US2757779A - Unscrambler construction - Google Patents

Description

Aug- 7, 1956 D. R. MGKUNE 2,757,779

UNSCRAMBLER CONSTRUCTION ug 7, 1956 D. R. MCKUNE 2,757,779

UNSCRAMBLER CONSTRUCTION Filed March 19. 1951 2 Sheets--Sheefu 2 j 2,750,779y lUNSCRAlVIBLER CONSTRUCTION Duane R. McKune, Dunedin, Fla., assignor, by mesne assignments, to .Brogdxv Company, 'Orange County,

Fla.,a'corporation of Florida Application Marcil l1S), 1951, Serial No. 216,387 14% Claims# (CI. 198-30) Thel present invention relates generally to unscrambler constructions, .and more particularly to'a'n unscrambler construction incorporating a can positioning device adapted selectively to rotate cans of non-round configuration to a predetermined position for single file delivery from the unscrambler,construction.

In brief, the present unscrambler construction comprises a feed belt assembly, a transition plate, a rotating assembly, -a retaining assembly, and a can positioning device including two separate belt assemblies adjustably spaced apart and moving at different rates of speed. The belt assemblies'are so positioned relative to each other and relative .to a can displacing device included in the rotating assembly as to induce `a rotative effect upon cans of non-round configurationy when such cans are carried in an undesired position into vcontact with the belt assemblies so that they may be readily discharged in single file. The belt assemblies may be drivenl either from the can displacing l' device by frictional meansy or, alternatively, by one or more separate prime movers.

It is an object of the present invention to provide an unscrambler construction incorporating a novel can positioning device which cooperates with a can displacing device to provide `for the delivery of non-round cans therefrom in uniforms-ingle iile alignment.

It is another object of, the invention to provide an unscrambler construction incorporating a novel can positioning device which is adapted to rotate moving cans of non-round conguration to a desired position.

lt is another object to provide anunscrambler construction incorporating a ynovelcan positioning device which comprises two belts adapted to move at different rates l United States `Patent(l)l of speed and so arranged as, to contact` opposite sides of a moving can of non-round configuration to produce a desired rotation of the can. A f

, It is another object to provide an unscrambler construction incorporating a novel 1can positioning. device having twoseparate belt assemblies, each adapted` to be driven through frictional engagement with a can displacing device.

.It is another object to provide an unscrambler construction incorporating a novel can positioning device having two separate belt assemblies adapted to be driven at different rates of speed by separate prime movers.

It is another object to provide a novel can positioning device for attachment to a known type of unscrambler construction. t

Other objects are to provide a novel can positioning device for cooperation with a known type of unscrambler construction for disposing cans of various cross sections in single ille, which device is relatively inexpensive, which is efficient in itsl action, which is economical to operate, .which reduces to a minimum the needfor manual supervision, and which is otherwise adapted to fulfill the objects and advantages soughtrtherefor.

The foregoing and other objects and advantages are apparent from the following description taken with the accompanying drawings, in which:l j

Fig. l-is a plan view of an unscrambler construction incorporating 4a can positioning device built in accordance withvthe teachings of the present invention, various portions unessential to the presentdisclosure being broken away for conservation of space;

y 2,157,719 Patented A ug. 7, 1956 Fig. 2 is a side elevational view thereof; v

Fig. 3 is an enlargedfragmentary vertical cross-sectional view taken generally along the line 3-3 of Fig. 1;

Fig. 4 is anenlarged ,fragmentary vertical cross-sectional view taken generally along the line 4 4 of Fig. l;

Fig. 5 is .an enlarged fragmentary vertical cross-sectional view taken generally along the line 55 of Fig. 1;

' Fig. 6 is a fragmentary horizontal cross-sectional view, taken generally along the line 6-6 of Fig. 5;

Fig. 7 is a fragmentary'plan View of an unscrambler construction incorporating a modification of the can positioning device shown in Figs', 1 through 6; and

Fig. 8 is a side elevational-iview thereof.

Referring to the drawings' more particularly by reference numerals, 15 indicates generally an unscrambler construction incorporating a@ Vcan ,positioning ldevice 16 built in accordance with the teachings of the present invention. Asis clear frornnFigs. l and 2 ofthe drawings, the unscrambler construction 1S comprises, in addition to the can positioning device 16, a supporting frame 17, a feed belt assembly 18, atransition plate. 19, a rotating assembly 20, and a retaining assembly 21.

The supporting frame 17 lis preferably constructed of angle iron 'and includes parallel vrail members 25 supportedby vertical strut'sl26. `At` one end of the supporting frame 17, a horizontal arcuate strap member 27 is secured to the two end struts 26 by'means of lugs 28 welded to the member 27 and secured either by welding or bolting to these struts 26.

The feed belt assembly 18 comprises a movable conveyor belt 30 driven'by conventional'means (not shown) connected to a shaft Y31 supported by trunnon bearings 32 and carrying a drum 33 over which the belt 30 passes. The upper run of the belt 30 may vbe further supported by transversely extending bars 34 appropriately secured to the rail members 2 5. Parallel retaining guides 35 are disposed adjacent theside edgesy of the`upper run of the belt 30 and are supported from the rail members 2S by means of appropriate brackets 37.

The transition plate 19, shaped as clearly shown in Figs. 1 and 2, is supported on block members 40 resting on the rail members 25 so as to dispose the upper surface at the level of the upper surface ofthe conveyor belt 3i).

The rotating assembly 2t) includes a can displacing device in the form of a disc-like table 45, theperiphery of which is disposed adjacent an arcuateedge 46 of the transition plate 19, the upper surface of the table 45 being at the same level as the upper surface of the plate 19. The table 45 is securely mountedupon a flanged hub 47 appropriately secured to a driven shaft 48 and is thus adapted for continuous rotation in the direction indicated by the directional arrows Al of Fig. l. The shaft 48 is rotatable by conventional power means (not shown) and is in part supported by a trunnon bearing 49 mounted on a channel 50 extending between the two end struts 26. The peripheral edge of the table'45 has a depending flange S1 which is beveled to forma wedge-shaped rim 52, as clearly shown in Fig. 4, for a purpose to appear.

The retaining assembly 21 comprises an arcuately bent retaining plate 55 disposed adjacent a peripheral portion of the rotating assembly 20 and supported by one or more vertical channels 56 welded to the arcuate member 27. A receiving end 57 of the retaining plate 55 is appropriately connected to one of the guides 35 of the feed belt assembly 18. It will be noted that the plate 55 extends from this guide 35 .around a portion of the table 45 so as to disposed an end 58 adjacent a portion of the can positioningconstruction 16, as clearly shown in Figs. 1 and 2 of the drawings.v v t The can positioning device 16 comprises an inner belt assembly 60 and an outer belt assembly 61, each of these assemblies being adapted forcontinuous operation independently of the other, as will appear. The inner belt assembly includes a welded 'bracket 62 secured to one of the rail members 25` by means of nut and bolt assemblies 63 and comprising a vertical plate member 64 and a horizontal plate member `65. A tube 66, preferably of square cross section, has a nut `67 welded to one of its ends, as best shown in Fig; 4. A sleeve 68, welded to the outside of the tube 66` intermediate the ends thereof, provides means for adjustably mounting the tube 66 to the upper surface of the horizontal plate member of the bracket 62, a nut and bolt assembly 69 being employed to maintain ,the tube 66 in its adjusted position, the bolt thereof passing vertically through the sleeve 68 and the plate member 65 (Figs. 1 and 2). A square bar 70, having a stub shaft 71 welded at right angles thereto, has the greater portion of its length slidably disposed within the tube 66 (Fig. 4). A compression spring 72 in the tube 66 acts between the received end of the bar and a plug 73 backed by a cap screw 74 threadedly received in the nut 67, thereby providing adjustable means biasing the stub shaft 71 in a direction away from the tube 66. The horizontal ange of the appropriate rail member,25 may be notched as clearly indicated in Fig. l to provide clearance for the shaft 7l. A grooved idler wheel 75 containing a bushing 76 is rotatably mounted upon the stub shaft 71, being retained thereupon by a washer 77 and a nut 78. Thus mounted, the idler wheel is' adjustably biased into engagement with the wedge-shaped rim 52 of the table 45, and it is apparent that the frictional engagement thereby effected will cause the' idler wheel 75 to rotate when the table 45 rotates.

The horizontal plate member 65 of the bracket 62 also supports a vertically disposed stub shaft which is secured thereto by means of a nut 86 threadedly engaging a reduced lower end thereof and which rotatably mounts a drive pulley 87 shaped as clearly shown in Fig. 3. An upper reduced portion 88 of the stub shaft 85 adjustably receives an L-shaped clamp member 89 having one end of a preferably square horizontally disposed tube 90 welded to a depending portion thereof, as best shown in Figs. l and 3. The tube 90 slidably receives a bar 91 to one end of which is welded a vertical stub shaft 92 mounting an idler pulley 93 retained on the shaft 92 by a washer 94 and a nut 95. A belt 96 mounted in the grooves of the driven pulley 87 and the idler pulley 93 may be adjustably tensioned through the slidable cooperation of the bar 91 and the tube 90, the latter having an aperture 97 over which a nut 98 is welded which receives a setscrew 99 for maintaining the adjusted tension of the belt 96. rIlle position of the belt 96 relative to the center of rotation of the table 45 is adjustable through the pivotable connection of the clamp member 89 with the portion 88 of the stub shaft 85. A cap screw 103 is provided to maintain this adjusted position. A V-shaped deecting bar 100 is also welded to the tube 90 so as to extend horizontally therefrom generally in the direction of rotation of the table 45, as clearly shown in Fig. l. It will be noted that a wedge-shaped portion 102 of the drive pulley 87 engages the grooved idler wheel 75 so as to be driven by the latter.

The outer belt assembly 61 includes a double-grooved drive pulley 105 rotatably mounted on a stub shaft 106 and retained thereon by a washer and a nut 108. The drive pulley` 105 has a lower grooved section 107 engaging the wedge-shaped rim 52 of the table 45 so as to be driven thereby as the table 45 rotates. The stub shaft 106 is welded adjacent one end of a bar 109 which, as best shown in Figs. 1, 5 "and 6, is horizontally received in a preferably square tube 110. The tube 110 has a nut 111 welded to one of its ends so as to receive a cap screw 112 for abutment with the received end of the bar 109. Two lugs 113 welded to the bottom of the tube 110 depend therefrom so as to straddle a cap screw 114 which is threadedly received in a supporting channel seg- .4 ment 115 welded to the arcuate member 27 of the support 17. Two washers 116and' an `interposed "spring 117 are received on the ca! screw 114 intermediate the head thereof and the depending lugs 113, this arrangement serving adjustablytobias the tube 110 and, therefore, the drive pulley 107 `in a direction toward the table 45. f

A plate bracket 120 welded to thechannel member 115 and to the arcuate member 27 supports a stub shaft 121 mounting an idler pulley 122 retained by a washer 123 and a nut 124. Due to the normal direction of rotation of the pulley 122, as will appear, the stub shaft 121 is secured to the bracket 120 by means of both a nut 125 and a jamb nut 126. It will be noted that a portion of the tube 110 rests upon the bracket 120 and, further, that the tube 110 is4 disposedl adjacent to that sideof the stub shaft 121 which is away from the table 45 so that the shaft 121 may serve as a fulcrum when the drive pulley 105 is biased into engagement with the table 45. A belt is disposed in the `grooves of the drive pulley 105 and the idler pulley 122 and may be tensioned by adjustment of the cap screw 112 in abutment with the bar 109 as aforementioned.

It is to be observed that, while provision is made for retaining the idler wheel 75 and the drive pulleys 87 and 105 each on its respective shaft, each of the shafts 71, 85 and 106 is of sufficient length to permit substantial unobstructed vertical movement of the rotatable element mounted thereon. Such an arrangement provides for continuous appropriate alignment between parts in moving engagement and thus overcomes such problems as warpage of the table 45, for example.

Operation The present unscramber construction 15 is driven by conventional power means (not shown) in power transmission connection with both the feed belt assembly 18 and the rotating assembly 20. It will thus be seen that,

' as the conveyor belt 30 and the table 45 are caused to move in the directions indicated by the arrows A and B on Fig. 1, both the'inner belt assembly 60 and the outer belt assembly 61 are activated by their frictional contact with the wedge-shaped rim 52 of the rotating table 45.

' The aforementioned manner of mounting the idler pulley 75 provides for the manual manipulation of this pulley to a position wherein it has frictional contact with both the wedge-shaped rim 52 and the wedge-shaped portion 102 of the drive pulley 87. Thus positioned, the idler pulley 75 is adjustably biased by means of the spring 72 to maintain adequate driven and driving relationships with the table 45 and the drive pulley 87, respectively. The belt 96, properly tensioned as aforementioned, is thus caused to move continuously in a direction such that the run farthest removed from the center of rotation of the table 45 moves generally in continuation of the rotating movement of the table 45. Similarly, the belt assembly 6l is actuated through spring-biased contact of the grooved section 107 of the drive pulley 105 with the wedge-shaped rim 52 of the rotating table 45. It will be noted, however. that the run of the belt 130 which is nearest the center of rotation of the table 45 moves generally in continuation of the rotational movement of the table 45. Thus, adjacent runs of the belts 96 and 130 move generally in the same direction and, as aforementioned, in general convinuation of the rotative movement of the table 45.

The width of spacing between adjacent runs of the belts 96 and 130 is adjustable by pivotal movement of the clamp member 89 about the stub shaft 85. It is desirable in the operation of the can positioning device 16 that these adjacent runs be disposed substantially in parallel relation to each other, which can be accomplished regardless of the width of spacing therebetween by proper selection of the size of the pulley 93. The spaced relation of adjacent runs of the belts 96 and 130 denes a discharge channel through which cans or `similar articles may be moved, as will appear. i

It is obvious that the size of the pulley 93 will have no eiect upon the linear speed of the belt 96. Normally, the speed of the belt 130 is maintained about 25% greater than that of the belt 96, this difference in speed being achieved by proper selection of the various pulleys.

As can readily be seen from Fig. 1, non-,round cans 135, or the like, may be placed in masses or scattered on the upper surface of the conveyor belt 30 for advancement toward the rotating table 4 5.' As the cans are pushed across the transition plate 19 onto the table 45, they are, of course, subjected to the rotational movement of the table 45 and are also moved outwardly thereon by centrifugal force so as to tend to align themselves against the retaining plate member 55. With the adjacent runs of the belts 96 and 130 spaced apart a distance'a little greater than the narrow dimension of the cans 135, it is clear that cans introduced therebetween by the rotating table 45 can be further advanced only when brought forward in a position to present the narrow dimension for admittance to the discharge channel deined bythe belts 96 and 130. If any can is not so presented, it will, upon being engaged by the belts 96 and 130, be'rotated von its vertical axis due to the difference in linear speed of the two belts and upon attaining a desired position will be free to pass between the belts and be discharged from the rotating table 45.

Should any can fail to be carried to a position from which it can enter the discharge rchannel between the belts 96 and 130, it will be carried by the table 45 into abutment with the deiiector bar 100 and 'will be deected inwardly toward the center yo f rotation -of the fable 45 so as to bypass the approaching mass of cans from the conveyor belt 30 and will thus be given another opportunity to be properly positioned and discharged from the unscrambler construction 15.

Figs. 7 and 8 show a modied attachment type can positioning device 140 in which an inner belt assembly 141 and an outer belt assembly y142 include separate prime movers 143 and 144, respectively. The can positioning device 140 is illustrated attached to an unscrambler construction 145 which includes a `rotatable table 146 not having a wedge-shaped rim such as 52 on the table 45 of the unscrambler construction 15. The remaining structure of the unscrambler .construction 145, however, may be substantially identical lto that of the construction 15, and it will be observed that like elements in the construction 145 are given like numbers distinguished by the addition of a prime.

The prime movers 143 and 144, here shown as electric motors, may be identical and each is appropriately mounted to the supporting frame 4177', as clearly shown in Figs. 7 and 8 of the drawings. Each of the prime movers 143 and 144 has a shaft extension 150 secured to its extended power shaft, being thus adapted to causerotation of pulleys 151 and 152, respectively keyed to these shafts 150. The pulley 151, driven by the prime mover 143, is normally smaller in diameter than 'the pulley I152, vdriven by the prime mover 144, it being thus apparent that the belt 96', driven by the pulley 151, will have a lesser linear speed of travel than the belt 130', driven by the pulley 152.

The pulley 122', preferably equal in size to the pulley 152, also engages the belt 130 and is rotatably ymounted on a stub shaft 156 supported on a slotted bracket 160 welded to the arcuate strap member 2.7' `of the supporting frame 17. A cap screw 161 is threadedly received in the bracket 160 so as to dispose its received end in a s'lot 162 and in abutment with the shaft `156, thereby providing means for adjusting the tension of the belt 130'. A jamb nut 163 is provided to maintain the adjusted position of the shaft 156.

Means for supporting the pulley 93' which cooperates with the pulley 151 to support the belt 96 may be, as shown, identical with the means for supporting the pulley 93 in the inner belt assembly 60 of the can positioning device 16, except for the support of the clamp bracket 89 which corresponds to the clamp bracket '89 in the assembly 60. In the present device 140, the clamp bracket 89 is adjustably mounted on a depending stub shaft 165 secured in a clamp block 166, the latter being in turn adjustably mounted on a Vertical stub shaft 167 welded to the rail member 25 of the supporting frame 17". Such an arrangement not only permits the inner belt assembly 141 to be operationally adjusted in the same manner as the inner belt assembly 60 of the device 16, but also provides for adjustment of the deiiector bar relative to the belt 96'.

It may be readily seen that the operation of the un- Scrambler construction in handling cans or the like is identical with that of the construction 15, above described.

Clearly, there has been provided an unscrambler construction which fulfills the objects and advantages sought therefor.

It is to be understood that the foregoing description and the accompanying drawings have been given by way or the like in masses for advancement toward the can positioning means, means for advancing the cans to the vicinity of the can positioning means, means for aligning at least a portion of the cans in single le during said advancement, and means for dei'lecting any remaining cans from the vicinity of the can positioning means for readvancement to the vicinity thereof, said can positioning means comprising spaced beltsfor engaging opposite sides yof a moving can, said belts being movable at different speeds in the same direction. y

2. An unscrambler construction comprising, in combination, horizontally rotatable can displacing means, and can positioning means for cooperation with said can displacing means, said can positioning means including a plurality of differentially movable elements for engaging opposite sides of a moving can, said elements having respective adjacent portions disposed linearly in substantially parallel spaced relation to each other.

3. An unscrambler construction comprising, in combination, horizontally rotatable can displacing means, and can positioning means for cooperation with said can displacing means, said can positioning means including a plurality of diiferentially movable elements for engaging opposite sides `of a moving can, said elements having respective adjacent portions disposed linearly in substantially parallel spaced relation to each other, means for supporting said elements including means 'for adjusting the spaced relation thereof, and means for driving said elements in differential movement.

4. An unscrambler construction comprising, in combination, horizontally rotatable can displacing means, can positioning means for cooperation with said can displacing means, said can positioning means including a plurality of differentially movable elements for engaging opposite sides of a moving can, said elements having respective adjacent portions disposed linearly in substantially parallel spaced relation to each other, means for supporting said elements including means for adjusting the spaced relation thereof, and means for driving said elements in differential movement, said latter means including rotatable elements in driven engagement with said can displacing means.

5. An unscrambler construction comprising, in combination, horizontally rotatable can displacing means, can vpositioning means for cooperation with said can displacing means, said can positioning means including a plurality of differentially movable elements for engaging opposite sides of a moving can, said elements having respective adjacent portions disposed linearly in substantially parallel spaced relation to each other, means for supporting said elements including means for adjusting the spaced relation thereof, and means for driving said elements in differential movement, said latter means including a prime mover.

6. An unscrambler construction comprising, in combination, horizontally rotatable can displacing means,

` can positioning means for cooperation with said can displacing means, said can positioning means including a plurality of differentially movable elements for engaging opposite sides of a moving can, said elements having respective adjacent portions disposed linearly in substantially parallel spaced relation to each other, means for supporting said elements including means for adjusting the spaced relation thereof, and means for driving said elements in differential movement, said latter means including a prime mover for each of said elements.

7. An unscrambler construction for non-round articles comprising, in combination, horizontally rotatable article displacing means, and article positioning means forcooperation with said article displacing means, said article positioning means including a first andy a second belt assembly, means for supporting said belt assemblies so as to define a discharge channel therebetween in predetermined relation with said article displacing means, said discharge channel having a width intermediate the maximum and minimum transverse dimensions of said nonround articles, a belt for each assembly, and means for driving the belts at different rates of speed.

8. An unscrambler construction for non-round articles comprising, in combination, a round table mounted for rotation in a horizontal plane, a rotatable idler wheel in driven engagement with the table, a first drive pulley in driven engagement with the idler wheel, a second drive pulley in driven engagement with the table, an idler pulley for each drive pulley, a belt for each drive pulley, means for independently adjusting the tension of the belts, and means for disposing adjacent linear runs of the belts in substantially parallel predetermined spaced relation to each other, said spaced relation being intermediate the maximum and minimum transverse dimensions of said articles.

9. An unscrambler construction for non-round articles comprising, in combination, a round table mounted for rotation in a horizontal plane, and article positioning means including a first and a second vertical shaft outside the periphery of the table, a drive pulley on each shaft, an idler pulley for each drive pulley, a belt for each drive pulley, means for independently adjusting the tension of the belts, means for disposing adjacent linear runs of the belts in substantially parallel predetermined spaced relation to each other, and means for rotating said drive pulleys in respectively opposite directions.

10. An unscrambler construction for non-round articles comprising, in combination, a round table mounted for rotation in a horizontal plane, a first and a second vertical shaft outside the periphery of the table, a drive pulley on each shaft, an idler pulley for each drive pulley, a belt for each drive pulley, means for independently adjusting the tension of the belts, means for disposing adjacent linear runs of the belts in substantially parallel predetermined spaced relation to each other, and means including a prime mover connected to at least one of the drive pulleys for rotating said drive pulleys in respectively opposite directions.

l1. An unscrambler construction comprising, in combination, a round table mounted for rotation in a horizontal plane, a first and a second fixed vertical shaft, a third, a fourth, and a fifth horizontally movable vertical shaft, means supporting said third shaft for independent movement both radially of and pivotally about said `first shaft. means supporting said fourth shaft for independent movement both radially of and pivotally about said Cit second shaft, means, including pivot means, supporting said fifth shaft for independent linear and pivotal movement relative to said pivot means, a first, a second, a third, a fourth, and a fifth rotatable element on said first, second, third, fourth, and fifth shafts respectively, a first belt onf said first and third rotatable elements, a second belt on said second and fourth rotatable elements, adjustable means for biasing said fifth rotatable element into frictional engagement with both the periphery of said table and said first rotatable elementfand adjustable means for biasing said third rotatable element into frictional engagement with the periphery of said table.

, 12. vAn unscrambler construction comprising, in combination, a round table mounted for rotation in a horizontal plane, a first and a second fixed vertical shaft, a third,ra fourth,and a fifth horizontally movable vertical shaft, means supporting said third shaft for independent movement both radially of and pivotally about said first shaft, means supporting said fourth shaft for independent movement both radially of and pivotally about said second shaft, means, including pivot means, supporting said fifth shaft for independent linear and pivotal movement relative to said pivot means, a first, a` second, a third, a fourth, and a fifth rotatable element on said first, second, third, fourth, and fifth shafts respectively, a first belt on said first and third rotatable elements, a second belt on said second and fourth rotatable elements, adjustable means for biasing said fifth` rotatable element into frictional engagement with both the periphery of said table and said first rotatable element, and adjustable means for biasing said third rotatable element into frictonal engagement with the periphery of said table, said first, third, and fifth rotatable elements being vertically movable on their respective shafts.

13. An unscrambler construction comprising, in combination, a round table mounted `for rotation in a horizontal plane, first, second, third, and fourth vertical shafts, first, second, third, and fourth rotatable elements mounted on said first, second, third, and fourth shafts respectively, afirst belt on said first and second rotatable elements, a second belt on said third and fourth rotatable elements, means, including adjustable means, supporting said second shaft for movement both pivotally about and substantially radially of said first shaft, means, including adjustable means, supporting said fourth shaft for movement substantially radially of said second shaft, and means for rotating said first and third rotatable elements.

14. An unscrambler construction comprising, in combination, a round table mounted for rotation in a horizontall plane, first, second, third, and fourth vertical shafts, first, second, third, and fourth rotatable elements mounted on said first, second, third, and fourth shafts respectively, a rst belt on said first and second rotatable elements, a second belt on said third and fourth rotatable elements, means, including adjustable means, supporting said second shaft for movement both pivotally about and substantially radially of said first shaft, means, including adjustable means, supporting said fourth shaft for movement substantially radially of said second shaft, and first and second prime movers connected to said first and third shafts respectively.

References cned in uw.` sie of this patent UNITED s'rATEs PATENTS 1,273,470 Estes July 23, 1918 1,430,132' Wilberts Sept. 26, 1922 `2,047,106 `Lidberg July 7, 1936 2,437,721` Barganz Mar. 16, 1948 2,541,300 Silva Feb. 13, 1951 2,567,504 Becmer Sept. l1, 1951 2,629,481 Stover Feb. 24, 1953 `2,642,173 Wehmiller June 16, 1953 FOREIGN PATENTS 109,097 'Australia Nov. 23, 1939

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