US2521433A - Measuring pump with adjustable stroke indicator and stop - Google Patents

Description

Sept. 5,v 1950 H. A. WHITE 2,521,433

I MEASURING PUMP WITH ADJUSTABLE STROKE INDICATOR AND STOP 2 Sheets-Sheet 1 Filed Sept. 25, 1948 IINVENTOR.

Sept. 5, 1950 H. A. WHITE 2,521,433

MEASURING PUMP WITH ADJUSTABLE STROKE INDICATOR AND STOP Filed Sept. 25. 1948 2 Sheets-Sheet 2 i1- 24 I 23 4o 67 22 A Z55 Z1 /2 56 '43 a 4 44 I, 1 I I l l 36 51 I 1 1-15 v I: I 0

,J 57 I 1 J so 55 55 a9 F I 1 I l 7/ j 19' 2 2 J 4 K j 66 h JNVENTOR.

ATTORNEY Patented Sept. 5, 1 950 MEASURING PUMP WITH ADJUSTABL I STROKE INDICATOR'AND STOP- Harry A. White, Ottawa County, (lhio, assignor to The White Manufacturing Company, Toledo,

Ohio, a corporation of Ohio Application September 25, 1948, Serial 51,230

,Myinventionrrelates, to the dispenser art and particularly to the art of periodically operated andmeasuring. liquid dispensers. An embodiment of my invention is readily adapted to use,

in dispensing measured quantities of cream in the'purveying of coffee by the cup.

Liquid .disensers available and known to the art, heretofore, are of such complexity andmultiplicity of separable parts that a disassembly of the same, for purposes of cleaning, requires skilled knowledge and utilizes considerable time. Asa consequence, the task of cleaning has been slighted, unless supervised, and the degree of maintained cleanliness required by public health codes often is not met. In some constructions cleansing, operation in disassembly, are main tained in loosely connected or chained relation, facilitating handling without risk of part loss ordisturbance of desired operative relation in the cleansing operation. Theinvention further provides a construction in which reassembly, fol lowing cleansing, may be readily effected.

The invention has for a further object to pro- '2 c ai s; f (01. 2224s) spirit of the invention. The particular structure selected is shown in .the accompanying drawings and described hereinafter.

Fig. 1 of the accompanying drawings illustrates I Figs. 1 to l of the accompanying drawings includes an open ended housing I of pleasing ap pearance adapted to be disposed on the counter or service bar, in a position of convenience to u se.- The housing I is preferably of general cylindrical contour having a lateral side wall 2 and bottom wall 3, which are thermically insulated vide, a liquid dispenser having a housing provided I with thermally insulated walls and provision for containing a coolant or refrigerant in heat exchange relation to the liquid to be dispensed.

appearance and low cost.

Theinvention consists in other features and advantages which will appear from the following description and upon examination of the drawings. Structures containing the invention may partake of different forms and still embody the invention. To illustrate a practical application OfHthe invention, I have selected a measuring liquid dispenser as an example of the various.

- tiqnsimay h nude w thout. depar ng. rom 1 e.

. 40 ,A stillfurther object of the invention is to provide a liquid dispenser of attractively pleasing.

against heat exchange between the zone within the housing I and the exterior atmosphere.

Disposed within the housing I is provided an.

The container 5 open and liquid container 5. is supported by means, such as the protruding dimples 6 formed in the side lateral wall of the containerin engaging relation to the inner surfaces of the walls 2, adapted to support the con-- tainer 5 in a nesting coaxial and spaced relation to the; housing I. The housing walls 2 are provided with an annular shoulder l in spaced relation to the plane of the housing bottom wall 3. The shoulder is adapted to engage the container 5 and support the same in spaced relation to the bottom wall 3. The space, indicated at 8 in Fig. 2, of the accompanying drawings, thus formed between the housing bottom wall 3 and the container 5 provides a compartment which may be charged with a coolant or refrigerant maintained in heat exchange relation to the container 5 and to a liquid therein for dispensing.

In order to provide a removable closure for both the housing I and container 5, I provide a cover plate ill of general discular contour. The cover plate It] has a depending skirt or flange l l which.

plate It besides providing the closure means mentioned also functions as a supporting means for thepumpingmechanism of the dispenser now to be described.

The pumping mechanism is best shown in assembled form in Fig. 2 of the accompanying drawings. When disassembled for cleaning, the parts of the mechanism appear as shown in Fig. 3 of the drawings. The pumping mechanism includes a pair of telescopically pumping cylinderparts. One of said cylinder parts is embodied in the open end cylindrical part mounted on the cover plate i 0. Preferably, the part l'5 extends through and is press fitted to the edges of an opening formed in the cover plate Hi. In such position, the part [5 is supported with its major axis extending vertically and its open end facing upwardly and outwardly of the housing. Preferably, the open end of the part i5 is provided with a square bead or annular shoulder 16 which engages the cover plate is and serves to supplement the sealing and affixing obtained by the press fit mentioned.

The lower end of the part l5 has a ported and sonically surfaced end wall H. The port [3 of the wall I? communicates with the interior of the container 5 through a suitable sucker tube l9 extending to a point well within the confined space enclosed by said container. Preferably, the sucker tube i9 is press fitted to the part [5 and, thus, the part l5 and cover plate It are effectually integrated.

The second cylinder part of the pumping mechanism is embodied in the manually operableopen end cylinder part 20. The part 20- is adapted to slidably fit within and be reciprocable relative to the part I5. Like the part if, the part 20'has a ported, sonically surfaced end wall 2i. The port 22 thereof communicates with a discharge tube 23 through which liquid may be dispensed. The upper end of the part ililis provided with a shouldered surface 2 t adapted for manually pressing to move the part 23 downwardly and telescopically relative to the part l5, thereby to effect displacement of liquid in and between the parts [5 and 2G, outwardly through tube .22.

In order to provide a system of valves cooperative with the cylinder parts 15 and '20 and to provide means operating to cause liquid recharge of the cylinders following manual compression, I provide a valving and actuating assembly. Said assembly as is shown in Fig. 3 of the accompanying drawings includes a resilient element embodied in the compressible spring 39, and a pair of ported valve seat units, embodied in the units 3|, connected to the opposite ends of said resilient element and a pair of valve members each pinned in and to one of said valve units. Thus, I provide an assembly that, when disassembled, as shown in Fig. 3, has all its parts and all the surfaces of said part-s exposed for cleaning but which parts are so chained together that there is no danger of individual part loss or reassembly in inoperative order.

The valve seat units 3i each have an annular bearing surface 33 of conical contour adapted to fit and engage the conically surfaced end wall I"! and 2| of one of the parts 15 and 29 so that when pressed there-against, by the constraint of the spring 30, will prevent passage of liquid or air between said surface 33 and the particular end wall engaged thereby. The units 3! are each provided with a valve opening 35 with which a valve member, such as the member 36, is associated.

Each valve member 36 has a head 31 and a pin shank 38. The shank 38 has a bifurcated end 39, the legs of which extend to points at greater spaced relation than the diameter of the valve opening 35. Thus, when installed with the shank 33 extending through the opening 35, the valve member 36, although free to move to open and close the opening 35 and expose the surfaces thereof for cleaning, cannot be dislodged from an operative relation and automatically assumes its desired operative position, on reassembly.

As is shown in Fig. 2 of the drawings, the valving and actuating assembly just described is designed to be positioned between and withi the cylinder parts t5 and 20. The manual depression of part 20 causes compression of the spring 30 and the liquid disposed within and between the parts l5 and 2c exerts a pressure against the valve member 36 controlling flow through port 22 of the end wall 21 to open the valve member in a manner well known in the art. Upon a discontinuance of the application of manual pressure to the part 20, the spring 30, now in a state of compression, urges the part 23 to move upwardly. A condition of atmospheric rarefaction is thus created in and between the parts l5 and 20', allowing the valve member at controlling port 22 to close and causing the valve member 36 controlling port is to open. As is well known in the art, liquid within the container 5 will, by atmospheric pressure, be caused to pass up through sucker tube 19 and into the space between and within the parts 15 and 2B, for subsequent ejection.

In order that the stroke of the part 20 relative to the part l5 may be restricted and thus measured quantities of liquid be discharged at each complete depression of the part 20, I propose to provide an adjustable stroke limit means. Said means is embodied in a traveling rod 40 suitably pinned to the part 20 and extending through a gasketed opening 4 formed in the cover plate iii. Said rod 4i! may have annular recesses 62, as shown in Fig. 2, adapted to receive opposite legs of a removable clip 43, best shown in Fig. 3 of the drawings and located on the underside of the cover plate Ill. Thus, as shown in Figs. 2 and 4, the clip 43 limits the upward stroke of the part 29 to any desired degree according to the particular recess 42 engaged thereby. If desired, the clip i3 may have a tell-tale tag portion 4d bearing gauge indications which, when read in conjunction with the lower end of the rod ill in its particular position of engagement with the clip 33, advise of the quantity of liquid that will be dispensed upon a full depression stroke of the part 26.

In the form of construction shown in Fig. 5 a sleeve member 13' is used, in lieu of the mentioned clip, in conjunction with a rod 40'. The sleeve member d3 may be adjusted along the length of the rod All and belocked thereto by a suitable stud. Also, in the form of construction shown in Fig. 5, the valve members 36 comprise well known ball checks disposed in tubular housings 5i]. One housing 59 is threadably connected to the part 2&3 and the other to the lower end of the sucker tube 19'. The container 5 is. identical with the container 5 and is adapted to be received within a housing similar in all respects to housing l.

While I have illustrated and described the best forms of my invention now known to me, as required by the statutes, those skilled in the art will readily understand that changes may be made in the disclosed construction without departing from the spirit of my invention as set forth in the appended claims.

I claim:

1. In a liquid dispenser having the combination of an open ended housing; an open ended liquid container adapted for disposition in nesting coaxial relation to said housing; a cover plate adapted for disposition over the open ends of said container and housing to form a removable closure for both of the same; the provision of liquid dispensing means characterized by being easily disassembled and having a pair of telescopically related pumping cylinder parts; one of said'parts extending through and sealed to an edge of an opening in said cover plate and adapted for prosaid inner conically surfaced end walls of the cylviding a slide bearing for the movement of the other part in mutually coaxial telescopic relation thereto; each of said cylinder parts having an inner conically surfaced and ported end wall of like contour; a valving and actuating assembly adapted for disposition between and within said telescopically related cylinder parts and having a longitudinally compressible resilient element, a pair of ported valve seat units of identical contour connected at opposite longitudinal ends of said resilient element and a pair of pinned valve members of identical contour each movably supported on and operatively associated with one of said valve seat units and adapted for controlling flow through the port thereof; each of said valve seat parts having an annular bearing surface adapted for engaging said inner conically surfaced end wall of one of said cylinder parts Wherefore, upon relative movement of the telescopically related cylinder parts toward each other, said compressible element will be compressed urging said valve seat units said annular surface to bear with increased sealing pressure against inder parts and. tending to effect movement of said cylinder parts to movement away from each other.

2. In a liquid dispenser, claimed in claim 1 having in addition thereto means connected to one of said cylinder parts adapted to limit the movement thereof and comv prising a. rod connected at one end thereto to the said cylinder part and a stop part; the shank of the rod adapted to extend through and be guided by an opening in said cover plate; the stop part having means adapted'fc-r adjustably engaging said shank in a desired adjusted position along the length of the same thus limiting, by engagement with the inner surface of the cover plate, the movement of said cylinderpart in response to the forces exerted by said compressible element.

HARRY A. WHITE.

. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 958,871 Helmer May 24, 1910 1,626,544 Torant Apr.- 26, 1927 1,915,343 Williams June 27, 1933. 2,090,403 Murray i Aug. 17, 1937 2,157,154 Tweed May 9, 1939 2,158,318 Bernhardt May 16, 1939 the combination as

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