US3904297A - Socket for holding the writing ball of a ball-point pen - Google Patents

Socket for holding the writing ball of a ball-point pen Download PDF

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Publication number
US3904297A
US3904297A US480516A US48051674A US3904297A US 3904297 A US3904297 A US 3904297A US 480516 A US480516 A US 480516A US 48051674 A US48051674 A US 48051674A US 3904297 A US3904297 A US 3904297A
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US
United States
Prior art keywords
tubular member
ink
ball
rod
forward end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US480516A
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English (en)
Inventor
Jiro Hori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sailor Pen Co Ltd
Original Assignee
Sailor Pen Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sailor Pen Co Ltd filed Critical Sailor Pen Co Ltd
Application granted granted Critical
Publication of US3904297A publication Critical patent/US3904297A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K1/00—Nibs; Writing-points
    • B43K1/08—Nibs; Writing-points with ball points; Balls or ball beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00—Ball-point pens
    • B43K7/10—Arrangements for feeding ink to the ball points
    • B43K7/105—Feed bars

Definitions

  • a socket for holding the writing ball of a ball-point pen comprises a tubular member having a tip portion formed to hold a writing ball, a rod inserted into the tubular member to receive the ball in a seat provided at the forward end thereof, ink passages formed be tween the tubular member and the rod, and grooved ink outlets circumferentially provided in the inner walls of the tip portion of the tubular member to communicate with the ink passages and the outside of the socket, whereby aqueous ink filled in the ink passages is supplied through the ink outlets to the portion of the ball which is exposed to the outside of the socket.
  • This invention relates to a socket for holding the writing ball of a boll-point pen and more particularly to a socket adapted for application of aqueous ink.
  • the socket of the prior art ball-point pen comprises a tubular member and a rod received therein.
  • a writing ball is rotatably held in the tip portion of the tubular member.
  • the prior art ball-point pen is accompanied with the various drawbacks that the writing ball is likely to be displaced from its normal position in the tip portion, causing ink to be poured out unevenly; unpleasant noises arise during writing by the rubbing of the rotating ball against the inner wall of the tip portion of the tubular member and the forward end portion of the rod, possibly with the resultant wear of the ball; and the large clearance gives rise to the fall of the ball off the interior of tip portion of the tubsitor member.
  • a further disadvantage of the prior art ball-point pen is that where the very viscous ink is replaced by an aqueous type of lower viscosity, the wide clearance leads to an unduly large discharge of the aqueous ink, making the ballpoint pen unavailable for practical use. Though an attempt may be made to narrow the clearance in order to avoid such drawback, the undue restriction of the clearance will considerably decrease the delivery on ink. Moreover, in formation of the the tip portion of the tubular member, it is very difficult to effect a fine adjustment of the clearance.
  • a socket for holding the writing ball of a ball-point pen which comprises a tubular member having an opening of generally rectangular cross section formed therein so as to extend along the tubular member and surround the writing ball at the forward end portion thereof, a generally conical tip portion formed at the forward end of the tubular member so as to retain the writing ball in the reduced portion of the generally conical tip portion, generally triangular ink outlets formed in the inner walls of the tip portion and extending along the tip portion so as to communicate with the outside of the socket at the forward end thereof and with the corresponding corners of the rectangular hole at the rear end thereof, and a rod inserted into the tubular member to receive the writing ball at the forward end thereof; and at least one ink passage extending lengthwise of the tubular member and formed between the inner walls of the tubular member and the outer wall of the rod so as to communicate with the ink outlets.
  • ink is delivered on the surface of, for example, a sheet of paper from the ink duct means under a very stable condition mainly through the ink outlets, instead of through a clearance between the inner wall of the tubular member and ball as is the case with the prior art ball-point pen.
  • FIG. 1 is a longitudinal sectional view of a socket according to an embodiment of this invention for holding the writing ball of a ball-point pen;
  • FIG. 2 is a front view of FIG. 1;
  • FIG. 3 is a sectional view on line 33 of FIG. 1;
  • FIG. 4 is a longitudinal sectional view of a socket according to another embodiment of the invention for holding the writing ball of a ballpoint pen;
  • FIG. 5 is a front view of FIG. 4;
  • FIG. 6 is a sectional view on line 6-6 of FIG. 4;
  • FIG. 7 is a sectional view on line 7-7 of FIG. 4.
  • a socket 10 comprises a tubular member 11 and a round rod 12 received therein.
  • the tubular member 11 is provided inside with a hole 13 having a generally square or rectangular cross section and lengthwise penetrating the tubular member 11.
  • the round rod 12 is forcefully inserted into the square hole 13.
  • a steel writing ball 14 is inserted into the tubular member 11 at the front end thereof so as to have part of the ball 14 exposed to the outside from the opening of the socket l0.
  • Formed at the forward end of the round rod 12 is a concave ball seat 16 having shape complementary to the peripheral outline of the ball 14 so as to support the ball 14.
  • the tip portion 15 of the tubular member 11 is deformed as illustrated in FIGS. 1 and 2.
  • the front inner edge 17 of the tip portion 15 has its cross section changed by deforming same (i.e., by application of pressure) from the previous square form into a circular one for contact with the ball 14.
  • those portions of the internally square tubular member 11 which constituted, before forming the tip portion, the four comers 13a of the hole 13 lengthwise penetrating the tubular member 11 are left intact to form four ink outlets 20 having a generally triangular cross section.
  • the generally triangular ink outlets 20 are provided between the inner walls 15a of the tip portion 15 and the outer peripheral surface of the ball 14 so as to be distributed equidistantly in the circumferential direction of said ball 14.
  • the ball 14 is rotatably held between the formed conical tip portion 15 of the tubular member 11 and the concave ball seat 16 of the rod 12.
  • ink duct means or ink passages 18 Spaces allowed between the inner wall of the tubular member 11 (namely, the inner wall 13b of the penetrating hole 13) and the outer periphery 12a of the round rod 12 constitute ink duct means or ink passages 18 being filled with aqueous ink 19.
  • ink passages 18 communicate with an ink cartridge (not shown) connected to the opposite end of the tubular member 11 to the tip portion 15 so as to receive ink delivered from the cartridge.
  • the flat end face 21 of the rod 12 and the peripheral surface of the ball 14 define ink reservoirs 22.
  • the reservoirs 22 enable the peripheral surface of the ball 14 to be always wetted with the ink 19.
  • ink 19 Delivery of ink 19 from the ink cartridge (not shown) to the ink passages 18, and thence to the ink reservoirs 22 and ink outlets 20 is effected by capillary action.
  • ink outlets 20 have a proper size, then ink 19 can be supplied in an adequate amount to a point of contact between the ball 14 and the paper surface.
  • a socket 110 comprises a tubular member 111 bored with a lengthwise extending hole having a circular cross section and a rod 112 having a circular cross section and having its outer periphery closely contacting the inner wall 1110 of the tubular member 111.
  • a square hole 113 is formed, as shown in FIGS. 4 and 7, in the forward portion 123 of the tubular member 111.
  • the tip portion 115 of the tubular member 111 is formed like the tip portion of FIGS. 1 to 3.
  • a steel writing ball 114 is supported by the inner wall 1150 of the tip portion 115 and a concave ball seat 116 formed in the forward end of the rod 112.
  • the front inner edge 117 of the tip portion 115 contacts the peripheral surface of the ball 114 like the edge 17 of the preceding embodiment.
  • Those portions of the square hole 113 which are defined by the inner wall 123a of the forward end portion 123 and the peripheral surface of the ball 114 play the part of ink outlets 120.
  • Those portions of the ink outlets 120 which are disposed in the tip portion 1 15 have the same shape and function as the ink outlets of the preceding embodiment.
  • the flat forward end face 121 of the rod 112 and the outer peripheral surface of the ball 114 jointly define ink reservoirs 122 for wetting the peripheral surface of the ball 114 with aqueous ink.
  • the rod 112 is provided with a groove 124 extending lengthwise throughout the rod 112.
  • This long groove 124 and the inner wall 1 1 1a of the tubular member 1 1 1 jointly define an ink duct means or passage 118 being filled with aqueous ink 119.
  • the ink passage 118 is open at one end to the ink outlets 120 and ink reservoirs 122 and at the opposite end open to the interior of an ink cartridge (not shown).
  • the ink passage 118 has exactly the same function as the ink passages 18 of the preceding embodiment.
  • the socket according to the embodiment of FIGS. 4 to 7 is operated in substantially the same manner as the socket 10 according to the embodiment of FIGS. 1 to 3, description thereof being omitted by way of avoiding duplication.
  • Provision of the ink outlets 20, in the foregoing two embodiments respectively enables a clearance between the writing balls 14, 114 and the tip portions 15, I I5 of the tubular members 11, 111 to be reduced to such an extent that the rolling of the balls 14, 1 14 is not obstructed. Accordingly, the balls 14, 114 are prevented from being displaced in the sockets 10, 110, giving rise to no noises when the balls 14, 114 roll on a sheet of paper during writing nor their falling off the sockets 11, 111.
  • a socket for holding the writing ball (14) of a ball point pen comprising:
  • tubular member (11) having a longitudinally directed hole (13) formed therein and extending along the tubular member l 1), said hole (13) having at least a longitudinal portion of generally rectangular cross-section at the forward end portion thereof for surrounding the writing ball (14) at said forward end portion thereof;
  • a plurality of generally triangular ink outlets (20) formed in the inner walls (15a) of the tip portion (15) and extending along the tip portion (15) so as to communicate with the outside of the socket at the forward end thereof and with corresponding corners of the generally rectangular portion of the hole (13) at the rear end thereof;
  • ink duct means (18) extending lengthwise of the tubular member (11) and formed between the inner walls (13a) of the tubular member (11) and the outer wall (120) of the rod (12), the ink duct means (18) communicating with the ink outlets (20).

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US480516A 1973-06-29 1974-06-18 Socket for holding the writing ball of a ball-point pen Expired - Lifetime US3904297A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973076588U JPS5025628U (nl) 1973-06-29 1973-06-29

Publications (1)

Publication Number Publication Date
US3904297A true US3904297A (en) 1975-09-09

Family

ID=13609442

Family Applications (1)

Application Number Title Priority Date Filing Date
US480516A Expired - Lifetime US3904297A (en) 1973-06-29 1974-06-18 Socket for holding the writing ball of a ball-point pen

Country Status (2)

Country Link
US (1) US3904297A (nl)
JP (1) JPS5025628U (nl)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251164A (en) * 1976-03-19 1981-02-17 Pentel Kabushiki Kaisha Tip for ball point pen
US4524899A (en) * 1981-07-31 1985-06-25 Tokyo Sintered Metal Co., Ltd. Method of manufacturing vent element
US4603994A (en) * 1981-04-30 1986-08-05 Pentel Kabushiki Kaisha Ball-holder of a ball-point pen
EP0230966A1 (de) * 1986-01-21 1987-08-05 Rudi Hutt Schreibspitze
EP0188716B1 (de) * 1985-01-23 1988-12-28 Gebrüder Schneider GmbH Kugelschreiberspitze und Verfahren zu ihrer Herstellung
US4795286A (en) * 1985-10-17 1989-01-03 Teibow Co., Ltd. Pen tip structure
US4842433A (en) * 1985-10-17 1989-06-27 Teibow Co., Ltd. Pen tip structure
US4993860A (en) * 1986-05-13 1991-02-19 Lothar Sommer Applying device
US5150979A (en) * 1979-06-04 1992-09-29 Gallagher Paul H Ball point pen with liquid ink
US5383901A (en) * 1993-10-18 1995-01-24 Ethicon, Inc. Blunt point needles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1527971A (en) * 1923-01-30 1925-03-03 Forsell Arthur Pen
US3063420A (en) * 1954-04-29 1962-11-13 Parker Pen Co Writing instruments
US3537801A (en) * 1967-12-19 1970-11-03 Francisco Barcelloni Corte Ball point for writing instruments

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1527971A (en) * 1923-01-30 1925-03-03 Forsell Arthur Pen
US3063420A (en) * 1954-04-29 1962-11-13 Parker Pen Co Writing instruments
US3537801A (en) * 1967-12-19 1970-11-03 Francisco Barcelloni Corte Ball point for writing instruments

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251164A (en) * 1976-03-19 1981-02-17 Pentel Kabushiki Kaisha Tip for ball point pen
US5150979A (en) * 1979-06-04 1992-09-29 Gallagher Paul H Ball point pen with liquid ink
US4603994A (en) * 1981-04-30 1986-08-05 Pentel Kabushiki Kaisha Ball-holder of a ball-point pen
US4524899A (en) * 1981-07-31 1985-06-25 Tokyo Sintered Metal Co., Ltd. Method of manufacturing vent element
EP0188716B1 (de) * 1985-01-23 1988-12-28 Gebrüder Schneider GmbH Kugelschreiberspitze und Verfahren zu ihrer Herstellung
DE3502088C1 (de) * 1985-01-23 1989-04-27 Gebr. Schneider Gmbh, 7741 Tennenbronn Kugelschreiberspitze
US4795286A (en) * 1985-10-17 1989-01-03 Teibow Co., Ltd. Pen tip structure
US4842433A (en) * 1985-10-17 1989-06-27 Teibow Co., Ltd. Pen tip structure
EP0230966A1 (de) * 1986-01-21 1987-08-05 Rudi Hutt Schreibspitze
US4993860A (en) * 1986-05-13 1991-02-19 Lothar Sommer Applying device
US5383901A (en) * 1993-10-18 1995-01-24 Ethicon, Inc. Blunt point needles

Also Published As

Publication number Publication date
JPS5025628U (nl) 1975-03-24

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