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US 12,220,938 B2Granted
Ball point tip and writing instrument fitted with such a ball point tip
AssigneeSociete BIC
InventorJean-Baptiste Boura
Life of this patent
Estimating the term…
Abstract
A ball point tip comprising a ball holder having an ink conduit and a ball house, a ball accommodated into the ball house and a leaf spring axially disposed between the ball and an axial end of the ink conduit, the leaf spring having a main body and a plurality of tongues extending radially from the main body, ink passages being formed between the tongues in order to fluidly connect the ink conduit and the ball house, wherein the ball holder and the leaf spring are made of plastic and unitary formed.
Claims20
A ball point tip comprising:
- a ball holder having an ink conduit and a ball house, the ink conduit extending axially and comprising a first axial end, a second axial end, and opening into the ball house, the ball house including a stop, and a ball accommodated into the ball house,
- a leaf spring axially disposed between the ball and the second axial end of the ink conduit, the leaf spring having a main body and a plurality of tongues extending radially from the main body, ink passages being formed between the plurality of tongues in order to fluidly connect the ink conduit and the ball house;
- a shoulder axially disposed between the first axial end of the ink conduit and the leaf spring;
- and
- an annular reinforcement filet is axially disposed between the first axial end of the ink conduit and the shoulder,
- wherein the stop has a frustoconical shape and is disposed radially between a wall of the ball house and the leaf spring,
- wherein the ball holder and the leaf spring are made of plastic and form together a single piece.
4 more elements
A ball point tip comprising:
- a ball holder having an ink conduit and a ball house, the ink conduit defined by a wall and extending axially, comprising a first axial end and a second axial end, and opening into the ball house;
- a ball accommodated into the ball house;
- a leaf spring axially disposed between the ball and the second axial end of the ink conduit, the leaf spring having a main body and a plurality of tongues extending radially from the main body, ink passages being formed between the plurality of tongues in order to fluidly connect the ink conduit and the ball house;
- a reinforcement extending from the wall of the ink conduit, along the plurality of tongues, to the main body of the leaf spring, wherein the reinforcement tapers radially-inwardly toward a central longitudinal axis that is co-axial with the main body of the leaf spring, in a direction from the first axial end toward the second axial end;
- a shoulder axially disposed between the first axial end of the ink conduit and the leaf spring;
- an annular reinforcement filet is axially disposed between the first axial end of the ink conduit and the shoulder,
- wherein the ball holder and the leaf spring are made of plastic and form together a single piece.
4 more elements
A writing instrument comprising:
- a ball point tip comprising a ball holder having an ink conduit and a ball house, the ink conduit extending axially and comprising a first axial end and a second axial end, wherein the ink conduit opens into the ball house, the ball house including a cylindrical wall and a stop that is formed of a frustoconical shape that tapers radially-inwardly in a direction from the second axial end toward the first axial end, and a ball accommodated inside the ball house;
- a leaf spring having a main body and a plurality of tongues in order to fluidly connect the ink conduit and the ball house;
- and
- a reservoir configured to feed the ball point tip with ink, the reservoir comprising gel ink;
- a shoulder axially disposed between the first axial end of the ink conduit and the leaf spring;
- and
- an annular reinforcement filet axially disposed between the first axial end of the ink conduit and the shoulder,
- wherein the ball holder and the leaf spring are made of plastic and form together a single piece.
5 more elements
Dependencies are inferred from the claim text.