Coating implements with material supply – Plural tools including projectable and retractable tool – Single actuator for simultaneous projection of one tool and...
Reexamination Certificate
2000-10-24
2001-09-18
Walczak, David J. (Department: 3751)
Coating implements with material supply
Plural tools including projectable and retractable tool
Single actuator for simultaneous projection of one tool and...
C401S032000
Reexamination Certificate
active
06290413
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a writing instrument, and more particularly to a writing instrument that has at least one changeable writing implement. The changeable writing implement may be a colored pencil, a crayon or an eraser stick.
2. Description of Related Art
A child frequently uses a crayon to draw. A conventional crayon is a stick of colored wax with a paper cover on the outside crayon to prevent the crayon from getting the user's hand dirty. The user must tear off the paper on the crayon to expose the crayon after it has been used for a period of time.
However, the crayon is soft and only covered by a piece of paper so the crayon is easily broken during use. The length of exposed crayon is difficult to control especially when a child tears the paper off of the crayon. Sometimes the exposed section of crayon is too long and sometimes too short, which makes using the conventional crayon very inconvenient. Furthermore, as the crayon becomes shorter and is hard for the user to hold, the short crayon will be thrown out so that the crayon cannot be completely used.
Consequently, to overcome the disadvantages of the conventional crayon, the conventional crayon was covered by a tube of paper to prevent the conventional crayon from breaking during use. The roll of paper can be torn off in segments to control the exposed length of the crayon, but the crayon still cannot be completely used.
The present invention has arisen to mitigate and/or obviate the disadvantages of the conventional crayon.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, a writing instrument includes a hollow barrel having a longitudinal slot defined in the barrel and extending through the barrel. A series of continual corresponding indentations are formed on each side of the slot. A connecting device is slidably mounted in the barrel. A thrust device is mounted on the periphery of the barrel to drive the connecting device. A connector is attached to each end of the connecting device to attach a crayon, a colored pencil or an eraser.
REFERENCES:
patent: 1679382 (1928-08-01), Sjobring
patent: 2710614 (1955-06-01), Dulberg
patent: 5577850 (1996-11-01), Mishima
Hedman & Costigan ,P.C.
Nguyen Tuan
Walczak David J.
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