초록

The inventive self-leveling wheelbarrows include novel locking mechanisms for maintaining the wheelbarrow at a horizontally level position relative to the underlying terrain.

대표청구항 ▼

The invention claimed is: 1. A self-leveling wheelbarrow comprising: a. a basin having a front end, a rear end, a left side and a right side; b. a wheel disposed beneath said basin near said front end; c. a handle assembly secured to said basin; d. a rear mounting bracket secured near said rear end

The invention claimed is: 1. A self-leveling wheelbarrow comprising: a. a basin having a front end, a rear end, a left side and a right side; b. a wheel disposed beneath said basin near said front end; c. a handle assembly secured to said basin; d. a rear mounting bracket secured near said rear end of said basin, said mounting bracket having a top end secured beneath said basin; e. a leg assembly, said leg assembly comprising a pair of legs secured to one another by a centrally disposed plate, such that one of said pair of legs is positioned beneath said right side of said basin and the other one of said pair of legs is positioned beneath said left side of said basin, said plate further having a centrally disposed, arcuate top edge and a set of teeth arranged along said top edge; f. a means for movably securing said leg assembly plate to said rear mounting bracket, such that said leg assembly may rotate in a counterclockwise or clockwise direction and in a vertical direction relative to said rear mounting bracket; and g. a locking component secured beneath said basin and positioned above said top edge of said leg assembly plate, wherein said locking component is a C-channel member having a pair of adjacent side walls extending downward, each of said side walls further having a tapered edge; whereby as said leg assembly contacts the underlying ground as the wheelbarrow is parked, said leg assembly rotates about said rear mounting bracket to accommodate the contour angle of the ground, sliding said top edge of said plate within said locking component to thereby engage said tapered edges of said locking component within adjacent teeth of said top edge of said leg assembly plate, thereby locking said plate therein to prevent said leg assembly from rotating further, either in a clockwise direction of travel or a counterclockwise direction of travel. 2. The wheelbarrow of claim 1, wherein each of said side walls of said locking component comprises a notch, each of said notches further including said tapered edge for engagement between adjacent teeth of said top edge of said leg assembly plate when said locking component is so engaged with said top edge of said leg assembly plate. 3. The wheelbarrow of claim 1, wherein said means for movably securing said leg assembly plate to said rear mounting bracket comprises a vertical slot communicating through said rear mounting bracket and a pin extending from said leg assembly plate, said pin slidably engaged within said vertical slot to allow said leg assembly to move vertically within said slot and to rotate in said clockwise and counterclockwise direction about said pin. 4. The wheelbarrow of claim 3, wherein each of said side walls of said locking component comprises a notch, each of said notches further including said tapered edge for engagement between adjacent teeth of said top edge of said leg assembly plate when said locking component is so engaged with said top edge of said leg assembly plate. 5. The wheelbarrow of claim 1, wherein said means for movably securing said leg assembly plate to said rear mounting bracket comprises a vertical slot communicating through said leg assembly plate and a pin extending from said rear mounting bracket, said pin slidably engaged within said vertical slot to allow said leg assembly to move vertically and to rotate in said clockwise and counterclockwise direction about said pin. 6. The wheelbarrow of claim 5, wherein each of said side walls of said locking component comprises a notch, each of said notches further including said tapered edge for engagement between adjacent teeth of said top edge of said leg assembly plate when said locking component is so engaged with said top edge of said leg assembly plate. 7. The wheelbarrow of claim 1, wherein said locking component is secured to said rear mounting bracket. 8. A self-leveling wheelbarrow comprising: a. a basin having a front end, a rear end, a left side and a right side; b. a wheel disposed beneath said basin near said front end; c. a handle assembly secured to said basin; d. a rear mounting bracket secured near said rear end of said basin, said mounting bracket having a top end secured beneath said basin; e. a leg assembly, said leg assembly comprising a pair of rear legs secured to one another by a centrally disposed plate, such that one of said pair of legs is positioned beneath said right side of said basin and the other one of said pair of legs is positioned beneath said left side of said basin below the rear end of said basin; f. a means for movably securing said leg assembly plate to said rear mounting bracket, such that said leg assembly may rotate in a counterclockwise or clockwise direction and in a vertical direction relative to said rear mounting bracket; g. a first locking component secured to said leg assembly, said first locking component comprising an inverted U-shaped member having two opposing ends, each of said ends secured to one of said rear legs, and a central portion disposed between said opposing ends; and h. a second locking component secured beneath said basin and above said central portion of said first locking member, said second locking component comprising a first bar having a slot configured to engage therein said central portion of said first locking component; whereby as said leg assembly contacts the underlying ground as the wheelbarrow is parked, said leg assembly rotates about said rear mounting bracket to accommodate the contour angle of the ground, sliding said central portion of said first locking component within said slot of said second locking component thereby locking said central portion of said first locking component therein to prevent said leg assembly from rotating further, either in a clockwise direction of travel or a counterclockwise direction of travel. 9. The wheelbarrow of claim 8, wherein said locking component comprises a second bar adjacent said first bar, said second bar having a slot configured to engage therein said central portion of said first locking component, said slot of said second bar in registration with said slot of said first bar. 10. The wheelbarrow of claim 8, wherein said means for movably securing said leg assembly plate to said rear mounting bracket comprises a vertical slot communicating through said rear mounting bracket and a pin extending from said leg assembly plate, said pin slidably engaged within said vertical slot to allow said leg assembly to move vertically within said slot and to rotate in said clockwise and counterclockwise direction about said pin. 11. The wheelbarrow of claim 10, wherein said locking component comprises a second bar adjacent said first bar, said second bar having a slot configured to engage therein said central portion of said first locking component, said slot of said second bar in registration with said slot of said first bar. 12. The wheelbarrow of claim 8, wherein said means for movably securing said leg assembly plate to said rear mounting bracket comprises a vertical slot communicating through said leg assembly plate and a pin extending from said rear mounting bracket, said pin slidably engaged within said vertical slot to allow said leg assembly to move vertically and to rotate in said clockwise and counterclockwise direction about said pin. 13. The wheelbarrow of claim 12, wherein said locking component comprises a second bar adjacent said first bar, said second bar having a slot configured to engage therein said central portion of said first locking component, said slot of said second bar in registration with said slot of said first bar. 14. The wheelbarrow of claim 8, wherein said second locking component is secured to said rear mounting bracket. 15. A self-leveling wheelbarrow comprising: a. a basin having a front end, a rear end, a left side and a right side; b. a wheel disposed beneath said basin near said front end; c. a handle assembly secured to said basin; d. a rear mounting bracket secured near said rear end of said basin, said mounting bracket having a top end secured beneath said basin; e. a leg assembly, said leg assembly comprising a pair of rear legs secured to one another by a centrally disposed plate, such that one of said pair of legs is positioned beneath said right side of said basin and the other one of said pair of legs is positioned beneath said left side of said basin below the rear end of said basin; f. a means for movably securing said leg assembly plate to said rear mounting bracket, such that said leg assembly may rotate in a counterclockwise or clockwise direction and in a vertical direction relative to said rear mounting bracket; g. a first locking component secured to said leg assembly, said first locking component comprising an inverted U-shaped member having two opposing ends, each of said ends secured to one of said rear legs, and a central portion disposed between said opposing ends; h. said first locking component further including a series of holes penetrating through said first locking component; h. a second locking component secured beneath said basin above said first locking component, said second locking component comprising a locking pin configured for engagement within one of said holes of said first locking component; whereby as said leg assembly contacts the underlying ground as the wheelbarrow is parked, said leg assembly rotates against said rear mounting bracket to accommodate the contour angle of the ground, sliding said central portion of said first locking component upwards for engagement of said locking pin within one of said holes, thereby locking said central portion of said first locking component therein to prevent said leg assembly from rotating, either in a clockwise direction of travel or a counterclockwise direction of travel. 16. The wheelbarrow of claim 15, wherein the holes of said first locking component are a series of rectangular shaped notches penetrating an outer edge of said locking component, and wherein said locking pin is a rectangular tab configured for locking engagement within one of said notches. 17. The wheelbarrow of claim 15, wherein said means for movably securing said leg assembly plate to said rear mounting bracket comprises a vertical slot communicating through said rear mounting bracket and a pin extending from said leg assembly plate, said pin slidably engaged within said vertical slot to allow said leg assembly to move vertically within said slot and to rotate in said clockwise and counterclockwise direction about said pin. 18. The wheelbarrow of claim 17, wherein the holes of said first locking component are a series of rectangular shaped notches penetrating an outer edge of said locking component, and wherein said locking pin is a rectangular tab configured for locking engagement within one of said notches. 19. The wheelbarrow of claim 15, wherein said means for movably securing said leg assembly plate to said rear mounting bracket comprises a vertical slot communicating through said leg assembly plate and a pin extending from said rear mounting bracket, said pin slidably engaged within said vertical slot to allow said leg assembly to move vertically and to rotate in said clockwise and counterclockwise direction about said pin. 20. The wheelbarrow of claim 19, wherein the holes of said first locking component are a series of rectangular shaped notches penetrating an outer edge of said locking component, and wherein said locking pin is a rectangular tab configured for locking engagement within one of said notches. 21. The wheelbarrow of claim 15, wherein said second locking component is secured to said rear mounting bracket.