US2152899A

US2152899A - Carry type scraper

Info

Publication number: US2152899A
Application number: US124406A
Authority: US
Inventors: Earl B Maloon
Original assignee: Southwest Welding and Manufacturing Co
Current assignee: Southwest Welding and Manufacturing Co
Priority date: 1937-02-06
Filing date: 1937-02-06
Publication date: 1939-04-04
Anticipated expiration: 1956-04-04

Description

A ril 4, 19 39. E. B. MALOON CARRY TYPE SCRAPER Filed Feb. 6, 1937 2 Sheets-Sheet l INVENTOR.

fl fi ATk'ORNEYs A ril 4, 1939. E. B. MALOON CARRY TYPE SCRAPER Filed Feb. 6, 1957 2 Sheets-Sheet 2 INVENTOR.

BY ATTORNEYS Patented Apr. 4, 1939 Y UNITED STATES PATENT on-"ice "CARRY TYPE SCRAPEB nan n. Maloon, South Pasadena, Calif aasignor to Southwest Welding and Manufacturing 00.,

- Inc., Alhambra, Calif., a corporation of Callfornia A Application February a, 1037, Serial no. 124,408

6Claims. (01. 37-120).

This invention relates to a scraping implement such as employed in road building or other operations "where theground is to be leveled off.

l vide a construction in which the major part of the weight of the load and framewill be carried on the rear wheels of the truck.

A type 'of scraper has been employed in which the dirt is collected in a bowl having a movable piston, or pusher at the back of the bowl; and v in the dumping'operation this pusher is moved forwardly so as to eject the load at the front endcf the bowl. One of the objects of this invention is to avoid the necessity for employing a load ejector or pusher of this kind, and to construct the implement in such a way that the lscraping knife or shoe maintains a relatively fixed "{position on the frame, regardless of the movements of the bowl ejecting the load. This facilitates leveling off the dumped earth to a substane tially fixed level; at the. same time, the actual "height r the shoe can be adjusted between the.

scraping and digging position, and the dumping and leveling oi! position.

3 A-further object of theinvention is to improve the general construction of an implement of this type, and to provide a construction in which the bowl, and apron that cooperates with the bowl at its forward end to retain the load, are mounted between side plates of the frame, and in which .the movements of the apron and the bowl are coordinated in the operations of filling the bowl and dumping a load to any desired level.

A further object is to mount the bowl so that 5 the bowl cannot be swung back when encountering an obstruction such as a heavy rock while digging into the earth. I

Further objects of the invention will appear hereinafter.

5 The invention consists in the novel parts and combination of parts to be described hereinafter, all of which contribute to produce an eflicient carry type scraper.

A preferred embodiment of theinvention is 55 described in the following specification, while the 1 RElSSUED broad scope of the invention is pointed out in the appended claims.

In the drawings:

Fig. 1' is a plan of a scraping implement embodying my invention, and illustrating the same attached to the rear end of a tractor, the forward portion of the tractor being broken away,

Fig. 2 is a side elevation of the implement illustrated in Fig. 1.

Fig. dis a vertical section through the implement in a front and rear direction, and illustrating the relation of the parts when the shoe and bowl are held slightly above the.ground level, and showing the apron closing the forward end of the bowl, and assisting in retaining the load.

Fig. 4 is a vertical section similar to Fig. 3, but with certain parts broken away; inthis view the bowl and apron are represented in the relation which they have when the load is being dumped to a level determined by the shoe.

. Referring particularly to the parts, the implement to which I have applied my invention, comported respectively on two forward wheels 3, and

four rear wheels 4. The forward truck I is rigidly secured to two side plates 5 preferably having substantially the outline indicated in Fig. 2.

These parts constitute parts of the frame of the implement, and in accordance with the invention they are connected together in such a way as to enable the plates I to be raised or lowered with respect to the ground level; in other words, these parts constitute the frame of the about midway between the two trucks, at which,

point the arms 8 are connected by pivot bolts or pins 8 to the side plates.-

Rigidly secured to the side arms 8 adjacent the rear ends of the side plates 5, I provide a truss frame ill including a transverse lower beam II and an upper beam l2, which may, if desired, be made of lighter construction than the lower beam. The shoe 6 is preferably rigidly secured at its ends to the side plates 5, and prefer-- ably includes an inclined cutter plate l3 that cuts into the earth when the bowl I is being filled. Adjacent the shoe and preferably at its rear edge, the bowl I is pivotally mounted on a transverse pivot bar II. The forward edgegof the bottom plate l5 of the bowl is preferably connected to prises a forward truck i and a rear truck 2 supthis pivot bar I4 by a piano hinge; that is to say, the forward edge of the bottom plate I5 is formed with integral sleeves l6 bent around the pivot bar l4 and alternating in position with similar sleeves I1 formed integral with the plate I3. This forms a closed hinge connection facilitating the passage of the dirt across this joint; and the sleeves l6 and I! protect the forward edge of the bottom I5 and prevent its being bent out of position by rocks, which may be encountered in the dirt.

The rear end of the bottom plate I5 is preferably bent upwardly to form an integral dished rear head I8 for the bowl, and this head and the bottom plate l5 are preferably braced by side gusset plates 19 that form rudimentary side plates for the bowl. If desired, these gusset plates I! may be made integral with the bottom and rear head 18.

When the bowl is in the position of rest as indicated in Fig.3, thestop bracket 20 carried by the rear end of the bowl, rests against the upper side of the lower beam II, and this limits the downward movement of the rear end of the bowl.

The upper and rear end of the bowl may be braced by a substantially vertical brace plate 2 I, the lower end of which connects to a transverse channel brace 22 and the upper end of which is secured to a substantially horizontal transverse plate 23. In this way the plates 2| and 23 cooperate with the dished head l8 to form a substantially triangular box-form girder at the upper rear end of the bowl.

During the scraping operation with this implement, the shoe 6 is held at a low level so as to engage the dirt to be picked up, and the dirt passes back over the shoe into the rear end of the bowl. As this takes place an apron 24 at the forward end of the bowl is held in an elevated position; that is to say, in a partially open positlon so that as thedirt passes up between the lower edge 25 of the apron and the shoe 6, the dirtrpiling up in the bowl can gravitate in to the bowl, after which the apron would be moved to a closed position so as to retain a relatively large load as indicated by the dotted line 26. The apron is preferably pivotally supported on the pivot pins, or bolts 9, that connect the arms 8 to the side plates 5. The apron preferably includes substantially triangular side plates 21, and includes a bottom plate 28, which preferably consists of a plate bent at a slight angle so that the bottom plate presents a lower panel 28a having greater inclination than the upper panel 28b formed by this plate.

Any suitable means may be employed for effecting the raising of the plates 5 to regulate the elevation of the shoe 6 with respect to the ground level. In the present instance, I have illustrated cable controlling means for raising and lowering the middle portion of the frame of the implement for this purpose, and also cable means for controlling the movements of the apron and the bowl 1. These cables can be operated from a tractor 29 to which the forward end of the implement may be coupled by means of a suitable drawbar 30 (see Fig. l). The cable 3| indicated in full lines in Fig. 1, passes rearwardly from the tractor and around guide sheaves 32 and 33 mounted in a suitable housing--34 (see Fig. 3); and'from this point the cable passes rearwardly and around a substantially horizontal guide to the right side of the implement, and around a guide sheave 36 also in a horizontal plane; and from this point the cable passes rearwardly and down over a substantially vertical guide sheave 31, and thence in a downward run 38 to pass around a series of sheaves 39 mounted at the rear of the lower cross beam II. From this point the cable passes in a series of falls 40 supported on sheaves 4| that are secured to the cross beam, or bolster 42 of the rear truck. In this way the rear truss frame in and the arms 8 are suspended on the falls 40 of this cable, and it is evident that if this cable 3| is taken up the arms 8 will be raised at their forward ends, thereby raising the pivot points 9 and lifting the side plates 5. Inci- F dentally, when this movement takes place, the

wheels 3 and 4 will be brought slightly nearer the connected forward and rear frame members? the front and rear axle.

The cable 43 for controlling the bowl 1 and the apron 24, is indicated in dotted lines in Fig. 1. This cable extends rearwardly from the tractor 29 and passes through suitable guide sheaves 44 and 45 similar to the guide sheaves 32 and 33, and from this point the cable passes rearwardly around a series of guide sheaves 46 from which the cable passes downwardly in a. series of, falls 41 and around a series of sheaves 48 attached to the under or forward side of the bottom plate 28 of the apron 24. When the slack of this cable is taken up, the first effect is to shorten the falls 41, thereby causing a rotation of the apron 24 on the pivot bolts 9. Eventually this will pull the apron up against stops such as the stop 49 illustrated in Fig. 3. After this takes place, slack will commence to be taken up in a horizontal run 50 extending rearwardly from the sheaves 4B, and passing around a sheave 5| that is mounted in a suitable housing 52 above the plate 23 (see Fig. 3) Tension in this substantially horizontal run 50 of this cable will, of course, raise the rear end of the bowl, rotating the same on the pivot bar l4 that supports its forward edge. This will take place about the axes of the wheels of relation of the bowl and apron is indicated in i dumping the earth. In dumping the earth the tractor 29 would pull the implement forwardly so as to permit the load to gravitate through the opening formed "between the lower edge of the apron and the forward edge of the shoe. In doing this, of course, the shoe will level off the dumped earth to the grade indicated by the dotted line 53.

The forward truck I may be mounted on the forward axle 54 in any desired manner, but in the present instance the drawing illustrates a universal connection 55 employed for this purpose, and involving the use of an inclined pin 56 mounted on the upper side of the drawbar 30, the end of this pin being connected by an upper bend 51 to a vertical pin 58 rotatably mounted in the forward part of the forward truck I. This vertical pin 58 corresponds to a king pin, and permits swinging of the axle 54 in a horizontal plane when the truck is turning the implement around.

It should be noted that in digging, the bowl cannot be swung rearwardly by great resistance at the shoe, as .might occur from encountering a heavy rock in the earth. The shoe of the bowl is rigidly secured in the frame and the bowl is hung'on the shoe.

The bowl 1 is located nearer to the rear truck than to the forward truck, and'is supported on the cable falls 40 at the rear truck. The effect is to support most of the weight of the frame and load on the rear truck. This is most advantageous as it distributes most of the total load on the four rear wheels 4.

It is understood that the embodiment of the invention described herein is only one of. the many embodiments this invention may take, and I do not wish to be limited in the practice of the invention, nor in the claims, to the particular embodiment set forth.

What I claim is:

1. In a scraping implement, the combination of a frame including a forward truck with wheels supporting the same, and a rear truck with wheels supporting the same, a frame supported on the trucks and including side plates, a transverse shoe secured'between said side plates, a bowl pivotally mounted to swing up and down on an axis adjacent theshoe, a pivotally supported apron cooperating with the bowl to retain its load, and means operating when actuated, to

swing the apron forwardly and upwardly first, and then to swing the bowl upwardly about its axis at the shoe, for dumping the load.

2. In a scraping implement, the combination of a frame including a forward truck with wheels supporting the same, and a rear truck with wheels supporting the same, a frame supported on the trucks and including side plates, a transverse shoe secured between said side plates, a-

bowl pivotally mounted to swing up and down on an axis adjacent the shoe, a pivotally supported apron cooperating with the bowl to retain the load, a. stop for limiting the upward swinging movement of the apron, and means operating when actuated, to swing the apron forwardly and upwardly first until the same is arrested in its movement by the said stop, and operating thereafter to swing the bowl upwardly about its axis at the shoe, for dumping the load.

3. In a scraping implement, the combination of a frame including a forward truck with wheels for supporting the same, and a rear truck with wheels for supporting the same, a frame including side plates supported on said trucks, a transverse shoe secured between said side plates, a

wl pivotally mounted to swing up and down on an axis adjacent the shoe, an apron pivotally supported to swing on an axis between said side plates and cooperating with the bowl and the shoe to retain the load, sheaves supported by the frame and located adjacent the forward truck,

"sheaves supported on the frame adjacent the rear apron, said cable operating when the apron and bowl are in a position to carry the load, to take up the said fall first, and thereby raise the apron until it strikes thesaid stop, and operating thereafter to raise the rear end of the bowl, and thereby effect the dumping of the truck.

4. In a scraping implement, the combination of a frame including a forward truck with wheels for supporting the same, and a rear truck with wheels for supporting the same, a frame including side plates supported on said trucks, a transverse shoe secured between said side plates, a bowl pivotally mounted to swing up and down on an axis adjacent the shoe, an apron pivotally supported to swing on an axis between said side plates and cooperating with the bowl and the shoe to retain the load. sheaves supported by the frame and located adjacent the forward truck,

sheaves supported on the frame adjacent the rear truck, a sheave attached to the apron, a cable passing over the first-named sheaves and having a fall extending down and around the sheave on the apron and thence extending rearwardly over the second-named sheaves and connected beyond the same with the rear end of the bowl, a stop for limiting the upward swinging movement of the apron, said parts cooperating to enable the cable to hold the apron ina more or less raised position while the implement is loading the bowl, the paying-out of the said cable thereafter operating to permit the apron to descend to close the forward cables for first swinging the apron forwardly and upwardly, and then swinging the bowl about its axis at the shoe and thereby raising the rear end of the bowl to dump the load.

6. In a scraping implement, the combination of a frame including a forward truck with wheels supporting the same, a rear truck with wheels supporting the same, side plates rigid with the forward truck, arms rigid with the rear truck and pivotally attached to the side plates, a transverse shoe secured between said side plates, a bowl pivotally mounted to swing up and down on an axis adjacent the shoe, a pivotally supported apron cooperating with the forward end of the bowl to retain its load, means including cables for first swinging the apron forwardly and upwardly and then raising the rear end of the bowl, and means including cables for raising the rear ends of the side plates, to lift the shoe above the ground level when dumping the load.

EARL B. MALOON.