Adjustment safeguard for an adjusting screw

An adjustment safeguard for two adjusting screws of a carburetor such as a membrane carburetor of a portable handheld work apparatus, the adjusting screws being rotatably held in a housing of the carburetor, the adjusting screws each having a head outside of the housing, the adjustment safeguard comprising:

• two caps defining respective longitudinal axes and being mounted on corresponding ones of the heads of said adjusting screws so as to be accessible to an operator for imparting a rotational movement thereto;
• holding means for holding each of said caps on the head corresponding thereto to prevent a rotation of the cap relative to the head and to permit the rotational movement to be transmitted to the corresponding adjusting screw;
• each of said caps having an appendage formed thereon;
• an apertured plate disposed between said caps and said housing and having through holes formed therein for corresponding ones of said adjusting screws;
• stop means fixedly provided on said apertured plate for coacting with said appendages of said caps to define and delimit respective rotational ranges through which said adjusting screws can be rotated;
• two sleeves connected to said caps respectively so as to be arranged approximately coaxially with the cap corresponding thereto and in radial surrounding relationship thereto;
• each of said sleeves and the cap corresponding thereto being mutually separated by a small radial clearance (r);
• each of said caps having a predetermined length measured along said axis;
• and,
• each of said caps being disposed along said length thereof essentially entirely within said sleeve corresponding thereto.

An adjustment safeguard for an adjusting screw rotatably held in a housing, the adjusting screw having a head outside of the housing, the adjustment safeguard comprising:

• a cap defining a longitudinal axis and being mounted on said head so as to be accessible to an operator for imparting a rotational movement thereto;
• holding means for holding said cap on said head to prevent a rotation of said cap relative to said head and to permit said rotational movement to be transmitted to said adjusting screw;
• said cap having an appendage formed thereon;
• stop means fixedly provided on said housing for coacting with said appendage of said cap to define and delimit a rotational range through which said adjusting screw can be rotated;
• a sleeve formed on said housing so as to extend upwardly therefrom so as to be arranged approximately coaxially with said cap and in radial surrounding relationship thereto;
• said sleeve and said cap being mutually separated by a small radial clearance (r);
• said cap having a predetermined length measured along said axis;
• and,
• said cap being disposed along said length thereof essentially entirely within said sleeve.