Patent US4558878A successfully refreshed from Google Patents.
US4558878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All terrain cycle with steering stabilizer
Assignee: Individual
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Filing: 1983-09-23
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Granted: 1985-12-17
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Expires: 2003-09-23
Abstract
Abstract An improved all terrain cycle having a single front steerable wheel mounted on a pivotable frame having a steering stabilizer affixed thereto. The steering stabilizer is a damper assembly which has a piston held within a fluid filled cylinder linked to the frame of the cycle at one end and to the frame of the steering assembly at the other end. The resulting cycle is much easier to control because rapid movement of the handlebars which occurs when the front wheel hits rough terrain is effectively eliminated.
Inventors
- 👤 Donald L. Motrenec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:54
CPC Classifications
B; B62; B62K; B62K5/00; B62K5/02; B62K5/027; B62K21/00; B62K21/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
168 words
An improved all terrain cycle of the type having a single front steerable wheel mounted on a pivotable frame, which pivotable frame is held by a main frame of the vehicle which pivotable frame is turned by the movement of a pair of handlebars wherein the improvement comprises: a damper assembly having a piston held within a fluid filled cylinder, said damper assembly being pivotably connected at a first end to the pivotable frame at a distance between three and one-half and six inches from the axis of rotation of the pivotable frame and at a second end to the main frame of the vehicle at a point substantially rearward with respect to the first end and near the line of intersection of an imaginary vertical plane that includes a central longitudinal axis of the cycle and an imaginary plane which is perpendicular to the axis of rotation of the pivotable frame and which passes through the point of connection of the first end of the damper assembly.
Claim 2
Dependent Claim
168 words
An improved all terrain cycle of the type having a single front steerable wheel mounted on a pivotable frame, which pivotable frame is held by a main frame of the vehicle which pivotable frame is turned by the movement of a pair of handlebars wherein the improvement comprises: a damper assembly having a piston held within a fluid filled cylinder, said damper assembly being pivotably connected at a first end to the pivotable frame at a distance between three and one-half and six inches from the axis of rotation of the pivotable frame and at a second end to the main frame of the vehicle at a point substantially rearward with respect to the first end and near the line of intersection of an imaginary vertical plane that includes a central longitudinal axis of the cycle and an imaginary plane which is perpendicular to the axis of rotation of the pivotable frame and which passes through the point of connection of the first end of the damper assembly.
Claim 3
Dependent Claim
34 words
The all terrain cycle of claim 1 wherein the first end of the damper assembly is connected at a point about four and one-half inches form the axis of rotation of the pivotable frame.
Claim 4
Dependent Claim
79 words
The all terrain cycle of claim 1 wherein the piston in said damper assembly is a ported disk having a flexible member held near an entrance to at least one of the ports thereof and positioned away from the entrance when there is no rapid flow of fluid into said port but which moves in front of said port when there is a rapid flow of fluid therethrough whereby sudden turning of the front steerable wheel is greatly retarded.
Claim 5
Dependent Claim
25 words
The all terrain cycle of claim 3 wherein the piston in said damper assembly has flexible members held near respective sides of the ported disk.
Claim 6
Dependent Claim
15 words
The all terrain cycle of claim 3 wherein said flexible member is a flexible disk.
Claim 7
Dependent Claim
14 words
The all terrain cycle of claim 4 wherein said flexible members are flexible disks.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |