Fountain pen
OwnerOtto Mutschlerinventor
Life of this patent
Estimating the term…
Abstract
The cap of a fountain pen is releasably locked to the barrel by spherically arcuate projections in the bore of the cap engaging a groove in the barrel which is bounded by a circumferential sealing rib on the barrel in a direction inward of the cap when the latter is in the closed position. Three, equiangularly distributed, axial ribs in the cap guide the barrel during insertion of the barrel into the cap and bound capillary ducts in the assembled pen which collect condensate from the air chamber surrounding the nib and prevent contamination of the condensate with coloring matter from the ink. The sealing rib on the barrel engages a cylindrical face portion of the cap between the projections and the outer ends of the guide ribs.
Claims10
A writing implement comprising:
- a. an elongated barrel having a longitudinal axis and formed with a cavity adapted to contain ink;
- b. a writing tool projecting from one axially terminal portion of said barrel and communicating with said cavity for dispensing said ink;
- c. an elongated cap having a longitudinal axis and formed with an axial bore open in one axial direction and closed in the other axial direction,
- 1. said bore being dimensioned for relative coaxial translatory movement of said cap and of said barrel toward and away from a closed position in which said writing tool is received in said bore,
- 2. said writing tool and said cap in said position bounding an air chamber separating said tool in said bore from said cap in said other axial direction and in all radial directions;
- d. three circumferentially spaced, axially elongated guide ribs projecting from said cap in said bore and radially engaging said barrel in said closed position;
- e. a plurality of circumferentially spaced radial projections on said cap in said bore adjacent the axially open end of said bore;
- and
- f. an annular sealing rib projecting from said barrel in a radial plane, the barrel being formed with a circumferential annular groove offset from said sealing rib in an axial direction away from said writing tool,
- 1. said projections and said guide ribs axially bounding therebetween an annular face portion of said cap in said bore, said face portion being of circular cross section,
- 2. said sealing rib sealingly engaging said face portion in said closed position.
Dependencies are inferred from the claim text.