| 摘要 |
A press-out type writing tool having a holder body and a mechanism disposed in the holder body for pressing out pencil lead. The mechanism includes a depressing tube, a chuck for clamping the lead and a lead clamp. The lead clamp is formed separately from the chuck and is adapted to come in and out of an end opening of the holder body, while clamping the lead. The lead clamp projects out of the lower opening of the holder body, when the tool is used for the writing purpose, and is adapted to make up the required projection length of the lead as the latter wears. When the tool is not used, the lead clamp is retracted to disappear into the holder body, along with the lead which is clamped by the lead clamp, so as to protect the lead against any external force which may incur the breakage of the lead. The upper end of the lead clamp in the retracted state is received by an enlarged hole formed in the lower end of the chuck, so as to make the chuck release the lead. Since the lead in this state is clamped solely by the lead clamp, breakage of the lead attributable to a too strong gripping by the chuck is avoided. The condition of holding of the enlarged portion of the lead clamp by the chuck is never changed by any external force or impact applied to the holder body. The number of parts constituting the lead clamp is reduced to simplify the construction and to facilitate the assembling, thereby to ensure a trouble-free and stable use of the writing tool.
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