Patent CA527768A successfully refreshed from Google Patents.
Patent US3674312A successfully refreshed from Google Patents.
US3674312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double box dump trailer
Assignee: Individual
•
Filing: 1970-07-17
•
Granted: 1972-07-04
•
Expires: 1990-07-17
Abstract
Abstract A double box dump trailer in which a relatively long rear box is mounted on the trailer for dumping with a hydraulic mechanism. A somewhat smaller forward box is mounted on the trailer for dumping into the rear box with a hydraulic mechanism. The forward box is provided with an upwardly sloping dumping chute which overlies the rear box when the front box is raised to its fullest extent.
Inventors
- 👤 Cecil N O'rear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:27
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/04; B60P1/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A dumping trailer comprising a generally horizontal frame supported at one end by ground engaging wheels and adapted for support at the opposite end by a tractor truck, a box, means mounting said box on the rear end of said frame for pivotal movement about a transverse axis to a dumping position, a second box, and means mounting said second box on said frame forwardly of said first box for pivotal movement about a transverse axis to a dumping position overlying said first box, said second box having a height substantially greater than the height of said first box and a width slightly less than the width of said first box whereby upon pivotal movement of said second box into position over said first box the contents of said second box will dump into said first box.
Claim 2
Dependent Claim
137 words
A dumping trailer comprising a generally horizontal frame supported at one end by ground engaging wheels and adapted for support at the opposite end by a tractor truck, a box, means mounting said box on the rear end of said frame for pivotal movement about a transverse axis to a dumping position, a second box, and means mounting said second box on said frame forwardly of said first box for pivotal movement about a transverse axis to a dumping position overlying said first box, said second box having a height substantially greater than the height of said first box and a width slightly less than the width of said first box whereby upon pivotal movement of said second box into position over said first box the contents of said second box will dump into said first box.
Claim 3
Dependent Claim
27 words
A device as claimed in claim 1 wherein the means mounting said first box includes a hydraulic cylinder for raising said first box to a dumping position.
Claim 4
Dependent Claim
27 words
A device as claimed in claim 2 wherein the means mounting said second box includes a hydraulic cylinder for raising said second box to a dumping position.
Claim 5
Dependent Claim
53 words
A device as claimed in claim 1 wherein said first box has a generally horizontal bottom wall, spaced apart parallel side walls, a transverse forward end wall connecting said side walls and extending upwardly from said bottom wall, and a tail gate pivotally mounted to the rear upper edges of said side walls.
Claim 6
Dependent Claim
62 words
A device as claimed in claim 1 wherein said second box has a generally rectangular generally horizontal bottom wall, an upwardly and rearwardly sloping extension integrally formed on said bottom wall, a pair of oppositely disposed parallel side walls extending upwardly from said bottom wall and said extension, and a front wall extending upwardly from said bottom wall connecting said side walls.
Claim 7
Dependent Claim
35 words
A device as claimed in claim 5 wherein said means mounting said second box includes a pair of frame members secured to said second box and extending generally horizontally rearwardly for connection to said frame.
References Cited (Backward Citations)
US2490532A
Cited
US2770490A
Cited
US3120408A
Cited
US3152837A
Cited
US3378302A
Cited
US3361477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |