US1966936A

US1966936A - Road scraper

Info

Publication number: US1966936A
Application number: US677575A
Authority: US
Inventors: Eugene L Schermerhorn
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-06-26
Filing date: 1933-06-26
Publication date: 1934-07-17
Anticipated expiration: 1951-07-17

Description

y 7, 1934. E. L. SCHERMERHORN 1,966,935

ROAD SCRAPER Filed June 26, 1933 2 Sheets-Sheet 1 July 17, 1934. E; L. SCHERMERHORN 1,966,936

ROAD SCRAPER Filed June 26, 1933 2 Sheets-Sheet 2 Patented July 17, 1934 UNITED STATES PATENT OFFHIE 9 Claims.

This invention relates generally to scraping mechanism and more particularly to a scraping attachment adapted to be positioned underneath a truck chassis frame.

One objection to present day structures of this case lies in the fact that they utilize a rock shaft, this rock shaft extending substantially the length of the supporting beam, whereas in my novel construction I eliminate this rock shaft with its appurtenant structure. I am able to accomplish this reduction in structure by means of my novel arrangement of parts and such elimination decreases both the original construction cost and the maintenance cost as well as facilitating initial installation and replacement due to the decrease in weight of the device.

Another advantage of my invention resides in the positioning of therubber buffer members, these being readily removable and replaceable.

Another advantage resides in the positioning of the return spring for the blade structure, this spring having its greatest pulling effect and its least leverage arm when the blade mechanism is in its lower position and its greatest leverage arm and least pulling effect when the blade is raised, such giving a substantially uniform effect whereby the piston of the hydraulic mechanism is returned to its initial position with a constant velocity.

Yet another advantage resides in the novel blade construction, such being reinforced by the welded angle members which are located immediately adjacent its rear side. Also, the mold board supporting brackets stiffen the blade structure near its ends.

Another advantage resides in the particular location of the trunnions of the cylinder base together with the conduit passing axially through one of these trunnions.

Other advantages will become apparent as the description proceeds.

In the drawings:

Fig. 1 is a side view of my invention as applied to a truck chassis frame.

Fig. 2 is a plan view of the same.

Fig. 3 is a plan View of one end of the cross beam, part of the hydraulic cylinder and its mounting being shown in section.

Fig. 4 is a side view of the structure shown in Fig. 3.

Fig. 5 is a sectional view taken along the line 5-5 of Fig. 4.

Fig. 6 is a front elevation of the mold board supporting bracket.

and 6, has a recess 33 adapted to receive the Fig. 7 is an enlarged fragmentary cross sectional view of the stuffing box connection leading into the hollow trunnion of the cylinder base.

Similar numerals refer to similar parts throughout the several views.

Referring particularly to Figs. 1 and 2, numeral 10 indicates the truck chassis frame having posts 11 depending therefrom by means of the connections 12, these posts being four in number and adjustably receiving the bearing ends 13 of thearc-shaped bars 14. These areshaped bars are preferably formed of angular members.

The cross beam 15 extends horizontally below the arc-shaped members 14 and clamping plates 9, see Fig. 2, provide for circumferential movement of the beam 15 about the axis 16, a yoke member 17 maintaining the beam from lateral movement. The beam is bent downwardlyjat its center portion to provide clearance thereabove.

A supply pipe 19, adapted to receive pressure fluid from the flexible conduit 18, lies alongside of the beam 15. See Figs. 1, 2, 3 and 4.

As shown in Fig. 2, hydraulic operating mechanism and spring retracting mechanism is located at each end of the beam 15, and as such structures are identical, only one will be described.

Journal members 20, see Figs. 1 and 4, are located to the underside of the beam 15 in spaced relationship to each other and a short shaft 21 extends therethrough, being held from endwise movement by the cotter pins. 22. The mold board supporting bracket, see Fig. 6, has arms 23, terminating in bearing members 24 extending upwardly therefrom, these bearing members being pivotally mounted ,upon the shaft 21. Flanges 25 extend laterally from the mold board supporting bracket and receive the bolts 26 whereby the same is rigidly attached to the angle member 30 and the blade 40. A lug 27, see Figs. 4, 5 and 6, extends from one of the flanges 25 and receives one end of the coiled spring 28. The upper end of this coiled spring 28 is adjustably fastened as at 29 to the arm 31, this arm being fastened as at 32 to the end of the beam.

The mold board supporting bracket, see Figs. 5

head of the bolt 34, the shank of the bolt .34 detachably fitting into the slot 35.

An actuating member 36, having an upwardly extending lever arm 3'7, has a pivotal arm 38 which extends laterally and upwardly as shown in Fig. 1 and which is pivotally mounted as at 39 on the central portion of the shaft 21. See Fig. 4.

The lower part of the actuating member 36 is rounded as shown in Fig. 4 and has an opening 41 extending therethrough, this opening receiving the bolt member 34. A buffer cylindrical member 42, preferably formed with rubber, ex-

tends around theibolt 34 and is received between shaft which is usually present in devices of this.

character. The mold board supporting brackets are freely pivoted upon the shafts 21 and likewise the actuating members 36 are also freely pivoted upon these same shafts. The buffer members 42 are looated'betweenthe actuating members and the depending bracket members and these buffermembers transmitthe down-' ward force'from the'leverarm 3'7 to the blade member 40, the buffer members yielding under excessive pressure or under shocks and impacts to damper out any vibrations due to the blade meeting with an obstruction or the like.

The lever arm 37 is connected to and actuated by the piston 45; such piston-having a yoke 46 at its outer end, this yoke being 'con-" nected at '47 to the upper end of the lever arm 37.

=See Figs. 1 and 3. A cylinder 48 threaded into The base the base 49 receives the piston 45. 49 has trunnions 50, these trunnions 50 being mounted in the

extensions

51 and 52 of the bracket members '53 and 54, respectively. The

bracket members

53 and 54 are respectively provided with'f'a groove 55 and a tongue56 whereby proper alinement may be had between the bearings on the extension-

arms

51 and 52, respectively. Thus'the'trunnions 50 of the cylinder base 49 freely'rotate about their axes.

The trunnion 50, see Fig. 3, has a conduit 5'7 leading axially therefrom, the pressure conduit 19, previously referred to, being connected thereto by means of'the stufling box 58. As is shown in' Fig. 7, a metal washer 59 located between the backing 60'and the outturned flange 61 '01 the conduit 19, permits turning movement betweenthe trunnion 50 and the conduit 19.

A pipe -63 leading from and connected to the conduit- 57 by means of the stuffing box 64, enters the'end of the cylinder 48 at 65 and thus the pressure fluid may flow into the cylinder whereupon the fluid pushes the piston'45 out wardly. This outward movement of the 'piston 45 moves the arm '3Ta'nd the actuating member 36 thus" causing movement about the shaft 21. The buffer-member 42 transmits this pressure to the mold board supporting bracket, which is freely pivoted upon the shaft 21, and thus the blade and its reinforcing structure is forced downwardly to operative position as shown in Fig. 1.

Whenever the pressure is released from the operating fluid, the coiled springs 28 contact and raise the blade from its operative position, and exert pressure in a reverse manner so that the pistons 45 traveling into the cylinders 48 force the hydraulic pressure fluidback through the

conduits

19 and 18. It is to be noted that the springs 28 act upon the scraping blade structure and hence through the buffer members 42, thus giving a dampened and even pressure upon the pistons 45 whereby shocks will be eliminated.

Also, the springs 28 are located at an angle to the vertical whereby the effective lever arms, as shown in Fig. l, are at a minimum when the springs are fully extended and as the blade is lifted'thelength 'of these lever arms. increases in order to compensate for thediminished pulling effect of the springs 28. Thus a substantially.

constant pulling effect is had through the yielding buffer means 42.

As shown in Fig; 3, a' tongue 56 extends. into the recess 55 of the adjacent bracket member and these snugly engage in order to properly mount the trunnions 501 Also, this construction permits the insertion of;an extra bolt passing downwardly therethrough' to mount the same upon the beam 15.

As the scraper blade is raisedfrom the position shown in Fig. 1, the lever arm 37 moves rearwardlyr and also upwardly and thus the trunnions 50 turn slightly in the extension arms .51 and 52 and this is taken care of by the stuffing box constructionshown in Fig. 7, such'permitting circumferential movement between the trunnion 50-and the conduit 19 Without limitingmyself to the particular embodiments of my invention illustrated and explained above, and desiring to protect my invention in the broadest manner legally possible, I What I claim is:"

1. In a road scraping mechanism of the class described, the combination of,.a truckchassis frame having four spaced apart posts mounted .thereon, arc-shaped bars. horizontally mounted upon said posts for vertical movement thereon, a horizontal-beam adjustably mounted on said arc-shaped bars, hydraulic means located on said beam, a scraping blade pivotally mounted on said beam, means interconnecting the hydraulic means and the beam whereby introduction of pressure fluid in the hydraulicmeans will cause actuation thereof andmove the blade with respect to the said beam, said hydraulic means including a cylinder and a cylinder base with trunnions pivotally'mounted on the said beam, one of said trunnions having a passageway axially therein, means for supplying fluid to said passageway and means leading from said passageway to the interior of 1 the cylinder forv the purpose described.

2. In a road scraper having a cross beam, two spaced apart mold board supporting brackets pivotally attached thereto, two actuating members pivoted adjacent said brackets, buffer means between said actuating members and said brackets, a scraping blade fastened to said mold board supporting brackets and means for moving said actuating members.

3. In a device of the classdescribed, a beam,

means for mounting said beam, journal members 1504 loeate'd err-said beam in spaced relation to each other} mold board supporting brackets pivoted for free eperation upon said journals, blade mechanism including two angles welded together and a blade/bolted to said angles attached: to said mold board supporting brackets, and buifer means for exerting pressure upon said blade mechanism for the purpose described.

4. A combination of elements as set forth in claim 3 in which actuating members operate said bufiers, said actuating members being pivoted upon the said journal for free pivotal movement thereon.

5. In a device of the type described having a beam with a scraping blade pivotally mounted thereon, the combination of, bui'er' means located rearwardly of said blade, pivoted means having surfaces abutting against buffer means, and hydraulic means including a cylinder, a piston sliding in said cylinder, means con.- necting said piston to the said pivoted means,. a cylinder base having trunnions laterally extending therefrom, extensions adapted to receive said trunnions, and guiding means between said extensions to properly aline the same whereby the cylindrical base trunnions will freely i'lurnabout their axes.

6. In combination, a cross beam, a pair :11" spaced journal members located at each end thereof, shafts extending through each of said pairs of journal members, a mold board support-- ing bracket pivoted upon and depending from each of said shafts, blade mechanism mounted upon said brackets, an actuating member pivoted upon each of said shafts, and rubber means located between said actuating members and the said mold board supporting brackets.

7. A combination of elements as set forth in claim 6 in which said rubber means has a hole therethrough, bolt means extending through the said hole and also through the said actuating member, the mold board supporting brackets each having a slot therein adapted to detachably receive the head of said bolt therein.

8. A combination of elements as set forth in claim 6 in which said blade construction includes two angles rigidly attached to its rear face for the purpose described.

9. In a scraper structure, the combination of, an adjustable supporting beam, journal meansmounted below each end of the said adjustable supporting beam, shafts positioned in said journal means, moldboard supporting brackets; pivotally mounted one on each of the said shafts, actuating members also mounted one on each of said shafts, each of said actuating members having an arm extending upwardly therefrom, scraping means rigidly attached to saidv moldboard supporting brackets, yieldable means; located between said moldboard supporting: brackets and the actuating members and means for moving the said arms of the said actuating members for the purpose described.

EUGENE L. SCHERlVERI-IOBN;