US2428577A - Liquid-measuring dispenser - Google Patents

Description

Oct. 7, 1947.

Fla. 1. 53

1 w. T. MA'THIS 2,428,577

LIQUID-MEASURING DISPENSER Filed Sept. 6, 1945 T |C1.Z. FIGB,

I 23 33 as as a m 3 '33 3- ggi lillz as 36 a? I as i 58 38 I i INVENTOR WADDY T. MATHIS ATTORNEYS:

Patented Oct. 7, 1947 UNITED STATES PATENT OFFICE,

LIQUID-MEASURING DISPENSER Waddy T. Mathis, Hamden, Conn.

Application September 6, 1945., SerialNo; 614,"793

'5 Claims. 1

The present invention relates to improvements in liquid dispensers and relates more particularly to dispensers which also serve to accurately measure the liquid to be dispensed.

fI-he liquid-measuring dispensers of the present invention are primarily designed for the use of chemists in lieu of usual pipettes, though available for other uses, as will be apparent to those skilled in the art from the following;

Gne of the objects of the present invention is to provide a superior liquid-measuring dispenser which combines convenience and accuracy in use with low cost of manufacture;

Another object of the present invention is to provide a dispenser of the characterreferredto which has a superior construction an'diarrangement of parts whereby the amount'of liquid'dispensedmay be readily and conveniently ad.- justed.

A further object of the present invention is to provide a superior liquid-measuring dispenser which may be readily and conveniently taken apart for cleansing or repairs and which also may be similarly reassembled.

Still another object is to provide a superior dispenser of the character referred to, which may be manipulated with great rapidity to accurately discharge measured amounts of liquids.

With the above and other objects in view, as will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a View in side elevation of one form of liquid-measuring dispenser embodying the present invention;

Fig. 2 is a View thereof viewing the dispenser from a right angle to the showing of' Fig. 1

Fig. 3 is a view in central-longitudinal section taken'on the line 3-3 of Fig. 1;

Fig. 4 is a perspective view -of"one.-=of the two corresponding body-members, detached;

Fig. 5 is a broken view in side elevation of: the upper portion of the dispenser, but shown on a larger scale; and

Fig; 6 is a perspective view of the measuring- 1 2 reference characters Iil and II and each having flat inner face which is adapted to abut against thesimil ar face o'f'the complemental body-member, to provide a complete body.

Each of the said body-members l9 and H- includes a substantially-hemispherical intermedi ate-portion 1 2 from which integrally depends a slightly-tapering shank-portion i3. Each of the said body-members is also formed with a neckportion I' lwhich is formed integral with and extends upwardly from the intermediate-portion i2.

The hemispherical intermediate-portion I2 of each of thebody-members H3 and H is hollowto provide a subs-tantially-hemispherical bulbsocket l 5- which; when the two body-members are assembled, provides in conjunction with the similar bulb-socket in the other body-member, a substantially-spherical space for the accommodation of a bulb [6 formed of rubber or other suitable material. The upper part of the hemispherical interrnediate-portion [2" of each-of the body-members- H1 and ii is cut away in part to thus leave a pair of curved arms il-il which serve -t'ointegrally interconnect the aforesaid neck-portion M with the remainder ofthe bodymember as is especially well shown in Fig. 4.

Theneck-portion llofea'ch of the body-members 10' and "H isformed with a vertical guidegroove 48 ofsemicircular form in cross section which complements the similar guide-groove in the other neck-portion to form a cylindrical guide-passage for the stem it of a dispensingplunger or dispensing-member generally designated by the reference character 20. Theste-m F9 is provided at its lower end with a relativelythin disk-like head 2i adapted to rest upon the upper surface of the bulb i'fi; for purposes as will hereinafter'appear.

At its threaded upper end the stem $9 of the dispensing plunger 20- has mounted thereon a lock-nut 22 and a stop-nut 23 located below the 'said lock-nut.

In the upper portion of its shank-portion 13; each of the body-members iii and ii is formed with a socket 24 of semicircular form in cross section and which, in conjunction with the similar's'ocket 24 of the other body-member, is adapted to accommodate a tubular neck zfiforming an integral dependingextension of the bulb 1'6.

The lower portion of the shank-portion l3 of each of the body-members It and H, is formed with a downwardlywpening socket 26 which is of" semicircular form in cross section and provides. when the two body-members are assembled: face to face, a cylindrical-socket for the accommodation of a tubular coupling 21 which is preferably formed of soft rubber or the like.

As shown, the socket 25 has a larger diameter than the. socket 23 and is separated therefrom by a locating-rib 28, as is especially well shown in Fig. 4. Extending past the locating-rib 2B and into both the coupling 21 and the neck 25 of the bulb I6 is a connecting-tube 29.

Fitting into the lower end of the resilient coupling 21 is the upper end of a tube 30 which 'may be formed of glass or other suitable chemicalresisting material and which is formed at its lower end with a contracted tubular terminal 3|, through which latter fluid may be drawn into the tube or expelled therefrom, in a manner as will hereinafter appear.

For the purpose of holding the two complemental body-members l and II in assembled face-to-face relationship as illustrated in the drawings, a collar 32 and a measuring-sleeve or measuring member 33 are employed. The said collar 32 has a slightly tapering interior and is slipped over the respectivetapered lower ends of the shank-portions 13-43 of the said body-members. The measuring-sleeve 33 is slipped over the juxtaposed neck-portions l4l4 of the bodymembers I0 and H with capacity for both rotational movement and axial movement thereon.

Preferably and as shown, the measuring-sleeve 33 is rolled up from sheet material and is cut away on one side to provide a series of four (more or less) downwardly-facing stepped abutments respectively designated by the reference charac-,

ters 34, 35, 36 and 37 and each of which is adapted to rest upon an abutment-lug 38 projecting radially outwardly from the neck-portion Id of the body-member ill. The said abutments 34, 35, 36 and 31 are, in the order named, more remotely located with respect to the inner edge of the measuring-sleeve 33. 7

V In a manner as will hereinafter appear, the dispensing-plunger 2!) will be depressed to expel liquid from the device in measured quantities. For purposes of providing convenient means for shifting from one quantity to another quantity of liquid to be dispensed, the stop-nut 23 may be so set that when the measuring-sleeve 33 has,

its extreme lower edge resting upon the abutment-lug 38, the under face of the said stop-nut will be in engagement with the upper edge of the said measuring-sleeve. The said stop-nut'23 may then be locked in the position referred. to by tightening the lock-nut 22 against it. Under these conditions, it will not be possible to depress the plunger 20 to expel liquid from the terminal 3| of the tube 30. 7

Now let it be assumed that it is desired to dispense 0.1 c. c. of a liquid. Under these conditions, the measuring-sleeve 33 will be shifted so that its lowermost abutment 34 is resting upon the abutment-lug 38. It is also to be assumed that the size of the bulb [6 is in the given instance, such as to eject the desired volume of I liquid.

The dispensing-plunger 20 may be depressed to partially deflate the bulb l6 and preferably the. user may also further deflate the said bulb by applying finger pressure to the surface thereof through one or more of the cut-away upper'parts of the hemispherical portions l'2l2, following which the terminal 32 may be dipped into the desired liquid. Now upon releasing the, deflating pressure upon the bulb Hi, the same will draw 3 into the tube 3!] an amount of liquidslightly in excess of the desired 0.1 c. c. The. terminal 31 may now be removed from the liquid, following which the dispensing-plunger 20 may be depressed until its downward movement is checked by the engagement of the under face of the stopnut 23 with the upper edge of the measuringsleeve 33 to thus eject the desired 0.1 c. c. of liquid but still leaving a surplus of liquid in the tube 33. It is preferred to charge the tube 30 or its equivalent with a greater amount'of liquid than it is desired to eject, for the reason that this procedure eliminates drainage-error.

Should it be desired, for instance, to dispense 0.5 c. c. of a liquid, the measuring-sleeve 33 may be shifted so that its abutment 35 rests upon the abutment-lug 38, whereupon the procedure above described may be repeated to effect the accurate discharge of 0.5 c. c. of liquid, assuming, of course,fthat the parts are proportioned and designed to dispense the specific amount of liquid referred to, when the measuring-sleeve is adjusted as just referred to.

lug 36, and here again, the procedure previously referred to may be repeated.

The values above given for the various positions of the measuring-sleeve 33 are, of course, merely illustrative, but serve to demonstrate the facility with which the dispensing capacity of the device may be varied.

Should it be desired to secure any other values than the fixed values afforded'by the various abutments 34, 33, 33 and 37 of themeasuringsleeve, the stop-nut 23 may be adjusted on the stem I9 of the dispensing-plunger 20 and locked in any desired position by means of the lock-nut 22. Thus, by means of the adjustment afforded by the stop-nut 23 or its equivalent, substantially any value intermediate the maximum and minimum may be arrived at.

The invention maybe carried out in other spe! cific ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are; therefore, to be considered in all respects as illustrative and not restrictive, and all changes comingwithin the meaning and equivalency range of the appended claims are'intended to be embraced therein.

I claim:

1. A liquid-measuring dispenser, including in combination: an expansible and contractible hollow member for drawing fluid into and expelling fluid froman extension; a tubular extension projecting' from the said hollow member; an advanceable and retirable dispensing-member positioned to compress the said hollow member during its movement with respect to the hereinaftermentioned measuring-member; guide-means associatedwith the said hollowmember; an abutment adjacent to said guide-means; and a normally stationary adjustable measuring-member guided by the aforesaid guide-means and having a plurality of abutments selectively engageablewiththe said abutment adjacent to the saidgui de-means, the

said measuring-member having a portion positioned to be engaged by a portion of the said movable dispensing-member to limit the movement thereof to an amount dependent upon which of the plurality of abutments of the measuringmember is engaged with the abutment adjacent to said guide-means.

2. A liquid-measuring dispenser, including in combination: a resilient hollow bulb for drawin fluid into and expelling fluid from an extension; a tubular extension projecting from the said bulb; guide-means associated with said bulb; an advanceable and retirable dispensing-member positioned to compress the said bulb during its movement with respect to the hereinafter-mentioned measuring-member; an abutment adjacent the said guide-means; and a normally stationary adjustable measuring-member guided by the aforesaid guide-means and having a plurality of abutments selectively engageable With the said abutment adjacent to the said guidemeans, the said measuring-member having a portion positioned to be engaged by a portion of the said movable dispensing-member to limit the movement of the latter to an amount dependent upon which of the plurality of abutments of the measuring-member is engaged with the abutment adjacent to said guide-means.

3. A liquid-measuring dispenser, including in combination: a body having a bulb-holding portion and a guide-portion; a resilient hollow bulb held by the bulb-holding portion of the said body; a tubular extension projecting from the said bulb; a dispensing-plunger guided by the guide-portion of the said body and engageable with the said bulb to compress the same during its movement with respect to the hereinafter-mentioned measuring-sleeve; an abutment adjacent the guideportion of the said body; and a normally stationary adjustable measuring-sleeve mounted upon the guide-portion of the said body with capacity for both turning movement and axial movement thereon, the said measuring-sleeve having a plurality of abutments selectively engageable with the abutment adjacent the said guide-portion of the body, the said measuring-sleeve also having a portion positioned to be engaged by a portion of the said dispensing-plunger to limit the movement of the latter to an amount dependent upon which of the plurality of abutments of the said measuring-sleeve is engaged with the abutment adjacent the guide-portion of the said body.

4. A liquid-measuring dispenser, including in combination: a body having a bulb-holding portion and a guide-portion projecting therefrom; a resilient bulb held by the bulb-holding portion of the said body; a tubular extension projecting from the said bulb; a dispensing-plunger extending substantially axially through the guide-portion of the said body and having adjacent one end, a portion engageable with the said bulb to compress the same during its movement with respect I to the hereinafter-mentioned measuring-sleeve and having stop-means adjacent its opposite end in position for engagement with the hereinaftermentioned measuring-sleeve; an abutment carried by the guide-portion of the said body; and a normally-stationary adjustable measuring-sleeve mounted upon the projecting guide-portion of the said body with capacity for both turning movement and axial movement thereon, the said measuring-sleeve having a plurality of abutments selectively engageable with the abutment on the said guide-portion of the body, the said measuring-sleeve also having a portion positioned to be engaged by the stop-means of the said dispensing-plunger to limit the movement of the latter to an amount dependent upon which of the plurality of abutments of the said measuringsleeve is engaged with the abutment carried by the projecting guide-portion of the said body.

5. A liquid-measuring dispenser, including in combination: a body having a bulb-holding portion and a guide-portion projecting therefrom; a resilient bulb held by the bulb-holding portion of the said body; a tubular extension projecting from the said bulb; a dispensing-plunger extending substantially axially through the guide-portion of the said body and having adjacent one end a portion engageable with the said bulb to compress the same during its movement with respect to the hereinafter-mentioned measuring-sleeve and having an adjustable stop-nut adjacent its opposite end in position for engagement with the hereinafter-mentioned measuring-sleeve; an abutment projecting laterally from the guideportion of the said body; and a normally stationary adjustable measuring-sleeve mounted upon the projecting guide-portion of the said body with capacity for both turning movement and axial movement thereon, the said measuringsleeve having a plurality of abutments displaced with respect to each other in a direction axially of the measuring-sleeve and selectively engageable with the abutment projecting from the said guide-portion of the body, the said measuringsleeve also having a portion positioned to be engaged by the stop-nut on the said dispensingplunger to limit the movement of the latter to an amount dependent upon which of the plurality of abutments of the said measuring-sleeve is engaged with the abutment projecting from the guide-portion of the said body.

WADDY T. MATHIS.

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

' UNITED STATES PATENTS Number Name Date 531,133 Pomeroy Dec. 18, 1894 2,339,870 Mathis Jan. 25, 1944 FOREIGN PATENTS Number Country Date 622,853 France March, 1927

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