The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1995
Filed:
Feb. 28, 1994
Mauricio Mirand, Lakewood, CA (US);
Robert Brown, Jamestown, ND (US);
Jeffrey C Brown, Seattle, WA (US);
Buford H Hopper, Bothell, WA (US);
Harry G Worth, Seattle, WA (US);
Velo Research, Inc., Lynnwood, WA (US);
Abstract
An air pump for use with a chain-driven bicycle having a free wheel. The pump assembly comprises a pair of opposed cylinders and a double-ended piston rod mounted in a housing. The piston rod has a bearing slot, which engages a crank pin on a crankshaft driven by a sprocket. Rotation of the sprocket reciprocates the double-ended piston rod in the cylinders. The cylinders are each integrally formed with a manifold that uses an elastomeric band covering a passage from the cylinder interior to inside the manifold as a one-way valve. An enlarged diameter skirt on each cylinder allows air to enter the cylinder on each intake stroke. A cap defining the piston head is locked onto each piston and holds a seal in place on the piston. An integral clamp assembly allows the pump to be removably mounted on a bicycle chain stay. The lower run of the bicycle drive chain engages the drive sprocket of the pump assembly, and a chain retainer is used to maintain the engagement of the drive chain with the drive sprocket. Reverse rotation of the bicycle's crank assembly causes the conventional free wheel to also rotate in a reverse direction without rotating the wheel of the bicycle. The resulting movement of the chain over the drive sprocket of the pump rotates the drive sprocket, which reciprocates the double-ended piston rod in the cylinders, and pumps air to an article to be inflated, such as the bicycle tire(s).