US3539269A - Tube drawing pen - Google Patents

Tube drawing pen Download PDF

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Publication number
US3539269A
US3539269A US824958A US3539269DA US3539269A US 3539269 A US3539269 A US 3539269A US 824958 A US824958 A US 824958A US 3539269D A US3539269D A US 3539269DA US 3539269 A US3539269 A US 3539269A
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US
United States
Prior art keywords
threads
pen
tip
ink
tube
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
US824958A
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English (en)
Inventor
Gerald W Dahle
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3539269A publication Critical patent/US3539269A/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
    • B43K8/00—Pens with writing-points other than nibs or balls
    • B43K8/16—Pens with writing-points other than nibs or balls with tubular writing-points comprising a movable cleaning element
    • B43K8/18—Arrangements for feeding the ink to the writing-points

Definitions

  • a tube drawing pen in which the drawing tip is screwed into a sleeve to which an ink chamber may be tightly attached.
  • the corresponding external and internal screw threads on the drawing tip and in the sleeve are considerably narrower than the flutes between the threads so that, when the drawing tip is screwed into the sleeve until its rear end abuts against a conical inner stop surface in the sleeve, the flanks of the threads tightly engage at one side with each other, while the remaining open part of the flutes form a long spinal ventilating channel.
  • the present invention relates to a tube drawing pen which comprises a drawing tip which is screwed into a holder and the peripheral surface of which is provided with a ventilating channel.
  • Such a tube drawing pen consists of a drawing tip which is inserted into a holder of any desired shape or into an intermediate element.
  • the peripheral surface of such a drawing tip is usually provided with a ventilating channel which is preferably spirally curved or consists of longitudinal and transverse grooves and extends along the length of the part of the drawing tip, which is removably secured to the holder or intermediate element by being screwed or plugged into it.
  • All of these tube drawing pens have in common that it is diflicult to secure the drawing tip in the holder or intermediate element in a manner so as to prevent the ink from leaking out of the joint between the tip and the holder. This is due to the fact that changes in pressure occur in the ink chamber because of variations in air pressure or an increase in temperature. These pressure differences are to 'be compensated by the ventilating channels.
  • this object is attained by securing the drawing tip by a screw connection to the inner side of the holder or the intermediate element and by making the associated threads themselves, that is, those projecting inwardly from the drawing tip and those projecting outwardly from the holder or intermediate element, of a width smaller than the width of the flutes between the threads.
  • the screw threads and their flutes have two functions, namely, to secure the drawing tip within the holder or the intermediate element While the Wider flutes between the threads form a spirally shaped ventilating channel.
  • this channel has the best possible length insuring an effective pressure balance between the ink chamber and the outer atmosphere.
  • Another feature of the invention provides that, when the drawing tip is screwed into the holder or the intermediate element, its inner end abuts against a stop which is preferably provided in the form of an inner conical surface in the holder or the like upon which the inner end of the drawing tip engages so as to form a tightly sealed joint.
  • a stop which is preferably provided in the form of an inner conical surface in the holder or the like upon which the inner end of the drawing tip engages so as to form a tightly sealed joint.
  • the associated screw threads have a trapezoidal or rectangular cross section so that when they are screwed tightly together a substantially flat surface contact will be formed between the adjacent flanks which insures that these flanks will be in a tightly sealing engagement with each other and capillary effects will be avoided.
  • Such threads have the further advantage that their fian ks may be very accurately made by very simple means.
  • the invention further provides that the clearance which according to the invention is provided between the screw threads and the flutes between them has a non-capillary cross-sectional size in the axial and radial directions. Consequently, no capillary effects can also occur on the draw ing tip and the holder or intermediate element between the crests of the threads and the base of the flutes.
  • FIG. 1 shows an enlarged central longitudinal section of a tube drawing pen according to the invention
  • FIG. 2 shows an elevation of the tip unit of the drawing.
  • the rear part of the tip unit 1 of the drawing pen according to the invention facing the ink chamber 2 has a hollow cylindrical part 3 of a relative large inner diameter the conical front end 5 of which is tapered in the direction toward the ink outlet opening or nip 4 of the pen.
  • This inner cone 5 terminates into a bore 6 in which the thin drawing tube 7 is mounted.
  • the hollow cylindrical part 3 contains a weight mem her 8 which is axially slidable therein with considerable play and carries on its front end a very thin wire 9 which is adapted to keep the ink passage unclogged which extends through the drawing tube 7.
  • the hollow cylindrical part 3 of the tip unit 1 is provided with an external thread, generally indicated by the nu meral 10, by means of which the tip unit 1 is screwed into an internal thread, generally indicated by the numeral 11 in a sleeve 12.
  • the associated projecting threads 13 and 14 on sleeve 12 and on the part 3 are narrower than the flutes 15 and 16 between these threads.
  • the flat crests 17 and 18 of threads 13 and 14 are spaced at a noncapillary radial distance from the base of the flutes 15 and 16 into which they engage.
  • the external thread 10 and the internal thread 11 may be of a trapezoidal cross section, although they may also be of a rectangular or square cross section.
  • the cross-sectional dimensions and the length of the ventilating or compensating channel which remains free between the threads 13 and 14 are made so as to be in a very particular relation to the cross section of the ink channel and to the contents of the ink chamber 2.
  • a cylindrical tube 21 is screwed which serves as a stop for limiting the distance of the axial movement of the weight member 8 without, however, preventing the free flow of ink from the ink chamber 2.
  • This tube 21 serves in addition as a guide to facilitate the insertion of the rear end 19 of the tip unit 1 into the inner cone 20.
  • the front end of the ink chamber 2. is plugged tightly into an annular groove in the rear end of sleeve 12 so as to be sealed tightly to the latter.
  • the ink passes from the ink chamber 2 through the tube 21 and then through a transverse bore 23 in the cylindrical part 3 into the ventilating channel which remains between the flanks of the threads 13 and 14.
  • a tube drawing pen comprising a tip member having a tubular rear part with an open rear end and an external thread on a considerable part of the length of said tubular part, a thin drawing tube secured in and projecting from the front end of said tip member and communicating with the inside of said tubular part, a weight member slidable in the axial direction in said tubular part and having a very thin wire secured to its front end and extending axially through and slidable along said drawing tube a sleeve member having an internal thread corresponding to and having substantially the same length as said external thread, and an ink chamber removably but tightly connected to the rear end of said sleeve member, each of said threads having flanks and spiral flutes between said flanks of said threads, said flanks on one side of said threads adapted to engage tightly with each other when said tubular part is screwed as far as possible into said sleeve member, each of said threads having a considerably smaller Width than

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  • Pens And Brushes (AREA)
US824958A 1968-05-22 1969-05-15 Tube drawing pen Expired - Lifetime US3539269A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT490468A AT283155B (de) 1968-05-22 1968-05-22 Röhrchenschreiber

Publications (1)

Publication Number Publication Date
US3539269A true US3539269A (en) 1970-11-10

Family

ID=3569714

Family Applications (1)

Application Number Title Priority Date Filing Date
US824958A Expired - Lifetime US3539269A (en) 1968-05-22 1969-05-15 Tube drawing pen

Country Status (4)

Country Link
US (1) US3539269A (de)
AT (1) AT283155B (de)
DE (2) DE1994850U (de)
FR (1) FR2009068A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734633A (en) * 1970-03-05 1973-05-22 Koh I Noor Rapidograph Tubular writing point especially for automatic drafting machines
US3756733A (en) * 1971-12-01 1973-09-04 Koh I Noor Rapidograph Tubular writing pen
US3836266A (en) * 1972-07-21 1974-09-17 Koh I Noor Rapidograph Tube writing pen
US3870421A (en) * 1971-12-08 1975-03-11 Staedtler J S Tubular nib-type pen with a screwed-in nib
US4549828A (en) * 1982-12-03 1985-10-29 Rotring-Werke Riepe Kg Writing instrument with separable compensating means
US4753546A (en) * 1978-02-14 1988-06-28 Koh-I-Noor Rapidograph, Inc. Pressure balanced stylographic pen
US4930921A (en) * 1980-03-10 1990-06-05 Koh-I-Noor Rapidograph, Inc. Tubular writting pen with superposed pressure equalization chambers
US20150050061A1 (en) * 2012-02-27 2015-02-19 Mitsubishi Pencil Company, Limited Mechanical pencil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3415859C2 (de) * 1984-04-28 1991-10-10 Schmidt Feintechnik GmbH, 7742 St Georgen Plotterstift

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190515430A (en) * 1905-07-27 1905-11-02 Edward William Warriner Improvements in Stylographic Fountain Pens.
DE831656C (de) * 1949-11-15 1952-02-14 Josef Schndeider Fuellhalter mit massiver Feder
US3466132A (en) * 1966-03-12 1969-09-09 Rapidograph Inc Writing head for a tube writing pen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190515430A (en) * 1905-07-27 1905-11-02 Edward William Warriner Improvements in Stylographic Fountain Pens.
DE831656C (de) * 1949-11-15 1952-02-14 Josef Schndeider Fuellhalter mit massiver Feder
US3466132A (en) * 1966-03-12 1969-09-09 Rapidograph Inc Writing head for a tube writing pen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734633A (en) * 1970-03-05 1973-05-22 Koh I Noor Rapidograph Tubular writing point especially for automatic drafting machines
US3756733A (en) * 1971-12-01 1973-09-04 Koh I Noor Rapidograph Tubular writing pen
US3870421A (en) * 1971-12-08 1975-03-11 Staedtler J S Tubular nib-type pen with a screwed-in nib
US3836266A (en) * 1972-07-21 1974-09-17 Koh I Noor Rapidograph Tube writing pen
US4753546A (en) * 1978-02-14 1988-06-28 Koh-I-Noor Rapidograph, Inc. Pressure balanced stylographic pen
US4930921A (en) * 1980-03-10 1990-06-05 Koh-I-Noor Rapidograph, Inc. Tubular writting pen with superposed pressure equalization chambers
US4549828A (en) * 1982-12-03 1985-10-29 Rotring-Werke Riepe Kg Writing instrument with separable compensating means
US20150050061A1 (en) * 2012-02-27 2015-02-19 Mitsubishi Pencil Company, Limited Mechanical pencil
US9669649B2 (en) * 2012-02-27 2017-06-06 Mitsubishi Pencil Company, Limited Mechanical pencil

Also Published As

Publication number Publication date
AT283155B (de) 1970-07-27
DE1800223A1 (de) 1969-12-11
FR2009068A1 (de) 1970-01-30
DE1994850U (de) 1968-10-17

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