| 摘要 |
The disclosed manually operated bicycle pump is portable on the frame of a bicycle and need not be detached from the bicycle frame when in use. The disclosed pump transfers substantially the same volume of air to a pneumatic tube or tire on both inward and outward strokes and preferably employs a more efficient double u-cup seal structure in the piston head assembly. In addition, the disclosed pump preferably employs a more efficient and easily manufacturable flex value structure to seal or open an air inlet port. The disclosed pump design allows the body of the pump to be anchored such that the user is free to use a more efficient set of human musculature to operate the pump.
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