Patent US3921743A successfully refreshed from Google Patents.
US3921743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle traction units
Assignee: DEMAC ENGINEERING Ltd
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Filing: 1974-02-04
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Granted: 1975-11-25
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Expires: 1994-02-04
Abstract
Abstract A traction unit having a frame for rigid attachment to the underside of the chassis of a standard truck in place of the rear wheels or all of the wheels and including means for mounting the axle assembly of the truck thereon. The unit includes tracks for engagement around load bearing wheels journalled to the frame, and track drive sprocket wheels for connection to the axle assembly. The arrangement differs from earlier constructions which were not concerned with trucks and were not provided with a frame for rigid connection to a truck body in lieu of the wheels.
Inventors
- 👤 Jack N Parrish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:09
CPC Classifications
B; B62; B62D; B62D55/00; B62D55/04; B62D61/00; B62D61/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A traction unit for converting a standard truck to a tracked vehicle and utilizing the drive axle assembly of said truck, comprising a frame member for supporting engagement beneath the truck chassis, means for detachably clamping the frame member rigidly to the chassis, a plurality of load bearing wheels journalled on bearing axles carried by the frame on each side thereof, means for mounting the drive axle assembly of said truck on said frame member, drive sprocket wheels for driving connection to the axles of said axle assembly and in alignment with the load bearing wheels on opposite sides of the frame member, and a pair of endless track belts for engagement, one on each side of said frame, around said load bearing and sprocket wheels.
Claim 2
Dependent Claim
126 words
A traction unit for converting a standard truck to a tracked vehicle and utilizing the drive axle assembly of said truck, comprising a frame member for supporting engagement beneath the truck chassis, means for detachably clamping the frame member rigidly to the chassis, a plurality of load bearing wheels journalled on bearing axles carried by the frame on each side thereof, means for mounting the drive axle assembly of said truck on said frame member, drive sprocket wheels for driving connection to the axles of said axle assembly and in alignment with the load bearing wheels on opposite sides of the frame member, and a pair of endless track belts for engagement, one on each side of said frame, around said load bearing and sprocket wheels.
Claim 3
Dependent Claim
19 words
A traction unit as claimed in claim 1, including driving means for driving said sprocket wheels through said assembly.
Claim 4
Dependent Claim
24 words
A traction unit as claimed in claim 2, wherein said driving means comprises a drive shaft extending from the vehicle transmission to said assembly.
Claim 5
Dependent Claim
29 words
A traction unit as claimed in claim 3 wherein said driving means comprises sprocket and chain drives drivingly connectable between the axles of said assembly and the sprocket wheels.
Claim 6
Dependent Claim
19 words
A traction unit as claimed in claim 1, wherein the load bearing wheels are resiliently suspended from the frame.
Claim 7
Dependent Claim
21 words
A traction unit as claimed in claim 1 in which said track belts have endless sprocket wheel engaging means mounted thereon.
Claim 8
Dependent Claim
26 words
A traction unit as claimed in claim 1, in which said frame unit is only long enough to support the rear portion of said standard vehicle.
Claim 9
Dependent Claim
23 words
A traction unit as claimed in claim 1, in which said frame unit is long enough to support all of said standard vehicle.
Claim 10
Dependent Claim
31 words
A traction unit as claimed in claim 1, in which said drive means includes control means for selectively driving each of said track belts independently of the other of said belts.
Claim 11
Dependent Claim
41 words
A traction unit as claimed in claim 1, in which said drive means includes control means for driving each of said track belts independently of the other of said belts, and brake means for selectively braking each of the track belts.
References Cited (Backward Citations)
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US3207562A
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US3651879A
Cited
US3710886A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |