GB990104A - Improvements in or relating to hydraulic jacks - Google Patents

Improvements in or relating to hydraulic jacks

Info

Publication number
GB990104A
GB990104A GB2603663A GB2603663A GB990104A GB 990104 A GB990104 A GB 990104A GB 2603663 A GB2603663 A GB 2603663A GB 2603663 A GB2603663 A GB 2603663A GB 990104 A GB990104 A GB 990104A
Authority
GB
United Kingdom
Prior art keywords
valve
pressure
piston
jack
open
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
GB2603663A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2603663A priority Critical patent/GB990104A/en
Publication of GB990104A publication Critical patent/GB990104A/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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/42—Constructional features with self-contained pumps, e.g. actuated by hand
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

990,104. Hydraulic control systems. R. C. PEARSON. Feb. 17, 1964 [July 1, 1963], No. 26036/63. Heading F1P. [Also in Division F2] Valves 9 and 10 in the supply conduits 33 and 7 to opposite sides of a differential jack 1 are open during normal operation of the jack but close in the event of failure of the supply pressure. The valves are identical in construction and comprise a valve closure member 11 connected to a piston 15 and loaded to the closed position by a spring 13. With the valve in the closed position, the pressure of fluid in a chamber 14 acts equally on the valve closure and piston which is thus pressure balanced. A main piston 18, of larger area than the piston 15 is moved by fluid pressure acting in opposition to a spring 20 to open the valve at a predetermined pressure. In operation of the valve 10, the supply pressure is fed to a port 22 and through a branch 26 and non return 27 to act on the piston 18 to open the valve thus allowing flow between ports 22 and 24. If the supply pressure fails, the pressure acting on piston 18 can escape through passage 31 and the valve closes. However, if the jack continues moving to the left due to inertia, the pressure in the line 25 acts to hold the valve open to allow flow from port 24 to 22 thus acting as a deceleration valve for the jack until it is stopped. The valve 9 acts in a similar manner.
GB2603663A 1963-07-01 1963-07-01 Improvements in or relating to hydraulic jacks Expired GB990104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2603663A GB990104A (en) 1963-07-01 1963-07-01 Improvements in or relating to hydraulic jacks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2603663A GB990104A (en) 1963-07-01 1963-07-01 Improvements in or relating to hydraulic jacks

Publications (1)

Publication Number Publication Date
GB990104A true GB990104A (en) 1965-04-22

Family

ID=10237343

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2603663A Expired GB990104A (en) 1963-07-01 1963-07-01 Improvements in or relating to hydraulic jacks

Country Status (1)

Country Link
GB (1) GB990104A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469597A1 (en) * 1979-11-09 1981-05-22 Bennes Marrel Hydraulic cylinder brake valve
FR2479358A1 (en) * 1980-03-25 1981-10-02 Richier Sa Nle Indle Mechanical digger lifting jack with safety device - monitors pressure after flexible pipeline section to control automatic non-return valve which can be selectively inhibited
GB2312038A (en) * 1996-04-11 1997-10-15 Intersurgical Ltd Screw activated valve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2469597A1 (en) * 1979-11-09 1981-05-22 Bennes Marrel Hydraulic cylinder brake valve
FR2479358A1 (en) * 1980-03-25 1981-10-02 Richier Sa Nle Indle Mechanical digger lifting jack with safety device - monitors pressure after flexible pipeline section to control automatic non-return valve which can be selectively inhibited
GB2312038A (en) * 1996-04-11 1997-10-15 Intersurgical Ltd Screw activated valve
GB2312038B (en) * 1996-04-11 1998-05-06 Intersurgical Ltd Improvements in valves

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