US1473003A - Scarifier - Google Patents

Description

Nov. 6, 1923. 1,473,003

' E. E. BERRY SCARIFIER Filed Dec. 1, 1920 4 Sheets-Sheet 1 E. EKBERRY SCARIFIER 1. 1920 4 Sheets-Sheet 2 iled Dec,

/yro 52v! 5.296

Nov. ,6 19

E. E. BERRY Nov. 6 1923.

SGARIFIEH 4 Sheets-S1eet 5 Filed Dec 1, 1920 fczrl E. 561* 1,473,003 E. E. BERRY SCARIFIER Filed Dec. 1. 1920 4 Sheets-sheaf. 4

Patented Nov. 6, 1923.

warren srr' emcee 551%.." l

ARL E- BE Y r KENNE amar EN i e e AS I NQR AME AN ROAD MACHINERY COMPANY, ne or KENNETT SQUARE, rnNns YLv nrA, A conm ri OF DEL WAR SCARIFI-ER.

Application filed December 1, .1920. .Serial No. 427,494.

To aZZ whomz't may concern:

Be it known that I, EARL E. BERRY, a

citizen of the United States, residing at, Kennett Square, county of Chester, and r 6 State of Pennsylvania, have invented anew and useful Improvement in Scarifiers, of

which the following. is a full, clear, and exact description, reference being hadto the accompanying drawings, which form a part .of this specification.

This invention ,relates to an improvement in fluid pressure actuating .scarifiers, and more particularly to devices of this type which are attached to road machinery or steam-rollers for tearing up the surface of roads prior .to paving.

The object of my invention isto provide a simple and efiicient device of this character in which the teeth of the scarifier are rotated about the axis of their support to raise the points of the teeth above theplane of the supporting wheels of the scarifier, when out of operation, and thereby reduce the required movement of the scarifier when shifting it from its operative position to its inoperative position, andat the Sametime provide sufficient clearance between the points of the teeth and the ,road when the scarifier is in its raisedorinoperative posi- 80 tion.

Another object of.my inv,enti0n is to so mount the cylinder for raising and lowering the scarifier, from its operative to itsinoperative ,position orvice versa,.that I. am enabledto :form a direct connection between the, operating piston in the cylinder and the scarifier by means of the piston rod, and toso mount thescarifierthat the teeth will be automatically positioned by the direct action of the piston red when raisingthe scarifier.

A further object of my invention is to provide means whereby the angle .ofthe teeth can readily be changed to vary the pitch ofthe teeth in accordance with the surface tobe scarified. v

The precise nature of my invention will behest understood by reference to;the accompanying drawings, which will now .be described, it being premised,;however, that various changes may be made in;the,details ofv construction withoutv departing from the spirit and scope. of myinvention as. defined in the appended claims.

as Fig.1 of the drawings is arear viewof a in its inoperative position.

portion of a road .roller withone formof scarifier made in accordance withsmy invention attached thereto. v

Fig. 2 is a sectional view on the line of F l. l i

Fig. 3is a detail sectional view on the line 3 3 of F ig. Fig. 4L- is a similar view with thefscarifier Fig. 5 is a detailsectional View on the line 5,5 of device.

Fig. 6 is a detail sectional ,view on the .line 6-6 of Fig. 1, showing a filler .block in position to varythe angle .ofthe'lteeth." Fig. 7 is a sectionallview through ,one form of valve forcontrolling the admission of pressure fluidto the cylindenand thelexhaust therefrom. i'

In the drawings, the reference character '10 designates the rear of asteam roller or road .machine, which :is supported pale usual manner on wheels wliich are driven by power to move the machine overtlie road, and 10 the drivers entrance at the mats shown in Fig. 1. -11 are brackets secured to the frame 12 ofthe roller. l3 is'a shaft mounted therein (and T which extends beyond the-brackets as shown inFig. 1.

'Mounted on the ends of v the shaft vl3 are draw for draglbar's' 14, the outer ends of which are 'bored out'to lrecei've trunnions 15 on the endsof atool bar 16, a nd 17 are scarifying teeth or toolssec'uredfto'th'e.tool bar, by' means of screv'v" clamps 18. teethor tools aresquare incross-section and are pointed at both ends fso as ,to permit Fig. 4, illustratingthe locking reversinggwhen one of'tlie pointsis broken offer blunted. The tool bar 16 ,aiid tlie clamps are provided with.V;shapTed recesses which together form sockets fforlthe Yteth. As the depthiof these .V'-shaped recessesfis less than one-half'jhe greatest'diameter of the teeth, the teeth can be securely clamped in their adjustedpositions by, the 'clanips ;l8.

19 is afiuid pressurejcylinder, havingian upper cylinder head "20,..provided ,witha bearing for a shaft 21,.whichis mounted in brackets 22 secured to.thefframeof.the roller, the arrangement being .such'lthat the cylinder 19 is suspended from. the roller in such a manner that it-can freely oscillate with relation thereto. I

The lowerendof th cylinder isalsoprovidedwith a head 23,..and24 isapis'ton stuffing box on-the cylinder head 23, and.

which rod is pivotally connected at its lower end to the tool bar 16 by a pinn26'h The axis of the pin 26 is eccentric to the trunnions 15 to permit the tool bar to be swungabout the axis of the trunnions 15 by the movement of the piston2et, as hereinafter set forth.

Pivotally mounted on the trunnions 15 are wheels27 which support the toolbar 16 when in operative position, and the depth to which the teeth enter the ground when the scaritier is moved ahead by the roller.

28 and 29 are stops on the drag-bars 1%, which are engaged by stops 30on'the tool bar 16, the stops 28 being arranged to limit the movementof thetoolbar 16 about the axis of the trunnions 15 to determineihe angle of the'teeth 17 as shown in In 3, while the stops 29are arranged to limit the movement of the tool bar in the other direction or folding movement as shown in Fig. 4.

If it is desired to increase the pitch of the teeth 17 from that shown in Figs. 2 and 3, a liner or filler block such as shown at 30*, in Fig. 6, maybe secured to each of the stops 30 to reduce their movement toward stops 28.

Slidably mounted in the piston rod 25 is a locking pin 31 which is retained in its locking position by means ofa spring 32, and is arranged to retain the scarilier in its inoperative position, as shown in Figs. 4 and 5. 33 is a releasing plunger for the locking pin, having a piston 34 in a cylinder 35, in the upper cylinder head 20.

36 is the casing for the controlling valve 37 for controlling theadmission and exhaust of actuating fluid to and from the cylinder- 19, and 88 is an actuating lever connected to the valve 37. I i 39 is a pipe leading from anysuitablc source of fluid pressure to the valve casing 36, and 10 and 41 are pipes leading from the valve casing to the top and bottom, respectively, of the cylinder 19. 4:2 is an exhaust port in the valve casing 35 which communicates with a chamber a3 in the valve casing and which is open to atmosphere by means of a port 44;. 415 is a needle valve for ad justing the size of the outletfrom exhaust port 42 to the chamber 13 to control the speed of the piston in either direction when pressure is admitted thereto.

The pipe 40 is not connected directly with the cylinder 19, but is in direct connection with the small cylinder 35 of the piston 34 on the locking pin releasing plunger 33, and when plunger 33-is advanced to release the locking pin 31, as hereinafter set forth, the piston 34 will uncover a port 46 and admit pressure to the cylinder 19 above the piston 24.

4t? is a cam surface in the cylinder head 20 which is engagedby the locking pin 31 during the upward movement of the. piston 24: to shift the pin against the action of its spring 32, and 48 are stops on the frame of-the roller 10 engaged by the drag bars 1 1 to limit the upward movement of piston 24.

Assuming the parts to be in the position shown in Figs. 4' and 5, and it is desired to lower the scarifiers into operative position as shown in Figs. 1, 2 and 3, the valve 37 is shifted to admit pressure to pipe 10 and place pipe 41 in communication with exhaust port as. i r i g The pressure in pipe 40 will lirst advance the lock releasing plunger 33 and release locking pin 31, which will unlock the piston "2 1. In this releasing movement of the plunger 33, the piston 34 thereon will uncover port 46, admit pressure to the top'of the cylinder 19, and as the'lower end of the cylinder is open to exhaust, the piston 24: will move downward As the exhaust is throttled by means of the needle valve 45,

the movement of the piston will be resisted by the back pressure of the fluid in the cylinder 19 below the piston 2 1 to prevent shock to the various parts when the limit of the movement of the piston 24 is reached.

The piston 241 is moved downwardly until the wheels 27 contact with the surface of the road, and the teeth 17 will enter the ground and be moved downwardly about the axis of the trunnions 15 by the forward movementof the roller 10, until the stops 3() on the tool bar engage the stops 28 on the drag bars 1 1, and the scarifier will be held in its operative position by the pressure of the fluidon the top of piston 24.

VVhen it is desired to raise the scarifier from its operative position, the valve 37 is reversed to admit pressure to the bottom of the cylinder 19 through pipe ail and open the top of the cylinder to exhaust through pipe 10. During the first part of the upward movement of the piston 2%, the teeth 17 will be withdrawn from the ground and the tool bar 16 will be rocked about the axis of the trunnions 15 until the stops 30 engage the stops 29, and during the further movement of the piston 24, the scarifier will be raised to the position shown in Figs. 4 and Just before the piston 24 reaches the limit of its upward movement, the locking pin 31 will engage the cam surface 47 which will move said pin against the action of its spring 32, and as soon as this pin passes the cam surface, the spring 32 will shoot the locking pin 31 into a locking recess above the cam sur-- face 17, as shown in Fig; 5, to retainthe its lockingrecess will also shift the releasing plunger 33, so that its piston 34 will cover port 46. V a

" The advantages of my invention result from the provision of a scarifier having its teeth so mounted that theycan be rotated about the axis of their support so as to be moved away from the road when the scarifier is raised to its inoperative position, which enables me to reduce the height of the lift of the scarifier, and at the same time provide sufiicient space or clearance between the teeth and the road bed when the scarifier is raised to its inoperative position. This reduction in the height of the lift enables me to ,use a single actuating cylinder at the axis of the supporting or gage wheels and the axis of the drag bars is transmitted directly to the piston in the cylinder through the medium of the piston rod, without the interposition of actuating devices between the connecting rod and scarifier, which are liable to become bent and jam, which would destroy the resilient or cushioning action of the piston, when the scarifier engages obstructions. Inother words, the cylinder is so positioned that the line of movement of the piston is coincident with the line of movement of the scarifier, and the teeth can be raised by an obstruction without raising the gage wheels, and as the cylinder is short I am also enabled to directly mount it in a vertical position on the supporting frame of the roller, which is su'fliciently rigid to resist the strains caused by the scarifier.

The teeth are also so disposed with relation to the surface of the ground to be torn up when the scarifier is lowered into operative position, that they will readily enter the ground by the movement of roller and readily assume their working positions, as the movement of the roller will tend to force them into the ground. 7

A still further advantage results from the provision of means whereby the angle or pitch of the teeth can readily be varied to meet the requirements of diiierent surfaces to be scarified.

Having now fully described my invention, what I claim and desire to protect by Letters Patent is 1. A device of the character described having drag bars, both pivoted at one end to permit the outer ends to be raised and lowered, gage wheels connected to the drag bars beyond the pivotal'connections of said bars, a Scarifying tool pivoted to the drag bars beyond their pivotal connections,-a power cylinder, a piston'in said cylinder, a piston rod connected to theqpiston and the tool,the arrangement being such that when the piston is actuated the drag bars are swung about their pivotal connections and the tool is moved about its pivotal :conn ections tothe drag bars, and stops fornlimitlng V the movement of the tool on the drag bars.

2. The combination with a road-machine and scarifier drag-bars pivotally connected thereto and extending longitudinally with reference to theline of travel of the ma' chine, of a transversely extending scarifying tool holding bar pivotally connected to the drag bars, gage wheels mounted on the tool bar, a fluid pressure cylinder mounted onthe road machine, a piston in said cylinder, and a piston rod connected to the piston and the tool bar, the pivotal connection between the tool bar and the connectingrod beingyeccen- V tric to the pivotal connection between the drag bars. and the tool-holding bar.

3. The combination with a road machine and scarifier drag bars'pivotally connected thereto and extendinglongitudinally with reference to the line of travel of the machine, of a transversely extending scarifying tool holding bar pivotally connected to theon theroadmachin a piston in aid cylinder, and a piston rod connected to the piston and the tool bar, the pivotal connection be tween the tool bar and the connecting rod being eccentric to the pivotal connection between the drag bars and the'tool holding bar. 7

4. The combination with a road machine and scarifier drag bars pivotally connected thereto and extending longitudinally with reference to th line of travel of the machine, of a transversely extending scarifying tool holding bar pivotally connected to the drag bars, stops on the, drag bars and the tool bar for limiting the rotary move ment of the tool bar with relation to the dra bars, means for securing liners to one set 0 stops to vary the limit of such movement, gage wheels mounted on the tool bar, a fluid pressure cylinder mounted on the road machine, a piston in said cylinder, and a piston rod connected to the piston and the tool bar, the pivotal connection between the tool bar and the connecting rod being eccentric to the pivoted connection between the drag bars and the tool holding bar.

5. The combination with a road machine and scarifier drag bars pivotally connected thereto and extending longitudinally with reference to the line of travel or" the machine, of a. transversely extendlng scarifying tool holding bar pivotally connected to the drag bars, gage wheels mounted on the tool bar, the axis of said wheels beingin lin with the axis of the pivotal connection between the drag bars and the tool bar, a fluid pressure cylinder Inountedon the road machine, a piston in said cylinder, and a piston rod connected to the piston and the tool bar, the pivotal connection between the tool bar and the connecting rod being eccentric to thepivotal connection between the drag bars and the tool holding bar.

6. A scarifier having longitudinally extending drag bars pivotally connected to a road roller, a transversely extendingscaritying tool holder pivot-ally connected to. the drag bars, gage wheels pivotally mounted on the pivotal connections. between the drag bars and the tool holder. a fluid pressure cylinder, a. piston in said cylinder,

a piston rod connected to the piston, and a connection between the piston rod and the tool holder eccentric to the pivotal connecsure cylinder, a piston in said cylinder, and

a piston rod connected to the piston at one end and pivotally connected at its other end to the tool bar eccentric to the pivotal connection between the drag bars and the tool holder. 7

8. A scarifier having longitudinally ex tending drag bars pivotally connected at their front ends to the rear of a road roller, a

transversely extending tool holding bar piv otally connected to the rear ends of the drag bars, gage wheels for the tool holding bar, and fluid pressure means for raising and lowering the tool holding bar pivotally con lowering the tool holding bar.

9. A machine of the type described, havnected to thetool holding bar between the ends of the drag barsa'nd' arranged to oscillate the tool holding bar with relation to the drag bars when raising an ing pivoted drag bars extending longitu'dinally with relation to the machine, ascarifying' tool bar extending transversely and pivotally connected to the free ends of the drag bars, scarifying tools on the bar, gage wheels for regulating'the depth the tools enter'the ground, and means for raising the tool bar, said raising means being connect-ed tothe tool bar eccentric to the pivotal connectlons between the tool bar and the drag bars to permit the tools to swing about the axis of the tool bar during the raising and lowering of the tool bar.

' In testimony of which invention, I have hereunto set my hand, atKennett Square,

Pa, on this 22nd day of November, 1920.

EARL E. BERRY.

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