Patent US3990718A successfully refreshed from Google Patents.
US3990718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin pull unit for agricultural implements
Assignee: Individual
•
Filing: 1975-05-12
•
Granted: 1976-11-09
•
Expires: 1995-05-12
Abstract
Abstract The invention is concerned with a twin tow unit which enables a single tractor to pull two agricultural implements simultaneously. The unit comprises a substantially elongated inverted U-shaped main member, the forward end of which is supported on at least one castor mounted land wheel and the rear end of which is supported on at least one land wheel. Means are provided for locking the rear land wheel in position and links are provided for coupling the front and rear end of the unit to a tractor and each end of the unit is provided with hitching means to which the tow bar of an agricultural unit may be attached.
Inventors
- 👤 Colin John Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:09
CPC Classifications
B; B62; B62D; B62D13/00; B60; B60D; B60D1/00; B60G; B60G1/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
A twin tow unit comprising a substantially inverted U-shaped main member, the forward end of which is supported on at least one castor mounted land wheel and the rear end of which is supported on at least one land wheel, means for locking the rear wheel in the desired direction of travel, means for hitching implements to the unit adjacent the front and rear land wheels, a first tow bar extending forwardly from the forward end of the unit and a second tow bar from the rear end of the unit to the forward portion of the first tow bar, the horizontal portion of the main member being divided into two sections, the first section being slidably positioned with the second section which is fixed to the upper end of the rear vertical portion of the main member, said second section being provided with diametrally opposed transverse rollers one bearing against the upper surface of the first section and the other bearing against the undersurface of the first section and with clamping means adapted to engage said first section.
Claim 2
Dependent Claim
179 words
A twin tow unit comprising a substantially inverted U-shaped main member, the forward end of which is supported on at least one castor mounted land wheel and the rear end of which is supported on at least one land wheel, means for locking the rear wheel in the desired direction of travel, means for hitching implements to the unit adjacent the front and rear land wheels, a first tow bar extending forwardly from the forward end of the unit and a second tow bar from the rear end of the unit to the forward portion of the first tow bar, the horizontal portion of the main member being divided into two sections, the first section being slidably positioned with the second section which is fixed to the upper end of the rear vertical portion of the main member, said second section being provided with diametrally opposed transverse rollers one bearing against the upper surface of the first section and the other bearing against the undersurface of the first section and with clamping means adapted to engage said first section.
Claim 3
Dependent Claim
181 words
A twin tow unit comprising a substantially inverted U-shaped main member, the forward end of which is supported on at least one castor mounted land wheel, and the rear end of which is supported on at least one land wheel, means for locking the rear wheel in the desired direction of travel, means for hitching implements to the unit adjacent the front and rear land wheels, a first tow bar extending forwardly from the forward end of the unit and a second tow bar from the rear end of the unit to the forward portion of the first tow bar, the forward end of the second tow bar being connected to a bracket on the forward portion of the first tow bar and the weight of the second tow bar being counter-balanced by means of at least one coil spring positioned between and positioned intermediate the end of the second tow bar and the upper end of a post projecting upwardly from the first tow bar adjacent the position of attachment of the second tow bar to the first tow bar.
Claim 4
Dependent Claim
181 words
A twin tow unit comprising a substantially inverted U-shaped main member, the forward end of which is supported on at least one castor mounted land wheel, and the rear end of which is supported on at least one land wheel, means for locking the rear wheel in the desired direction of travel, means for hitching implements to the unit adjacent the front and rear land wheels, a first tow bar extending forwardly from the forward end of the unit and a second tow bar from the rear end of the unit to the forward portion of the first tow bar, the forward end of the second tow bar being connected to a bracket on the forward portion of the first tow bar and the weight of the second tow bar being counter-balanced by means of at least one coil spring positioned between and positioned intermediate the end of the second tow bar and the upper end of a post projecting upwardly from the first tow bar adjacent the position of attachment of the second tow bar to the first tow bar.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |