Bath tub lifter

A bath tub lifter for seniors or disabled persons for use with a bath tub, comprising:

• a frame to rest on a portion of the bath tub;
• a seat plate and a backrest in connection therewith;
• a lifting means for adjusting the height of the seat plate and the backrest between a lowermost and an uppermost end position, the lifting means comprising:
• a driving means mounted to the backrest, and
• a telescopic lifting tube to be actuated by the driving means;
• a spindle base in connection with the lifting tube for providing support against the frame;
• and
• an automatic lock-release device coupling the backrest and the seat plate above the lowermost end position and releasing the backrest from the seat plate in the lowermost end position such that the backrest is readily removable from the seat plate, the lock-release device comprising:
• at least one lock bolt movably held at the backrest for coupling the backrest and the seat plate above the lowermost end position, and
• at least one sliding guide formed at the seat plate for actuating the at least one lock bolt.