Patent ID: 8388251

Claim:
A writing instrument with a multivariate mechanical doll comprises of an elongated pen body having a seat mounted on an end thereof, a doll covers said seat, and a working piece engages with the seat to drive movement of doll; said working piece consists essentially of a shaft which attaches to the seat and slides within said pen body, a first driving element incorporated in the doll in response to the action of said shaft, a second driving element pin jointed to said first driving element and seat respectively, a third driving element pin jointed to said second driving element, and a plurality elastic elements incorporated in said body for providing reciprocal movement; said doll which composes of a frontal and a rear casing incorporates a decorating object pin jointed to said second driving element and is characterized in that: said seat includes a plate which attaches to the rear casing extended upwardly from a top thereof; a rail is provided at a frontal portion of said plate and a locating post is provided at a rear portion thereof; the locating post is sheathed by a spring and engages to a male junction piece; said junction piece connects to a female junction piece which fastened onto the frontal casing and engaged with the third driving element; said third driving element has a waving surface.