Coating implements with material supply – Material flows through porous tool – With removable cap for tool
Patent
1990-01-26
1991-10-08
Bratlie, Steven A.
Coating implements with material supply
Material flows through porous tool
With removable cap for tool
401213, 401243, B43K 900
Patent
active
050549499
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to a cap for writing implements, especially for ball point pens, however also for other writing-, drawing, or painting appliances, wherein the cap comprises at least one air channel penetrating the front end.
Such caps are known from the EP-OS 204 252 (A1). These known caps however always consist of several inserted parts and/or parts which are axially movable against each other and are therefore always costly and usually involve complicated fabrication.
Additionally, these known caps do not assure a reliable, always present air circulation, when the cap is separated from the writing-, drawing- or the painting implement. The air channel in the end wall can and is to be sealed especially by the axially mobile inner seal.
SUMMARY OF THE INVENTION
Therefore, it is the task of the present invention to create a simple and economically fabricatable cap for writing implements of all types, which reliably protects against soiling one's clothes, as well as protecting against damage to the writing tip and which in spite of that provides continuous air circulation, if it is not connected with the writing implement.
Pursuant to this task, one aspect of the present invention resides in providing an air channel exclusively in the region of the otherwise closed end of the cap. The air channel being bounded by a baffle wall formed by a disk and a step as part of the front wall of the cap. Also, the baffle wall, front wall and cap wall are all formed as one piece and rigidly connected together.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained with particularity with the help of the drawings and several represented examples. Herein it is shown on:
FIG. 1 a first embodiment partially presented in section along the line A--A in FIG. 3,
FIG. 2 a side view of the cap in FIG. 1,
FIG. 3 a plan view of the cap in FIGS. 1 and 2,
FIG. 4 a second embodiment presented in section along the line B--B in FIG. 6,
FIG. 5 a side view of the cap in FIG. 4,
FIG. 6 a plan view of the cap in FIGS. 4 and 5 and
FIG. 7 a third variant with integrated inner seal shown in section.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The cap 1 depicted in FIGS. 1 to 3 is designed in one piece and comprises a molded-on clip 10. The closed front face 2 is provided with two semicircular axially extending segments 4' of a continuous air channel 4 penetrating through the front wall 3. Herein simultaneously a disk 5' held by webs 6 is formed by way of a baffle wall 5 effective from the inside. With cooperation of radial apertures 4"' and an additional axial segment 4", the air channel 4 becomes a through channel and discharges into the inside space 7 of the cap 1.
An annularly shaped cirumferential step 5", serving as a transversely extending baffle wall 5, causes a redirection of the air flow as well as secure protection of the writing tip 11, which in this case contains a writing ball 12, from damage by foreign bodies axially penetrating into the cap 1.
Apart from that, the step 5' prevents for instance tissue particles of pieces of clothes from penetrating far into the cap and thus establish contact with and foul the writing tip 11 or the writing ball 12.
The shaft 14 of the writing implement and the cap 4 are connected with each other by an annular bead 15 molded to the cap wall 8 in a positively locking or frictionally locking fixed manner, but so as to be axially detachable.
The essentially axially and radially offset axial segments 4' and 4" of the air channel 4 and the axially adjacent steps 5" and/or disks 5' serving as baffle walls 5 are in an expedient way shaped so, that they essentially have respectively an identical or nearly identical cross-section.
This facilitates or enables to removal of the caps from the mold in an axial direction; these caps are as a rule manufactured from thermoplastic plastics material using the injection molding process. In order to fasten or secure the disks 5' serving as baffle walls 5, the disks 5' are connected with the front wall 3 and/or t
REFERENCES:
patent: 4844642 (1989-07-01), Inaba et al.
Bratlie Steven A.
J.S. Staedtler GmbH & Co.
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