Claims
- 1. A writing instrument for a plotter, comprising:
- a hollow shaft of a synthetic resin and having a longitudinal axis;
- a pen tip holder injection molded of a synthetic resin and fitted into and fixed to a forward end of said shaft and having mounted therein a pen tip projecting forward therefrom along said longitudinal axis, and an ink tank at a rear end portion of said shaft;
- an injection molded temporary ink storage member made of a synthetic resin and non-threadedly housed in said shaft between said pen tip and said ink tank; and
- a mounting means on said hollow shaft consisting of a non-threaded flange portion integral with said shaft and positioned around the outer peripheral portion of said shaft at a position corresponding to said temporary ink storage member within said shaft, said flange portion extending radially outwardly from the outermost peripheral portion of said shaft and having two spaced radial surfaces for being engaged by the plotter in non-threaded engagement for mounting said writing instrument on the plotter, said surfaces having a radial dimension and being spaced for being firmly non-threadedly engaged between and held fixedly in the direction of the longitudinal axis by mounting pawls on the plotter, whereby the writing instrument can be mounted without the necessity for adjustment of its position in the direction of the longitudinal axis;
- said synthetic resin of said shaft being softer than said synthetic resin of said pen tip holder.
- 2. A writing instrument as claimed in claim 1 wherein said shaft is made of polypropylene and said pen tip holder is made of polyacetal.
- 3. A writing instrument as claimed in claim 1 wherein said forward end of said shaft has a front fixing portion having a shape for gripping said pen tip holder with a relatively great gripping force and a rear fixing portion having a shape for gripping said pen tip holder with a relatively small gripping force.
- 4. A writing instrument as claimed in claim 1, wherein
- said hollow shaft has an annular recess formed in an inner periphery thereof in radial alignment with said flange portion.
- 5. A writing instrument as claimed in claim 1, wherein
- said flange portion has a radially extending circumferential groove formed therein.
- 6. A writing instrument as claimed in claim 1, wherein
- said flange has an axially extending annular groove formed in each of said radial surfaces thereof.
- 7. A writing instrument as claimed in claim 6, wherein
- said annular grooves are formed at radially innermost portions of said radial surfaces, respectively.
- 8. A writing instrument for a plotter, comprising:
- a hollow shaft of a synthetic resin and having a longitudinal axis;
- a pen tip at a forward end of said shaft and concentric with said longitudinal axis and an ink tank at a rear end portion of said shaft;
- an injection molded temporary ink storage member made of a synthetic resin and non-threadedly housed in said shaft between said pen tip and said ink tank;
- a mounting means on said hollow shaft consisting of a non-threaded flange portion integral with said shaft and positioned around the outer peripheral portion of said shaft at a position corresponding to said temporary ink storage member within said shaft, said flange portion extending radially outwardly from the outermost peripheral portion of said shaft and having two spaced radial surfaces for being engaged by the plotter in non-threaded engagement for mounting said writing instrument on the plotter, said surfaces having a radial dimension and being spaced for being firmly non-threadedly engaged between and held fixedly in the direction of the longitudinal axis by mounting pawls on the plotter, whereby the writing instrument can be mounted without the necessity for adjustment of its position in the direction of the longitudinal axis; and
- wherein said hollow shaft has an annular recess formed in an inner peripheral thereof in radial alignment with said flange portion.
- 9. A writing instrument for a plotter, comprising:
- a hollow shaft of a synthetic resin and having a longitudinal axis;
- a pen tip at a forward end of said shaft and concentric with said longitudinal axis and an ink tank at a rear end portion of said shaft;
- an injection molded temporary ink storage member made of a synthetic resin and non-threadedly housed in said shaft between said pen tip and said ink tank;
- a mounting means on said hollow shaft consisting of a non-threaded flange portion integral with said shaft and positioned around the outer peripheral portion of said shaft at a position corresponding to said temporary ink storage member within said shaft, said flange portion extending radially outwardly from the outermost peripheral portion of said shaft and having two spaced radial surfaces for being engaged by the plotter in non-threaded engagement for mounting said writing instrument on the plotter, said surfaces having a radial dimension and being spaced for being firmly non-threadedly engaged between and held fixedly in the direction of the longitudinal axis by mounting pawls on the plotter, whereby the writing instrument can be mounted without the necessity for adjustment of its position in the direction of the longitudinal axis;
- wherein said flange has an axially extending annular groove formed in each of said radial surfaces thereof; and
- wherein said annular grooves are formed at radially innermost portions of said radial surfaces, respectively.
Priority Claims (5)
Number |
Date |
Country |
Kind |
1-115051 |
Sep 1989 |
JPX |
|
1-115437 |
Sep 1989 |
JPX |
|
1-139439 |
Nov 1989 |
JPX |
|
1-152382 |
Dec 1989 |
JPX |
|
2-45989 |
Apr 1990 |
JPX |
|
Parent Case Info
This is a continuing application of Ser. No. 07/678,322, filed Apr. 30, 1991, now U.S. Pat. No. 5,217,313.
US Referenced Citations (4)
Continuations (1)
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Number |
Date |
Country |
Parent |
678322 |
Apr 1991 |
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