Ball point pen operating number display - has leaf for printing numbers contacting lower part of pushbutton

摘要

The number is selected automatically and displayed every time press operation is effected on ball point pen. Such a number is used during a game or for pedagogic use. Press button (1) on ball point pen is mounted on support (2) screwed to the cap (3). Lower part of button contacts tubular assembly (4) on which is supported the leaf on which figures are printed. The assembly is fixed to cylindrical support (6) by anchor blades which fit into slots. A helicoidal thread inside cylindrical support ensures rotation when shaft (13) locks against head (14) on pen cartridge control.