US3250026A - Scraper blade - Google Patents

Description

May 10, 1966 OCHER AL 3,250,026

SCRAPER BLADE Filed Dec. 23, 1963 United States Patent 3,250,026 SCRAPER BLADE Alfred J. Jocher, Lombard, and Herbert C. Glesmann, Naperville, Ill., assignors to International Harvester Company, Chicago, Ill., a corporation of New Jersey Filed Dec. 23, 1963, Ser. No. 332,672 3 Claims. (CI. 37-42) The present invention relates generally to improvements in scraper blades and more particularly to new and improved means for absorbing the resulting shock when the blade encounters an obstruction.

In the construction of, scraper blades,.it has been the general practice to mount the blade such that the lower edge can tilt back when an obstruction is encountered. In the prior art devices the blade is normally pivotally mounted and spring biased towards its operative position. When an obstructionis encountered the blade is tilted rearwardly against the action of the spring and when the obstruction'is passed, the spring functions to bias the blade back to its operative position. Abutments are provided to prevent further movement of the blade when it reaches its operative position. During operation material loads placed against thelower edge require that the springs have considerable strength. Therefore when an obstruction is encountered the springs cause the blade to return with extreme force and speed. Since it is desirable to have the blade return to its operative position as fast as possible it is desirable to use strong springs for this purpose. The springs move the blade very swiftly and when the abutments are engaged, the blade comes to a sudden stop transmitting a very the scraper frame.

The general purpose of this invention is to provide a scraper blade which embraces all of the advantages of similarly employed scraper blades and possesses none of the afore-described disadvantages. To attain this, the present invention contemplates the use of a resilient shock member on the blade to serve both as an abutment for stopping the movement of the blade and also as a shock absorber to absorb the impact from the sudden stop. 'This resilient shock member also permits a limited pivotal movement of the top edge of the scraper blade in a rearward direction.

large shock or stress to An object of the present invention is the provision of a scraper blade that will tilt to avoid obstructions and return to its operative position in a shock-free manner.

Another object is to provide a scraper blade that will quickly return to its operative position after encountering an obstruction without the occurrence of a sudden shock. A further object of the invention is the provision of a scraper blade with means to stop the blade in its operative position and to also absorb the shock of the sudden stop. Still another object of the invention is to provide a scraper blade that is permitted, a limited pivotal movement about an axis parallel to its upper and lower edges in either direction and includes means for biasing the blade toward its normal operative position.

These and other objects of the invention will become more apparent from the specification and drawings wherein:

FIGURE 1 is a perspective view of a vehicle having a scraper blade mounted thereon;

FIGURE 2 is a perspective view of the back of applicants scraper blade;

FIGURE 3 is a side view of applicants scraper blade; and

FIGURE 4 is a cross-sectional view of the scraper blade taken along lines 4-4 of FIGURE 2.

Referring now to the drawings wherein like reference characters designate like or corresponding parts through- P CC out the several views, there is shown in FIGURE 1 9. ve-

hicle 1 having wheels 2 and a bumper 3. A pair of mounts 4 are secured to the vehicle frame that have open slots 5 that are used in securing the scraper blade to the vehicle as shall be presently described in more detail.

The mounts 4 are also provided with stub shafts 6 that re-' ceive spring clips 7.

The scraper blade, generally designated 10, is pivotally carried by the mounts 4 and its elevation can be adjusted or controlled by the hydraulic lift 20.

Referring now to FIGURES 2, 3 and 4, the scraper blade shall be described in detail. The scraper blade includes a moldboard 11 having a longitudinal brace member 14 secured to its back surface along its upper edge. The longitudinal brace member 14 functions to add rigidity to the moldboard to provide a means upon which to mount the S-shaped resilient shock member 18 and the springs 33. A pair of vertical brace members 15 are secured to the back surface of the moldboard and extend from the longitudinal brace member 14 downwardly towards the moldboards lower edge. The vertical brace members 15 function to add rigidity to the moldboard 11 and also to provide means upon which the main frame 12 can be pivotally connected to the moldboard 11. A lower rib 16 is secured to the back surface of the moldboard and functions to add rigidity and support to the moldboard and also to the vertical brace members 15. The S-shaped resilient shock member 18 is secured as by welding along the upper face of the longitudinal brace member 14. A notch 19 is formed in the lower lip of the S-shaped resilient shock member that is adapted to receive the abutment member 24 of the main frame. The S-shaped resilient shock member 18 forms in effect a cantilever spring for absorbing the shock created by the moldboard when it is returned to its. operative position by the springs 33.

The main frame 12 of the scraper blade 10 includes a base 21 and a mounting section 22. As can be best seen in FIGURE 4, the mounting section 22 is pivotally connected to the base 21 by a pivot pin 26. The abutment member 24, that is secured to the base section 21 is coaxial to the pivot pin 26. Thus, when the mounting section 22 is pivoted with respect to the base 21, the abutment member 24 rotates in the notch 19 of the S-shaped resilient shock member 18. A locking pin 25 is mounted in the base 21 and is adapted to extend. through one of a plurality of apertures 29 formed in the mounting section 22. The locking pin 25 has a top shoulder 26 that stops the downward movement of the pin and a bottom shoulder 27 that forms a means against which a spring 28 can react. The spring 28 reacting against the bottom shoulder 27 biases the locking pin downwardly to thus lock the mounting section 22 in a selected position with respect to the base member 21.

If it is desired to place-the moldboard 11 at an angle with respect to the direction of travel of the vehicle the locking pin 25 is raised against the action of the spring 28 thereby freeing the moldboard and the mounting section 22 from the main frame 21 for pivotal movement. When the desired position is reached and the locking pin 25 is'in alignment with one of the plurality of apertures 29 the pin is released and permitted to drop into the aperture 29 thus locking the moldboardand mounting frame 22 in place with respect to the base 21. The base section 22 has a pivot shaft 23 secured thereto that is adapted to extend through apertures in the pair of vertical brace members 15, to pivot-ally connect the mounting frame 22 to the moldboard 11. Means, such as cotter pins 24, are used to hold the pivot shaft 23 in place. A-pair of eyelets 45 are secured to the mounting frame 22 and are adapted to receive one end of the springs 33. The other end of the springs 33 are adapted to extend through apertures formed in the longitudinal 2% base member 14. The springs 33 function to bias the moldboard in a counterclockwise direction, as seen in FIGURES 3 and 4. This counterclockwise rotation of the moldboard is stopped when the abutment member 24 engages the notch 19 in the S-shaped resilient shock member 18. Thus, if the lower edge of the moldboard 11 encounters an obstruction the moldboard 11 is pivoted about the shaft 23 until the obstruction is overcome, as seen in broken lines of FIGURE 4. Once the obstruction is past, the springs 33 function to rotate the moldboard in a counterclockwise direction towards its normal operative position. When the abutment member 24 engages the notch 19, the moldboard is not brought to a sudden abrupt stop but rather the S-shaped resilient shock member 18 yields to absorb the shock created by bringing the moldboard to a stop. Further, if the top edge of the moldboard were to engage an obstruction, the moldboard will be permitted, by the S-shaped resilient shock member, a certain amount of movement in the counterclockwise direction, as seen in FIGURES 3 and 4. Referring now to FIGURES l and 2 the means for connecting the scraper blade 10 to the Vehicle 1 will be discussed. As seen in FIGURE 2, a shaft 30 is mounted in the free end of the base section 21 of the main frame. The shaft 30 has end portions which extend outwardly from the mounting section 22. The free end of the mounting section 22 is dimensioned such that it substantially fits between the mounts 4 carried by the vehicle. The end portions of the shaft 30 are placed in the open slots of the mounts 4. The shackles 31 are formed from a piece of sheet material having a pair of spaced apertures formed therein. The apertures in the shackles 31 are spaced such that one receives stub shaft 6 mounted on the mount 4 and the other receives the end portion of the shaft 30. Spring clips 32 are provided to hold the shackles 31 in place on the stub shafts 6 and the end portions of the shaft 30.

With a mounting such as this the scraper blade can be connected and disconnected from the vehicle by merely disengaging the spring clips 32 and the chain 50 that extends from the hydraulic lift 20.

The hydraulic lift includes a first U-shaped channel member 34 and a second U-shaped channel member 35 that is pivotally connected to the member 34. A hydraulic jack 40 is pivotally connected at one end to the first U-shaped channel member 34 and also at its other end to the second U-shaped channel member 35. When hydraulic fluid under pressure is directed to the hydraulic jack 40 channel member 35 pivots with respect to the channel member 34 and through the chain 50 the vertical position of the scraper blade 10 is thus controlled.

It should be understood of course that the foregoing disclosure relates to only a preferred embodiment of the invention and that numerous modifications or alterations may be made therein without departing from the spirit and the scope of the invention, as set forth in the appended claims.

What is claimed is:

1. In a scraper blade including a moldboard, having a front and rear surface, a top edge and a bottom edge, a longitudinal brace member secured to the rear surface of said moldboard along said top edge, a pair of vertical brace members secured to the rear surface of said moldboard, said vertical brace members being spaced from each other and extending from said longitudinal brace member downwardly to the bottom edge of said moldboard, an S-shaped resilient shock member secured along one of its lips to said longitudinal brace member between said pair of vertical brace members, a main frame adapted to be connected at one end to a vehicle and pivotally connected at its other end to the pair of vertical brace members, an abutment member carried by said main frame member such that it will be engaged by said S-shaped resilient shock member when the top edge of the moldboard is pivoted rearwardly, and spring means interconnecting said longitudinal brace member and said main frame to bias said S-shaped resilient shock member into engagement with said abutment member.

2. The invention as set forth in claim 1 wherein said main frame includes a base, a mounting section pivotally connected to said base about a substantially vertical axis and means for locking said base and mounting section in a selected position relative to each other.

3. The invention as set forth in claim 2 wherein the pivotal connection between the main frame and said pair of vertical brace members is located on the mounting section of said main frame and said abutment member is mounted on the base of said main frame.

References Cited by the Examiner UNITED STATES PATENTS 1,050,508 1/ 1913 Ahrweiler 267-54 C 1,786,974 12/1930 Abbe 37-42 2,225,614 12/1940 Ball 3742 2,264,368 12/1941 Gettelman 3742 2,616,191 11/1952 Cook et al. 3742 FOREIGN PATENTS 27,442 6/1955 Finland.

ABRAHAM G. STONE, Primary Examiner.

F. B. HENRY, Assistant Examiner.

Claims (1)

1. IN A SCRAPER BLADE INCLUDING A MOLDBOARD, HAVING A FRONT AND REAR SURFACE, A TOP EDGE AND A BOTTOM EDGE, A LONGITUDINAL BRACE MEMBER SECURED TO THE REAR SURFACE OF SAID MOLDBOARD ALONG SAID TOP EDGE, A PAIR OF VERTICAL BRACE MEMBERS SECURED TO THE REAR SURFACE OF SAID MOLDBOARD, SAID VERTICAL BRACE MEMBERS BEING SPACED FROM EACH OTHER AND EXTENDING FROM SAID LONGITUDINAL BRACE MEMBER DOWNWARDLY TO THE BOTTOM EDGE OF SAID MOLDBOARD, AN S-SHAPED RESILIENT SHOCK MEMBER SECURED ALONG ONE OF ITS LIPS TO SAID LONGITUDINAL BRACE MEMBER BETWEEN SAID PAIR OF VERTICAL BRACE MEMBERS, A MAIN FRAME ADAPTED TO BE CONNECTED AT ONE END TO A VEHICLE AND PIVOTALLY CONNECTED AT ITS OTHER END TO THE PAIR OF VERTICAL BRACE MEMBERS, AN ABUTMENT MEMBER CARRIED BY SAID MAIN FRAME MEMBER SUCH THAT IT WILL BE ENGAGED BY SAID S-SHAPED RESILIENT SHOCK MEMBER WHEN THE TOP EDGE OF THE MOLDBOARD IS PIVOTED REARWARDLY, AND SPRING MEANS INTERCONNECTING SAID LONGITUDINAL BRACE MEMBER AND SAID MAIN FRAME TO BIAS SAID S-SHAPED RESILIENT SHOCK MEMBER INTO ENGAGEMENT WITH SAID ABUTMENT MEMBER.

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