Two cylinder manual air pump
OwnerRo-Pin Wanginventor
Life of this patent
Estimating the term…
Abstract
An air pump comprises a head; an air guiding tube fastened at one end thereof with the head and at another end thereof with a two-way air admitting piston; a first cylinder fitted over the two-way air admitting piston such that the first cylinder can be caused to move back and forth; a first one-way valve disposed in the anterior end of the first cylinder; a second piston disposed in another end of the first cylinder; a first one-way valve permitting air to enter only the first cylinder; a second cylinder fitted movably over the second piston; and a second one-way valve disposed in the second cylinder to permit air to enter only the second cylinder which is fastened with the first cylinder without being able to move in relation to the first cylinder.
Claims6
An air pump comprising:
- a head provided with a connection head engageable with an air valve of a tire;
- an air guiding tube fastened at one end thereof with said head;
- a two-way air admitting piston fastened to another end of said air guiding tube such that said two-way air admitting piston is in communication with said connection head;
- a first cylinder tubular in shape and fitted over said two-way air admitting piston such that said first cylinder can be moved back and forth in the direction of the axis of said air guiding tube;
- and
- a first one-way valve disposed in an anterior end of said first cylinder, which is contiguous to said head, said first one-way valve being capable of permitting air to enter only said first cylinder;
- wherein a second piston is disposed in a posterior end of said first cylinder, which is opposite to said anterior end of said first cylinder, said second piston having an outer diameter greater than that of said first cylinder and being capable of permitting air to move freely into and out of said first cylinder;
- wherein a second cylinder is fitted pivotally over said second piston such that said second cylinder can be caused to move back and forth in the direction of the axis of said first cylinder, said second cylinder having an inner diameter greater than that of said first cylinder and communicating with said first cylinder via said second piston by which a pivoting portion of said second cylinder is sealed off in an airtight manner;
- wherein a second one-way valve is disposed in a posterior end of said second cylinder such that said second one-way valve permits air to enter only said second cylinder;
- and
- wherein said first one-way valve is provided in an outer side thereof with a connection portion engageable with a connection portion located at an anterior end of said second cylinder so as to permit said second cylinder to be fastened with said first cylinder in such a manner that said second cylinder can not be caused to move in relation to said first cylinder.
Dependencies are inferred from the claim text.