Land Grading Machine
OwnerHume W. Colvilleinventor
Life of this patent
Estimating the term…
Abstract
A land grading machine comprising: a frame having support means supporting the frame for movement in a forward direction across a ground surface; a scraper blade for engaging the ground surface during such movement to effect grading by scraping ground material thereonto and therepast; a conveyor positioned and arranged to receive and store ground material from the scraper blade and selectively operable to move so received material away from the scraper blade; whereby when ground material builds up to a predetermined level on a part of the conveyor adjacent the blade, the conveyor can be moved to position a different part thereof adjacent to the scraper blade for reception of ground material.
Claims20
A land grading machine comprising:
- a frame having support means supporting the frame for movement in a forward direction across a ground surface;
- a scraper blade for engaging the ground surface during said movement to effect grading by scraping ground material thereonto and therepast;
- a movable conveyor positioned and arranged to receive and store ground material from the scraper blade;
- control means including sensing means for sensing the height of accumulated scraped ground material;
- and
- drive means for driving the conveyor;
- said control means controlling said drive means to cause the drive means to drive the conveyor to move ground material thereon in a rearward direction away from the scraper blade whenever the height of said accumulated scraped ground material reaches a first predetermined level as sensed by said sensing means, said control means also controlling said drive means to cause the drive means to drive the conveyor to move ground material thereon in a forward direction towards the scraper blade whenever the height of said accumulated scraped ground material falls below a second predetermined level as sensed by said sensing means, said second predetermined level being lower than said first predetermined level, and to maintain the conveyor stationary when the height of said accumulated scraped ground material is sensed by said sensing means to be intermediate said first and second levels.
A land grading machine comprising:
- a frame having support means supporting the frame for movement in a forward direction across a ground surface;
- a scraper blade having a forward scraping edge and for engaging the ground surface during said movement to effect grading by scraping ground material thereonto and therepast;
- a movable conveyor positioned and arranged to receive and store ground material from the scraper blade;
- control means including load sensing means for sensing the build-up of accumulated scraped ground material behind said forward scraping edge;
- and
- drive means for driving the conveyor;
- said control means controlling said drive means to cause the drive means to drive the conveyor to move ground material thereon in a rearward direction away from the scraper blade when the build-up of said accumulated scraped ground material reaches a first predetermined extent as sensed by said sensing means, said control means also controlling said drive means to cause the drive means to drive the conveyor to move ground material thereon in a forward direction towards the scraper blade whenever the build-up of said accumulated scraped ground material falls below a second predetermined extent as sensed by said sensing means, said second predetermined extent being less than said first predetermined extent, and to maintain the conveyor stationary when the build-up of said accumulated scraped ground material is sensed by said sensing means to be intermediate said first and second extents.
Dependencies are inferred from the claim text.