US1665405A - Portable asphalt-mixing plant - Google Patents

Description

April 10, 1928. 1,665,405

F. H. CUMMER PORTABLE ASPHALT MIXING PLANT I Filed Feb- 1926 2 Sheets-Sheet l April 10, 1928.

F. H. CUMMER PORTABLE ASPHALT MIXING PLANT Filed eb. 27. 1926 -z Sheets-Sheet 2 Patented Apr. 10, 1928 UNITED STATES FREDERICK H. CUMMER, 0F LOS ANGELEs, CALIFORNIA.

PORTABLE ASPHALT-MIXING PLANT.

Application filed February 27, 1926.

This invention relates to improvements in portable asphalt mixing plants of the type including an elevator structure for conveying the heated sand or aggregate from the heating chamber to an elevated screen box from which it travels downwardlythrough one or more processing devices into the receptacle where it is mixed with the other materials.

The object of the present invention is to provide an improved asphalt mixing plant of this type wherein the elevator structure is so constructed and arranged that it may be swung as a unit and without disturb ing the elevating mechanism thereof to a horizontal position, thereby rendering the plant much more compact and enabling it to readily pass under low bridges and the like when travelling from place to place and to be more easily housed when desired.

A further object of the invention is to provide slide means for the elevated screen box, so that it may be moved to a lower position by a minimum amount of labor when it is desired to make the plant as compact as possible.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

In the drawings, Fig. 1 is a side elevation of a portable asphalt mixing plant embodying the present invention; and Fig. 2 is a fragmentary plan view thereof.

Referring to the drawings, the asphalt mixing plant there illustrated comprises in general a. suitable frame 1 mounted upon front and rear wheels 2 and having arranged upon said frame a substantially horizontal cylinder 3. Sand is supplied to this cylinder through the chute 4 and while travelling through said cylinder is heated by means of any suitable form arranged Within the casing 5.

From this cylinder, the heated sand is delivered through a chute 10 to the elevator which delivers it to an elevated screen box 11. From this box, the sand is discharged. into one or more bins 12 arranged therebelow, and from these bins is discharged into a weighing box 13, which in turn discharges the sand into a receptacle 14 where it is mixed with other materials, as is usual.

The elevator structure, with which this invention largely deals, includes an elongated, enclosing casing 20 normally arranged in a substantially vertical position and extending Serial No. 91,097.

from a point above the screen box 11 to a point below the rear frame wheels 2, so that when said casing occupies its normal, vertical position, the four frame wheels must be mounted upon suitable piers 21, as indicated in Fig. 1. Arranged within the upper and lower end portions of the elevator casing sprocket wheels 22 and 23, respectively, over which travels a suitable chain 24 provided with buckets (not shown) of any preferred type, said buckets being adapted to carry the heated sand from the cylinder 3 to the screen box 11.

The driving mechanism for the bucket chain 24 includes a sprocket wheel mounted upon a shaft 31 journalled in the upper end portion of the elevator casing and upon which shaft the upper sprocket wheel 22 is also mounted. This sprocket wheel 30, which is outside the elevator casing, is driven by a chain 32 which in turn is driven by a sprocket wheel 33 mounted upon a shaft 34 arranged adjacent the mixer casing 14. This shaft 34 is connected by means of a suitable coupling 35 with a shaft 36 in horizontal alignment therewith as clearly indicated in Fig. 2. Shaft 36 is provided with a gear 37 meshing with a gear 38 on a shaft 39, upon which shaft is also mounted a pul- 3 ley 40 driven by a belt 41 from any suitable source of power.

Preferably, the elevator casing shaft 31 is provided with a third sprocket wheel 45 for driving a chain 46 which in turn drives a sprocket wheel 47 on a shaft 48 journalled within the screen box 11 and with which shaft 48 is associated the screening mechanism within said box. Also, shaft 36 adjacent the mixer casing is preferably provided with a second gear 49 for driving the gears 50 and 51 upon the operating shafts 52 and 53 for the mixer teeth 54. A single source of power is therefore utilized in driving the mixer mechanism, the screen box mechanism and the elevator mechanism.

In order to render the plantas a whole more compact and therefore enable it to readily pass under low bridges and the like when moving from place to place and to also facilitate housing the same when desired, the elevator structure is movable as a unit, and without disturbing the bucket chain 24 within the enclosing casing 20, to a substantially horizontal position, as indicated in dotted lines, Fig. 1. For this purpose the elevator casing 20 substantially midway its ends is pivoted at 60 upon a bracket 61 supported upona suitable frame portion. The only things that must be done to enable the elevator structure to be swung, tot-his horizontal position are to remove the sprocket chains 32 and 46, the operating.

platform portion 62, the elevator boot 55 and by means of the coupling 35 diseonnect; and remove the shaft 34 from shaft 36, all

of which may be easily and quickly accomplished.

A slide means 6'5 is also provided forthe screen box llso that it may be moved to a lower posit-ion with aminimum amountaof time and labor when it is desired to still further decrease the clearancereqnired by the plant.v Said slide means. consists of ways suitably mounted upon the support ing members '66: and extending forwardly and downwardly from the top of the front end of the, bin 12, asclearlyindicated in Fig. 1. been removed, the screenbox may besnnply turned around and slid down the ways tosupportingframe therefor, said elevator After the sprocket chain 46' has unit-being pivotally mounted at approximately itsown center offgravity uponsaid main frame, whereby it may be swung about its pivot either to acsubstantially vertical operative position or to a substantially horizontal inoperative posit-ion without disassembling said unit.

2. A portable-mixing plant for road material, comprising a main frame having a platfornr spaced: above ground level, a thorizontally extending drier on said frame above platform level, receiving means mounted: on said :frame above and at the. end of the drier, and an elevator unit for: transferring. material from i the drier to said receiving means, including, elevat-ingmmeans and a frame therefor, and supports located 1 above the platform, said elevator unit being pl otally an'ounted upon said supporjts at approximately its own center of gravity and at approximately the upperplevel of the drier, and thereby substantially balanced tolie at rest either in substantially vertical operae tive position with itsnlower end receiving from'the drier and its upperend delivering, to thebins orin substantially horizontalin operative posit-ion. spaced above theuplatz form at the levelof, the top of the drier-a In testimony whereof-I herebyafiiximy

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