US2402036A

US2402036A - Liquid delivery device

Info

Publication number: US2402036A
Authority: US
Inventors: Giger Ernst
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-11-04
Filing date: 1942-04-22
Publication date: 1946-06-11
Anticipated expiration: 1963-06-11

Description

June 11; 1946. G|GER 2,402,036

LIQUID DELIVERY DEvIcE Filed April 22, 1942 4 Sheets-Sheet 1 III/I June 11,1946.

E. GIGER LIQUID DELIVERY DEVICE Filed April 22, 1942 4 Sheets-Sheet 2 June 11, 1946. E. GIGER 2,402,036

' LIQUID DELIVERY DEVICE Filed April 22, 1942 4 Sheets-Sheet 3 X/I/A June 11, 1946. E. GIGER 2,402,036

LIQUID DELIVERY DEVICE Filed April 22, 1942 4 Sheets-Sheet 4 Patented June 11, 1946 UNH'E LIQUID DELIVERY DEVICE Zurich), Switzerland Application April 22, 1942, Serial No. 440,004 In Switzerland November 4, 1941 6 Claims.

The invention relates to improvements in liquid dispensing devices.

It is an object of the invention to provide a device for delivering liquids into a container and to automatically interrupt the delivery when the level of the liquid in the container has reached a certain height.

Another object of the invention is to provide a liquid dispensing device in which an automatic shut-on" for the delivery is under control of negative pressure created by the flow of the liquid into the container and becoming effective when the level in the container is high enough to constitute a seal for an air supply tube.

It is also an object of the invention to provide a liquid dispensing device in which the flow of the liquid through the device is controllable by an operator in accordance with the selectively determined movement of a valve from its seat, thereby enabling the operator to permit the liquid to be dispensed to flow more or less rapidly through the device.

It is another object of the invention to provide a liquid dispensing device with an automatic shut-off in which the shut-off normally is released from the valve, and in which a coupling of the shut-01f with the valve mechanism can be effected selectively by the operator, so that the operator, after this coupling, may adjust the valve to permit the flow of liquid therethrough.

It is, furthermore, an object of the invention to provide a dispensing device of the character described in which the automatic shut-off automatically is uncoupled from the valve mechanism when the level in the liquid container has reached a certain height, and at the same time also restore the valve to its closing position.

With these and numerous other objects in view, various embodiments of the invention are illustrated in the accompanying drawings to which reference is made in the following specification.

In the drawings:

Fig. 1 shows a vertical central section through one embodiment of the dispensing device;

Figs. 3 and 4 are similar sectional views through modifications respectively of the liquid dispensing device, and

Fig. 5 is a fragmentary horizontal sectional view on line 5-5 of Fig. 3 through an assembly of details in the embodiment illustrated in Fig. 3.

With reference to the liquid dispensing device illustrated in Fig. 1, it will be seen that the casing I of the dispensing device is provided with a lateral extension 2 to which a hose or pipe leading to a source of liquid under pressure, not shown, may be connected. A lower chamber in the easing I receives the valve 4 which is seated on the upper annular surface of a valve seat ring 3 inserted into an opening in the lower wall of the casing. The valve seat 3 is held in position against an inwardly projecting shoulder 5 of the casing by means of a flange 5 on the valve seat, said flange being forced against the shoulder by the upper end of a delivery stud I forming a downward extension of the casing and held in position on the casing by the threaded and flanged ring 8.

Within the liquid chamber of the casin in which the valve 4 is disposed, there is also provided a resiliently expansible and contractible metal tube or Sylphon 9 having a head 9a which rests upon a shoulder Ia projecting inwardly from the circumferential wail of the casing. A plate l E disposed above the head of the Sylphon has a tubular guide Iia projecting downwardly for the stem of the valve 4. This plate I I also is provided with a cylindrical flange I2 projecting in the opposit-e direction from the guide Na and having a considerably greater diameter than the tubular guide which projects downwardly from the plate H.

A helical spring I0 is interposed between the head !i of the tubular guide Na and the valve 3, said spring surrounding the tubular guide and exerting normally a pressure against the valve 4 to hold the same on the seating surface of the valve ring 3.

The delivery stud i which is secured in the lower extension of the casing I by means of the threaded ring 8 is provided with a horizontal partition wall l3 having a plurality of openings 53a through which the liquid may flow when the valve 4 is lifted from its seat. The flow of liquid is continued through a discharge pipe or hose i4 into the container to be supplied with liquid. A central boss i311 rising from the partition I3 has an axial bore itc opening into the space below the valve 4 and being extended downwardly from the partition wall to communicate with a chamber :5 formed between the downward extension of the partition wall and a central additional dispensing pipe It. The boss I3b projecting from the partition wall It upwardly serves as a guide for an additional valve I! which is for ed upwardly to closing position against a seating surface on the valve ring 3 by means of a weak helical spring I'iathat is interposed between the head of the valve and the partition wall I3.

It will be obvious that upon flow of the liquid through the bore in the boss, rising from the partition wall [3, a suction will be created in the surrounding chamber [5 extending from this partition Wall downwardly. This suction chamber l5 communicates with a bore l8 provided horizontally in the partition wall and communicating at the outer end with a chamber I811 in the wall of the delivery stud This terminal chamber of the passage i8 is in communication with a tubing I9 extending downwardly alongside the delivery pipe l4 and terminating at the same level as said delivery pipe.

It will, therefore, be seen that upon the creation of suction by ejector action in the annular chamber l5, this suction will be propagated into the bore I8 and it will be dissipated by the air flowing through the tube H] as long as the end of the tube I9 is still accessible to air. But if the end of the tube is sealed by the liquid in the container A to be supplied, the suction in the annular chamber l5 will be effective and will be propagated from the chamber l5 through the annular wall of the delivery stud and from hence through a passage 23 in a post traversing the admission pipe 2.

The suction passage 20 is continued into a recessed extension 2| laterally of the casing This lateral extension serves for the reception of the automatic shut-elf assembly of the device. Within this extension or chamber, an annular shoulder adjacent the bottom of the extension supports the margin of a flexible diaphragm 22 held in position by a clamping ring 23. The top of the chamber is closed by a removable cover 24. The central portion of the diaphragm 22 is connected with a yoke 25 extending vertically through the diaphragm chamber and having a pin '26 projecting through the cover 24. This cover is provided with a plurality of openings 21, thereby rendering the space above the diaphragm accessible to the influence of the atmospheric air at all times. It will be obvious, therefore, that upon the creation of suction in the chamber 28 below the diaphragm 22, the diaphragm will move downwardly, thereby also shifting the yoke 25. This yoke is provided with a transverse pin 29 for cooperation with a latch hook 25a that is provided at one end with a slot for the reception of the actuating pin 29 and that is pivoted at the other end upon a bracket secured to the clamping ring 23.

The main valve 4 movable within the liquid chamber of the casing l is shown 'to be formed integrally with an upwardly projecting valve stem 33 slidable within the tubular guide |a that projects downwardly from the plate I I in the upper portion of the casing. The upper portion of the valve stem 30 also is guided by an axially movable bushing 3| which has at its lower end, in

.opposition to the plate H, a flange 3|a within the extension l2 projecting upwardly from this plate II. This guide bushing 3| for the upper portion of the valve stem 30 is movable in an axial direction owing to the provision of screw threads on its outer circumference in mesh with screw threads of a nut 32 fixedly positioned with respect to the cover 33 for the casing I. This cover 33, h0WeVer,-is rotatable on the top wall of the casing and is held against axial displacement owing to the provision of a screw 34 secured in the casing and projecting in a circumferential groove 35 on a downwardly directed flange 33a of the cover 33. Hence, upon rotation of the cover 33 relatively to the casing, a

rotary movement also will be imparted to the nut 32 secured to the cover. On account of the engagement of the screw threads on the bushing 3| with the threaded part of the nut 32 an axial movement will be transmitted to the guide bushing 3|. The flange at the lower end of the bushing 3| is provided with a horizontal pin 36 projecting into a vertical slot 31 of the annular projection |2 of the plate Rotation of the guide bushing 3| being prevented due to the projection of the pin 36 into the slot 31, the rotary movement of the nut 32 will be converted into axial displacement of the guide bushing 3|.

In order to effect a coupling of the axially movable guide bushing with the valve stem 39, the latter is provided with a circumferential groove 38 into which a coupling pin 39 carried by the lower head of the guide bushing 3| may be projected. For this purpose, the head 3|a on the lower end of the guide bushing 3| is provided with a horizontal bore permitting a sliding movement of the coupling pin 39 which carries at its outer end a head 4|. This head is guided for sliding vertical movement in the groove 42 of a coupling slide 43, the latter being horizontally movable in guideways lb extending between the circumferential wall of the upper portion of casing and the circumferential wall of the cylindri'cal extension l2 projecting from the plate ii. The groove 42 within this coupling slide 43 is of such formation that a horizontal displacement of the coupling pin 39 will be effected when this coupling slide 43 is moved inwardly in its guideways as well as outwardly towards the circumtion of the tubular cylinder 44 is cut away, as

indicated at 45 in Fig. l. The outer end of the cylinder 44 extends through a corresponding opening in the circumferential wall of the chamber 2| and is held in position by a closure ring 43 inserted into this wall. The cylinder 44 serves as a guide for an actuator bushing 41 which is closed at its outer end by a screw button as. The actuator bushing M has an enlarged bore at its inner end for the reception of a helical spring 49. This spring resting at its inner end against the bottom 44a of the guide M and acting at the opposite end against an internal shoulder on the actuator bushing 47, therefore, has a tendency to move the actuator bushing normally towards the right, Fig. 1, until an external shoulder 50 on said bushing engages the holding ring 46 which is firmly inserted in the circumferential wall of the.

casing. Upon pressure against the push button 48, this actuator 41 may, therefore, be moved inwardly towards the left, compressing thereby the helical spring. The inward movement of the actuator bushing to the left in the position indicated in Fig. 1 is limited by the engagement of the front end of the bushing with the end face of the guide cylinder 44, and the actuator is retained in said position while compressing the helical spring through the nose 5| of the latch referred to above.

The yoke 25 is maintained resiliently in raised position owing to the insertion of a spring 52 between the yoke and the guide cylinder 44. The

actuator bushing 41 is of tapering shape at its forward portion. The spring 52 on the yoke raises the yoke and thereby the pin 29 and latch to hold the end of the latch in contact with the tapering portion of the actuator. When the actuator bushing has been forced to the left sufliciently, as indicated in Fig. 1, the latch 250. will enter with its nose 5| to the rear of the shoulder of the actuator 44 and thereby look this actuator against return movement to the right.

The end wall of the guide cylinder 44 is provided with abore for the passage of a stem 53. This stem is provided in the interior of the actuator With a head 54 while the opposite end of the stem projecting through the end wall is secured to the slide 43. A weak helical spring 55 is interposed between the inner face of the push button 48 and the head 54 of the slide stem 53.

In normal. condition of this automatic shutoff mechanism, the actuator bushing 4! is forced by spring 49 towards the right until the external collar 50 thereon engages the stop ring 45. The inner shoulder 56 of the actuator is in engagement with the left hand end face of the head 54 pertaining to the stem 53, and. this stem is through the action of the spring 45 withdrawn to the right from that position in which it is illustrated in Fig. 1. When the operator then presses on the push button 48, the actuator is forced inwardly to the left and ultimately latched by the latch. This inward movement of the actuator enforced by the push button 48 also moves the stem 53, the transmission to the stem being a resilient transmission due to the interposition of the spring 55. The stem will thereby carry the slide 43 to the left into the position shown in Fig. l, and in this movement, the coupling pin 39 also will be carried to the left.

In the operation of the device, the valve 4 initially occupies the position shown in Fig. 1 while the actuator 41 occupies a, position to the right of that shown in Fig. 1, with the coupling :pin 39 thereby withdrawn from the groove 38.

The feeding stud 2' being connected to liquid under pressure, the pressure fluid will fill the chamber above the valve 4.

When it is desired to use the apparatus, the operator first presses on the push button 48 to insert the couplin pin 39 into the groove 38 of the valve stem, as detailed above. The operator then rotates the cover 33 of the casing to the desired degree with the effect that the rotation of this cover through the nut 32'is converted into axial movement of the guide bushing 3|. The guide bushing 3| being now coupled to the valve stem through the coupling pin 39 will axially move the valve stem in a direction to raise the valve 4 from its seat. This movement induced by the rotation of the cover 33 compresses the valve spring H], but as the thread on the rotary nut 32 and the thread on the guide 3| are square screw-threads, these elements are practically self locking. When the operator releases the cover 33, the guide bushing 3| remains in that elevated position to which it has been set','thereby, also leaving the valve 4 in open position. The liquid now flows against the valve IT, and as the liquid is under pressure, it forces this valve from its seat and continues its path through the openings in the partition wall l3 into the dispensing tube 4. At the same time, a portion of the liquid flows through the central bore, thereby inducing'suction in the annular chamber l5 surrounding the lower 6 end of the boss on the partition wall l3. This suction, however, is dissipated owing to the admission of air through the open end of the tube I9 and the communication of this tube with the passage I8 extending to the annular suction space Hi.

When the level in the container A, however, has reached a height at which the liquid seals the end of the tube IS, the suction created by the ejection action of the liquid becomes effective through the passage 2|! on the diaphragm 22, and the diaphragm snaps downwardly with the yoke 25, thereby moving the latch out of operative position with respect to the actuator bushing 41. The latter is forced to the right through extension of the spring 49, and towards the end of this movement to the right, the inner shoulder 53 of the actuator strikes against the inner face of the head 54 of the stem 53, thereby also moving the stem to the right, and withdrawing by means of the slide 43 the coupling pin from the groove 38 of the valve stem. Spring |0 now becomes effective to force the valve 4 to its seat, so that further supply of liquid to the delivery tube It is immediately in terrupted. The operator now returns the cover 33 to its initial position, and in this movement, the rotation of the nut 32 will induce axial movement of the guide 3| for the valve stem, so that the coupling pin 39 again is in a position ready to move into the groove upon the next actuation of the slide 43. The return of the valve 4 to the seat, as shown also has the effect of interrupting the pressure acting on the secondary valve so that the latter is lifted by the spring to its seat engaging position, as shown.

The parts now again are ready for operation.

In the embodiment illustrated in Fig. 2, the means for inducing axial displacement of the valve stem 63 are slightly different. Instead of maintaining the upper portion of the valve stem in a threaded guide bushing, as shown in Fig. l, the upper guide bushing 6| of Fig. 2 is provided with an upper extension 62 having an opening in which a transverse pin 63 is located. A lever 64 pivoted at 65 to the casing of the device projects with one arm through said opening and engage from below the pin 63. The other arm of the lever, however, is accessible for operation. The engagement between the transverse pin 63 and the arm is maintained owing to the provision of a leaf spring 66 secured to the cover of the casing and acting on the transverse pin 63.

After having moved the actuator bushing to operative position, as shown in Figs. 1 and 2, operator in the embodiment illustrated in Fig. 2, depresses the other lever arm, thereby raising the guide 6| for the valve stem 55 and hence, also lifting the valve 4 from its seat. Upon release of said lever arm, guide 6| for the valve stem is returned to its initial position, as leaf spring 35 acts from above upon the transverse pin 63. In other respects, the operation of this embodiment is the same as that illustrated in Fig. 1. It is obvious that in both of these embodiments, a release of the actuator bushing it! from the latched position in which it is shown, may be effected by the operator by simply pressing on the pin 23 projecting fromthe cover 24 of the automatic shut-off extension.

This automatic shut-on. as illustrated in Figs. 1 and 2, also is retained in the embodiment shown in Figs. 3 and 5. The means for lifting the valve 4 from its seat, however, and the means for coupling the operator controlled elements, as. for in- 7 stance, a rotary cover with the valve controlling elements ar slightly different;

As illustrated in the embodiment of Figs. 1 and 2, the guide plate again carries a tubular downwardly directed extension which constitutes a guide for the valve stem 61. This plate, however, is provided with a central cylindrical extension 68, also of a diameter small enough to constitute a guide for the valve stem 61. This extension 68 is provided with diametrically opposite slits B9 in which a transverse bar H1 is slidable. The plate and the tubular guide extensions are stationary within the casing of the device. A rotary coupling element H is movably disposed within the casing directly above the plate for the guides, coaxial with the valve stem and of a diameter just large enough to be rotatable within the upper portion of the casing. This rotary coupling element comprises a cylindrical wall 12 extending downwardly from a flat disc 13. The cylindrical wall 12 is provided with an enlargement between the lower and upper end thereof, and this enlargement is provided with a circumferential series of ratchet teeth M, as shown in Figs. 3 and 5. The same cylindrical wall of the coupling element also is provided with inwardly directed screw-thread '15, preferably of square cross-section for engagement with correspondingly shaped external screw-thread 16, on a tubular screw member H, the internal diameterof which is just large enough to accommodate the upward extension of the plate The transverse bar it is secured to this tubular member H, and as this transverse bar extends through the slots 69 of the guide 68, rotary movement of the tubular mem-' ber fl is prevented.

The top wall '33 of the coupling element H is provided with an upward extension 78 which is fixedly secured as by a screw 80 t the rotatable cover 8|. A spring housing 82 for a spiralspring 83 is interposed between the top plate 13 and the cover 8| and is secured immovably within the casing in any desired way. The spring 83, has one of its ends secured to the stationary spring housing 82, while the other end is connected with the rotatable stem or extension 18. The cover 8| may be equipped with openings 84 through which, upon rotation of the cover about its axis, the various imprints on a dial on the top face of the spring housing may be read. The imprints on this dial are not illustrated here.

In this embodiment, the stem 85 of the auto matic shut-off mechanism is shaped at its front end to form a pawl for the ratchet rim M of the coupling element 2 I.

In this embodiment, furthermore, the operation is conditioned upon the strength of the spring 83, exceeding that of the spring lfl'which surrounds the valve stem and normally forces the valve against its seat. The sprin l0 must be of such strength that upon pressure fluid being admitted into the casing Z, the spring permits the valve 4 to be lifted, provided the upper end of the valve stem 6'! is then spaced sufliciently below the transverse bar to permit such upward movement of the valve stem. Upon the operator having moved the actuator to the position shown and thereby having provided means for preventing movement of the coupling element' in one direction, he turns the cover 8| and winds the spring 83 in such manner that upon release of the cover 8!, the spring again will return the cover to its initial position. The turning movement of the cover 8| in that direction which is permitted after insertion of the stem 85 to holding position, will induce an axial movement of the rotary threaded member 11 upwardly, thereby moving the transverse bar 10 away from the upper end of the valve stem 61. The pressure of the fluid to be dispensed acts on the valve 4 and raises the valve to the position indicated in Fig. 3, maintaining thereby the engagement of the upper end of the valve stem 61 with the transverse bar. The operator may then release the cover 8|. A return movement cannot be effected until the pawl has been withdrawn from the ratchet rim 14. The withdrawal of this locking pawl is again effected under control of the vacuum beneath the diaphragm 22 when the container has been filled to the desired level. When this looking pawl is moved out of engagement with the ratchet teeth 14, the spring 83 will automatically return the cover 8| to its initial position, thereby also rotating the coupling member 1| and imparting axial movement to the tubular member 1'! i downward direction. This downward movement of the tubular member and transverse bar 18 will again seat the valve 4 to shut off position. In this device, therefore, also, the valve is automatically returned to its seat when the automatic shut-off mechanism affected by the suction in chamber l5 becomes effective on the diaphragm 22.

While in the embodiments shown in Figs. 1 to 3, the suction created beneath the diaphragm serves for uncoupling the valve stem so that the valve can be returned to closing position, in the embodiment shown in Fig. 4, the movement of the diaphragm serves for altering the circuit connections for an electromagnet.

The valve stem 86 is provided with a flat disc 81 disposed below the open end of the bell-shaped enlargement 88 of a guide 89 for the upper end of the valve stem. This upper portion of the guide 89 again is associated with the rotatable cover 98 for the casing in such manner that upon rotation of said cover, the internal screw thread 9| thereof in mesh with the screw-thread of the guide induces an axial movement of the guide 89. This axial movement is enforced owing to the engagement of a set screw 92 passing through the casing in an axial groove 93 of the enlargement 88. An electromagnet 94 is fixedly secured in the enlargement 88 of the guid for the stem, and upon being energized is adapted to attract the disc 81 on the valve stem 86, thereby raising the valve 4 from its seat and freeing the passage for the liquid to be dispensed.

' Conductors 95 serve for supplying the energization to the electromagnet from any suitable source, not shown. .One of these conductors is connected to one of two terminal posts 96, the other one of which is connected with the electromagnet.

These two terminals 96 are mounted in an insulating transverse element 9'! supported within the extension of the casing, in which also the suction controlled diaphragm 22 is located. A stud 88 associated with this diaphragm carries at its upper end a conductive circuit closing member 99 which, upon presence of balanced pressure on opposite sides of the diaphragm is forced into contact with the projecting ends of the terminals 96 so as to close the circuit between the same.

In this embodiment, the diaphragm 22, furthermore, is associated with a second diaphragm I00 clamped at ||J| to the stud 98 and having its marginal portion fixed within the extension. An opening in the wall of this extension serves for admitting atmospheric. air above the dia- 'phragm 22. Y

.In the operation of this embodiment, the operator selectively shifts the-upper guide 353 for the valve stem to a position within the casing of the device so as to determine the extent to which the valve Q may be opened. This rotary movement of the cover 90, however, does not yet open the valve. Upon closure of the current for the electromagnet 94 by means of a switch, not illustrated, the disc ill will be attracted to move upwardly to the extent determined by the adjustment or the upper guide 89. The circuit closing element 89 is in circuit closing position, as shown in Fig. 4, until, owing to the production of a vacuum in the chamber, the diaphragm 22 is moved downwardly, thereby separating the conductive element 93 from the terminals 336 and interrupting said circuit. The electromagnet then becomes suddenly deenergized and the spring ill will return the valve 4' to closing position.

In all of the embodiments illustrated, the device embodies manually controlled means for opening the valve and a diaphragm controlled by the suction jet nozzle for releasing the valve holding means Whenever the suction exerted on the diaphragm through the nozzle has reached a predetermined value.

I claim:

1. A liquid dispensing device, comprising 3, casnozzle in fixed relation to the casing and dispensing tube and in axial alinement with the valve, a diaphragm chamber, a passage extending from the suction jet nozzle through the casing to the diaphragm chamber, and diaphragm controlled means for releasing the valve holding element from the position to which it had been manually adjusted when the pressure in the diaphragm chamber has reached a predetermined value.

2. A liquid dispensing device comprising a casing with an inlet and outlet, a valve in said casing, a spring for normally constraining said valve axially to closing position, manually operable means for moving said valve to open position to selective extent, means including an element rotatable about the axis of said valve, and a tubular member engaging said first named rotatable element and surrounding the valve stem, a connecting pin projecting through said tubular member, a slide in which the connecting pin is mounted, additional manually operable means operable upon establishment of predetermined pressure conditions in the outlet for projecting the slide transversely to the tubular member and for engaging the connector pin with the valve stem, and means for withdrawing said slide and moving said connector pin from engagement with said valve stem, whereby the valve independently of axial displacement of said tubular member is returned to closing position under action of its spring, said last named means being suction controlled.

3. A liquid dispensing device comprising a casing having an inlet and outlet, a valve having 10 an axial stem in the casing, aspring normally constraining the valve axially to closing position, an axially displaceable tubular member loosely surrounding the stern of the valve, a holding element transversely extending through the wall of said tubular member, manually operative means for projecting said element into engagement with the stem of the valve, whereby upon axial displacement of said tubular member, the valve is moved to open position against the action of its spring, said last named manually operative means including a slide in which the holding element is slidable in axial direction of the valve, hand controlled means for moving said slide and holding element toward the valve stem, means for looking the slide in projected position, means controlled by the fluid to be dispensed for releasing said slide locking means, and spring means for returning the slide and holding element to inoperative position, whereby the valve under the action of its spring will be moved to closing position.

4. A liquid dispensing device comprising a, casing having an inlet and outlet, a valve having an axial stem in said casing, a spring constraining the valve to closing position, a tubular member surrounding the stem of the valve, a transverse pin in the tubular member, a slide supporting the pin, means for projecting the pin into engagement with the valve stem, means for raising the tubular member to move through said projected pin the valve to any selectively determined open position, means for locking the slide and pin in projected position, a suction jet nozzle in the outlet, means controlled by the suction in the nozzle for releasing said slide locking means, and additional means independent of said suction. controlled means for releasing the slide locking means to return the valve to closed position under the action of its spring.

5. A liquid dispensing device comprising a cas ing with an inlet and an outlet, a valve with an axial stem in the casing, a spring normally constraining the valve to closing position, an axially displaceable member loosely surrounding the stem of the valve, a pin within the tubular member at right angle to the axis thereto, a slide supporting the pin, means for normally holding the slide and pin in inoperative position with respect to the stern of the valve, means responsive to thumb pressure for advancing the pin to operative position with respect to the valve, means for automatically locking the pin advancing means in operative position, a suction jet nozzle fixedly related to the outlet and in the path of the liquid dispensed from the device, and means controlled by the suction jet of the nozzle for releasing the pin locking means whereby the valve will be returned to closing position by the spring after it had been opened.

5. A liquid dispensing device comprising a casing having an inlet and outlet, a valve With an axial stem, slidable in axial direction within the casing, a spring normally constraining the valve to closing position, a tubular member loosely surrounding the stem, manually operable means for imparting axial sliding movement to said tubular member, a pin carried by the tubular member, a slide supporting the pin, a tubular push button having its axis at right angle to the axis of the valve, a spring in the push button for normally holding said push button outwardly from the cas ing, a slide rod guided in the bore of the push button and connected with the slide, whereby upon pressure upon the push button inwardly said 1 I slide and pin are advanced to operative position with respect to the stem for axially displacing the stem upon axial displacement of the tubular member surrounding the stem, a spring controlled locking element for the push button operative to hold the push button in inward position after it has been actuated, a suction nozzle in fixed relation to the outlet from the casing and in the path of the liquid dispensed therefrom, a

12 diaphragm chamber in communication with the suction jet of the nozzle, a diaphragm in said chamber, and means connected with said diaphragm for withdrawing the spring controlled locking element for the push button from operative position when the suction produced by the jet in the diaphragm chamber has attained a certain value.

ERNST GIGER.