Pen with ink injection system

Claim 2

A pen, comprising: a first ink reservoir, a second ink reservoir beneath said first ink reservoir, a pen tip in capillary communication with said second ink reservoir, venting means extending upwardly from a position near the bottom of said second reservoir to the atmosphere, at least one injection channel extending downwardly from said first reservoir to a position near the bottom of said second reservoir and of sufficient length to avoid capillary ink transport from said first reservoir to said second reservoir; and means to manually inject ink from said first reservoir to said second reservoir.

Claim 3

A pen as in claim 1, wherein said venting means comprises an ink buffer having a volume larger than that of the maximum increase in volume in said first reservoir under a temperature increase of 5* C.

Claim 4

A pen as in claim 1, wherein said venting means comprises an upwardly extending main venting channel of large lateral dimension avoiding capillary ink filling thereof.

Claim 5

A pen as in claim 3, wherein said venting means further comprises a plurality of capillary ink buffer channels in communication with said ink passage of said pen tip.

Claim 6

A pen as in claim 4 wherein said means to manually inject ink from said first reservoir to said second reservoir comprises a compressible wall defining said first reservoir and operable to move between a first normally expanded position and a second compressed position, means automatically returning said wall to said first position after being compressed, and means limiting said second compressed position to a position such that the total ink buffer capacity of said ink buffer channels in said second reservoir is larger than the maximum achieveable volume of ink injected into said second reservoir during a single injection.

Claim 7

A pen as in claim 5, including a holder, said venting means contained in said holder, said venting means further comprising a cross venting channel connecting a venting opening in the sidewall of said holder with said main venting channel, said ink buffer channels of said second reservoir being arranged so as not to terminate in said cross venting channel.

Claim 8

A pen as in claim 6, whereby at least part of said buffer channels include upwardly extending open sides in communication with said venting channel, and wherein said cross venting channel terminates into a section of said main venting channel that is not occupied by said ink buffer channels.

Claim 9

A pen as in claim 6, wherein at least part of said ink buffer channels are part of a capillary tampon structure.

Claim 10

A pen as in claim 6, whereby the lower end of said injection channel is contained within said holder, a central bearer is positioned within the ink passage of said pen tip, said bearer constituting the downward extension of said holder and extending downwardly beyond the lower end of said pen tip.

Claim 11

A pen as in claim 9, whereby the lower end of said pen tip comprises a flexible part of a flexible pen nib, and the lower end of said bearer is sidewardly displaceable with respect to said pen tip.

Claim 12

A pen as in claim 10, including at least one slit positioned within the lower end of said pen tip.

Claim 13

A pen as in claim 10, including a ball located in the bottom of said bearer, the lower end of said ball extending downwardly beyond the lower end of said pen tip.

Claim 14

A pen as in claim 6, including a protective cap provided with means for seaLing off said venting opening and said ink passage in said pen tip, the sidewall of said protective cap being provided with an opening located between said sealing off means so as to connect the interior of said cap with the atmosphere, the interior of said cap between said sealing off means having a greater diameter than the corresponding outside of said pen.