US3664374A - Bistable pneumatic flip flop apparatus - Google Patents

Bistable pneumatic flip flop apparatus Download PDF

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Publication number
US3664374A
US3664374A US3664374DA US3664374A US 3664374 A US3664374 A US 3664374A US 3664374D A US3664374D A US 3664374DA US 3664374 A US3664374 A US 3664374A
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US
United States
Prior art keywords
piston
cylinders
shuttle
valve
valves
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 - Lifetime
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English (en)
Inventor
John D Reid
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Hamilton Co Inc
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Hamilton Co Inc
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Publication date
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Publication of US3664374A publication Critical patent/US3664374A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • 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
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87233—Biased exhaust valve
    • Y10T137/87241—Biased closed

Definitions

  • the control valve may be manually or automatically controlled.
  • FIG. I is a schematic sectional view of a pressure control valve embodying the present invention.
  • FIG. 2 is an end view of the valve assembly
  • FIG. 3 is a sectional view taken on line 33 of FIG. 2;
  • FIG. 4 is a sectional view taken on line 4-4 of FIG. 3.
  • FIG. 5 is a sectional view taken on line 55 of FIG. 3;
  • FIG. 6 is a side elevational view of the pressure control valve operably connected with an actuator having a reciprocating piston, the valve being controlled in one part of its cycle of operation by the piston of the actuator;
  • FIG. 7 is a similar view of an alternative arrangement.
  • a pressure control valve embodying the present invention having a valve body 10 with shuttle cylinders 12 and 14 at each side separated by a partition or partition wall 16.
  • Shuttle cylinders 12 and 14 are axially aligned and their inner ends are connected together by an axial bore 18.
  • an air supply passage having one end connected to the bore 18 intermediate the ends of said bore andadapted to be connected with a source of air under pressure, not shown, by means of a conduit 22.
  • Velocity adjustment means is provided for the passages 24 and 26, and as shown said velocity adjustment means comprises respective tapered velocity adjustment valves 35 which are operably disposed in similarly tapered bores 35a. At their outer ends the valves 35 are externally threaded, as at 35b, for threadable disposition in tapped outer end parts of said bores 35a. Adjustment valves 35 have inner end portions that extend across the passages 24 and 26 and the outer ends of said velocity adjustment valves have slots 35c for reception of tools for rotating said valves 35 to vary the effective size of said passages 24 and 26. 7
  • This pressure relief means comprises normally closed vent valves, indicated generally at 40 and 42, respectively, at the ends of vent conduits 44 and 46 which have ends connected with said vent passage, the valves 40 and 42 being at the outer ends of said conduits.
  • Vent valves 40 and 42 have valve members 48 and 50 with respective valve stems 52 and 54, said valve members 48 and 50 seat on valve seats 56 and 58, respectively, and said valves are yieldingly urged closed by means of springs 60 provided therefor and which react between the bottom walls of respective spring retaining recesses and respective spring retainers 62 at the free ends of the valve stems 52 and 54. While the vent valves 40 and 42 are shown at the ends of the vent conduits 44 and 46, it is to be understood that said valves may be at the ends of the vent passages 36 and 38, or otherwise operably located. It is also to be understood that other types of relief valves may be used, such as tire valves 66, for example, as shown in FIG. 3.
  • Shuttle cylinders 12 and 14 have respective pistons 70 and 72 of a shuttle, indicated generally at 74, said pistons being of a plastic or other suitable material, such as aluminum, stainless steel or the like, and said pistons being connected together by a shuttle rod 76, which is operably disposed in the bore 18 and is somewhat smaller in diameter than said bore. End portions of said shuttle rod are threaded, as at 78, and threadably disposed in tapped bores provided therefor in the inner ends of the respective pistons.
  • each of the threaded portions 78 there is a shoulder against which the inner ends of the shuttle pistons seat so that the pistons are spaced apart at a predetermined distance, which is greater than the thickness of the wall 16, so that when the inner end of one shuttle piston engages or seats against the adjacent side of said wall 16 the inner end of the other piston is spaced from the adjacent side of said wall 16, as best shown in FIGS. 1 and 2.
  • the shuttle pistons At their inner ends the shuttle pistons have reduced diameter parts 80 and 82 to provide annular areas 84 and 86, respectively, for the flow of air when the shuttle pistons are seated against the respective adjacent sides of the wall 16, said areas then communicating with the respective passages 24 and 26, as well as the respective passages 36 and 38.
  • annular piston seals or rings 88 disposed in annular grooves provided therefor in the shuttle pistons 70 and 72. These piston seals may be O-rings of well known character.
  • Shuttle pistons have bores 90 and 92 which extend inwardly from their outer ends. These bores are offset from the axis of the respective shuttle pistons and extend but part way through said pistons, the inner-ends of said bores being tapered inwardly to provide valve seats for piston valves 94 and 96 for the respective shuttle pistons 70 and 72, said valve seats being in walls at the inner ends of said bores 90 and 92.
  • the piston or pressure relief valves 94 and 96 have' valve stems 104 and 106, respectively, which extend through the axial openings in the walls at the outer and inner ends of said chambers 100 and 102, said openings in said wallsbeing of somewhat greater diameter than the diameter of said valve stems so that air may pass through said openings and into the bores 90 and 92 and, hence, to the atmosphere. In other words, there are atmospheric vents which are controlled by said piston valves 94 and 96.
  • each valve stem Secured on each valve stem is a flange or washer 108, or the like, and there is a spring 110 and 1 12 on the valve stems 104 and 106 reacting between said flange 108 and the walls defining the outer ends of respective chambers 100 and 102 for yieldingly urging the piston valves closed.
  • valve stems 104 and 106 are closely adjacent to the wall 16 separating the cylinders and 14, but said inner ends of said valve stems are slightly spaced from said wall 16.
  • the stem of its valve engages wall 16 and, upon further inward movement of said piston, the valve of said piston is opened. While said piston moves inwardly, there is venting of air from the pressurized side of the system, as described hereinafter.
  • a pneumatic actuator indicated generally at 120, which includes the air cylinder 30 in which a reciprocating actuator piston 31 operates, said piston having a piston rod 122.
  • the present pressure control valve When the present pressure control valve is connected to the cylinder 30 and to a source of air under pressure, it controls the pressurizing and venting of the ports of the air cylinder 30 in appropriate sequence, it being assumed that the arm 125 on piston rod 122 is not used. 7
  • air under pressure pressurizes one or the other of the ports at the ends of the air cylinder 30.
  • the shuttle piston 74 is in its leftward operating position, its vent valve being closed.
  • vent valve 40 To reverse the direction of movement of the piston 31 in the cylinder 30 it is necessary to vent the pressurized side. This is effected by opening the vent valve 40. As shown in Flg. 1, the vent valves 40 and 42 are actuated manually, although one or the other or both may be actuated automatically.
  • the piston valve 96 closes allowing the upper end of the cylinder to be pressurized, air below actuator piston 31 in said cylinder 30 being vented to the atmosphere.
  • the piston 31 in cylinder 30 reaches its lower limit of movement it stops.
  • the arm or traveling block is secured on the piston rod 122 and is adapted to open the vent valve 42 when said piston in cylinder 30 reaches the end of its downward movement, thus automatically initiating the upward part of its cycle. When it reaches the upper end of its movement said piston stops. With this arrangement one full cycle is effected each time the push-button 126 at the free end of the valve stem 52 of the vent valve 40 is pushed or actuated.
  • the arm or block 125 is secured to the piston rod 122 between the vent valves 40 and 42 which are spaced apart and so positioned that the arm 125 will engage the respective vent valves to alternately open same when the piston 31 comes to the lower and upper ends of its stroke.
  • the cycling of the actuator is started it will automatically continue until the source of pressure air is shut off by means of a valve, not shown.
  • the pressure air is supplied to the pressure control valve the cycling is started or resumed and automatically continued.
  • a pressure control valve comprising:
  • a body having axially aligned, oppositely arranged cylinders therein;
  • each cylinder being adapted to be operably connected with a source of actuating fluid under pressure, each cylinder also having a vent fluid passage connection;
  • a shuttle comprising:
  • pistons in respective cylinders rigid means extending through the .bore in said partition whereby said pistons have simultaneous movement in said cylinders and whereby as one piston moves outwardly, the other piston moves inwardly in the respective cylinders, said shuttle having a centered position whereat the respective pistons thereof are equally spaced from the inner ends of their respective cylinders;
  • each of said piston valves having a part for engagement with said piston when said piston moves inwardly of its cylinder beyond its position when the shuttle is centered for opening such valve the other piston valve being closed with such outward movement of the other piston, such shuttle being actuated by a differential of pressures on the pistons thereof.
  • a pressure control valve comprising:
  • a body having axially aligned, oppositely arranged cylinders therein;
  • a partition between said cylinders and having a bore therethrough axially aligned with said cylinders, said bore having a passage adapted to be connected with a source of air under pressure, the inner ends of said cylinders having passages adapted to be connected with a source of actuating air under pressure;
  • a shuttle comprising:
  • each of said pistons having a pressure relief connection between the inner end thereof and the outer end;
  • pressure relief piston valves controlling respective relief connections
  • said pressure relief piston valves being yieldingly urged in the closing direction and having valve stems extending from the inner ends of said pistons, the inner free ends of said stems abutting the adjacent side of the partition upon inward movement of respective pistons inwardly of a centered position of the shuttle for opening the respective pressure relief piston valves;
  • vent valves for venting respective vent passages.
  • a pressure control valve comprising:
  • a body having axially aligned, oppositely arranged cylinders therein;
  • a partition having a bore therethrough axially aligned with said cylinders, the inner ends of said cylinders being connected together by said axial bore through said partition, the inner end of each cylinder being connected with an actuating air supply passage adapted to be connected to a device having a reciprocating member whereby respective sides of said member may be subjected to actuating pressure and respective sides vented, said inner ends of said cylinders also having vent passages;
  • a shuttle piston operably disposed in each of said cylinders, said shuttle having a centered position and movable in both directions therefrom;
  • each piston relief valve means being opened by action of its respective piston when its respective piston moves inwardly beyond the centered position of said shuttle.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)
  • Safety Valves (AREA)
  • Control Of Fluid Pressure (AREA)
US3664374D 1970-06-16 1970-06-16 Bistable pneumatic flip flop apparatus Expired - Lifetime US3664374A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4669170A 1970-06-16 1970-06-16

Publications (1)

Publication Number Publication Date
US3664374A true US3664374A (en) 1972-05-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US3664374D Expired - Lifetime US3664374A (en) 1970-06-16 1970-06-16 Bistable pneumatic flip flop apparatus

Country Status (2)

Country Link
US (1) US3664374A (enExample)
JP (2) JPS5119173B1 (enExample)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674266A (en) * 1948-09-09 1954-04-06 Lawrence H Gardner Supply and exhaust valve for servomotors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674266A (en) * 1948-09-09 1954-04-06 Lawrence H Gardner Supply and exhaust valve for servomotors

Also Published As

Publication number Publication date
JPS5119173B1 (enExample) 1976-06-15
JPS4912287A (enExample) 1974-02-02

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