US1793066A

US1793066A - Hydraulic road scraper

Info

Publication number: US1793066A
Application number: US421794A
Authority: US
Inventors: George E Dean
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-01-18
Filing date: 1930-01-18
Publication date: 1931-02-17
Anticipated expiration: 1948-02-17

Description

I Feb. 17, 1931. E, DEAN HYDRAULIC ROAD 5 CRAPER Filed Jan. 18, 1930 5 Sheets-Sheet 1 Feb. 17, 1931. G. E DEAN HYDRAULI C ROAD SCRAPER Filed Jan. 18, 1930 5 Sheets-Sheet 2 Geor 011. can

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HYDRAULI C ROAD 5 CRAPER Filed Jan. 18, 1930 5 Sheets-Sheet 5 \noenfox" Gems E. Dean M QIIQrm-gS-D Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE GEORGE E. DEAN, on GRAND RAPIDS, MICHIGAN, AssIoNoR TO CHARLES G. WILLETT, F GRAND RAPIDS, MICHIGAN HYDRAULICRQAD SCRAPER This invention relates to road scrapers of the type which are now used on and below trucks on roads for the purpose of scraping the road to level or smooth the same or for removing snow or the like from the road in the winter time.

In road scrapers of this type it has been common to mount the scraper blade on a rock shaft which in turn has been carried on suitable hangers from an upper supporting beam and the beam is mounted with reference to the truck chassis frame so that it can be shifted to different angles to the longitudinal axis of the frame or may be reversed in position so as to scrape to the same side-of the road in either direction of movement of the truck. It has further been common to operate the rock shaft by a hydraulic operated piston so as to raise or lower the scraper blade: lifting it into inoperative position when it is not to be used and forced downwardly against the road surface when it is used.

The present invention has as one of its primary objects and purposes the provision of a novel hydraulic means for operating the scraper blade rock shaft to raise andlower the scraper and for providing a construction capable of heavy duty and by means of which the strains which the scraper must resist are transmitted in a more uniform manner' in the length of the supporting beam which 'carries the rock shaft. More specifically a circular member is secured to the supporting beam concentric with the axis about which the beam is turned in shifting or changing its angle, and the hydraulic power apparatus is mounted between this circular member and the beam and connected with the rock shaft whereby the stresses set up are carried by 40 the circular member to the beam at points distant from its pivotal axis. A further object and purpose of the invention is to provide hydraulic apparatus for changing the angle or reversing the position of the scraper carrying beam selectively at any time when desired through the operator in the cab of the truck starting themechanism in motion for accomplishing such result.

- A still further object of the invention is to provide a novel hydraulic power means the apparatus for moving the scraper blade to different anglesor for reversing its position. Many other objects and purposes than those stated together with novel constructions for attaining the same will be apparent .upon understanding of the invention from the following description, taken in connection with the accompanying drawings, in which,

Fig. 1 is a side elevation of a truck having my invention applied thereto.

Fig. 2 is a perspective diagrammatic view illustrating essential elements in combination present in my invention for operating the scraper blade rock shaft and for turning the scraper supporting beam to different angles.

Fig. 3 is a plan view, with some parts in section, illustrative of the mechanism which is mounted on and beneath the truck and showing the hydraulic apparatus for raising and lowering the scraper. blade and for changing it to different angular positions across the road.

Fig. 4 is a fragmentary longitudinal vertical section through the construction shown in Fig. 3 and illustrating its mounting on the truck.

Fig. 5 is a fragmentary rear elevation of the scraper mechanism illustrating particularly the manner in which the scraper blade is secured to the rock shaft, this being one of the valuable features of the invention. 7

Fig.--6 is a plan, with one of the valve housings in section, showing. the power ch is mounted in the 1 section and side elea intal section substantially w .ne 88 of Fig. 7, and

transverse vertical section a e rock shaft and scraper blade jliwing the manner in which the connecting spring members between said rock shaft and M scraper blade are detachably secured to the rock shaft.

Like reference characters refer to like parts in the different figures of the drawings. The truck 1, shown in Fig. 1, is of any conventional constuction. Usually for road maintenance work it carries a dumping body which is hydraulically operated to dump its contents as has been common on trucks for many years. The truck has the usual spaced apart side chassis frame members 2 from which the scraping apparatus is supported. In practice spaced apart front and rear vertical slotted bars 3 are connected to the side frame members 2 of the truck and may be vertically adjusted to different positions. Between the lower ends of the vertical supporting bars 3 at each side of the truck, two parallel bars 4 are positioned and secured attheir ends to the lower ends of the bars 3. An elongated inverted channel beam 5, which is used to carry the rock shaft and the scraper blade connected therewith, lies directly underneath and across the two pairs of bars 4, one at each side of the truck, and U-shaped elongated hangers 6 made of fiat metal are attached at their ends to the upper side of the beam and extend over the bars 4 as best shown in scraper carried thereby from the bars 4 but permitting a wide range of angular movement of the beam and scraper. This 'construction is one which has been used and is not new herein being fully illustratedand described in my application Ser. No. 394,408, filed September 23, 1929, and in my 'Patent No. 1,765,969, granted June 24, 1930.

At the underside of the beam 5 and, as will hereafter appear, concentric with the vertical axis about which the beam swings in its angular movements, is a ring 7 of metal which enters into notches cut into downwardly extending flanges of the channel beam 5 and permanently secured to the beam pref Fig. 5, thereby supporting the beam and the erablv by welding. A plurality of hanger the spring arms lie against the rear side (if the scraper blade 10 and the blade is detachably secured thereto b means of clips 12, bolts passing through t e blade and the clips as shown in Fig. 4. The upper ends of the legs of the U are formed into spring coils 13 from which, at each outer end, terminal parts 14 of the spring arms extend and are detachably connected to the rock shaft. As shown in Fig. 9 a block 15 is shaped at its front side to lie against the rear side of the rock shaft and between the block 15 and a second block 16 the ends 14 of the spring arms are clamped, bolts 17 passing through both of the blocks and through the rock shaft to securely clamp the end portions 14 of the spring arms against movement.

It is apparent with this construction that should aspring arm between the rock shaft and the scraper blade break at any time it is very quickly and easily removed and a. new

one put in its place. Releasing the bolts 17 i used with two of the blocks 16 which serve to clamp the ends 14 of any spring arm member to the rock shaft serves to release said spring arm member and then by removing the clip 12 associated with such spring mem ber it can be entirely removed and a new one attached in its place.

Between the front. side of the beam 5 and at the front portion of the ring 7 two spaced apart plates 18 are permanently secured, (see Fig. 3) between which a cylinder 19 is located having oppositely disposed trunnions 20 which pass through and have a rotatable mounting in the plates 18. A piston rod 21 extends through the rear head of the cylinder 19. Two clamps 22, as best shown in Fig. 4, are clamped upon the rock shaft 9 and from the upper clamp 22 vertical ears 23 extend between which the rear end of the piston rod 21 is received and has a pivotal connection thereto as shown in Fig. 2. It is evident accordingly that on rearward movement of the piston rod 21 the rock shaft 9 will be turned to face the scraper blade 10 against the road surface and upon forward movement of the piston rod 21 the rock shaft member turns to elevate the scraper blades A red 24 of metal preferably having flattened upper and lower sides is located transversely of the rear ends of the bars 4 at the lower ends of the vertical bars 3, as shown in Fig. 4, and is securely clamped in place by means of clamps 25 engaging against the un-' derside of the rod 24 and clamping it against the lower ends 26 of the rear bars 3. Two spaced apart horizontal under plates 27 are located atthe underside of the bar 24 and extend forwardly therefrom under the lower edgeofthe ring7 (see Fig. 3). An upper plate 28 lies at its rear edge portion above the bar 24 and extends forward therefrom over the ring7. The-

plates

27 and 28 are permanently secured to the bars 24 by means of bolts indicated at 29. The plate 28 in front of the ring 7 is offset upwardly and continued in a forward direction over the upper side of the beam 5 and at its front end has a circular opening therein into which a dished member 30 extends (see Fig. 4) which is bolted to the beam 5, the outwardly extending flanges of the member 30 passing over the upperside of the plate 28 around the opening.

This secures the beam 5 against movement except about a vertical axis through the center of the circular member 30 the plate 28 serving as a support to hold the beam against aimless movement. Between the upper plate 28 and one of the lower plates 27 as shown in F ig.- 3, a drum 31 having projecting teeth is mounted together with a gear 32 below it on a common vertical shaft 33 which has bearing at its ends in the plates 27 and-28. Between the plate 28 and the lower plate 27 at the other side of the structure a roller indicated at 34 is mounted which bears against the ring 7, the drum 31 also bearing against said ring. The ring 7 isformed with a plurality of spaced apart openings 35 adapted to receive the gear teeth on the drum 31 so that when the drum is turned the ring 37 will also be turned and change the angular position of the beam 5.

A piston rod 36 having rack teeth formed in one side thereof meshes with the gear 32 and enters through a head at one end of a second cylinder 37 which is located between and permanently secured to the upper plate 28 and one of the lower plates 27 as shown in Fig. 3. The piston rack rod 36 is held in engagement with the gear or pinion 32 and will not disengage therefrom through a bracket 38 as shown in Fig. 3. Movement of the piston rod 36 causes a turning movement of the ring 7 about a vertical axis passing through the member 30 with a consequent shifting of the beam 5 about such axis so that it and the.

and 42, respectively, which lead from thepumping mechanism, located in the cab, underneath the chassis of the motor truck, being supportedby clips 40a attached to the underside of the cross member of a motor truck frame as shown in Figs. 4 and 5.

Other pipes

43 and 44 lead-to the outer and inner ends re spectively of the hydraulic cylinder 37, it of course being understood that the

piston rods

21 and 36 extend from pistons Within the cylinders as is common and usual in .inder h draulic apparatus.

In tll e cab of the truck and preferably mounted back of the dash is a receptacle or tank 45 for containing the reserve supply of hydraulic liquid used, usually oil. An electric motor 46 is mounted on and above the tank 45 and its shaft, extending into the tank at its lower end, is equipped with a pinion47, driving a gear 48 which inturn drives the pumping mechanism housed within a pump housing 49 supported near the bottom of the tank 45 by a vertical bar support 50 as shown.

- When the pump is in operation it forces oil or other suitable liquid through an outlet pipe 51 which extends through and above the top of the tank 45 and is directed rearwardly to connect with a union 52 (see Fig. 2). The union 52 has a vertical pipe connection 53 therewith which, through suitable unions and nipples, joins with one side of a valve housing 54 in which a valve 55 is mounted to be operated by a handle. The pipe 44 previously described leads into one side of the valve housing and at the diametrically opposed side is a connection 56 with which the companion pipe 43 joins.

From the remaining side of the housing 54 a pipe 57 leads to a union 58 from which the return pipe 59 for the oil to the tank extends forwardly and downwardly as best shown in Fig. 2. A

piston cyl- To the other end of the union 52 a pipe 60 is connected which leads to and connects with one side of a second valve housing 61 housing a valve 62 which at its directly opposite side has a connection with the union 58. The pipe 42 previously described leads 'to the valve housing 61 and diametrically opposite a connecting pipe 63 joints with the pipe 41.

The motor is operated in substantially the. same manner as the starting motor on an automobile by pressing a suitable switch indicated at 64 in Fig. 1 with the heel. This drives the gear pump and with the valves at 55 and 62 open the oil will return through the

pipes

57 and 60 to the return pipe 59. With the valve 55 at the position shown in Fig. 6 the oil will be pumped through pipe 44 to the inner end of the cylinder 37 and will thereupon move the ring 7 in one direction .and

change the angular position of the beam 5 and the scraper carried by it. If the valve at 55 is turned to another position at right angles to that shown in Fig. 6 the oil will be pumped through the pipe 43 to the outer end of the cylinder 37 with a consequent movement of the ring 7, beam 5 and scraper blade 10.0pposite to that when the oil is pumped to the front end of the cylinder 37.

It will be noted with reference to Fig. 6

that when the oil is being pumped outwardly through the pipe 44 to the inner end of the cylinder 37 the oil between the piston in said cylinderand the outer end of the cylinderis tions at right angles to each other like what has been described with reference to valve 55,

oil may be pumped through either end of the cylinder 19 to thereby effect the raising or lowering of the scraper blade.

The construction described has proved very practical in actual road tests. With it any desired pressure of the scraper blade against the road within the limits of the weight and traction of the truck may be attained and the raising and lowering of the scraper blade very quickly and easily accomplished. In like manner the angular adjustment of the scraper blade to different positions or to reversed positions with respect to.

the positions previously had may be quickly and simply secured. The invention is defined in the appendedclaims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

1. In combination, a beam, a ring secured to the beam and extending both front and back thereof, a rock shaft, brackets supporting the same, a scraper blade, connections from the rock shaft to the scraper blade, a fluid pressure cylinder located at one side of the beam, means between the beam and the ring on which said cylinder is mounted, a

piston rod projecting from the cylinder and connections between the piston rod and rock shaft for rocking the shaft on movement of the piston rod.

2. A construction of the class'described' comprising, spaced apart horizontal supports, a beam mounted transversely of said supports for angular change of position on Y the supports, ascraper with pivotal support therefor carried by the beam, a member secured to said beam and extending to one side thereof, a fluid pressure cylinder, means for mounting said cylinder between a side of the beam and said member and means for actuating said scraper by said hydraulic cylinder.

3. In a construction of the class described, a horizontal beam, a scraper mounted lengthwise of and under said beam for pivotal movement thereon, an open continuous member connected to said beam and extending both front and back thereof, a fluid power cylinder, means for mounting said'cylinder between a side of the beam and a side of said open member, a piston and piston rod asso ciated with said cylinder, and 3*0011118Cl31011 between the piston rod and the pivotal mounting for said scraper for moving said scraper on introduction of a pressure fluid into said cylinder at either end thereof.

4. A scraper structure comprising, an adjustable beam, a curved member attached to said beam and extending to one side thereof, a scraper structure carried by the beam, a fluid pressure cylinder, and means interposed between said cylinder and said curved member and engaging with said curved member.

5. A scraper structure comprising, a truck frame, spaced apart horizontal supports carried on and below the frame, a horizontal beam mounted on and carried by the supports for adjustment to different angular po sitions, a curved member connected to said beam, a fluid pressure cylinder, piston rod associated therewith, and gearing connections between said piston rod and the curved member for adjusting said beam to different angular positions on longitudinal movement of the piston rod.

6. A scraper structure comprising, a support, a horizontal beam pivotally mounted between its ends thereon to turn about a vertical axis, a curved member connected to said beam and extending to one side thereof, a fluid pressure cylinder, a piston and piston rod associated therewith, said piston rod bemg formed with a rack, a gear engaging with said curved member, and means for turning said gear on longitudinal movement of the piston rod.

7. A scraper structure comprising, spaced apart horizontal supports, a horizontal beam mounted transversely :of and on said supports for angular adjustment, a scraper carried bv the beam, a horizontal bar spaced from said beam, a plate secured to the bar extending to an intermediate portion of said beam, means pivotally connecting said plate to the beam whereby the beam is adjustable about a vertical axis, a fluid pressure cylinder, a piston and piston rod associated therewith, a curved member secured to the beam and extending from the beam to adjacent the piston rod, and operative connections between said piston rod and curved member for turning the beam and scraper about said pivotal axis of adjustmeint on longitudinal movement of the piston ro 8. In a construction of the class described,-

and scraper for raising or lowering the scraper on movement of said piston rod.

9. A scraper structure comprising, a horizontal beam mounted for pivotal movement about a vertical axis located between the ends of the beam, a member attached to said beam at its ends at spaced apart points and spaced from the beam at its intermediate portion, spaced apart plates located between the intermediate portion of said member and the beam and connected thereto at their ends, a fluid pressure cylinder pivotally mounted to turn about a horizontal axis on said plates, a rock shaft carried by the beam, a scraper blade carried by the rock shaft, a piston rod extending from the cylinder toward said rock shaft, and a connection between the piston rod and rock shaft for rocking said rock shaft to raise or lower the scraper blade on movement of the piston rod.

10. In a scraper structure, a horizontal beam mounted for adjustment about a vertical axis to difl'erent angular positions, a scraper blade pivotally mounted on said beam for raising and lowering, fluid pressure power means connected with said scraper blade for selectively raising or lowering the same, a second fluid pressure power means connected with said beam for selectively moving the beam and scraper blade to different angular positions, a fluid pressure pump, connections between the sameand both of said fluid pressure means for carrying the pressure fluid to each of said means, and selective control devices for controlling. the direction of flow of said pressure fluid through said connections.

11. In a scraper structure, a horizontal beam mounted for adjustment about a vertical axis to different angular positions, a scraper blade carried by said beam, a curved member secured at its ends to the beam at points equidistant from said vertical axis, said curved member having a plurality of consecutive openings therein, a gear having teeth engaging in said openings, power operated means for turning the gear, and selective means for effecting the turning of said gear by the power operated means in either direction.

12. In a construction of the class described, a horizontal su porting beam, a rock shaft mounted on the eam, a scraper blade carried by the rock shaft, a. circular ring member connected to the beam, means for pivotally mounting the beamto turn about a vertical axis coincident with the center of said ring member, fluid pressure power means located at one side of the beam between it and said ring member and connected with the rock shaft to rock the same, a second fluid pressure means located at the opposite side of the beam and adjacent the opposite portion of said ring member, and means engaging the said opposite portion of the ring member and actuated by said second fluid pressure means for turning the ring member and attached beam about said vertical axis.

13. A construction containing the elements in combination defined in claim 2, combined with a fluid pump, a reservoir for fluid in which the pump is located, means for operating the pump, conduits extending to opposite ends of each of said fluid pressure means, and valve control means for selectively directing pumped fluid through either of the conduits leading to each of said fluid pressure means.

In testimony whereof I aflix my signature.

GEORGE E. DEAN.