Coating implements with material supply – Including means to apply material-moving force – Intercommunicable reservoirs or reservoir sections in series
Reexamination Certificate
1999-07-20
2001-06-26
Eloshway, Charles R. (Department: 3751)
Coating implements with material supply
Including means to apply material-moving force
Intercommunicable reservoirs or reservoir sections in series
C401S230000
Reexamination Certificate
active
06250832
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The problem with fountain-pens has always been that they are prone to ink leaks as a result of changes in pressure and/or temperature. These changes occur when there is a drop in pressure in mountainous areas or on airplanes, or when passing from low temperatures to high temperatures. These changes cause the air contained in the reservoir to expand which results in a corresponding quantity of ink leaking out through the nib, if the latter is pointing downward; the greater the change in pressure, the more ink leaks out. Also, the more air is contained in the reservoir, the more ink will leak out through the nib.
In the fountain-pen's one-hundred-year-plus history, this problem has only partially been solved by attaching fins to the ink-conveying member. The purpose of these fins, which can be seen underneath the nib of any fountain-pen, is to trap small leaks and prevent them from flooding into the cap. The limitations of such a system are that the fins have a limited capacity and work effectively only with very small reservoirs, such as for example a cartridge (capacity of approx. 0.8 cc). With a reservoir of approximately 3 cc the usefulness of the fins is very limited. This problem means that the writing span of fountain-pens currently available is very short, given an average reservoir capacity of approximately 1 cc.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the invention is to enable the pen to be filled with any quantity of ink, the volume of ink depending only on the dimensions of the pen and the plunger, while still preventing ink leaks.
These and other objects and advantages will become apparent from the following text.
According to the invention, the fountain-pen—which has a reservoir for the ink together with means for filling it - comprises a smaller supply reservoir which is adjacent to and supplies the nib, and a manually operated valve which hermetically closes and opens the passage between the abovementioned reserve reservoir and the supply reservoir; by operating the valve ink can be transferred from said reserve reservoir to said supply reservoir.
A fountain-pen can be of the type comprising a piston type valve which slides along the wall of said reservoir and is attached to a rod which extends outside the pen, passing through a sealing bush, and is fixed to an end piece for manually operating said piston type valve so as to fill the pen by means of suction. In this case the piston type valve also constitutes said valve for closing and opening the passage between the two reservoirs; said valve engages in a seat formed by a component which delimits said supply reservoir.
Said component which delimits said supply reservoir is advantageously transparent and allows the amount of ink in said supply reservoir to be visible.
Said piston type valve may be able to move to a limited degree on the rod, between two limits, so that engagement of shaped parts opens or closes a passage between the valve and the rod.
The end piece that operates the valve can be screwed onto the body of the reserve reservoir until it reaches a position in which it shuts off the passage between the valve and the rod and in which said piston type valve bears in a leaktight manner against its seat.
A better understanding of the invention will be gained by reading the description and examining the appended drawing which shows a non-limiting practical example of said invention. In the drawing:
REFERENCES:
patent: 605035 (1898-05-01), Weeks
patent: 940909 (1909-11-01), Vogelmann
patent: 2070461 (1937-02-01), Watanabe
patent: 2142532 (1939-01-01), Stenersen
patent: 2336028 (1943-12-01), Nichol
patent: 2509465 (1950-05-01), Wing
patent: 2737329 (1956-03-01), Bolsey
patent: 3083690 (1963-04-01), Marban
Eloshway Charles R.
McGlew and Tuttle , P.C.
Visconti S.R.L.
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