US2478462A

US2478462A - Earth moving machine

Info

Publication number: US2478462A
Application number: US635722A
Authority: US
Inventors: Garald E Decker
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-12-18
Filing date: 1945-12-18
Publication date: 1949-08-09
Anticipated expiration: 1966-08-09

Description

G. E. DECKER EARTH MOVING MACHINE 8 Sheets-Sheet 1 Filed Dec. 18, 1945 E m 5 N #0 B gr. 0 T 0 1w W m p A Mj .0 M flr M MM @W% Y Z 1949- 1 G. DECKER 2,478,462

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' ATTO EY.

Patented Au 9, 1949 UNITED STATES PATENT OFFICE 18 Claims.

This invention relates to excavating apparatus and especially to such apparatus which is attachable to and operable by a tractor and which pushes a bucket or blade at its front for moving the earth from its path.

Objects of the invention are to provide, in apparatus of the class described, ((1.) improved means for scooping up the earth in front of the apparatus, lifting such earth and dumping the earth to one side of the apparatus; (b) improved means for securing to the apparatus the bucket or scoop, which means can also be used for securing to the apparatus the usual grading blade or the usual. bulldozer blade, thus making the apparatus usable for scooping and dumping earth, for bulldozer work or for ordinary grading; (c) improved means for elevating the apparatus, relative to the tractor, for the purpose of transportation between work locations; (d) improved means for raisin a loaded scoop or bucket; (e) improved means for moving or swinging a raised, loaded bucket from the front to the side of the apparatus; (1') improved means for swinging a loaded bucket outwardly and dumping the same distantly from the apparatus; (9) means which serve both for the moving or swinging of the loaded bucket to the side of the apparatus and for positioning, angularly to the line of travel of the apparatus, a grading blade or bu ldozer blade operatively secured to the apparatus in place of the bucket; (h) a rugged, eflicient and simply operable apparatus.

With the foregoing and other objects in view, all of which shall more fully hereinafter appear, the invention comprises certain novel constructions, combinations and arrangements of parts as will now be described and as defined in the appended claims and as illustrated, in preferred embodiment, in the accompanying illustrative.

drawing in which Fig. 1 is a side elevation view of the excavator with parts in position for movement from one location to another.

Fig. 2 is a front elevation view of the excavator with parts in position for dumping the load to one side.

Fig. 3 is a plan view of the excavator with parts in position for excavating operation.

Fig. 4 is a sectional view approximately on line 44 of Fig. 3.

Fig. 5 is a fragmentary sectional view substantially on line 5-5 of Fig. 3, excluding the bucket.

Fig. 6 is a fragmentary sectional view on line 6-6 of Fig. 5.

Fig. 7 is a fragmentary sectional view of line 1-1 of Fig. 5.

Fig. 8 is an elevational view on line 8-8 of Fig. 4.

Fig. 9 is a sectional'view on line 9-9 of Fig. 8.

Fig. 10 is a sectional view on line iii-48 of Fig. 8.

Fig. 11 is a fragmentary section taken on line I!H of F18. 3.

Fig. 12 is a fragmentary section taken on line l2-i2 of Fig. 11.

Fig. 13 is a fragmentary section on line l3--i3 of Fi 12.

Fig. 14 is a fragmentary plan view on line -44 of Fig. 4.

Fig. 15 is a section on line 15- of Fig. 14.

Fig. 16 is a fragmentary view taken on line Iii-l6 of Fig. 4.

Fig. 17 is a section on line lI-l'l of F 16.

The structure constituting this invention includes a base of generally U shape adapted for pivotal connection with a tractor generally indicated at T, the base comprising side bars 20 suitably connected, as by welding, with a semicircular channelled track 2|, the bars and track forming the U shaped base, the ends of the bars 20 being pivotally mounted on the tractor in alignment with the tractor rear axle as at 22.

A plate 24 serves as a base for operations later described and this plate is amxed to and supported by a frame comprising two side members 23, of approximately inverted V shape suitably mounted on the tractor, as by bolting thereto (not shown), with the apex portions of the V's inclined inwardly to converge at the plate 24, the inwardly inclined portions being indicated at 2311.

Rollable on semicircular track 2| and pivotally connected with plate 24 is a framework comprising a pair of opposed, channelled uprights 25 cross braced as at 2'3 and 26a and, at the bottom, by member 21 which serves, also, as a base for the jack which will be later described. This framework also includes a triangular rearwardly projecting element comprising a pair of horizontal members 28 and a pair of channel members 29 connecting the rear ends of members 28 with the tops of uprights 25, the

members

28 and 29 being afiixed to each other at their rear ends, as shown at Figs. 1, 2 and 4, and to the uprights 25 at their front ends and the two sides of this triangular element being suitably cross braced by described.

to plate 35 which bears upon plate 24 and is centrally pivoted thereto as at 36. This framework is supported on rollers 31, carried at the lower ends of uprights 25 and adapted to roll, and support the framework, on outer rail 2|a of track 2|, the rollers having flanges 38 adapted to hold the rollers on rail 2|a. The means for moving the framework along the track 2| around pivot 36 will be later described. Any suitable pendants 25a from uprights 25 for supporting the outer ends of rollers 31 may be provided indicated at Figs. 1, 2 and 6.

The rotative frame work, just described, resting on track 2|, and track 2| being integral with side bars 28, and these side bars being pivoted to the tractor at 22, it will be obvious that the assembly comprising bars 20, track 2| and uprights 25 and associated parts may be swung upwardly around pivot 22, when desired, as in case of transportation of the apparatus from one to another location for work. Any suitable device may be provided for raising the track, it being understood that raising the track will accomplish the raising of the assembly, just mentioned, out of operative position. The raising means found eflicient and illustrated in the drawing comprises a pair of jacks 39 hooked to bell crank levers 46, the other ends of the levers being linked to track 2| as by chains 4|. It will be obvious that, as illustrated at Fig. 1, when the just mentioned assembly is raised, the uprights 25 and associated parts will incline somewhat to the rear. This results in a change of position of member 28 and associated parts relative to plate 35, namely, a raising of member 28 above plate and a slight movement of member 28 toward the rear relative to plate 35. Both of the movements are provided for by the link 32 pivoted at 33 and 34 as above described.

The means for moving the uprights 25 and associated parts along semicircular track 2|, around pivot 36, will now be described, being illustrated at Figs. 1, 2, 4, 5, 6 and 7.

Aflixed to the lower front portions of uprights 25 are two channel members 42 each having an upward continuation 42a hinged thereto as at at 43 but otherwise unattached to uprights 25. The structure and function of the tracks 42-42a will be later described. The tracks 42 are connected, as later described, with the means for moving the uprights 25 around the track 2|.

Segmental member 44, having engaging means as holes 44a, is affixed to the framework, of which uprights 25 and tracks 42 form a part, by means of lugs 45 secured to blocks 46 by pins 41, the blocks 46 being affixed to tracks 42. Slight rotative movement of lugs 45 on pins 41 is allowed in order to take care of change in interrelative angularity of parts when the track 2| is raised into position for transportation as illustrated at Fig. 1. Obviously, the movement of segmental member 44 in either direction in line with track 2| will move tracks 42 and, therethrough, uprights 25 along track 2| in a semicircular path to the end of track 2| at the side of the tractor. The means for moving or swinging segmental member 44, to one side or the other, comprise a double pulley 48 mounted beneath the tractor for rotation in either direction and being encircled by

cables

49 and 50 connected with the tractors power take 011 and being adapted to be rotated in either direction according to which cable is pulled by the power take off. The pulley carries, on its under side, channel member 5| in which socket 52 is pivoted as at 53. Forked bar 54 telescopes in socket 52 and its tines 54a and 54b slidingly engage the top and bottom surfaces, respectively, of segmental member 44. Bottom tine 54b carries a pin 55 slidably mounted through the tine and normally forced upward, into contact with the under surface of segmental member 44, by resilient-means, as spring 56 and is positioned to automatically enter one of the holes 44a whenever the fork is swung to right or left as far as said holes. conventionally indicated at 51 is any suitable means, as an air jack, for operating any suitable means, as sliding loop 58, to retract spring 56 and thus withdraw pin 55 from hole 44a when desired.

Suitable means, as latch 59 pivoted as at 68 in the bumper-brace block, later described, normally drops into notch 6| in the inner rail 2 lb of track 2| and holds the uprights and associated parts on center, in normal excavating position. When it is desired to swing the uprights to one side or the other the latch may be lifted from the notch 6| by any suitable means as the conventionally indicated air jack 62 connected with the latch as at 63. Additional notches 6| may be provided wherever desired in rail 2": so as to lock the uprights (and the blade or bucket carried thereon and hereafter described) at any desired angle to the line of travel of the tractor.

An excavating bucket, or bulldozer or grading blade 68 is carried in front of the track 42-42n. in a seat 64, suspended on cables later described, on the opposite ends of which seat are brackets 65 carrying rollers 66 adapted to roll vertically in tracks 42--42a, the bucket or blade 68 being secured to the seat by suitable means according to the kind of blade or bucket to be used and the use to be made of the same. There is here illustrated an excavating bucket which is to be dumped and it is, therefore, illustrated as hingedly attached to seat 64 by pivots or hinges 61 in the lower ends of bracket 65, the bucket being normally held against the seat by catches 63 pivoted in the brackets 65 and adapted to normally engage the top edge of the bucket and hold it tightly in the seat. The catches are releasable by any suitable means as by air jack 10 mounted on block 10c and operatively connected with lever aflixed, through the pivot bar Ila, to catches 69.

Suitable means are provided to cushion the jolt or jar of the dropping or dumping of the bucket when the catch 69 is lifted and the bucket released. The preferred means illustrated in the drawing comprise cylinders 12 carried by brackets 65 in which cylinders are compression springs 13, the outer ends of which are engaged by head 14 of bar I5 within the coils of the springs and connected, at their other ends, with cables or chains 16 connected with the upper edge portion of the bucket as at 11 whereby, when the bucket falls outwardly the slack in the chain or cable will be taken up and the bar 15 will be drawn forward causing the head 14 to compress the spring and cushion the dropping of the bucket outwardly in the dumping operation.

Tracks 4242a, as previously indicated, normally lie against the front faces of uprights 25, the webs of these channeled track members facil'lg inwardly and their channels opening outwardly as clearly shown at Figs. 1, 2, 4 and 6 to 10, forming tracks in which the rollers 66 roll vertically and guide the bracket-seat-bucket assembly as it is raised or lowered by the means new to be described. It will be remembered that parts 42 of these tracks are afllxed to the uprights 25 while parts 42a are hingedly connected, as at 43, with parts 42 and, while the parts 42a normally lie against the front faces of uprights 25 in alignment with parts 42, they are free to be inclined outwardly on hinges 43 as clearly shown at Fig. 2.

Cross brace 21 (Fi 8) carries a suitable seat for telescoping-piston hydraulic jack 18, which seating may conveniently comprise ears 18a to accommodate base lug 181) secured therein by p-in 18c. Ram 19 of the jack carries on its upper end a bar 80 from the ends of which pins 8| project into slide blocks 82 adapted to slide vertically in the inwardly facing opposed-channels of uprights 25, pulleys 83 being rotatably carried by pins 8|. Pulleys 84 (Fig. 9) rotatable on pins 84a, are mounted on the inner faces of uprights 25 and in planes substantially coincident with pulleys 83.

The pins 94a are conveniently seated in blocks 85 affixed within the channels of uprights 25 and may be braced or reinforced in any suitable manner not shown.

A shaft 86 serves as a cross brace between the ends of tracks 42a and its ends project beyond the outer edges of the flanges of said tracks, as

at 86a, for purposes later described. This shaft carries pulleys 81 in substantially the same planes as

pulleys

83 and 84.

The bracket-seat-bucket assembly is raised alongtracks 42--42a by cables 88 secured to the lower rear faces of uprights 25 in any suitable manner as'to U bolts 89 (Fig. 9), and passing thence over pulleys 83, under pulleys 84, over pulleys 81 and thence to and secured, by any suitable means, as eye bolts 88a in the top edge of seat 64 as conventionally indicated at Fig. 13, whereby the actuation of jack 18 will raise bar 80 and its carried pulleys 83 thus raising the said assembly up along tracks 42-42a. It will be understood that jack 18, being a telescopingpiston hydraulic jack, will raise the bar 89 to the top of uprights 25 and as, by reason of the cable and pulley arrangement, just described, the said assembly will rise twice as fast as bar 80 and its pulleys 83, the raising of bar 80 from its normal position, shown at Figs. 8 and 9, to the top of the uprights 25 will raise the assembly the full length of tracks 4242a, namely, to 'the top thereof and ready for the tipping and dumping operation now to be described. I

Double acting jack 99 is pivotally mounted on pin 9|b seated in lugs 9|a carried by cross brace 9| between channel members 28 as clearly shown at Fig. 4. Ram 92 of this jack carries sliding cross bar 93 adapted to slide in the channels of members 29. Attached to cross bar 93 is a cross bar 94 carrying rollers 95 pinned to its ends by pins 96, which pins also pass through and hold the ends of side bar links 91, the other ends of which links are engaged by ends 86a of shaft 86 whereby when jack 90 is actuated to project its ram the cross bar assembly 93-94 will slide and roll along members 29 and links 91 will force tracks 42a forwardly into inclined position illustrated at Fig. 2. The reverse actuation of the jack 99 will, of course, retract tracks 42a to normal position in alignment with tracks. 42.

Bumper-brace biock 9a is positioned below the lower ends of uprights and between and dverlapping the rear faces of tracks 42, thus cross bracing tracks 42. The rear surface of this block is curved to conform to the front surface of track 2| as clearly shown at Fig. 6. A minute clearance between the block 98 and the track 2| is provided so as to avoid friction as the upright assembly is swung around the track 2| but, at the same time, to provide for the seating of the block 98 against the front surface of the track 2| when the blade or bucket 68 is being forced into the earth to be excavated, whereby the track 2| serves as an abutment against which the lower portion of the bucket-upright assembly rests, and

which in turn transmits the forward pressure of the tractor T, through block 98 and associated parts, to the bucket-seat assembly 84 to 68.

From the foregoing description it will be obvious that when it is desired to transport this apparatus from one point to another the actuation of the lifting jacks 39 will raise the assembly to the position shown at Fig. 1, wherein the bucket and other parts of the assembly will be well above any obstructions which would otherwise be encountered by the bucket in the course of such transportation. It will also be obvious that the lifting jacks 39 may be used for regulating the height of the bucket 68 for excavating purposes, or the height of a bulldozer or grader blade which may be seated upon the seat 64 in place of the bucket when it is desired to use the apparatus for bulldozer or grading purposes.

It will also be apparent from the foregoing description that when a grading or bulldozer blade is seated upon the seat 64, such blade may be positioned at any desired angularly to the line of travel of the tractor by rolling the assembly to one side or the other of the track 2| by the swinging mechanism above described, and when such blade has been swung to the desired angularity it may be there secured by seating the latch 59 in one of the notches 6|. The bucket 69 may also and in like manner be positioned angularly to the line of travel of the tractor, but the usual operation of the bucket for excavating purposes will be with the bucket positioned straight ahead of the tractor.

When the bucket has been filled with earth as a result of its being forced thereinto by the tractor, elevating jack T8 is operated, thus raising the bucket to the top of the track 42a, whereupon the swinging mechanism is operated, causing the bucket-upright assembly to roll around the track 2| to one side .or the other, according to the way in which the swinging mechanism is operated, to the position indicated at Fig. 2, whereupon jack is actuated to force track 42a to the inclined position indicated at Fig. 2, whereupon catch 69 is released by the mechanism above described and the bucket drops to the position shown at Fig. 2 and dumps the contents to the side of and at a distance from the apparatus. This is the method in which this apparatus will be most commonly employed in the construction of ditches and canals, wherein the bucket will be forced straight ahead, excavating the dirt from the bottom of the canal and depositing the same to the side of the apparatus and thus forming the bank of the canal.

I have illustrated in the drawing and herein described many details of construction but it will be understood that other equivalent structures may be used in many cases and such equivalents will occur to those skilled in the art, and my patent protection is not to be limited to the details illustrated and described but is to cover and protect, as well, all equivalent or alternative structures within the spirit and scope of the foregoing specification and the appended claims.

I claim:

1. In material handling apparatus for association with a movable vehicle, an attachable curved track closely carried by the vehicle adjacent the ground and extending in surrounding relation to the vehicle, an upstanding framework having its lower end extending below the top of the vehicle and to a point adjacent the ground, vertically arranged track means carried by the framework, means for mounting the framework on the curved track for bodily movement on said curved track, a material handling implement carried by the framework and capable of moving on the framework track means upwardly and downwardly between a position adjacent the lower end of the framework and a position adjacent the top of the framework,

-means for moving the implement on the framework track means between the said positions,

for movement in a straight path upwardly and downwardly on the framework, means including a curved track carried by the vehicle adjacent the ground for moving the framework together with the implement to different positions around and means for moving the framework and track means as a whole with the implement carried thereby. on the curved track so that the implement regardless of its position on the framework may be placed at different positions about the vehicle.

2. In material handling apparatus for association with a movable vehicle, a curved track carried by the vehicle adjacent the ground, an upstanding framework having its lower end extending below the top of the vehicle and to a point adjacent the ground, means for mounting the framework on the track for bodily movement on said track, a material handling implement carried by the framework and capable of moving on the framework upwardly and downwardly between a position adjacent the lower end of the framework and a position adjacent the top of the framework, means for moving the implement on the framework between the said positions, means for moving the framework as a whole with theimplement carried thereby on the curved track so that the implement regardless of its position on the framework may be placed at different positions about the vehicle, and

implement as a unit.

means for raising and lowering the track to tending to a point adjacent the ground, vertically arranged track means on the framework, a material handling implement mounted for movement upwardly and downwardly on the framework track means, and means for bodily moving as a unit the framework and track means together with the implement upwardly and downwardly with respect to the vehicle.

4. In material handling apparatus for association with a movable vehicle, an upstanding framework closely carried by the vehicle and extending to a point adjacent the ground, vertically arranged track means on the framework, a material handling implement mounted for movement upwardly and downwardly on the framework track means, means for bodily moving as a unit the framework and track means together with the implement upwardly and downwardly with the vehicle, and means for bodily moving as a unit the curved track and. framework together with the implement upwardly and downwardly with respect to the vehicle.

6. In a material handling apparatus for association with a movable vehicle, an upstanding framework carried by the vehicle and extending to a point adjacent the ground, a material handling implement, track means on the framework for the implement, means for pivotally mounting the upper portion of the track means on the framework for outward swinging movement relative to the framework, means for raising and lowering the implement on the track means, means for swinging the upper portion of the track means outwardly and return. and means for raising and lowering the framework, track means and the 7. In a material handling apparatus for association with a movable vehicle, an upstanding framework carried by the vehicle and extending to a point adjacent the ground, a material handling implement, track means on the framework for the implement, means for pivotally mounting the upper portion of the track means on the framework for outward swinging movement relative to the framework, means for raising and lowering the implement on the track means, means for swinging the upper portion of the track means outwardly and return, means for swinging the whole framework and the implement as a unit in a curved path around at least a portion of the vehicle body, and means for raising and lowering the framework, track means and the implement as a unit.

8. In material handling apparatus for association with a movable vehicle, an upstanding framework carried by the vehicle and extending to a point adjacent the ground, a support structure carried by the vehicle and having a part adjacent the framework at a point intermediate its ends, a material handling implement mounted for movement upwardly and downwardly on the framework, means for moving the implement on the framework, means for moving the framework bodily upwardly and downwardly with respect to no the framework, and a pivoting connection means between the framework and the support structure permitting the framework to have relative movement to the support structure but forming a rigid brace when the framework is in its lower position.

9. In material handling apparatus for association with a vehicle, an upstanding framework, a support structure on the vehicle, means for swingin the framework in a curved path around the vehicle, means for raising and lowering the framework, connecting means between the framework and supporting structure for bracing the upper portion of the framework and including means for permitting the raising and lowering of the framework relative to the support structure I sausage and for its movement in the curved path, a material handling implement mounted for upward and downward movement in a straight path on the framework, and means for moving the implement on the framework.

10. In material handling apparatus for association with a vehicle, an arcuate track around a portion of the lower part of the vehicle, means for mwgi the track upwardly and downwardly about an axis remote from the track, an upstanding framework mounted for movement on the track and with the track when moved about the remote axis, means for moving the framework on the track in any position of the track, a material handling implement mounted for movement upwardly and downwardly on the framework in a straight path, and means for moving the implement on the framework.

11. In material handling apparatus for association with a vehicle, a supporting structure mounted on the vehicle and extending above the vehicle, an upstanding framework extending above the vehicle and to a point adjacent the ground, means for connecting the top portion of the framework to the top of the supporting structure to thereby permit the framework to swing about an axis at the top of the framework, said connection embodying a hinged link connection permitting the framework to have upward and downward movement with respect to the vehicle, means for moving the framework upwardly and downwardly, other means for swinging the framework bodily about the support axis, a material handling implement carried by the framework for movement in a straight path upwardly and downwardly thereon, and means for moving the implement.

12. In material handling apparatus for association with a moving vehicle, a curved track carried by one end of the vehicle and extending around the vehicle adjacent the ground, a framework mounted for movement on the track, a material handling implement for upward and downward movement on the framework, means for moving the implement upwardly and downwardly, means for moving the framework and implement as a unit on the curved track, and other means for raising and lowering the track to thereby raise and lower the framework and implement as a unit, said track being so related to the framework as to form an abutment for directly receiving forces acting on the implement when said implement is in a lower working position on the framework and material is handled by movement of the vehicle.

13. In material handling apparatus for association with a movable vehicle, an upstanding framework carried by the vehicle and including parallel members, track means arranged to be co-extensive with the parallel members, means for pivotally mounting the upper portions of the track means so as to permit such portions to be swung outwardly with respect to the framework members, a material handling implement mounted for movement upwardly and downwardly on the track means, means for moving the implement, and other means for swinging the upper portions of the track means outwardly and return.

14. Earth moving apparatus comprising a tractor, a track carried by and semi-encircling the front of the tractor, a framework mounted upon said track and adapted to be moved therealong circularly around the front of the tractor, an earth moving implement carried by said frame- 1'0 work, means for moving said framework, and therewith said implement, along said track throughoig substantially a semi-circular arc around the front of the tractor, said framework extending upwardly above the tractor and carrying a normally vertical track, means for raising said implement along said vertical track, the upper portion of said vertical track being hinged to the lower portion thereof and adapted to swing on said hinges to an outwardly inclined position, and means for swinging said hinged portion to and 'between its normal vertical and its said outwardly inclined positions.

- 15. Earth moving apparatus comprising a tractor; a. track carried by and semi-encircling the front of the tractor, a framework mounted upon said track and adapted to be moved therealong circularly around the front of the tractor, an earth moving implement carried by said framework, means for moving said framework, and therewith said implement, along said track throughout substantially a semi-circular are around the front of the tractor, said track and framework being adapted, by pivotal mounting of the track on the tractor, to be swung above normal, operative position, said framework extending above the tractor and having its top portion pivotally connected with the tractor concentrically of said track, to permit movement of the framework around the tractor along the track, said top portion being also linked to the tractor adjacent said track-concentric pivot mounting whereby to permit upward swinging of said framework while maintaining said pivotal mounting and movement.

16. In material handling apparatus for association with a. movable vehicle, an attachable curved track mounted on the vehicle, means for lowering and raising the curved track, a material handling implement mounted on the curved track for movement to different positions thereon and also for movement upwardly and downwardly with the track, means for raising and lowering the implement in a straight path relatively to and independently of the curved track, and means for moving the implement to different positions on the curved track.

17. In material handling apparatus for attach ment to a vehicle, a curved track positioned at the front end of the vehicle closely to the vehicle frame and extending from one side of the vehicle around the front end thereof to the other side of the vehicle, means for pivoting the curved. track for movement upwardly and downwardly including arms extending rearwardly from the ends of the curved track on opposite sides of the vehicle and pivoted at their rear ends to the vehicle, means for raising and lowering the curved track about the pivot of the arms, means including a material handling implement for relative movement on the track to different positions, and means for moving the implement, said curved track and implement being so associated with each other that the track will form an abutment for directly receiving forces acting on the implement when material is being handled by movement of the vehicle.

18. In material handling apparatus for attachment to a vehicle, a curved track positioned at the front end of the vehicle closely to the vehicle frame and extending from one side of the vehicle around the front end thereof to the other side of the vehicle, means for pivoting the curved track for movement upwardly and downwardly including arms extending rearwardly from the 11 ends 0! the curved track on opposite sides of the vehicle and pivoted at their rear ends to the vehicle. means for raising and lowering the curved track about the pivot of the arms, means including a material handling implement for relative movement on the track to diflerent positlons, means for moving the implement. and other means for moving the implement in a straight path upwardly and downwardly only relatively to the curved track.

GARALD E. DECKER.

REFERENCES CITED The following references are oi record in the file or this patent:

Number Number UNITED STATES PATENTS v Name Date Mayhew Apr. 18, 1922 Anthony Nov. 10, 1925 Gunning Nov. 16, 1937 Browner Feb. 8, 1938 Royle Apr. 14, 1942 Cochran Oct. 6, 1942 Maxwell ..'Oct. 30, 1945 Mandt Aug. 6, 1946 FOREIGN PATENTS Country Date France July 11, 1932