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Publication numberUS3166302 A
Publication typeGrant
Publication dateJan 19, 1965
Filing dateNov 8, 1963
Priority dateNov 8, 1963
Publication numberUS 3166302 A, US 3166302A, US-A-3166302, US3166302 A, US3166302A
InventorsHarris Dixon William, John Yankivich
Original AssigneeHarris Dixon William, John Yankivich
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mixing apparatus
US 3166302 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

1965 w. H. DIXON ETAL 3,166,302

MIXING APPARATUS Filed Nov. 8, 1963 3 Sheets-Shoot 1 FIG.

WILL/AM HARRIS 0/x0- .WVENTORS' JOHN YANK/I/ICH ATTORNEY LEADING FIG. 5

FIG 2 Jan. 19, 1965 w. H. DIXON ETAL 3,166,302

MIXING APPARATUS LEADING EDGE WILL/AM HA RR/S o/xa/v WVENTORS' JOHN VANK/V/CH A TTORNEV LEAD/N6 EDGE Jan. 19, 1965 w, H. mxoN ETAL 3,166,302

MIXING APPARATUS Filed Nov. 8, 1963 3 Sheets-Sheet 3 WILL MM HARRIS 0/x0/v JOHN m/vK/v/ch' A T TORNE Y Filed Nov. 8, 1963, Ser. No. 322,455 3 Claims. (Cl. 259-108) This invention relates to the mixing of mortar, and in particular to a portable mixer for mixing cement for drywall construction. I

So-called dry wall or plasterboard construction has become an increasingly widespread method for finishing the interior walls of buildings. This kind of construction is typically performed by securing drywall sections to the studs or members that define the location of the wall, taping the seams between adjacent drywall sections, and finally plastering or cementing the taped seams to obtain a wall surface having a smooth,.unbroken appearance. The final cementing or plastering of the taped seams is of utmost importance to the finished appearance of the wall, since any imperfections in the cemented seams are readily noticeable. For this reason great care must be exercised in preparing the drywall cement. The cement must be mixedin clean containers and ina most thorough manner to eliminate insofar as possible both foreign particles and unmixed cement particles which would mar the final appearance of the wall. 7

However, the proper mixing of drywall cement presents several problems. In the first place, the cement cannot be prepared in large quantities in advance and stored, but

must be mixed in relatively small quantities on the job as needed in order to obtain fresh cement of the proper quality and consistency. Second, thorough mixing by hand is time consuming and inefiicient. Third, electric power is not always available at remote construction sites for the employment of electrical mixing tools. Finally. and most important, although there are a number of well known portable devices for mixing mortar, for example, see F. 0. Skoog Patent 1,593,706, issuedluly 27,1916, and C. I. Tincher et a1. Patent 3,061,284, issued October 30, 1962, none of them has been found to be suitable for mixing drywall cement in relatively small quantities with the degree of thoroughness necessary to eliminate virtually all unmixed cement particles.

The present invention provides a portable mixer especially adapted for mixing drywall cement efficiently, thoroughly, and in relatively small quantities. Further, the portable mixer of the present invention is sufficiently light in Weight and small in size so that it may be easily transported by a single man, and it is powered by a small gasoline engine so that it may be employed at construction sites remote from sources of electrical power.

In order to obtain thoroughly mixed drywall cement, this invention also provides a stirrer especially adapted to mix thick, heavy mixtures of relatively high viscosity. There are a number of well known stirrers available, but as in the case of the paint stirrer described in R. Conley Patent 2,753,162, issued Iuly 3, 1956, the prior art stirrers are generally not capable of mixing cement with the thoroughness required in drywall construction.

The stirrer of this invention is provided with two pairs of vertically spaced horizontal blades oriented in opposite directions on either side of a vertical shaft in order to agitate cement particles lying in strata at the top and bottom of the container and to direct cement particles in these strata toward the center of the container. Further,

United States Patent the stirrer is provided with two pairs of horizontally "ice particles at the center of the container; and an outer pair of vertical blades secured to the horizontal blades and oriented at a predetermined angle to direct cement particles from the walls of the container to the center of the container.

The invention will be fully understood from the followingdetailed description, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of portable mixing apparatus embodying the principles of this invention;

FIG. 2 is a front elevation view of the stirrer of this invention;

FIG. 3 is a side elevation partially in section of the stirrer illustrated in FIG. 2; a

FIG. 4 is another side elevation partially in section of the stirrer shown in FIG. 2; and

FIG. 5 is a bottom plan view in section of the stirrer shown in FIG. 2.

Referring first to FIG. 1, this drawing illustrates a complete portable mortar mixing apparatus embodying the principles of the present invention. A conventional gasoline engine 1, for example, an engine of about two horsepower, is secured to and supported upon a horizontal base plate 11, and the output shaft of engine 1 is connected by drive wheel 2, belt 3, and pulley wheel 4 to the input shaft of a speed reducing mechanism 5, which may be a worm and gear reducer of conventional design. Reducer 5 is also secured to platform 11, and the output shaft of reducer 5 extends vertically through platform 11 to chuck 15 which is connected to the vertical rotatable drive shaft 18 of the stirrer 17 of the present invention.

It has been found that a suitable rotation speed for stirrer 17 is on the order of revolutions per minute, so that the ratio of reducer 5 and the relative sizes of drive wheel 2 and pulley wheel 4 are selected to convert the speed of engine 1 to this desired speed of rotation; for example, if engine 1 has an output speed of 3,600 revolutions per minute, reducer 5 may be selected to have a ten to one speed reduction ratio, and drive wheel 2 and pulley wheel 4 may be chosen to effect a two to one reduction ratio in order to obtain an overall twenty to one reduction ratio, thereby to drive stirrer 17 at a rotation speed of 180 revolutions per minute.

The complete mixing apparatus described above is sufficiently light in weight that it may be lifted by a single man by means of handles 10a. However, the mixing apparatus may be employed in a stationary position by placing the apparatus upon a suitable portable stand 12 provided with legs 13 of appropriate height for inserting stirrer 17 into container 16 at the proper level: It is observed in FIG. 1 that stand 12 is substantially narrower than platform 11 in order for chuck 15 and vertical shaft 18 to move freely. Also, in order to prevent motion of the mixer on stand 12 due to engine vibration, one or more pairs of mating studs 14a and holes 1412 are respectively provided in stand 12 and platform 11.

In order tooperate the mixing apparatus, the engine 1 is started and the stirrer 17 is lowered into cylindrical container 16 within which there has been previously placed cement ingredients in the desired and appropriate proportions. By depressing the engine throttle (not shown), the automatic engine clutch (also not shown) is engaged, thereby rotating stirrer 17 through the linkage described above. After the cement in container 16 has been thoroughly mixed, the stirrer 17 is stopped by re leasing the engine throttle, the mixer is lifted to raise stirrer 17 out of container 16, and,container 16 may then be carried to any desired location.

Turning now to FIG. 2, this drawing illustratesthe structure of the stirrer of this invention. It is to be noted at this point that the structure of the stirrer of this invention is specifically designed for mixing drywall cement areasee in a cylindrical container of substantially uniform diameter, as shown by container 16 in FIG. 1.

At diametrically opposite points on the lower end of vertical shaft 18 are welded or otherwise secured a pair of horizontal blades 23a and 23b, and in coplanar, vertically spaced relation from the lower end of shaft 18 another pair of horizontal blades 24a and 24b are also welded at diametrically opposite points on shaft 13. Horizontal blades 23a, 23b are respectively secured to shaft 13 at relatively small angles of equal magnitude but opposite orientation, for example, '10 to 20 degrees is a suitable magnitude, so that the leading edges of blades 23a, 23b are inclined toward the upper end of shaft 318, as shown in F168. 3 and 4, thereby directing cement particles from the bottom of the container to the center of the container. Similarly, the pair of horizontal blades 24a, 24b is also secured to shaft 18 at a small angle so that the leading edges of blades 24a, 24b are inclined toward the bottom of shaft 18, thereby directing cement particles from the top of the container to the center of the container.

Between each of the pairs of horizontal'blades there is secured, for example, by welding, two pairs of vertical blades in spaced relation to each other, an inner pair of vertical blades 22a and 22b, and an outer, pair of vertical blades 21a and 21b. As shown in FIG. 5, each of the inner vertical blades 22a, 22b is parallel to and offset from an axis AA passing through the center of shaft 13 and parallel to theleading edges of horizontal blades 24a,'24b, so that each vertical blade 22a, 22b is set nearer the leading edges of the respective horizontal blades 23a, 24a, and 23b, 24b, between which each vertical blade is secured. The outer vertical blades 21a, 21b are parallel to each other, and as shown in FIG. 5, each outer vertical blade is inclined at a predetermined angle with respect to a vertical plane perpendicular to plane AA, for example, at an angle on the order of 10 to 20 degrees. As shown in the drawings each of the inner vertical blades 22a, 22b is approximately equidistant from the vertical shaft 18 and the respective outer vertical blades 21a, 21b.

The arrangement of the vertical blades also contributes to the thorough mixing required for drywall cement, particularly the inner pair of offset vertical blades 22a and 22b which constantly agitate the mixture in the center of the container. This structural feature of providing an inner pair of vertical blades is indispensable for properly and thoroughly mixing heavy, dense mortars of the type exemplified by drywall cement. Also, by making the combined horizontal extension, W, of the two pairs of horizontal blades equal, there is obtained equal amounts of agitation at bothtthe top and bottom of the cement mixture in the container, thereby producing the thorough mixing required for drywall cement. By appropriately moving the mixing apparatus, the outer. pair of vertical blades 21a, 21b may be made to scrape the inner wall of container 16 to prevent the accumulation ofunmixed cement particles on the container Wall, and similarly the lower pair of horizontal blades 23a, 23b may be made to scrape the bottom of container 16 to preventthe accumulation of unmixed cement particles at the bottomof container 16.

Although this invention has been described in terms of mixing drywall cement, it is to be understood that the present invention may be used for mixing other kinds of dense cement and mortar. It is to be further understood that the stirrer of the present invention may be employed in mixing apparatus other than the above-described embodiment by those skilled in the art without departing from the spirit and scope of the invention.

What is claimed is: V

1. Apparatus for mixing drywall cement in a cylindrical container which comprises 7 a rotatable vertical shaft provided with an upper end and a lower end,

a first pair of first and second horizontal blades vertically spaced from said lower end of said vertical shaft and respectively secured at first and second I predetermined angles of equal magnitude but opposite orientation to diametrically opposite points on said vertical shaft so that the leading edges of said first horizontal blade and said second horizontal blade are respectively-inclined at said first and second predetermined angles toward said upper end of said vertical shaft, wherein the combined horizontal extension of said first pair of horizontal blades is smaller than said uniform diameter of said cylindrical container,

a second pair of third and fourth horizontal blades coplanar with said first pair of horizontal blades and respectively secured at corresponding third and fourth predetermined angles of equal magnitude but oppo site orientation to diametrically-opposite points on said lower end' of said vertical shaft so that said first and third horizontal blades are vertically spaced from one another and said second and fourth horizontal blades are vertically spaced from one another,

wherein the leading edges of said third and fourth horizontal blades are respectively inclined at said third and fourth predetermined angles toward said lower end of said vertical shaft, and the combined horizontal extension of said second pair of horizontal blades is equal to the combined horizontal extension of said first pair of horizontal blades,

a first pair of first and second vertical blades horizontally separated from one another by a spacing equal to said combined horizontal extensions of said first and second pairs of horizontal blades and secured between said first and second pairs of horizontal blades, wherein said first vertical blade is secured between said first and third horizontal blades so that the leading edge of said first vertical blade is parallel to and inclined away from said vertical shaft, and said second vertical blade is secured between said second and fourth horizontal blades so that said second vertical blade is parallel to said first vertical blade,

a second pair of third and fourth horizontally separated vertical blades secured between said first and second pairs of horizontal blades, wherein said third vertical blade is secured between said first and third horizontal blades at a horizontal spacing equidistant from said vertical shaft and said first vertical blade, and said fourth vertical blade is secured between said second and fourth horizontal blades at a horizontal spacing equidistant from said vertical shaft and said second vertical blade, and each of said third and fourth vertical blades is parallel to and offset in opposite directions from a vertical axis passing throughthe center of said vertical shaft and parallel to the leading edges of said first and second pairs of horizontal blades so that said third vertical blade is parallel to and nearer the leading edges of said first and third horizontal blades and said fourth vertical blade is parallel to and nearer the leading edges of said second and fourth horizontal blades.

2. A portable mixer for mixing a plurality of ingredients in the preparation of mortar in a cylindrical container having a uniform horizontal diameten'said mixer comprising horizontal support means provided with an upper surface and a lower surface,

a source of power secured to said upper surface of said horizontal support means and provided with an output shaft,

a speed reducing means secured to said upper surface of said horizontal support means and provided with an output shaft that extends vertically through said horizontal support means and an input shaft,

means for connecting said output shaft of said source of power to said input shaft of said speed reducing means,

a rotatable vertical shaft provided with an upper end and a lower end,

means for connecting said upper end of said vertical shaft to said output shaft of said speed reducing means, and

stirring means secured to said lower end of said vertical shaft, said stirring means including a first pair of first and second horizontal blades vertically spaced from said lower end of said vertical shaft and respectively secured at a predetermined angle to diametrically opposite points on said vertical shaft so that the leading edges of said first horizontal blade and said second horizontal blade are inclined at said predetermined angle toward said upper end of said vertical shaft, wherein the combined horizontal extension of said first pair of horizontal blades is smaller than said uniform diameter of said cylindrical container,

a second pair of third and fourth horizontal blades coplanar with said first pair of horizontal blades and respectively secured at corresponding third and fourth predetermined angles of equal magnitude but opposite orientation to diametrically opposite points on said lower end of said vertical shaft so that said first and third horizontal blades are vertically spaced from one another and said second and fourth horizontal blades are vertically spaced from one another, wherein the leading edges of said third and fourth horizontal blades are respectively inclined at said third and fourth predetermined angles toward said lower end of said vertical shaft, and the combined horizontal extension of said second pair of horizontal blades is equal to the combined horizontal extension of said first pair of horizontal blades,

a first pair of first and second vertical blades horizontally separated from one another by a spacing equal to said combined horizontal extensions of said first and second pairs of horizontal blades and secured between said first and second pairs of horizontal blades, wherein said first vertical blade is secured between said first and third horizontal blades so that the leading edge of said first vertical blade is parallel to and inclined away from said vertical shaft, and said second vertical blade is secured between said second and fourth horizontal blades so that said second vertical blade is parallel to said first vertical blade,

a second pair of third and fourth horizontally separated vertical blades secured between said first and second pairs of horizontal blades, wherein said third vertical blade is secured between said first and third horizontal blades at a horizontal spacing equidistant from said vertical Shaft and said first vertical blade and said fourth vertical blade is secured between said second and fourth horizontal blades at a horizontal spacing equidistant from said vertical shaft and said' second vertical blade, and each of said third and fourth vertical blades is parallel to and offset in opposite directions from a vertical axis passing through the center of said vertical shaft and parallel to the leading edges of said first and second pairs of horizontal blades so that said third vertical blade is parallel to and nearer the leading edges of said first and third horizontal blades and said fourth vertical blade is parallel to and nearer the leading edges of said second and fourth horizontal blades,

3. Apparatus as defined in claim 2 wherein said source of power comprises a portable gasoline engine.

References Cited by the Examiner UNITED STATES PATENTS 1,458,855 6/23 Sargent 259-1 2,035,333 3/36 Mills 259134 2,441,727 5/48 Snow 259l08 X 2,521,384 9/50 Marienthal.

2,753,162 7/56 Conley 259134 2,898,093 8/59 Severson.

3,087,708 4/63 Sims 259-1 CHARLES A. WILLMUTH, Primary Examiner.

Patent Citations
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US1458855 *Mar 31, 1923Jun 12, 1923White Mountain Freezer Co IncIce-cream freezer
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US2441727 *Jun 6, 1945May 18, 1948Snow Ernest MChurn operating mechanism
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US6712499Oct 4, 2001Mar 30, 2004James Clifford Fink, Jr.Compression paddle mixer
US6752561May 28, 2003Jun 22, 2004Xerox CorporationHigh intensity blending tool with optimized risers for increased intensity when blending toners
US6805481 *Aug 31, 2001Oct 19, 2004Xerox CorporationHigh intensity blending tool with optimized risers for increased intensity when blending toners
US7513963 *Nov 1, 2006Apr 7, 2009United States Gypsum CompanyMethod for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US7524386 *Nov 1, 2006Apr 28, 2009United States Gypsum CompanyMethod for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US7754052Nov 1, 2006Jul 13, 2010United States Gypsum CompanyProcess and apparatus for feeding cementitious slurry for fiber-reinforced structural cement panels
US20030063521 *Aug 31, 2001Apr 3, 2003Xerox CorporationHigh intensity blending tool with optimized risers for increased intensity when blending toners
US20030198127 *May 28, 2003Oct 23, 2003Xerox CorporationHigh intensity blending tool with optimized risers for increased intensity when blending toners
US20080099133 *Nov 1, 2006May 1, 2008United States Gypsum CompanyPanel smoothing process and apparatus for forming a smooth continuous surface on fiber-reinforced structural cement panels
US20080101150 *Nov 1, 2006May 1, 2008United States Gypsum CompanyMethod for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US20080101151 *Nov 1, 2006May 1, 2008United States Gypsum CompanyApparatus and method for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US20100132870 *Jan 8, 2010Jun 3, 2010United States Gypsum CompanyPanel smoothing process and apparatus for forming a smooth continuous surface on fiber-reinforced structural cement panels
EP1287879A2 *Aug 30, 2002Mar 5, 2003Xerox CorporationAn improved high intensity blending tool with optimized risers for increased intensity when blending toners
EP2656909A1 *Apr 25, 2012Oct 30, 2013Thöni Industriebetriebe GmbHStirring device for a fermentation device
WO1986006651A1 *May 16, 1986Nov 20, 1986Francois BernardDevice for kneading or mixing pasty products
WO2008057275A2 *Oct 26, 2007May 15, 2008William A FrankApparatus and method for mixing slurry for cement panels
Classifications
U.S. Classification366/325.8, 416/227.00R
International ClassificationB01F7/00, B01F15/00
Cooperative ClassificationB01F7/00175
European ClassificationB01F7/00B12B7