Easy-to-assemble air pump

Abstract

An easy-to-assemble air pump includes a cylinder, a piston member, a valve seat, and a valve connector. The piston member includes a piston portion and a rod portion integrally formed as a monolithic member. The piston portion is axially movably arranged into the cylinder, and the rod portion is movably coupled to the cylinder for movement with respect thereto. The valve seat is arranged in the cylinder. The valve connector is connected to one end of the cylinder. Thus, the assembly process of the air pump can be simplified and the assembly time can be shortened.

1 . An easy-to-assemble air pump comprising:
 a cylinder;   a piston member including a piston portion and a rod portion integrally formed as a monolithic member, wherein the piston portion is axially movably arranged into the cylinder, and wherein the rod portion is movably coupled to the cylinder for movement with respect thereto;   a valve seat arranged in the cylinder; and   a valve connector connected to one end of the cylinder.   
     
     
         2 . The easy-to-assemble air pump as claimed in  claim 1 , wherein the cylinder has a first through-hole penetrating a periphery of the cylinder, wherein the valve seat has a second through-hole aligning to the first through-hole, wherein the valve connector has a third through-hole aligning to the second through-hole, and wherein a first pin member inserts through the first through-hole, the second through-hole, and the third through-hole. 
     
     
         3 . The easy-to-assemble air pump as claimed in  claim 2 , wherein the first pin member has a communicating bore interconnected with the cylinder and the valve connector. 
     
     
         4 . The easy-to-assemble air pump as claimed in  claim 2 , further comprising: a handle and a second pin member, wherein one end of the cylinder opposite to the valve seat is provided with an end cap, wherein the rod portion has a pivotal end extending out of the end cap and a first pivotal hole provided at the pivotal end, wherein the handle has a second pivotal hole aligning to the first pivotal hole, and wherein the second pin member inserts through the first pivotal hole and the second pivotal hole, thereby pivotally connecting the handle to the pivotal end. 
     
     
         5 . The easy-to-assemble air pump as claimed in  claim 4 , wherein the end cap is threadedly mounted at one end of the cylinder opposite to the valve seat. 
     
     
         6 . The easy-to-assemble air pump as claimed in  claim 4 , wherein both of the rod portion and the handle are made of plastic material. 
     
     
         7 . The easy-to-assemble air pump as claimed in  claim 1 , wherein the rod portion is hollow and has a thickness greater than 0.6 mm. 
     
     
         8 . The easy-to-assemble air pump as claimed in  claim 1 , wherein the piston portion has a first outer diameter, wherein the rod portion further has a second outer diameter, and wherein the ratio of the second outer diameter to the first outer diameter is greater than 0.5.