Pump

Abstract

A pump includes a cylinder including at least one upper aperture and lower aperture. A piston is movable in the cylinder. A rod is connected to the piston. A ring is provided around the rod and fit in the cylinder. An upper collar is formed with at least one countersink hole and provided around the cylinder. At least one upper threaded bolt is driven into the ring through the countersink hole, the upper aperture and an upper elastic washer. A base includes a reduced portion fit in the cylinder. A check valve is provided on the reduced portion of the base. A lower collar is formed with at least one countersink hole and provided around the cylinder. At least one lower threaded bolt is driven into the reduced portion of the base through the countersink hole of the lower collar, the lower aperture and a lower elastic washer.

1 . A pump comprising:
 a cylinder comprising at least one upper aperture and lower aperture;   a piston movable in the cylinder;   a rod connected to the piston;   a ring provided around the rod and fit in the cylinder;   at least one upper elastic washer;   an upper collar formed with at least one countersink hole and provided around the cylinder;   at least one upper threaded bolt driven into the ring through the countersink hole, the upper aperture and the upper elastic washer;   a base comprising a reduced portion fit in the cylinder;   a check valve provided on the reduced portion of the base;   at least one lower elastic washer;   a lower collar formed with at least one countersink hole and provided around the cylinder; and   at least one lower threaded bolt driven into the reduced portion of the base through the countersink hole of the lower collar, the lower aperture and the lower elastic washer.   
   
   
       2 . The pump according to  claim 1 , wherein the base comprises a tread opposite to the reduced portion. 
   
   
       3 . The pump according to  claim 1  comprising a flexible pipe connected to the base. 
   
   
       4 . The pump according to  claim 3  comprising a nozzle connected to the flexible pipe. 
   
   
       5 . The pump according to  claim 1 , wherein the ring comprises at least one recess for receiving the upper threaded bolt. 
   
   
       6 . The pump according to  claim 5  comprising at least one upper nut non-rotationally disposed in the recess and engaged with the upper threaded bolt. 
   
   
       7 . The pump according to  claim 6 , wherein the recess is a non-circular recess, and the upper nut is a non-circular nut disposed in the non-circular recess. 
   
   
       8 . The pump according to  claim 6 , wherein the upper elastic washer is disposed in the recess. 
   
   
       9 . The pump according to  claim 1  comprising an upper nut embedded in the ring and engaged with the upper threaded bolt. 
   
   
       10 . The pump according to  claim 1 , wherein the ring comprises a screw hole for receiving the upper threaded bolt. 
   
   
       11 . The pump according to  claim 1 , wherein the base comprises at least one recess for receiving the lower threaded bolt. 
   
   
       12 . The pump according to  claim 11  comprising at least one lower nut non-rotationally disposed in the recess and engaged with the lower threaded bolt. 
   
   
       13 . The pump according to  claim 12 , wherein the recess is a non-circular recess, and the lower nut is a non-circular nut disposed in the non-circular recess. 
   
   
       14 . The pump according to  claim 12 , wherein the lower elastic washer is disposed in the recess. 
   
   
       15 . The pump according to  claim 1  comprising a lower nut embedded in the base and engaged with the lower threaded bolt. 
   
   
       16 . The pump according to  claim 1 , wherein the base comprises a screw hole for receiving the lower threaded bolt. 
   
   
       17 . The pump according to  claim 1  comprising a handle connected to the rod.