Writing device with at least two writing elements

Details Writing device with at least two writing elements Writing device with at least two writing elements

2000-01-27

2001-11-13

Eloshway, Charles R. (Department: 3751)

Coating implements with material supply

Plural tools including projectable and retractable tool

Selective individual projection by single actuator

C401S029000

Reexamination Certificate

active

06315477

ABSTRACT:

Such a writing device is described in EP 216 438 for example. In such writing devices it is relatively difficult to refill lead into the lead chamber at the back end of the lead insert. To this end the lead insert must be exposed and removed by removing, e.g. screwing off, one housing element from another, filled with lead and reinserted. In doing so the user often reassembles or uses the writing element incorrectly. Simple pencils with a retractable point with only one writing element insert on the other hand can be filled with lead from the top by removing a cap from the housing with the cap often serving as a retainer for an eraser. This makes the lead chamber of a pencil with a retractable point accessible for refilling purposes.
The object of the invention is to provide a writing device with at least two writing elements of which at least one is a lead insert and in which the filling of lead into the lead chamber of the lead insert is as simple and safe as in a writing device with only one writing element that serves as the lead insert. To a large extent this should be independent of the type of the mechanism that moves the lead from its stationary position in the housing to the writing position in which it protrudes from the housing. This can be a rotating mechanism, a push mechanism or a combination of both types of mechanism.
The object of the invention is attained in accordance with the invention by means of the characteristics of claim
1
.
The telescope type engagements of the lead chamber that is open on top with a cylinder tube that reaches to the back end of the writing device and is open at both ends, allows for the use of practically any known mechanism for activating the writing elements that are arranged in the housing, e.g. ballpoint pen refill cartridges, ink cartridges, color cartridges as well as at least one lead insert. The open back end of the cylinder tube is easily accessible from the top, for example by removing a cap in accordance with claim
2
, and can be filled with lead. It is substantial that due to the axially fixed cylinder tube it is possible to refill lead easily and safely not only when the lead insert is in the housed position inside the housing but also when the writing insert is extended to the writing position. The longitudinal shifts of lead chamber and cylinder tube that occur when the respective mechanism is operated are compensated by the telescope engagement. Only in the case of rotating mechanisms in which the respective operated writing inserts are rotated in circumferential direction of the housing, is it necessary to ensure a free rotational movement of the cylinder tube together with the writing insert that is aligned axially with it. Such an embodiment is protected in sub-claims
3
and
4
. Especially practical is the use of a known per se visual selection push mechanism according to claim
5
in which generally a pendulum or similar object is used for selecting the writing element that is to be extended.


REFERENCES:
patent: 4165941 (1979-08-01), Kageyama et al.
patent: 4202641 (1980-05-01), Tomura
patent: 4968167 (1990-11-01), Kageyama
patent: 0 216 438 A1 (1987-04-01), None

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