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US3638746A Expired / Lapsed US ⏱️ 0.0 years remaining

Motorcycle having two tandem driving wheels

Assignee: RIGHT WAY Mfg CORP
•
Filing: 1970-07-27
•
Granted: 1972-02-01
•
Expires: 1990-07-27
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Abstract

Abstract A three-wheeled motorcycle for use on rough terrain has a main frame and a front guide wheel pivotally mounted thereto. A pair of linkage arms are pivotally mounted at front ends to an intermediate point on the main frame. Rear ends of these arms pivotally support a wheel support frame including a pair of parallel spaced-apart bolsters. Two rear wheels are tandem mounted between the bolsters, the axle carrying the forward wheel of the pair forming the pivot for the connection between the arms and the bolsters, and the axle for the rear wheel of the pair being carried in bearings at rear ends of the bolsters. A pair of parallel, substantially vertical main frame support links are pivotally mounted to the wheel support frame at the bolsters onethird of the bolster length from the rear thereof and are pivotally mounted to the main frame substantially directly above the connection to the wheel support frame. A positive chain drive is provided from sprockets pivotally mounted concentrically with the mounting point of the linkage arms to the main frame to sprockets driving on said wheel axles. Means is provided for limiting downward pivotal movement of the linkage arms during steep hill climbing use of the vehicle on rough terrain.

Inventors

  • 👤 Lawrence A Gostomski

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 09:16
CPC Classifications
B; B62; B62D; B62D61/00; B62D61/06; B62K; B62K5/00; B62K5/02; B62K5/027

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 121 words
A tandem-wheeled vehicle including a main frame, a front guide wheel assembly on the main frame, a wheel support frame, a forward wheel rotatably mounted on a forward end of the wheel support frame, a rear wheel rotatably mounted on a rear end of the wheel support frame, a linkage arm pivotally mounted at a forward end to an intermediate portion of the main frame and at a rear end to the forward end of the wheel support frame, a main frame support link pivotally mounted at a bottom end to an intermediate portion of the wheel support frame and at a top end to the main frame, and means carried by said vehicle to drive said forward and rear wheels.
Claim 2
Dependent Claim 121 words
A tandem-wheeled vehicle including a main frame, a front guide wheel assembly on the main frame, a wheel support frame, a forward wheel rotatably mounted on a forward end of the wheel support frame, a rear wheel rotatably mounted on a rear end of the wheel support frame, a linkage arm pivotally mounted at a forward end to an intermediate portion of the main frame and at a rear end to the forward end of the wheel support frame, a main frame support link pivotally mounted at a bottom end to an intermediate portion of the wheel support frame and at a top end to the main frame, and means carried by said vehicle to drive said forward and rear wheels.
Claim 3
Dependent Claim 23 words
The combination as specified in claim 1 wherein said support link includes a resilient, shock-absorbing member between the top and bottom pivotal mountings.
Claim 4
Dependent Claim 105 words
The combination as specified in claim 1 wherein: said linkage arm pivots at said rear end on an axis coincident with the axis of rotation of said forward wheel; and said drive means includes a prime mover mounted on said main frame, a drive train mounted on the main frame including a pulley rotatably mounted on the axis of the pivotal connection between the linkage arm and the main frame, pulleys mounted on the axis of each of said tandem mounted wheels and each drivably connected to its wheel, and drive belt means drivably connecting said wheel pulleys to said pulley on said main frame.
Claim 5
Dependent Claim 30 words
The combination as specified in claim 3 wherein said support link is pivoted to the main frame at position substantially directly above its pivotal connection to said wheel support frame.
Claim 6
Dependent Claim 22 words
The combination as specified in claim 4 wherein said support link includes a shock-absorbing member between said top and bottom pivotal mountings.
Claim 7
Dependent Claim 34 words
The combination as specified in claim 5 wherein said support link is pivotally connected to said wheel support frame about one-third of the way from the rear wheel axis toward the front wheel axis.
Claim 8
Dependent Claim 26 words
The combination as specified in claim 5 and disengageable means to prevent downward movement of said forward wheel below a predetermined distance under said rear wheel.
Claim 9
Dependent Claim 79 words
The combination as specified in claim 7 wherein sAid disengageable means includes a limit arm pivotally mounted on the main frame and a stop bracket integral with and extending from said limit arm, said limit arm being movable between a first limiting position where said stop bracket is in interfering, limiting relation to downward movement of said linkage arm and a second position where the stop bracket is in clearing, noninterfering relation to the movement of the linkage arm.

References Cited (Backward Citations)

US26775A Cited
US1824975A Cited
US2339886A Cited
US3224523A Cited
US3158220A Cited
US3193039A Cited
US3318403A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-01-31 1975-08-02 1976-02-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-31 1979-08-02 1980-02-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-31 1983-08-02 1984-02-01 $7700.00 Window Closed / Lapsed

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