US1723367A - Baffle-plate arrangement for concrete mixers - Google Patents

Description

H. P. PARIS 1,723,367

BAFFLE PLATE ARRANGEMENT FOR CONCRETE MIXEHS Aug. 6, 1929.

2 Sheets-Sheet Filed Nov. 1, 1927 Fig.1.

1521 6276 on flag/"2 ,Pamls,

Aug. 6, 1929. R P I 1,723,367

BAEFLE PLATE ARRANGEMENT FOR CONCRETE MIXERS Filed Nov. 1, 1927 2 Sheets-Sheet 2 Patented Aug. 6, 1929.

UNITED STATES 1,723,367 PATENT OFFICE.

HUG-H P. IARIS, QF KING COUNTY, NEAR KIRKLAND, WASHINGTON, ASSIGNOR TO PARIS TRANSIT MIXER COMPANY, OF SEATTLE, WASHINGTON, A CORPORATION OF. WASHINGTON.

RAFFLE-PLATE ARRANGEMENT FOR CONCRETE MIXERSL Application filed November This invention relates generally to rotatable mixing devices wherein the material to be mixed is contained within a rotatable mixing shell and while contained therein is, by the rotation of the shell and the action of mixing blades thereon, intermixed into a homogeneous mass.

, The invention is more particularly directed to the construction and arrangement and edge formation of mixing blades or baflie plates for acting on the material while contained and agitated in the rotating shell.

The invent-ion has for its principal object to provide a novel form of baffle plate or mixing blade, one edge of which is provided with protuberances or recessed portions affording a greater length to the edge surface of the blade than is present in the length of the blade; to provide a structure wherein the protuberances or recesses do not materially weaken the blade structure, and which increased length of the outer edge of the blade affords a greater slumping or spilling edge surface for the blade than if the edge were a straight Another and important object is to arrange blades of this type or baflie plates within the cylinder or'shell with the protuberancesof the adjacent blades in staggered relation, preferably with the recessed portions of one blade in the path of rotation of the protuberances of the adjacent blade, affording a means whereby the mass of concrete or material to be mixed that passes through the recessed por tion of one blade or plate is acted on by the protuberances of the next blade or plate,causing a quicker mixing of the ingredients at a lower gravity, requiring less power over the straight edge plate now universally in use. 40 With the above mentioned and other objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the ac-- companying drawings and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claim may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings disclosing one embodiment of my invention Fig. 1 is a view in plan of the inner surface of a mixer shell as the same would appear if 1, 1927- Serial No. 230,237.

cut longitudinally and rolled flat, the mixing blades or baffle plates being illustrated as secured to the inner face thereof, in their preferred arrangement.

Fig. 2 is a transverse sectional view through the shell, illustrating the spacing of the baffle plates or blades.

Fig. 3 is afragmentary view in perspective, illustrating three baffle plates or blades in their preferred arrangement on the interior Wall surface of the mixer shell with their cutout or irregular edges in staggered relationship, and also illustrating one form of mountifng for securing the blades to the shell sur ace.

In the drawings, wherein like characters of reference designate corresponding parts in the several views 1 represents a mixing shell of cylindrical formation, provided at one end with an outlet 2, the shell being preferably mounted in a manner not illustrated, to rotate on a longitudinal axis, as, forexample, on the line Mounted on the inner wall surface of the member 1, and illustrated as projecting radially therefrom toward the axis of rotation of the shell, are a plurality of battle plates or mixing blades 3. The blades or plates are arranged preferably in the series C, D and E, circumferentially of the interior of the shell. The blades of the series D are preferably disposed parallel with the axis of rotation of the cylinder, with their ends in relative staggered relation, and the blades parallel spaced. The series C and E are preferably positioned at opposite ends of the cylinder, one at either end of the series of blades D; the blades of these series 0 and E being disposed 'pref- I erably in parallel spaced relation obliquely to the axis of rotation of the cylinder, the angle of disposition of the series E being reverse to that of the series G, and the ends of the blades of the respective series being preferably in staggered relation, as illustrated.

The angular disposition of the blades of the series C and E acts on the material to be mixed in such manner that on the rotation of the cylinder, the. material picked up by the blades of these respective series is discharged therefrom toward the transverse center of the shell or cylinder, to be acted on by the blades of series thus the material in addition to being agitated-by the axial rotation of the cylinder or shell, is discharged from the blades at an an le to the axis of rotation of the cylinder. orresponding blades of the series C, D and E are arranged in end to end relation, afiording between each row an unobstructed passage l5, which admits of the sliding or slipping of the material or its free passage endwise of the cylinder or shell when the same is moved to a dumping position, which preferably is at an incline from the horizontal toward the discharge opening 2. Each blade as clearly illustrated in Fi 3 is preferably of flat plate or sheet construction, formed with a straight inner edge a and an irregular outer edge 5. As illustrated, the irregularity in the outer edge is formed by the projections or protuberances 6, separated by depressions 7, afiording an outer edge 8 of a greater length than that of the inner edge 4, which is the length of the blades 3.

By forming the mixing or outer edge of the blades irregular, l have discovered that as these blades or baffle plates lift the material to be mixed as the cylinder rotates, the material resting thereon-slumps or slides oil this edge surface of greater length than the blade, which in the present illustration is approximately greater than the length of the blade, producing a more thorough mixing in a shorter period of time. 7

By this blade edge construction, I have discovered that during the rotation of the cylinder any dried lumps of aggregate lifted thereby are more thoroughly broken up when passing lmom the edge of the irregular blade than is the casewhen a straight edge blade is used.

Each blade is secured to the inner surface of the shell or mixing drum, with its inner edge l in spaced relation to the shell surface,

and while 1 have illustrated attaching angle brackets 9 secured to the side faces thereof, it is to be understood that these may be in the form of integral extensions.

The spacing of the inner edge of the mixing blades or baffle plates from the inner surface of the shell affords a relatively narrow passage 10 between the inner edge of the blade and the inner shell surface through which small quantities of the mixed aggregates may pass during the mining operation. This spacing also affords a means to assist in the ilow of Water orother fluid around the inanswer her edge surface of the shell when it is de sired to clean or Wash the same.

As illustrated in Fig. 3, the protuberances 6 and depressions 7 of adjacent blades of any given series are preferably arranged in staggered relation.

The arrangement of the bullies or blades with their portions 6 and 7 in staggered relation circumferentially of the axis of rotation of the cylinder, enables successive blades to out upwardly to difierent levels into the mass resting in the cylinder, removing from the mass quantities of material of uneven thickness, the material passing through the recessed portion of one plate being picked up by the protuberances of the plate immediately following. This action takes place during the entire operation of the cylinder, causing a wave formation in the base of the mass of concrete in the shell.

T he formation of the mixer blades or bafilc plates as illustrated and described with an uneven edge, enables the material picked up by the blades to partially slump from its edge almost immediately on the blade clearing the mass. This increases the mixing action and correspondinglyreduces the side load action on the cylinder over the side load action present when straight edge blades are employed.

1 claim in combination With a mixing cylinder, a plurality of mixing blades disposed edgewise in rows circumferentially of the interior thereof With the adjacent ends of corresponding blades of adjacent rows in overlapping relation circumferentially of the cylinder, the outer, edge of each blade provided with re cessed portions afiording protrusions separating the same, the blades of the respective rows lying in parallel spaced relation with the protrusions of one blade lying within the path of travel of the recessed portions of a succeeding blade, and angle brackets extending from the inner edge of each blade for independently attaching the same to the inner surface of the cylinder with the inner blade edge spaced therefrom aifording a passage circumferentially of the entire inner surface of the cylinder unobstructed except for the blade attaching means.

ln testimony whereof I have signed my name to this specification.

HUGH PAR-1S.

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