Head band for diagnostic instruments comprising light source and battery

A head band comprising

• a closed front support part for a diagnostic instrument having a light source;
• an open back support part having two opposite ends,
• a mechanism for adjusting and fixing the length of said head band and associated to said ends of said open back support part, said mechanism being arranged in a housing substantially adapted to a shape of a human head and having a shank extending through a wall of said housing and comprising a rotary knob;
• and
• an accumulator module which can be detachably mounted at said housing and has an opening for a passage of said shank and said rotary knob and to which a cable connection to said light source is associated;
• wherein
• said housing is a flat housing having two opposing rims, wherein two spaced-apart bayonet-type grooves are formed in each of said opposing rims of said flat housing and wherein said flat housing has a resilient spring protruding from an outer wall thereof;
• said opening in said accumulator module is a central, fully bordered opening having a shape which is adapted to the geometry of said rotary knob for operation thereof;
• said accumulator module has pins arranged for engagement within said grooves in said flat housing and for lateral shifting within said grooves such that said pins occupy a fixed position in said grooves;
• and
• said accumulator module has a recess for snap engagement with said resilient spring of said flat housing in a fixed position of said pins in said grooves.