US3415159A - Fluid-operated extendable and contractable arrangement - Google Patents

Fluid-operated extendable and contractable arrangement Download PDF

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Publication number
US3415159A
US3415159A US508008A US50800865A US3415159A US 3415159 A US3415159 A US 3415159A US 508008 A US508008 A US 508008A US 50800865 A US50800865 A US 50800865A US 3415159 A US3415159 A US 3415159A
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Prior art keywords
chamber
cylinder
piston
arrangement
liquid chamber
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US508008A
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English (en)
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Hornlein Reinhard
Tacke Otto
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REINHARD HORNLEIN KG
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REINHARD HORNLEIN KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B9/00—Tables with tops of variable height
    • A47B9/10—Tables with tops of variable height with vertically-acting fluid cylinder
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • F15B11/076—Combined pneumatic-hydraulic systems with pneumatic drive or displacement and speed control or stopping by hydraulic braking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • F15B2211/41536—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve being connected to multiple ports of an output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/885—Control specific to the type of fluid, e.g. specific to magnetorheological fluid
    • F15B2211/8855—Compressible fluids, e.g. specific to pneumatics
    • 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
    • Y10S60/00—Power plants
    • Y10S60/907—Working member positioned against counterforce by constantly applied motive fluid

Definitions

  • ABSTRACT OF THE DISCLOSURE A fluid-operated extendable and contractable arrangement in which a movable partition divides cylinder means into a gas chamber means filled with compressed gas and a liquid chamber means filled with liquid in which an elongated displacement member extends into the liquid chamber means and project fluid-tightly sealed through and beyond one end of the cylinder means while a second partition is located between the displacement member and the movable partition and dividing the liquid chamber into a first liquid chamber and a second liquid chamber placed by passage means in communication with each other, which passage means may be opened and closed by control means so that when the passage means are closed, the arrangement will be locked in any position it had been brought to while the passage means were open.
  • the present invention relates to a fluid-operated extendable and contractable arrangement especially suited for height adjustable tables or the like and which includes a cylinder and an elongated displacement member extending into the cylinder and beyond one end thereof. adjustable in longitudinal direction with respect to the cylinder and arrestable in any adjusted position relative thereto.
  • the arrangement according to the present invention may be used also for adjusting the position of any two members relative to each other which are respectively connected to one end of the cylinder and to the end of the displacement member projecting beyond the other end of the cylinder.
  • the fluid-operated arrangement mainly comprises cylinder means having opposite closed ends, movable partition means dividing the cylinder means into a gas chamber means and a liquid chamber means, wherein the volume of the gas chamber means increases and that of the liquid chamber means decreases when the movable partition means move in a first direction and vice versa when the movable partition means move in the second direction opposite to the first direction.
  • a compressed gas fills the gas chamber means and an elongated displacement member extends into the liquid chamber member and has an inner end spaced from the movable partition means and an opposite end portion projecting fluidtightly sealed through and beyond one end of the cylinder means.
  • a liquid fills the space in the liquid chamber means about the displacement member and this liquid is in pressure transmitting contact with the movable partition means.
  • the displacement member is movable in inward direction upon application of a predetermined pressure on the outer end portion thereof so as to contract the arrangement and so as to displace liquid in the liquid chamber means, forcing thereby the movable partition means to move in the second direction to thereby compress the gas in the gas chamber means to an increasing extent, and upon reduction of the predetermined pressure on the opposite end portion of the displacement member, the increasingly compressed gas will act on the movable partition means to move the latter in the first direction reducing thereby the volume of the liquid chamber means and forcing the displacement member in outward direc tion so as to expand the arrangement.
  • the arrangement includes further second partition means between the inner end of the displacement member and the movable partition means and dividing the liquid chamber means into a first liquid chamber bordering on the movable partition means and a second liquid chamber into which the displacement member extends, passage means providing communication between the first and the second liquid chamber, and control means cooperating with the passage means for opening and closing the latter, whereby when the passage means are closed, the liquid trapped in the first and the second liquid chamber will prevent movement of the displacement member in inward direction and movement of said movable partition means in the first direction so that the arrangement will be locked in any position as it has been brought to while said passage means were open.
  • FIG. 1 is a longitudinal cross section through a first embodiment of an arrangement according to the present invention
  • FIG. 1a is a longitudinal cross section through a partially illustrated modification of the arrangement shown in FIG. 1;
  • FIG. 2 is a longitudinal cross section through a second embodiment of an arrangement according to the present invention.
  • FIG. 3 is a partial longitudinal cross section through a further modification
  • FIGS. 4 and 5 are longitudinal cross sections through additional modifications according to the present invention.
  • FIG. 6 is a transverse cross section taken along the line VIVI of FIG. 5
  • FIG. 7 is a longitudinal cross section through an additional modification
  • FIGS. 8 and 9 are partial longitudinal cross sections through additional modifications of arrangements accordin g to the present invention.
  • FIG. 1 the arrangement illustrated in this figure mainly comprises elongated cylinder means shown in FIG. 1 as a single elongated cylinder 1 of substantially uniform diameter.
  • a movable partition means in the form of a floating piston 7, is located in the interior of the cylinder 1 and an O-ring 8 located in an annular groove of the floating piston 7 provides a fluidtight seal between the piston 7 and the inner surface of the cylinder 1.
  • the piston 7 forming the movable partition means divides the interior of the cylinder 1 into a gas chamber means 2 located between the piston 7 and the upper end of the cylinder 1 closed by the transverse wall and a liquid chamber means 3, 4.
  • a compressed gas fills the gas chamber 2.
  • An elongated displacement member in the form of a piston rod 11 extends fluid-tightly sealed through and beyond the bottom end of the cylinder 1.
  • a piston is fixedly connected to the inner end of the piston rod 11 and the piston is formed with an axial bore 22 therethrough located laterally of the axis of the piston.
  • a liquid L fills the space in the liquid chamber means 3, 4 about the displacement member 11 and the piston 10 fixed thereto.
  • the arrangement shown in FIG. 1 includes further second partition means in the form of a plate 9 extending transversely through and fixed to the cylinder 1 in any convenient manner.
  • the plate 9 is located between the floating piston 7 and the piston 10 fixed to the inner end of the piston rod 11, thus dividing the liquid chamber means into a first liquid chamber 3 bordering the movable partition 7 and a second liquid chamber 4 into which the displacement member or piston rod 11 extends.
  • Passage means provide communication between the first liquid chamber 3 and the second liquid chamber 4 and these assage means comprise at least one pair of bores 12 and 13 through the wall of the cylinder 1 spaced in axial direction of the cylinder from each other and respectively located at opposite sides of the plate 9 forming the second partition means.
  • Control means are provided for controlling flow of liquid through the bores 12 and 13.
  • the control means including an elongated sleeve 15 surrounding the cylinder 1 and a pair of annular fluid-tight seals in the form of O-rings 16 and 18 located in inner grooves at opposite ends of the sleeve 15 and a third annular seal in the form of an O-ring 17 spaced from the upper O-ring 16 a distance greater than the axial distance between the bores 12 and 13 and spaced from the lower O-ring 18 a distance smaller than t-hea forementioned axial distance, and the inner surface of the sleeve 15 is spaced between the sealing rings 16 and 17 from the outer surface of the cylinder so as to form an annular passage 14 therebetween.
  • the sleeve 15 is shown in FIG.
  • the coil spring 24 engages with the lower end thereof a stop 20 fixed to the outer surface of the cylinder and this stop has an upwardly extending annular portion 19 which engages the lower end of the sleeve 15 when the latter is displaced to its lower end position.
  • An additional stop 23 fixed to the outer surface of the cylinder 1 limits upward movement of the sleeve 15 under the force of the coil spring 24.
  • An operating member in the form of an elongated rod 21 is connected to the sleeve 15 for moving the latter between the end positions thereof.
  • a threaded stud 6 is preferably provided projecting centrally from the plate 5 closing the upper end of the cylinder and, if the above described arrangement is used for adjusting the height of a table this central stud may for instance be connected to the table plate, whereas the lower end of the piston rod 11 projecting downwardly beyond the cylinder may be connected in any convenient manner to a cross member forming the base of the table.
  • the above described arrangement shown in FIG. 1 may also be connected at opposite ends thereof to any two members which have to be relatively moved with respect to each other and be locked in any adjusted position.
  • FIG. 1a shows in a partial sectional view, a slight modification of the arrangement illustrated in FIG. 1.
  • the arrangement partially shown in FIG. 1a differs from the arrangement above described in that the first partition means is constituted by an enclosure 7' formed of flexible material and located in the first fluid chamber 3 surrounded by the liquid therein.
  • the flexible enclosure 7' is filled with compressed gas and the interior of the flexible enclosure '7' constitutes therefore the gas chamber means 2'.
  • the arrangement is only partially illustrated in FIG. 1a and it is to be understood that the arrangement includes otherwise all components shown in FIG. 1 and described above.
  • FIG. 1a The arrangement illustrated in FIG. 1a will operate substantially as above described in connection with FIG. 1 the only difference being that during inward movement of cylinder 10 and piston rod 11 and displacement of liquid from the second liquid chamber 4 into the first liquid chamber 3 the flexible wall 7' of the first partition means will be partly collapsed and the gas located therein thereby compressed.
  • FIG. 2 shows a further arrangement according to the present invention.
  • the arrangement shown in FIG. 2 differs from the above described arrangement shown in FIG. 1 in that the cylinder means comprise an upper cylinder 25 and a lower cylinder 26 coaxially arranged with the upper cylinder 25 and having an upper end extending into the lower end of the upper cylinder.
  • the movable partition means in the arrangement shown in FIG. 2 is constituted by a ball 27 of elastic material located in the upper cylinder 25 and sealingly engaging the inner surface thereof.
  • the ball 27 forming the movable partition means divides the cylinder means 25, 26 into an upper gas chamber 2 and lower liquid chamber means 3, 4.
  • An elongated piston rod 37 carrying at the upper inner end thereof a piston formed with at least one bore therethrough extends with its lower end fluid-tightly sealed through and beyond the lower end of the cylinder 26.
  • the second partition means comprises in the arrangement of FIG. 2 a plate member 33 fixed to and extending transverse through the upper end of the lower cylinder 26 so as to divide the liquid chamber means into a first liquid chamber 3 above the plate 33 and a second liquid chamber 4 below the plate 33.
  • the passage means forming communication between the liquid chambers 3 and 4 are constituted in this embodiment by a central bore 34 through the plate 33.
  • the upper end of the cylinder 26 extending into the lower end of the cylinder 25 is provided with an outer screw thread 35 with which a corresponding inner screw thread of a cup-shaped member 29 is threadingly engaged.
  • the transverse end wall of the cup-shaped member 29 is formed with an opening 32 therethrough, whereas the peripheral wall 29 of the cupshaped member tightly engages with the outer surface thereof the inner surface of the cylinder 25 and the peripheral wall 29 is welded at the bottom end thereof fluidtightly to the bottom end of the cylinder 25.
  • a pair of annular seals 36 in the form of O-rings or the like are located in annular grooves at the inner surface of the peripheral wall 29 and these seals 36 provide a fluid-tight seal between the inner surface of the peripheral wall 29 of the cup-shaped member 28 and the outer surface of the cylinder 26.
  • a projection 30 Integnally connected to the transverse wall of the cup-shaped member 28 and projecting downwardly therefrom is a projection 30 having a substantially conical bottom end 31 engaging in the position shown in FIG. 2 into the bore 34 so as to close the latter.
  • the projection 30 forms therefore a control means for opening and closing the passage means 34 between the liquid chambers 3 and 4.
  • a handle 38 projects laterally from the upper end of the cylinder 25 fixed thereto for turning the upper cylinder 25 about its axis relative to the lower cylinder 26 which is held in any convenient manner in fixed nonrotatable position.
  • FIG. 2 will operate substantially in the same manner as the embodiment shown in FIG. 1, however opening and closing of the passage means of the bore 34 through the plate 33 will be provided in the arrangement illustrated in FIG. 2 by turning the upper cylinder 25 by means of the handle relative to the lower fixed cylinder 26. Due to the thread connection between the lower cylinder 26 and the cup-shaped member 28 fixed to the upper cylinder 25, such turning of the upper cylinder relative to the lower cylinder will cause axial shifting of the projection 30 in one or the other direction, depending on the direction of rotation of the upper cylinder, so that during such turning the passage 34 will be opened or closed. 1
  • FIG. 3 shows part of an arrangement similar to that shown in FIG. 2 and it is to be understood that the portions of the arrangement not shown in FIG. 3 are substantially identical to those shown in FIG. 2.
  • the arrangement illustrated in FIG. 3 differs from that shown in FIG. 2 only by the specific construction of the means for closing and opening the passage which provides communication between the upper liquid chamber 3 and the lower liquid chamber 4.
  • the lower cylinder 26 in which the lower liquid chamber 4 is provided is again formed at the upper end thereof with the screw thread with which the screw thread on a cup-shaped member 39 fixed to the lower end of the upper cylinder 25 engages.
  • the upper end of the lower cylinder 26 is again closed by a plate 41 which is formed with a bore 42 therethrough and the transverse wall portion of the cup-shaped member 39 which closes the lower end of the upper cylinder 25 is likewise formed with a bore 40 therethrough which is transversely displaced with regard to the bore 42 in the plate 41.
  • the transverse wall portion of the cup-shaped member 39 may be moved towards or away from the plate 41 which closes the lower cylinder 26 and when the bottom surface of the transverse wall portion of the cup-shaped member 39 engages the top surface of the plate 41 no liquid can pass between the liquid chambers 3 and 4, whereas when these surfaces are spaced from each other, liquid may pass through the bore 40, the space between the two surfaces, and the bore 42 between the two liquid chambers.
  • FIGS. 4-6 illustrate further modifications of the arrangement according to the present invention.
  • the cylinder means comprise a single elongated cylinder 43 divided by movable partition means in the form of a floating piston 7 in a gas chamber 2 and liquid chamber means 3, 4.
  • the liquid chamber means 3, 4 is divided by second partiition means in the form of a fixed plate 48 securely fastened to the cylinder wall by a corrugation 49 into a first liquid chamber 3 adjacent the floating piston 7 and a second liquid chamber 4.
  • the cylinder 43 is closed at opposite ends thereof by end caps 44 and 45, respectively, and the lower end cap 44 carries fixedly connected thereto a threaded stud 46 serving to connect the cylinder 43 at one end thereof to a member to be moved by the arrangement illustrated.
  • An elongated displacement member 47 in the form of a hollow piston rod is located in the liquid chamber 4 and projects with its upper end through and beyond the closure cap 45 fluidtightly sealed with respect thereto.
  • a handle 47 extends transversely from the upper end of the piston rod 47 for a purpose as will be described later on.
  • the upper end of the piston rod 47 may be connected in any convenient manner to the other member to be adjusted by the arrangement.
  • the passage means which provides communication between the liquid chamber 3 and the liquid chamber 4 is constituted in the arrangement shown in FIG. 4 by a bore 52 through the plate 48.
  • the control means for opening and closing the bore 52 comprise in the arrangement shown in FIG. 4 a bushing 51 provided with an outer screw thread and threadingly engaged in a correspondingly threaded central bore through the plate 49.
  • the bushing 51 carries at its lower end fixedly connected thereto a disk 50 which extends in radial direction beyond the bore 52 through the plate 48. The upper surface of this disk 50 engages the bottom face of the plate 49 and in the position as shown in FIG. 4 no liquid can pass between the liquid chambers 3 and 4.
  • the piston rod 47 carries fixedly connected thereto at the inner end thereof a piston 55 which is in sealing engagement with the inner surface of the cylinder 43 and which is formed with a bore 56 and a second bore 56' of smaller diameter than that of the bore 56 therethrough.
  • An elongated rod 53 of polygonal, for instance square, cross section is telescopically arranged in the interior of the hollow piston rod 47, and rod 53 extends through a central bore 54in the piston 55 having a cross section substantially identical to that of the rod 53.
  • the rod 53 is fixedly connected in any convenient manner at the bottom end thereof in the bushing 51.
  • the piston 55 fixedly connected thereto will likewise be turned and to take thereby the rod 53 along so that turning of the piston rod 47 will cause turning of the bushing 51 in one or the other direction depending on the direction of turning of the piston rod, so that the disk 50 may be brought in a position opening or closing the passage 52.
  • the piston rod 47 When the passage 52 is thus opened, the piston rod 47 may be pushed downwardly by application of pressure onto the upper end thereof and during such downward movement, in which the piston rod 47 moves to a greater extent into the liquid chamber 4, liquid therein will be displaced into the liquid chamber 3, moving thereby the floating piston 7 in downward direction and compressing the gas in the gas chamber 2. During such inward movement of the piston rod 47 and the piston 55 connected thereto liquid will pass also from the portion of the liquid chamber 4 beneath the piston to the portion thereof above the piston through the bores 56 and 56' through the piston. When the passage 52 is closed again, the piston rod 47 and the cylinder 3 will be held in locked position relative to each other.
  • FIGS. 5 and 6 differs from the above described arrangement shown in FIG. 4 by a slightly diflerent construction of the closure means for closing the passage 52 through the plate 48 and for closing the passage 64 through the piston 55.
  • the piston 55 as well as the plate 48 in the arrangement shown in FIG. 5 are bot-h formed with a threaded central bore therethrough and a valve member 59 having a threaded bushing portion and a disk portion integrally connected thereto is threadingly engaged in the threaded central bore through the piston 55 whereby the disk portion of the valve member 59 extends radially over the bore 64.
  • a corresponding valve member 58 is threadingly engaged with the threaded central bore through the plate 48 and the disk portion of the valve member 58 extends radially over the bore 52 through the plate 48.
  • a rod member 53 of polygonal, for instance square, cross section is telescopically arranged in the hollow piston rod 47 and the rod member 53 extends through a central bore of a cross section substantially identical to that of the rod in the valve member 59, whereas the lower end of the rod 53 extends into the valve member 58 and is fixedly connected thereto.
  • the disk portions of the valve members 58 and 59 are provided with a pair of circumferentially spaced projections 62 and 63, as best shown in FIG. 6, cooperating with a pin 60 or 61 respectively fixed to the plate 48 and the piston 55.
  • FIG. 7 shows a further modification of the arrangement according to the present invention.
  • the cylinder means shown in FIG. 7 comprise an outer cylinder 66 and an inner cylinder 65 coaxially arranged in the outer cylinder.
  • the outer cylinder 66 is closed at one end by an end cap 67 and at the other end thereof by an end cap 68.
  • the end cap 67 has a projecting portion 69 extending into one end of the inner cylinder 65 and closes the inner cylinder at this end.
  • a floating piston 71 is arranged in the annular space between the inner and the outer cylinder and sealing rings 72 and 73 are provided in this floating piston respec tively engaging the inner surface of the outer cylinder 66 and the outer surface of the inner cylinder 65 to form a perfect seal with these cylinder surfaces.
  • the floating piston 71 constitutes movable partition means dividing the cylinder means constituted by the inner and outer cylinders into a gas chamber 2 and a liquid chamber means 3, 4.
  • the gas chamber 2 is sealed at the end distance from the floating piston 71 by a gasket 70.
  • a second partition means divide the liquid chamber means into a first liquid chamber 3 adjacent the gas chamber 2 and a second liquid chamber 4.
  • the second partition means is constituted in the arrangement shown in FIG. 7 by a plate 76 fixed in a fluid-tight manner to the end of the inner cylinder 65 adjacent the end cap 68 of the outer cylinder. Plate 76 may also be integral with the end cap 68.
  • An elongated displacement member in the form of a piston rod 74 is located in the second liquid chamber 4 projecting with an end portion thereof fluid-tightly sealed through and beyond the end cap 67 to the outside of the outer cylinder 66.
  • the inner end of the piston rod 74 carries fixedly connected thereto a piston 75 slidingly guided in the inner cylinder 65 and formed with at lleast one bore therethrough.
  • the passage means providing communication between the liquid chamber 3 and the liquid chamber 4 are constituted in this arrangement by a central bore 77 through the plate 76 which communicates with a bore of enlarged diameter 80 and through a pair of transverse bores 81 with the liquid chamber 3.
  • a valve member 78 serves for opening and closing the aforementioned passage between the liquid chamber 3 and the liquid chamber 4.
  • the valve member 78 has a threaded portion 82 threadingly engaged in a threaded bore in the end cap 68 and an inner projection 79 of preferably conical configuration of the valve member is adapted to engage into the bore 77 to close the latter in the position as shown in FIG. 7.
  • the valve member 78 has at the outer end an enlarged diameter portion 83 which together with an enlarged bore 84 in the end cap 68 provides an annular chamber in which sealing rings 85 are located to properly seal the valve member 78.
  • a handle 86 connected to the outer end of the valve member 78 serves to turn the latter about its axis so that the valve member may be moved during turning thereof between a valve closing and a valve opening position. In the open position of the valve 78, the piston rod 74 and the cylinder means 65, 66 may be moved relative to each other in the manner as described before, whereas when the valve is closed the piston rod 74 will be held in locked position relative to the cylinder means.
  • FIGS. 8 and 9 show further embodiments of the arrangement according to the present invention.
  • the cylinder means are constituted by the cylinders 87 and 88 axially aligned with each other and the cylinder 87 has a larger diameter than the cylinder 88.
  • the cylinders are connected at adjacent ends thereof by the annular member 91.
  • Movable partition means in the form of a floating piston 7 divide the cylinder means into a gas chamber 2 filled with compressed gas and liquid chamber means 3, 4 filled with liquid, for instance oil.
  • the gas chamber 2 is closed by the end cap 89 fixed to the outer end of the large cylinder 87 and the end cap 89 fixedly carries a threaded stud 90 projecting outwardly therefrom which may serve to connect the arrangement at one end thereof to one of the components to be moved and be held in adjusted position by the arrangement.
  • An elongated displacement member in the form of a hollow piston rod 94 extends into the cylinder 88 and projects with one end thereof fluid-tightly sealed through and beyond the end cap at the right end of the cylinder 88, as viewed in FIG. 8.
  • the second partition means which divides the liquid chamber means into a first liquid chamber 3 adjacent the gas chamber 2 and a second liquid chamber 4 is constituted in the arrangement shown in FIG.
  • the passage means which provide communication between the liquid chambers 3 and 4 are constituted in this case by bores 93 extending through the piston 92.
  • the control means for opening and closing the passage means 93 comprise a disc 99 extending radially beyond the bores 93 through the piston.
  • a rod member 95 is provided which may have a circular cross section and which extends with a threaded portion 98 thereof through a correspondingly threaded central bore in the piston 92 and the rod member 95 is fixedly connected, for instance by a set screw, at the inner end thereof to the disc member 99.
  • the outer end of the rod 95 extends sealed by means of seals 96 through and beyond the outer end of the piston rod 94 and a handle or transverse bar 97 is connected to the outer end of the rod 95. Turning of the rod 95 by means of the handle 97 in one or the other direction will cause axial movement of the disc 99 towards or away from the piston 92 to thereby open or close the passages 93 therethrough.
  • the piston rod 94 and the piston 92 connected thereto may be moved relative to the cylinder means in the manner as described before, while when the passages 93 are closed, the piston rod and the cylinder means are locked with respect to each other in any adjusted position.
  • FIG. 9 differs from that described above in connection with FIG. 8 only by the specific construction for opening and closing the passages 108 through the piston 107 which is fixedly connected to the inner end of the hollow piston rod 101.
  • the piston 107 is provided with a central threaded bore in which a correspondingly threaded bushing 103 threadingly engages, which is integral with a disc portion 102 extending radially over the bores 108 through the piston.
  • a rod member 104 of polygonal, for instance square, cross section Telescopically arranged within the hollow piston rod 101 is a rod member 104 of polygonal, for instance square, cross section and this rod 104 extends through an opening in the bushing 103 having a cross section corresponding to that of the rod 104, whereas the inner end of the rod 104 is fixedly connected, for instance by welding, to a member 105 connecting adjacent ends of the cylinders 87 and 88 to each other.
  • the transverse portion of the member 85 is formed with the opening 106 therethrough.
  • a transverse lever or handle 100 is connected to the outer end of the piston rod 107 for turning the latter about its axis.
  • valve member 102, 103 When the piston rod 101 is turned about its axis while the valve member 102, 103 is prevented from rotation by the engagement with the fixed rod 104, the valve member and the piston 107 will be axially displaced with respect to each other so that, depending on the direction of rotation of the piston rod 102, the disc portion 102 of the valve member will be moved toward or 10 away from the piston 107 to open or close the passages 108 therethrough.
  • a fluid-operated extendable and contractable arrangement comprising, in combination, cylinder means having opposite closed ends; movable partition means dividing said cylinder means into a gas chamber means and a liquid chamber means, the volume of said gas chamber means increasing and that of said liquid chamber means decreasing when said movable partition means moves in a first direction, and vice versa when said movable partition means moves in a second direction opposite to said first direction; a compressed gas filling said gas chamber means; an elongated displacement member extending into said liquid chamber means and having an inner end in said cylinder means and an opposite end portion projecting fluid tightly sealed through and beyond one end of said cylinder means; means connected to said elongated dis placement member for preventing said inner end thereof to move beyond said one end of said cylinder means; a liquid filling the space in said liquid chamber means about said displacement member, said liquid being in pressure transmitting contact with said movable partition means, said displacement member being upon application of a predetermined pressure on said opposite end portion thereof movable in inward direction so as to contract said arrangement and so
  • said second partition means comprises a plate member fixed to and extending transversely through said cylinder means.
  • control means includes a sleeve surrounding said cylinder in the region of said bores spaced from the outer surface of said cylinder and having at opposite ends thereof a pair of fluid tight seals engaging the outer surface of said cylinder and a third fluid tight seal spaced from one of said pair of seals a distance greater and from the other a distance smaller than the axial distance between said bores, said sleeve being axially movable between a first end position in which said third seal is located between said bores closing thereby said passage means and a second end position in which said bores are located between said one seal and said third seal so that said passage means are open.
  • passage means includes one bore extending in axial direction through said plate member and wherein said control means includes a closure movable in axial direction and cooperating with said bore for opening and closing the latter.
  • said cylinder means includes a pair of cylinders axially aligned with each other and movable in axial direction relative to each other, and wherein said plate member is fixed to one of said cylinders and said closure member to the other of said cylinders.
  • said closure member comprises a second plate member fixed to the other of said cylinders and formed with an opening therethrough laterally spaced from said bore, said second plate member being movable in axial direction with said other cylinder between a closed position engaging said plate member fixed to said one cylinder and an open position spaced therefrom.
  • closure member includes a second plate member fixed to the other of said cylinders and formed with an opening therethrough transversely spaced from said bore and a conical projection fixed to said second plate member and movable with said other cylinder in and out of said bore.
  • said elongated displacement member is hollow and including a rod member telescopically arranged in said hollow displacement member and operatively connected to said closure member for moving the latter.
  • said means connected to said elongated displacement member comprises a piston fixed to said inner end of said elongated displacement member in sealing engagement with said cylinder means and being formed with a bore therethrough located laterally of the axis thereof.
  • said passage means includes one bore extending in axial direction through said plate member
  • said control means includes a closure member movable in axial direction and cooperating with said bore for opening and closing the latter
  • said elongated displacement member is hollow, and including a rod member telescopically arranged in said hollow displacement member and operatively connected to said closure member for moving the latter, and further including an additional closure member for closing said bore through said piston, and means coupling said closure members to each other.
  • each of said closure members includes a bushing threadingly engaged in a threaded central opening respectively provided in said plate member and said piston and each carrying at one end thereof integrally connected a disc extending over the respective bore, said rod member being connected at an inner end portion thereof projecting beyond said hollow displacement member to said bushings, and including stop means limiting turning of said bushings in opening and closing direction relative to said piston and said plate member.
  • said stop means including a pair of projections projecting angularly spaced from each other in a radial direction from each of said discs, and a pin member fixed to and projecting in axial direction from said plate member and said piston respectively, and cooperating with said projections.
  • said cylinder means comprises an outer cylinder and an inner cylinder coaxially arranged in said outer clyinder radially spaced therefrom, said movable partition means being formed by an annular piston located between and sealingly engaging said inner and said outer cylinder, and said displacement member extending into said inner cylinder through one end of said cylinder means.
  • passage means includes at least one transverse bore through said plate member communicating at the inner end thereof with said central bore.
  • said closure member comprising a threaded bushing threadingly engaged in said threaded opening and a disc coaxially fixed to said bushing and extending over said bore, said rod member being fixed at the inner end thereof to said cylinder means and said bushing being n-onrotatably connected to said rod member but slidably in longitudinal direction thereof.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Chairs Characterized By Structure (AREA)
  • Vehicle Body Suspensions (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Ropes Or Cables (AREA)
  • Actuator (AREA)
US508008A 1964-11-14 1965-11-16 Fluid-operated extendable and contractable arrangement Expired - Lifetime US3415159A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DEH54327A DE1301026B (de) 1964-11-14 1964-11-14 Hydropneumatisches Hebeaggregat, insbesondere fuer hoehenverstellbare Tische und Stuehle
DEH0054677 1964-12-23
DEH0055001 1965-01-28
DEH0055540 1965-03-23
DEH0055561 1965-03-24

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US3415159A true US3415159A (en) 1968-12-10

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US508008A Expired - Lifetime US3415159A (en) 1964-11-14 1965-11-16 Fluid-operated extendable and contractable arrangement

Country Status (9)

Country Link
US (1) US3415159A (de)
AT (1) AT277510B (de)
BE (1) BE672104A (de)
CH (1) CH433649A (de)
DE (5) DE1301026B (de)
FR (1) FR1453681A (de)
GB (1) GB1123030A (de)
NL (1) NL6514704A (de)
NO (1) NO136133C (de)

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US3531065A (en) * 1967-11-13 1970-09-29 Dowty Rotol Ltd Aircraft arresting device
US3563349A (en) * 1968-01-24 1971-02-16 Rudolf Spieth Blockable device for the stepless adjustment of flaps
US3779132A (en) * 1971-07-14 1973-12-18 T Otto Combination air and hydraulic motor
US3871527A (en) * 1973-04-04 1975-03-18 Westinghouse Electric Corp Ram tensioning device
US4091488A (en) * 1977-01-12 1978-05-30 Kelley Company Inc. Dockboard utilizing a gas spring for counterbalancing
DE3519479A1 (de) * 1985-05-31 1986-12-11 Miele & Cie GmbH & Co, 4830 Gütersloh Haushaltsgeraet mit verstellbaren geraetefuessen
US4830432A (en) * 1986-05-15 1989-05-16 Stabilus Gmbh Positioning device
US5115723A (en) * 1991-04-30 1992-05-26 John Wang Height adjusting device
US5285877A (en) * 1990-09-22 1994-02-15 Boge Aktiengesellschaft Impact damper
US6027185A (en) * 1997-12-18 2000-02-22 Caterpillar Inc. Recoil and slack adjustment mechanism for an endless track chain of an undercarriage assembly
US20060272497A1 (en) * 2005-05-12 2006-12-07 P. & M. Design & Consulting Ltd. Pneumatic cylinder
US20080289327A1 (en) * 2004-10-08 2008-11-27 Rolf Mintgen Linear Drive
CN104930015A (zh) * 2015-05-13 2015-09-23 中航飞机起落架有限责任公司 一种油气式可降载气动作动筒及其降载方法
CN105615287A (zh) * 2016-03-24 2016-06-01 贵州大学 一种脚踏式升降桌
CN107630861A (zh) * 2016-11-28 2018-01-26 陈干惠 一种可灵活调整的安全自锁油缸
CN110219856A (zh) * 2019-06-21 2019-09-10 宁波威曼智能科技有限公司 一种用于附锁气缸的气动锁
CN110307208A (zh) * 2019-07-12 2019-10-08 周鹏 一种密封多级液压缸
US10443594B2 (en) 2015-12-18 2019-10-15 Graco Minnesota Inc. Bellows anti-rotation construction
CN110630582A (zh) * 2019-09-10 2019-12-31 长沙理工大学 一种缸筒储能型液压缸
US10549803B2 (en) 2017-06-30 2020-02-04 Sram, Llc Seat post assembly
US10668968B2 (en) 2017-06-30 2020-06-02 Sram, Llc Seat post assembly
US10982665B2 (en) 2015-12-18 2021-04-20 Graco Minnesota Inc. Bellows pressure relief valve
WO2021239733A1 (de) * 2020-05-26 2021-12-02 H. Rottländer & A. Seuthe Gbr (Vertretungsberechtiger Gesellschafter Hendrik Rottländer, Langenberger Str. 463, 45277 Essen) Arretiersystem
US20220079332A1 (en) * 2020-09-14 2022-03-17 Kesseböhmer Holding Kg Gas spring system for a height adjustable table, height adjustable table and method for operating the gas spring system

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DE1812282C3 (de) * 1968-12-03 1981-07-30 Fritz Bauer + Söhne oHG, 8503 Altdorf Hubvorrichtung zum stufenlosen Höhenverstellen von Tischplatten, Stuhlsitzen u.dgl.
JPS4923879B1 (de) * 1970-07-31 1974-06-19
DE2948081A1 (de) * 1979-11-29 1981-06-04 Stabilus Gmbh, 5400 Koblenz Laengeneinstellbares federelement
DE3040483A1 (de) * 1980-10-28 1982-06-16 Stabilus Gmbh, 5400 Koblenz Gasfeder mit hydraulischer blockierung
JPS57127136A (en) * 1981-01-29 1982-08-07 Tokico Ltd Closed type cylinder device
HU186104B (en) * 1982-08-10 1985-06-28 Arpad Beres Energy storing frame suitable for moving equipments
DE3413781A1 (de) * 1984-04-12 1985-10-24 Hermann Dipl.-Ing. Bansbach (FH), 7073 Lorch Verstellbare stuetze
DE3446408C2 (de) * 1984-12-20 1989-06-29 Günther 7307 Aichwald Hahn Blockierbare Gasfeder
GB2172373A (en) * 1985-02-27 1986-09-17 Furniture Ind Res Ass Load lifting and support device
DE3522722A1 (de) * 1985-06-25 1987-01-08 Otto Guenther Hubvorrichtung zum stufenlosen verstellen von tischplatten, stuhlsitzen, rueckenlehnen von komfort-sesseln und dergleichen
SE464057B (sv) * 1986-09-08 1991-03-04 Bengt Petersson Anordning foer stegloes hoejdinstaellning av en stolsits
DE3902882A1 (de) * 1989-02-01 1990-08-02 Stabilus Gmbh Hydraulisch blockierbare gasfeder
DE3930372A1 (de) * 1989-09-12 1991-03-21 Stabilus Gmbh Hydropneumatisches verstellelement
US5913391A (en) * 1997-01-09 1999-06-22 Avm, Inc. Damper

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US2638075A (en) * 1948-03-06 1953-05-12 Mavor & Coulson Ltd Pneumatically controlled hydraulic prop
US2721446A (en) * 1952-03-17 1955-10-25 North American Aviation Inc Accumulator-reservoir device
US2861560A (en) * 1952-07-26 1958-11-25 Alinari Carlo Gun for underwater fishing
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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531065A (en) * 1967-11-13 1970-09-29 Dowty Rotol Ltd Aircraft arresting device
US3563349A (en) * 1968-01-24 1971-02-16 Rudolf Spieth Blockable device for the stepless adjustment of flaps
US3779132A (en) * 1971-07-14 1973-12-18 T Otto Combination air and hydraulic motor
US3871527A (en) * 1973-04-04 1975-03-18 Westinghouse Electric Corp Ram tensioning device
US4091488A (en) * 1977-01-12 1978-05-30 Kelley Company Inc. Dockboard utilizing a gas spring for counterbalancing
DE3519479A1 (de) * 1985-05-31 1986-12-11 Miele & Cie GmbH & Co, 4830 Gütersloh Haushaltsgeraet mit verstellbaren geraetefuessen
US4830432A (en) * 1986-05-15 1989-05-16 Stabilus Gmbh Positioning device
US5285877A (en) * 1990-09-22 1994-02-15 Boge Aktiengesellschaft Impact damper
US5115723A (en) * 1991-04-30 1992-05-26 John Wang Height adjusting device
US6027185A (en) * 1997-12-18 2000-02-22 Caterpillar Inc. Recoil and slack adjustment mechanism for an endless track chain of an undercarriage assembly
US20080289327A1 (en) * 2004-10-08 2008-11-27 Rolf Mintgen Linear Drive
US20060272497A1 (en) * 2005-05-12 2006-12-07 P. & M. Design & Consulting Ltd. Pneumatic cylinder
US7395749B2 (en) 2005-05-12 2008-07-08 Michael R Adams Pneumatic cylinder
CN104930015A (zh) * 2015-05-13 2015-09-23 中航飞机起落架有限责任公司 一种油气式可降载气动作动筒及其降载方法
US10982665B2 (en) 2015-12-18 2021-04-20 Graco Minnesota Inc. Bellows pressure relief valve
US11703047B2 (en) 2015-12-18 2023-07-18 Graco Minnesota Inc. Bellows pressure relief valve
US10443594B2 (en) 2015-12-18 2019-10-15 Graco Minnesota Inc. Bellows anti-rotation construction
CN105615287A (zh) * 2016-03-24 2016-06-01 贵州大学 一种脚踏式升降桌
CN107630861A (zh) * 2016-11-28 2018-01-26 陈干惠 一种可灵活调整的安全自锁油缸
CN107630861B (zh) * 2016-11-28 2024-02-27 陈干惠 一种可灵活调整的安全自锁油缸
US11987312B2 (en) 2017-06-30 2024-05-21 Sram, Llc Seat post assembly
US10668968B2 (en) 2017-06-30 2020-06-02 Sram, Llc Seat post assembly
US10549803B2 (en) 2017-06-30 2020-02-04 Sram, Llc Seat post assembly
US11845505B2 (en) 2017-06-30 2023-12-19 Sram, Llc Seat post assembly
CN110219856A (zh) * 2019-06-21 2019-09-10 宁波威曼智能科技有限公司 一种用于附锁气缸的气动锁
CN110219856B (zh) * 2019-06-21 2024-03-08 宁波威曼智能科技有限公司 一种用于附锁气缸的气动锁
CN110307208A (zh) * 2019-07-12 2019-10-08 周鹏 一种密封多级液压缸
CN110630582A (zh) * 2019-09-10 2019-12-31 长沙理工大学 一种缸筒储能型液压缸
CN116249845A (zh) * 2020-05-26 2023-06-09 亨德里克·洛特兰德和阿德里安·佐伊特合伙公司 锁定系统
WO2021239733A1 (de) * 2020-05-26 2021-12-02 H. Rottländer & A. Seuthe Gbr (Vertretungsberechtiger Gesellschafter Hendrik Rottländer, Langenberger Str. 463, 45277 Essen) Arretiersystem
US12129908B2 (en) 2020-05-26 2024-10-29 H. Rottländer & A. Seuthe GbR (vertretungsberechtiger Gesellschafter Hendrik Rottländer, Langenberger Locking system
US20220079332A1 (en) * 2020-09-14 2022-03-17 Kesseböhmer Holding Kg Gas spring system for a height adjustable table, height adjustable table and method for operating the gas spring system

Also Published As

Publication number Publication date
GB1123030A (en) 1968-08-07
NO136133C (no) 1977-07-27
DE1429576A1 (de) 1970-01-29
NO136133B (no) 1977-04-18
DE1554258A1 (de) 1969-05-22
FR1453681A (fr) 1966-09-23
NL6514704A (de) 1966-05-16
CH433649A (de) 1967-04-15
BE672104A (de) 1966-03-01
DE1554257A1 (de) 1970-03-05
DE1301026B (de) 1969-08-14
AT277510B (de) 1969-12-29
DE1554251A1 (de) 1970-03-05

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