US3871265A - Hydraulic cylinder assembly for telescopic boom - Google Patents

Hydraulic cylinder assembly for telescopic boom Download PDF

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Publication number
US3871265A
US3871265A US336785A US33678573A US3871265A US 3871265 A US3871265 A US 3871265A US 336785 A US336785 A US 336785A US 33678573 A US33678573 A US 33678573A US 3871265 A US3871265 A US 3871265A
Authority
US
United States
Prior art keywords
cylinder
valve
boom
passage
extended
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
US336785A
Other languages
English (en)
Inventor
Ryosuke Koga
Kazuhiro Nonome
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.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
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 Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Application granted granted Critical
Publication of US3871265A publication Critical patent/US3871265A/en
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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks

Definitions

  • the present invention is characterized in that a sequential circuit for effecting the sequential control of a plurality of hydraulic cylinders is eliminated, and in that a first valve is inserted into a passage of a first cylinder fixed to an outer boom member into which flows the working oil under pressure when the first hydraulic cylinder is extended, the first valve being adapted to be opened by the pressure of the working oil under pressure when the first cylinder is extended and also to be mechanically opened when a second cylinder which is fixed to an intermediate boom member is fully retracted; and a second valve is inserted into a passage interconnecting the passage of the first cylinder and a port of the second cylinder through which the working oil under pressure enters into the second cylinder for extending the same, the second valve being adapted to be mechanically opened by the first cylinder when the latter is extended to its full length and also to be opened by the pressure of the working oil generated in the second cylinder when the latter is retracted.
  • Each of the lower and upper cylinders 12 and 13 generally comprises a cylinder barrel 17 or 18 and a piston rod 19 or 20 slidably fitted into the cylinder barrel 17 or 18.
  • the cylinder barrels 17 and 18 are joined together with a connecting pin 23 and ring members 21 and 22 fitted over the cylinder barrels 17 and 18 respectively.
  • the piston rod 19 extended out of the lower cylinder 12 of the hydraulic cylinder assembly 10 is provided with a piston rod head 24 joined to a bracket 25 having a hole 26 into which is fitted a connecting pin 27 having both ends securely fixed to the inner wall of the outer boom 14.
  • the cylinder barrel 17 is provided with a cylinder bottom 28 to which is attached a valve body 30 with screws 29, and an annular member 31 is fitted over the valve body 30 and securely held in position by means of a snap ring 32.
  • a guide member 33 extending from the annular member 31 slidably rests upon the inner surface of the inner boom 16 so that the lower cylinder 12 is supported.
  • a piston 39 which slidably contacts with the inner wall of the cylinder barrel 17 through seals 38 and which divides the cylinder barrel 17 into two chambers 40 and 41.
  • the chamber 40 is sealed by seals 43 interposed between a cylinder head 42 fixed to the cylinder barrel 17 and the piston rod 19 whereas the chamber 41 is closed by the cylinder bottom 28.
  • valve body 60 which interrupts or permits the communication between the boom-extending oil opening 57 and the intermediate ports 55.
  • a plug 61 is screwed into the opening of the valve body on the side of the boom-retracting oil opening 56.
  • the valve body 60 is normally pressed against a valve seat 64 under the force of a spring 63 which is loaded between the lower end of the valve body 60 and a spring seat 62 which is screwed into the boom-extending oil opening 57, so that the intercommunication between the intermediate ports 55 and the boom-extending oil opening 57 is interrupted.
  • the valve body 30 is fixed to the cylinder bottom 28 of the lower cylinder 12; from it, and within the pipe 47 extends a first pipe 77 through the cylinder bottom 28 and a spacer 76 of the piston 30, and in like manner a second pipe 78 extends within the first pipe 77.
  • two communication passages 79 and 80 are defined between the first and second pipes 77 and 78 and within the second pipe 78.
  • valve 82 comprises a valve seat 83 fixed to the base of the first pipe 77, a spring seat 84 fixed to the base of the second pipe 78, a valve body 85 disposed between the valve seat 83 and the spring seat 84 and slidably fitted over the second pipe 78, and a spring 86 loaded between the spring seat 84 and the valve body 85 so that the latter may be normally pressed against the valve seat 83.
  • the first valve body 94 is normally pressed into engagement with a valve set 101 under the force of a spring 100 which is loaded between the first valve body 94 and a spring seat 99 which is screwed into a left opening 98 of the valve case 93, so that due to such engagement the communication between the intermediate openings 92 of the valve case 93 and the left opening 98 is interrupted.
  • the inner boom 16 is retracted to the full extent so that a push lever 102 fixed to the inner wall thereof engages with a push rod 103 extending from the right end of the valve body 94, the
  • a normally closed second valve in said second passage and operative to open when fluid pressure in said second unit exceeds a predetermined value

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)
US336785A 1972-03-02 1973-02-28 Hydraulic cylinder assembly for telescopic boom Expired - Lifetime US3871265A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972025883U JPS5512006Y2 (ko) 1972-03-02 1972-03-02

Publications (1)

Publication Number Publication Date
US3871265A true US3871265A (en) 1975-03-18

Family

ID=12178165

Family Applications (1)

Application Number Title Priority Date Filing Date
US336785A Expired - Lifetime US3871265A (en) 1972-03-02 1973-02-28 Hydraulic cylinder assembly for telescopic boom

Country Status (3)

Country Link
US (1) US3871265A (ko)
JP (1) JPS5512006Y2 (ko)
DE (1) DE2310550C3 (ko)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325763A (en) * 1993-04-28 1994-07-05 Foster Raymond K Internal check valve
US5355769A (en) * 1992-07-23 1994-10-18 Magna Pow'r, Inc. Sequentially operated cylinders with load holding valve integrated system
US6536325B2 (en) * 2000-07-11 2003-03-25 Partek Cargotec, S.A. Hydraulic cylinder for telescopic arms
US20070175850A1 (en) * 2005-08-01 2007-08-02 Mikica Rafailovic Telescopable sliding beam
WO2021202831A1 (en) * 2020-04-01 2021-10-07 Terex South Dakota, Inc. Boom assembly with translatable counterbalance mass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401510B (de) * 1991-10-21 1996-09-25 Palfinger Ag Ladekran

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3426649A (en) * 1963-11-29 1969-02-11 Rheinstahl Wanheim Gmbh Multistage hydraulic mine prop
US3595264A (en) * 1970-01-09 1971-07-27 Parker Hannifin Corp Load control and holding valve
US3672257A (en) * 1969-03-17 1972-06-27 Tadano Tekkosho Kk Extension means of a multi-stage boom

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7142813U (de) * 1972-02-17 Palfinger Hydraulik Kg Lastarm für Autokrane
DE963750C (de) * 1955-06-22 1957-05-09 Demag Ag Hydraulischer Zylinder mit teleskopartig ineinanderschiebbaren Kolben
US3250182A (en) * 1963-08-01 1966-05-10 Harold K Nansel Multiple extension apparatus
DE1568630A1 (de) * 1966-11-30 1970-10-22 Hoechst Ag Verfahren zur Herstellung von 15 alpha-Halogen-14ss-hydroxy-card-20(22)-enoliden
DE1807158A1 (de) * 1968-11-06 1970-06-11 Gilberg Hans Peter Doppeltwirkender Hydraulikzylinder fuer teleskopartig ausschiebbare Kranausleger
JPS5028593B1 (ko) * 1970-01-14 1975-09-17

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3426649A (en) * 1963-11-29 1969-02-11 Rheinstahl Wanheim Gmbh Multistage hydraulic mine prop
US3672257A (en) * 1969-03-17 1972-06-27 Tadano Tekkosho Kk Extension means of a multi-stage boom
US3595264A (en) * 1970-01-09 1971-07-27 Parker Hannifin Corp Load control and holding valve

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355769A (en) * 1992-07-23 1994-10-18 Magna Pow'r, Inc. Sequentially operated cylinders with load holding valve integrated system
US5325763A (en) * 1993-04-28 1994-07-05 Foster Raymond K Internal check valve
AU654926B1 (en) * 1993-04-28 1994-11-24 Raymond Keith Foster Internal check valve
US6536325B2 (en) * 2000-07-11 2003-03-25 Partek Cargotec, S.A. Hydraulic cylinder for telescopic arms
ES2194560A1 (es) * 2000-07-11 2003-11-16 Partek Cargotec S A Cilindro hidraulico para brazos telescopicos.
US20070175850A1 (en) * 2005-08-01 2007-08-02 Mikica Rafailovic Telescopable sliding beam
US7703616B2 (en) * 2005-08-01 2010-04-27 Liebherr-Werk Ehingen Gmbh Telescopable sliding beam
WO2021202831A1 (en) * 2020-04-01 2021-10-07 Terex South Dakota, Inc. Boom assembly with translatable counterbalance mass
US11999602B2 (en) 2020-04-01 2024-06-04 Terex South Dakota, Inc. Boom assembly with translatable counterbalance mass

Also Published As

Publication number Publication date
JPS5512006Y2 (ko) 1980-03-15
DE2310550B2 (de) 1981-04-23
DE2310550A1 (de) 1973-09-06
JPS48102484U (ko) 1973-12-01
DE2310550C3 (de) 1982-01-07

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