EP0019597A3 - Safety device for hydraulic circuits - Google Patents

Safety device for hydraulic circuits Download PDF

Info

Publication number
EP0019597A3
EP0019597A3 EP80830027A EP80830027A EP0019597A3 EP 0019597 A3 EP0019597 A3 EP 0019597A3 EP 80830027 A EP80830027 A EP 80830027A EP 80830027 A EP80830027 A EP 80830027A EP 0019597 A3 EP0019597 A3 EP 0019597A3
Authority
EP
European Patent Office
Prior art keywords
safety device
fluid
arm
actuator
line
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.)
Withdrawn
Application number
EP80830027A
Other languages
German (de)
French (fr)
Other versions
EP0019597A2 (en
Inventor
Giuseppe Cinotto
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.)
CHS GIUSEPPE CINOTTO HYDRAULIC SYSTEM SpA
Original Assignee
CHS GIUSEPPE CINOTTO HYDRAULIC SYSTEM SpA
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 CHS GIUSEPPE CINOTTO HYDRAULIC SYSTEM SpA filed Critical CHS GIUSEPPE CINOTTO HYDRAULIC SYSTEM SpA
Publication of EP0019597A2 publication Critical patent/EP0019597A2/en
Publication of EP0019597A3 publication Critical patent/EP0019597A3/en
Withdrawn legal-status Critical Current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
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)

Abstract

A safety device (24) is provided for use, for example, in conjunction with a double-acting hydraulic actuator (18) operating a lifting arm. The safety device (24) is interposed between the actuator (18) and the fluid line (20) along which fluid is supplied to raise the arm. In the event of accidental rupturing of this fluid line (20), the safety device (24) operates to prevent uncontrolled lowering of the arm. The device (24) has a working section which comprises a non-return valve (36) inserted in said line (20) such as to normally only allow fluid into the actuator (18), and control means selectively operable to inhibit the non-return valve (36) and permit fluid to exit from the actuator (18). The control means is itself controlled from a controlling section of the device (24) in such a manner that the control means only operates in the presence both of a control pressure signal (Ps) indicating that the arm is to be lowered, and of normal operating pressures in said line (20).
EP80830027A 1979-05-18 1980-05-06 Safety device for hydraulic circuits Withdrawn EP0019597A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6806179 1979-05-18
IT68061/79A IT1118648B (en) 1979-05-18 1979-05-18 SAFETY DEVICE FOR HYDRAULIC CIRCUITS, ESPECIALLY OF LIFT AND SIMILAR EXCAVATORS

Publications (2)

Publication Number Publication Date
EP0019597A2 EP0019597A2 (en) 1980-11-26
EP0019597A3 true EP0019597A3 (en) 1981-04-22

Family

ID=11307558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80830027A Withdrawn EP0019597A3 (en) 1979-05-18 1980-05-06 Safety device for hydraulic circuits

Country Status (2)

Country Link
EP (1) EP0019597A3 (en)
IT (1) IT1118648B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE442765B (en) * 1982-02-18 1986-01-27 Atlas Copco Ab LAST pouring VALVE
JPH01133503U (en) * 1988-03-03 1989-09-12
JPH0473410A (en) * 1990-07-13 1992-03-09 Kosumetsuku:Kk Pressure oil supply/discharge circuit having residual pressure holding function and residual pressure holding valve device adopted to same
DE20314232U1 (en) * 2003-08-27 2004-10-21 Bucher Hydraulics Ag, Neuheim Hydraulically controlled valve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164171A (en) * 1961-01-30 1965-01-05 Clark Equipment Co Directional control valve
US3500721A (en) * 1968-07-23 1970-03-17 Eaton Yale & Towne Hydraulic control for two hydraulic motors
DE2209506A1 (en) * 1972-02-29 1974-01-24 Montan Hydraulik Gmbh & Co Kg DEVICE FOR CONTROLLING HYDRO DRIVES UNDER LOAD
FR2231910A1 (en) * 1973-06-04 1974-12-27 Griffet Ets M Control valve for hydraulic jack of crane jib - has piston operated by low pressure oil to control main oil flow
DE2424973A1 (en) * 1974-05-22 1975-12-04 Montan Hydraulik Gmbh & Co Kg Hydraulic drive control - has sealing valve, consisting of pilot and return valve
FR2312676A1 (en) * 1975-05-27 1976-12-24 Caterpillar Tractor Co HYDRAULIC LOAD ELEVATION SYSTEM

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164171A (en) * 1961-01-30 1965-01-05 Clark Equipment Co Directional control valve
US3500721A (en) * 1968-07-23 1970-03-17 Eaton Yale & Towne Hydraulic control for two hydraulic motors
DE2209506A1 (en) * 1972-02-29 1974-01-24 Montan Hydraulik Gmbh & Co Kg DEVICE FOR CONTROLLING HYDRO DRIVES UNDER LOAD
FR2231910A1 (en) * 1973-06-04 1974-12-27 Griffet Ets M Control valve for hydraulic jack of crane jib - has piston operated by low pressure oil to control main oil flow
DE2424973A1 (en) * 1974-05-22 1975-12-04 Montan Hydraulik Gmbh & Co Kg Hydraulic drive control - has sealing valve, consisting of pilot and return valve
FR2312676A1 (en) * 1975-05-27 1976-12-24 Caterpillar Tractor Co HYDRAULIC LOAD ELEVATION SYSTEM
US4000683A (en) * 1975-05-27 1977-01-04 Caterpillar Tractor Co. Hydraulic load lifting system

Also Published As

Publication number Publication date
IT1118648B (en) 1986-03-03
EP0019597A2 (en) 1980-11-26
IT7968061A0 (en) 1979-05-18

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

PUAL Search report despatched

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19820325

RIN1 Information on inventor provided before grant (corrected)

Inventor name: CINOTTO, GIUSEPPE