EP0079627B1 - Device for the sequential operation of controlled members - Google Patents

Device for the sequential operation of controlled members Download PDF

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Publication number
EP0079627B1
EP0079627B1 EP82201276A EP82201276A EP0079627B1 EP 0079627 B1 EP0079627 B1 EP 0079627B1 EP 82201276 A EP82201276 A EP 82201276A EP 82201276 A EP82201276 A EP 82201276A EP 0079627 B1 EP0079627 B1 EP 0079627B1
Authority
EP
European Patent Office
Prior art keywords
piston
valve
cut
closure member
controlled
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
EP82201276A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0079627A3 (en
EP0079627A2 (en
Inventor
Giorgio Bormioli
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
Publication of EP0079627A2 publication Critical patent/EP0079627A2/en
Publication of EP0079627A3 publication Critical patent/EP0079627A3/en
Application granted granted Critical
Publication of EP0079627B1 publication Critical patent/EP0079627B1/en
Expired 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

Definitions

  • the present invention relates to a device for the sequential operation of controlled members.
  • the present invention relates to a device which is able to provide sequentially the closing of the check-valves and the operation of the release device in a pipe fitting of the kind, known per se, realized in two separable parts everyone provided with a check-valve.
  • this is done by a device in which a piston sliding in a cylinder causes in a first part of advancement run the integral closing of the two check-valves and in a second and last part the opening of a cut-off valve intended for the control of a fluid flow destined for control of the release device.
  • the object of the present invention is therefore to realize a sequential operating device of the above-mentioned kind, particularly but not only for pipe fittings, which is exempt from the above explained drawback and, more precisely, assures in any case the closing of the cut-off valve in occasion of the piston return movement from the valve opening position.
  • the device comprising a piston sliding in a cylinder for the corresponding operation of a first controlled member and a cut-off valve intended for the control of a fluid flow destined for the operation of a second controlled member, said cut-off valve being provided with a closure member connected to a sliding control member situated in front of said piston, characterized in that said piston is provided with a head portion releasably connectable to said sliding control member of the closure member and there are provided interlocking means for said head portion and said sliding control member, which means allow the piston to become coupled with the closure member of the cut-off valve in proximity of the end of every advancement stroke of the piston towards said cut-off valve and to become uncoupled at a predetermined point of the successive return stroke of the same piston.
  • the functional connection between the piston and the closure member of the cut-off valve is now constituted by a releasable connection, which, remaining unreleased in the final part of the piston advancement stroke and in the initial part of its return stroke, allows the piston to control not only the opening but also the closing of the cut-off valve, which the piston subsequently leaves in that position so as to be able to complete its return stroke. It is therefore impossible that the cut-off valve remains inappropriately open and, on the contary, it is certain that it always closes when due, thus allowing the sure repetition of the wanted sequence.
  • the device illustrated in the drawings substantially comprises a piston 1 sliding in a hydraulic cylinder 2 and a cut-off valve 3 provided with a sliding closure member 4 situated coaxially in front of the piston 1.
  • a stem or rod 5 which in a known way provides for the operation of a first controlled member, for example for the opening (by advancing from right to left) and for the closing (by returning from left to right) of the two check valves of a pipe fitting of the above described kind.
  • a first controlled member for example for the opening (by advancing from right to left) and for the closing (by returning from left to right) of the two check valves of a pipe fitting of the above described kind.
  • To the movements of the piston 1 provides in an usual manner oil fed from time to time on the right or on the left of the piston in the cylinder 2.
  • a head portion 6 which includes an axial appendix 7 provided with an annular groove 8.
  • said axial appendix 7 is held in a large axial passage 9 of the front wall of the cylinder 2.
  • Said passage 9 includes at its inner end a flaring 10, whose objects will be clarified later on.
  • the cut-off valve 3 includes in its turn an outer casing or valve body 11, through which extends a passage formed by two parallel end portions 12 and 13 and by a perpendicular intermediate portion 14. Through said passage 9 an oil flow fed into the end portion 12 can provide for the operation of a second controlled member, for example the release device of a pipe fitting of the above described kind.
  • a spring 15 stresses the closure member 4 towards the closed position, whose movements are however subjected to the control of the piston 1, as it will be seen better later on, as a result of the releasable connection, which can be realized, when wanted, between a sliding control bar 16 situated as an extension of the closure member 4 and passing through the axial passage of the front wall of the cylinder 2.
  • the control bar 16 is provided with a hollow end portion 17 in which said axial appendix 7 of the piston 1 can be slidingly inserted.
  • the above mentioned hollow portion 17 is provided on the other hand with radial holes 18, in which there are slidingly housed the same number of balls 19, which project partially inside and partially outside the hollow portion 17 so as to be able to insert, when wanted, in the annular groove 8 of the axial appendix 7 of the piston 1 and at the same time to be guided, outside, by the wall of the axial passage 9.
  • Said passage 20 has the function to allow a return oil flow from the second controlled member while the closure member 4 is in closed position.
  • the device illustrated in the drawings is made working by feeding oil simultaneously into the cylinder 2 on the right of the piston 1 and into the end portion 12 of the inner passage of the cutoff valve 3.
  • the piston 1 begins then to move towards left, operating with its stem 5 the first controlled member (in the considered example, thus causing the closing of the check valves), while the closed position of the closure member 4 of the cut-off valve 3 prevents the oil fed in the duct section 2 from reaching the duct section 13 and therefore the second controlled member (in the considered example, the control of the release device), which therefore remains at rest.
  • the situation is illustrated in Fig. 3.
  • the two controlled members are so operated in the desired sequence, which is destined to be repeated every time in the same way.
  • the balls 19 are at the flaring 10 of the axial passage 9, which allows their partial coming out under the push given by the axial appendix 7 being coming back. So they can disengage from the annular groove 8 of the same appendix and, leaving free the latter, can allow the separation of the piston 1 from the closure member 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
EP82201276A 1981-11-18 1982-10-14 Device for the sequential operation of controlled members Expired EP0079627B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2515081 1981-11-18
IT25150/81A IT1139785B (it) 1981-11-18 1981-11-18 Dispositivo per l'azionamento sequinziale di organi comandati

Publications (3)

Publication Number Publication Date
EP0079627A2 EP0079627A2 (en) 1983-05-25
EP0079627A3 EP0079627A3 (en) 1984-07-18
EP0079627B1 true EP0079627B1 (en) 1986-10-15

Family

ID=11215856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201276A Expired EP0079627B1 (en) 1981-11-18 1982-10-14 Device for the sequential operation of controlled members

Country Status (3)

Country Link
EP (1) EP0079627B1 (it)
DE (1) DE3273826D1 (it)
IT (1) IT1139785B (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501346A (en) * 1991-11-11 1996-03-26 Palfinger Aktiengesellschaft Multistage telescope boom
AT398304B (de) * 1991-11-11 1994-11-25 Palfinger Ag Mehrstufiger teleskopausleger

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101030A (en) * 1961-09-01 1963-08-20 Aro Corp Valve for pneumatic motors
DE1634967A1 (de) * 1965-08-09 1970-07-23 Erich Sennebogen Vorrichtung zum Steuern einer hydraulisch betaetigten Greif- oder Schuerfeinrichtung
US3530896A (en) * 1968-04-25 1970-09-29 Whiteman Marvin E Hydraulic power actuator and pilot valve unit assembly
FR2248460B1 (it) * 1973-10-19 1980-12-05 Deutsch Co
DE2653976C2 (de) * 1976-11-27 1985-12-05 Carl Kurt Walther Gmbh & Co Kg, 5600 Wuppertal Schnellkupplung

Also Published As

Publication number Publication date
EP0079627A3 (en) 1984-07-18
IT8125150A0 (it) 1981-11-18
IT1139785B (it) 1986-09-24
DE3273826D1 (en) 1986-11-20
EP0079627A2 (en) 1983-05-25

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