US2732829A - fehling - Google Patents

fehling Download PDF

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Publication number
US2732829A
US2732829A US2732829DA US2732829A US 2732829 A US2732829 A US 2732829A US 2732829D A US2732829D A US 2732829DA US 2732829 A US2732829 A US 2732829A
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US
United States
Prior art keywords
ink
tube
reservoir
liquid
sharp
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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
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English (en)
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00—Ball-point pens
    • B43K7/02—Ink reservoirs; Ink cartridges
    • B43K7/08—Preventing leakage

Definitions

  • the ink reservoir is constituted by a tube which at one end communicates with the bail but which at the other end has ,a layer of a liquid more viscous than the ink.
  • the ink reservoir is constituted by a tube which at one end communicates with the bail but which at the other end has ,a layer of a liquid more viscous than the ink.
  • the internal diameter of the ink reservoir is not more than 2.5 mm.
  • the meniscus formed in the ink column at the end remote from the ball is so strong that under normal conditions of use intemperate latitudes, it will not break and the ink will not creep out of the open end.
  • the volume of ink in a reservoir of "2.5 mm. internal diameter is however, necessarily limited having regard lf the internal diameter of the reservoir is increased beyond 2.5 mm. internal diameter to atord a larger volume of inlcth'e risk of breakage of said meniscus or ink creepage is increased.
  • the present invention resides, ltherefore, -in
  • step or groove being so arranged as to ai'ord a sharp change in direction of movement to uid tending to llow axially relatively thereto.
  • Any suitable ink may be employed in writing instruments of the type specied; examples of suitable inks are disclosed in co-pending patent applications Seiial Number 657,598, liled March 27, 1946, and Serial Number 659,149, led April 2, 1946, both -now abandoned.
  • Figure 1 shows (mainly in cross section and by way of example) a reservoir writing instrument of the type specified according to the invention.
  • ⁇ Figure 2 is a diagrammatic View of an ink reservoir according to this invention.
  • Figure is an alternative construction to Figure 2.
  • Figure 4 Vis another alternative construction of Figure 2.
  • Figure 5 is a detailed View of a split ring.
  • Figs. 6 and 7 show partly sectional, fragmental Views of embodiments of this invention.
  • the instrument shown in Figure'l comprises a writing extremity 1 which houses a ball 2 and is connected to a tubular reservoir 3.
  • This reservoir communicates with the gap between the ball and its housing by means of a'srnall-diameter feed duct.
  • the said gap and feed duct are not illustrated since they are well understood by these familiar with the construction of writing instruments of the type specified. It may be mentioned, however, that the ball is desirably in the order of 1 mm. in diameter, the diameter of the feed duct at that end thereof which communicates with the ball housing is less than that of the ball, and the width of the gap is preferably between 1 104 and l l03 cms.
  • the unit consisting of the Writing extremity ll and the reservoir 3, is housed in a casing consisting of a barrel 4 provided with an air hole 5 and an adaptor 6.
  • the writing extremity is screwed into the adaptor 6 at 7 and said adaptor and barrel are screwed together at 8.
  • a cap not shown, may be provided which when the instrument is not in use, ts over a ring in the casing at 13 to protect the Writing extremity and which, when the instrument is in use, is fitted over the other end of said instrument.
  • the ink constituting the writing fluid is shown at 10.
  • the ink column forms a continuous vein of liquidexball and -its housing.
  • This groove or channel is formed as a ring inside the reservoir so that it is between the meniscus 11 and the open end of the reservoir 9.
  • the ring provides a step over which the lm of ink must ow.
  • ink column 10 is shown surmounted by a layer of another liquid 14 more viscous than the ink.
  • two grooves 15 and 16 of square cross section are shown situated between the viscous liquid 14 and the open end of the tube 9.
  • a piston or float 17 is shown resting on the top of the ink column l0.
  • the grooves 18 and 19 are shown separated from each other by a sharp ridge 20. These grooves may be adjacent to each other as shown, or they may be of a certain distance from one another.
  • the end of the reservoir is closed but the contents of the reservoir are maintained at atmospheric pressure by means of the small air vent 21.
  • Figure 4 shows the rear end of an ink reservoir similar to that shown in Figure 2.
  • the grooves formed in the inside of the reservoir of Figure 2 are replaced by removable rings 23.
  • a more detailed view of one of these rings is shown in Figure from which it will be seen that the ring 23 is a noncontinuous ring having a gap 26; formed in the inside of the ring is a V-shaped groove 22 having comparatively sharp edges 27 and 28.
  • the ring is preferably of resilient material of such a size that when the ring is compressed so that the gap Z6 is closed (i. e. the two faces 24 and 25 separated by the gap 26 are in contact) the maximum diameter of the ring is the same as the internal diameter of the ink reservoir.
  • the rings are pushed into the reservoir from the open end 9.and in Figure 4 it will be seen that two rings are provided with a short space 29 between them; preferably the gaps 26 are not in line with one another.
  • the groove 22 in the rings act as a reservoir for any ink which may creep but also the gap 2g formed between the walls of the two rings 23 will also function as an ink reservoir.
  • the cross sectional shape of the grooves or channels is square or V-shaped. It will be appreciated that any suitable cross sectional shape may be used but it is preferable to use a shape which will leave a comparatively sharp edge both for entering and leaving the groove when approached in a direction along the axis of the reservoir. The reason for the sharp edge is simply explained.
  • the groove also acts as a reservoir for any creeping liquid. As the liquid creeps into the grooves the groove itself acts as a capillary reservoir thus causing the liquid to fill up the groove before trying to escape therefrom; by providing a plurality of grooves the total capacity is of course increased.
  • lt may be said that usually the total volume of ink which creeps during the life of one of these ink reservoirs (that is before all the ink in the reservoir is consumed by usage), is comparatively small.
  • the ink capacity of one of the grooves according to this invention is very small compared with that of the ink reservoir, but is in general sufficient to accommodate the volume of ink which creeps.
  • each step 30 has an obtuse angle to said axis.
  • the ink column is represented at 3.9.
  • the open mouth of the reservoir its flow is arrested by each step in turn for the reason that the ink, due to surface tension, exhibits a reluctance to eiect a violent change of direction in the ow.
  • the number of steps may be varied as desired but in practice it is found that two or three are adequate to prevent ink owing out of the open mouth of the reservoir.
  • a groove may of course be provided at the base of each step but the essential inhibition to ink creepage is the step itself and the advantage of the constructions illustrated in the embodiments shown in Figures 6 and 7 is that they can readily be produced by a moulding process and do not necessitate a separate operation such as is entailed in the formation of grooves after the tube has been produced.
  • a vented tube intended for the reception of a viscous liquid and suitable for use as an ink reservoir in writing instruments of the type having at least one peripheral and continuous step between the vent and the adjacent end of the liquid column, when the tube is charged with such liquid, said step providing a sharp angle on the inner surface of said tube and located intermediate said vent and that end of the column of liquid adjacent thereto in said tube when said tube is charged with said liquid, said step providing a passage of substantially similar diametric dimension as the inside diameter of said tube and in direct coaxial communication with the inner surface of said tube thereby aifording a sharp angular change in direction of movement to fluid tending to iiow axially relative thereto, the bore of the reservoir on either side of said step for preventing the flow of ink being substantially the same.
  • a vented tube intended for the reception of a viscous liquid and suitable for use as an ink reservoir in writing instruments of the type having between the vent and the adjacent end of the liquid column when the tube is charged with such liquid, a plurality of spaced peripheral and continuous steps formed in the inner surface of said tube, said steps being of successively wider area and located away from the longitudinal axis of said tube and disposed intermediate said vent and that end of the column of liquid adjacent thereto in said tube when said tube is charged with said liquid, thereby affording a sharp angular change in direction of movement to fluid tending to flow axially relative thereto.
  • a vented ink reservoir tube for a writing instrument having means for arresting or preventing the ow of ink from said vented tube, said means comprising a portion provided with a peripheral and substantially continuous recess formed along the inner surface of said tube, said recess being sharp-edged on the side of the column of ink to prevent the ow of ink into said recess, said recess being disposed intermediate said vent and the end of the column of liquid adjacent thereto in said tube when said tube is charged with said liquid, said recess being substantially coaxial with said tube and providing a passage of substantially similar diametric ⁇ dimension as the lf for any reason said ink tends to creep towardsinside diameter of said tube and in direct coaxial communication with the unrecessed inner surfaces of said tube thereby providing a sharp change in the direction of movement of lluid tending to flow axially relative thereto.
  • An ink reservoir tube for accommodating a column of ink therein for use in a ball point writing instrument having a vent for the admission of air and means for preventing creep of a film of ink along the interior surface of the tube towards said vent, said means comprising at least one peripherally continuous sharp-edged portion along the interior surface of said tube providing a passage in direct coaxial communication with the inside of said tube and of substantially similar diametric dimension as the inside diameter of said tube, the sharp edge being located on the side of the column of ink to prevent the ow of ink into said passage.
  • An ink reservoir tube for accommodating a column of ink therein for use in a ball point writing instrument, said tube being provided with a vent for the admission of air as the ink is used up in writing, and means for hindering creep of a film of ink along the surface of said tube towards said vent, said means consisting of at least one abrupt sharp-edged peripheral steplike portion of substantially uniform width in the interior of said tube at a location inwardly of said vent, said step-like portion providing a passage of a diametric dimension at least as large as the inside diameter of said tube in direct substantial coaxial communication with the inside of said tube and presenting a sharp edge on the side of said steplike portion adjacent the column of ink to prevent the How of ink into said passage, the sharp edge extending completely around the interior of said tube and with at least a part thereof away from the longitudinal axis of said tube.

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  • Pens And Brushes (AREA)
US2732829D 1948-09-23 fehling Expired - Lifetime US2732829A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB280522X 1948-09-23
GB20649X 1949-06-02
GB40649X 1949-06-04
GB200949X 1949-09-20

Publications (1)

Publication Number Publication Date
US2732829A true US2732829A (en) 1956-01-31

Family

ID=27447203

Family Applications (1)

Application Number Title Priority Date Filing Date
US2732829D Expired - Lifetime US2732829A (en) 1948-09-23 fehling

Country Status (7)

Country Link
US (1) US2732829A (sk)
BE (1) BE491286A (sk)
CH (1) CH280522A (sk)
DE (1) DE870814C (sk)
FR (1) FR995969A (sk)
GB (1) GB695862A (sk)
LU (1) LU29725A1 (sk)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008453A (en) * 1958-04-03 1961-11-14 Kahn David Inc Writing instruments
US3458266A (en) * 1966-09-15 1969-07-29 Parker Pen Co Ball point writing instrument
US6010269A (en) * 1997-10-15 2000-01-04 The Pilot Ink Co., Ltd. Writing implement
US6376560B1 (en) * 1997-07-31 2002-04-23 Mitsubishi Pencil Kabushikikaisha Ink follower for water-base ballpoint pens and method of manufacturing the same
US6391927B1 (en) * 1997-07-31 2002-05-21 Mitsubishi Pencil Kabushikikaisha Method for manufacturing ink follower for water base ballpoint pens

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB582186A (sk) *
US682574A (en) * 1901-06-03 1901-09-10 James A Skilton Fountain-pen.
US2087139A (en) * 1936-07-22 1937-07-13 William P Cameron Liquid supply nozzle
GB571698A (en) * 1944-07-19 1945-09-05 Laszlo Jozsef Biro Writing instrument
US2435123A (en) * 1944-07-19 1948-01-27 Eversharp Inc Fountain pen
CH254826A (fr) * 1943-03-25 1948-05-31 Claret Lucien Porte-plume ou objet analogue à réservoir.
US2452504A (en) * 1945-07-27 1948-10-26 Parker Pen Co Writing instrument
US2500998A (en) * 1947-12-13 1950-03-21 Universal Fountain Pen & Penci Ball-pointed pen
US2504649A (en) * 1945-02-14 1950-04-18 Eagle Pencil Co Ball point writing implement
US2519635A (en) * 1946-03-25 1950-08-22 Claret Lucien Fountain pen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB582186A (sk) *
US682574A (en) * 1901-06-03 1901-09-10 James A Skilton Fountain-pen.
US2087139A (en) * 1936-07-22 1937-07-13 William P Cameron Liquid supply nozzle
CH254826A (fr) * 1943-03-25 1948-05-31 Claret Lucien Porte-plume ou objet analogue à réservoir.
GB571698A (en) * 1944-07-19 1945-09-05 Laszlo Jozsef Biro Writing instrument
US2435123A (en) * 1944-07-19 1948-01-27 Eversharp Inc Fountain pen
US2504649A (en) * 1945-02-14 1950-04-18 Eagle Pencil Co Ball point writing implement
US2452504A (en) * 1945-07-27 1948-10-26 Parker Pen Co Writing instrument
US2519635A (en) * 1946-03-25 1950-08-22 Claret Lucien Fountain pen
US2500998A (en) * 1947-12-13 1950-03-21 Universal Fountain Pen & Penci Ball-pointed pen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008453A (en) * 1958-04-03 1961-11-14 Kahn David Inc Writing instruments
US3458266A (en) * 1966-09-15 1969-07-29 Parker Pen Co Ball point writing instrument
US6376560B1 (en) * 1997-07-31 2002-04-23 Mitsubishi Pencil Kabushikikaisha Ink follower for water-base ballpoint pens and method of manufacturing the same
US6391927B1 (en) * 1997-07-31 2002-05-21 Mitsubishi Pencil Kabushikikaisha Method for manufacturing ink follower for water base ballpoint pens
US6010269A (en) * 1997-10-15 2000-01-04 The Pilot Ink Co., Ltd. Writing implement

Also Published As

Publication number Publication date
FR995969A (fr) 1951-12-11
CH280522A (fr) 1952-01-31
GB695862A (en) 1953-08-19
DE870814C (de) 1953-03-16
LU29725A1 (sk)
BE491286A (sk)

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