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Automatic drafting device
| Details |
Inventors: Jozat, Walter;
Assignee: Koh-I-Noor Rapidograph, Inc. (Bloomsbury, NJ)
Primary Examiner: Miller, Jr.; George H.
Assistant Examiner:
Attorney, Agent or Firm: Semmes; David H.
Automatic drafting device of the type employing a tubular writing pen, particularly an adjustable sealing element which is used against the writing tip of the pen when the pen is in a retracted rest mode. The sealing element is laterally disengaged from the pen tip when the pen is an extended writing mode. The sealing element which may be in the form of an elastic spheroid prevents drying out of ink within the capillary channel when the pen is not in use. |
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DETAILED DESCRIPTION The invention deals with an automatic drafting device, having at least one tubular writing pen adjustably supported within a housing in both a raised or rest position wherein the tip of the writing pen is removed from a writing surface and a lowered or drawing position wherein the tip of the writing pen is in contact with the writing surface.
Many such automatic drafting devices are known (i.
e.
West German DT-OS No.
2,235,737), and it is possible to support more than one tubular pen within such a drafting device in order to have the capability of drawing varying line widths without the necessity for removing and inserting a different pen in the device.
Thus, with the presence of several tubular pens in the automatic drafting device, it is only necessary to advance one of the tubular pens into the drawing position, while the remaining tubular pens remain in the retracted or rest position.
As is the case with automatic drafting devices having a single tubular pen, as well as those having several tubular pens, there is the danger that the ink in the capillary tube of the tubular pen will dry out if, during a pause in the drawing operation or with the selection of another pen, an individual pen is maintained for an extended period of time in the retracted or rest position.
Such a drying out has as its consequence that upon lowering of the tubular pen into the drawing position, the pen will not immediately draw with full line width, thereby clearly hindering the automatic operation of the drafting device.
Therefore, there is a need for an automatic drawing device which will prevent the drying out of the ink in the capillary channel or writing tube.
In an automatic drafting device of the aforementioned type, this task will be fulfilled through a sealing-element which closes off and seals the writing tip of the pen when not in use.
In the lowered or drafting position of the tubular pen, this sealing-element preferably is tilted to one side in relation to the writing-tube, so that the drafting operation will not be hindered
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