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GB1416212A - Machines having a component movable in extend and retract directions by at least one hydraulic cylinder - Google Patents

Machines having a component movable in extend and retract directions by at least one hydraulic cylinder

Info

Publication number
GB1416212A
GB1416212A GB3556773A GB3556773A GB1416212A GB 1416212 A GB1416212 A GB 1416212A GB 3556773 A GB3556773 A GB 3556773A GB 3556773 A GB3556773 A GB 3556773A GB 1416212 A GB1416212 A GB 1416212A
Authority
GB
United Kingdom
Prior art keywords
machines
extend
spool
hydraulic cylinder
valve
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
Application number
GB3556773A
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.)
Harnischfeger Corp
Original Assignee
Harnischfeger 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 Harnischfeger Corp filed Critical Harnischfeger Corp
Publication of GB1416212A publication Critical patent/GB1416212A/en
Expired legal-status Critical Current

Links

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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control And Safety Of Cranes (AREA)

Abstract

1416212 Hydraulic control circuits HARNISCHFEGER CORP 26 July 1973 [14 Aug 1972] 35567/73 Heading F1P Rams 16, 17, Fig. 2, which luff the jib of a mobile crane, Fig. 1, (not shown), have holding valves 36, 37 which hold the rams in extended position and are opened by pilot pressure from a separate pump 38 when a luffing control lever 81 moves a valve spool 82 from a "neutral" position to a "lower" position. A valve 40 controls the pilot pressure supply to valves 36, 37 and the spool 80 of valve 40 is mechanically connected to the spool 82 and lever 81, Fig. 3, (not shown). Pump 38 also supplies-winch brakevalves 42, 43.
GB3556773A 1972-08-14 1973-07-26 Machines having a component movable in extend and retract directions by at least one hydraulic cylinder Expired GB1416212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28048272A 1972-08-14 1972-08-14

Publications (1)

Publication Number Publication Date
GB1416212A true GB1416212A (en) 1975-12-03

Family

ID=23073265

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3556773A Expired GB1416212A (en) 1972-08-14 1973-07-26 Machines having a component movable in extend and retract directions by at least one hydraulic cylinder

Country Status (7)

Country Link
US (1) US3777899A (en)
JP (1) JPS4951476A (en)
BR (1) BR7306190D0 (en)
DE (1) DE2340431A1 (en)
FR (1) FR2196442B1 (en)
GB (1) GB1416212A (en)
IT (1) IT990111B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2268780A (en) * 1992-06-24 1994-01-19 Gullick Dobson Ltd Mining apparatus

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102250A (en) * 1976-08-16 1978-07-25 Caterpillar Tractor Co. Load check and bypass valve
US5927520A (en) * 1995-10-06 1999-07-27 Kidde Industries, Inc. Electro-hydraulic operating system for extensible boom crane
US5937646A (en) * 1997-07-10 1999-08-17 Mi-Jack Products Hydraulic charge boost system for a gantry crane
CN102297180B (en) * 2011-08-09 2013-01-02 三一重工股份有限公司 Supporting leg locking system and mobile engineering machinery
CN102425585A (en) * 2011-12-07 2012-04-25 中联重科股份有限公司 Closed hydraulic system of pumping device and control method thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768500A (en) * 1955-05-20 1956-10-30 Oilgear Co Hydraulic drive
US3371799A (en) * 1967-03-01 1968-03-05 Baldwin Lima Hamilton Corp Telescopic boom angle control system
DE1949712A1 (en) * 1968-11-19 1970-06-11 Ind Karl Marx Stadt Veb Hydraulic control device
US3641876A (en) * 1969-11-12 1972-02-15 American Hoist & Derrick Co Two-speed hydraulic control system
US3605561A (en) * 1969-12-22 1971-09-20 Pettibone Corp One handle sequence selecting valving for crowd cylinders
US3721350A (en) * 1970-02-12 1973-03-20 Fmc Corp Boom extension control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2268780A (en) * 1992-06-24 1994-01-19 Gullick Dobson Ltd Mining apparatus

Also Published As

Publication number Publication date
FR2196442A1 (en) 1974-03-15
BR7306190D0 (en) 1974-06-27
US3777899A (en) 1973-12-11
FR2196442B1 (en) 1976-11-19
IT990111B (en) 1975-06-20
DE2340431A1 (en) 1974-02-28
JPS4951476A (en) 1974-05-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee