US1890298A - Portable pump - Google Patents

Description

J. H. MoRRow Dec. 6, 1932.

PORTABLE PUMP 4 Sheets-Sheet 2 Filed Jan. '7, 1932 INVENTOR J ff l0/590W BY ,62u45 ATTORNEY J. H. MORROW PORTABLE PUMP Dec. 6, 1932.

Filed Jan. '7, 1952 4 Sheets-Sheet 5 BYW; me

ATTORNEYS Dec. 6, 1932.

l/llllllll/l//i m J. H. MoRRow 1,890,298

PORTABLE PUMP Filed Jan. '7, 1932 4 Sheets-Shea?,v 4

INVENTOR ff/warm BY VZW@ ATTORNEYS Patented Dec. 6, 1932 UNITED STA-TES PATENT OFFICE JOSEPH H. MORROW, F HOKENDAUQUA, PENNSYLVANIA, ASSIGNOR TO FULLER COMPANY, OF CATASAUQUA, PENNSYLVANIA, A CORPORATION OF DELAWARE PORTABLE PUMP l Application filed January 7, 1932.- Serial No. 585,267.

This invention relates to conveying'apparatus for pulverized or finely divided materials and more particularly to a portable conveyor of large capacity capable of transporting bulk materials through small diameter pipe lines of considerable length 4or elevation or both. Examples of the materials which may be handled include Portland cement, pulverized limestone, lime and soda ash, and

kindred materials capable of becoming fluent when mixed with air in the proper proportions, as referred to more particularly hereinafter.

The invention is particularly directed to modifications and improvements of the apparatus disclosed in my previous Patent No. 1,804,565, issued May 12, 1931, and in lesser degree to the patents referred to therein. The details of operation of these conveyors or pumps as well as the various parts of the conveying system are fully described in the patents referred to.

In brief, the operation of these pumps is as follows The material descends or is other- '25 wise introduced to a cylindrical barrel surrounding an impeller screw. This screw is usually of differential pitch, the pitch of the flights decreasing toward the termin-al or discharge end in order to compact the material as it is advanced to a point of air injection.

The density of material is sometimes further increased by a dead space or seal between the terminal flight of the screw and the point of air injection, as described more fully in the patents above mentioned. The primary function of the compressed air is to render the materials -fluent so that they may be forced through pipe lines by the impulse or displacement of the screw and the normal expansion vof the compressed air, the actual'work of conveying being particularly a function of material displacement by the screw.

It should be borne in mind that the sealing effect of the screw flights and the seal space is an important feature of a pump or pulverizing materials, particularly! because it prevents the escape of air toward the source of material supply. Such an escape of air r tends to aerate or fluidize the material lying "a With-in the flights of the .screw and thus the screw efficiency decreases to a point where the material will not advance and in additionespecially in the portable co-nveyor, a dust nuisance may be created. .As will also be understood, the density of material as it reaches the point of air injection must be such that its resistance to the flow of air will be slightly greater than the resistance of the transport pipe line, valves and bends.

In my patent above referred to, I have dise0 closed a portable pump arranged to unload box carsand barges and to convey the materials through a section of flexible hose, which may terminate in a steel pipe line leading to the point or points of delivery. The present invention is' concerned with a portable conveying apparatus of greater capacity and capable of conveying for substantially greater distances, the new apparatus being part-icularly adapted to fill the requirements of conveying cement.

Modern concrete central mixing plants, as well as concrete mixing pla-nts on construction projects involving the use of concrete,

consume very large volumes ofPortland ce- 5 ment. For this work, the cost of shipping cement in bags 'is prohibitive. These excessive costs include the bags themselves,l bagging and handling at the mill, as well as at the point of consumption, the loss of cement, cleaning and return of bags, and the delays in mixing.

Unloading with mechanical conveyors has generally proven unsatisfactory, owing to the difficulty in adapting them to local conditions as the construction work progresses, the danger of breakdowns and the difficulty of obtaining labor to discharge cars, especially in hot weather. x

The present system may easily be operated by one man with little physical effort, and as the cement is conveyed through small diameter pipe lines, the apparatus can be set up quickly regardless of local conditions such as the features of the terrain.

When shipments of bulk cement are made in standard box cars, for instance, settling takes place during transit by the vibration of the ear, so that the cement is compacted and difficult to convey at large capacities.

The new apparatus is arranged with a positive device for feeding the screw, the feeding device having two functions; namely, .to break down the compacted piles of cement and deliver it to the screw, and also to maintain the screw at its fullest possible capacity in order to form a seal with a screw and barrel of minimum length. The apparatus is accordingly of compact dimensions and may easily be operated in the limited .space available in cars, barges and canal boats. The feeding device is so designed that very little residue of cement will remain on the floor to be recovered by hoeing or sweeping. For small machines of the new construction, for example of the size illustrated .in my patent above referred to, the feeding device may be driven by a small motor, operating through a worm wheel, the motor being secured to the gear housing. This offers the simplest arrangement where the capacity desired is greater than that obtainable with the arrangement shown in the patent referred to, P

and where the size and weight of the apparatus is such that the operator can move it by his own effort. In the larger types of pumps, however, I prefer to drive the feeding device from the pump motor, for reasons which will appear l:obvious from the detailed specifications.

The supporting wheels of the pump may be independently driven by power supplied from the pump motor, the drive mechanism being .such that the wheels may be driven in either direction to enable the operator to force the feeding device into the compacted cement, and to turn the apparatus so that the feeder will. swing through any desired arc. The new apparatus comprises in general a pump arrangement generally ofthe type re erred t'o in my patent above mentioned, but as it is of considerably greater weight, it cannot be operated manually. It also differs in that the pumpbarrel and impeller screw are relatively shorter, as the positive feeding de-- vice referred to hereinafter maintains a greater density of material at the inlet of the barrel.

At the inlet endyof the' barrel a. hood is provided, which flares outwardly and covers preferably at least one complete' Hight section of the screw. The opening of the hood s ans one-half of a rotating, perforated dise, w ich serves as a feeder for the screw by carrying the material to be conveyed into the hood, where it will .bepicked up bythe forward Hight of the screw, as the latter turns toward the periphery of the disc. As the screw is l inclined with relation to the disc', thelatteru also tends to force material into the flights from below. The screw-is accordingly initially filled to its full capacity,and the material is compacted to the properv density in a pump barrel and screw sect-ionl of relatively short length.

The actionvof the perforated disc, in addition to the above, is to break downdensely packed cement and to cause it to flow freely,

the perforations assisting in this function as.

with the ioor is maintained by thefrounded end of the supporting shaft. I .have dis'- covered that the disc is most efficient at an operating speed of approximately 30 R. P. M., and as the impeller screw is preferably driven at speeds of from 900 to 1200 R. P. M., speed reduction gearing of the proper ratio is provided.

rl'he wheels supporting the pump are arranged on independent stub shafts, theJwheel on the feeder side of the'pump being slightly advanced. This prevents a tendency for the ump to swing in the direction opposite to rotation of the disc, due to the eccentric relation of the latter with respect to the centerline of the pump. The wheels are located slight-ly in rear of the center of balance to cause the pump to tilt forwardly and mainy.tain the disc 'supporting shaft in contact with The feed disc and wheels are the floor. driven by the following arrangement: Speed reduction gearing starting with a spur gear on the pump sha'ftdrives the feed disc continuously. Forward and reverse clutches vare provided for each wheel and each pair of' clutches is operated by a common hand lever. The clutches control the direction of rotation of sprocket shafts and one or more flexible chains transmit power tc a sprocket or sprockets secured to the wheel.

With the operating levers in neutral position, the pump remains stationary. If both levers are pushed forwardly. the pump will advance and the feed disc will be forced -into the pile. causing the latter to break down. usually burying most of the forward part of the pump. Pulling the levers backwardly reverses the wheels and the pump may be swung through any arc by using one lever only, or by moving the leversoppositely to cause the pump to turn on a fixed pivot.

In the accompanying drawings, which illustrate a preferred embodiment of the in-v vention:

Fig. 1 is a side elevation partly in section;

Fig. 2 is a plan view; I

Fig. 3 is a rear elevation, with the cover removed from the power take-off gearing and the supporting wheels and driving sprockets shown in cross-section; 4,

Fig. 4 is a detail in front elevation of the feeder assembly, showing its relation to the impeller screw;

Fig. 5 is a detail, partly in section, of the feeder speed reducer;

capacity in all positions.

Fig. 6 is a sectional elevation-of the feed disc, speed reducer and drive assembly;

Fig. 7 isa cross-section of the supporting wheel clutch mechanism on line 7-7 of Fig. 8;

Fig. 8 is a. rear elevation, one-half in crosssection, of the supporting wheel clutchmechanism;

Fig. 9 is a modified form of the feed disc drive assembly with independent driving motor, the detail being shown in front elevation, partly7 in section; and

Fig. 10 is a side elevation of the feed disc drive assembly shown in Fig. 9.

Referring to the drawings, and first to Fig. 1, the apparatus is seen to consist, of a pump casing or barrel 1, provided with a flange 2 at its inlet to engage a complementary flange 3 of the hood 4, which is flared outwardly and spans one side of a feed disc 5, as indicated particularly in Fig. 4. The feed disc 5 is substantially parallel with the floor 6, upon which the material to be conveyed is stored, but is tilted forward slightly to avoid excessive friction. The hood 4, having an open bottom spanning one-half of the disc 5, is provided with aflange 7 to which aflange 8 of the feeder assembly indicated at 9 is secured at the left-hand side of the machine for reasons which will appear hereinafter. The direction of rotation of the feed disc 5 is indicated by the arrow in Figs. 2 and 4.

An impeller screw 10, provided with flights 11, is arranged concentrically with the casing in the usual manner with preferably at least one complete flight section 12 within the hood 4, the leading edge of the flight being thus arranged to receive the maximum load carried by the feed disc 5. As the casing or barrel 1 and the impeller screw 10 are inclined with relation to the feed disc. material not engaged by the leading edge of the screw flight is forced into the space in the hood 4 between the flights of the first section. and the flights are thus forced to receive their maximum The pitch of the screw decreases toward the terminal flight 13, and a dead space or seal is provided between this flight and the point of air admission. indicated generally inthe air ring 14, thev casing 1 being suitably flanged and secured to the ring 14.

Compressed air for rendering the material fluent may be injected through the air ring from a suitable source of supply represented by the valve 15, the pipe line 16 and the branches 17. i

Secured beyond the air ring 14 is an offset The end-bell 25 and the bearing assembly do not dier substantially from the arrangement disclosed in my patent above referred to and includes, in brief, a cylindrical recess 26 for a bearing 27, carried on a bushing 28 surrounding the screw shaft 10. The section of the bushing indicated at 29 is of increased dioff to be described in detail hereinafter.

Relative movement of the bushing 28 and the screw shaft 10 is prevented by means of the lock collar and key 37 and the nut 38.

Should the screw become worn or damaged, it may be removed for repair by loosen,- ing nut 38, andthe lock collar and key 37, and can be completely removed from the bushing 28 and barrel 1 by removing the feedler assembly 9. This operation does not dis turb the assembly of the bearings, motor or power take-off, as these remain engaged with the bushing 28.

The power take-off is arranged within a recess 40 formed in the rear surface of the endbel] 34 and comprises the spur gear 36, which meshes with a spur gear 41 supported in suitable bearings on a stub shaft 42. The gear 41 meshes with the spur gear 43, which is secured to a shaft 44 and supported in bearings 45 in the upper portion of the end-bell 34. The power take-off is enclosed by thev cover 46, to which is also secured a cap 47 which encloses the shaft lock collar 37 and nut 38, cap 47 being provided to permit removal of the screw shaft 10 in the manner described.

T he shaft 44 terminates in one-half of the flexible coupling 47, the other half of which is secured to the countershaft 48 (Fig. 7 The shaft 48 'passes through a channel 49 formed in Athe bottom section 50 of a clutch housing 51. The ends of the channel 49 are closed by stuffing boxes 52 and 53, to retain lubricant and the shaft is supported for rotation in anti-friction bearings 54 andf55. The lower portion of the channel forms an oil sump which may be drained by means of a suitable pipe connection 56. Secured to the shaft 48 is the worm gear 57, which drives a worm wheel 58, forming a part of the'supporting wheel driving mechanism.

The worm wheel 58 is mounted in an a-ntifriction bearing 59 in order that the wheel may turn freely on shaft 60. The shafts 60 and 61 are otherwise similar and arranged for rotation in bronze bushings 62, secured in sleeves 63, formed as extensions to the upper and lower sections of the clutch box 51,

.l versing clutch drum 68.

being flanged as at 64 to secure the two sections.

The shafts and 61 are driven in both directions by similar and oppositely arranged mechanisms, only one of which is shown and described specifically for sake of simplicity. Secured to the worm wheel 58-and at three equidistant points, are planetary triple gears 65. The gears 65 are mounted for rotation on stub shafts 66, each shaft being arranged tocarry a gear on each end, one on each side of the worm wheel.

Within the clutch housing 51 and surrounding shaft 61 isthe bushing 67 of a re- The inner end of the bushing is provided with sun gear teeth 69 to'mesh with the central teeth of the plan-y etary gears 65. These gears are also provided with an inner row of teeth 70, which mesh with a driven gear 71 fixed to the shaft 61. i

. If the drum 68 is held stationary by the clutch mechanism described hereinafter, it will be evident'that owing tothe greater radius of the central teeth of gear 65 with reference to the sun gear 69 fixed to the drum 68, the shaft 61 will be driven in a clockwise direction, by reference to the right of Fig. 8,

or in the direction of Fig. 7.

The forward drum 75 is provided with a sun gear 76 which meshes with an outer row of teeth, as indicated at 81, inorder that two drive .l chains may be provided. Double chalns arepreferred in order to obtain greater flexibility on short radii than would be l afforded bya single strand of the necessary strength.

Referring particularly to Figs. 2 and 3, it Will be noted that the chains indicated at 82 pass over sprockets 83, mounted for rotation on stub shafts 84 and keyed or otherwise secured to the hubs 85 of the supporting wheels 86 and 87-. It will be noted from Fig. 2 that wheel 86 and its stub shaft 84 are arranged a slight distance forwardly with respect to wheel 87 in order to prevent a tendency of the machine to turn or swing contra to the directfon of rotation of the disc 5.

Each drum 68 and 75 is provided with a clutch band 90, only one of which is described in detail, as they are identical. Referring to Fig. 7, it will be seen that the clutch band 90 is the lugs 92 and 93 apertured to surround provided with the usual liner 91 andv the bolt 94, which is provided with a fixed collar 95, bearing against'lug 92. A spring 96 tends to expand theband 90 and maintain it out of contact with the drum, in' this case drum 75. Lug 93 abuts the screw plug 97, provided with a bore 98 to receive the bolt 94. The plug 97 is provided with screw threads and passes through a wall of the clutch box 51. An arm 99 is provided at the end of the latter so that it may be adjusted in position, to take up or release the band 90, depending on the condition of the lining 91. Bolt 94 extends through the opposite wall of the clutch box, through a bushing 100, and its end is rounded to engage a surface of a cam 101, pivoted at 102 vin a fork 103, secured to a wall of the clutch box 109, arranged to turn on the supporting shaft 110. The sleeve 109 is provided with an operating lever 111. It will be evident that when this lever is moved forwardly, the link mechanism above-described will cause the cam surface 101 to force the bolt 94 inwardly to engage the clutch, thereby driving wheel 86 to move the machine forwardly. The sleeve 109` is also provided with a similar link mechanfsm 112, pivoted at 113 to arml 114 to a similar but inverted cam, which engages the reverse mechanism to engage the drum 68, thus moving the operating lever 111 backwardly tightening band 90 on the reversing drum 68, causing wheel 86 to move backwardly. Wheel 87 is driven independently in the same manner under the control of hand-lever 115.

It will be appar-ent that by moving both levers forwardly, the machine will advance, and by pulling them backwardly, it will move backwardly, and that by moving the levers in opposite directions the pump will swing on substantially a fixed pivot. The supporting shaft for the operating levers and their sleeves may. be of pipeor other relatively light but rigid material, and is secured in position by' braces 116 and 117 to projections 118 and 119, Ccast as an integral part ofthe rear motor end-bell 34. Additional braces 120 and 120cm, attached to the upper surface of the clutch box 51 hold the shaft 110 in a fixed position.

The-feed disc driving means is as follows: By reference to Fig. 7 it will be seen that the countershaft 48 extends through the stuffing box 52, the gland 121 of which forms a socket to receive a protecting tube 12171, which encloses a power transmitting shaft 122. This shaft is connected to shaft 48 through a suitable universal joint indicated at 123.`4 A second universal joint 124 connects shaft 122!` with worm shaft 125, shown more particularly in Figs. 5 and The worin shaft 125 drives a worm wheel 126, secured to the upper end of shaft 127. The worm shaft 125 is rigidly supported in a combined radial and thrust bearing 128 and beyond the Worm in a radial bearing 129, both of which are arranged Within the speed reducer housing 130. The upper end of shaft 127 is shouldered at 131 and bears against the inner race of bearing 132, designed to take the radial load, but more particularly to carry the upward thrust of the shaft.

The lower end of the shaft turns in a bronze bushing 133. Spaced slightly below the bushing and secured to the shaft is a flanged sleeve 134, to which the feed disc is secured preferably by rivets.

The feed disc is preferably provided with a multiplicity of circular openings 135, countersunlr on the upper surface to assist 1n moving the material. I have found that this arrangement moves the cement or other material at the greatest capacity and the openings have the advantage ofpreventing the disc from climbing or rising, maintaining the lower end of the shaft 127 in contact with the Hoor. This is particularly important when cement has been shipped a considerable distance by rail, as the vibration of the car causes the cement to pack in a solid mass of suflicient density to support the apparatus and the disc out of contact with the floor, in the absence of openings.

The arrangement further has the advantage of breaking down the cement so that the latter is free-flowing. The material below the disc flows through the openings and is carried rapidly to the hood 4, leaving very little residue on the floor.

In order to prevent contact between'the edge of the disc and the walls of the car, at least two arms 136 are secured to flanges on the feeder assembly' 9, or other convenient place, and these extend a short distance beyond the edge of the disc.

As noted above, the disc 5 is most eicient at operating speeds approximating 30 R. P. M. Theimpeller screw is most eificient at speeds between 900 and 1200 R. P. M. Accordingly, simple squirrel cage motors may be employed, with speed reduction gearing, as described above, designed to drive the feed ,disc at the proper speed regardless ofthe speed of the motor. The rotor and stator of the driving motor may accordingly be standard parts of 60 cycle, squirrel cage induction motors, but the end-bells 25 and 34 are specially desigred and for the sake of lightness aluminum castings are preferred.

A modified form of feed disc driving mechanism is shown in Figs. 9 and 10. This arrangement is intended to serve as an eilicient feeder .for small portable pumps, light enough in weight to permit manual operation. More particularly it is intended to increase the capacity and utility of portable pumps of the type disclosed in my patent above referred to, in which case the arrangement is substituted for the scoop 17, shown therein.

The. apparatus comprises a small, independent motorl 140, the forward end-bell 141 of which is extended and forms a part of the speed reducer housing 142, toform a dusttight connection,as the forward end of the apparatus is frequently buried under av slide` of cement. The motor shaft 143 is extended and supported in a bearing arrangement identical to that shown in Fig. 5, and accordingly not shown in further detail. Fixed to the motor shaft is a. worm'144, which meshes with a worm wheel 145, secured to the disc supporting shaft 146. The remainder of the structure is similar to that disclosed in Fig. 6, and accordingly is not described` in further detail.

The operation of the apparatus, and referring particularly to the completeform, is as follows: Assuming that the pump is to be used for unloading bulk cement from an ordinary box car7 a small platform to support the pump when cars are moved is usually erected adjacent to the railroad siding and at the level of the car floor. Approximately 30 feet of rubber or other flexible hose is i connected to the flange 22 of the conduit 21,'

and its other end to the usual steel pipe line leading to the storage and concrete mixer supply bins. Compressed air from a suitable source of supply is brought tothe pump through a flexible hose connected to the valve 15, and power is supplied from the motor starter to stop and start push-buttons indicated generally at a convenient position at 15() on the brace 117. When the car is in position and the bulkheads are removed from the doors. the operator starts the driving motor and moves the pump into the car steering it by means of the control levers 111 and,

115. When the disc 5 comes into contact with the cement, compressed air is admitted under the control of valve 1'5 to the proper` operating pressure, which is usually indicated by a suitable gauge, such as shown at 151, connected to the air pipe line 16. The most efficient operation consists in suppleinenting forward motion of the pump with pivotal movement to cause the disc 5 to swing across the car, so that large masses fall and bury the feed disc and the associated forward elements of the pump.

When the disc is buried under a sufficient load, the operator may leave the control levers, which return to the neutral position by the action of spring 96, which.separates the clutch bands from the drums, leaving the machine stationary, so that the operator may leave the pump for short intervals to sweep up the residue of cement lying on the floor. By this method of operation the pump is forced to its maximum capacity.

Cil

It will be evident that many modifications maybe made inthe apparatus shown. For instance, although I have shown and described a cycle squirrel cage induction motor as the prime mover, because 60 cycle current is usually available, other types of motors may be employed in an obvious manner.

I claim: i

1. Apparatus for conveying pulverized material, comprising a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing and extending through a wall of the latter, a feeder secured to the casing near the open end thereof comprising a substantially horizontal perforated disc arranged on a substantially vertical driving shaft, means for rotating the screw at high speed, and means for (driving the feeder at a relatively slow s ee P2. Apparatus for conveying pulverized material` comprising a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing and extending through a wall thereof, the open end of the casing -terminating in an outwardly flared hood and a feeder forv the screw secured near the open end of the casing at oneA side thereof, and comprising a substantially horizontal disc secured to a substantially vertical driving shaft, the feederw being arranged at one side of the casing with the hood spanning one side of the disc, and means for driving the screw at'relatively high speed and the feeder at relatively slow speed.

3. Apparatus for conveying pulverized material, comprising an inclined casing having an open end for the admission of material and an offset discharge elbow connected to the other end, a screw shaft within the casing andextending through a wall thereof, the casing terminating in an outwardly flared .hood spanning a horizontal feed disc arranged at one side thereof on a substantially vertical driving shaft, and means for driving the screw at relatively high speed and the feeder at relatively slow speed.

4. Apparatus for conveying pulverized material, comprising an inclined casing having an open end for the admission of material and an oH'set discharge elbow connected to the other end of the casing, and a screw shaft within the casing and extending throughl a wall thereof, the casing terminating in an outwardly flared hood spanning a horizontal feed disc arranged at one side thereof on a substantially vertical driving shaft, the screw being arranged to notate at relatively high speed withthe flights turning toward theperiphery of the disc and the disc arranged to be driven toward the screw to deliver material to the flights.

5. Apparatus for conveying pulverized material stored in bulk on a floor, comprising .a substantially horizontal feed disc provided with a multiplicity of perforations, the disc being secured at its center to a substantially vertical driving shaft, the center of the disc beingsupported a short distance above the floor to avoid friction with the latter, and speed reductionmeans arranged at the upper end of the shaft and means for driving said speed reduction means.

. 6. Apparatus for conveying pulverized material stored in bulk on a floor, comprlsing the combination of a `substantially vertical drive shaft, a substantially horizontal feed disc provided with a multiplicity of perforations, countersunk at the upper surface of the disc, the disc being secured at its center to said shaft, the center of the disc being supported a short distance above the fioor to avoid friction with the latter, and speed reduction means arranged at the upper end of the shaft and means for driving said speed reduction means.

7. Apparatus for conveying pulverized material through ak pipe line, comprising the combination of a casing having lan open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing and extending through a wall of the elbow and mounted in'spaced bearings therebeyond, means for driving the shaft, the open end of the casing terminating in an outwardly flared hood7 and a feeder arranged at one side thereof, comprising a substantially horizontal disc,

one side of which is spanned by said hood,

the disc being secured to a substantially vertical driving shaft, the latter being driven from the' screw shaft through speed reduction gearing including a gear on the screw shaft.

8. Apparatus for conveying pulverized material through a pipe line, comprising the combination of a casing having an open end ytal disc, one side of whichis spanned by said hood, the disc being secured to a substantially vertical driving shaft, the latter being provided with speed reduction gearing at its upper end and means for driving the laty ter comprisingV power takeo gearing and shafting including a gear secured to the screwV shaft.

9. Apparatus for conveying pulverized material through a pipe line, comprising the combination of a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing extending through the wall of the elbow and mounted in spaced bearings beyond the clbow, the rotor of a motor attached to the shaft between the bearings, a stator frame surrounding the rotor, the said stator frame being rigidly attached to the casing, the

open end of the casing terminating in an outwardly flared hood spanning one side of a feed disc, the disc being secured at its center to a vertical driving shaft arranged at one side of the hood, and means for driving the shaft comprising speed reduction and power takeoff gearing, including a gear secured to the extension of the screw shaft.

l0. Apparatus for conveying pulverized material, comprising the combination of a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing extending through a wall of the elbow, a bushing surrounding and fixed to the extension of said shaft, the bushing being mounted in spaced bearings, a rotor of a motor attached to the bushing between the bearings, a stator frame surrounding the rotor and rigidly attached to the casing, the open end of the casing terminating in a outwardly flared hood for the admission of material, the hood spanning one side of a substantially horizontal feed disc, the latter being secured at its ,center to the lower end of a driving shaft arranged at one side of the hood, and means for driving said shaft comprising speed reduction gearing driven by a gear on the bushing surrounding the extension of the screw shaft.

ll. Aapparatus for conveying pulverized material which comprises the combination of a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing extending through a wall of the elbow, the open end of the casing terminating in a hood spanning one side of a feed disc, -.means for driving the disc to deliver material to the hood, the screw shaft having flights arranged so th at substantially one flight section is covered by the hood.

l2. Apparatus for conveying pulverized material, comprising the combination of a casing having one end open for the admis,- sion of material and an opening at the other end for the discharge thereof, and an offset discharge elbow at the other end of the casing, the open end of the casing terminating in an outwardly flared hood spanning one side of a substantially horizontal disc, the disc being secured at itscent'er to a vertical driving shaft, the screw shaft lying within the casing and extending through a wall of the discharge elbow, approximately one flight of the screw being covered by the hood to engage material delivered by the disc.

13. Portable apparatus forl conveying pulverized material through a. pipe line, com# prising the combination of a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing and extending through a wall of the elbow and .mounted in spaced bearings therebeyond, the open end of the casing being provided with a feeder for delivering material to the casing, a rotor of a motor connected to the shaft between the bearings, a .stator frame surrounding the rot-or, a pair of wheels mounted on axles secured to the stator frame slightly to the rear of the center .of weight of the apparatus, power takeoff gearing driven by a gear on said shaft for driving the feeder and also the supporting wheels, the wheels being driven independently in either direction through manually operated forward and reverse clutches for each wheel.

14. Portable apparatus for conveying pulverized material through a pipe line, comprising the combination of a casing having an open end for the admission of material, an offset discharge elbow connected to the other end of the casing, a screw shaft within the casing and extending through a wall of the elbow and mounted in spaced bearings therebeyond, a rotor of a motor secured to the shaft between the bearings, a stator frame vsurrounding the rotor and a pair of wheels mounted on axles secured to the stator frame slightly tothe rear of the center of weight of the apparatus, a feed disc arranged at one side of the casing secured. at its center near the lower end of a substantially vertical driving shaft, the lower end of said driving shaft serving as a support for the forward part of the apparatus, means for driving the feed disc and the supporting wheels from lthe screw shaft, comprising power takeoff gearing including a gear secured to the shaft, shafting extending from said gearing to speed reduction gearing secured to the shaft of the disc, said shafting also driving additional speed reduction gearing for driving counter-shafts through independent manually controlled forward and reverse clutches for each wheel, said counter-shafts being provided with sprockets and chains connecting said sprockets with supporting wheels.

15. Portable apparatus for conveying pulverized material, comprising the combination of an inclined casin g having an open end for the admission of material, a substantially horizontal feed disc arranged at the open end of the casing on one side thereof and secured lnear the lower end of a substantially vertical driving shaft, the said shaft serving as a support for the open end of the casing, the

sprockets secured to said lla other end of the casing terminating in yan olii'- set discharge elbow, a screw shaft lying within the casing and extending through and mounted in spaced bearings beyond a wall of the elbow, a rotor of a motor secured to the shaft between the bearings, a stator frame surrounding the rotor and secured to the casing, supporting wheels mounted on axles attached to the stator frame, and means for driving the feed disc and the supporting wheels, comprising power takeoff gearing driven by a gear secured to the screw shaft, said gearing driving shafting terminating in a speed reduction gearing attached to the upper end of the feed disc shaft and also for-v ward and reverse clutches for each wheel, means for transmitting power from the clutches to each wheel and manually controlled means for operating each clutch independently.

In testimony whereof I affix my signature.

JOSEPH H. MORROW.

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