Apparatus for keeping a spare car key in a fuel tank cap

An apparatus for keeping a spare car key in a fuel tank cap, comprising

• a cap provided on a lower surface thereof with downwardly protruding portions;
• a fixed body disposed under the cap, the fixed body having a pair of upstanding brackets with a fixed shaft therebetween, said fixed shaft carrying rotatably thereon plural axially disposed controllers each having a cylindrical segment shaped portion and triangular-shaped protrusions, a revolving ring being carried axially displaced on each said controller, each said revolving ring having triangular-shaped grooves formed in an inner wall thereof and having numbers around an exterior wall thereof, said fixed shaft having a protruding shaft portion formed at one end thereof, a spring being place around another end of the fixed shaft between one of said brackets and one of said controllers, a plate provided with holes therein for receiving lower portions of said revolving rings being provided under said fixed shaft, said plate having protruding portions inserted in slots of said brackets and jointing said plate therebetween, said plate being biased by a spring towards said fixed shaft, a control means being carried on the one end of the fixed shaft between the protruding shaft portion and one of said brackets, said control means being actuatable for axially displacing said fixed shaft for axially displacing said controllers thereon relative to said revolving rings;
• a revolving plate mounted to the underside of said cap and rotatable therewith, said fixed body being disposed between said cap and said revolving plate, said revolving plate having a central hole therein;
• a hooked control plate having a hooked portion and rotatably carried on an underside of said fixed body, said hooked control plate having a groove in a bottom thereof for receiving a screwdriver therein, said hooked control plate being movable for engaging a lower portion of said control means;
• a fixed plate having an upwardly extending cylindrical portion and a downwardly extending cylindrical portion, said revolving plate being mounted rotatably on said upwardly extending cylindrical portion of said fixed plate;
• a bar pivotably mounted on said revolving plate, said bar having a rod at one end thereof which rod has a slanting lower end, another end of said bar having a horizontally extending portion engageable by said plate of said fixed body, the lower end of said rod being inserted through a hole in said revolving plate and being insertable in a corresponding hole in said fixed plate, whereby in a first position of said bar the lower end of said rod protrudes into the hole in said fixed plate for preventing rotation of said revolving plate relative said fixed plate, and in a second position of said bar the lower end of said rod clears said hole in said fixed plate for permitting rotation of said revolving plate relative said fixed plate;
• and
• a ring-shaped cap member carried on the downwardly extending cylindrical portion of the fixed plate and having outwardly protruding portions for engaging a fuel tank filler neck.