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公开(公告)号：EP2660071B1
公开(公告)日：2018-04-04
申请号：EP11852860.3
申请日：2011-12-27
发明人： TAKAYAMA Kouichi , KAJIWARA Takumi
摘要： The present invention is a ballpoint pen tip in which a tip end portion of a tip body, which includes a ball holding chamber configured to hold a ball, an ink circulation hole formed in a center of a bottom wall of the ball holding chamber, and a plurality of ink circulation grooves extending radially from the ink circulation hole, is caulked inside, so that a part of the ball held in the ball holding chamber projects from a tip end edge and the ball is rotatably held, wherein: a curved contact surface, which has a curvature different from a curvature of the ball, is provided on the bottom wall of the ball holding chamber, and the ball is to be in contact with a contact part which is a part of the contact surface; and between the ball and the contact surface, a first gap is formed to extend from a side of the ink circulation hole up to the contact part such that the first gap gradually narrows from the side of the ink circulation hole, and a second gap is formed to extend from a distal side of an ink circulation groove up to the contact part such that the second gap gradually narrows from the distal side of the ink circulation groove.
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公开(公告)号：EP4245560A1
公开(公告)日：2023-09-20
申请号：EP21892021.3
申请日：2021-11-15
发明人： KAJIWARA Takumi , MASUSHIGE Naoto
IPC分类号： B43K1/08
摘要： The ballpoint pen tip (40) comprises: a ball (42) having a diameter of 0.5 mm or less; and a tip body (50) that holds the ball, wherein the tip body has a ball holding chamber (52) that holds the ball, a rear hole (57) located rearward of the ball holding chamber, an ink flow hole (62) that allows the ball holding chamber and the rear hole to communicate with each other, and an ink flow groove (64) extending in a radial direction (dr) from the ink flow hole, opening to the ball holding chamber, and not reaching the rear hole, a ratio (A/B) of an ink consumption A per 100 m of handwriting to a diameter B of the ball is 200 mg/mm or more and 800 mg/mm or less, and when a front end (64a) of the ink flow groove is set as a start point S1 and a position of 0.3 mm rearward from the front end (62a) of the ink flow hole is set as an end point S2, a volume of a first space (SA) in the ink flow hole and the ink flow groove from the start point to the end point is 0.02 mm 3 or more.
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公开(公告)号：EP3988322A1
公开(公告)日：2022-04-27
申请号：EP20827925.7
申请日：2020-06-17
摘要： A mechanical pencil (10) has: a shaft tube (20); a ferrule unit (30) supported by the shaft tube (20); a lead holding unit (40) having a chuck (41) configured to relatively move with respect to the ferrule unit (30) to eject lead (LE) held by the same; and an indication body (70) provided movably in an axial direction (AD). The indication body (70) delimits from rearward a lead storage space (S) formed rearward the chuck (41) in the shaft tube (20). The indication body (70) located at least at a predetermined position is viewable from outside the shaft tube (20). A length (LA) along the axial direction (AD) between a rear end of the lead storage space (S) and a front end of the ferrule unit (30), in a state where the indication body (70) has moved most rearward along the axial direction (AD), is equal to or more than twice a length (LX) of spare lead (SLE) to be stored in the lead storage space (S).
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公开(公告)号：EP2660071A1
公开(公告)日：2013-11-06
申请号：EP11852860.3
申请日：2011-12-27
发明人： TAKAYAMA Kouichi , KAJIWARA Takumi
摘要： The present invention is a ballpoint pen tip in which a tip end portion of a tip body, which includes a ball holding chamber configured to hold a ball, an ink circulation hole formed in a center of a bottom wall of the ball holding chamber, and a plurality of ink circulation grooves extending radially from the ink circulation hole, is caulked inside, so that a part of the ball held in the ball holding chamber projects from a tip end edge and the ball is rotatably held, wherein: a curved contact surface, which has a curvature different from a curvature of the ball, is provided on the bottom wall of the ball holding chamber, and the ball is to be in contact with a contact part which is a part of the contact surface; and between the ball and the contact surface, a first gap is formed to extend from a side of the ink circulation hole up to the contact part such that the first gap gradually narrows from the side of the ink circulation hole, and a second gap is formed to extend from a distal side of an ink circulation groove up to the contact part such that the second gap gradually narrows from the distal side of the ink circulation groove.
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