US3763948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four wheel drive tractors
Assignee: County Commercial Cars Ltd
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Filing: 1971-11-19
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Granted: 1973-10-09
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Expires: 1991-11-19
Abstract
Abstract A four wheel drive tractor has two steerable wheels and two nonsteerable wheels; a footplate; a change speed gear unit arranged in a casing the unit having an upper drive shaft for transmission of torque to the non-steerable wheels; a spur gear rotatable with the said shaft and slidable therealong to engage other gears in the gear unit; an aperture in the gear unit casing adjacent the said spur gear; a housing mounted on the said casing, surrounding the said aperture and extending outwardly and downwardly of the casing to a point below the level of the footplate; a gear wheel mounted within said casing and engaging said spur gear, said gear wheel being of such a width that it is permanently in mesh with the said spur gear during sliding movement of said spur gear along said drive shaft; further gear wheels within the casing forming with said gear wheel a compound gear train extending downwardly below the level of the footplate; and means for transmitting torque from the lower end of the gear train to said two steerable wheels.
Inventors
- 👤 G Eggleton
- 👤 E Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:02
CPC Classifications
B; B60; B60K; B60K17/00; B60K17/34; B60K17/344; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
228 words
A four wheel drive tractor having: a. a pair of steerable wheels and a pair of non-steerable wheels; b. a footplate; c. a change speed gear unit arranged in a casing the unit having an upper drive shaft for transmission of torque to one of said pairs of wheels; d. a spur gear rotatable with the said shaft and slidable therealong to engage different gears in the gear unit, said different gears being axially spaced relatively to said shaft; e. an aperture in the gear unit casing adjacent the said spur gear; f. a housing mounted on the said casing, surrounding the said aperture and extending outwardly and downwardly of the casing to a point below the level of the footplate; g. a gear wheel mounted within said casing and engaging said spur gear, said gear wheel being of such a width that it is permanently in mesh with the said spur gear during sliding movement of said spur gear along said drive shaft irrespective of which of said different gears of the gear unit is in mesh with said spur gear; h. further gear wheels within the housing forming with said gear wheel a compound gear train extending downwardly below the level of the footplate; and i. means for transmitting torque from the lower end of the gear train to the other of said pairs of wheels.
Claim 2
Dependent Claim
228 words
A four wheel drive tractor having: a. a pair of steerable wheels and a pair of non-steerable wheels; b. a footplate; c. a change speed gear unit arranged in a casing the unit having an upper drive shaft for transmission of torque to one of said pairs of wheels; d. a spur gear rotatable with the said shaft and slidable therealong to engage different gears in the gear unit, said different gears being axially spaced relatively to said shaft; e. an aperture in the gear unit casing adjacent the said spur gear; f. a housing mounted on the said casing, surrounding the said aperture and extending outwardly and downwardly of the casing to a point below the level of the footplate; g. a gear wheel mounted within said casing and engaging said spur gear, said gear wheel being of such a width that it is permanently in mesh with the said spur gear during sliding movement of said spur gear along said drive shaft irrespective of which of said different gears of the gear unit is in mesh with said spur gear; h. further gear wheels within the housing forming with said gear wheel a compound gear train extending downwardly below the level of the footplate; and i. means for transmitting torque from the lower end of the gear train to the other of said pairs of wheels.
Claim 3
Dependent Claim
34 words
A four wheel drive tractor as claimed in claim 1, in which there is a passageway extending through the said housing longitudinally of the tractor for passage of a linkage (e.g. a brake linkage).
Claim 4
Dependent Claim
32 words
A four wheel drive tractor as claimed in claim 2 in which the passageway leads through an aperture extending axially through the centre of a gear wheel of the said gear train.
Claim 5
Dependent Claim
32 words
A four wheel drive tractor as claimed in claim 1 in which the means for transmitting torque from the gear train to the other of said pairs of wheels comprises hydraulic means.
Claim 6
Dependent Claim
47 words
A four wheel drive tractor as claimed in claim 4 in which the hydraulic means comprises a hydraulic pump arranged to be driven by the gear train and arranged in turn to drive one or more hydraulic motors associated with the other of said pairs of wheels.
Claim 7
Dependent Claim
45 words
A four wheel drive tractor as claimed in claim 1 in which the means for transmitting torque from the gear train to the other of said pairs of wheels includes a clutch mounted in the said housing at the lower end of the gear train.
Claim 8
Dependent Claim
211 words
A four whEel drive tractor having: a. two steerable wheels and two non-steerable wheels; b. a footplate; c. a change speed gear unit arranged in a casing the unit having an upper drive shaft for transmission of torque to the non-steerable wheels; d. a spur gear rotatable with the said shaft and slidable therealong to engage other gears in the gear unit; e. an aperture in the gear unit casing adjacent the said spur gear; f. a housing mounted on the said casing, surrounding the said aperture and extending outwardly and downwardly of the casing to a point below the level of the footplate; g. a gear wheel mounted within said casing and engaging said spur gear, said gear wheel being of such a width that it is permanently in mesh with the said spur gear during sliding movement of said spur gear along said drive shaft; h. further gear wheels within the casing forming with said gear wheel a compound gear train extending downwardly below the level of the footplate; i. means for transmitting torque from the lower end of the gear train to said two steerable wheels; and j. a passageway extending through the said housing longitudinally of the tractor for passage of a linkage (e.g. a brake linkage).
Claim 9
Dependent Claim
211 words
A four whEel drive tractor having: a. two steerable wheels and two non-steerable wheels; b. a footplate; c. a change speed gear unit arranged in a casing the unit having an upper drive shaft for transmission of torque to the non-steerable wheels; d. a spur gear rotatable with the said shaft and slidable therealong to engage other gears in the gear unit; e. an aperture in the gear unit casing adjacent the said spur gear; f. a housing mounted on the said casing, surrounding the said aperture and extending outwardly and downwardly of the casing to a point below the level of the footplate; g. a gear wheel mounted within said casing and engaging said spur gear, said gear wheel being of such a width that it is permanently in mesh with the said spur gear during sliding movement of said spur gear along said drive shaft; h. further gear wheels within the casing forming with said gear wheel a compound gear train extending downwardly below the level of the footplate; i. means for transmitting torque from the lower end of the gear train to said two steerable wheels; and j. a passageway extending through the said housing longitudinally of the tractor for passage of a linkage (e.g. a brake linkage).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |