Land leveling scrapers
First Claim
1. In a land leveling scraper, comprising a frame including a front section for connection to a towing vehicle, a rear section pivotally connected to the front section and having wheels with pneumatic tires carried thereon for engagement with the ground surface, a bucket supported by the frame and having a front opening through which soil may pass and a cutting edge across the lower edge of the front opening, and means including an hydraulically operated, cylinder and piston type actuator connecting the frame sections for causing them to swing about their pivotal connection in order to raise or lower the wheels and thus respectively lower or raise the cutting edge of the bucket with respect to the ground surface, and skid shoes each comprising a plate having a substantially flat bottom surface, and mounting on one of the frame sections for sliding over the ground surface during foward movement of the frame;
- the improvement wherein the forward end of each skid plate is pivotally connected to the one frame section, a leg is pivotally connected at its upper end to said one frame section and at its lower end to the skid plate rearwardly of the forward end thereof, one end of the leg having a cylinder and the other a piston slidable within the cylinder moving the bottom surface of the plate toward or away from the ground surface, and an hydraulic system including a source of hydraulic fluid connected with the cylinders on opposite sides of the pistons thereon.
10 Assignments
0 Petitions
Accused Products
Abstract
There is disclosed a land leveling scraper having skid shoes whose bottom surfaces are free to accommodate and follow irregularities in the ground surface being leveled, and are urged against the ground surface with a force proportional to the load on the bucket of the scraper.
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Citations
10 Claims
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1. In a land leveling scraper, comprising a frame including a front section for connection to a towing vehicle, a rear section pivotally connected to the front section and having wheels with pneumatic tires carried thereon for engagement with the ground surface, a bucket supported by the frame and having a front opening through which soil may pass and a cutting edge across the lower edge of the front opening, and means including an hydraulically operated, cylinder and piston type actuator connecting the frame sections for causing them to swing about their pivotal connection in order to raise or lower the wheels and thus respectively lower or raise the cutting edge of the bucket with respect to the ground surface, and skid shoes each comprising a plate having a substantially flat bottom surface, and mounting on one of the frame sections for sliding over the ground surface during foward movement of the frame;
- the improvement wherein the forward end of each skid plate is pivotally connected to the one frame section, a leg is pivotally connected at its upper end to said one frame section and at its lower end to the skid plate rearwardly of the forward end thereof, one end of the leg having a cylinder and the other a piston slidable within the cylinder moving the bottom surface of the plate toward or away from the ground surface, and an hydraulic system including a source of hydraulic fluid connected with the cylinders on opposite sides of the pistons thereon.
- View Dependent Claims (2, 3, 4, 5, 6)
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7. In a land leveling scraper, comprising a frame having a front end for connection to a towing vehicle, a rear end having wheels with pneumatic tires carried thereon for engagement with the ground surface, a bucket supported by the frame and having a front opening through which soil may pass and a cutting edge across the lower edge of the front opening, means for raising and lowering the cutting edge of the bucket with respect to the ground surface, and skid shoes each comprising a plate having a substantially flat bottom surface which is mounted on the frame for sliding over the ground surface during forward movement of the frame;
- the improvement wherein the forward end of each skid plate is pivotally connected to the frame, a leg having an upper end pivotally connected to the frame and a lower end pivotally connected to the skid plate rearwardly of the forward end of said skid plate, one end of the leg having a cylinder and the other end thereof having a piston slidable within the cylinder to form a variable volume pressure chamber connectible to a source of hydraulic fluid under pressure in order to yieldably urge the leg to extended position and thus the bottom surface of the plate against the ground surface.
- View Dependent Claims (8, 9, 10)
Specification