Land vehicles – Wheeled – Occupant propelled type
Patent
1993-09-20
1995-08-15
Johnson, Brian L.
Land vehicles
Wheeled
Occupant propelled type
280275, 280280, 267293, 267294, B62K 2120
Patent
active
054412919
ABSTRACT:
A front fork suspension for a bicycle provides a front fork having a pair of fork members with ends that support a front wheel therebetween. A handlebar stem assembly is rotatably mountable in a head tube of a bicycle frame. The stem assembly includes, at an upper end, a forwardly-extending handlebar-supporting portion, or stem, that is substantially transverse to an axis of the head tube. A lower linkage is provided having a first end that is pivotally mounted to a lower end of the stem and an opposing second end that is pivotally mounted to a first location on the front fork. An upper linkage is provided having a first end that is pivotally mounted to the handlebar-supporting portion and a second end that is pivotally mounted to a second location on the front fork. A compression spring is attached between the upper linkage and the lower linkage at an attachment point on the upper linkage located substantially at the first end thereof and an attachment point on the lower linkage located substantially between the first end and the second thereof. The upper linkage and the lower linkage are constructed so that the wheel-supporting ends of the front fork displace, in response to an applied force, along a curved path. An adjusting member can be provided to one of the linkages to vary the curved path, hence varying the suspension's ride characteristics.
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patent: 414048 (1889-10-01), Hunter
patent: 423471 (1890-03-01), Easthope
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"Mountain Bike Action", Feb. 1992.
"Mountain Bike Action", Mar. 1992.
"Mountain Bike Action", Mar. 1992.
"Mountain Bike Action", Oct. 1992.
Girvin, Inc.
Johnson Brian L.
Zeender F.
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