초록 ▼

A writing instrument having a closure cap assembly (1, 2, 3, 4 and 5) which can be placed in a sealing manner on the writing tip (20), whereby a positive engagement with an indentation in the writing tip is established via an elastically deformable finger (8), when the closure cap is in place on the

A writing instrument having a closure cap assembly (1, 2, 3, 4 and 5) which can be placed in a sealing manner on the writing tip (20), whereby a positive engagement with an indentation in the writing tip is established via an elastically deformable finger (8), when the closure cap is in place on the writing tip. On the inner face of the arm (8), oriented toward the writing tip (20), at least one cam face (13) is located in a chord plane of the circle forming the closure cap opening. Whereupon a twisting of the entire mounted closure cap assembly (1, 2, 3, 4 and 5) brings the cam face (13) into engagement with a correspondingly formed wedge face (27) of the writing tip (20), so that the arm (8) is pivoted radially outward, and the closure cap can be removed.

대표청구항 ▼

1. A writing instrument having a removable closure cap sealingly closing the writing tip, said cap comprising an axially extending sheath 1 with an insertion side defined by an opening substantially circular and a radially, elastically deformable, substantially axially extending finger 8 with a free

1. A writing instrument having a removable closure cap sealingly closing the writing tip, said cap comprising an axially extending sheath 1 with an insertion side defined by an opening substantially circular and a radially, elastically deformable, substantially axially extending finger 8 with a free end having a protrusion proximate its insertion side, so that when the closure cap is in the mounted position the protrusion is adapted to engage an indentation surrounding the writing instrument body and proximate the writing tip end, whereupon an annular shoulder of the writing tip normally located within the closure cap will be resiliently urged in sealing engagement with a sealing shoulder of the closure cap, characterized further in that said finger 8 is defined between two closely spaced, substantially axially extending notches 7 within the sheath, and an inner face of the finger (8), which is oriented toward said indentation when the closure cap (1, 2, 3, 4, 5) is in the mounted position, comprises a pair of planar cam faces (13), said cam faces being located normally substantially in intersecting chord planes of the circle defining the closure cap opening, which cam faces, upon a rotation of the mounted closure cap, being adapted to be brought into and out of engagement with at least one correspondingly-shaped wedge faces (27) on the writing tip body (20) as a result of the further face that at least a second group of at least two intersecting chord plane cam faces are defined within an inner face of said sheath at the same axial location as said cam faces 13, and a relative rotation of the sheath and instrument body causes said second group to be brought into and out of engagement with at least one other of correspondingly shaped wedge faces (27), whereby said second engagement radially deforms said finger 8 and releases said protrusion from said indentation, while displacing the longitudinal axes of said closure cap and said writing instrument. 2. A writing instrument as defined by claim 1, characterized in that on wedge faces (23, 24, 27 and 28) of the writing tip body have oppositely directed inclinations which are distributed over the entire circumference of the writing tip. 3. A writing instrument as defined by claim 2, characterized in that the oppositely inclined wedge faces (23, 24, 27 and 28) intersect with one another, defining tips (26) of the wedge faces which protrude beyond connecting areas between wedge faces inclined in opposite direction, said connecting areas being proximate the wedge face, at the end area located closer to the front end of the writing tip. 4. A writing instrument as defined by claim 3, characterized in that an area (14 and 15) proximate the intersection of each cam face (9, 10, 11 and 12) oriented toward the insertion side of the closure cap assembly (1, 2, 3, 4 and 5) is inclined toward the longitudinal axis, and extends radially inward from the insertion side toward the closure cap inner end and an area proximate the intersection of each wedge face, oriented toward the front end of the writing tip, is inclined toward the longitudinal axis, and extends radially outward from the writing tip body front end towards its rear end. 5. A writing instrument as defined by claim 2, characterized in that an area (14 and 15) proximate the intersection of each cam face (9, 10, 11 and 12) oriented toward the insertion side of the closure cap assembly (1, 2, 3, 4 and 5) is inclined toward the longitudinal axis, and extends radially inward from the insertion side toward the closure cap inner end, and an area proximate the intersection of each wedge face, oriented toward the front end of the writing tip, is inclined toward the longitudinal axis, and extends radially outward from the writing tip body front end towards its rear end. 6. A writing instrument as defined by claim 1, characterized in that the oppositely inclined wedge faces (23, 24, 27 and 28) intersect with one another, defining tips (26) of the wedge faces which protrude beyond connecting areas between wedge faces inclined in opposite direction, said connecting areas being proximate the wedge face, at the end area located closer to the front end of the writing tip. 7. A writing instrument as defined by claim 6, characterized in that an area (14 and 15) proximate the intersection of each cam face (9, 10, 11 and 12) oriented toward the insertion side of the closure cap assembly (1, 2, 3, 4 and 5) is inclined toward the longitudinal axis, and extends radially inward from the insertion side toward the closure cap inner end, and an area proximate the intersection of each wedge face, oriented toward the front end of the writing tip, is inclined toward the longitudinal axis, and extends radially outward from the writing tip body front end towards its rear end. 8. A writing instrument as defined by claim 1, characterized in that an area (14 and 15) proximate the intersection of each cam face (9, 10, 11 and 12) oriented toward the insertion side of the closure cap assembly (1, 2, 3, 4 and 5) is inclined toward the longitudinal axis, and extends radially inward from the insertion side toward the closure cap inner end. 9. A writing instrument as defined by claim 1, characterized in that an area proximate the intersection of each wedge face, oriented toward the front end of the writing tip, is inclined toward the longitudinal axis, and extends radially outward from the writing tip body front end towards its rear end.