Electric air pump

Abstract

An electric air pump includes a power unit and an inflating unit. The power unit includes a first housing and a motor. The inflating unit includes a second housing and an eccentric cam member. The power unit is configured to connect to the inflating unit in either a first position or a second position. When the power unit is in the first position, the motor is detached from the eccentric cam member. When the power unit is in the second position, the motor is connected to the eccentric cam member. When the power unit is in the third position, the power unit and the inflating unit are completely separated from each other.

1 . An electric air pump comprising:
 a power unit including a first housing, a battery disposed inside the first housing, a control circuit board electrically coupled to the battery, and a motor electrically coupled to the control circuit board; and   an inflating unit including a second housing, an eccentric cam member disposed inside the second housing, a linking member connected to the eccentric cam member, a piston arranged at one end of the linking member, a cylinder member accommodating the piston, and a connecting member arranged at one end of the cylinder member, wherein the eccentric cam member is detachably connected to the motor, and wherein the connecting member is adapted for connecting to an air valve;   wherein the power unit is configured to connect to the inflating unit in one of a first position, a second position, or a third position;   wherein when the power unit is in the first position, the motor is detached from the eccentric cam member;   wherein when the power unit is in the second position, the motor is connected to the eccentric cam member;   wherein when the power unit is in the third position, the power unit and the inflating unit are completely separated from each other.   
     
     
         2 . The electric air pump as claimed in  claim 1 , wherein the first housing extends along a first reference axis, wherein the second housing extends along a second reference axis;
 wherein when the power unit is in the first position, the first reference axis is coaxial with the second reference axis;   wherein when the power unit is in the second position, the first reference axis intersects with the second reference axis.   
     
     
         3 . The electric air pump as claimed in  claim 2 , wherein the power unit is provided with a first engaging portion on the first housing, wherein the inflating unit is provided with a second engaging portion on the second housing and a third engaging portion on the cylinder member;
 wherein when the power unit is in the first position, the first engaging portion is engaged with the second engaging portion;   wherein when the power unit is in the second position, the first engaging portion is engaged with the third engaging portion;   wherein when the power unit is in the third position, the first engaging portion is disengaged from both the second engaging portion and the third engaging portion.   
     
     
         4 . The electric air pump as claimed in  claim 3 , wherein the first engaging portion is formed on a first end face of the first housing and includes a pair of symmetrical first engaging protrusions, wherein each of the pair of first engaging protrusions has a first engaging slot on an outer side thereof, wherein the second engaging portion is formed on a second end face of the second housing and includes a pair of symmetrical second engaging protrusions, wherein the pair of second engaging protrusions is adjacent to a pair of symmetrical second engaging slots, wherein the third engaging portion is formed on an extension portion of the cylinder member and includes a pair of symmetrical third engaging protrusions, and wherein each of the pair of third engaging protrusions forms a third engaging slot on an outer side thereof;
 wherein when the power unit is in the first position, the pair of first engaging slots is engaged with the pair of second engaging protrusions;   wherein when the power unit is in the second position, the pair of first engaging slots is engaged with the pair of third engaging slots;   wherein when the power unit is in the third position, the pair of first engaging slots is disengaged from both the pair of second engaging protrusions and the pair of third engaging slots.   
     
     
         5 . The electric air pump as claimed in  claim 4 , wherein the pair of first engaging protrusions, the pair of second engaging protrusions, and the pair of third engaging protrusions are each curved in shape. 
     
     
         6 . The electric air pump as claimed in  claim 4 , wherein the first housing is provided with a first through-hole penetrating through the first end face along the first reference axis and disposed between the pair of first engaging protrusions, wherein the motor has a rotating shaft inserted into the first through-hole and a meshing member disposed at one end of the rotating shaft and disposed outside the first housing, wherein the second housing is provided with a second through-hole penetrating through the second end face along the second reference axis, a third end face adjacent to the second end face, and a third through-hole penetrating through the third end face, wherein the eccentric cam member is provided with a meshing groove detachably engaged with the meshing member;
 wherein when the power unit is in the first position, the meshing member extends into the second through-hole;   wherein when the power unit is in the second position, the meshing member extends into the third through-hole and engages with the meshing groove.   
     
     
         7 . The electric air pump as claimed in  claim 4 , wherein the eccentric cam member is provided with an eccentric connecting column, wherein one end of the linking member opposite to the piston has a connecting hole sleeved onto the eccentric connecting column, wherein the extension portion of the cylinder member forms a fourth through-hole corresponding to the third through-hole, and wherein the eccentric cam member is rotatably arranged in the fourth through-hole. 
     
     
         8 . The electric air pump as claimed in  claim 6 , wherein the piston is provided with a unidirectional sealing ring on an outer periphery thereof, wherein the cylinder member is further provided with a chamber extending along the second reference axis, and wherein the unidirectional sealing ring abuts against an inner surface of the chamber. 
     
     
         9 . The electric air pump as claimed in  claim 8 , wherein the cylinder member is further provided with a threaded hole communicating with the chamber, wherein the connecting member is provided with a threaded portion formed on an outer periphery thereof and detachably engaging with the threaded hole, and a connecting hole extending along the second reference axis, and wherein the connecting member is further provided with an airtight member disposed in the connecting hole and adapted for clamping the air valve. 
     
     
         10 . The electric air pump as claimed in  claim 1 , wherein the first housing is further provided with an aperture, wherein the control circuit board has an activation control button exposed outside the first housing through the aperture.