US1867739A - Apparatus for mixing material for making roads - Google Patents

Description

July 19, 1932. w. G. FRAZEE APPARATUS FOR HIKING IATERIAL FOR MAKING ROADS eet s-Sheat 1 Filbd Sept. 25 1929 Jaa' July 19, 1932. w. s. FRAZEE APPARATUS FOR MIXING MATERIAL FOR MAKING ROADS Filod Sept. 25, 1929 13 Sheets-Sheet 2 NAN v maxi y 1932- w. G. FRAZEE 1,867,739

APPARATUS FOR MIXING MATERIAL FOR MAKING ROADS Filed Sept. 25, 1929 13 Sheets-Sheet 3 July 19, 1932. w, G. FRAzgE 1,867,739

APPARA TUS FOR HIXiNGMATERIAL FOR IAKING ROADS Filed Sept. 25, 1929 13 Sheets-Sheet 4' July 19, 1932. w. G. FRAZEE APPARATUS FOR MIXING MATERIAL FOR MAKING ROADS 13 Sheets-Sheet 5 Filed Sept. 25, 1929 July 19, 1932.- we. FRAZEE 1,867,739

APBARATUS FOR MIXING MATERIAL FOR MAKING ROADS Filed Sept. 25 1929 13 Sheets-Sheet e Int/c04 0? July 19, 1932. n w. s. FRAZEE 1,867,739

APPARATUS FOR MIXING MATERIAL FOR KING ROADS Filed Sept. 25, 1929 13 Sheets-Sheet '7 y 19, 1932- w. G. FRAZEE' 1,867,739

APPARATUS FOR MIXING MATERIAL FOR MAKING ROADS Filed Sept. 25. 1929 13-5heets-Sheet s July 19, 1932. w. G. FRAZEE 1 ,867,739

APPARATUS FOR I IXIAIG IATERIAL FOR IAKING ROADS Filed s it. 25, 1929 13 Sheets-Sheet 9 July 19, 1932. w. s. FRAZEE APPARATUS FOR IIXING IATERIAL FOR IAKING ROADS 13'Sheets-Sheet 10 Filed se i. 25 1929 y 1932- w. G. FRAZEE 1,867,739

APPARATUS FOR MIXING MATERIAL FOR MAKING ROADS Filed Sept. 25, 1929 13 Sheets-Sheet 11 y 19, 1932- w. G. FRAZEE 1,867,739

I APPARATUS -FOR MIXING MATERIAL FOR MAKING ROADS Filed Sept. 25, 1929 1:5 Shasta-Sheet 12 Walk 2 5/1665 4 July 19, 1932. w. G. FRAZEE 1,867,739

APPARATUS FOR MIXING MATERIAL FOR MAKING ROADS Filed Sept. 25, 1929 13 Sheets-Sheet 13 Patented July 19, 1932 I PATENT/W 'RE- WALTER GUY FRAZEE, orcn'nau' :mins'iowa, tenants rd iowa immmmm COMPANY, or CEDAR mrzns, rowa, A..coR1=oRa'm;oivor rowA.

ARA S roe M x s u mains w Application filed se tem'b ras, 1529, Serial No. 395,026.

My invention relates to ansapparatus signed to be employed in connection the construction of highways for :forming a.- ravel or crushed stone and an asphaltic binder-tot the usually termed road oil,-wh1ch 1s relatively cementitious mixture of heavy and viscous at ordinary atmospheric temperatures, but thin and tree fiowing'when a heated. In the construction of such grave]; or crushed stone roads surfaced with-1a cemented mixture :of the gravel ia'ndj road 2 oil-- it is common practice to spraythe oil in: heated and fluid condition upon thetop of? the gravel, and then plow the surface toiiiix the oil and gravel, the spraying and'plowing being frequently repeated; and the suriace-* finally rolled to compact This procedure is entirely impossible throughout the w nter season in the cooler climate, and-even in the summer time, ifthe gravel is at all damp good results are impossible;- Furthermore, even under the most favorable atmospheric'and climatic conditions t'he h'eated .oil cools. more; or less irregularly while being applierhso that uniformly-good results cannot be :oh-' tained. The object of my inventlonis the. provision of an efficient apparatus which'v shall be free from the objections incident to the prior practice mentioned, andwhich to.

that end, shall employ means for drying and heating the gravel and mixing it with the proper amount of heated oil at or near the section of the road being surfaced, continuously and in manner and quantity sufficient to be applied in mixed and heated condition: to the roadway, and which can readily be. moved as the work of road making progresses to enable the construction of the road to be carried on conveniently and rapidly, andunder relatively unfavorable climatic conditions.

In carrying out this main purpose and ob-' I have devised and invented the road material mixing apparatus illustrated in the accompanying drawings and hereinafter described in detail and embodying various novel features in the combination and arrangement of parts of the apparatus in cooperative relation to effect the results and accomplish the ends in view; in the provision ofrmeans "for causing a substantially continuous and regulated how of raw .materials through the drying and heating and mixing devices to the mixed material compartmentof the 'apparatusyin the arrangement of the'fraine Work and various portions oftheiapparatu's'in separable parts and units to permiti convenient transportation of the apparatus; antlin various improvements and novel details of construction relating'to certain portions or the apparatus, as the drying drum,agravel and oil feedingmeans, hoisting devices, etc., incidentalitoitliefeatures of construtgtiofibefotementiohdw Inzthe appended claims. the essential ele-' mnt sof my invention are more particularly pointed 301117, it being understood, however, that my invention is susceptible of variation and modification in the construction and arrangement'ofjvarious" parts, and by the sub" stitution ofcquivalentmeans and mechanism for those particularly described; and I: there fore intend' th'at' my'claims shall be construed to include all such modifications and equivalent elements, sofar as they "fall within the true spirit a'nd scope of my invention'and' are not found 'inthe'prior art. 1

' Of the drawings 'which illustrate a road material mixing apparatus embodying my invention in a desirable and preferred form;

Figure 1 1s an elevation of what willbe termed the right-side of the apparatus, set up and connected for use;

Fig; 2is a plan view of the same;

Fig; 3 is an end view of theapparatus looking from what will arbitrarily be termed the rzlad end of the apparatus towards the front 911 l Fig. 4 is avertical section of the heating drum in 'a' plane extending axially of the same;

Figs. 5 and 6 are cross-sections of the same on planes indicated respectively by the dotted lines 5-5 and 66, viewed in the direction indicated by the arrows;

Fig. 7 is a view looking from rear to front of the end of the combustion chamber casing and the discharge chute of the drying drum;

Fig. 8 is a side view of a reciprocatory feeder for regulating the passage of gravel valves for shutting off sections of thecoil at will;

Fig. 10 is a vertical section of a pug m1ll,

showing also certain mechanisms regulating the-supplyof materials to it;

feeder illustrated in.Fig..8; I

Fig. 11 is a'detail of construction ofthe feeder supporting frame; 7 Fig. 12 is a view of one of four similar ratchet mechanisms used for raising and lowering .thetwo compartment bin structures used to ?contain the raw gravel and. mixed materials --Fig. 13 isa transversesection of the elevatoricasing. on the dotted line 13-13 of Fig. l;

.7 Fig; 514 is-an elevation of thesleft side' of the l1'eatin-g;-drum-1and asupportingv truck and other parts of the apparatus carried by.

said truck; 3

Fig; 151s an elevation of the in Fig. 12 viewed atrig'ht angles -to;the posi tion-shownin. such figure; 1 w Fig. 16 is a detail showing in top plan view certain slide members or shoes used for connecting'one of the corner posts and the adjacent=corner of the bin structure;

tending longitudinally of; the machine, of a measuring device for delivering. heated grav-'-.

el tothe pug .mill; 2'.

Like reference characters indicated like parts in all the figures of the drawings.

Before entering upon a detailed description of the construction of the apparatus, its generalorganization may first be briefly explained. The apparatus, or material mixing plant includes a framework of knock-down construction made up of corner columns or posts and bracing and connecting members 7 I material mixed with road oil. Fig. 11 is an end viewof the reciprocating gravel and road oil and the motor for operating the pug-mill together with gravel and oilmcterin or measuring devices and certain registerlng' instruments. associated with the ug-mill and certain connecting parts and members. The .bin structure forms one separable unit which in the completed structure ready for operation is .se-- curedrto the corner-columns, and-the pugmill platform and parts carried by. :itform a'second separable. unit,--also secured to the corner supportsfiand b'oth units -are,soconstructedthatthey may be loaded together on a truck for transportationwhen the apparatus is to' be moved to a different location-- The remaining. portions of the apparatus are in the present instance all carried by a separate single truck by which they may be 4 transported from' one location to another. .-.F ig'.17 is a detail showing in side elevationcertain, adjusting mechanism at the lower. end of theichain of elevator buckets; -ig., 18. is faverticalsection, :in-.-a plane. ex-- These portions include a rotary drying and heating cylinder or-drum arranged to receive, the:-:raw gravel, a-burner for-heating the-drum, an elevator for transferring the dried and heated gravel to the. pug-mill on the framework before mentioned, apump arranged to be connected with a-supply of roadv 1.,Fig 19 isa view, looking towards theleft. side ofthe machine, of the automatic weight-v oil and operatingto force the oil through a heating coil associated with the heatin drum before mentioned'an'd through a meterlngdevice which delivers it to the pug-mill, and a motor and connections for rotating the heating drum and actuating the feedingdevice ing plate 3 and at their lower ends are bolted to said corner posts. The other two corner po'sts 14 at the left side, are similarly connected together by diagonal bars marked 2 and all four of the corner posts, which are formed of I-beam structural iron, are

equipped each at their lower end with a supporting base structure 7 of suitable construction to provide adequate support on the ground.

The upper portions of the posts are connected together by the separable platform unit which includes a pair of beams 6 6 extending from front to rear of the. apparatus and a pair of cross beams 77 resting upon lie adjacent the outer ends of suchbeams in the four outer angles which the beams make with each other at the corners of the frame. The beams 77 are also connected by frame bars 8, 9, 10, 11, l2and 13, to provide a platform frame to which are rigidly secured grating sections marked 14, 15, 16, 17 and 18 which form a walkway. Around the outside of the group of gratings forming the walkway is arranged a railing which may be constructed of supporting members 19 and railing members 20, 20 secured to the platform frame and arranged as illustrated or in any other suitable manner.

For the purpose of affording access to' the pug-mill and other parts of the machine reached by the walkway above mentioned, I

have provided a stairway marked 121 as a whole, extending from the ground to the platform frame and arranged to-land adjacent the grating sections 16 and 18 at the left hand front portion of the framework.

The two-compartment bin unit for holding the raw gravel and the heated treated mixture is a rectangular structure which includes four vertical leg members 22 at its corners which may conveniently be formed of angle iron, and connecting frame members 23 tc which are riveted sheet metal plates 24 forming the upper walls of the bins and a cross partition 25 separating the bins. The four inclined and converging bottom walls 26' of each bin are similarly construetedvgf sheet metal walls riveted to suitable frame members and terminate indischarge Openings at the bottom. I

The two legs members 22 of the bin unit at each side of the machine are connected near their bottom *ends by a cross bar 27, and the legs andframe work preferably are braced by diagonal and vertical bracing members, all

marked 28, directly riveted together, or connected through connecting plates, as the plates marked 29.

At'the four corners of the bin strueure the angle-iron leg members 22 are equipped with pairs of shoes or slides 3O30 adjacent their top and bottom ends which extend over the flanges of the leg columns and serve as guides in raising and lowering the bins when setting .up the apparatus. Each slide 30 extends over the portion of the'flange on one side of the particular I-beam extending from the central web in one direction and the corresponding slide 30 extends over the opposite portion of said flange.

Both the pug-mill platform and the bins,

temporarily bolted together for the purpose, are raised and lowered upon the corner columns by means of a special hoisting mechanism which I have devised for the purpose, the actuating parts of one member of which are shown in detail inFig. 12. This apparatus (see Figs. 12, 15, 18 and 19) includes four cables 31 arranged to run over winding drum 32 severally rotatably mounted in bearings carried by the supporting bases 7 of the four corner posts, and each engaging in turn a sheave 33 rotatablymounted in a bracket 34 at the top of the particular corner post, a sheave 35 carried by the base of the pug-mill platform, and a sheave 33 which is mounted on the same pivot pin as the sheave 33, the ends of the cable being anchored to the corner post adjacent the sheave 35.

As shown in Figs. 12 and 15, each winding drum 32 is associated with aratchet wheel 36 which is fixed to the short shaft, marked 37 to which the drum 32 is itself secured. This sh aft 37 may conveniently be mounted. as shown, in a pair of bracket plates 38 riveted severally to the vertical flanges of a pair of blocks 39 which are L-shaped in cross-sec tion and which are riveted to the opposite 39, and is yieldingly stressed into engagement with the ratchet wheel 36 by a coiled compression spring 43. The pawl 44 of the mechanism is pivoted to a rocking actuating lever 45 which itself is pivotally mounted in the bearing block 42 before mentioned and is formed with an extension 450 below the pivot forming a blocking member. As shown, the pawl 44 is formed with a tail 440 which at times cooperates with the lower end of a spring-pressed trigger 46 slidably mounted in the body member 45 of the actuating lever. This trigger is formed with a right angled bend at its upper end which may be latched in a notch 451 in the upper end of the body member 45 to hold the trigger in inoperative usual manner.- When lowering the bins and platform (assuming the parts to be in the position shown in Fig. 12-), the foot treadle is first depressed and held down to disengage the detent 41, and the handle then lowered under the load of the parts connected to the cable, in the course of which movement the pawl 44 will assume a more nearly horizontal position, and its tail portion 440 will contact with the trigger 46 and shift it, compressing its spring. The foot lever is then released to permit the detent 41 to engage a ratchet tooth, and as soon as the stress on the pawl 44 is relieved the spring-pressed trigger 46 will snap it out of engagement with they tooth of the ratchet wheel, when the operating handle may be lifted to make a new engagement between the pawl and ratchet wheel, and the operation repeated.

It may here be explained that in setting up the apparatus the corner posts or columns are connected separately to the four corners of the bin by means of the slides 3030 before mentioned, while the bin and pug-mill platform (which at the time are temporarily bolted together at each corner) in the lowered position required for transportation, and the platform (carrying with it the bin structure), is then hoisted to a position in which the proper level and the bin legs bolted to the corner posts or then securely columns. To

secure adequate strength and rigidity the corner legs of the bins are in the present instance bolted to the corner post at their top and bottom, and also at an intermediate point. The braces 2 -2 and 2-2 are then bolted. to the corner posts and to the crossbars 27 of the bin frame to further secure rigidity, and the pug-mill frame is then unbolted from the bins and raised further to its proper position and bolted to the corner posts.

Passage of material through the discharge opening at the bottom of the bin (marked A) for containing the cold raw gravel is controlled by a feeding mechanism which may be adjusted to deliver a regulated supply of material to the heating drum later to be described. This mechanism (see Figs.v 1, 8 and 11) is detachable from the bin structure for purposes of transportation, and consists of a detachable framework, marked 50 as a whole, suitably constructed to be bolted to the framework of the bin unit above described, in which is mounted a reciprocating feeding mechanism having a variable throw. The feeder frame-includes a pair of beams 501-502 arranged to be bolted at their right ends to the cross-bar 27 of the bin frame, and at their opposite ends arranged to be similarly bolted to a cross-bar 503 secured to the lower ends of vertical bars 508 secured to the bin frame. To the beam 501 is secured bin structure will stand at-its-l 504 being connected by other frame members 505 running from front -torear and crossmembers 505 to form a skeleton box structure.

Within the skeleton box structure and stationarily supported by pairs of vertical bracket members 51-51 secured to the opposite frame bars 505-505, (see Fig. 8) is a feeder box having a front wall 506, side walls 507, a collar 508 surrounding the neck 509 at the bottom of the hopper, and a top wall 510 to the rear of the collar 508,see Figs. 8 and 11. The rear end of the feeder box is open and immediately below the plane of the lower edges of the side walls and front Wall is arranged. a reciprocating feeder plate 54 formed-with opposite side flanges 540 which extend upwardly along the side walls of the feeder box. Immediately below the plane of the bottom of the collar 508 and also of the neck of the hopper,'is arranged a sliding gate 511 which may be manually operated in any suitable manner, as by means of a handlever 512.

The feeder plate 54 before mentioned is supported by pairs of opposite rollers 55 journaled in. the lower feeder frame members 505, and is reciprocated by a rocking frame consisting of a rock shaft 58 to which is secured a central vertical rock arm 56 equipped with a roller arranged to work between a pair of blocks secured to the under side of the plate 54 centrally thereof, and

including a horizontal arm 57 secured to said shaft at one side of the frame, this arm preferably being telescopic in construction, as shown,for the 'purpose of adjusting its length. The is pivoted in bearings 59 carried by opposite bearing brackets 59 secured to the lower members 505 of the feeder frame.

The discharge opening at the bottomof the bin (marked B) for containing the heated mixed material is arranged to be opened and closed by means of a manually operated gate or slide 60, (see Fig. 3).

The pug-mill which forms a part of my .material-mixing apparatus may be of any suitable design, the general construction employed by me being illustrated in Figs. 2 and 10, from which it will be noted that the mill includes a caslng 61 mounted upon base members 62 and having end' walls in which is rotatably mounted the shaft 63 to which sectional hub sections carrying spaced blades 64 are secured to form a strong and rugged mixing and stirring member. The motor 65 for driving the pug-mill and the clutch 66, both of which are shown diagrammatically, may be of any suitable construction adapted to perform the well understood functions of such devices, numerous commercial forms being well known. A worm-driven reducing shaft '58 of the rocking frame gear device 67 connected to the driven clutch member of the clutch 66 is also shown diagrammatically, and as the purpose and con:- struction of such devices are well known no detailed description is considered necessary. To the end of the shaft carrying the worm Wheel of the reducing gear is fixed a sprock et whee-l connected by a sprocket chain 69 with a sprocket Wheel 70 fixed to the end of the shaft 63 of the pug-mill. A. gravel measuring device for delivering measured charges of heated gravel to the pug-mill, and a metering device for simultaneously delivering measured charges of heated road oil to said mill, both mounted on the pug millplatform, will be described at a later point.

Turning now to a description of the parts permanently mounted upon a truck for transportation, (see Figs. 1, 2, 3 and 14) the frame of the truck is, in the assembled-apparatus when ready for operation, arranged at the right side,-irnmediately to the rear of the raw material bin A. The'longitudinal side beams or sills 71 of the truckframes are connected by angle plates, orother'wise, with; cross beams 72, 72, 72", 73, 74, 75, 76, 77,78and 79 to form a rigid frame which is'supported on the front wheels18080 and rear wheels 8l--81,,the non-rotatable axle of the front wheels being pivoted to rock upon abolster block 82 in order that the wheels may adjust themselves to irregularity in'the surface of the ground. I The drying and heating cylinder or drum 83 is-equipped near its rear end with a hear? ing ring 84,- and at a point between its centerand front end with a similar bearingring 85, through which it is rotatabiy-su'pported upon a pair of front bearing rollers 86, anda pair of rear bearing rollers 87. The front rollers are flanged at their rear side'sand are jour naled in bearings carried by the cross-beams 72 72", and the rear rollers are flanged on the front sides and are carried by the cross beams 7 57 6 (see Figs. 1, 4 and 14) It will be understood that the two rollers" 86 are arranged to engage the ring 85 on opposite sides of the vertical axial plane of the cylinder, and that the rollers 87 are similarly arranged. The flanges of the rollers 86 and 87 serve to prevent longitudinal displacement of the heating drum, but to relieve the rearward strain upon the roller 86 I have provided a thrust bearing arranged vertically beneath the axis of the drum.

As illustrated (see F ig. 4) this thrust bearing comprises a roller 88 rotatably mounted on an approximately vertical axis in a block 89 which is adjustable in a forward and rearward direction on a seat formed by the top faces of the cross-beams 7272 by means of an adjusting bolt 90 engaging a threaded seat in a lug formed on the lower side of the block 89 between the two cross beams.

At its front end the heating cylinder or drum is surrounded by a stationary hood 91, the annular front wall 92 of which makes sealed connection with the cylinder between the outwardly projecting flanges of two. sectional rings 94.94" which are clamped tightl to the drum.- against an interposed asbestos gasket-93 by u'ieinis of clamping lugs at the meeting ends of the sections of the-rin gs. It will be noted that the distance between the sealing rings 94 the front-thrust roller 88 is small, which hasthe advantage of minimizing trouble which ngight arise from =expa-nsion' of the drying drum.

To the top portion of this head is secured the base portion lfle of the smoke stack 106, which is hinged to the baseportion, so that it may be turned to a horizontal position for transportation, as indicated ,by dotted-lines in Fig. 1. At the bottom of the front wall of the hood and opening into adownwa-rdly olfset portion thereof, Ihave provided a hinged door 91 (see Figs. 4.420 11) ,to;enable the dirt and soot which may collect in the hood to be cleaned out. 1

To the rear wall 95 of thehood 91 is se cured a hopper 96 extending under the dis charge end of the feed box and feeder plate 54 of the gravel feeding, mechanism beforede scribed, see Figs. 4 and 8, and at the entrance of the hopper easing into the hood the opening is automatically: variably opened and closed by a swinging gateorvalve 97 which permits the stream of gravel to pass under it while closing the opening thereabove so as to prevent escape of the heated gases from the cylinder and maintain a good draft'inthe flue. The lower end of-the hopper extends into a large central opening in the annular front w-all 98 of the drying and heating drum 83 and delivers the gravel in the path-of a series of intake blades'99, the frontends of which are formed with flanges bolted to the wall 98. Rearwardly of the blades 99, the drum is provided with a series of inwardly extending L-shaped blades or troughs 100 of the same number as theintake blades, and in the present instance arranged in longitudinal alignment with such blades, the trough members 100 having radial portions 101 secured by angle plates 102 to the drum wall, and terminal flange portions 103. The rear end of each intake blade extends spirally to and is secured to the leading face of the radial portion 101 of the trough member which is angularly behind it with reference to-the direction of rotation of the drum, the inclined arrangement of the intake blades acting to force the material rearwardly'of the drum into the spaces between the trough members. These trough inembers,.it may here be noted, terminate a short di'stanceforwardl of the rear end ofthe drying drum. 7 Y

It is obvious that as the raw gravel is worked from the higher front end of the drying drum towards the rear end, the material will be carried up by the troughson the ascending side and fall out as it 'passes' around the top and that the dropping ofj the material through the heated stream of burning gases passing through the drum will effectively and quickly dry and heat every particle of it; The lower rear end of the drying drum'is surroundedby a stationary hoodor casing member 107,-see Figs. 3, ls-and -7,''the joint between the drums and easing being close fitting, or if- .desired, packed, to prevent escape of burning ases. "Immediately beneaththe rear end of the drying drum, a discharge chute 108 is remova-bly secured to the casing 107-, this chute being formed wit-ha. partition 109 separating a by-pa'ss passageway which is normally closed a swinging gate 110 equipped with a'weight 111 for thepurpose, and a lower passage which is variably opened and closed by a swinging gate 112' which yields to theweight of material pressing against it to permit passage of the material therethrough. It'may here'be'explained that for the purpose of ascertaining thete'mpera ture of the material passing-out of the drum the thermometer bulb '113'=of' arr-indicating thermometer 113 is arranged in the by-pass, and when it is desired to make an observation the-weight 111 is lifted to permit material to pass through the upper passage of the chute, and cause the temperature of the matrial to be indicated. Indicating thermometers of the 'type-employed by me,"as thewell known Foxboro indicating thermometers are well known in the art, and need not-be de: scribed in'detail. v

1 Extending through and secured to the rear wall of the hood 107 is arranged a cylindrical casing 114, lined with fire brick 115 enclosing he combustion chamber of the apparatus. The heating means employed for heating-the drying drum may be a commercial oil burner of suitable type, as indicatedgenerally by the reference number 116, having a burner tube 117 extending into thecombustion chamber. For the purpose of transferring the dried and heated gravel delivered from the discharge chute of the drying drum to thepugrmill, I employ a separable elevator including a lower frame section 118 to which hinged an upper frame section 119, the lower section being arranged to be detacbably secured near its lower end to a frame bracket 160 extending laterally fromthe right s ll 71 of the truck frame and supported in inclined position by an inclined bracing frame or strut 120. This bracing frame is pivotally secured at its lower end to another frame bracket 161, also extending laterally from the right sill? 1 of the truck frame before mentioned. When the apparatus is taken down for transportation',"the brackets 160 and 161 serve as-supports for the bracing-frame and elevaton'sections; "The frame section-1=18 of the elevator con- 123 mountedupon pivot pins 124 secured to the bars, see Fig- 13; Each pin 124 is held in place by "set screw collars 162 equipped with set-screws 1631 Between the two collars are interposed apair of tubular spacing blocks 16%164earranged on opp-osite'sldes of a roller 123 rotatably mounted in the pivot pin, and for the purpose" of lubricating the bearing of the roller the-pin is provided with a lubricating passage and: an alemite connection. The frame section'119-is constructs ed similarlyto the section 118. 'The elevator buckets '125-"are' secured to "pairs of links pivoted-to other' links at intervals by means-of pivot-pin's-126 to form a connected ehainor line 'of'buckets which ride over? the 115119125 1235 L: 1:

1 The frame se'etionsfi'are preferably provided, as sh0wn,""-:see Figs- 2, 3 and 13,- with steps 2()O which may be of skeietonconstruc tion,rivetedI to the rightframe bars 0f the elevator. secfiqnsl; v ill it. 1 41:1.

At=the lower nd- -of' the lower frame section,*for'the purpose'of taking up slack in the chain, due towea'r or other causes,- the frame bars (see Fig." 17 )-'are equipped with a pair i of bearing 'blocks' 167 longitudinally adjustable by means-of adj ustingr -screws 168 upon frame sections 127 secured to the bars 118; Between these bearing blocks is mounted an idler sprocket'wheel128 engaged by the pivots of the'el'evatorbucket linei The upper end "of the elevator frame section 119' is detachably secured to the pugmill frame by means of a supporting frame 168 arranged to be bolted at its top and bottom to a pair of bearing brackets 119 secured to-the side bars of said frame section and the pug-mill frame respective1y,-see Figs. 1, 18 and 19. J ournale'din bearings at the top of the two bearing brackets 119 is a shaft 170 to which is "fixed a sprocket wheel 129arranged to engage "the pivot pins connecting the links of'the elevator bucket line." To the left end of this shaft 17 0 is fixed a gear wheel 136 which meshes witha gear wheel 135 fixed to theleft endof a shaft 134 also journaled in'bearings on the two frame brackets 119. The-right'end of this'shaft 134 is arranged to be connected and disconnected by means of a clutch 171 with a sprocket wheel 133 by means of which the gearing'wheels just described and elevator chain are driven (see Figs. 2, 3, and 19-). To this end the right end of the shaft of the pug-mill (which is driven in the'manneralready described) is equipped with a sprocket wheel 131 which-is engaged by a sprocket chain 132 arranged to drive the sprocket'wheel 133 and connected chain of elevatonbuckets. v The movable -member of the clutch 171 is in measuring drum having the present instance arranged to be shifted by means of an operating rod 172 extending from the clutch member to the left to aconvenient osition for its bent end to be grasped y an operator upon the pug-mill platform, through a housing member 173 secured to the elevator frame structure and shielding the gear wheels 135 and 136,-see Fig. 3. The u er loop of the elevator bucket line is covere by a hood 130 extending from the top of the upper cover piece 122 of the elevator to the casing of a measuring device next to be described; For the urpose of observation the hood 130 is preferably provided with a door 130, as illustrated.

It will be noted that the elevator bucket line is completely enclosed and shielded from a point adjacent the delivery chute at the end of the heating drum to the point of delivery of the dried and heated material to the pugmill, whereby any considerable cooling of the material is avoided.

The dried and heated gravel discharged "from the elevator buckets within the hood 'This device includes a casing having at the.

top guide plates-174175 which direct the gravel from the buckets to the center of a semi-cylindrical chamber 176 of the casing in which is arranged to work an oscillating arallel circular sides and three radial bla es, marked 177, 178 and 179. The blade 177 is arranged to oscillate freely within the semi-circular wall of the chamber 176, but the blades 178 and 179 are of such length as to severally bring up, in extreme opposite positions of the drum, against the shoulders which the semi-circular wallof the chamber 176 makes with portions of the top wall of a rectangular discharge chamber therebelow, see Fig. 18. The

shaft 180 on which the drum is mounted is counterweighted outside the casing (see Figs.

:19 and 20) by a weight 181 adiustably seto receive gravel from the elevator buckets,

while in the opposite position the blade 179 will form the floor of a similar compartment between it and the blade 17 7. It is obvious that when the gravel in one compartment accumulates to a given weight it will overcome. the counterbalancing effect of the weight and discharge the material through the discharge passage into the pug-mill, reversing the position of the weight and drum in doing so, andthat the material will then accumulate in the other chamber with a like result, the

heated gravel being-thus discharged into the mill in-regular measured charges. The size of the charges may be regulated by adjustment of the weight 181 on its lever.

The rocking of the measuring drum and counterweight serves also to bring about the discharge of measured charges of heated road oil into the pug-mill through a meter ingdevice. This device (see Figs. 20 and 21) includes a cylinder 183 formed with a central partition 184, and a double piston having heads 185 and 186 which work in said cylinder on opposite'sides of said head, the heads being suitably packed, and the partition being packed around the piston stem 185, as illustrated. In order to vary the distance between the piston heads, and consequently the maximum capacity of the chambers alternately opened on each side of the partition, one piston, as the piston 185, is mounted upon a-sleeve 197 abutting against an adjusting nut 198 arranged to engage the reduced threaded end 199 of the piston stem. This rod is suitably calibrated to indicate the volume of oil discharged at 7 each stroke of the piston, as hereinafter explained. On both sides of the partition, ad-

jacent the partition, the cylinder is formed with ports, marked 187 and 188 which are in free communication, respectively, with branch passages 141*.and 141 between the heated oil inlet pipe 141 and a discharge pipe 191 leading to a spray pipe 143 arranged at the topof the pug mill. Communication between the pipe 141 and either the branch passage 141 or the branch passage 141 is governed by a three-way valve 189, which may be ordinary construction, not illustrated,

and communication between the discharge pipe 191 and either one of the branch pipes 141 or 141 is governed by a similar threeway valve 190 arranged to be shifted simultaneously with the valve 189. The arrangement is such that in one position of the valves the port 187 will be in communication through the valve 189 with the inlet pipe 141 while the branch passage 141* is shut off from the discharge pipe 191 by the valve 190 and at the same time communication between the inlet pipe 141 and branch passage 141 will be'closed by the valve 189 while the port 188 will be in communication through the valve 190 with the discharge pipe 191. In the opposite position of the two valves the communications will be reversed, that is, the oil will be free to enter the opposite cham-' ber of the cylinder through the branch pipe 141 and port 188 and the oil which hacl entered through the port 187 into the other cylinder chamber is free to return and pass through the branch passage 141 to the dis-

Images