US939392A - Dough-mixing machine. - Google Patents

Description

0. CHAMBERS, JR. DOUGH MIXING MACHINE. 7 APPLICATION FILED OCT. 4, 1905 939,392 Patented Nov. 9, 1909.

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U. CHAMBERS, JR. DOUGH MIXING MACHINE. APPLICATION FILED 00124, 1905.

Patented Nov. 9, 1909.

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0. CHAMBERS, JR. DOUGH MIXING MACHINE. AiPLIOATION ruin) 0014, 1905.

Patented Nov. 9, 1909.

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Patented Nov. 9, 1909.

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00 I 00 v. OO- B w 0 m WI TIMES-9E5 To all whom itwiay concern:

UNITED STATES PATENT OFFICE.

cymrs CHAMBERS, an, or ovnmmoox, PENNSYLVANIA.

' noueraivnxrne MACHINE.

Be it known thatI, CYRUs CHAMBERS, J r., a citizen of the United States, residing at 'Overbrook, in the county of Montgomeryand State of Pennsylvania, have invented a new and useful Dough-Mixin Machine, of which the fol-lowin 1s a ,speci cation.

' My inventionre ates toimprovements in machines for. mixing dough, and comprises means whereby fiour is sifted lightly and automatically into the liquid, such as yeast, milk and water, means whereby the sifted flour is drawn lightly and without material pressurethrough the liquid, and means whereby the mixture is then aerated by being pulled apart in the air above the liquid.

'By this operation the flour particles are each completely .enveloped in moisture, and

held in light contact with one another so that theyv may fully expand and develop.

My invention comprises improvements. in

the device described in patent to L. C.

Sharpless N 0. 710,619 dated Oct. 7, 1902. I

My object has been to reduce the cost of manufacture of the machine; to improve its to prevent waste of flour; to provide means whereby the machine may be ,quickly and easily taken apart and put together; to provide means whereby the machine may not be put together wrongly; v to provide means whereby. the machine may be readily cleaned and whereby it may be made strictly sani tary; to provide means whereby the required work of the machine maybe performed in the least possible time whereby an improved quality of bread is produced at minimum labor. 7

. My invention comprises means connected with the bottom of the air chamber for preventing endwise movement thereof; the re duction of the diameters of the shafts with respect to the width of the blades; the relatively increased diameter of each shaft at "leak of material between the shafts and their journal boxes; means at the ends of the shafts distant from the gear end to secure their proper positioning; means for securing the proper relative association of the gear wheels; improved means for adjusting the position of the thermometer; and means connected wlth the supporting feet for pro- Specification of Letters Patent. Application filed October 4, 1905. Serial No. 281,256.

Patented Nov. 9, 1909.

ducing a yielding, frictional contact with the surface upon which the machine may rest, said tread having such characteristic that it will be slightly elastic, fire proof, impervious to water, andnonshrinkable with age.

Referring to the drawings i.Figure, 1 is an elevation of my device. Fig. 2 is a crosssection on line 2, 2 of Fig. 1. Fig 3is a plan view of' the basin with the superimposing structurc removed. Fig. l is aplan view of the sifter. Fi 5 is a longitudinal vertical section on line 5.,5 of Fig. 4,..the middle portion being broken away to economize space. Fig. 6 is a side elevation of the spring catch. Fig. 7 is a horizontal section of the thermometer shield and fastener. Fig. 8 is an elevation of the connecting rod catch. Fig. 9 is a vertical section on line 9', 9 of Fig. 8. Fig. 10 is a right hand e'nd elevation. Fig. 11 is a left hand end elevation. Fig. 12 is a perspective view of the thermometer calibrating device. Fig. 13 is a section of sifter shaft through yoke slot.

Fig. 14; is a fragmentary vertical sectional tary view of the interior. end elevation of' sifter hopper. Fig. 16 is a fragmentary Fig. 17 is a sectional view of the spring catch in the preliminary locking position. Fig. 18 is a fragmentary view of the gear end of a mixing shaft. Fig. 19 is an end elevation of Fig. 18. I

Similar numerals refer to similar parts throughout the several views.

My device comprises the basin portion 1 with the air chamber portion 2 detachably connected therewith. The air chamber portion 2 is open at the top and is adapted to have seated in said opening the sifting ho per 3'. Between the basin 1 and the air chamber member 2 are located. the journal boxes for the shafts 4 and 5, provided with the sets of mixin blades 6 and 7 respectively. These sha tsare connected with the cooperating gears 8 and 9, operated by the handle or winch 10, so that said shafts will be rotated in opposite directions as indiview of one end of the bottomv of the sifter.

winding of the dough around said shafts,

. which is frequently the case in dough mixers now in common use. By preventing the dough from adhering to and winding about the shafts it is obvious that a more thorough mixture of the dough is secured, since the blades of one shaft in moving upward past the opposite shaftlift the dough out of the liquid and drag it away from the shaft and carry it-up into the air chamber, where it is drawn apart by the now separating blades.

The mixing blades are so arranged that the end ones on both shafts, next to the ends of thebasin, operate in the same plane so as to mix the dough clear to the end of the basin on either side. For this reason the shafts must be properly associated, that is geared relatively, so that these blades shall not interfere with one another. As these shafts are frequently removed from the bearings, it is desirable to provide means whereby the inexperienced can and must replace them.

Trigo'rder that the two gear wheels 8 and 9, which are cast integral with the shafts el. and 5 respectively, may always be so meshed as to allow these extreme end knives to pass one another, that is without interfering with one another, I have provided a projecting rim 11 on the gear wheel 9 upon which the winch is cast, with a notch in it preferably of the width of two teeth in the gear wheel. ()n the side of wheel 8, I provide a projection 12, two teeth in width, extending beyond the length of the teeth so as to enter into the notch previously described, whereby when the wheels are properly meshed the projection 12 will enter the opening in the rim ll of wheel 9. Thus it will be seen that only when the wheels are meshed in the proper relative positions, rim 11 and projection 12 will not interfere. in any other relative positions .of said gears, the projection 12 will strike rim 11 and iii-- terfere with the operation of the machine, thereby warning the operator that themw chine is not properl assembled.

The ournal boxes and the shafts rotating thereii'i are constructed and proportioned relatively so as to prevent improper assemblingofjthe various parts, and so as to reinforcehthe operativeqparts approximate the point'of greatest strain, and so as to prevent the leak of materialbetween .said shafts and surrounding.journal boxes as will be more particularly described below.

The air chamber member 2 is provided with outwardly projecting lugs 28 which in turn are provided with downwardly proj ecting lugs 40 (see Figs. 1, 6, 10 and 17) to emproperly ing upon the air chamber.

brace the upper margin of the basin member 1, to sccure perfect adjustment of said two members and to prevent end movement. thereof. These lugs ell) project bilow the basin joint and beyond lheline thereof, so that they lap down over the basin under the lugs 28, whereby they are hidden from view. The faces of lugs -10 which engage with the basin, are chilled and are thus made to lit accurately without additional machine work, and. without. interfering with the chilling ol the contacting surfaces of the chambers. The upper edge of chamber 1 and the lower edge of chamber 2 which come into engage ment with each other, are cast with chilled surfaces to secure a substantially tight, nonleakable joint between said two chambers, without further planing or nuichine work. Improved spring catches are also provided to maintain ellicienl engagement between said basin member 1 and air chamber meanber 52, which catches shall luu'einal'lcr be described in detail.

The top of air chamber 2 is open, and adapted to receive the sifter hopper 3. This sifter hopper 3 is a separate chamber readily removable from the top of the air chamber It is provided with flanges 21 at each end loembrace the ends of air chamber 2 and to prevent endwise movement. Those flanges 21 also serve as supporting leelv for the siftcr hopper when the same not restbpring calchcs are also provided to lock the siitcr member upon the air chamber member in thc opcralive position. Sifter hopper C5 is provided with the perforated bottom 32. The shall i is journalcd in the opposite ends oil said sil'lcr hopper. The oscillating yoke or mix ing member lei: has an intermediate horizontal. extension with its two ends at right angles therewith; said ends being movable in transverse slots in shaft 18 the angles of the yoke or mixing member between ilic vertical parts and the intermediate horizontal part are squared out, as shown in Fig. 1-1, so as to insure the dislodgment of' the llonr close to the head of the siflcr hopper. Shall 13 is connected by crank 15 and connecting rod 16 with the gear 8 whereby an oscillating movement is given thereto, causing the sitter yoke to sweep with oscillatory movement the perforated curved bottom 32 of the sifler hopper El. The connecting rod 16 is provided at each end with the apert'irc 25$) for receiving the wrist pin of crank 15 and the wrist pin on gear wheel 8. Secured to the edge of the connecting rod 16 is the gravity actuated gate 4-1, provided with the slot through which passes the screw 37. The wings or projections 41 extend on either side ol the rod 16, and form a channel therefor. At the lower end of the gate ll is the horizontal projection or lug These gates are of metal and have a free movement, with reill) lllil spect to the connecting rod 16, limited by the extent of slot 38 through which screw 37 passes. In engaging the rod with the wrist pins it is simply necessary to place the edge of the connectingrod against the wrist pin and slide it downward. lVhen the wrist pin *of shaft 13 are provided the semi-circular projections 17 which serve as bearings for takin the end thrust of the Sifter shaft 13,

and a so the side thrustof the yoke or mixing member 14. The pressure of projection 17 on the side of yoke or'mixingmember 14 forcesthe yoke down at the opposite end, so as to keep it in contact with the perforatedbottom of the sifterhopper. The shaft 13 base vibratory motion imparted to-it,

Qwhich causes it to move up and down in its journal boxes provided there be any lost as 1 'boxes.

motion between said shaft and its journal This serves to pump the flour out through the journal boxes. To prevent this objectionable condition I. provide at the oppositeend of the shaft from that to which the crank is secured, a journal box closed at its out-erend so that no leak is possible there- -through. This structure is indicated at 18 in Figs. 1 and 4.' Atthe crank end of the shaft I project the journalbox beyond the face of the sifter head and provide a recess 19 in the hub of the crank to receive said.

box, as indicated in Fig. 14 whereby the course of the flour is out through the box over the end of the box between it and the side of the crank and'back over the box and within the recessed hub of the crank, thus making a clrcultous route for the flour to pass, this will serveto take up the leakage and practically prevent. the escape of the our.

Each head or end of the sifter hopper 3 has cast upon it two inwardly projecting lugs 20, opposite the feet 21, and which are adapted to rest upon the upper curved edgeof the air chamber member 2. These lugs serve to maintain the sifter hopper 3 in its' proper position with respect to the air chamber, up and down as well as SIClCWlSG.

' fllhe longer feet 21 extending downwardly over the outer ends of the air chamber pre-- vent endwise 'movement between hopper and air chamber.

The lugs 20 also serve to bring the perforated plate of the sifter to its exact position relative to the sifter heads, and to keep it 1n position while soldering, there being recesses cut in the perforated metal to receive said lugs as shown in Fig.

16. The perforated bottom' 32, it will be seen, passes'benea'th the ends or heads of the si-fter hopper, the perforations extending the strain in turning the crank,

entire length of said hopper, so that the flour will be sifted to the extreme ends of .the mixing chamber. The upper end of the air chamber upon which rests the sifting chamber is bent outwardly so as to catch any flour that would otherwise lodge upon theupper edge of said air straight. 1

The spring cat ch used to lock the various parts ofthe machine together has the following novel features of construction. As these catches are all similarly constructed, a description of one will sufiice for all.

Referring to Figs. 6 and 17 the U-shaped spring 25 is pivotally secured by pivot 30 to a fixed lug on one of the members of the machine, say the basin member 1. The other end of-the spring 25 is secured by pivot 29 to acam member 24 provided at its upper'end with a ring 52 for convenience in chamber, were it manual operation. Cam member 24 is also provided with a projecting point 26 and a projecting horn 27.

Referring to Fig. 17 member 24 is thrown into what may be termed a preliminary locking position. When member 24 is lifted upwardly toward lug 28 of member 2, the

projecting horn 27 encounters lug 28, until the projecting point 26, engages the upper side of said lug 28. The further tilting movement of member 24 causes the throwing of said member24 over the center, that is,

over the line of strain between said pivots 29 and 30 with respcctto point 26, in the position, shown in Fig. 6. The horn 27 is at the same time carried away free from engagement with lug 28. The ring 52 will restjagainst the vertical wall of member 2.

.By this construction it will be seen that there is no rubbing or friction between point 26 and lug 28, and therefore'no possibility of wear which is. so often an objection to spring catches of this general character. It is obvious that when the member 24 is thrown over the center as above described, it will remain in such by the tension of spring 25, until said member 24 is again manually operated to move in the opposite direction over the center into the unlatcliing position. The side projections 24 on member 24 are adapted to encounter the springs 25 to prevent the member 24 from upsetting or falling too far back. lVithout this it the born 27 to miss the lug 28 in bringing the catch to the closed position.

On the near end and on the near side of the air chamber 2 is provided the handle 53 would be possible forv position, being so held for the purpose of enabling the operator to steadv the machineon the table while operating it, and l d take the reaction of the whereby not but the operonly is the machine steadied by the action and reaction ator steadied also,

of force required to -work the", machine.

This handle is secured by a bracket 54 cast upon the near head of the air chamber ex tending out far enough to receive the end of thehandle which handle is far enough from the side or" the air chamber to admit. of the hand going between the handle and the air chamber. The other end of the handle is supported by a small 1) 'acket secured to the side of the air chamber near the middle thereof as shown in Fig. 1.

To prevent leakage around the journals of the mixing shafts I close the outer end of the boxes opposite the gearing on the shaft, by placing over the end thereof a cireular plate, one-halt oi which is preferably formed integrally with the basin member the other half with the air chamber member. so that when the two are brought together the opening is entirely closed. These closed journal boxes are'indicated by the numerals 5G and 57 on Fig.3. I To 'irevent the endwise slip of the shafts in their journal boxes T provide the collars 5S and 59 inside the chamber at the. end approximate the gearing, as shown in Fig. 3, and also in Fig. 18. These collars also serve to prevent the moisture and dough from working out through the journal boxes atthe gear ends of the shafts.

I provide the following improved means for securing a thermometer to the basin member so that the same may be properly calib 'ated whether the mercury stands normally below or above the position i have indicated as required for bread making. This thermometer 33 is secured in the recess formed by the surrounding flange 35. see Fig. 11. l provide a piece 0t sheet metal it see Fig. 12, having a vcrti ally extending portion, provided with series of holes 17 to receive the hook oi the thermtmictcr tube. 33. From the vertically extending portion of piece 46 extend a pair of horizontal arms 48 adapted to wrap around the thermometer tube once and then engage in suitable apertures or recesses in the flange 35.

cure the thermometer tube to piece '1-0. The strip 3%; engaging in suitable rcce. es or apertures in flange 35 serves to maintain the lower end of the thermometer tube in position. The range of temperature within which the yeast plant will best develop shown by the indicatitm marks 941 b, and ,l, see Fig. 11. The series ot'holes 47 afl'oi'dv means for shifting the position of the thermometer tube vertically with respect to the indication marks on the basin, in calibrating. v

The basin member 1 is provided with the supporting legs 13 having treads 415 which have the characteristic of being slightly elastic, heat: resisting, impervious to water and nondeteriorating with age, and which shall produce a frictional contact with the table A second set of, shorter arms 19am provided to further seupon which the machine may rest. After a careful study of such substances as I was familiar with, and many experiments among which were rubber bumpers, wooden bump ers, asbestos bumpers, fiber and rubber bumpers, I found by many teststhat common cork came the nearest to fillin all. the requirements. It is elastic, it is comparatively impervious to water, it resists a higher temperature than many of the other materials enumerated, without being injured. It does not shrink or otherwise deteriorate with age, and yet otters a frictional resistance to the table, thus fulfilling all the requirements. This cork is attached to the foot by casting a dovetailed circular recess 44 in the body of the foot, and compressing therein cork treads 4-5 which are cut conically, compressed by a. machine, and forced into the recess, where the cork expands, filling the inner and larger end of same, and projecting out to form a cushion tread for the foot. I find that this is a. very valuable improvement in making the machine silent when set upon the table, and greatly steadying it in the operation oiiturn- The operation of my device is as follows: Before assembling the various elements, the basin member 1 or liquid chamber is supplied with a suitable quantity of liquid such as water, milk and yeast. The various ele ments are then assembled and flour is supplied to sitter hopper 23. The handle 10 is turned in the clockwise direction as indicated by the arrow in Fig. 10, this being the natural direction of rotation. By turning the handle in the clockwise direction, the mixing blades are turned in the direction ind' rated by the arrows in Fig. 2. That is, the blades. in the lower position approach each other and separate only'in the elevated position. Assuming that the liquid in basin 1 stands at a level about half way between the top and bottom of basin 1, the blades (3 and. 7 will approach each other beneath the level of the liquid, meeting at a point considerably below the surface-thereof and separating entirclyabove the surface of the lit uid in the atmosphere of air chamber 2. This insures an etiicient mixing of the flour with the liquid and by pulling it apart in the atmosphere above the liquid the same is thoroughl aerated in the atmosphere of the air chamber. Fresh air is being constantly supplied to air chan'lber 2 through the open spaces between the sitting hopper 3 and the top of air chamber 2.

\Vhile the blades are being rotated as above described, motion is communicated from gear 8- to crank 15, to rock shaft 13 and siftcr bar 14, so that the relation of inovementbetween sitter bar and mixing blades is always constant, that is, the faster the blades rotate the faster the sifting bar oscillates, so that the faster the mixing takes place the faster the flour fed to basin 1.

The; formation of the bottom of basin 1,

that is,the intermediately disposed ridge 1,

- togethen so that the blat es will carry the m1xin and aeration of same upwardly out' of'the liquid and pull or shred it apart in the atmosphere of air chamber EZ.

By providing the required predetermined quantities of liquid and flour, the thorough the dough is practic'a lly automatic, and always uniform.

the above described mechanism the flour; is sifted lightly and automatically intipthe liquid. It is then" drawn ,lightly f itho'utmaterial pressure through the liqu vbythe mixing blades. It is then lif e goutfof the liquid and pulled apart by the,iippositely moving mixing blades in ,the air chamber above the liquid and thereby aerated. By this operation the flour particles-are each completely enveloped in moisture, and held in light contact with one another, so that they may fully expandand develop. When the dough is sufliciently mixed, the various parts of the machine are separated, the shafts removed, and the dough clinging to the shafts and mixing blades is scraped back into the basin 1. The lug l2,

proyided witlr a depression in its upper sur- 3 rac'eg" i s ja eonvenient means for supporting ond'eridbfhthe shaft while the operator holdsi the {other end, during Lhe scraping operation. The dough thus contained in the is then suitably covered and set aside, nan enveloping atmosphere .of proper temperature, indicated by the thermometer, until saiddough has sufficiently risen.

I tjlisgto be noted that the thermometer is clampedagainst the outside of the metallic basin 1.. It is exposed to the outside atmosphere, that is the atmosphere enveloping theysaid chamber. Being in contact With the "basin, the metal of which being a good conductor, it is distinctly affected by the temperature of the dough. It\ therefore serves to register not the temperature of the enveloping atmosphere alone, nor that of the, dough alone, but indicates rather the combined effect of contents of basin and. en-

velopingatmosphere, which enables the operatorto secure much more uniform results.

What I. claim is 1. a dough rnixing'nmchine, the combination of a mixing vessel and mixing mechanism therein, said mixing mechanism comprising a pair of parallel rotatable shafts provided with interdigitating mixing blades extending-nearly the distance between said shafts,-said blades integral with their supporting shafts and having their transverse extensions adjacent the shaft greater-than the shafts diameter and a filleted omder beand separate in the tween-blade and sliaft, as and pose specified.

2. In a dough mixing machine, the combination of a mixing vessel, a pair of cooperating mixing elements operating therein, said elements comprising parallel shafts, each with radiating blades spirally arranged, the blades having enlarged shoulders adjacent the supporting shaft and tapering toward the outer ends to facilitate carrying the dough upwardly and tearing it apart in the air.

3. In a dough mixing machine, the combi: nation of a liquid containing basin, tyvo sets of mixing'blades operating therein, means for moving one set of blades toward the other beneath the liquid and for causing the for the purmovement of one set away from the other.

above the liquid, means for sifting flour automatically into the liquid, the proportion, position and operation of the mixing blades being such as to draw the flour 1i htly through the liquid and. then lift the'i'esu tant dough out of the liquid and away fromthe blade actuating means and then pull it apart in the air above.

4. In a dough mixing machine, the combination of a liquid containing basin, a pair of parallel shafts, each provided with mixingblades wider at the shaft, than the diameter of the shaft, said width being in a direction transverse the axis of the shaft, and means for moving the shafts simultaneously so that the blades of one shaft will approach the blades of the other beneath the liquid,

air above the liquid.

5. In a ClOLI 'h. mixing machine, the combination of a liquid containing of parallel shafts,-each grovided with mixing blades set transverse the shaft end than the shaft diameter, means for moving the shafts simultaneously so that the blades of one shaft will approach the blades of the other beneath the li aid and separate in the air above the liquic, means for sifting flour into the liquid eontainin basin, and means for coupling the operation of the sifter and rotating shafts.

6. In a dough mixing machine, the combination of a pair of mixing shafts provided with mixing blades, the blades narrow in direction of the axes of the shafts and broad transversely and adjacent the shafts, and tapering thereto and therefrom, as and for the purpose specified.

- 7. In a dough mixing machine, the combination of a basin member and an air chainbasin, a pair y thereto Wider at ber member adapted to superimpose the;

basin member forming a single chamber, the

upper edge of the, basin and the lower edge of the air chamberwhich engage with each other, being cast with chilled surfaces. to form a substantially tight nonleakable joint between said members, and lugs projecting from one member to overlap the sides of the other member to secure proper cooperation of said chilled surfaces.

8. In a dough mixing machine, the combination of a pair of mixing shafts provided with mixing blades, the blades narrow in direction of the axesof the shafts and broad transversely and adjacent the shafts, and filleted at'thc junction with the shafts.

9. In a dough mixing machine, the combi nation of a basin member, a pair of shafts having mixing blades, coiiperating gear wheels connected with said shafts, the jourpalcd portions of the shafts at the gear ends thereof having diameters greater than the diameters of the extension of the shafts between their journals.

10. In a dough mixing machine, the combination of a basin member and an air chamber member adapted to be disengageabl joined together to form a single substantially non-lealrable chamber, a pair of shafts having "adially extending blades, split journal boxes for said shafts formed between the basin and air chamber members, said journal boxes closed about the ends of the shafts at one end of the chamber, the shafts projecting through the journal boxes at the other end of the chamber, and provided with collars inte ral therewith adjacent the last mentioned ournal boxes to prevent longitudial movement and also to prevent leakage.

11. In a dough mixing machine, the combination of a basin member, a pair of shafts provided with mixing blades, journal boxes for said shafts, the shafts at one end and their corresponding journal boxes having a diameter less with respect to one, and greater with respect to the other, than the diam eter of the main portion of said shafts, to prevent interchanging of the shafts with respect to the journal boxes.

12. In a douglrmixing machine, the combination of a basin member, and an air chamber member disengageably connected together, one member provided with lugs adjacent the other member, spring catches cooperating with said lugs for securing said members together, said catches comprising a spring pivotally secured to one of said members, a cam member pivotally secured to the spring, said cam member provided with a projecting point and a projecting horn approximate thereto, the said parts being proportioned and associated so that the cam member shall have a spring controlled, overthc-center frictionless engagement with its cotiperating lu 13. In a dough mixing machine, the combination of a basin member, and an air chamber member disengageably connected toether, one member provided with lugs adjacent the other member, spring catches cooperating with said lugs for securing said members together, said catches comprising 1'. spring pivotally secured to one of said members, a cam member pivotally secured to the spring, said cam member provided with a projecting point and a projecting horn approximate thereto and a side projection for encountering the spring to prevent upset ting, the said parts being proportioned and associated so that the cam member shall have a spring controlled, over-the-center frictionless engagement with its cooperating in".

1st. in a dough mixing machine, the com bination of a basin member and means for. mixing the material therein, a sifter hopper for delivering to the basin member having an oscillating yoke and a shaft for actuating the same,and projections on the heads of the hopper engaging the upper extensions of the yoke, as and for the purpose specified.

15. In a dough mixing machine, the combination of a mixing basin and mixing mechanism operating therein, a sitter hopper for delivering to the basin, a sitter member in said hopper, having an internisdiatc horizontal extension and end eaten; sions at right angles thereto, a shaft for en.

engagu'ig said sifter member and operating.

the same, said shaft provided with apertures for receiving the end extensions of said sil'ter member and projections provided on the inner sides of the hopper heads for engaging the ends of the Sifter member above the shaft for taking the side thrust of the sitter member.

it). In a dough mixing machine, the combination of a basin member and. Sifter hopper for delivering thereto, the sifter hopper comprising end members or heads, and a connecting sheet metal portion forming bottom and sides, the bottom part being perforated throughout its extension, and recessed at the ends, the heads provided at their lower sides with lugs for coiipcrating with the recesses in the perforated bottom to facilitate in assembling said parts.

17. In a dough mixing machine, the combination of a basin member and a sitter hopper for delivering thereto, the sitter hopper comprising end members or heads, and a connecting sheet metal portion forming bottom and sides, the bottom part being perforated throughout its extension, and rcccssed at the ends, the heads provided at their lower sides with lugs adapted to serve as supporting feet to said hoppen 19. in a dough mixing machine, the combination of a basin member, a pair of shafts with mixing blades operating therein, the endblade of each shaft traveling in the same plane, gear wheels for causing the rotation of the shafts in opposite directions, and reccss and projection mains, connected with "aid gear wheels, for insuring their proper relative association.

19. In a dough mixing machine, the comteaser;

venting end movement with respect to thebasin member, springcatches for disengage ably securing said two members together and a handle secured to the air chamber member to take the reaction of the strain the machine,

20. In a dough mixing machine, the combination of a mixing basin, mixing mechanism operating therein, a handle and elastic, non-deteriorating, heat resisting treads, associated with the basin and forming cooperating means in connection. with the operator and the table supporting the basin for steadying it and maintaining its position, during the operation of the mixing lDfiClltlJllSl'il.

21. In a dough mixing machine, the combination of: a basin member, a handle thereon, Winch operated mechanism for mixing dough in the basin and supporting feet for the basin member having cork treads as and for the purpose specified.

22. In a dough mixing machine, the co1nbination oi? a basin member, an air chamber member disengageably connected therewith,

spring catches for securing said two members together, Winch operated mechanism for mixing the dough in the basin, a handle soin operating cured to the machine. to be grasped by the operator for taking the reaction of the straln 1n operatlng the Winch, and supporting feet for the basin member havin cert: treads. I:

23. In a dough mining niiachinc having (-1ioperating crank shai ts, disengageable means for o ieratively comiecting the same, com 'niaing a connecting rod recessed at each end and provided with gravity actuated gates :tor closing the recesses, said provided with shoulders to encounter the wrist pins of the cranks when bringing the rod. into position.

24-. In a dough mixing machine, comprising a mixing chamber and sifting hopper reniovably related thereto, the sitting hopper having a crank sha and a sitting bar, the niirine chamber hzwing a JRILIC shaft and mixing bind (iisen auble means for opera tii ely eonn V i! hat comprising a connectii .od r-ecesscd a each end and provided with wit :n-tnnted gates :tor closing the rccc s said gates provided with shoulders to ii'nconnter the wris.v pins of the cranks when l'nringing the rod into position.

C fit-UK C-l i Ah l 13 E88, JR.

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