Massaging device for a chair with resilient straps

A massaging device for a chair having at least one resilient strap on the chair back, and the massaging device comprising:

• a massaging housing comprising:
• a front case having an inner surface and an outer surface, and the outer surface comprising;
• at least one strap groove formed on the outer surface and adapted to be connect to the at least one resilient strap of the chair;
• and
• two connecting grooves formed on the outer surface and respectively at two sides of each at least one strap groove on the outer surface of the front case adapted to securely hold the resilient strap in position;
• and
• a rear case attached to the front case and having an inner surface and a connecting device to connect the rear case to the inner surface of the front case;
• a vibration device received in the massaging housing and comprising;
• a motor with a protruding motor shaft, and the motor securely mounted in the massaging housing with means for holding the motor in the massaging housing;
• an offset flywheel attached to the protruding motor shaft;
• a massaging face attached to the front case and comprising:
• two opposite surfaces, where one surface is an inner surface and the other surface is an outer surface;
• the outer surface of the massaging face adapted to contact a human body, and the outer surface comprising:
• at least one massaging bulb formed on the outer surface;
• and
• the inner surface having an attaching device to attach the massaging face to the outer surface of the front case, and the inner surface comprising;
• at least one strap grooves formed on the inner surface and adapted to receive the at least one resilient strap of the chair in cooperation with the at least one strap groove in the front case;
• and
• two ribs formed on the inner surface, and engaging with the two connecting grooves on two sides of each at least one strap groove in the front case.