Patent US4576393A successfully refreshed from Google Patents.
US4576393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bicycle suspension
Assignee: Alex Moulton Ltd
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Filing: 1983-12-01
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Granted: 1986-03-18
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Expires: 2003-12-01
Abstract
Abstract A resilient suspension system for the front wheel of a bicycle includes a steering column supported on the frame of the bicycle and supports a handle bar at the upper end and a resilient suspension assembly at the opposite end. The suspension system includes a pair of main forks which are carried by a crown member mounted on the bottom of the steering column and the forks are displaced to the rear of the longitudinal centerline of the column. A subsidiary fork assembly is mounted within the steering column and extends generally along a common longitudinal axis to cooperate with the main forks to support the front wheel of the bicycle in a resilient fashion. The subsidiary forks and the main forks are interconnected by a pair of pivotal links which will permit relative movement between the main forks and the subsidiary forks in response to surface irregularities and transmit such movement to a compression assembly disposed within the steering column.
Inventors
- 👤 Alexander E. Moulton
- 👤 Philip B. Uncles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:50
CPC Classifications
B; B62; B62K; B62K25/00; B62K25/04; B62K25/12; B62K25/14; B62K25/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
269 words
A resilient suspension system for the front wheel of a bicycle comprising a supporting frame (1), a steering column (1A) rotatably mounted within said frame and carrying a first crown (6) element at one end thereof, and a stem (5) supporting a handle bar (5A) at the other end, a primary fork including a pair of primary fork arms (7) mounted on said crown (6) with its longitudinal axis displaced to the rear and generally parallel to the axis of said steering column (1A), said primary fork extending downwardly from said crown and terminating in a hinge pin support (14), a subsidiary fork assembly includes a second crown (10A) from which a pair of subsidiary fork arms (10) extend downwardly and supporting at their lowermost end an articulated connection configured to receive and support each end of a wheel spindle (9), a pair of links (13) pivotally interconnecting the primary and subsidiary forks adjacent each end of the spindle, a push rod (11) mounted on said second crown (10A) and extending vertically therefrom into the lower end of said steering column, and a compression assembly including a compression spring (22) within said steering column and connected to said push rod (11) for controlling resilient vertical movement of said suspension system, and wherein a slidable buffer (23) is interposed between said compression spring (22) and said second crown (10A), said buffer (23) being slidable within the steering column (1a) in response to movement of the crown (10A) and said push rod (11), said buffer (23) being threaded on to the push rod (11) and being adjustable axially of the rod.
Claim 2
Dependent Claim
269 words
A resilient suspension system for the front wheel of a bicycle comprising a supporting frame (1), a steering column (1A) rotatably mounted within said frame and carrying a first crown (6) element at one end thereof, and a stem (5) supporting a handle bar (5A) at the other end, a primary fork including a pair of primary fork arms (7) mounted on said crown (6) with its longitudinal axis displaced to the rear and generally parallel to the axis of said steering column (1A), said primary fork extending downwardly from said crown and terminating in a hinge pin support (14), a subsidiary fork assembly includes a second crown (10A) from which a pair of subsidiary fork arms (10) extend downwardly and supporting at their lowermost end an articulated connection configured to receive and support each end of a wheel spindle (9), a pair of links (13) pivotally interconnecting the primary and subsidiary forks adjacent each end of the spindle, a push rod (11) mounted on said second crown (10A) and extending vertically therefrom into the lower end of said steering column, and a compression assembly including a compression spring (22) within said steering column and connected to said push rod (11) for controlling resilient vertical movement of said suspension system, and wherein a slidable buffer (23) is interposed between said compression spring (22) and said second crown (10A), said buffer (23) being slidable within the steering column (1a) in response to movement of the crown (10A) and said push rod (11), said buffer (23) being threaded on to the push rod (11) and being adjustable axially of the rod.
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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |