Extendable pipe unit for frame floor pump

A frame floor pump includes a cylinder having a first end and a second end opposite to the first end, an extendable pump unit having an outer pipe with a first end installed to a side of the second end of the cylinder and a second end, an inner hose disposed through the second end of the outer pipe and received in the outer pipe and a nozzle provided to couple to an end of the inner hose against the second end of the outer pipe; wherein the inner hose of the extendable pipe unit could extend to various lengths from the outer pipe of the extendable pipe unit while operating the frame floor pump; while the frame floor pump is collapsed and not used, the inner hose could be received in the outer pipe so as to be easy to stow.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a pipe unit for a frame floor pump. In particular, the present invention relates to an extendable pipe unit for frame floor pumps.

2. Description of the Related Art

The conventional bicycle pump generally comprises three kinds, floor pump, mini pump and frame floor pump. The floor pump is too big and not easy to carry; the mini pump is effortless to carry but there is no hold to apply force easily while inflating; however, the frame floor pump is easy to stow and has a hold to force.

Referring to Taiwan Patent No. M278776, illustrating a frame floor pump 10 including a cylinder 11 having a first end and a second end, a pipe 13 installed to a side of the second end of the cylinder 11, a nozzle 14 connecting to the pipe 13opposite to the cylinder 11, a collapsible pedal 15 disposed on another side of the second end of the cylinder hand a collapsible handle 16 installed to the first end of the cylinder 11. The collapsible pedal 15 and the handle 16 are easy for stowing. And the pedal 15 allows a user stepping thereon to force to inflate easily. However, while operating the frame floor pump 10, because the length of the pipe 13 is about the same to the length of the cylinder 11, the user needs to take the pump close to a tire of bike so that the distance between the pump and the bike would be not enough to inflate quickly.

SUMMARY OF THE INVENTION

The present invention solves this need and other problems in the field of extendable pipe unit for frame floor pump by providing, a frame floor pump including a cylinder, an extendable pump unit installed pivotally to an end of the cylinder and having an outer pipe, an inner hose received in the outer pipe and a nozzle disposed on the outer pipe and insert into the inner hose. The outer pipe has a first end connecting to the end of the cylinder and a second end providing the inner hose disposed therethrough.

The inner hose of the extendable pipe unit could extend to various lengths from the outer pipe of the extendable pipe unit according as the desire of a user while operating the frame floor pump. And while the frame floor pump is collapsed and not used, the inner hose could be received in the outer pipe so as to be easy to stow.

Other advantages, objectives and features of the present invention will become apparent from the following description referring to the attached drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A frame floor pump according to the preferred embodiment of the present invention is shown in the drawings and includes a cylinder10with a first end coupling to a handle device11, with a second end having a pedal12installed on a side thereof and an extendable pipe unit20pivotally disposed on another side thereof opposite to the pedal12. Thus, a user could hold the handle device11and open the collapsed pedal12to step thereon, while operating the frame floor pump. Furthermore, the extendable pipe unit20could be adjusted to various lengths according as the desire of the user.

The extendable pipe unit20further includes an outer pipe21having a first end211disposed pivotally on the second end of the cylinder10, a second end212opposite to the first end211, a pair of ears213formed on a side of the second end212and wedging the cylinder10for keeping the outer pipe21on the cylinder10therein and a coupling portion214formed on the second end212. The coupling portion214is exterior threads in section.

The extendable pipe unit20further includes an inner hose22having a piston221disposed on an end thereof and a plurality of airtight elements222mounted on the periphery of the inner hose22around the piston221. The inner hose22is received in the outer pipe21.

A retaining device23is installed on the outer pipe21and includes a connecting end231, which has interior threads, formed in the interior of an end thereof and adapted for engaging with the coupling portion214of the outer pipe21, a retaining portion232defined on another end thereof opposite to the connecting end231and a blocking portion233defined between the connecting end231and the retaining portion232. The blocking portion233blocks against the rim (not numbered) of the outer pipe21while the connecting end231engages with the coupling portion214of the outer pipe21.

A joint24is disposed on the retaining device23and includes a fixed portion241defined on an end thereof and coupling to the retaining portion232of the retaining device23and an engaging end242formed in the interior of another end thereof opposite to the fixed portion241. The fixed portion241forms a plurality of lugs244axially thereon and a slot243defined between each two of the lugs244longitudinally. So that the fixed portion241would be flexible.

A nozzle25couples to the joint24and includes an engaging portion251with exterior threads engaging with the engaging end242of the joint24and an insert end252extending from the engaging portion251longitudinally and inserting through the joint24to the inner hose22.

Referring toFIGS. 4 to 5, the inner hose22of the extendable pipe unit20is received in the outer pipe21of the extendable pipe unit20. The piston221is disposed between the inner hose22and the outer pipe21and provided for sealing so that air could not leak from the interspace between the inner hose22and the outer pipe21. The nozzle25is set on the retaining device23by coupling to the joint24.

The fixed portion241of the joint24is flexible via the alternative arrangement of the lugs244and the slots243so that the fixed portion241could be disposed in the retaining portion232of the retaining device23quickly and not easy to come off the retaining device23.

The insert end252of the nozzle25inserts into the inner hose22directly. And the material of the inner hose22is provided with flexibility so that the insert end252and the inner hose22would couple to each other closely. Thus, air could not leak from the connection of the insert end252and the inner hose22and the insert end252of the nozzle25would not easy to come off.

Referring toFIG. 6, while the inner hose22extends to the limit, the airtight elements222of the inner hose22are exactly blocked from the blocking portion233of the retaining device23. Therefore, the inner hose22would not be disengaged from the outer pipe21and air would not leak from the extendable pipe unit20.

Referring toFIG. 7, the ears213of the outer pipe21is disengaged from the cylinder10and the extendable pipe unit20could pivot relative to the cylinder10while a user operates the frame floor pump. Then, the first end211of the outer pipe21could pivot to various positions and the inner hose22would be stretched out from the outer pipe21for inflating. Therefore, the user could stay away from a bike and be easy to force to inflate a tire of bike.

The frame floor pump according to the preferred embodiment of the present invention allows easy and quick operation without troublesome grouping encountered with the prior art frame floor pumps. The length of the extendable pipe unit20is adjustable and while the frame floor pump is operated, the inner hose22of the extendable pipe unit20could extend according as the desire of the user; while the frame floor pump is collapsed, the inner hose22of the extendable pipe unit20could be received in the outer pipe21and shrink to the shortest length for easily stowing. The nozzle25could be firmly disposed on the retaining device23of the extendable pipe unit20via the engagement of the joint24and the nozzle25. And the insert end252of the nozzle25connects to the inner hose22directly, thus, the nozzle25would not be disengaged from the retaining device23.