US2031695A - Machine for tamping earth - Google Patents

Description

Feb., 25, E936. J. EGGERT MACHINE FOR TAMPING EARTH Filled July 5, 1932 2 sheets-sheet .1

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Feb. 25, 1936. 1 EGGERT LQS MACHINE FOR TAMPING EARTH Filed July 5, 1952 2 Shee'tS-Sheet 2 Patented Feb. 2,5, 1936 PATENT OFFICE MACHINE FOR TAMPING EARTH Joseph Eggert, Columbus, Ohio; Emma L. Keny admmistratrix of said Joseph Eggert, deceased Application July 5, 1932, Serial No. 620,806

18 Claims.

My invention relates to a machine for tamping earth. It has to do particularly with a machine for tamping earth under a side form such as is commonly used in the construction of concrete highways, although it is not necessarily limited to use in this field of operation.

In the prior art, other tamping machines have been devised but, in many cases, these tamping machines are of a cumbersome nature and considerable difficulty is involved in the operation of such apparatuses and in the placing of them in position for operation. Some of these other tamping machines are used in the tamping of dirt under railroad ties, wherein the required conditions of operation are considerably different.

One of the objects of my invention is to provide a. tamping machine of the type indicated which is so constructed that it can be placed upon a concrete sideform or removed therefrom with facility by one man.

Another object of my invention is to provide a machine of the type in question which may be moved along the side form automatically during its operation but which may also be moved along the side form either forwardly or rearwardly like a wheel-barrow without danger of accidental displacement from the side form.

Another` object of this invention is to provide a transporting wheel which is normally maintained in inoperative position during the tamping operation but which is so disposed that it can be rendered effective for supporting the device in its travel along the form with a minimum of difficulty.

Another object of my invention is to provide a simple and effective means for oiling the side form for the purpose of preventing the sticking of the concrete thereto.

My invention preferably embodies a carriage provided with a pair of flanged traction rollers which are designed to travel along the top of the side form and to prevent accidental displacement therefrom. These traction rollers are preferably driven by an internal combustion engine and are effective to propel the carriage along the concrete form without manual assistance. The device further preferably embodies a tamping member on each side of the concrete form and these tamping members reciprocate in downwardly converging paths, this reciprocation being effected by a driving connection from the internal combustion engine,

My device further comprises a transporting wheel which is adjustable to diierent positions and which is designed to roll idly along the top of the concrete form during the tamping operation In this position, the transporting roller may be made immediately effective by lifting the rear end of the machine through the medium ,of

a handle structure provided for this purpose. In one position of adjustment, the transporting roller is designed to ride upon the ground, so that the machine may be moved from place to place like a wheel-barrow.

My apparatus also comprises an oil tank with a delivery conduit leading therefrom. In conjunction with this, I have provided a conduit leading from the exhaust of the engine and the oil conduit hasits outlet disposed within the conduit which leads from the exhaust so that the exhaust gases pick up the oil and carry it in vapor form. These exhaust gases are then delivered to the concrete form so that the oil carried thereby is deposited on the form. 1,5

There are various other features of my invention. These features will be explained more in detail as this description progresses.

The preferred embodiment of my invention is shown in the accompanying drawings wherein similar characters of reference designate corresponding parts and wherein:

Figure 1 is a perspective view of a concrete form with my machine mounted thereon.

Figure 2 is a rear elevation of my machine 25 mounted on the concrete form, many of the parts being removed so as to more clearly show the arrangement of the tamping units and the driving mechanism therefor as well as the manner in which the oil-laden exhaust gases are applied to 30.

the form.

Figure 3 is a detail, in side elevation, of the front end of my apparatus showing the transporting wheel in two of its positions of adjustment.

Figure 4 is a plan view of the structure shown in Figure 3.

Figure 5 is a more or less diagrammatic View of my apparatus in the position of the parts when the apparatus is being transported with the transporting wheel on the ground.

Figure 6 is a diagrammatic side elevation of my apparatus showing how it is initially positioned on the side form so that the transporting wheel can be adjusted to the desired position.

Figure 7 is a diagrammatic side elevation of my apparatus with the parts shown in the position which they assume during the tamping operation.

Figure 8 is a diagrammatic side elevation of my apparatus with the parts in the position which they assume when the apparatus is being transported along the side form.

In the drawings, a concrete side form is shown at A. It may take various forms but, as shown, it is provided with a horizontal base plate having a narrow upstanding iiange on one edge and a wide upstanding flange on the other edge. This wide upstanding flange is inwardly and then downwardly bent in the usual form of rail construction, as illustrated in Figure 2.

My apparatus preferably comprises a carriage which may be generally designated I and which is provided with vertically extending flanges 2 and 3 which serve as bearings for the support of shafts 4 and 5, one at either end of the carriage. These shafts are preferably mounted for vertical adjustment on the carriage by means of bearing members 5 and l, this vertical adjustment being effected through the medium of bolts which may be placed in any one of the series of bolt holes 8 and 9. This structure facilitates the proper location of the tamping units, to be described, regardless of the height of the concrete side form upon which my apparatus is operating. VThe manner in which this is effected will be more apparent with the further description of this machine.

Keyed to the shafts 4 and 5 are flanged rollers respectively designated I0 and II. Each roller embodies two spaced annular flanges and the depth of the flanges is such that they will serve to prevent lateral displacement of the front end of the machine from the top of the side form, even when this machine is being manually propelled or pulled along and upon the side form with the major portion of its weight supported by the transporting wheel riding upon the side form.

Secured to the sides of the flanged rollers are sprockets I2 and I3, so that the rotation of one shaft and the roller carried thereby will be effective to rotate the other shaft and the roller carried thereby through the medium of a sprocket chain I4. The shaft 5 is provided at one end with a large sprocket gear I5 which is driven from a small sprocket I 6 through the medium of a sprocket chain I'I. The small sprocket I6 is keyed upon a shaft I8 to which is also keyed a large sprocket gear i9 which is driven by a sprocket chain 2G from a sprocket gear (not shown) carried upon a transverse shaft 2|. 'Ihe transverse shaft 2| is driven in any suitable manner from the internal combustion engine 22'.

-As illustrated best in Figure 2, the shaft 2| extends between the vertically disposed channel members 22 and 23 which are supported by the body portion of the carriage in any suitable manner. This shaft projects, at both ends, bevond the outer sides of the channel members 22 and 23 and has disks 24 and 25 keyed thereon.

l Eccentrically mounted on these disks are crank pins 25 and 2l to which are connected reciprocating means for actuating the tamper units. Since these tamper units and their operating mechanisms are identical, the descriptionv of one will f suflice'.

As shown in Figure l, the crank pin 21 fits rotatably within a knuckle 28 and this knuckle 28 is provided with a bore extending at right angles to the crank pin, so that it may readily align with the perforated ears 29 and 30 of a fork member 3|. A pin 32 extends through these aligning openings to produce a universal joint structure for the connection of the upper end of a pitman rod construction to the crank pin 2'I.

The pitman rod construction further comprises a bolt 33 which extends upwardly through the base of the fork 3| and has a rectangular head 34 disposed within said fork. The lower end of this bolt extends through the base of an inverted fork 35 and is likewise provided with a rectangular head 35. The fork 3| and the fork 35 are each provided with collars 3'I and 38 respectively which may be formed integrally thereon and which are embraced by the extremities of a coil spring 39 which also surrounds the bolt 33.

The legs of the fork member 35 are pivotally connected to a sleeve 40 of a universal joint connection similar to'that which connects the upper end of the pitman rod to the crank pin 26. This universal joint connection is effective to connect the lower end of the pitman rod to an upstanding lug 4| of a lever 42 which is fulcrumed as at 43 and which has its outer end pivoted as at 44 to a tamping unit 45. The tamping unit 45 is maintained in converging relation to the base of the side form A by means of a guide member 46 within which it is reciprocable.

It will be seen from this that the tamping unit is mounted for reciprocation towards and from the dirt beneath the edge of the side form and at such an angle as to adequately pack the dirt under this side form. The yielding pitman structure is such that it will compensate for shocks and jars which inevitably occur in varying degrees depending upon the particular substance being operated upon. The universal connections further compensate for irregular resistance to the tamping blows. With the tamping units on both sides of the device, they effect a balancing action which, together with other structural features of the device, enable my apparatus to travel automatically along the side form and effect a tamping operation during travel in a highly satisfactory manner without danger of accidental displacement from the form.

In order to preclude the sticking of the concrete or any portion thereof to the side form, it is desirable to apply oil thereto. I have provided a simple and highly effective means for automatically applying oil to the side form as the tamping operation progresses.

The means for effecting this oiling operation preferably comprises a source of oil supply in the form Of a tank 4'I which is carried upon my carriage, preferably in a comparatively elevated position. This tank 4'I is provided with outlets in its bottom, preferably adjacent either end thereof and leading into conduits 48 and 49 which are respectively provided with controlling valves 50 and 5I. These conduits 48 and 49 extend downwardly into converging relation with opposite sides of the upstanding wall of the side form and are open at their lower ends. It is desirable that they be, approximately, quarter inch pipes with their lower ends open.

The lower ends of these pipes extend into elbow nozzles 52 and 53 (Figure 1) and may be concentrically disposed within such nozzles. They preferably terminate a short distance within the nozzle outlet.

The elbow nozzles 52 and 53 are mounted upon conduits 54 and 55 which, through the medium of flexible conduits 56 and 51, receive the exhaust gases from the internal combustion engine 22'. The result of this structure is that, when the internal combustion engine is operating and the valves 5!) and 5| of the oil conduit are open, the oil flo-Ws by gravity through the conduits 48 and 49 to the outlets thereof and are met at this point by the exhaust gases of the internal combustion engine, These gases vaporize and pick up this oil in the elbow nozzles and deliver these oil-laden gases onto th'e side form. The result of this action is to deliver the oil in vaporized form and more or less under pressure onto both sides and the top of the side form, as will be apparent from the showing of Figure 2. Furthermore, the heat from the exhaust gases thins the oil so that it more readily vaporizes. This pressure application insures application of the oil over a substantial area of the side form. Thus, all of the surface area of the side forms with which the concrete is liable to contact andv to which it might otherwise adhere is fully oiledv to preclude such adherence.

My apparatus is further provided with meansv whereby it may be transported either upon the ground or upon the side form like a wheel-barrow. Thus, at its rear, there is provided a bifurcated handle 60 which is preferably horizontally disposed but which is provided at its innermost end with a downwardly inclined portion 6I that flts in a socket member 62 rigidly mounted upon the carriage structure. The socket member 62 is split on one side and a handle 62 is provided so that the socket member 62 may be caused to grip the handle 60 or may be adjusted to permit the handle 66 to swing in the socket. The handle 60 may be swung in its socket from a substantially horizontal position, as shown by full lines in Figure 1, to a substantially vertical position as shown by the dotted lines. This adjustment of the handle 60 is for a purpose which will be hereinafter apparent. The handle 62 may operate any suitable means (not shown) for causing the socket member 62 to grip the handle 60 or to allow it to freely swing therein.

At its forward end, the carriage is provided with a transporting wheel 63 that is journaled upon a transversely extending portion 64 of a U-shaped member 65. The U-shaped member 65 has a transversely extending portion 66 at its rear, as shown in Figure 4, and this portion 66 is pvotally disposed in parallel plates 61 and 68, which plates project forwardly from the front end of my carriage structure.

Intermediate the parallel plates 61 and 68, the transverse portion 66 carries a collar 69 which is preferably secured thereto by a set screwV and disposed adjacent the inner surface of the member 61. This transverse portion 66 also carries a compression spring 16 in surrounding relation thereto and lying between the inner surface of the plate 68 and the collar 69. The portion 66 is of such a length that it will be capable of a substantial axial movement within its bearings and its outermost extremity is provided with a pin 'H to limit axial movement in one direction.

The forward end of the plate 68 is provided with a keeper member 'l2 in the form of a laterally extending flange whose outer edge is downwardly and outwardly inclined (Figure A1). This keeper-member is of such form and so located that it will cooperate with the U-shaped member 65 to permit movement of the forward end of said U-shaped member downwardly to place the transporting wheel 63 on the ground. During this downward movement, as for example from the position shown in Figure 1 to the position shown in Figure 3, the portion 66 of the U-shaped member will move axially against the pressure of the coil spring l', as indicated in Figure 4, until the U-shaped member 65 passes below the point of the keeper-member 12. At this time, the compression spring 'iG will reverse-the axial movement of the portion 66 and cause the latching of the U-shaped member 65 below the keeper 12.

The collar 69 which is carried by the portion 66 of the U-shaped member 65 is further provided with an integral upstanding extension 13 which is more or less Lshaped and which is provided at its extremity, as shown in Figure 3, with an adjustable set screw M Inspection of Figure 3 and Figures 5, 6 and '7 will show that this member 'I3 assumes several different positions during the 1 ation.

adjustment of the transporting wheel 63 to theseveral positions which it may occupy, as will be explained during the description of the operation of my device.

My apparatus is further provided, as shown in Figures 2, 3V and' 4 with a depending: pin 16 which is supported from the bed plate ofv the carriage of my machine by nuts 16. This pin is particularly useful in the placing of my transporting wheelon the side form in the position shown in Figure 1, being used to temporarily support the forward end of the machine upon the side form so as to relieve the U-shaped member 65 and the transporting wheel 63 from the weight of any portion of the machine during its adjustment from the fullv line position of Figure 3V to the dotted line position thereof, as will more clearly appear from the description of the operation.

In operation, my apparatus may be transported to the side form upon which it is to be mounted as shown in Figure 5, wherein the major portion of the weight of the machine is carried by the transporting wheel 63 and the device is trundled like a wheel-barrow. Inl placing the device upon the side form, the supporting wheel 63 is positioned immediately adjacent the side of the side form and the rear roller Il is so positioned that its flanges embrace the top of the form. Then the forward end of the machine is swung into such position that the lower end of the pin 15 rests upon the top of the side form and inwardly along the inclined edge of the machine thereon.

In this position, the transporting wheel 63 is relieved of all weight of the machine and the operator may then grasp the U-shaped member 65 and move it to the dotted line lposition of Figure 4. This transporting wheel may then be lifted and moved to the position shown in Figure '7, these lifting and lateral movements being facilitated by the action of the spring 10 which tends to cause the member 65 to ride upwardly and inwardly along the inclined edge of the keeper 12`.

In this position of the transporting wheel, the front end of the machine may be readily moved laterally to complete the movement of the pin 15 across the top of the side form and into the position in which it is shown in Figure 2. This movement permits the front roller l0 of the machine to drop down so that its flanges embrace the top of the side form. Then, the apparatus will be in the position shown in Figure '1, in which position the transporting wheel 63 may ride idly upon the top of the side form. When the machine is so positioned on the side form the handle 60 is swung to a substantially vertical position, as shown by the dotted lines in Figures 1 and 7, and is secured in such position by operation of handle 62.

By starting the internal combustion engine by the pedal lever shown in Figure 1 or by any other suitable apparatus and by manipulating the clutch mechanism (not sho-wn), the rollers l0 and Il will be positively driven and the tamper mechanism will be set in operation. The device is so balanced that it will ride securely upon the side form and will be propelled along the same by means of the rollers while the tamping mechanism simultaneously performs the tamping oper- Furthermore, the operator may Walk directly behind the machine and keep it in balanced position on the form by means of the vertically extending handle 60. Either one or both of the valves 50 and 5I may be open and this will result in the automatic application of the oil-laden exhaust gases to the side form.

During the operation of a machine of this type, it is frequently necessary or desirable to transport the machine rearwardly or forwardly along the side form while the tamping mechanism and the oiling mechanism is inoperative. This is one of the reasons that it is desirable to have the transporting wheel riding idly along the top of the form during the tamping operation of the machine, though another reason is the desirability of maintaining this transporting wheel in such a position that a proper balancing of the machine upon the side form during the tamping operation will be facilitated.

When the occasion arises for transporting my machine along the top of the form, as indicated, it is merely necessary for the operator to lower the handle 60 to substantially longitudinal position and to lift the rear end of the machine to the position shown in Figure 8. In this position, the entire weight of the front of` the machine is carried upon the transporting wheel 63 which is riding upon the top of the form. However, it should be noted that the flanges of the roller I0 are still in embracing relation to the top of the form. Thus, though the roller I0 does not actually run upon the form in this position of adjustment, it does serve to guide the front end of the machine along the form and prevent the transporting roller and the front end of the machine from running off the form.

It should also be noted that, in the position of adjustment shown in Figure 8, the set screw 14 bears upon the bed plate of the machine and nally transmits the weight from the U-shaped member 65 to the body of the machine. It should also be noted that, due to the adjustability of the set screw 14, the height to which the handle 60 must be lifted to bring about contact of this set screw 14 with the bed plate and to therefore transfer the weight of the machine to the transporting wheel may be varied. This adjustment is useful in accommodating the height of these handles to the height of the operator, since it is apparent that a short man may more readily transport the machine with the handle 60 at a lower height than would be the case if the operator were a tall man.

In the removal of the machine from the side form, it is merely necessary for the operator to press down on the outer end of the handle 60 to lift the forward end of the machine to such a position that the lower end of pin 15 will occupy a position upon the upper edge of the side form A, similar to the position shown in Figure 6. The forward end of the machine is then swung laterally until the pin occupies a position at the opposite side of the side form. This causes the transporting wheel @3 to be moved laterally olif the side form. The weight of the transporting wheel will then cause it to fall downwardly to a position where the member 65 will be moved beneath the keeper l2. In this position, the lifting of the handle 6i! will cause this keeper 12 to abut the U-shaped member 55 and form a rigid contact so that the machine may then be rolled away from the side form like a wheel barrow.

It will be seen from this that I have provided an extremely simple type of tamping machine wherein all of the parts are balanced in such a way that the machine may travel along the top of a side form without danger of overturning. In the rst place, the traction rollers with their wide flanges eifectually guide the machine and the ability to position the transporting wheel on the top of the side form with its weight supported thereon in line with the center of gravity of the machine minimizes the danger oi tilting. This danger is further decreased by the use of tamping members operating in converging planes.

It will also be apparent that the oiling mechanism which I have provided permits of the. provision of an oil delivery pipe of suiicient size to practically eliminate all danger of clogging of the delivery port or of the pipe due to foreign matter which may accidentally get into these pipes. On the other hand, the use of the exhaust gases for vaporizing the oil insures that the particles of oil applied will be suiiiciently small and suiliciently spread out to produce ample lubrication, especially in view of the fact that these gases effect the application of the oil to the form under pressure and heat the oil, causing it to become thin and to readily vaporize.

It will likewise be obvious that the feature of my machine which permits the placing of the front end of the machine on the top of the side form in such a manner as to relieve the transporting wheel from vdownward pressure greatly facilitates the movement of this transporting Wheel from its position along side the side form to the top of the side form, since the release of the U-shaped member 65 from the keeper l2 would otherwise be extremely diicult.

Various other features of importance have been previously explained during the description of this apparatus.

Having thus described my invention, what I claim is:

l. A machine for tamping earth along and under a concrete side form comprising a carriage designed to ride upon said side form, a tamping unit, and means for oiling said side form embodying a means for vaporizing the oil.

2. A machine for tamping earth along and under a concrete side form comprising a carriage designed to ride upon said side form, a tamping unit, and means for oiling said side form embodying ameans for intermingling the oil with hot gases and using the hot gases as a vehicle for applying the oil to the side form.

3. A machine for tamping earth along and under a concrete side form comprising a carriage, a tamping unit, a iiuid operated engine for driving said tamping unit, a source of oil supply, and means for conducting the exhaust gases from said engine into contact with oil from said source of oil vsupply and thence into contact with said side forms.

4. A machine for tamping earth along and under a concrete side form comprising a carriage, a tamping unit, a iiuid operated engine for driving said tamping unit, a source of oil supply, means for delivering the exhaust gases from said engine into contact with said side forms, and means for conducting oil from said source of oil supply into the path of such exhaust gases during their travel towards said side form.

5. A machine for tamping earth along and under a concrete side form comprising a carriage, a tamping unit, a uid operated engine for driving said tamping unit, a source of oil supply, means for delivering the exhaust gases from said engine into contact with said side forms, and a pipe leading from said source of oil supply and having a delivery opening in the path of said exhaust gases.

6. A machine. for tamping earth along and under a concrete side form comprising a carriage,

Lil

a tamping unit,l means for vdelivering oil to the side form comprising a source of oil supply, means for subjecting the oil to hot gases prior to application thereof 'to said side form, said hot gases being adapted to thin and vaporize said oil.

'7. A machine for delivering oil to a side form comprising a source of oil supply, and means for conveying the oil to said side form by means of a current of hot gases.

8. A machine for tamping earth along and under a concrete side form comprising a carriage, a tamping unit, a transporting Wheel, means for adjusting said transporting wheel, and means for adjustably limiting the uppermost position of said wheel.

9. A machine for tamping earth along a concrete side form comprising a carriage, fianged rollers for embracing the top of said side form and a transporting wheel adapted to ride on the top of said side form, the flanges of one of said rollers being of such depth that the roller may be lifted from said side form to transfer the weight of the machine to said transporting wheel while still retaining such iianges in a position to prevent lateral displacement of the machine.

10. A machine for tamping earth along a concrete side form comprising a carriage, vertically adjustable flanged rollers for embracing the top of said side form, and an adjustable transporting wheel normally adapted to ride on the top of said side form, the flanges of one of said rollers being of such depth that the roller may be lifted from said side form to transfer the weight of the machine to said transporting Wheel while still retaining such anges in a position to prevent displacement of the machine.

1l. A machine for tamping earth along and under a concrete side form comprising a carriage, a tamping unit, a transporting Wheel, means for adjusting said transporting Wheel, and a member on said carriage adjustable to a position with relation to said side form lto support the weight of the machine and to relieve said transporting Wheel of the Weight of said machine.

12. A machine for tamping earth along a concrete side form comprising a carriage, a transporting wheel movable into and out of operative position, a traction means for effecting movement of said carriage along said side form, a member on one end of said carriage adapted to be positioned on said side form to support the weight of said machine, means for delivering oil to both sides of said side form, and a handle structure connected to said carriage and movable to one position for transportation of said machine and to another position for guiding and balancing said machine on said side form,

13. A machine for tamping earth along and under a side form comprising a carriage, a tamping unit, a transporting wheel normally adapted to ride on said side form in inoperative position, said transporting wheel and said carriage being adjustable relative to each other so that the Weight of the machine may be shifted to said transporting wheel on said side form, and means for preventing lateral displacement of said carriage when said transporting Wheel is in inoperative position or when it supports the Weight of said machine.

14. A machine for tamping earth along and under a side form comprising a carriage, a tamping unit, a transporting Wheel normally adapted to ride on said side form in inoperative position, said transporting wheel and said carriage being adjustable relative to each other, means for limiting the uppermost position of said transporting Wheel so that it will support the weight of said machine on said side form, and means for preventing lateral displacement of said carriage When said transporting Wheel is in inoperative position or when it supports the weight of said machine.

15. A tamping machine comprising a self-propelled carriage constructed to alone travel and alone maintain its balance upon a single side form, driven tamping means on said carriage for continuously tamping earth along and under the side form While the carriage continuously advances along said side form, and means for oiling said side form and embodying a means for intermingling the oil with hot gases and using the hot gases as a vehicle for applying the oil to the side form.

16. A machine for tamping comprising a carriage constructed to ride directly upon and along a member under which material is'to be tamped, a tamping means automatically operated to strike successive tamping blows as said carriage travels along and upon said member, and means for oiling said member as the cai'- riage travels therealong and embodying a means for intermingling the oil with hot gases and using the hot gases as a vehicle for applying the oil to said member.

17. A machine for tamping comprising a carriage constructed to ride directly upon and along a member under which material is to be tamped,

a tamping means automatically operated to strike successive tamping blows as said carriage travels along and upon said member, a transporting wheel normally adapted to ride on said member in inoperative position as the carriage moves therealong, said transporting wheel and said carriage being adjustable relative to each other so that the weight of the machine may be shifted to said transporting wheel on said side form and means for preventing lateral displacement of said carriage when said transporting Wheel is in inoperative position or when it supports the Weight of said machine. ,l

18. A machine for tamping comprising a carriage constructed to ride directly upon and along a member under which material is to be tamped, a tamping means automatically operated to strike successive tamping blows as said carriage travels along and uponsaid member, traction means operating upon the member along which said carriage rides to propel said carriage along said member during the tamping operation, said traction means embodying positively driven flanged rollers adapted to operate on said member, a transporting Wheel independent of said traction members and normally adapted to ride on said member in inoperative position as the machine moves therealong, said transporting Wheel and said carriage being adjustable relative to each other, means for limiting the uppermost position of said transporting wheel so that it Will support the weight of said machine on said member, the forward flanged roller being of such a type that even when the transporting Wheel is in its uppermost position it will still cooperate with said member to guide said carriage there along.

JOSEPH EGGERT.

CERTIFICATE OF CORRECTION.

Patent No. 2,051,695. February 25, 1936.

JOSEPH EGGERT.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, second column, line 52, strike out the words "inwardly along the inclined edge" and insert instead supports the weight of the front end; and that the said Letters Patent should be read with this correction therein that the same may'oonform to the record of the case in the Patent Office.

Signed and sealed this 14th day of April, A. D. 1936.

(Seal) Acting Commissioner of Patents.

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