Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
244 words
A portable dump box comprising a wheeled carriage including an axle having wheels rotatably mounted at opposite ends thereof, a frame, a dump box, means for tilting said dump box and means for maintaining said frame level, said axle being below and pivotably movable relative to said frame about the longitudinal axis of said carriage, said dump box being hingedly joined to said frame along a longitudinal edge thereof at a point of the frame remote from the ground, said means for tilting said dump box comprising at least one hydraulic jack positioned to pivot said dump box on said hinged joint about an axis longitudinal to said frame, said means for maintaining said frame level comprising a pair of hydraulic jacks, a first member of each jack being fixed to said frame at or near opposite longitudinally extending edges thereof, a second member of each jack being fixed to said axle at or near opposite ends thereof, a hydraulic fluid line extending from one jack to the other, whereby an upward action on the first element in one jack produces a downward reaction on the second element in the other jack, and, valve means in said hydraulic fluid line having an open position permitting two-way flow of fluid and a closed position permitting no flow of fluid, said valve means being in said open position when said dump box is at rest and in said closed position during substantially the entire tilting operation.
Claim 2
Dependent Claim
244 words
A portable dump box comprising a wheeled carriage including an axle having wheels rotatably mounted at opposite ends thereof, a frame, a dump box, means for tilting said dump box and means for maintaining said frame level, said axle being below and pivotably movable relative to said frame about the longitudinal axis of said carriage, said dump box being hingedly joined to said frame along a longitudinal edge thereof at a point of the frame remote from the ground, said means for tilting said dump box comprising at least one hydraulic jack positioned to pivot said dump box on said hinged joint about an axis longitudinal to said frame, said means for maintaining said frame level comprising a pair of hydraulic jacks, a first member of each jack being fixed to said frame at or near opposite longitudinally extending edges thereof, a second member of each jack being fixed to said axle at or near opposite ends thereof, a hydraulic fluid line extending from one jack to the other, whereby an upward action on the first element in one jack produces a downward reaction on the second element in the other jack, and, valve means in said hydraulic fluid line having an open position permitting two-way flow of fluid and a closed position permitting no flow of fluid, said valve means being in said open position when said dump box is at rest and in said closed position during substantially the entire tilting operation.
Claim 3
Dependent Claim
30 words
A portable dump box as claimed in claim 1 wherein said means for tilting said dump box comprises a pair of hydraulic jacks mounted at opposiTe ends of said frame.
Claim 4
Dependent Claim
24 words
A portable dump box as claimed in claim 2 which includes a further axle below and in a fixed spaced relationship with said frame.
Claim 5
Dependent Claim
29 words
A portable dump box as claimed in claim 2 which includes a further axle below and pivotably movable relative to said frame about the longitudinal axis of said frame.
Claim 6
Dependent Claim
47 words
A portable dump box as claimed in claim 2 wherein said valve means is a mechanically activated hydraulic switch having a switching mechanism comprising a spring and opposed thereto a plunger, said switch being open when said spring is compressed and closed when said spring is released.
Claim 7
Dependent Claim
38 words
A portable dump box as claimed in claim 5 wherein said dump box is adapted so that at rest it abuts and depresses said plunger compressing said spring and when tilted it releases said plunger releasing said spring.
Claim 8
Dependent Claim
88 words
A portable dump box as claimed in claim 2 wherein hydraulic fluid is transmitted through a secondary hydraulic fluid line into said hydraulic fluid line extending from one levelling jack to the other from a primary hydraulic fluid line which transmits fluid to said tilting hydraulic jacks, a mechanically activated hydraulic switch having a switching mechanism comprising a spring and opposed thereto a plunger, said switch being open when said spring is compressed and closed when said spring is released, being provided in said secondary hydraulic fluid line.
Claim 9
Dependent Claim
82 words
A portable dump box as claimed in claim 2 wherein hydraulic fluid is transmitted through a secondary hydraulic fluid line into said hydraulic fluid line extending from one levelling jack to the other from a primary hydraulic fluid line which transmits fluid to said tilting hydraulic jacks, a check valve being provided in said secondary hydraulic fluid line, said check valve permitting flow of fluid from said primary to said secondary line but preventing flow from said secondary to said primary line.