US3898915A - Piston cylinder assembly - Google Patents

Piston cylinder assembly Download PDF

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Publication number
US3898915A
US3898915A US345826A US34582673A US3898915A US 3898915 A US3898915 A US 3898915A US 345826 A US345826 A US 345826A US 34582673 A US34582673 A US 34582673A US 3898915 A US3898915 A US 3898915A
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United States
Prior art keywords
piston
fluid
annular
resilient member
passage
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
US345826A
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English (en)
Inventor
Richard Neuman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yale Materials Handling Corp
Original Assignee
Eaton Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eaton Corp filed Critical Eaton Corp
Priority to US345826A priority Critical patent/US3898915A/en
Priority to FR7409192A priority patent/FR2223579B1/fr
Priority to FR7409193A priority patent/FR2223578B1/fr
Priority to GB1346074A priority patent/GB1404117A/en
Priority to DE2414873A priority patent/DE2414873A1/de
Priority to JP3513174A priority patent/JPS5618810B2/ja
Application granted granted Critical
Publication of US3898915A publication Critical patent/US3898915A/en
Assigned to YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND 31 FLEMINGTON NEW JERSEY 08822 reassignment YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND 31 FLEMINGTON NEW JERSEY 08822 ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EATON CORPORATION
Assigned to CITICORP NORTH AMERICA, INC., AS AGENT reassignment CITICORP NORTH AMERICA, INC., AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YALE MATERIALS HANDLING CORPORATION
Anticipated expiration legal-status Critical
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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or 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
    • 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
    • F15B15/1433—End caps
    • 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
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/57—Control of a differential pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure control
    • F15B2211/5753—Pilot pressure control for closing a valve
    • 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
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the valve is spring-biased to a first posi- [21] A N 345,826 tion and movable to a second position when the fluid pressure on one side of a spool within the valve exceeds the fluid pressure on the opposite side of the [52] :LSSI. 91/395, 91431059; Spool by a value in excess of the value Of the force of 51 nt. the springqhe spoohwheninitssecond positionpw [58] Fleld of 262 9 4 vents a flow of fluid to one side of the piston.
  • the pisl/ 0 ton cylinder assembly has a rod connected to one side of the piston and extending out of the cylinder.
  • the invention relates generally to an overload protection device for use on vehicles and, more particularly, to a piston cylinder assembly for use on such vehicles.
  • the present invention has application to devices such as a counterbalanced vehicle having a mast, boom, arm or other primary load member movable relative to a frame by a piston cylinder assembly interconnecting the primary load member and the frame and means operative to sense the difference in pressure on opposite sides of the piston and transmit this differential pressure signal to a suitable device to preclude further movement of the piston relative to the cylinder.
  • the rod of the piston cylinder assembly as it projects through one end of the cylinder, defines therewith an annular passage encircling the rod and communicating with the exterior of the cylinder and the chamber in the cylinder at the rod side of the piston, and means is provided to seal the annular passage when the piston is near the one end of the cylinder to entrap fluid between the piston and the one end of the cylinder and prevent contact therebetween thereby insuring that a positive pressure signal is available from that side of the piston for transmittal to the pressure sensing means.
  • An annular resilient seal which encircles the rod, is secured to the one side of the piston and projects toward the one end of the cylinder beyond the piston to encompass and seal the annular opening when the piston approaches the one end of the cylinder.
  • the annular passage of the piston cylinder assembly is adapted to be connected to a fluid receiving passage in a fluid circuit, and another passage, that is always in communication with the exterior of the cylinder and the fluid in the chamber at the rod end, is provided in the cylinder for transmitting a pressure signal to the pressure sensing means; the other passage and the annular passage form separate and distinct passages from the chamber at the rod end of the cylinder to the exterior of the cylinder.
  • FIG. 1 is a schematic plan view of a hydraulic circuit embodying a piston cylinder assembly according to the invention
  • I FIG. 2 is a side elevational view, in section, of onehalf of a piston cylinder assembly according to the invention.
  • FIG. 1 illustrates a hydraulic circuit having a conduit 12 interconnecting a pump 14 and a reservoir 16.
  • a conduit 18 connects pump 14 to a port of selector control 20.
  • Another port of selector control 20 is connected to reservoir 16 via conduit 22.
  • Conduits 24 and 26 are also connected to ports of selector control 20.
  • Selector control 20 is operative upon movement to: connect conduit 18 to conduit 26 and conduit 22 to conduit 24; connect conduit 18 to conduit 24 and conduit 22 to conduit 26; and connect conduit 18 to conduit 22.
  • a piston cylinder assembly 28 has a piston 30 having an annular side 32 partially defining a first chamber 34 in cylinder 36 and a full area side 38 partially defining a second chamber 40 in the cylinder. Conduits 24 and 41, respectively, communicate with first and second chambers 34 and 40 through first and second q d portions 42 and 44.
  • a push rod 46 is connected to annular side 32 of piston 30 and projects out of first end 42 of cylinder 36 through seal 48.
  • a resilient seal 50 is secured to and projects away from annular side 32 of piston 30.
  • a valve 52 includes a spool 54 that is movable between a first and second position in a generally cylindri' cal cavity 56.
  • Spool 54 includes a pair of end portions 58 and 60 that are rigidly interconnected by a reduced section 62. The end portions are in sliding engagement with the cylindrical wall of cavity 56.
  • End portion 58 has an annular side 64 partially defining first chamber 66 in cavity 56 while end portion 60 includes a full area side 68 partially defining second chamber 70 in cavity 56.
  • a pair of axially spaced annular spaces 86 and 88 are located intermediate chambers 66 and 70.
  • Projections 72 are secured to annular side 64 and adapted to contact one surface of a wall 74 that separates chamber 66 from a spring cavity 76 that is located in valve 52.
  • a rod 78 is secured at one end to end portion 58 and projects through an opening in wall 74 into spring cavity 76.
  • An annular seal 80 encircles rod 78 and separates the environment of chamber 66 from that of spring cavity 76.
  • a compression spring 82 under load. encircles rod 78 in spring cavity 76 and has one end contacting a surface of wall 74 and another end contacting a circular disk 84 that is secured to the other end of rod 78.
  • Spool 54 is illustrated in FIG. 1 in its first position. Annular-spaces 86 and 88 communicate with one another via the annular space around center section 62. Movement of spool 54 to the second position results in the cylindrical surface of end portion 58 sealing annular spaces 86 and 88 from one another. Conduits 26 and 41, respectively, communicate with annular spaces 86 and 88. Spool 54 acts as a valve to allow fluid to flow from conduit 26 around center section 62 to conduit 41 when spool 54 is located in its first position and to prevent fluid from flowing from conduit 26 around center section 62 to conduit 41 when spool 54.is located in its second position. Another conduit 90 communicates with annular space 86 and conduit 26. A one-way check valve 92 located in conduit 90 allows to flow only from annular space 86 to conduit 26.
  • the pressures of the fluids in chambers 34 and 40 are transmitted via conduits. 94 and 96, respectively, to chambers 66 and 70.
  • the ratio of the area of annular side 32 to the area of full area side 38 of piston 30 is equal to the ratio of the area of annular side 64 to the area of full area side 68 ofspool 54.
  • Movement of spool 54 is governed by the preload and rate of spring 82 and the difference in the pressures of the fluids in chambers 34 and 40.
  • the preload of the spring is governed by the maximum tensile force desired on rod 46 prior to the beginning of movement of spool 54 from its first to its second position and the rate of the spring is governed by theincremental pressure rise desired at full open to full closed position of spool 54.
  • piston cylinderassembly 28 is illustrated in detail and includes'an annular body portion 98 defining a cavity 100 that is enclosed by first and second ends 42 and 44.
  • Piston 30 is in sliding engagement with the inner cavity defining surface of body portion 98 and includes resilient seals 99 for preventing fluid flow between chambers 34 and 40.
  • Push rod 46 has a shoulder 102 in abutting engagment with piston 30.
  • a nut 104 in in threaded engagement with rod 46 to secure the rod and piston together.
  • a number of resilient seals I06 mountedin first end 42 encircle rod 46.
  • First end 42 includes an annular plate 108 secured to the body portion of first end 42 by a number of screws 110, only one shown. that are circumferentially spaced around rod 46.
  • An annular opening 112 in plate 108 defines an annular passage between rod 46 and plate 108 that communicates with chamber 34 and an annular cavity 114 in first end 42. Annular cavity 114 communicates with conduit 24. Annular seals 116 are located between plate 108 and the body portion of first end 42 to prevent fluid from flowing therebetween. Conduit 94 communicates with chamber 34 via a passage 117 through first end 42. As illustrated, in FIG. 2, passage 117 must be located in a position so that it is never sealed by piston 30.
  • annular cavity 1 18 defined by the outer surface of frusturn of a cone.
  • Annular cavity 118 is concentric with rod 46 and diverges in cross-sectional are from left to right in FIG. 2.
  • annular cavity 118 At the left-hand end of annular cavity 118 there is located an enlarge annular groove having an outer conical surface 120 diverging from right to left in FIG. 2 and beginning at the termination point of the surface defining annular cavity 118.
  • a resilient annular seal 122 conforms to surface 120 and is in abutting engagement with the outer cylindrical surface 128 of rod 46 juxtaposition piston 30.
  • the second end of annular seal 122 projects outwardly into chamber 34 away from the outermost surface 130 of piston 30 and includes a dish-shaped opening 132 converging outwardly from left to right in FIG. 2 and defined by the outer surface of a frustum of a cone. Dish-shaped opening 132 terminates at an outer circular edge 134. The diameter of outer circular edge 134 is greater than the diameter of annular opening 112 in plate 108. The outer cylindrical surface 136 of annular seal 122 is spaced from the defining surface of conical cavity 118.
  • selector control 20 is moved to communicate conduits l8 and 26 with one another and conduits 22 and 24 with one another. Fluid is thereby introduced into chamber 40 and removed from chamber 34 causing piston 30 to move to the right in FIG. 2.
  • outer edge 134 of seal 122 contacts surface 138 of plate 108 thus sealing annular passage 112 from chamber 34.
  • passage 112 is sealed fluid is no longer permitted to flow out of chamber 34 and further movement of piston 30 to the right in FIG. 2 will result only in an increase in pressure in chamber 34. Seal 122 is free to yield under the force of movement of piston 30 to the right and will eventually compress to conform in part to cavity 118.
  • seal 122 Due to the mass of material of seal 122 extending beyond surface 130 of piston 30 toward end 42, at no time will surface 130 of piston 30 contact surface 138 of cylinder 36. After seal 122 conforms in part to cavity 118 the remainder of seal 122 extending beyond surface 130 will compress between surfaces 130 and 138. During compression between surfaces 130 and 138 seal 122 tightly grips rod 46 due to the radial forces exerted by the pressure of the fluid in chamber 34. To cause piston 30 to move to the left in FIG. 2 selector control is moved to the position illustrated in FIG. 1. Fluid is forced through conduit 24 against seal 122. Seal 122 gives readily due to the reduced seal surface prcsented by dish-shaped opening 132 allowing fluid to enter chamber 34. Simultaneously, fluid in chamber 40 is free to flow to reservoir l6.via conduit 41 and either past center portion 62 or through check valve 92 into conduit 26.
  • FIG. 1 may be used in the same manner as a portion of the circuit illustrated and described in US. Letters Pat. No. 3,007,593 (Hancock).
  • valve 52 of the disclosure can be substituted for valve 16 of Hancock and piston cylinder assembly 28 of the disclosure can be substituted for tilting jack 6 of Hancock.
  • Other connections and substitutions will be obvious to those skilled in the art.
  • Other uses for the circuit are also contemplated.
  • a fluid actuated piston cylinder assembly having a fluid supply passage and a fluid receiving passage, for use with a fluid circuit, comprising:
  • a housing having a body portion intermediate first and second end portions, the body and end portions defining together a cavity
  • a piston within the cavity in sliding engagement with the body portion and dividing the cavity into first and second chambers, both chambers containing a fluid, the first chamber being partially defined by the first end portion;
  • a rod connected to the piston and extending out of the cavity through the first end portion, the first end portion and the rod defining therebetween an annular passage adapted to be the sole communication between the first chamber and the fluid receiving passage; and resilient member encircling the rod and having a first end engaging the piston and a second end projecting away from the piston towards the first end of the housing, the circumferential portion of the second end of the resilient member being of a size to encompass the annular passage and having a surface area normal to the axis of said resilient member that varies along the axis of said resilient member from a relatively small surface cross-sectional area at said second end to the full cross-sectional area of said resilient member at an axial position intermediate said first and second ends thereby presenting a sealing surface when abutting the first end portion of the cylinder which is substantially smaller in cross-sectional area than the total crosssectional area of said resilient member;
  • the resilient member seals the annular passage entrapping a quantity of fluid between the piston and the fluid end, thereby ensuring that a fluid pressure is maintained within the first chamber.
  • a piston cylinder assembly according to claim I further comprising means defining a sensing passage in the housing communicating with the first chamber and the exterior of the housing, the sensing passage being located for communication with entrapped quantities of fluid.
  • a piston cylinder assembly comprising:
  • a housing having a body portion intermediate first and second end portions, the body and end portions together defining a cavity
  • a rod connected to the piston and extending out of the cavity through the first end portion, the first end portion and the rod defining therebetween an annular passage in communication with the cavity and the exterior of the housing;
  • annular resilient member encircling the rod and having first and second ends, with the first end engaging the piston, and the second end projecting away from the piston toward the first end portion to contact the cavity defining surface of the first end portion when the piston is located a given distance away from the first end portion, and having a cross-sectional area which encompasses the portion of the annular passage communicating with the cavity and having a surface area normal to the axis of said resilient member that varies along the axis of said resilient member from a relatively small surface cross-sectional area at said second end to the full cross-sectional area of said resilient member at an axial position intermediate said first and second ends to maintain a quantity of fluid between the piston and the first end portion upon contact between the second end of the resilient member and the first end portion to prevent direct contact between the piston and the first end portion and to form a minimal area seal encompassing said annular passage.
  • the piston defines an radially outwardly extending annular opening
  • the resilient member is substantially cylindrical in configuration
  • the first end of the resilient member has an annular shoulder in mating engagement with the annular opening in the piston.
  • a piston cylinder assembly according to claim 4 wherein:
  • a dish-shaped opening is located within the second end of the resilient member
  • the second end has a circular outer edge having a diameter greater than the diameter of the annular passage and defining the outer boundary of the dish-shaped opening.
  • a piston cylinder assembly according to claim 4 further comprising means defining a sensing passage in the housing communicating with the first chamber and the exterior of the housing, the passage being separate from the annular passage and located to communicate with the space between the piston and the first end por-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
US345826A 1973-03-28 1973-03-28 Piston cylinder assembly Expired - Lifetime US3898915A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US345826A US3898915A (en) 1973-03-28 1973-03-28 Piston cylinder assembly
FR7409192A FR2223579B1 (cg-RX-API-DMAC7.html) 1973-03-28 1974-03-19
FR7409193A FR2223578B1 (cg-RX-API-DMAC7.html) 1973-03-28 1974-03-19
GB1346074A GB1404117A (en) 1973-03-28 1974-03-26 Piston cylinder assembly
DE2414873A DE2414873A1 (de) 1973-03-28 1974-03-27 Kolbenzylinderanordnung
JP3513174A JPS5618810B2 (cg-RX-API-DMAC7.html) 1973-03-28 1974-03-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US345826A US3898915A (en) 1973-03-28 1973-03-28 Piston cylinder assembly

Publications (1)

Publication Number Publication Date
US3898915A true US3898915A (en) 1975-08-12

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Application Number Title Priority Date Filing Date
US345826A Expired - Lifetime US3898915A (en) 1973-03-28 1973-03-28 Piston cylinder assembly

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US (1) US3898915A (cg-RX-API-DMAC7.html)
JP (1) JPS5618810B2 (cg-RX-API-DMAC7.html)
DE (1) DE2414873A1 (cg-RX-API-DMAC7.html)
FR (2) FR2223578B1 (cg-RX-API-DMAC7.html)
GB (1) GB1404117A (cg-RX-API-DMAC7.html)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024635A (en) * 1988-08-04 1991-06-18 Robinson Leslie K Relating to ram units in transmissions of the toroidal race, rolling traction type
WO1995034759A1 (en) * 1994-06-15 1995-12-21 Ab Multidock Hydraulic Hydraulic piston cylinder
EP1557571A3 (en) * 2004-01-24 2005-12-14 Bosch Rexroth Teknik AB Cushioning element, cushioning arrangement and fluid cylinder
CN103359660A (zh) * 2012-03-26 2013-10-23 株式会社伊丹精机 升降液压缸及具备它的叉车
US20140096679A1 (en) * 2012-10-09 2014-04-10 Christopher McAuliffe Multi-part piston
US10975895B2 (en) * 2019-03-06 2021-04-13 Showa Corporation Piston structure body and lifting device of watercraft propulsion apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3616234A1 (de) * 1986-05-14 1987-11-19 Bayerische Motoren Werke Ag Vorrichtung zur relativen drehlagenaenderung zweier in antriebsverbindung stehender wellen, insbesondere zwischen in einem maschinengehaeuse einer brennkraftmaschine gelagerten kurbelwelle und nockenwelle

Citations (8)

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Publication number Priority date Publication date Assignee Title
US2319608A (en) * 1941-11-07 1943-05-18 Southwestern Eng Co Fluid motor
US2321079A (en) * 1940-01-30 1943-06-08 Harold A Greenwald Hydraulic door operator
US2556698A (en) * 1945-02-05 1951-06-12 G F Goodson Piston construction
US2642845A (en) * 1950-12-20 1953-06-23 Westinghouse Air Brake Co Piston cushioning apparatus
US2984529A (en) * 1959-01-26 1961-05-16 Baldwin Rubber Co Unitary sealed piston
US3072108A (en) * 1961-10-02 1963-01-08 Bendix Corp Multi-position vacuum motor
US3143933A (en) * 1962-12-03 1964-08-11 Norton Engineering Inc Cylinder and sealing ring combination
US3329068A (en) * 1966-04-15 1967-07-04 Signode Corp Pneumatic piston return system for impact tools

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2321079A (en) * 1940-01-30 1943-06-08 Harold A Greenwald Hydraulic door operator
US2319608A (en) * 1941-11-07 1943-05-18 Southwestern Eng Co Fluid motor
US2556698A (en) * 1945-02-05 1951-06-12 G F Goodson Piston construction
US2642845A (en) * 1950-12-20 1953-06-23 Westinghouse Air Brake Co Piston cushioning apparatus
US2984529A (en) * 1959-01-26 1961-05-16 Baldwin Rubber Co Unitary sealed piston
US3072108A (en) * 1961-10-02 1963-01-08 Bendix Corp Multi-position vacuum motor
US3143933A (en) * 1962-12-03 1964-08-11 Norton Engineering Inc Cylinder and sealing ring combination
US3329068A (en) * 1966-04-15 1967-07-04 Signode Corp Pneumatic piston return system for impact tools

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024635A (en) * 1988-08-04 1991-06-18 Robinson Leslie K Relating to ram units in transmissions of the toroidal race, rolling traction type
WO1995034759A1 (en) * 1994-06-15 1995-12-21 Ab Multidock Hydraulic Hydraulic piston cylinder
US5806406A (en) * 1994-06-15 1998-09-15 Ab Multidock Hydraulic Hydraulic piston cylinder
EP1557571A3 (en) * 2004-01-24 2005-12-14 Bosch Rexroth Teknik AB Cushioning element, cushioning arrangement and fluid cylinder
CN103359660A (zh) * 2012-03-26 2013-10-23 株式会社伊丹精机 升降液压缸及具备它的叉车
CN103359660B (zh) * 2012-03-26 2016-12-14 株式会社伊丹精机 升降液压缸及具备它的叉车
US20140096679A1 (en) * 2012-10-09 2014-04-10 Christopher McAuliffe Multi-part piston
US9194491B2 (en) * 2012-10-09 2015-11-24 Hamilton Sundstrand Corporation Multi-part piston
US10975895B2 (en) * 2019-03-06 2021-04-13 Showa Corporation Piston structure body and lifting device of watercraft propulsion apparatus

Also Published As

Publication number Publication date
DE2414873A1 (de) 1974-10-10
JPS5618810B2 (cg-RX-API-DMAC7.html) 1981-05-01
GB1404117A (en) 1975-08-28
FR2223579A1 (cg-RX-API-DMAC7.html) 1974-10-25
JPS5025983A (cg-RX-API-DMAC7.html) 1975-03-18
FR2223579B1 (cg-RX-API-DMAC7.html) 1979-09-28
FR2223578A1 (cg-RX-API-DMAC7.html) 1974-10-25
FR2223578B1 (cg-RX-API-DMAC7.html) 1978-01-13

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