Casing apparatus for an air pump

Abstract

A casing apparatus for an air pump has a body and a cap. The body has a housing and a combined portion. The housing is composed of a first semi-housing and a second semi-housing. The combined portion is axially formed on and is protruded from a front end of the housing. The cap is rotatably connected with the body and has an inwall a rotating connecter. The rotating connecter protrudes from the inwall and rotatably engages with the combined portion of the body. The cap is mounted on the front end of the housing and combines the first semi-housing with the second semi-housing without any separate securing device such as screws. To form screw holes in the housing is unnecessary. Therefore, the casing apparatus is easy to install and has a low cost.

What is claimed is: 
     
         1 . A casing apparatus for an air pump comprising:
 a body having:
 a housing being composed of a first semi-housing and a second semi-housing and having
 a chamber defined between the first semi-housing and the second semi-housing; 
 
 a sleeve portion axially formed on and protruded from a front end of the housing and having
 an air outlet defined through the sleeve portion and in communication with the chamber; and 
 
 a combined portion axially formed on and protruded from a front end of the sleeve portion; and 
   a cap rotatably connected with the body and having
 a rear end; 
 an inwall; 
 a chamber formed in the rear end of the cap and enclosed by the inwall; and 
 a rotating connecter protruding from the inwall at the rear end of the cap and rotatably engaged the combined portion of the body. 
   
     
     
         2 . The casing apparatus for an air pump as claimed in  claim 1 , wherein
 the combined portion has:
 an outer surface; 
 multiple engaging blocks spacedly mounted on the outer surface and each engaging block having
 an arm connected to the front end of the sleeve portion; 
 
 multiple engaging recesses defined between each engaging block and the front end of the sleeve portion respectively; and 
 multiple notches formed on the engaging blocks respectively and in communication with the engaging recesses respectively; and 
   the rotating connecter has multiple engaging protrusions and the engaging protrusions slipped into the engaging recesses of the combined portion respectively and engaged the engaging blocks of the combined portion respectively.   
     
     
         3 . The casing apparatus for an air pump as claimed in  claim 2 , wherein the cap has a column, and the column is hollow and is mounted on a rear surface of the cap and is inserted into the air outlet of the sleeve portion. 
     
     
         4 . The casing apparatus for an air pump as claimed in  claim 3 , wherein
 the body has:
 a connecting portion mounted on the rear end of the first semi-housing and having a keyway; and 
 a key mounted on and protruded from the rear end of the second semi-housing and inserted into the keyway of the connecting portion. 
   
     
     
         5 . The casing apparatus for an air pump as claimed in  claim 1 , wherein
 the body has:
 a connecting portion mounted on the rear end of the first semi-housing and having multiple keyways; and 
 multiple keys mounted on and protruded from the rear end of the second semi-housing and respectively inserted into the keyways of the connecting portion. 
   
     
     
         6 . The casing apparatus for an air pump as claimed in  claim 2 , wherein
 the body has:
 a connecting portion mounted on the rear end of the first semi-housing and having multiple keyways; and 
 multiple keys mounted on and protruded from the rear end of the second semi-housing and respectively inserted into the keyways of the connecting portion. 
   
     
     
         7 . The casing apparatus for an air pump as claimed in  claim 3 , wherein
 the body has:
 a connecting portion mounted on the rear end of the first semi-housing and having multiple keyways; and 
 multiple keys mounted on and protruded from the rear end of the second semi-housing and respectively inserted into the keyways of the connecting portion.