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GB872471A - Hydraulic device for a reciprocal motion subject to load reversal - Google Patents

Hydraulic device for a reciprocal motion subject to load reversal

Info

Publication number
GB872471A
GB872471A GB3942457A GB3942457A GB872471A GB 872471 A GB872471 A GB 872471A GB 3942457 A GB3942457 A GB 3942457A GB 3942457 A GB3942457 A GB 3942457A GB 872471 A GB872471 A GB 872471A
Authority
GB
United Kingdom
Prior art keywords
piston
valve
pump
line
chamber
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
GB3942457A
Inventor
Fritz Berg
Hans-Dieter Hennig
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.)
EBERSWALDE KRANBAU
Original Assignee
EBERSWALDE KRANBAU
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 EBERSWALDE KRANBAU filed Critical EBERSWALDE KRANBAU
Priority to GB3942457A priority Critical patent/GB872471A/en
Publication of GB872471A publication Critical patent/GB872471A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01Locking-valves or other detent i.e. load-holding devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00Other constructional features or details
    • B66C13/18Control systems or devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes 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
    • B66C23/62Constructional features or details
    • B66C23/82Luffing gear
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00Cranes
    • B66C2700/06Cranes in which the lifting movement is done with a hydraulically controlled plunger

Landscapes

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

Abstract

872,471. Hydraulic machines. KRANBAU EBERSWALDE VEB. Dec. 19, 1957, No. 39424/57. Class 69 (2). A differential piston 5a for driving a load subject to reversal, e.g. the jib of a crane, is driven by a reversible pump 1 connected in a closed system, an auxiliary pump 8 compensating for the difference in effective area of the two sides of the piston 5a. The pump 8 maintains the system filled with oil at a predetermined pressure controlled by a valve 9 by way of valves 10, 11. When pump 1 is supplying line 2, pressure fluid passes through valve 17 to chamber 7 to move piston 5a to the left, and over line 12 forces the piston 15 of valve 13 to its left terminal position (shown) whereby fluid displaced from chamber 6 is passed by valve 13 over line 3 to the suction side of pump 1. During this operation pump 8 supplies oil to the suction side of the pump 1 via valve 10. Should the load on the piston-rod 5 reverse, the consequential drop in pressure in chamber 7 and line 12 causes piston 15 to be moved to the right by spring 14 to throttle the flow of oil from chamber 6 to line 3 and thus brake the piston 5a until the pressure in chamber 7 and line 12 builds up to move valve piston 15 to the left to remove the braking action on piston 5a. When pump 1 is supplying line 3, pressure fluid passes via line 19a and a valve 16 to chamber 6 to move piston 5a to the right, whereby oil is returned to the suction side of pump 1 over line 2. At the same time, pressure fluid via line 19 moves the piston 20a of valve 17 to the right so that the excess oil displaced from chamber 7 is passed over line 18 back to a reservoir 22. Should the load on the piston 5a reverse, the piston 20a is moved to the left by spring 21 and the valve 17 throttles the return of oil over line 18 to brake the piston 5a. Two or more working cylinders may be used with their pistons 5a connected hydraulically in parallel.
GB3942457A 1957-12-19 1957-12-19 Hydraulic device for a reciprocal motion subject to load reversal Expired GB872471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3942457A GB872471A (en) 1957-12-19 1957-12-19 Hydraulic device for a reciprocal motion subject to load reversal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3942457A GB872471A (en) 1957-12-19 1957-12-19 Hydraulic device for a reciprocal motion subject to load reversal

Publications (1)

Publication Number Publication Date
GB872471A true GB872471A (en) 1961-07-12

Family

ID=10409462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3942457A Expired GB872471A (en) 1957-12-19 1957-12-19 Hydraulic device for a reciprocal motion subject to load reversal

Country Status (1)

Country Link
GB (1) GB872471A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203185A (en) * 1963-10-24 1965-08-31 New York Air Brake Co Hydrostatic transmission
GB2236361A (en) * 1989-09-08 1991-04-03 Ingersoll Rand Co Closed loop hydraulic fluid system
GB2266930B (en) * 1992-05-15 1995-12-20 Hoerbiger Ventilwerke Ag Hydraulic arrangement for a vehicle cover
US5575150A (en) * 1995-04-12 1996-11-19 Northrop Grumman Corporation Stiffness enhanced electrohydrostatic actuator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203185A (en) * 1963-10-24 1965-08-31 New York Air Brake Co Hydrostatic transmission
GB2236361A (en) * 1989-09-08 1991-04-03 Ingersoll Rand Co Closed loop hydraulic fluid system
AU636877B2 (en) * 1989-09-08 1993-05-13 Ingersoll-Rand Company Closed loop drill feed system
GB2236361B (en) * 1989-09-08 1993-12-01 Ingersoll Rand Co Closed loop hydraulic fluid system
GB2266930B (en) * 1992-05-15 1995-12-20 Hoerbiger Ventilwerke Ag Hydraulic arrangement for a vehicle cover
US5575150A (en) * 1995-04-12 1996-11-19 Northrop Grumman Corporation Stiffness enhanced electrohydrostatic actuator

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