US1651866A - Apparatus for dispensing viscous materials - Google Patents

Description

. Dec. 6, 1927. 6 1,651,866

' I G. H. BowERs APPARATUS FOR DISPENSING VISCOUS MATERIALS Filed on. :5. 1925 2 Sheets-Sheet 1 DOC 0000000000 'a ooooco G. H. B OWERS APPAR$TUS FOR DISPENSING VISCOUS MATERIALS Filed 061?. 5. 1925 2 Sheets-Sheet Patented Dec. 6, 192 7 a .1 We harem oetics;

(molten H. Bows-Rs; 10F EBUEFALO, NEW YORK.

errannmns 101; vansienivsiwe viscous iMATERIALS Application-fi1ed\Qcto'her 3,1925; Serial l\To. 60,204. 5 a

"window frames duringjthe operation of glazing and for other analogous; uses;-

For the present however this apparatus will be more particularlydescribed in connection with its'useas anapparatus form-applying-paste'tocores and partsQof molds, as an example of the most important use which .has been found for this invention at the present time. o v

As is well "known it is.;a common practice in foundries to use paste in considerable quantities in connection with molds. In

' later years due to the production of 'automotive castings, 'in which great quantities of cores are employed, the :use of pasteehas been greatly increased. 1 Foundry paste is usually made from -a variety of materials, such as wheat -:flour, 'dextrine, glutin, etc, thefflourbeing the mostrcommon; ;It has also been the pr'acticein connection withesome kindsof worktoruse hot glue. f

In a foundry, paste is used for the pur- :poseof cementing together in one piece two 201' more :parts of :a core in-order to :prevent the hot met al from getting between [the parts of the-core and thus preventnthe formation of fins and 13.150 prevent the metal which is poured into the moldjcavity from getting into the Vents which are 'provided'withioutlets through which escape 'isaiforded for the gas and steam generated by 'the action of the hot metal on the binding material used in thB'COI'QS' Paste of this character is also used on the'surfaces of dry-sandimolds for connecting the parts thereof and prevent runouts, that is to say theescap'e-0f metal at the joint between the parts'of ?the *mold. i

It has been the-common practice in ifoundries to mix and keep paste in open con tainers an-dito apply it to the joints'of cores and parts of molds ,withya paddle, :brush, spoon or small tin can which occasioned the been applied forjthis purpose by means of squirt cans and grease cans flout any gains Vconsiderableamount of the paste must thereloss" of .a rgreatdeali of Qtime inasmuch as v these methods of operation are'ver-y slow and it also :Was accompanied by a great waste ofunater'ial owing to the fact that the use of pastelin thismanner was underpoor control.- These methods heretofore employed 'in ,the application of pa ste t,o' joints between 7 cores and mold parts also tended to increase the Iloss-of i castings because the operator was EIi abIetoapply-a coat of paste oVer'too large 65 .a surface ,on the cores or mold parts, therev.by. preventing theeasy passage .of gases from .core to core. f 1 v Heretofore n somennstances ,.paste ,has

made by their userarelostjonaccount. of

thefinecessity of frequently filling these tools; a. As pastel for this purpose is better when two or three days old, the open jcontainersin which-such ;pa s,te has heen usually stored, particularly'in warm .weather, attract swarms of flies andgivefoff unpleasant ,odorsr In addition to this .such containers; are also wasteful inasmuch as thick skins of dry-- .paste ..form on top of the ,paste and :on the sides of thelcontainer duringethehours when 1 the ypaste isjset away andnot .in use and ;a

fore be thrown (away.

menting together the parts Koflcores and molds and these implements" are also the' nmost ineflicient owing .to the fact ,thatas the .paste isappliechto thesurfaces of the cores or molds the-coating of the rsame is flatties-in either of the surfaces. and makes 1a perfectly tightjoint.

It-is the-object of-this invention tolpro vide I an apparatus for dispensing pasteor other J aviscous or paste .like .m'aterialj more quickly and easily 5 and with greater uniformity and without waste-of :material thereby eflecting a substantial economyynin-the cost of doing thisflwork and-salsa producingira :SHPBII'OI 1 r f The brushfandgpaddl'ejmethodflabove re- .ferred to .arelmost.commonly ,used [for .ce-

applying the same to the parts product particularly when used for cementing together the parts of a core or the sections of a mold.

In the accompanying drawings:

Figure l is a'verticalsection of the p referred embodiment of my invention showing the same organized for delivering paste and of a core or the sections of a mold.

Figure 2 is a horizontal section taken on I the correspondingly numbered :line in Figure 1. V p p Figure 3 is a sideelevation, partly in section showing a modified form of my invention as compared with that shown in Figures therewith by means of a screw joint and an upper head 6 which closes the upper end of the cylindrical body 4 and is -also connected therewith by means of a screw joint. These several partsof the chamber maybe constructed of any suitable material which'will enable the same to withstand rough usage and also withstand an internal air pressure equal to the highest which'is usually carried in industrial plants.

The material which'is to be dispensed in this apparatus, such for example as paste intendedfor coating the cores' and mold sections of molds is preferably introduced into the dispensing chamber through an opening 7 in its top ,which opening may be covered by a closure of any suitable character for instance a screwplug 8, asshown in Figurel. H

This apparatus may be supported in an upright position in anysuitable manner for instance by legs 9Ipreferably three in numher which depend from the lower head of the dispensing chamber and are adapted to rest on the floor. or other suitable support. 'In its lower part the dispensing chamber is provided with an outlet for the paste which outlet communicates with the inlet of a flexible hose 10 whereby the paste maybe applied to cores or molds located in different parts .of the foundry, the application of the paste and the discharge of the same on the cores or mold surfaces being governed by means of a hand controlled valve applied to the outlet end 'ofthe delivery hose '10'and. provided with a removable discharge nozzle 12. The latter is preferably detachably connected with the outlet 13 of the delivery valve and thus permits of using nozzles of different sizes and thus enable the delivery paste tobe varied in accordance with the character of the'work which is to be ccmented together. The discharge of the paste from the dispensing chamber through the outlet in the lower part thereof and to the hose 10 and nozzle is effected by air pres sure Which is introduced into the upper end of the dispensing chamber by means of a pressure pipe 1.4 extending through the upper head 6. This air pressure may be derived from any suitable source in the plant and as this pressure is usually comparatively high at the source of its generation and onlya very slight air pressure 'is required for forcing the paste out of the dispensing chamber, for example thirty pounds, it is desirable to employ a pressure reducing valve 15 in the'air pressure line 14 which pressure regulator may be of any suitable" and approved character and of a type now commonly in use for this purpose in air pressure installations. During the operation of this apparatus but very little-air pressure is consumed inasmuch as no compressed air is wasted and only a constant pressure is maintained on top of the paste 'to secure a uniform and effective discharge of the'sam'e from thechamber to the outlet nozzle 12.

Instead of permitting the paste tofiow directly from the dispensing chamber into the delivery hose 10 it is preferable to employ some means for straining or screening this paste and remove therefrom any lumps or solid particles which may be contained therein, such lumps being retained in the dispensing chamber while the paste of uniform consistency is delivered by the hose .10 to the deliverynozzle 12. Although this screen or strainer may be variouslyconstructed, that shown in Figures 1 and has generally the form of an upright cylinder and comprises afllowerhead 16 which is screwed in a central opening 17 formed in the lower head of the dispensing chamber and provided with an outlet opening 18 which is connected by means of an elbow 19 with the inlet end of the hose 1O, a cylindrical upright body 20 secured at its'lower end in a pocket formed in the lower head '16, and provided withjaplurality of perforations 21, and an upper head 22 which closes rin the paste within the dispensing chain-- berso as to break up any lumps which may be*thereinandmaintainthe same as much as poss'ible of -un'i-form"consistency, which uneans "are also preferably combined with a wiper whereby any accumulations of lumps l or hard material on theaerterior of thescreen or strainer may be removed therefrom and -tlius prevent the latter from being clogged and 'insteatl maintained in an efficient and serviceable condition. hr the preferred construction of this comb-med stirrer or mixer and wiper "the same comprise-s a horizontal ring 23 which has' its periphery arranged close to the bore of the chamber and is adapted to be raised--and;lowered in th-e -dispens'ing chamberand to move into and out of the space between the bore of this chamber and the periphery of the tubular screen, this movement being preferably imparted to this agitating or dasher ring 23 by means of an upright shifting rod 24 passing through a stuffing box 25 arranged centrally nipulated. In order to permit of. cleaning the outer side of the screen from any lumps or incrustations which may have accumu- I lated thereon a ring-shaped wiper 29 of rubber or other suitable flexible material is mounted on the da'sher in position to engage with the peripheral surface of the tubular screen. In the preferred form this wiper ring 29 is arranged on the underside of the dasherring 23 and is held in place thereon by means of a retaining ring 30 engaging the underside of the wip'erand connected with the dasher ring by 'meansof screws 31 which latter upon being tightened operate to clamp the wiper 29 between the rings 23 and 30 and hold these parts securely in position relatively to each other. Upon raising and lowering thedasher the'annular wiper 29 slides'up and down over the peripheral sur face of the screen and brushes therefrom any lumps or similar particles therefrom, thus keeping the openlngs or meshes of the screen clear and unobstructed. and permitting this strainer or screen to be maintained constantly in its most efficient condition.

In the modified construction of this invention shown in Figure 3 the pressure reducing valve 15 is of slightly different form and arranged at the side of the dispensing tank or chamber instead of at the top thereof and the upper head 6 has its inlet '7 arranged in a slanting portion 7% of this head. In the construction shown in Figure 3 the lower head 5 of the dispensing chamber. is pro-- videdwith a depressed p'ocket32 whichirecei-vcs the elbow 19* whereby :the ou-tlet of the-dispensing chamberis connected with the delivery hose 10.1 The screen in the con struction shown in Figure 3 extends overithe topof the pocket 32 so as to prevent any lumps or large particlcsof paste from reach-' i11 the delivery hose or tube 10. This screen in the preferred construction bears against an annular shoulder 33 at the upper end of i the pocket 32 and is'held in place thereon by means of a-clamping'ring 3a: which is connected by nieans of screwsf35rwith th'e lower line mesh and this in turn is supported on lts upper and lower sides by screen layers 37, 38 of coarse mesh thereby securing the screening effect of the fine mesh section and the strength of the coarse mesh section.

In this modified form no special means are provided for agitating thepaste within the dispensing chamber or clearing any lumps from the upper surface of the screen but this can be accomplished by any suitable manner.

head. In orderto renderthis-scren most' effectlve the same consists of a layer 36 of i By the-use of this'apparatus for dispensing paste or viscous material the waste of paste is practically eliminated andgreater efliciency is obtained in theapplication of paste to the cores and mold partsand this is accomplished with greater ease and facility therebyv materially reducing the cost of doing this work.

By the use of the agitator, dasher or mixer a uniform mixture is insured, especially if a refractory substance, such as graphite ismixed with the paste and it also insures a uni-- form, smooth and free flowing paste which permits of connecting the cores and sections of a mold most eificiently.

When using this dispensing apparatus the application of air pressure to the interior of the dispensing chamber does not cause the paste to be discharged from the nozzle 12 in the form of a spray or atomized paste but instead the paste issues from thisnozzle in the form ofa small ribbon or viscous stream of paste, the rapidity of the discharge being wholly under the control of the hand operated discharge valve 11.. By the use of this apparatus an operator can easily attain a speed much greater than that attained by the hand methods heretofore in use. Ihe paste does not dry out, the operator only applies what is necessary which re-.

sults in a substantial saving in thematerials of which the paste is made. Furthermore the enclosure of the paste at all times within a container prevents the creation of any odors and therefore avoids attracting any flies. a I

When this dispensing apparatus is in daily use it does not become clogged or plugged up. The same owing to'itssmall size is .f. portable and can be readily transported from one (place to another and a single installation can readily do its Work Within a radius of forty feet without impairing its efiiciency. Furthermore the apparatus permits of laying the paste on the cores and mold sections terial comprising a chamber adapted to contain viscous material and provided in its top with a filling opening for introducing thevlscousmaterial and an inlet for a pressure medium and provided in its bottom withfa lower opening, a plug secured insaid lower opening and having an outlet vfor the viscous material, a screen having an upright perforated tubular body secured at its lower end to said plug and having its interior communicating with said outlet, a circular stirrer arranged around the tubular body and movable vertically relatively thereto and having its periphery arranged close to the boreof said chamber and a circular wiper secured to said stirrer and engaging the periphery of said tubular body. I V

In testimony whereof I afiix my signature.

GEORGE H. BOWERS.

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