US3687438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motorcycle suspension apparatus
Assignee: Individual
•
Filing: 1970-09-11
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Granted: 1972-08-29
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Expires: 1990-09-11
Abstract
Abstract Each wheel suspension member includes a pair of telescoping tubes, one connected to the cycle frame and the other connected to the wheel axle. As the wheel receives a perturbation, the tubes are telescoped further within one another which forces an enclosed hydraulic fluid through restricting orifice means to damp the effect received at the upper cycle frame. Simultaneously, an enclosed coil spring is compressed by the same action, which also serves to dampen shock and vibration effect. Conduiting for the hydraulic fluid isolates the fluid from a substantial length of the coil spring, thereby obviating fluid entrapment by the spring. On resuming rest condition the coil spring returns the telescoped tubes to their original relationship, at which time the hydraulic fluid returns through the orifice means, again without contacting the major spring length.
Inventors
- 👤 Donn J Rickard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:22
CPC Classifications
B; B62; B62K; B62K25/00; B62K25/04; B62K25/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
301 words
Suspension apparatus, in combination, comprising: first hollow tube means having a closed end and an open end; second hollow tube means having a closed end and an open end, with its open end telescopingly related to the open end of the first tube means, said tubes being generally vertically arranged with the closed end of the second tube means disposed at the lower end; hydraulic damper means having upper and lower ends secured to the inner closed end of said second hollow tube means and extending upwardly within both said first and second hollow tube means, said damper means including, means unitary therewith and spaced from the damper means upper and lower ends for sliding contact with the internal wall surface of said first tube means, and wall means defining a continuous bore with a first outer opening adjacent the upper end, a second outer opening adjacent the lower end, and a third outer opening above the unitary means spaced downwardly from said first opening; a compression coil spring received within said first tube means having one end secured against movement within said first tube means and its other end engaging the means unitary with the damper means; third hollow tube means received within the spring and extending from its upper end for an extent sufficient to enclose a major portion of the upper end of the damper means including the first opening; and a supply of hydraulic fluid received within the second tube means such that applied perturbations to said tube means are damped by the combined action of the spring and hydraulic fluid and on cessation of the perturbations the hydraulic fluid enters the second and third openings, moves along the damper means bore and exits through the first opening into the lower end of the second tube means.
Claim 2
Dependent Claim
301 words
Suspension apparatus, in combination, comprising: first hollow tube means having a closed end and an open end; second hollow tube means having a closed end and an open end, with its open end telescopingly related to the open end of the first tube means, said tubes being generally vertically arranged with the closed end of the second tube means disposed at the lower end; hydraulic damper means having upper and lower ends secured to the inner closed end of said second hollow tube means and extending upwardly within both said first and second hollow tube means, said damper means including, means unitary therewith and spaced from the damper means upper and lower ends for sliding contact with the internal wall surface of said first tube means, and wall means defining a continuous bore with a first outer opening adjacent the upper end, a second outer opening adjacent the lower end, and a third outer opening above the unitary means spaced downwardly from said first opening; a compression coil spring received within said first tube means having one end secured against movement within said first tube means and its other end engaging the means unitary with the damper means; third hollow tube means received within the spring and extending from its upper end for an extent sufficient to enclose a major portion of the upper end of the damper means including the first opening; and a supply of hydraulic fluid received within the second tube means such that applied perturbations to said tube means are damped by the combined action of the spring and hydraulic fluid and on cessation of the perturbations the hydraulic fluid enters the second and third openings, moves along the damper means bore and exits through the first opening into the lower end of the second tube means.
Claim 3
Dependent Claim
54 words
Suspension apparatus as in claim 1, in which the damper means includes a hollow tubular member that extends upwardly within the first tube means and spring, the upper open end of which comprises said first bore opening; and said third tube means being received about the upper end portions of the hollow tubular member.
Claim 4
Dependent Claim
44 words
Suspension apparatus as in claim 2, in which the means unitary with the damper means includes an extension cylinder of outer diameter providing a close fit within the first tube means; the hollow tubular member having its lower end mounted to the extension cylinder.
References Cited (Backward Citations)
US2259589A
Cited
US3447797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |