US3384336A - Shutoff devices for flexible delivery tubes - Google Patents

Shutoff devices for flexible delivery tubes Download PDF

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US3384336A
US3384336A US263161A US26316163A US3384336A US 3384336 A US3384336 A US 3384336A US 263161 A US263161 A US 263161A US 26316163 A US26316163 A US 26316163A US 3384336 A US3384336 A US 3384336A
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lever
tube
box
shutoff
preloaded spring
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US263161A
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Pulman Prockter Thomas
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RAINBOW VALVE CO Ltd
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RAINBOW VALVE CO Ltd
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    • 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
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/02—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm
    • F16K7/04—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force
    • F16K7/06—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with tubular diaphragm constrictable by external radial force by means of a screw-spindle, cam, or other mechanical means
    • F16K7/063—Lever clamps

Definitions

  • FIGJ United States Patent 3,384,336 SHUTOFF DEVICES FOR FLEXIBLE DELIVERY TUBES Prockter Thomas Pulman, Norfolk, England, assignor to This invention relates to shutoff devices for use with flexible delivery tubes and is concerned with facilitating the mass production of such devices.
  • a shutoff device for use with a flexible delivery tube includes opposed anvil and preloaded spring surfaces between which the tube can be disposed, said surf-aces being arranged for relative displacement, in response to limited displacement of an operating member, between a neutral position in which a free flow can take place through the tube and a shutoff position in which the tube is squeezed between the surfaces under a reactive force exerted by said preloaded spring surface.
  • FIGURE 1 is a sectional elevation showing one form of shutoff device constructed in accordance with the invention and,
  • FIGURE 2 is a view similar to FIGURE 1 but showing an alternative form of the device.
  • a shutoff device of the invention incorporates a closed box-like outer casing 1 which is intended for mounting in an upright position and has a supply opening 2 in the upper wall which is extended through an externally screw-threaded boss 3. This boss 3 then serves to connect the opening 2 with a supply line, not shown. Similarly, an opening is formed in the lower wall through which a connector 4 for a delivery line is conveniently arranged to extend.
  • the supply opening 2 and the delivery connector 4 are connected within the box by a length of flexible tube 5.
  • the flexible tube length 5 could form part of a continuous feed line which is passed through the openings in the top and bottom of the box, or could form part of a flexible supply or delivery line which is continued into the box.
  • anvil surface 6 Extending lengthwise behind the flexible tube length 5 within the box is an anvil surface 6 which may be provided by suitably shaping the back wall 1a of the box.
  • This lever is fulcrumed at 9 within the box at the junction of the cross-member 7 and stem 8, and the stem is arranged to project through a slot 10 in the front wall 1b of the box.
  • the length of the slot in the front Wall of the box is such that the lever stem 8 is permitted only limited angular movement from a centre or neutral position as shown, before being stopped against one or the other of the ends of the slot 10.
  • a preloaded leaf spring 11 Carried on the front face of the cross-member 7 which is directed towards the flexible tube length 5 is a preloaded leaf spring 11.
  • This leaf spring is conveniently in the form of an elongated strip having a centre seating 3,3843% Patented May 21, 1968 which bears on the lever at the fulcrum, the arms of the leaf spring on each side of the seating being then arranged to diverge rearwardly away from the lever cross-member 7 and being returned at their extremities. To load the leaf spring, the arms thereof are then pressed further apart and the returned ends are retained under the opposite extremities of the lever cross-member 7.
  • a free flow of liquid or particulate material can take place through the flexible tube length 5 lying between the anvil and the preloaded spring surfaces, when the device is in a neutral position, -i.e. when the lever stem 8 projects approximately cent-rally from the slot as shown.
  • a through connection can thus be provided between supply and delivery lines connecting respectively with the top and bottom of the casing 1. If, however, the stem 8 is moved towards one or other of the slot ends, then the flexible tube length 5 is progressively squeezed off. Thus, for example, if the lever stem 8 is moved downwardly towards the bottom of the slot, the lower arm of the lever cross-member, together with the over-lying preloaded spring surface thereon, is moved towards the anvil surface and commences to squeeze the tube between the two surfaces.
  • the projecting lever stem 8 as described is normally intended to support a load and, to this end, may be provided with an adjustable rider 12 for load suspension.
  • a coil spring 13 is conveniently provided between the front wall 1b of the easing and the upper cross-member arm so that, when the load is equal to the force exerted by the coil spring, the lever stem is maintained in its neutral position with the flexible pipe length open to permit free flow therethrough. If then the load increases or decreases, the lever is angularly displaced in the appropriate direction to shut off the flexible pipe length.
  • the boxlike outer casing 1 has a modified flat back wall 10, the anvil surface being provided by the modified cross-member 7a of a T-shaped fulcrumed lever which again has a stem 8 and a fulcrum 9.
  • the preloaded spring surface is then disposed behind the flexible tube length 5 against the back of the casing.
  • Such spring-loaded spring surface may, for example, be provided as illustrated by the ends of a spring loop 14 the centre part of which seats against the back Wall 1c of the casing whilst the ends are returned over the centre part and tensioned to underlie a stop bar 15 disposed between the casing side walls behind the tube length 5 and opposite the lever fulcrum 9. If then the T-shaped operating lever is rocked in one direction or the other, one arm of the crossmember 7a will press against the flexible tube length which, in turn, will be squeezed against a returned end of the loop spring 14 so that the latter will move away from the stop bar 15. The flexible tube length 5 is then again subjected to the reassertive force of a preloaded spring surface which presses the tube against the anvil surface provided by the associated cross-member of the operating lever.
  • springs of different characteristics may be employed.
  • a shutoff device for use with a flexible delivery tube, said device comprising a box-like outer casing having a back wall forming an anvil surface disposed on one side of said tube, a preloaded spring surface disposed in facing relationship with said anvil surface on the opposite side of said tube, means for relatively displacing said surfaces between a neutral position in which free flow can take place through said tube, and a shutoff position in which said tube is squeezed under a reactive force exerted by said preloaded spring surface, and an operating member for effecting relative displacement of said surfaces, said operating member being in the form of a fulcrumed lever which is arranged for displacement about the fulcrum in one direction by an applied load and in the opposite direction by counterbalancing means, said operating lever being T-shaped and being fulcrumed at the head end Within said box-like outer casing, said operating lever having a stem part projecting between upper and lower stops to support the load, the permitted angular displacement of said lever about its fulcrum being limited by said stops, said preloaded spring surface being associated
  • a shutoff device as claimed in claim 1 in which said spring surfaces are provided by a tens ioned leaf spring having a centre seating on the centre of the lever cross-member and arms on each side of the seating which diverge rearwardly away from the cross-member and have returned ends which are retained behind the opposite arms of the cross-member, the said spring arms being operable alternatively to squeeze the flexible tube depending upon the direction of angular displacement of the lever.

Description

P. T. PUL.MAN 3,38 ,336
SHUTOFF DEVICES FOR FLEXIBLE DELIVERY TUBES May 21, 1968 Filed March 6, 1963 FIGJ United States Patent 3,384,336 SHUTOFF DEVICES FOR FLEXIBLE DELIVERY TUBES Prockter Thomas Pulman, Norfolk, England, assignor to This invention relates to shutoff devices for use with flexible delivery tubes and is concerned with facilitating the mass production of such devices.
According to the invention a shutoff device for use with a flexible delivery tube includes opposed anvil and preloaded spring surfaces between which the tube can be disposed, said surf-aces being arranged for relative displacement, in response to limited displacement of an operating member, between a neutral position in which a free flow can take place through the tube and a shutoff position in which the tube is squeezed between the surfaces under a reactive force exerted by said preloaded spring surface. By employing spring loading to squeeze the tube rather than direct pressure from a lever or the like, it is possible to ensure that the crushing load on the tube is kept with-in desired limits irrespective of manufacturing inaccuracies and tolerances in the size of tube to be controlled as well as in the parts of the device.
In order that the invention may be clearly understood and readily carried into effect, two embodiments thereof Will now be described in detail with reference to the accompanying drawing in Which FIGURE 1 is a sectional elevation showing one form of shutoff device constructed in accordance with the invention and,
FIGURE 2 is a view similar to FIGURE 1 but showing an alternative form of the device.
Referring now to the drawing, a shutoff device of the invention incorporates a closed box-like outer casing 1 which is intended for mounting in an upright position and has a supply opening 2 in the upper wall which is extended through an externally screw-threaded boss 3. This boss 3 then serves to connect the opening 2 with a supply line, not shown. Similarly, an opening is formed in the lower wall through which a connector 4 for a delivery line is conveniently arranged to extend. The supply opening 2 and the delivery connector 4 are connected within the box by a length of flexible tube 5. Alternatively, of course, the flexible tube length 5 could form part of a continuous feed line which is passed through the openings in the top and bottom of the box, or could form part of a flexible supply or delivery line which is continued into the box. Extending lengthwise behind the flexible tube length 5 within the box is an anvil surface 6 which may be provided by suitably shaping the back wall 1a of the box.
Also extending lengthwise of the tube length within the box, so as to lie in front of the tube length and opposite the anvil surface 6, is the cross-member 7 of a T-shaped operating member or lever having a stem 8. This lever is fulcrumed at 9 within the box at the junction of the cross-member 7 and stem 8, and the stem is arranged to project through a slot 10 in the front wall 1b of the box. The length of the slot in the front Wall of the box is such that the lever stem 8 is permitted only limited angular movement from a centre or neutral position as shown, before being stopped against one or the other of the ends of the slot 10.
Carried on the front face of the cross-member 7 which is directed towards the flexible tube length 5 is a preloaded leaf spring 11. This leaf spring is conveniently in the form of an elongated strip having a centre seating 3,3843% Patented May 21, 1968 which bears on the lever at the fulcrum, the arms of the leaf spring on each side of the seating being then arranged to diverge rearwardly away from the lever cross-member 7 and being returned at their extremities. To load the leaf spring, the arms thereof are then pressed further apart and the returned ends are retained under the opposite extremities of the lever cross-member 7.
With the arrangement described, a free flow of liquid or particulate material can take place through the flexible tube length 5 lying between the anvil and the preloaded spring surfaces, when the device is in a neutral position, -i.e. when the lever stem 8 projects approximately cent-rally from the slot as shown. A through connection can thus be provided between supply and delivery lines connecting respectively with the top and bottom of the casing 1. If, however, the stem 8 is moved towards one or other of the slot ends, then the flexible tube length 5 is progressively squeezed off. Thus, for example, if the lever stem 8 is moved downwardly towards the bottom of the slot, the lower arm of the lever cross-member, together with the over-lying preloaded spring surface thereon, is moved towards the anvil surface and commences to squeeze the tube between the two surfaces. By the time the lever stem has reached its limiting position at the bottom of the slot 10, the lower arm of the cross-member will have moved slightly away from the returned lower end of the leaf spring 11 and the flexible tube will be squeezed against the anvil surface 6 under the reactive force exerted by the leaf spring. Exactly the same shutoff procedure will take place if the lever stem is moved towards the upper end of the slot 10, the upper arm of the cross-member and the upper part of the preloaded leaf spring then becoming operative.
The projecting lever stem 8 as described is normally intended to support a load and, to this end, may be provided with an adjustable rider 12 for load suspension. To counterbalance the load, a coil spring 13 is conveniently provided between the front wall 1b of the easing and the upper cross-member arm so that, when the load is equal to the force exerted by the coil spring, the lever stem is maintained in its neutral position with the flexible pipe length open to permit free flow therethrough. If then the load increases or decreases, the lever is angularly displaced in the appropriate direction to shut off the flexible pipe length. In the event that the load increases excessively, however, it will be observed that this will not result in the application of an undue crushing force against the flexible tube length, since such force will be limited to the reactive force exerted by the operative end of the leaf spring. Equally, if the flexible tube length has been made oversize, as a result of manufacturing inaccuracy, the crushing force thereon is automatically maintained within permitted limits without individual adjustment.
In the alternative embodiment of the invention illustrated in FIGURE 2, parts which are similar to those in the embodiment of FIGURE 1 are given the same reference numerals. In this further embodiment, the boxlike outer casing 1 has a modified flat back wall 10, the anvil surface being provided by the modified cross-member 7a of a T-shaped fulcrumed lever which again has a stem 8 and a fulcrum 9. The preloaded spring surface is then disposed behind the flexible tube length 5 against the back of the casing. Such spring-loaded spring surface may, for example, be provided as illustrated by the ends of a spring loop 14 the centre part of which seats against the back Wall 1c of the casing whilst the ends are returned over the centre part and tensioned to underlie a stop bar 15 disposed between the casing side walls behind the tube length 5 and opposite the lever fulcrum 9. If then the T-shaped operating lever is rocked in one direction or the other, one arm of the crossmember 7a will press against the flexible tube length which, in turn, will be squeezed against a returned end of the loop spring 14 so that the latter will move away from the stop bar 15. The flexible tube length 5 is then again subjected to the reassertive force of a preloaded spring surface which presses the tube against the anvil surface provided by the associated cross-member of the operating lever.
In the foregoing, two typical embodiments of the invention have been described and illustrated, but it will be appreciated that various alternative arrangements for squeezing a flexible tube length between the anvil and a spring surface may also be employed.
To vary the closing pressures exerted by the device of the invention in any of the described embodiments, springs of different characteristics may be employed.
I claim:
1. A shutoff device for use with a flexible delivery tube, said device comprising a box-like outer casing having a back wall forming an anvil surface disposed on one side of said tube, a preloaded spring surface disposed in facing relationship with said anvil surface on the opposite side of said tube, means for relatively displacing said surfaces between a neutral position in which free flow can take place through said tube, and a shutoff position in which said tube is squeezed under a reactive force exerted by said preloaded spring surface, and an operating member for effecting relative displacement of said surfaces, said operating member being in the form of a fulcrumed lever which is arranged for displacement about the fulcrum in one direction by an applied load and in the opposite direction by counterbalancing means, said operating lever being T-shaped and being fulcrumed at the head end Within said box-like outer casing, said operating lever having a stem part projecting between upper and lower stops to support the load, the permitted angular displacement of said lever about its fulcrum being limited by said stops, said preloaded spring surface being associated with each arm of the lever cross member, said spring surfaces being arranged to cooperate alternatively with said anvil surface depending upon the direction of angular displacement of said operating lever and said flexible tube being extended lengthwise of the cross member at the head end of the lever and between the said cross member and said back wall of the casing to connect supply and delivery openings provided respectively in the top and bottom of the casing.
2. A shutoff device as claimed in claim 1 in which said spring surfaces are provided by a tens ioned leaf spring having a centre seating on the centre of the lever cross-member and arms on each side of the seating which diverge rearwardly away from the cross-member and have returned ends which are retained behind the opposite arms of the cross-member, the said spring arms being operable alternatively to squeeze the flexible tube depending upon the direction of angular displacement of the lever.
References Cited UNITED STATES PATENTS 682,279 9/1901 Bade 251-7 X 1,190,039 7/1916 Tatum 251-10 1,432,882 10/1922 Lobl M 251-6 2,872,078 2/ 1959 Kennedy 25 l-7 X 3,054,425 9/1962 Pribonic 25l9 X 2,010,229 8/1935 Goff et al 25l9 XR 2,895,653 7/1959 Giepen 25l9 XR 3,105,745 10/1963 Vieli 25l9 XR FOREIGN PATENTS 83,421 10/ 1895 Germany. 103,930 2/1917 Great Britain. 462,057 3/1937 Great Britain.
WILLIAM F. ODEA, Primary Examiner. R. GERARD, Assistant Examiner.

Claims (1)

1. A SHUTOFF DEVICE FOR USE WITH A FLEXIBLE DELIVERY TUBE, SAID DEVICE COMPRISING A BOX-LIKE OUTER CASING HAVING A BACK WALL FORMING AN ANVIL SURFACE DISPOSED ON ONE SIDE OF SAID TUBE, A PRELOADED SPRING SURFACE DISPOSED IN FACING RELATIONSHIP WITH SAID ANVIL SURFACE ON THE OPPOSITE SIDE OF SAID TUBE, MEANS FOR RELATIVELY DISPLACING SAID SURFACE BETWEEN A NEUTRAL POSITION IN WHICH FREE FLOW CAN TAKE PLACE THROUGH SAID TUBE, AND A SHUTOFF POSITION IN WHICH SAID TUBE IS SQUEEZED UNDER A REACTIVE FORCE EXERTED BY SAID PRELOADED SPRING SURFACE, AND AN OPERATING MEMBER FOR EFFECTING RELATIVE DISPLACEMENT OF SAID SURFACES, SAID OPERATING MEMBER BEING IN THE FORM OF A FULCRUMED LEVER WHICH IS ARRANGED FOR DISPLACEMENT ABOUT THE FULCRUM IN ONE DIRECTION BY AN APPLIED LOAD AND IN THE OPPOSITE DIRECTION BY COUNTERBALANCING MEANS, SAID OPERATING LEVER BEING T-SHAPED AND BEING FULCRUMED AT THE HEAD END WITHIN SAID BOX-LIKE OUTER CASING, SAID OPERATING LEVER HAVING A STEM PART PROJECTING BETWEEN UPPER AND LOWER STOPS TO SUPPORT THE LOAD, THE PERMITTED ANGULAR DISPLACEMENT OF SAID LEVER ABOUT ITS FULCRUM BEING LIMITED BY SAID STOPS, SAID PRELOADED SPRING SURFACE BEING ASSOCIATED WITH EACH ARM OF THE LEVER CROSS
US263161A 1962-03-26 1963-03-06 Shutoff devices for flexible delivery tubes Expired - Lifetime US3384336A (en)

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GB11476/62A GB977818A (en) 1962-03-26 1962-03-26 Improvements relating to shut-off devices for use with flexible delivery tubes

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US4286618A (en) * 1980-05-09 1981-09-01 Korus, Inc. Valve
US4643389A (en) * 1984-12-27 1987-02-17 American Hospital Supply Corporation Tubing occlusion clip
US4807845A (en) * 1987-09-30 1989-02-28 Kardiothor, Inc. Tube valve
US5078362A (en) * 1990-03-15 1992-01-07 Abbott Laboratories Spring-biased valve for use in a positive displacement volumetic pump
US5402823A (en) * 1992-12-07 1995-04-04 George S. Cole & Associates, Incorporated Pinch valve
WO2011136667A1 (en) * 2010-04-30 2011-11-03 Raymond John Avery Flow control system
US20130118619A1 (en) * 2010-06-02 2013-05-16 Technische Universität Berlin Valve device for controlling a flow of a fluid through a fluid channel, arrangement and multi-way valve device
US9151646B2 (en) 2011-12-21 2015-10-06 Deka Products Limited Partnership System, method, and apparatus for monitoring, regulating, or controlling fluid flow
USD745661S1 (en) 2013-11-06 2015-12-15 Deka Products Limited Partnership Apparatus to control fluid flow through a tube
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Publication number Priority date Publication date Assignee Title
US4286618A (en) * 1980-05-09 1981-09-01 Korus, Inc. Valve
US4643389A (en) * 1984-12-27 1987-02-17 American Hospital Supply Corporation Tubing occlusion clip
US4807845A (en) * 1987-09-30 1989-02-28 Kardiothor, Inc. Tube valve
US5078362A (en) * 1990-03-15 1992-01-07 Abbott Laboratories Spring-biased valve for use in a positive displacement volumetic pump
US5402823A (en) * 1992-12-07 1995-04-04 George S. Cole & Associates, Incorporated Pinch valve
WO2011136667A1 (en) * 2010-04-30 2011-11-03 Raymond John Avery Flow control system
US20130118619A1 (en) * 2010-06-02 2013-05-16 Technische Universität Berlin Valve device for controlling a flow of a fluid through a fluid channel, arrangement and multi-way valve device
US9067051B2 (en) * 2010-06-02 2015-06-30 Technische Universitat Berlin Valve device for controlling a flow of a fluid through a fluid channel, arrangement and multi-way valve device
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Publication number Publication date
GB977818A (en) 1964-12-16
DE1425693B2 (en) 1970-04-23
DE1425693A1 (en) 1968-10-24

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