US3677141A - Device in fluid-containing cylinders having a fluid-operated piston - Google Patents

Device in fluid-containing cylinders having a fluid-operated piston Download PDF

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Publication number
US3677141A
US3677141A US87910A US3677141DA US3677141A US 3677141 A US3677141 A US 3677141A US 87910 A US87910 A US 87910A US 3677141D A US3677141D A US 3677141DA US 3677141 A US3677141 A US 3677141A
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US
United States
Prior art keywords
sealing ring
fluid
bore
piston
buffer device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US87910A
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English (en)
Inventor
Roger Lagerqvist
Stig Stenlund
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MONSUN TISON AB
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MONSUN TISON AB
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Filing date
Publication date
Application filed by MONSUN TISON AB filed Critical MONSUN TISON AB
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Publication of US3677141A publication Critical patent/US3677141A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D10/00—District heating systems
    • F24D10/003—Domestic delivery stations having a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/17—District heating

Definitions

  • the present invention relates to a fluid-controlled bufier device in cylinders having a fluid-operated working piston, comprising a buffer piston concentrically mounted at the end of the working piston and having a substantially less diameter than the working piston, said buffer piston being adapted to enter and gradually throttle a bore communicating with a fluid outlet opening of the cylinder when the working piston is approaching an end position.
  • a buffer device of this kind is used for protecting the working cylinders and connected machine elements from high stresses caused by the working piston touching the end wall of the cylinder.
  • a certain damping of the working piston motion in its end position can be obtained in a simple way by closing the outlet opening from the cylinder a predetermined distance before the end position of the working piston and pass the remaining fluid to a fixed or adjustable throttle valve.
  • This kind of damping is not particularly effective because the damping pressure decreases when the velocity of the working piston decreases at a constant throttle area.
  • the object of the present invention is to obtain a buffer device in which the abovementioned inconveniences are eliminated.
  • the bulfer device which is characterized in that said buffer piston consists of a cylindrical body having a cylindrical surface and said bore has a cylindrical surface having a diameter exceeding the diameter of the cylindrical body so that independant of the usual radial play between the working piston and the cylinder an annular clearance is formed between the cylindrical surfaces of the cylindrical body and the bore when the cylindrical body is positioned in the bore, in which annular clearance a resilient sealing-ring having a non-deformable cross section area is mounted in an annular notch located in either of the cylindrical surfaces of the body and the bore with a radial play between the sealing-ring and the bottom of the notch permitting radial displacement of the body caused by the radial play between the working piston and the cylinder, said sealing-ring slidingly engaging the other of said cylindrical surfaces, and in that the cylindrical surface slidingly engaging said sealing-ring being provided with passages which when the cylindrical body is moved into the bore initially permit the escape of the fluid from the cylinder to the outlet opening but then are successively closed by the sealing-
  • the theoretically proper variation of the throttle area is obtained, i.e. a high damping efficiency.
  • a turbulent characteristic of the throttle area is obtained, i.e. no or small influences from temperature and viscosity variations of the fluid, as well as automatic centering effected by small lateral forces acting upon the buffer members, i.e. no or small influences by eccentricity and a reduced risk of seizing.
  • the sealing-ring can easily be displaced also during the damping operation under the influence of small lateral forces because it can be hydraulically balanced.
  • the improved damping is obtained at reduced demands as to shape exactness due to the fact that the sealing-ring is sealingly engaging the cylindrical body and the bore and that the area variations do not depend on the shape of the buffer piston.
  • FIG. 1 shows in section an embodiment of the invention in connection with a hydraulic cylinder
  • FIG. 2 shows partly in section a further embodiment of the invention.
  • FIG. 1 shows an end portion of a hydraulic cylinder 1 having an end wall 2.
  • the end wall 2 is provided with a concentric bore 3 communicating with a fluid outlet opening 4.
  • a working piston 6 attached to a piston rod 5 is slidingly mounted in the cylinder 1 and sealingly engaging the walls of the cylinder 1 by means of an elastic sealing-ring 7.
  • a cup-shaped sleeve 8 is fixedly mounted by means of a bottom pin 9 engaging a recess 10 in the end of the piston rod 5.
  • the outer diameter of the sleeve 8 is smaller than the diameter of the cylindrical bore 3 and the sleeve 8 is perforated by radial holes 11.
  • the clearance between bore 3 and sleeve 8 is adapted with reference to manufacturing tolerances and foreseen or permissible wear of the journalling means of the working piston and its piston rod to prevent touching of the sleeve 8 against the bore 3.
  • This clearance is sealed by a slotted sealing-ring l2 slidingly engaging the sleeve 8 and mounted in an annular notch 13 in bore 3 with a play corresponding to the clearance between sleeve 8 and bore 3.
  • the axial length of the notch 13 exceeds the axial dimension of the sealing-ring l2, and a number of passages 14 connect the bottom of the notch 13 and the cylinder chamber 15 in front of the working piston 6.
  • the end portion of the sleeve is provided with recesses 16 and intermediate sections 17.
  • the sections 17 guide the sealing-ring when being centered upon the sleeve at the same time as the fluid can flow through the recesses 16.
  • Similar grooves 11 can alternatively be arranged in the surface of the bore 3, as shown in FIG. 2, in which case the sealing-ring 12 is mounted in an annular notch on the buffer piston 8 and also the passages 14 are formed in the surface of the buffer piston 8.
  • the area variation is defined by a square root which corresponds to a buffer piston of known type having a concave shape instead of the usual conical shape which explains the bad damping characteristics of known buffer devices.
  • the theoretically proper by-pass area can easily be obtained by proper dimensioning of the passages 11 of the buffer device according to the invention in hydraulic as well as pneumatic cylinders.
  • a fluid-controlled buffer device in cylinders having a fluid-operated working piston comprising a buffer piston concentrically mounted at one end of the working piston and having a substantially smaller diameter than the diameter of working piston, a bore communicating with a fluid outlet at one end of said cylinder, said buffer piston being adapted to enter and gradually throttle said bore communicating with said fluid outlet upon the working piston approaching said end of the cylinder, said buffer piston comprising a cylindrical body, said bore having a diameter larger than the diameter of the cylindrical body as to form an annular clearance between the peripheral surfaces of the body and the bore upon the cylindrical body being positioned within the bore, a flexible slotted sealing ring having a non-deformable cross-sectional area being mounted in an annular notch located in at least one of said peripheral surfaces and extending into said annular clearance, said notch having a diameter facilitating radial play between the sealing ring and the peripheral surface of the notch to provide for radial displacement of the cylindrical body, said sealing ring slidingly engaging the other of said peripheral surfaces, axial recesses
  • a buffer device as claimed in claim 1 wherein said annular notch is formed in the peripheral surface of said cylindrical 3.
  • a buffer device as claimed in claim 1, wherein the passages comprises longitudinal grooves having varied lengths formed in the surface slidingly engaging the sealing ring, said longitudinal grooves each having length, width and depth dimensions corresponding to a predetermined flow area variation.
  • annular notch is dimensioned to provide for axial play between the sealing ring and the annular notch.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Damping Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)
US87910A 1969-11-07 1970-11-09 Device in fluid-containing cylinders having a fluid-operated piston Expired - Lifetime US3677141A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE15351/69A SE347046B (sv) 1969-11-07 1969-11-07

Publications (1)

Publication Number Publication Date
US3677141A true US3677141A (en) 1972-07-18

Family

ID=20300521

Family Applications (1)

Application Number Title Priority Date Filing Date
US87910A Expired - Lifetime US3677141A (en) 1969-11-07 1970-11-09 Device in fluid-containing cylinders having a fluid-operated piston

Country Status (7)

Country Link
US (1) US3677141A (sv)
JP (1) JPS4813916B1 (sv)
DE (1) DE2054750C3 (sv)
FI (1) FI56255C (sv)
GB (1) GB1332494A (sv)
NO (1) NO135153C (sv)
SE (1) SE347046B (sv)

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974910A (en) * 1975-02-28 1976-08-17 Papai Imre F Fluid cylinder decelerating means
US4190230A (en) * 1975-05-05 1980-02-26 Gebrueder Buehler Ag Scavenging air valve for cleaning tubular air filter bodies
US4206684A (en) * 1975-08-19 1980-06-10 Gosney James A Hydraulic jack
US4296675A (en) * 1979-07-16 1981-10-27 Aeroquip Corporation Cylinder cushion with contractable ring
WO1981003314A1 (en) * 1980-05-16 1981-11-26 Rockwell International Corp Controlled output force actuator
US4323427A (en) * 1979-09-10 1982-04-06 General Electric Company Deceleration buffer for hydraulic linear motion drive
US4387280A (en) * 1978-05-29 1983-06-07 General Electric Company High speed hydraulically-actuated operating system for an electric circuit breaker
US4470775A (en) * 1982-09-01 1984-09-11 Lonardo Vincent P Submersible deep well pump
US4715260A (en) * 1986-12-22 1987-12-29 General Electric Company Seal
US5313872A (en) * 1993-04-28 1994-05-24 Foster Raymond K End of stroke cushion for a linear hydraulic motor
US5333984A (en) * 1992-06-22 1994-08-02 Bayne Machine Works, Inc. Residential refuse collection cart lifter with universal features
US5413030A (en) * 1994-02-17 1995-05-09 Caterpillar Inc. Self-energizing snubber for a hydraulic motor
US5517898A (en) * 1995-03-29 1996-05-21 Korea Institute Of Machinery & Materials Pneumatic cylinder utilizing cushioning sleeves, quick exhaust valves and quick supply valves
US5826562A (en) * 1994-07-29 1998-10-27 Caterpillar Inc. Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same
WO1999048776A1 (en) * 1998-02-23 1999-09-30 Mcneilus Truck And Manufacturing, Inc. Improved lifting and tipping mechanism for front loading refuse truck
US6109536A (en) * 1998-05-14 2000-08-29 Caterpillar Inc. Fuel injection system with cyclic intermittent spray from nozzle
US6167795B1 (en) 1992-06-22 2001-01-02 Bayne Machine Works, Inc. Container box and lifter features
US6758127B2 (en) * 2000-12-20 2004-07-06 Imi Norgren Gmbh Pressurized medium activated working cylinder
EP1584502A1 (de) * 2004-04-08 2005-10-12 HEMSCHEIDT FAHRWERKTECHNIK GmbH & Co. KG Federungs- und Dämpfungseinrichtung für Kraftfahrzeuge
US20050226750A1 (en) * 2002-12-13 2005-10-13 Trw Automotive Gmbh Hydraulic cylinder
US20050280233A1 (en) * 2004-06-21 2005-12-22 Cole Jeffrey E Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle
US20050280232A1 (en) * 2004-06-21 2005-12-22 Cole Jeffrey E Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle
US20060021833A1 (en) * 2004-04-08 2006-02-02 Hemscheidt Fahrwerktechnik Gmbh & Co. Kg Suspension and damping device for motor vehicles
US20070001415A1 (en) * 2005-06-21 2007-01-04 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US20070012532A1 (en) * 2005-07-14 2007-01-18 Norgen Gmbh Working cylinder with terminal position damping
US20070017760A1 (en) * 2005-07-18 2007-01-25 Hemscheidt Fahrwerktechnik Gmbh & Co. Suspension arrangement for motor vehicles
US20080001375A1 (en) * 2004-06-21 2008-01-03 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US7374179B2 (en) 2004-06-21 2008-05-20 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US20080173169A1 (en) * 2006-11-29 2008-07-24 Smc Kabushiki Kaisha Fluid Pressure Cylinder
US20100116608A1 (en) * 2004-04-08 2010-05-13 Hemscheidt Fahrwerktechnik Gmbh & Co. Kg Suspension and damping device for motor vehicles
US20100140884A1 (en) * 2004-04-08 2010-06-10 Samsung Electronics Co., Ltd. Suspension and damping device for motor vehicles
CN101776104A (zh) * 2010-03-04 2010-07-14 合肥市力恒科技有限责任公司 单作用柱塞式缓冲液压油缸
CN101776105A (zh) * 2010-03-04 2010-07-14 合肥市力恒科技有限责任公司 单作用活塞式缓冲液压油缸
US20130032227A1 (en) * 2011-08-02 2013-02-07 Sugino Machine Limited Hydraulic feed-rate control apparatus
CN103466081A (zh) * 2012-06-06 2013-12-25 哈米尔顿森德斯特兰德公司 用于冲压气轮机的机电致动器阻尼装置
US20200191174A1 (en) * 2018-12-13 2020-06-18 Safran Landing Systems Canada Inc. Multi-channel hydraulic snubbing device
US11111936B2 (en) 2019-08-20 2021-09-07 Roller Bearing Company Of America, Inc. Piston assembly having reduced extend force and reduced displacement volume
US20240035495A1 (en) * 2022-07-29 2024-02-01 Kmt Waterjet Systems, Inc. Hydraulic surge dampener

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI56060C (fi) * 1976-02-23 1979-11-12 Rauma Repola Oy Slutstaellningsdaempare vid hydraulcylinder
FR2444828A1 (fr) * 1978-12-18 1980-07-18 Heurtey Metallurgie Perfectionnements apportes aux verins
JPS6034963U (ja) * 1983-08-19 1985-03-09 三菱自動車工業株式会社 自動車ボデ−のル−フ構造
JPS6139671U (ja) * 1984-08-16 1986-03-13 三菱自動車工業株式会社 ワンボツクス型自動車における車体構造
DE3545935A1 (de) * 1985-12-23 1987-06-25 Bbc Brown Boveri & Cie Kolben-zylinderanordnung
SE465529B (sv) * 1988-11-08 1991-09-23 Sven Erik Oeverstroem Tryckluftcylinder med anordning foer aendlaegesdaempning
JP5267888B2 (ja) * 2010-07-27 2013-08-21 ニチユ三菱フォークリフト株式会社 リフトシリンダ及びそれを備えたフォークリフト
CN103615432B (zh) * 2013-12-13 2016-08-17 蚌埠液力机械有限公司 叉车起升油缸缓冲结构
CN106678125B (zh) * 2016-12-05 2018-02-27 中船重工中南装备有限责任公司 一种液压启闭机油缸缓冲装置及操作方法
CN109578369A (zh) * 2018-12-04 2019-04-05 长安大学 一种伸缩动臂油缸的缓冲装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443312A (en) * 1944-03-06 1948-06-15 Hpm Dev Corp Pressure cylinder
US2853974A (en) * 1955-10-31 1958-09-30 Westinghouse Air Brake Co Piston cushioning arrangement for cylinders
US2911952A (en) * 1955-04-28 1959-11-10 Renault Double-acting pneumatic jack
US2991759A (en) * 1960-05-17 1961-07-11 John S Pilch Cushioning and flow control valve
US3380349A (en) * 1966-08-31 1968-04-30 F & E Mfg Company Vacuum motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443312A (en) * 1944-03-06 1948-06-15 Hpm Dev Corp Pressure cylinder
US2911952A (en) * 1955-04-28 1959-11-10 Renault Double-acting pneumatic jack
US2853974A (en) * 1955-10-31 1958-09-30 Westinghouse Air Brake Co Piston cushioning arrangement for cylinders
US2991759A (en) * 1960-05-17 1961-07-11 John S Pilch Cushioning and flow control valve
US3380349A (en) * 1966-08-31 1968-04-30 F & E Mfg Company Vacuum motor

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974910A (en) * 1975-02-28 1976-08-17 Papai Imre F Fluid cylinder decelerating means
US4190230A (en) * 1975-05-05 1980-02-26 Gebrueder Buehler Ag Scavenging air valve for cleaning tubular air filter bodies
US4206684A (en) * 1975-08-19 1980-06-10 Gosney James A Hydraulic jack
US4387280A (en) * 1978-05-29 1983-06-07 General Electric Company High speed hydraulically-actuated operating system for an electric circuit breaker
US4296675A (en) * 1979-07-16 1981-10-27 Aeroquip Corporation Cylinder cushion with contractable ring
US4323427A (en) * 1979-09-10 1982-04-06 General Electric Company Deceleration buffer for hydraulic linear motion drive
WO1981003314A1 (en) * 1980-05-16 1981-11-26 Rockwell International Corp Controlled output force actuator
US4399968A (en) * 1980-05-16 1983-08-23 Rockwell International Corporation Controlled output force actuator
US4470775A (en) * 1982-09-01 1984-09-11 Lonardo Vincent P Submersible deep well pump
US4715260A (en) * 1986-12-22 1987-12-29 General Electric Company Seal
US5333984A (en) * 1992-06-22 1994-08-02 Bayne Machine Works, Inc. Residential refuse collection cart lifter with universal features
US6167795B1 (en) 1992-06-22 2001-01-02 Bayne Machine Works, Inc. Container box and lifter features
US5503512A (en) * 1992-06-22 1996-04-02 Bayne Machine Works, Inc. Residential refuse collection cart lifter with universal features
US5313872A (en) * 1993-04-28 1994-05-24 Foster Raymond K End of stroke cushion for a linear hydraulic motor
US5413030A (en) * 1994-02-17 1995-05-09 Caterpillar Inc. Self-energizing snubber for a hydraulic motor
US5826562A (en) * 1994-07-29 1998-10-27 Caterpillar Inc. Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same
US5517898A (en) * 1995-03-29 1996-05-21 Korea Institute Of Machinery & Materials Pneumatic cylinder utilizing cushioning sleeves, quick exhaust valves and quick supply valves
WO1999048776A1 (en) * 1998-02-23 1999-09-30 Mcneilus Truck And Manufacturing, Inc. Improved lifting and tipping mechanism for front loading refuse truck
US5984609A (en) * 1998-02-23 1999-11-16 Mcneilus Truck And Manufacturing, Inc. Lifting and tipping mechanism for front loading refuse truck
US6033176A (en) * 1998-02-23 2000-03-07 Mcneilus Truck And Manufacturing, Inc. Lifting and tipping mechanism for front loading refuse truck
US6109536A (en) * 1998-05-14 2000-08-29 Caterpillar Inc. Fuel injection system with cyclic intermittent spray from nozzle
US6758127B2 (en) * 2000-12-20 2004-07-06 Imi Norgren Gmbh Pressurized medium activated working cylinder
US7171888B2 (en) * 2002-12-13 2007-02-06 Trw Automotive Gmbh Hydraulic cylinder
US20050226750A1 (en) * 2002-12-13 2005-10-13 Trw Automotive Gmbh Hydraulic cylinder
US20100140884A1 (en) * 2004-04-08 2010-06-10 Samsung Electronics Co., Ltd. Suspension and damping device for motor vehicles
EP2116403A1 (de) * 2004-04-08 2009-11-11 HEMSCHEIDT FAHRWERKTECHNIK GmbH & Co. KG Federungs- und Dämpfungseinrichtung für Kraftfahrzeuge
US20060021833A1 (en) * 2004-04-08 2006-02-02 Hemscheidt Fahrwerktechnik Gmbh & Co. Kg Suspension and damping device for motor vehicles
US8151953B2 (en) 2004-04-08 2012-04-10 Samsung Electronics Co., Ltd. Suspension and damping device for motor vehicles
EP1584502A1 (de) * 2004-04-08 2005-10-12 HEMSCHEIDT FAHRWERKTECHNIK GmbH & Co. KG Federungs- und Dämpfungseinrichtung für Kraftfahrzeuge
US20100116608A1 (en) * 2004-04-08 2010-05-13 Hemscheidt Fahrwerktechnik Gmbh & Co. Kg Suspension and damping device for motor vehicles
US20080001375A1 (en) * 2004-06-21 2008-01-03 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US7631884B2 (en) 2004-06-21 2009-12-15 Jeffrey E Cole Truck assembly for a skateboard, wheeled platform, or vehicle
US7216876B2 (en) 2004-06-21 2007-05-15 Cole Jeffrey E Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle
US20050280232A1 (en) * 2004-06-21 2005-12-22 Cole Jeffrey E Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle
US7374179B2 (en) 2004-06-21 2008-05-20 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US7040638B2 (en) 2004-06-21 2006-05-09 Jeffrey Eaton Cole Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle
US20050280233A1 (en) * 2004-06-21 2005-12-22 Cole Jeffrey E Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle
US20100090424A1 (en) * 2004-06-21 2010-04-15 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US20070001415A1 (en) * 2005-06-21 2007-01-04 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US7744100B2 (en) 2005-06-21 2010-06-29 Jeffrey E. Cole Truck assembly for a skateboard, wheeled platform, or vehicle
US20100001484A1 (en) * 2005-06-21 2010-01-07 Cole Jeffrey E Truck assembly for a skateboard, wheeled platform, or vehicle
US7635136B2 (en) 2005-06-21 2009-12-22 Jeffrey E. Cole Truck assembly for a skateboard, wheeled platform, or vehicle
US20070012532A1 (en) * 2005-07-14 2007-01-18 Norgen Gmbh Working cylinder with terminal position damping
US7581485B2 (en) * 2005-07-14 2009-09-01 Norgren Gmbh Working cylinder with terminal position damping
US7766136B2 (en) 2005-07-18 2010-08-03 Hemscheidt Fahrwerktechnik Gmbh & Co. Kg Suspension arrangement for motor vehicles
US20070017760A1 (en) * 2005-07-18 2007-01-25 Hemscheidt Fahrwerktechnik Gmbh & Co. Suspension arrangement for motor vehicles
US7798052B2 (en) 2006-11-29 2010-09-21 Smc Kabushiki Kaisha Fluid pressure cylinder
US20080173169A1 (en) * 2006-11-29 2008-07-24 Smc Kabushiki Kaisha Fluid Pressure Cylinder
CN101776105A (zh) * 2010-03-04 2010-07-14 合肥市力恒科技有限责任公司 单作用活塞式缓冲液压油缸
CN101776104A (zh) * 2010-03-04 2010-07-14 合肥市力恒科技有限责任公司 单作用柱塞式缓冲液压油缸
US8997625B2 (en) * 2011-08-02 2015-04-07 Sugino Machine Limited Hydraulic feed-rate control apparatus
US20130032227A1 (en) * 2011-08-02 2013-02-07 Sugino Machine Limited Hydraulic feed-rate control apparatus
CN103466081A (zh) * 2012-06-06 2013-12-25 哈米尔顿森德斯特兰德公司 用于冲压气轮机的机电致动器阻尼装置
US9511875B2 (en) 2012-06-06 2016-12-06 Hamilton Sundstrand Corporation Electromechanical actuator damping arrangement for ram air turbine
CN103466081B (zh) * 2012-06-06 2016-12-28 哈米尔顿森德斯特兰德公司 用于冲压气轮机的致动器以及用于展开其的方法
US20200191174A1 (en) * 2018-12-13 2020-06-18 Safran Landing Systems Canada Inc. Multi-channel hydraulic snubbing device
US11111936B2 (en) 2019-08-20 2021-09-07 Roller Bearing Company Of America, Inc. Piston assembly having reduced extend force and reduced displacement volume
US20240035495A1 (en) * 2022-07-29 2024-02-01 Kmt Waterjet Systems, Inc. Hydraulic surge dampener

Also Published As

Publication number Publication date
FI56255B (fi) 1979-08-31
DE2054750C3 (de) 1980-02-07
SE347046B (sv) 1972-07-24
NO135153C (sv) 1977-02-16
GB1332494A (en) 1973-10-03
DE2054750A1 (de) 1971-06-16
DE2054750B2 (de) 1979-06-07
FI56255C (fi) 1979-12-10
JPS4813916B1 (sv) 1973-05-01
NO135153B (sv) 1976-11-08

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