US1536185A - Tractor planer - Google Patents

Description

May 5, 1925.

F. E. ARNDT TRACTOR P'LANER Filed Aug. 5 1924 5 Sheets-Sheet" 1 May 5, 1925.

F. E. ARNDT TRAGTOR- PLANER Filed Aug. 5, 1924 3 Sheets-Sheet 2 Ma 5, 1925. r 1,536,185

- F. E. ARNDT TRACTOR PLANER Filed Aug. 5, 192 3 Sheets-Sheet 5 Patented lt llay "l2;

FRANKLIN 1E. ARNDT, O15 GALION, OHIO, ASfiIGNOR TO THE GALIUN IRON 'VIURKS db MFG. 60.,015 GALION, OHIU, .l-i. UQRIPORATION UF UHIU.

TRACTOR PLANER.

Application filed August 5,

To all whom it may concern:

Be 1t known that l, FnANKmN E. Ae nn'r,

a citizen of the United States, residing at- Galion. in the county of Crawford and 5 State of Ohio, have invented certain new and useful Improvements in Tractor Planers. of which the following is a specification.

Th s invention relates to road working implements or machines, and particularly to power driven machines for maintaining the road in good condition by scraping, planing or leveling the surface of the road and rolling it.

My inven t on has special reference to those forms of road machines wherein a, maintainer, as it is called, is mounted upon a road roller so that the road is planed, scraped or leveled and rolled at the same time.-

()ne of the objectsof the present invention is to provide a construction of this and the rear rollers so as to secure the full weight of the roller on the scraping blade or maintainer.

A further object is to provide a blade ,supporting means which .is so constructed that the blade supporting means maybe set forward or backward on thetractor frame within certain limits-accordng to the exigencies of any special case, and in this connection to provide means whereby one end of the blade may beset further forward or further rearward than the other end of the blade so that the blade" may be disposed at any desired angle to the line of draft.'.

A still further object is to so mount the blade that it may be bodily raised or lowered to increase or decrease the depth of cut or whereby the blade may he tilted to any desired angle so as to change theangle of cut or scraping angle, or shifted 1aterally in either direction so as to make the blade project out further on oneside of the machine than on the other if desired.

Another object is to provide means whereby one end of-the blade may be raised relative to the other end of the blade, or in othcr words whereby the blade may be laterally tilted.

Still another object is to provide means whereby the blade .will give or yield when 1924. Serial No. 73D 2 f3.

it strikes an impediment liable to break the blade or bring the machine ti" a stop.

A further object is to provide means whereby the bodily raising or lowering of the blade may be controlled from the operators station.

A still further object is to provide a very simple, readily operated and yet rigid construction for supporting the blade from the tractor and which will permitof the vaious adjustments heretofore referred to.

()ther objects have to do with the details of construction and arrangement of parts as will appear more fully hereinafter.

My invention is illustrated in the accompanying drawings, wherein Figure l is a side elevation of a front portion of a tractor showing my improved maintainer applied thereto;

' Figure- 2 is 'a top plan View of the tractor showing the maintainer in plan;

Figure 3 is a section on the line 3 3 of Figure 2;

Figure 4 is a longitudinal sectional View through the housing 27 and the worm gear therein;

Figure '5 is a section on the line 5-5 of Figure 1; i

Figure 6 is a perspective View of thesegment gear and of the knuckle 4O separated therefrom;

Figure 7 ing 25.

Referring to these drawings, it will be seen that .I have illustrated a tractor having a supporting frame or cradle comprising the longitudinally extending beams 10.. These beams converge at their forward ends and extend upward to form a goose'neck. and oscillatably mounted in the forward ends of is a perspective View of the cast these beams, which beams constitute the cradle, is the yoke 11, this yoke carrying the axle of the forward roller 12. The rotation of the forward roller is controlled by any suitable means, not necessary to describe .in the present application. The rear ends of Mounted upon the cradle and between the front and rear rollers is the engine, not illustrated, which will ordinarily be the engine of a Fordson tractor operatively connected to'the rear axle by driving eonnections not necessary to describe, as they form no part of my invention.

So far I have described a more or less specific form of tractor. but it will be understood that this is purely illustrative and that any other desired form of tractor might be used. Mounted upon the beams 10,- which are illustrated as channel beams, are the longitudinally extending guides 18 which, as illustrated, are T-shaped in cross section so as to provide vertically extending flanges and a horizontally extending web projecting'toward the flanged side of the corresponding channel iron 10. One of the vertical flanges is provided with a series of perforations These T-shaped guide beams 18 are operatively supported upon the beams 10 by means of angle irons 19. The guides 18 are riveted or otherwise attached to the angle irons 19.

Also mounted in suitable bearings on the frame of the tractor is a longitudinally extending shaft 20, the forward portion of this shaft not being attached or connected to the tractor. except as hereinafter stated, the rear end of each shaft carrying a beveled gear wheel 21 which is engaged by a beveled gear wheel 22 mounted on a vertical shaft 23 carrying a hand wheel 24. Two of these shafts QO-are mounted one on each side of the machine and twocontrolling shafts 23 are disposed at the operators station. Coacting with each of the guides 18 is a sliding casting which includes a bracket25 having flanges 26 which embrace the upper and lower edges of the flanges on the T-shaped guide beam. This bracket is provided with a lug which is perforated, the perforation being disposed to register with the perforations 18, and a pin is passed through these registering perforations to hold the bracket in adjustedposilion upon the guide 18. The casting is-illustrated in Figures 1 and 7 and includes. the bracket portion 25 before referred to, which carries at its upper end a longitudinally extended housing or hood 2? approximately semi-circular in cross section and closed at the end by the walls 28 and 29, each of these walls being formed to'provide bearings 30 and 31 for engagementby the shaft 20. the shaft 20 passing through these hearings and the housing having a sliding fit upon this shaft.

Extending from the lower portion of the bracket 25 is a cylindrical barrel 3) having a bore within which is disposed a bearing pin or fixed shaft, designated generally 33, this pin having a diameter fitting the barrel tightly so that the pin is non-rotatable therein. The portion of the pin projecting beyond the barrel is slightly larger than the barrel and constitutes a bearing for asector, designated generally 34. This sector is provided with the arcuate gear teeth 35 adapted to be engaged by a worm gear and with a downwardly and rearwardly extending arm 36, said arm being forked. as shown in Figure 6, and the rear extremity of the fork so formed being provided with a transverse opening forthe passage of a pivot pin 37.

Mounted upon the shaft 20 is the worm 38, the point of which engages the sector 34:. This worm is splined upon the shaft 20 for sliding movement with relation thereto and is held between the abutment formed by the rear end wall of the housing 27 and one end of a coiled compression spring 39 which bears against the opposite end wall 29 of the housing, this compression spring being of sutlicient strength to yieldingly hold the worm in its normal position. If, however, the sector gear be shifted in a counter-clockwise direction, the worm 38 will compress the spring 39. As soon as the sector gear has returned to its normal position, however, the spring will urge the worm back to its normal position.

Pivotally mounted within the fork formed at the lower end of the segment arm 36 there is disposed a rea-rwardly extending pin 40 having an upwardly extending arm 41 disposed between the arms of the fork formed at the rear end of the segment. this arm 41 having a perforation at its lower end adapted to register with a plurality of perforations 12 formed in the side walls of the fork. A pin 43 is adapted to be disposed through the perforationsin the walls and through the perforation in the end of the arm 41 to thus hold the arm in its adjusted position. This pin 40 and the arm 41 together constitute a. knuckle, as it may be termed. As shown in Figure 6, the pin -10 is provided with a shoulder 44 and the end of this pin opposite the arm 11 is internally screw-threaded.

Carried upon each of these pins or knuckles is a swiveled bearing comprising a sleeve or barrel 45'fitting the pin 40 and held in place by a cap screw 16 extending .into the screw-threaded bore at the end of the pin. Extending downward from this barrel 45 are depending legs 47 terminating ina circular plate 48. A transverse web 49 just below the barrel 45 is transversely bored. The base is vertically bored and interiorly screw-threaded at '50. this screw-threaded bore extending up to the barrel and through the end wall of the barrel 45. Coacting with the bearing member formed with the barrel l5 and the base 48 is a blade connector,-

designated generally 51, which is formed- 11,536,165 Y i 5T1} a bore 53 passes, this flat upper web fitting against the under face of the base 48, and a screw 54 passing up through the bore 53 and so that this connector is swiveled upon the base 48 and oscillates with relation thereto. This base 50 is formed with the downwardly and outwardly depending jaw and with the upper jaw 56 having the depending flange 57. From the edge of the jaw 55 there extends the downwardly and outwardly curved flange 58. This connector 52 is also formed with thetransversely extending bore 59, through which passes a set screw 60, this set screw passing through the casting and into the space defined by the jaws 55 and 56. llt will, be seen that the connector may oscillate upon its pivot screw 54 to any desired extent. The pin 54 is held by the key 63.

Coacting with the jaws 55 and 56 is the reinforcing angle bar 61having a horizontal flange extending between the flange 57 and the jaw 55 and adapted to be engaged by the set screw 60. This reinforcing angle iron is formed upon its upper flange with the upwardly projecting, longitudinally extending rib 64 which is preferably riveted or other wise attached to the bar itself, this rib 64 being formed withwa plurality of drill holes approximately deep and evenly spaced along the bar with which the point of the set screw 60 is adaptedto engage. There is one of theseedge bars mounted upon the ends of angleiron 61, and mounted upon the angle iron 61 is the scraper blade 65, this scraper blade being provided with screws 66 extending through the vertical flange of the iron 61 and into the scraper blade. Thus the scraper blade, which istbeveled on its upper and lower edges, may be turned over so that when one edge becomes worn the.

other edge may be used. This scraper blade may also be adjusted transversely with reference to the line of draft by releasing the screws 66 and shifting the reinforcing angle iron 61. Of course, it will be understood thatone end of the angle iron 61 is engaged with one of the swiveled supporting members, while theother end of the angle iron 61 is engaged with the other swiveled supporting member, and thus it will be obvious that the blade may be tilted to any desired angle, shifted transversely into any desired rela-- tion to the middle line of draft, and that by shifting the knuckle formed by the pin 40 and the arm 41 the scraper may be tilted to i (so a greater or less degree. Thus the scraper may be held in a plane at right angles to the surface of the road or may be tilted so that it is extended upward and rearward or tilted so that the blade is extended upward and forward. By lifting one of these segments and lowering the other segment, it is obvious that oneend of the bladewill be lifted while theuothe'r end will be depressed, and

that this will be permitted by reason of the sleeve or barrel 45 oscillating upon the pin 41 of the knuckle. The adjustment of the connector upon the pin 54 is held by means of'the set screw 60.

lit will be seen that with this construction the shaft 20 is supported at its rear end in the bearing carried by the rear bracket, while at its forward end the shaft is supported in the two bearings formed on the sliding housing so' that the shaft is amply supported along its entire length and cannotfget out of alignment so as to prevent an easy;.movement of the housing and the sliding brackets on the guides 18.

Tn'the operation of this device, the tractor is, of course, driven under its own power, the tractor being controlled by the usual controlling mechanism disposed at the operators station 14. When it is desired to level, scrape or plane the road, one or both of the shafts 23 is operated to cause the depression of one or both of the segment gears 34 and, I

therefore, the depression of the blade. If

one of the segment gears is depressed more than the other segment gear, it is obvious that the blade will be depressed more at one end than it is at the other. This is secured by the independent action of the two operating shafts 23 and by the fact that there is a swiveled connection between the blade supporting member-and the pin 40 of the knuckle which supports this member. Previous cooperating, the blade is to be set so that it either planes,.in which case the blade is scrapes, in which case the blade is either dis-' posed vertically upward or upward and for-z ward at an inclination. Thisis secured by initially setting one or both of the knuckles .so that the adjusting pins will pass through 7 one or the other of the openings 42, thus hol-dmg the arm 34 in any set position. The

through the-opening in the slide bracket and through the opening in the guide 18 Y and shifting the slide bracket by hand along this guide to the desired position and then fastening it in place by the pin. This adjustment of the blade is permitted by the swivel connectionof the lower portion of i the blade holder to the upper portion around the pin 54. If the blade should strike a rock or other impediment or obstruction 100 disposed to slant downward and forward, or:

which would tend to break the blade or prevent the turtherforward movement of the tractor. the blade will tilt backward upon the pivot pins for the sector gears, this oscillation of the sector gears being yieldingly resisted by means of the springs 39.

It will be seen that this construction provides a combined maintainer and road roller of a very simple yet strong and eti ective character and in which every necessary adjustment of the blade is provided for andin which the roller operates upon the road at the same time that the blade is planing or sc 'aping the road.

, I claim 1. The combination with a supporting vehicle having an operators station and including a longitudinally extending frame, of a groundworking tool carrier including a member mounted on the frame for longitudinal adjustment therealong and pivoted for movement, means for shifting the carrier around its pivot including a coacting gear element, and a fixed actuating means therefor located at the operating station, the gear element being shift-able with the carrier and being at all times in operative engagement with the actuating means. i

2. lhe combination with a supporting vehicle having a longitudinally extending frame, an operators station mounted thereon, longitudinally extending guides moun ed upon the trainc, slides mounted upon said guides and each adjustable longitudinally thereon independently of the other slide, vertically oscillatable members mount-ed one on each of said slides and havingrea'rwardly and downwardly extending arnis. a blade operatively supported upon said arms, and

means disposed at the operators station.

whereby each one of said oscillatable members may be adjusted independently of the other.

3. The combination with a supporting ve hicle having an operator's station and including a hmgitiulinally extending fame, of members slidinglv mounted upon said frame. for independent longitudinal ad justment therealong scraper supporting members oseillatablx mounted upon said sliding members for independent vertical oscillation, a scraper blade carried by said 'members, means disposed at the operators station whereby said oscillatable members may be independently raised or lowered to raise or lower either or both sides of the blade said means acting to hold the blade in adjusted position, and means permitting the rearward and. upward movement of the blade when the blade strikes an impediment.

4. The combination with a supporting vehicle having an operators station, of slides mounted upon the vehicle on each side thereof and independently shittable longitudinally, means for holding the slides in their mamas arm for oscillation in a vertical plane approximately parallel to the line of draft of the vehicle or at right angles thereto and including a member mounted tor oscillation in a horizontal plane to which the blade is directly connected, and manually operable means disposed at the operators station for oscillating said members to thereby raise or lower the arms thereof and the blade connected thereto.

5. The combination with 'a vehicle, ol longitudinally extending guide, bars mounted thereon and perforated atintervals, slides mounted upon the guide bars and independently shittable therealong and held in shift.- ed position by means passing through the perforations in the guide bars, an oscillatably mounted blade, carriers mounted upon the slides, a blade carried by said carriers, and manually operable means for oscillating said blade carriers.

6. lhe combination with a vehicle, of os cillatably'mounted blade carriers mounted upon the vehicle and having rearwardly extending arms, manually operable means for independently oscillating the blade carriers. a pin pivot-ally mounted upon the rear end of each of said arms for movement in a vertical plane, means for holding said pin in adjusted position, a sleeve rotatably mounted upon the pin for oscillation in a )lane transverse to the draft line of the vehicle, a blade, and means operatively sup porting the blade upon the opposite sleeves. T. The combination with a vehicle, of oscillatably mounted blade carriers mounted upon the vehicle and having rearwardly extending arms, manually operable means for independently oscillating the blade carriers, a pin pivotally mounted upon the rear end of each of said arms for movement in a vertical plane, means for holding said pin in adjusted position, a sleeve rotatably mounted upon the pin for oscillation in a plane transverse to the draft line of the vehicle, each of said sleeves having an approximately circular disk, a blade supporting member having at rotational engagement with said disk, a pin extending up through said blade supporting member and the disk and acting as the pivot for the blade supporting member, and a blade carried by said supporting members.

8. The combination with a .vehicle, of oscillatably mounted blade carriers mounted upon the vehicle and having rearvardly extending arms, manually operable means for. independently oscillating the blade carriers, a pin pivotally mounted upon the rear end ltlt) asagna of each of said arms for movement in a vertlcal plane, means for holding said pin in ad usted position, a sleeve rotatably mounted upon the pin foroscillation in a plane transverse to the draft line of the vehicle, each of said sleeves having an approxi- Supporting members, the blade being transversely adjustable.

9. In a mechanismof the character described, a blade carrier having upper and I lower jaws, a blade having a member 'mounted upon its back and extending into said jaws and longitudinally shiftable through the jaws, and means for holding the blade and the member in longitudinally shifted positions.

10. The combination with a vehicle, of a blade carrier including longitudinally extending members mounted on opposite sides of the vehicle and mounted upon the vehicle for independent vertical adjustment, a sleeve surrounding each of said members, a blade support operatively mounted upon each of said sleeves, and a blade operatively engaging at its opposite ends with said blade support whereby either end of the blade may be depressed relative to the other end.

11. The combination wit-h a vehicle, of a blade carrier including longitudinally extending members mounted on opposite sides of the vehicle and mounted upon the vehicle for independent vertical adjustment, a sleeve surrounding each of said members, a blade support operatively mounted upon each of said sleeves including two coacting members mounted for relative oscillation in a horizontal plane, one of said members be ing fixed to the sleeve, and a blade carried at eachend by the other of said members whereby said blade maybe tilted and may be shifted into angular relation to the line of draft;

12(The combination with a tractor, of slides mounted upon the tractor for independent longitudinal movement on opposite sides thereof, an'oscillatable member mounted on each slide, a blade, and means supporting the blade upon the oscillatable members at its opposite ends permitting the oscillatable members to be independently shifted vertically and the blade thereby tilted and permitting one of said slides to beshifted in advance of the, other-of said slides to thereby support the blade in angular relation to the lineof draft.

13. The combination with a tractor, of guides mounted thereon and extending longitudinally and on opposite sides thereof, slides mounted upon the guides, sector gears mounted upon said slides, a worm engaging each sector gear, a longitudinally extending shaft mounted on each side of the tractorhavi-ng sliding engagement with the worm, means for independently operating said shafts, and a blade operatively supported upon and having swiveled engagement with the segment gears.

14-. The combination with a tractor, of guides mounted thereon and extending longitudinally and on opposite sides thereof, slides mounted upon the guides, sector gears mounted upon said slides, a Worm engaging each sector gear, a longitudinally extending shaft mounted on each side of the tractor having sliding engagement with the worm, means for independently operat-' mg said shafts, a spring operatively engaged with said slide at one end and at the ward and upward movement of the blade.

when the blade strikes an impediment.

15. The combination with a tractor, of longitudinally extending guides mounted upon the tractor on each side thereof, independently movable slides mounted upon the guides, an oscillatable member mounted upon each slide for oscillation in a vertical plane, manually operable means for independently oscillating said members, and a blade operatively comiected to said members adjacent its opposite ends for oscillation in a vertical plane transverse to the line of draft and in a horizontal plane.

16. The combination with a tractor, of longitudinally extending guide bars supported upon the tractor on opposite sides thereof, sliding brackets mounted upon said guide bars, means for holding the brackets adjusted upon the guide bars, longitudinally extending shafts mounted, one in .connection with each guide bar, means whereby said shafts may be independently manually operated, a worm --slidably mounted upon each shaft, a housing forming part of the bracket extending" over said worm, a spring surrounding the shaft and fitting at one end against the forward end of the housing and at'the other end bearing against said worm and resisting its forward movement, a sector gear operatively mounted upon each bracket and engaging said worm thereof and having a rearwardly and downwardly directed arm, and a scraper blade operatively connected to each of said arms, the springs permitting the scraper blade to. move upward and rearward when the blade strikes an impediment. 17. in an apparatus of the character described, scraper supporting means includinging tool carrier operatively supported for an upper jaw having a' downwardly extending, forward, marginal flange, a jaw extending downward and forward and having a flange extending downward and forward therefrom, a scraper blade, an angular reinforcing iron attached to the scraper blade and having a horizontal flange extending rearward and disposed between the upper jaw and the lower jaw and having upwardly extending bars attached to the margin of the flange engagingbehind'the upper jaw, the lower flange on the lower jaw engaging against the lower edge of the reinforcing angle iron, and set screws passing through the depending jaw and operatively engaging" the angle iron to prevent accidental longitudinal movement but permit longitudinal adjustment.

18. The combination with a vehicle including a frame. of a support'for a groundworking tool, thesupport being pivotally mounted upon the frame, and means for adjusting the support on its pivot, said adjusting means yielding in one direction upon an impact in one direction on the groundworking tool.

19. The combination with a tractor, of a ground-working tool carrier pivotally mounted upon the frame for oscillation in a vertical plane, a coacting gear element operatively supported upon the frame for longitudinal movement relative thereto, and a spring normally yieldingly holding the gear element against longitudinal movement but yielding to permit shifting of the gear element when the ground-working tool carrier is shifted in one direction.

20. The combination with a tractor hav ing a supporting frame, of a ground working tool carrier pivotally mounted upon the frame for oscillation in a vertical plane, an operating shaft. a gear mounted upon the shaft and rotating therewith and engaging the carrier to oscillate the same, and yielding means normally holding the gear against longitudinal movement along the shaft .in one direction but yielding to permit said longitudinal movement when the free end of the carrier is shifted in one direction.

21. The combination with a vehicle ha"- ing a supporting frame. of a ground-working tool carrier operatively pivoted upon the frame for oscillation in a vertical plane. the tool carrier having a sector gear, a longitudinally extending shaft disposed above the carrier, a wormmounted upon said shaft for rotation therewith, a stop preventing rearward movement of the worm, and a spring permitting forward sliding movement of the worm when the lower end of the tool carrieris moved rearward under impact.

pivotal movement in a vertical'plane, a coacting gear element operatively supported by the frame and adapted to oscillate the gear clement, said gear elelnent being yieldingly held in a normal position but being longitudinally shiftable in one direction upon a rearward movement of the free end of the tool carrier.

23. lhe combination with a vehicle having a longitudinally extending frame, of a slide operatively supported upon the frame for longitudinal adjustment, a groundworking tool carrier pivotally mounted upon the slide for oscillation in a vertical plane and adjustable longitudinally of the frame with the slide, means for oscillating the carrier including a gear elcm'cnt movable by and with the shifting of the slide, and an actuating element including a shaft with which the gear element has sliding engagement.

24. The combination with a vehicle having a longitudinally extending frame, of a slide operatively supported upon the frame for longitudinal adjustment, a groundworking tool carrier pivotally mounted upon the slide for oscillation in a vertical plane, means for operating the tool carrier including a gear element operatively engaging the carrier, a shaft upon which the gear element is mounted for unitary rotation therewith, the gear element being slidable upon the shaft, and a housing within which the gear element is disposed and with which itslides, said housingbeing operatively engaged with the slide for longitudinal movement therewith.

25. The combination with a vehicle having a longitudinally extending frame, of a slide operatively supported upon the frame for longitudinal adjustment, a ground working tool carrier pivotally mounted upon the slide for oscillation in a vertical plane, means for operating the tool carrier including a gear element operatively engaging the carrier, a shaft upon which the gear element is mounted for unitary rotation therewith, the gear element being slidable upon the shaft, and a housing within which the gear element is disposed and with which it slides, said housing being operatively engaged with the slide for longitudinal movement therewith. said housing being extended forward and then having a wall through -which the shaft passes, and a spring dis posed to surround that portion of the shaft within the extension of the housing and operatively bearing against said gear and permitting the gear to be shifted longitudinally independently of the housing and shaft and against the action of'said spring.

26. The combinatiouwith a tractor having a longitudinally extending frame, of ground-engaging tool carriers operatively pivoted uponopposite sides of the frame for 27. The combination with a tractor 'hav ing-a longitudinally extending frame, of a blade, blade carriers operatively pivoted upon the frame for oscillation in -a vertical plane and independently shiftable with re lation to each other, said blade carriers being independently longitudinally shiftable upon the frame, and means for independently raising and lowering the blade carriers including a gearing element for each bladecarrier movable with the blade carrier, and separate actuating means for each gear element and at all times in engagement there with and toward or from which the gear elements are movable.

28. The combiniation with a tractor having a supporting frameincluding longitudinallyextending beams, slides mounted up on the beams for movement therealong, means for holding said slides in adjusted positions, blade carriers each pivotally mounted vupon a slide for oscillation in a vertical plane, means carried at the free endsof the *blade carriers for supporting a blade below the tractor, means for oscillating the blade carriers including a gear element associated therewith, and independent actuating means for each gear element and engagingthegearelement in all positions thereof, the. gear element being movable .with and by the slides as the slides are adjusted. i I

29. The combination with a tractor hav ing a supporting frame including'longitudinally extending beams, slides mounted upon the beams for movement therealong, lneans for holding said slides in adjusted positions, blade carriers each pivotally mounted upon 'a slide for oscillation in a vertical plane,

means carried at the free ends of the blade carriers for supporting a blade below the tractor, means for oscillating the blade carriers including a gear element associated therewith, independent a'ctuating means for each gear element and engaging the gear element in all positions thereof, each of said carriers being formed with a sector gear, a longitudinally extending shaft mounted above the beams upon which the slides are mounted, wormgears slidably mounted one on each shaft but rotating with their respective shafts and engaging said sector gears, and a housing extending upward from each slide and operatively engaging the ends of the worm gear to thereby cause the movement of the worm gear along its shaft when the corresponding slide is moved along its beam. 7

In testimony whereof I aliix 'my signature.

FRANKLIN E. ARNDT. 1

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