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US 4,995,626 AGranted
Foldable tandem bicycle
OwnerHarry D. Montagueinventor
Life of this patent
Estimating the term…
Abstract
A foldable tandem bicycle employs three separate frames joined at concentric seat tubes. The frames have quick release clamps to lock the frames into an open rigid orientation. The center frame has several configurations, male one having a closed complete frame with one diagonal brace and a female one with a pair of diagonal braces to eliminate the need for a top tube.
Claims20
A foldable tandem bicycle frame comprising:
- a front frame,
- a rear frame,
- an integral center frame including
- a first seat tube, a second seat tube, said front frame and said center frame foldable with respect to each other about said first seat tube,
- said center frame and said rear frame foldable with respect to each other about said second seat tube, whereby said front and rear frames fold about respective first and second seat tubes to fold said tandem bicycle frame and said center frame is unaltered in configuration irrespective of whether said tandem frame is open or folded.
2 more elements
A foldable tandem bicycle comprising:
- a front frame having a head set and means for mounting a front fork with a front wheel and handle bars,
- a complete center frame including a first seat tube and a second seat tube, said center frame and said front frame foldable with respect to each other about said first seat tube, a first seat mounted on said first seat tube,
- a rear frame having stays for mounting a rear wheel,
- said center frame and said rear frame foldable with respect to each other about said second seat tube, a second seat mounted on said second seat tube, and a second set of handle bars mounted on said first seat tube behind said first seat, whereby said front and rear frames fold about respective first and second seat tubes to fold said tandem bicycle frame and said complete center frame is unaltered irrespective of whether said bicycle is opened or folded.
1 more element
Dependencies are inferred from the claim text.