) * 2000-03-23 2004-02-12 Erwin Bohler Rotation-independent actuation of a machine element
US6913268B2 (en) * 2000-03-23 2005-07-05 Forkardt Schweiz Ag Rotation-independent actuation of a machine element
US8016744B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. External pressure-based gastric band adjustment system and method
US8066629B2 (en) 2005-02-24 2011-11-29 Ethicon Endo-Surgery, Inc. Apparatus for adjustment and sensing of gastric band pressure
US7775966B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. Non-invasive pressure measurement in a fluid adjustable restrictive device
US7775215B2 (en) 2005-02-24 2010-08-17 Ethicon Endo-Surgery, Inc. System and method for determining implanted device positioning and obtaining pressure data
US7927270B2 (en) 2005-02-24 2011-04-19 Ethicon Endo-Surgery, Inc. External mechanical pressure sensor for gastric band pressure measurements
US8016745B2 (en) 2005-02-24 2011-09-13 Ethicon Endo-Surgery, Inc. Monitoring of a food intake restriction device
US7658196B2 (en) 2005-02-24 2010-02-09 Ethicon Endo-Surgery, Inc. System and method for determining implanted device orientation
US8870742B2 (en) 2006-04-06 2014-10-28 Ethicon Endo-Surgery, Inc. GUI for an implantable restriction device and a data logger
US8152710B2 (en) 2006-04-06 2012-04-10 Ethicon Endo-Surgery, Inc. Physiological parameter analysis for an implantable restriction device and a data logger
US8187163B2 (en) 2007-12-10 2012-05-29 Ethicon Endo-Surgery, Inc. Methods for implanting a gastric restriction device
US8100870B2 (en) 2007-12-14 2012-01-24 Ethicon Endo-Surgery, Inc. Adjustable height gastric restriction devices and methods
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Also Published As

Publication number Publication date
IT980833B (it) 1974-10-10
DE2256933B2 (de) 1974-09-05
FR2207248B3 (enrdf_load_stackoverflow) 1976-07-23
DE2256933A1 (de) 1974-06-06
FR2207248A1 (enrdf_load_stackoverflow) 1974-06-14
DE2256933C3 (de) 1975-05-07

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