Air pump for air mattress

Abstract

An air pump manually rotated to inflate and deflate an air mattress has a housing, a first and a second air vents mounted on the housing, an air valve selectively actuated to block or open the second air vent, and a mounting rack in the housing. The mounting rack is rotated so that a first or a second air compartment in the mounting rack is aligned with the second air vent, and the air valve is propped up by an undulant baffle on the mounting rack to switch to one of inflation, deflation and pressure hold-up modes. Given the structure of the air pump, the first and second air vents are flexibly arranged and can be respectively mounted on a top and a bottom of the housing and directly aligned with mutually. Therefore, the air path is shortened to make the inflation and deflation faster and more efficient.

1 . An air pump for an air mattress, comprising:
 a housing having   a chamber defined in the housing;   a first air vent mounted on a top of the housing, communicating with the chamber and adapted to be exposed beyond an air mattress; and   a second air vent mounted on a bottom of the housing, communicating with the chamber and adapted to communicate with the air mattress;   a rotary mounting rack pivotally mounted in the chamber and having   a first air compartment mounted to one end thereof;   a second air compartment communicating with the first air compartment through a first opening formed through a first partition between the first air compartment and the second air compartment, communicating with the first air vent through a second opening formed through a second partition of the second air compartment opposite to the first partition and abutting the first air vent;   an air outlet formed through a bottom of the first air compartment and directly aligned with the second air vent by rotating the mounting rack;   an air inlet circularly juxtaposed with the air outlet on the mounting rack with respect to a pivot axis of the mounting rack, and formed through a bottom of the second air compartment and directly aligned with the second air vent by rotating the mounting rack;   an undulant baffle formed thereon; and   a blocking plate pivotally mounted on a pivot shaft of the mounting rack, covered on the second opening when the mounting rack is rotated and the air inlet is aligned with the second air vent, uncovered on the second opening when the mounting rack is rotated and the air outlet is aligned with the second air vent;   a motor mounted inside the chamber and having an impeller mounted on a spindle thereof and located in the first air compartment; and   an air valve mounted at the second air vent propped up by the air flow generated by the motor and the impeller while inflating and by the undulant baffle while deflating to open the second air vent.   
     
     
         2 . The air pump as claimed in  claim 1 , wherein the first air vent and the second air vent are directly aligned with each other. 
     
     
         3 . The air pump as claimed in  claim 1 , wherein the first air compartment and the second air compartment are located between the first air vent and the second air vent. 
     
     
         4 . The air pump as claimed in  claim 1 , wherein a blocking plate is pivotally mounted on the pivot shaft of the mounting rack, when the mounting rack is rotated to align the air inlet to the second air vent, the blocking plate is covered on the second opening, and when the mounting rack is rotated to align the air outlet to the second air vent, the blocking plate is not covered on the second opening. 
     
     
         5 . The air pump as claimed in  claim 1 , wherein the undulant baffle has two wave crests and a wave trough. 
     
     
         6 . The air pump as claimed in  claim 1 , wherein the motor is fixedly mounted on the mounting rack and is synchronously rotated therewith. 
     
     
         7 . The air pump as claimed in  claim 1 , wherein the mounting rack has a grip mounted on the mounting rack and extended therefrom.