Multi-functional back brush

A multi-functional back brush comprising:

• a brush head having an upper portion provided with a strap, a front end formed with a first opening, a rear end formed with a second opening;
• an adjustable shaft having a first end engageable with said first and second openings of said brush head, said adjustable shaft having a second end which is circular in shape and provided with a center through hole, a circular toothed recess at one side thereof, and a plurality of radial partitions at another side thereof;
• an axle fitted through said center through hole of said adjustable shaft and having an end provided with a disk formed with a plurality of teeth engaged with said circular toothed recess;
• a cover engaged with said second end of said adjustable shaft;
• a handle having a circular end engaged with said second end of said adjustable shaft, said handle being provided with an elastic band having one end secured to an intermediate portion of said handle and another end extending through an opening close to another end of said handle, said elastic band having an opening at an end thereof;
• a toothed rack mounted on a bottom of said handle;
• an adjusting block movably engaged with said toothed rack and having a hook engaged with said hole of said elastic band;
• a T-shaped member fixedly mounted on said circular end of said handle and having a resilient blade engaged with said radial partitions of said adjustable shaft;
• a spring fitted within said circular end of said handle;
• an actuator arranged within said circular end of said handle and having one side bearing against said spring and provided with a plurality of radial protuberances;
• a cap threadedly engaged with said circular end of said handle and having a center opening and a plurality of longitudinal toothed grooves;
• and
• a pushbutton fitted within said cap and having one side bearing against another side of said actuator and provided with a plurality of teeth and radial projections.