Air pump having an adjustable interval between an electromagnetic device and an air chamber

Abstract

An air pump having an adjustable interval between an electromagnetic device and an air chamber includes at least a upper cap, a base, an electromagnetic device, an air chamber and a regulator. The regulator has a rotary knob to drive a bolt and move a coupling member up and down. The coupling member has struts at two sides to force a guiding slot of a coupling seat to move thereby to drive the electromagnetic device to move forwards and rearwards for adjustment. As a result the moving frequency of the crank in the air chamber can be altered to adjust the air supply amount being delivered.

1 . An air pump having an adjustable interval between an electromagnetic device and an air chamber, comprising at least a upper cap, a base, an electromagnetic device, an air chamber and a regulator; wherein:
 the upper cap has an opening and a housing space inside;   the base mates and is coupled with the upper cap;   the electromagnetic device generates magnetism when energized by electricity;   the air chamber is held in a dock which has at least one crank, the crank having a magnet at one end and a fastening end at another end to be fastened to an axle seat, the crank having a middle section coupling with a rubber cap which is coupled on an outer side of the dock; and   the regulator includes a bolt, a coupling member, a coupling seat and a rotary knob; the bolt having a upper section coupling with an axle hole formed on the rotary knob, a middle section having an external screw thread formed thereon to be screwed with an internal screw thread formed in the coupling member, the coupling member having two struts at two sides that are held in a guiding slot of two bracing arms of the coupling seat, the coupling seat having a front side coupling with a lateral side of the electromagnetic device.   
   
   
       2 . The air pump of  claim 1 , wherein the base has a first housing chamber to hold the air chamber. 
   
   
       3 . The air pump of  claim 1 , wherein the base has a second housing chamber to hold the electromagnetic device. 
   
   
       4 . The air pump of  claim 1 , wherein the base has a third housing chamber to hold the regulator. 
   
   
       5 . The air pump of  claim 1 , wherein the electromagnetic device has a positioning hole at the lateral side to receive a pin to couple with the coupling seat.