Electromagnetic massage device for bathtub or pool

An electromagnetic massage device for a bathtub or pool, mounted in a bathtub or pool through a mounting hole in a wall of the bathtub or pool, comprising:

• an integrated holder configured to be fixed in the mounting hole in the wall of the bathtub or pool, wherein one end of the holder that enters into the wall of the bathtub or pool is called upper end, and the opposing end that comes out from the wall of the bathtub or pool is called lower end, wherein a concave cavity is formed in the opening of the upper end of the holder, the bottom of the concave cavity is a circular base plate, the center of the circular base plate extends inside to form a guide cavity, a ring cavity surrounding the guide cavity is formed between the circular base plate and the opening of the lower end of the holder, an edge of the concave cavity turns inside out to form a buckled side which is attached tightly against the internal surface of the wall of the bathtub or pool, and the peripheral wall of the lower end of the holder is provided with an external thread;
• a lock nut engaging to the external thread on the peripheral wall of the lower end of the holder, configured to fasten the lower end of the holder to the outside surface of the wall of the bathtub or pool;
• a rubber case, having a top portion that bulges outward and a bottom portion that is provided with a circular folded rim which is fit closely to the circular base plate of the concave cavity of the holder to seal the opening of the upper end of the holder;
• a conductive coil provided in a magnetic conductive shell of the ring cavity of the holder;
• and
• a beating head and an armature, both of which are fastened together and mounted in the guide cavity of the holder, wherein the beating head and armature are arranged to slide back and forth in the guide cavity under the action of the electromagnetic field caused by the conductive coil so that the beating head can slide into the concave cavity from the guide cavity and enter into the rubber case, or the beating head can enter into the guide cavity from the rubber case and return to the guide cavity.