Rotary pencil
AssigneeFaber-Castell AG
InventorSTEFAN HORNFECK
Life of this patent
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Abstract
A rotary pencil includes a sleeve-shaped shaft having a front end and a rear end, a threaded spindle mounted to be fixed against rotation and axially movable in said shaft and having an at least single-start external thread. At least one threaded element is fixed in axial and rotating directions relative to the shaft and engages into the external thread. The front end of the external thread is adjoined by a cylindrical spindle section which extends over the entire circumference of the spindle, namely a free-running section, and has an external diameter corresponding to a core diameter of the external thread.
Claims3
A rotary pencil, comprising:
- a sleeve-shaped shaft having a front end and a rear end;
- a threaded spindle mounted to be fixed against rotation and axially movable in said shaft, said threaded spindle having a circumference and an at least single-start external thread with a core diameter;
- at least one threaded element being fixed in axial and rotary directions relative to said shaft, said at least one threaded element engaging into said external thread;
- and
- a cylindrical spindle section adjoining said front end of said external thread and extending entirely over said circumference of said spindle, said cylindrical spindle section being a free-running section having an external diameter corresponding to said core diameter of said external thread.
Dependencies are inferred from the claim text.