Dual function bicycle air hand pump

Abstract

The dual function bicycle air hand pump has functions of bicycle air pump and exerciser. The piston of the dual function bicycle air hand pump has installed a piston which has an off-center threaded canal, which can be closed either by a one-way valve threaded tube and or by a bolt. By simply exchanging the one-way valve threaded tube with a bolt and vice versa, the dual function bicycle air hand pump can be used as a bicycle air pump or an exerciser. When one-way valve threaded tube is used to close the off-center threaded canal of the piston the dual function bicycle air hand pump can be used as an air pump to pump air into a bicycle tire. When a bolt is used to close the off-center threaded canal the dual function bicycle air hand pump can be used as an exerciser for the training of muscles. It is very easy to exchange the one-way valve threaded tube with a bolt and vice versa. There are also subsidiary bullet-shaped adjustable air nozzles which have smaller openings to increase the exercise load for better muscular training.

1 . The dual function bicycle air hand pump comprising a threaded top cap, a cylinder, a bottom handle with a threaded cap, a shaft with a handle and a piston, a one-way valve threaded tube, a bolt, an air hose nozzle and one or more subsidiary bullet-shaped adjusting air nozzle or nozzles. 
     
     
         2 . The mentioned threaded top cap of  claim 1  comprising a cap which has an inner thread to allow it to screw onto the mentioned cylinder of  claim 1  and a central hole which locates at the center to allow the mentioned shaft of  claim 1  pass loosely. 
     
     
         3 . The mentioned cylinder of  claim 1  comprising a cylinder which has a chamber to admit snugly and tightly the mentioned piston of  claim 1 , a top threaded end at the top end which can screw into the mentioned top cap of  claims 1  and  2 , an bottom threaded end at the bottom end which can screw into the mentioned bottom handle with a threaded cap of  claim 1 , a threaded connecting tube which is built at the bottom part above and near the above-mentioned bottom threaded end and has a lumen connecting to the above-mentioned chamber. 
     
     
         4 . The mentioned bottom handle with a threaded cap of  claims 1  and  3  comprising a cap, which has inner threads to screw onto the mentioned bottom threaded end of  claim 3 , and an O-shaped handle which is fixed on the top of the above-mentioned cap. 
     
     
         5 . The mentioned shaft with a handle and a piston of  claim 1  comprising a long shaft which is longer than the mentioned cylinder of  claims 1  and  3 , an O-shaped handle which is fixed vertically on the top end of the above mentioned shaft and a piston which is fixed, at its center, to the bottom end of the above mentioned shaft and has an off center threaded canal to admit the mentioned one-way valve threaded tube and bolt of  claim 1 . 
     
     
         6 . The mentioned one-way valve threaded tube of  claim 1  comprising a threaded tube which can screw into the mentioned off center threaded canal of  claim 5  and has a head at one end, a one-way valve at the top of the above mentioned head and a rubber washer which is placed under the above mentioned head to secure airtight. 
     
     
         7 . The mentioned bolt of  claim 1  comprising a bolt which has a bolt head, a threaded stem to screw into the mentioned off center threaded canal of  claims 5  and  6  and a rubber washer which is placed under the above-mentioned bolt head to secure airtight closure. 
     
     
         8 . The mentioned air hose nozzle of  claim 1  comprising a long air hose which has an air nozzle installed at one end to clip on the bicycle air nozzle and a threaded connecting nut installed at the other end to screw airtight onto the mentioned threaded connecting tube of  claim 3 . 
     
     
         9 . The mentioned subsidiary bullet-shaped adjusting air nozzle of  claim 1  comprising bullet-shaped adjusting air nozzle which has internal threads at one end to screw onto the mentioned threaded connecting tube of  claims 3  and  8  and a smaller opening at the other end.