US2640592A - Portable gravel screen - Google Patents

Description

June 2, 1953 v p, FINGER 2,640,592

' PbRTABLE GRAVEL SCREEN I Filed June 30, 1949 2 Sheets-Sheet 1 I INVENTOR t:- PHILIP M. FINGER FIG. 5.. BY

ATTORNEY June 2, 1953 F. M. FINGER PORTABLE GRAVEL SCREEN Filed June 30, 1949 .2 Sheets-Sheet 2 FIG. ll.

INVENTOR PHILIP M. FINGER ATTORNEY Patented June 2, 1953 UNITED STATES PATENT OFFICE PORTABLE GRAVEL SCREEN Philip M. Finger, St. Louis, Mo. Application June 3'0, 1949, Serial No. 102,373

1 Claim. 1

This invention relates in general to certain new and useful improvements in portable, gravel cleansing machines adapted for use by roofers on high roofs and similar locations which are normally difficult of access.

At the present time most large commercial and industrial buildings such as cflice buildings, hotels, apartment houses, loft buildings and the like have fiat, gravel'ed roofs which must be repaired or resurfaced from time to time. In performing such operations, roofers usually brush and scrape all the old gravel off the roofing surface and laboriously lower the used gravel to the street level tobe discarded, then, after the tar, pitch, or other roof coating composition has been applied, new gravel is hauled up to'the roof with equal labor and efiort and spread over the surface to complete the job. Obviously, the old gravel is just as good as the new gravel except that it is dirty and contaminated but heretofore it has been impossible to clean and screen it to remove fines, foreign particles, and dust.

It is, hence, the primary object of the present invention to provide a portable machine which is particularly adapted for cleaning roofer-s gravel and removing therefrom all dust and other deleterious material so that the gravel may be reused in situ.

It is another object of the present invention to provide a portable gravel cleansing machine comprising sections which may be easily disassembled and assembled for facile transportation and handling.

It is a further object of the present invention to provide a gravel cleansing machine having angularly disposed screen members for facilitating the displacement of collected material therefrom.

It is an additional object of the present invention to provide a gravel cleansing machine which is simple in construction and reliable in operation.

With the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claim.

In the accompanying drawings (two sheets)- Figure l is a side elevational view of a screening machine constructed in accordance with and embodying the present invention;

Figure 2 is an end elevational view of the gravel cleansing machine;

Figures 3 and 4 are transverse sectional views taken along lines 3-4 and 4 4, respectively, of Figure '1;

Figure 5 is a transverse sectional view taken along line 5--'5. of Figure 4;

Figure 6 is an enlarged fragmentary view showing the connection between the channel members and the supporting angle members of the conveyor forming a part of the present invention;

Figure 7 is a fragmentary sectional view taken along line 'II of Figure 6;

Figure 8- is a fragmentary side elevational view of a verticalleg section and the means of connecting the component elements thereof;

Figure 9 is a fragmentarytransver'se sectional view takenalon line 9--9 of Figure 8;

Figure 10 is a fragmentary sectional view taken along line Ic -I0 of Figure 1;

Figure II is a fragmentary sectional view taken along line II- II of Figure 10; and

Figure 12 is an exploded view of the screening machine showing the relation between the several component elements thereof.

In broadest outline the invention resides in a sel'fcontained, conveyerized, gravel cleansing machine comprisingsections which may be easily disassembled and assembled, and having screen members disposed at an angle to the horizontal in order to permit easy displacement of collected material therefrom.

Referring now in more detail and by reference characters to the drawings which. illustrate a preferredembodiment of the present invention, A designates a gravel cleansing machine having a main frame section B which. comprises spacedparallel angle iron members I, I. Extending transversely between said members I, I. and secured at their ends thereto, as by welding, are a. plurality Of spaced, parallel cross bars 2. Welded to each member I, I, are the lower ends of a series of, preferably four, support legs 5-, B, I, 8. The leg 5 of each series is disposed. at the forward end-of the members I, I, and inclines rearwardly and inwardly, being connected, adjacent its upper end, by bars 9 to the legs 6 which are spaced rearwardly therefrom and incline inwardly. The legs 1, having their lower ends adjacent' that of the legs 8, incline inwardly and rearwardly and are connected to the legs 6 by bars It, said legs 7 being further braced by struts II which are secured. at their lower ends to the members I, I. The legs 8 are disposed at the rearward end of the members I, I and incline forwardly and inwardly, being braced by struts I2- welded at their lower ends to the mem-" bers l, I. Suitably secured, as by welding, to the upper end of each of the legs 5, 6, 1, 8, for

projection beyond the end margin thereof, is a short angle section 13 (see Figure 8).

Removably secured by bolts l3 to the section [3 on each of the legs 7, 8, are the lower ends of leg members l5, l5, respectively, of a motor support section C. The legs I5, (6, are in alignment with the legs I, 8, respectively, and thus, converge at their upper ends (see Figure 1) and are braced adjacent thereto by a connecting bar I! welded at its ends to the legs l5, 15. Each pair of legs l5, l 6, is connected by a longitudinally extending member 18 and connecting the legs 16 and I6, I and I5, are transversely extending members l9, said members It, IS, being welded at their ends to the legs they respectively connect. Mounted upon the members 18 and extending transversely thereacross to form a platform is a pair of spaced parallel channel bars 20 projecting outwardly beyond the member l8. It should be noted that legs 1, 3, l5 and I8 and the platform formed by members/l8, I9 and 20 constitute a rigid A-frame. Upon the projected portions of the bars 25 there is secured, as by bolts, a prime mover 2|, such as an electric motor or small gasoline engine having a drive shaft 22 upon which is mounted a pulley 23 drivingly connected by a belt 24 to a relatively large pulley 25 suitably fixed upon a shaft 26 journaled in bearing mounts 2'! which are secured as by bolts upon spaced, longitudinally-extending channel bars 28 secured at one end to the member [9 and its other end to the bars 25. Fixed upon one end of the shaft 26 is a sprocket wheel 29 connected by a chain 30 to a sprocket wheel 31 suitably mounted upon one end of a shaft 32 which is journaled in bearing mounts 33 secured by bolts 34 to the rearwardly presented faces of the legs 16 (see Figure 11). Mounted upon the other end of the shaft 32 is a sprocket wheel 35"which engages the lower loop of a chain 35, the upper loop of which engages a sprocket Wheel 37 fixed on one end of a shaft 38. Said shaft 38 is journaled in bearing members 39 suitably secured by bolts to flanges 40 of support brackets 4| suitably secured, as by welding, to the underface of the rearward end of each of a pair of downwardly and forwardly inclined, spaced, parallel, inwardly- opening channel members 42, 43, of a conveyor-support section D. The channel members 42, 43, are supported by angle members 44, 45, respectively, the end portions of the channel members 42, 43, extending beyond the ends of the angle sections 44, 45, respectively. Welded to the outer faces of each of the angle sections 44, 45, are preferably three spaced, relatively short angle sections 45, 41, 48, which are horizontally disposed in parallel relation to the ground or supporting surface. The horizontal flange of each of the sections 46, 41, 48, is provided with an aperture 49 for receiving a bolt 50 which extends through an aligned aperture 5| in a projecting plate member 52 welded to the outer face of the channel members 42, 43 (see Figure 7) for secure maintenance thereof within the angle sections 44, 45, respectively.

Secured, as by welding, to the under margin of the vertical flange of the sections 47, 48, and to the adjacent surface of the angle members 44, 45, are the upper ends of downwardly extending leg members 53, 54, respectively, and similarly secured to the vertical flange of the section 46 are the superimposed upper ends of leg members 55, 55. The legs 53, 54, are in alignment with the legs 5, 6, respectively, of the main frame section B and are detachably secured at their lower ends by bolts l3 to the members [3 mounted on the upper ends of the legs 5, 5. The leg members 55, 56, are respectively aligned with the legs l5, it, of the motor support frame C and are secured to the sections 13 mounted on the upper ends of said legs l5, 16. Intermediate the short sections 48, 47, and 41, 46, there are pinned to the outer face of the channel members 44, 45, the superimposed upper ends of brace members 51, 53, and 59, 60, respectively. At'their lower ends, the braces 51, 58, are secured, as by welding, to the legs 54, 53, respectively, the brace 59 being also similarly secured to the leg 53. The brace member 65 is removably attached by a bolt I3 to an angle section l3 projecting forwardly and upwardly from the leg I5 of the motor support section C (see Figure 1). It will thus be seen that upon removal of the loop 36 from the sprocket 3'! the conveyor-support section D may be readily detached from the main frame section B and the motor support section C by disengagement of bolts 13' joining the sections 13 on the legs 5, 5, l5, (5, to the legs 54, 53, 55, 55, and the brace member 50.

Welded to the underface of each of the channel members 42, 45, at their forward ends, is a depending plate member Bl, 6| respectively, having outwardly turned flanges 62, 62', respectively, at their lower margins suitably apertured for receiving bolts 58 for securement to hearing members 64, 54, respectively, which support a shaft 65 having a wheel 66 mounted thereon. About the wheel 56 there is engaged one loop of an endless belt 5'1, the upper loop of which is engaged about a Wheel 66 mounted on the shaft 58. Provided upon the outer face of the belt 51' is a plurality of spaced, three-sided bucket members 69. Disposed suitably upon the top surface of the channel members 42, 43, adjacent their lower ends, is a hopper (0 through which material to be graded is discharged into the buckets 59 of the belt 51.

Approximately intermediate their length the angle members 44, 45, are connected by a plurality of cross bars H which are secured at their ends in the angle members 44, 45. Welded to the top surfaces of the cross bars H- is a plate 12 which curves downwardly at its ends, as at I3, i4, beyond the bottom surface of the angle members 44, 45. Said plate 12 thus provides a centrally disposed sustaining surface for the belt 61 as it progresses upwardly.

Secured by bolts '85 to the top surfaces of the upper ends of the channel members 42, 43, is the forward margin of an arcuate, deflector-guard member 16 which is spaced rearwardly of the upper loop of the belt 67 and terminates spacedly therebelow.

Bolted to each of the legs [6 of the motor support frame C are brace members 11, TI, respectively, of a screen support section E which at their lower ends are secured, as by welding, to the forward ends of frame members 18, 18', respectively, which incline upwardly and inwardly with their rearward ends terminating beneath the plane of the upper ends of the angle sections 71, H. Said members 18, 18, are connected to longitudinally extending angle members 19, 19', respectively, which, having their horizontal flanges projecting outwardly, are secured at their forof the difference in height of the upper ends of the members 77, IT, and 19, I9. Extending transversely between the angle members 19, "I9", adjacent their forward and rearward ends are cross members 89, 80, respectively, fabricated also of angle iron and having their horizontal flange portions projecting inwardly (see Figure 11). Mounted spacedly on the vertical flange of each of the angle members 19,- 19', is a plurality of inwardly projecting stub shafts 8| having rollers 82v disposed on their inner ends. Said rollers 82 supportingly engage the under surface of the horizontal flange of longitudinally extending angle sections 83, 83', of a screen holder 84. The upper margin of the verticaliilange of each of the sections 83, 83, is engaged by relatively small rollers. 85 mounted on the inner ends of stub shafts 8E- journaled in bearing brackets 8'! spacedly welded to the outwardly projecting horizontal flange of the members. I9, I9 (see Figure The angle sections; 83, 83', are connected, as by welding, at their forward ends, to the ends of a transversely extending frame member 88. Mounted. at their lower endsinv the corners thus formed by the sections 83, 8'3", and the member 88- are upstanding posts 89, 89. Mounted in the upper endsv of said members 89, 9.9 and rojecti-ng laterally therefrom are arms St, to, respectively, to the outer ends of which. are secured one end of links 9i, 9I", respectively. Said links 9!, 9I are eccentricall-y pinned at their other ends to the. sprocket wheels 3!, 35, respectively. Secured to the forward ends of themembers 83, 83', are upstanding posts 92, 93, respectively. The upper end of the post 92 is in horizontal alignment with the upper end of the post 89 whereas the post 93 is relatively shorter. Connecting the upper ends of the posts 92, 93, and 92, 89, are angle members 94, 95, respectively, having their horizontal flanges projecting inwardly. Because of the difference in height of the posts 92, 93, the angle member as will be disposed at an angle to the horizontal and the longitudinal flange 95 of the member 95 (see Figure 10) projects inwardly substantiall in a plane parallel to the member 94, for reasons appearing more fully hereinafter. Extending between and suitably secured at the ends to the upper end of the post 89 and a point approximately midway the length of the post 39' is an angle member 96 which is thus disposed at a slightly greater angle to the horizontal than the member 94!. The horizontal flanges of the members 95, 95, 96, provide securement surfaces for a relatively coarse rectangular screen 91 which slants downwardly toward its unattached, open side due to the inclined disposition of the members 94, 96. It will thus be seen that the vertical flanges of the members 94, 95, 96, provide a rim around the screen 97. At its unattached or open side the screen 91 communicates with a downwardly projecting chute 98 suitably secured, as by welding, to the posts 93, 89', and supported by brackets 99, welded to the angle member 83.

Secured on three sides, at its margins, to the horizontal flanges of the members 83, 83', 88, is a rectangular screen Hi9 of finer mesh than the screen 91, being unattached or open at its rearward end for communication with a chute IIJI suitably secured to the members I8, 18. Secured at its upper margins, as by welding, to the members I9, I9, is a depending chute I02. It will be noted by reference to Figures 10 and 11 that the lower screen I99 is not parallel to the screen 91 but extends transversely in a substantially horizontal plane and longitudinally in an inclined plane, whereas the screen 9'] extends transversely 6. inan inclinedplane and longitudinally in a substantially horizontal: plane.

V In use, the gravel-cleansing machine'A is dis-'- connected or broken down into its several. component sections B, C, D, E, as shown in Figure: 1 2. and: the separate sections are separately hauled up to the roof being repaired and there assembled for cleansing operations, thereupon, the motor I9 is set in motion causing the belt 6! to travel about the wheels 66, 68, by rotation of the pulley 25 and sprocket wheels 3I, 35, and 31. The material to be screened, such as gravel and the like, is then poured into the hopper H3 and is conveyed by the buckets l9 upwardly and discharged therefrom downwardly upon the screen 91. Rotation of the sprocket wheels 3|, 35, causes the links 9|, SI, to be rotated eccentrically thereby imparting a'reciprocating vibratory motion to the screen holder 8 1, along a path determined by the rollers 82, 85. The deflector member it directs the material onto the screen 91 where,through the vibratory action, the material caught thereby will be shaken or bounced downwardly toward the open side of said screen 97-, onto the chute 99 and thence into any suitable collector which may be provided. The material passing through the screen 91 will descend upon the screen H39 and the portion thereof which sifts through will drop downwardly throughthe chute I02 for collection. The material tailingv to pass. the screen I93 will, due to the vibratory action and to the rearward'inclination of said screen I00, be shaken or bounced to the rearward, open side of the screen I09 and onto the chute HH for ultimate collection. Thereby three grades of material are provided. It is obvious that additional screens may be provided at varying angles with the horizontal for presenting a greater number of grades of material.

It will thus be seen that the gravel cleansing machine A is comprised of the four sections, namely, main frame B, motor-support C, conveyor-support D, and screen-support E. As shown hereinabove, these various sections are detachable one from the other by the simple expedients of loosening the appropriate bolts. The screen support section E may be removed by loosening the bolts securing the members TI, TI, to the legs I6 of the motor-support section C and by slipping the rearward ends of the links 9|, 9i, off the arms 9|], respectively. The motor-support section 0- may be, after detachment of the conveyor-support section D, as hereinabove described, disconnected from the main frame B by merely loosening the bolts I3 which secure the pair of legs I5, IE, to the angle sections I3, which are welded to the upper ends of the pair of legs i, 8, respectively. Thus, simple and convenient handling is provided for transporting the machine A from place to place since relatively little man power is required to lift onto, and remove from, trucks and the like, the various sections B, C, D, and E.

This knockdown quality of the machine A thus greatly increases its range of utility as it can be carried to and assembled at locations which hitherto have presented difliculty.

It should be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the gravel cleansing machine may be made and substituted for those herein shown and described without departing from the nature and principle of my invention. For example, where small scale roof repairing operations or considerations of low initial investment are involved, it is possible to omit the conveyor and merely employ the central base and frame sections on which the prime mover is mounted and attach to one side thereof the screening device and its associated discharge chutes.

Having thus described my invention what I claim and desire to secure by Letters Patent is:

A portable gravel cleaning machine of the knockdown type comprising an elongated skeletonized main frame having a pair of spaced upstanding end legs at the forward end and transversely aligned pairs of converging legs, a motor support section comprising a horizontal platform and transversely aligned pairs of downwardly diverging legs adapted for connection at their lower ends to the upper ends of the converging legs for co-operation therewith to form a rigid A-frame, said platform being secured to the legs of said section near their lower ends, a prime mover mounted on said platform, a conveyor support section comprising a frame having spaced depending members, the forward depending members being aligned with the end legs of the main frame and being detachably secured thereon, the rearward depending members being secured to the apex of the A- frame, an endless belt disposed on the frame of the conveyor support section, means drivenly engaged to the prime mover for moving the endless belt, a screen support section comprising a frame removably secured to the motor support section and extending rearwardly therefrom,

rollers carried by said frame, a screen holder mounted upon said rollers, and means for reciprocating said holder on said rollers.

PHILIP M. FINGER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date D. 154,032 Ernst June '7, 1949 134,643 Clarke Jan. 7, 1873 267,049 Wilson Nov. 7, 1882 345,479 Bradley July 13, 1886 678,819 Watkins July 16, 1907 1,050,730 Fredrickson Jan. 14, 1913 1,080,072 Mold Dec. 2, 1913 1,098,946 Gardie et a1 June 2, 1914 1,125,898 Campodonico Jan. 19, 1915 1,174,711 Green Mar. 7, 1916 1,214,674 Harris et a1. Feb. 6, 1917 1,218,782 Larkin Mar. 13, 1917 1,363,762 Davison Dec. 28, 1920 1,385,957 Van Etten July 26, 1921 1,431,270 Thompson Oct. 10, 1922 1,432,738 Alwart Oct. 24, 1922 1,628,455 Deister May 10, 1927 2,446,472 Graf Aug. 3, 1948 2,525,023 Ensminger Oct. 10, 1950 FOREIGN PATENTS Number Country Date 371,153 Germany Oct. 22, 1921

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