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Publication numberUS2899931 A
Publication typeGrant
Publication dateAug 18, 1959
Filing dateMay 2, 1955
Priority dateMar 3, 1955
Publication numberUS 2899931 A, US 2899931A, US-A-2899931, US2899931 A, US2899931A
InventorsHelmut Bross
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Retractable writing element
US 2899931 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Aug. 18, 1959 H. BRoss WRITING DEVICE HAVING AN EXTENSIBLE AND RETRACTABLE WRITING ELEMENT 3 Sheets-Sheet 1 Filed May 2, 1955 ln ven for.'


Fig. 6

lnven for:

torneys Aug. 18, 1959 Filed May 2, 1955 Fig. 4

Aug. 18, 1959 H. BRoss 2,899,931

WRITING DEVICE HAVING AN ExTENsIBLE AND RETRACTAELE WRITING ELEMENT Filed May 2, 1955 s sheets-sheet E /MMM Horneys United States Patent WRITING DEVICE HAVING AN EXTENSIBLE AND RETRACTABLE WRITING ELEMENT Helmut Bross, Braunschweig, Germany, assigner to Guenther Wagner, Hannover, Germany Application May 2, 19,55, Serial No.- 505,401

' 12 claims. (Cl. 12o- 22) This invention relates to hand appliances, particularly writing appliances, each with a hollow barrel, in some cases assembled from several parts, and-unalterabjle i-n length, which has sufficient stiffness for its use, and wherein is mounted a tubular organ, particularly a carrier of a writing medium, which is longitudinally displaceable by finger pressure through a reversing mechanism.

The object of the invention is to simplify the construction and operation of such appliances.

An essential feature of the invention consists in the barrel being made wholly or partially elastically yielding and provided on the inside, within the range of the elastic portion, with at least one actuating element, preferably effective from all sides, which, on deformation of the barrel by transversely directed nger pressure, longitudinally displaces the tubular organ. j

According to a preferred constructional form of the invention, the barrel is made capable of being bent out of shape or distorted.

The invention is directed moreover 'to the particular constructionV of the reversing mechanism' which effects, on deformation of the barrel, longitudinal `displacement of the tubular orga-n, particularly a carrier of a writing medium, mounted in the barrel. v

The invention is 'directed also to a constructional form wherein the rigid tubular organ receiving the writing-medium, especially a ball-point reservoir unit, bears with its rear end against an inclined interior end wall of the barrel, so that the tubularV organ is displaced by bending the barrel. i' Y Further 'essential featuresfof .the invention are disclosed in the following description.

Various constructional examples of the invention are shown in the accompanying drawings, in which:

Fig. 1 is a 'longitudinal section of a ball-point writing appliance made according to the invention, having a barrel bendable about a rigid mid-portion thereof.



' illustrated in Figs. 9 and 10.

Fig. 12 is a'longitudinal section of a press propelling pencil like the ball-point pen of Fig. 6 but somewhat otherwise constructed.

The ball-point writing appliance shown in Figs. 1 and 2, has a three-part hollow barrel, the front and rear por-` tions 1 and 2 of which are formed elastically bendable, and are for example composed of a polyamide with low modulus of elasticity. The barrel has sufficient stilness to be usable as a writing appliance. The lfront portion 1 vand the rear portion 2 are united by an interposed metal screwthreaded sleeve 3, which is formed with an annular internal ange 4. If the hollow barrel is for instance in the writing position'supported -by hand and stressed in the directions of the arrows 5, 6 and'7 the barrel can then be bent to a certain extent. On the pressure ceasing the barrel reassumes its original shape.

Inside the hollow barrel is a stiff centrally located tube '8, which isv mounted by its end in the ends of the barrel. yThe tube V8 is provided, atthe region of the internal flan-ge 4, with an, external cone 9. Inside the tube 8 a ball-pointreservoir unit 1-1 is mounted, which bears by its rear end against a crimping 12 of the tube 8. The point of the ball-point reservoir unit 11 is located with play in the nose 14 of the front portion 1 of the barrel. vThe rear end of the barrel is formed with an inner bore 15, in which the rear end of the tube 8 engages, likewise with play, by means of an interposed external flange 16. By this mounting of the ends of the tube 8 and of the ball-point reservoir unit 11, the bending of thebarrel is hindered neither by the tube nor by the unit 11.

The ball-point reservoir unit 11 is subject to the inuence of a retracting spring 17, which bears on the one hand against a flange 1 8 of the unit and on the other hand, through a sleeve 19 longitudinally displaceable along the unit, lagainst the front barrel portion 1. The tube 8 engages over thellange 1S and is guided on the 'sleeve 19.

On bending the barrel towards the essentially stiff tube 8 as shown in Fig. 3, the internal flange 4 acts on the inclined surface of the cone 9 to effect thereby a displacement of the tube 8 and therewith the ball-point reservoir unit in the direction of the arrow 10. In order, on resumption by the barrel of its original shape, to hold the ball-point reservoir unit in the writing position, a lock- Fig. 2 is a developmentV of the ylocking mechanism used in the appliance of Fig. 1.

Fig. 3 is a longitudinal section of the middle portion of the appliance of Fig-1 in the operative position. Fig.'4 is a llongitudinal section of a propelling pencil provided with. clamping jawsy with a 'barrel bendable to the Fig. 9 is a longitudinal section of the end ,of the'lead tube of a modified constructional form like the constructional form of Fig. 6. r Fig. 10 is an internal View, on a larger scale, of the inclinedv wall surface with aguide groove .for thecon- Structional form of Fig. 9, r

ing arrangement is required.

` This locking device is arranged in the bore 15 of the rear barrel end. It consists of a toothed sleeve 29, fast with the tube 8 and bearing the shallow external ange 16, which is displaceable, together with the tube 8, between two projections 21 and 22 provided on the inside of the barrel. The ring sleeve has at the lower end saw teeth 23 with a Vertical and slantingvflank `and at the top pairs ofl teethv24 and 25. The teeth 23 are inclined oppositely tothe slanting flank and offset with respect to the teeth 24 and 25 by a half tooth width. Tooth 25 has a slot 26 alongside the vertical ank of tooth 24 of a width corresponding to the half tooth width. The longitudi-nal slot 26 serves to receive the longitudinal projection 22. f j i Y *l If, as already described, the tube 8 and therewith the toothedgsleevel 2,0 are moved by transverse pressure on the barrel in the direction of the arrow 10, the tooth sleeve-20 then comes out of the range of the projection 22 and encounters, with a tooth 23, the p-rojection 21. An inclined surface of the projection 21 effects, in conjunction with the inclined surface of the tooth 23, rotation of the toothed sleeve 20 and therewith also of the tube 8, of half the tooth pitch in the direction of the arrow 27 of Fig. 2..Y If the barrel goesback to its normal posi- 3 tion, the spring 17 then presses the tube 8 again rearwards until the tooth 24 of the toothed sleeve 20 encounters the projection 22.. As a result of the inclined flanks of the tooth 24 and of the projection 22 the toothed'sleeve carries out a further rotation of a half tooth pitch. The

projection 22 now holds the lsleeve 2i) in the space 28 between teeth. This position corresponds to the writing position in which the unit 11 projects from the nose 1'4. On a further bending of the barrel the displacing operations proceed in like manner, wherewith however the toothed sleeve 20 arrives again with the slot 26 in the range of the projection 22. This position corresponds to the position of rest, in which the partsagain assume the position shown in Figs. l andA 2.

Instead of the locking arrangement shown, other arrangements are conceivable with which the tube 8 moves into the writing position or into the position of rest or can be held therein. The deformability of the barrel can also be brought about, by simply the intermediate piece 45 being elastic, while the front portion 44- and rear portion 46 of the barrel arerigid (see Fig. 5),. The writing medium carrier has the displacing and stop devices as represented in Fig. 1. If the hollow shaft is bent by the pressure of the root joint 47 of the foreiinger on the rear part 46 and by the pressure of the thumb 48 on the middle part 45 as shown in dotted lines, the writing medium carrier as illustrated in Fig. 1 is displaced.

In Fig. 4 a propelling pencil according to the invention is provided with an elastically bendable barrel as shown, which consists of a front half 31 and a rear half 32. The nose of the front half 31 is lined with a metal sleeve 33. In the end of the rear half 32 a bore is provided, which likewise is lined with a metal stressed in the opposite direction, namely in theY vdirection of the arrows 74. The unit is thereby un-stressed. The unit then slides back again on the ridge 69 into the position shown in Fig. 4. As the bending of the barrel has to take place in an absolutely determined'plane going through the longitudinal axis, the barrel can be provided on the outside with appropriate marking. Also it can be of advantage, precisely with this constructional form, to give the barrel a non-round external configuration, for example the hexagonal shape shown in Fig. 8.

Figs. 9 and l0 show a modification of the constructional .form of Figs. 6 to 8, in which on the'rear end of the unit 75 a cap 76 is set, which ends in a pin 77. In this embodiment, a wall 78 is provided at the rear end of the barrel instead of the bevel part 69 shown in Figs. 6 to 8 and the wall is formed with an endless groove 79.

Pin 77 is pressed by retracting spring 68 on the base face of the groove and is guided inrsuch groove. A writing unit 75. is mounted at the front end of theV barrel for pivotal and translatory movement. For the purpose of displacing unit 75 on movement of the pin in the groove 79, the groove is provided with a varying depth. The groove is subdivided into four sections 81, 84, 83, 82 and hasa resting spot or zone 87 for the end of the pin corresponding to the writing position of unit 75. In Fig. 10, the inoperative position of the unit 75, retracted into the barrel, is indicated by the cross-hatched circle denoting the pin 77 of the unit.l The pin travels through sleeve 34. In the sleeve 33 a lead-guide tube 35 is guided, j

which at the front end is formed into clamping jaws 36, known per se, and the rear end of which is enlarged into a lead-magazine 37 `and finally is prolonged by a rigid rod 38, the end of which is guided in the sleeve 34. On the rod 38 is mounted a anged sleeve 39, which is located in the range of a hollow cone 40. The hollow cone is secured frontally to the rear half 32 and serves also by a screwthreading as `a connecting member for interconnection of the two halves of the barrel. The propelling mechanism is moreover provided with the usual returning spring 41.

On bending the barrel in the directions of the three arrows 42, the hollow cone exerts a thrust on the ange of the sleeve 39 of the propelling mechanism, which results in a forward displacement of the lead-guiding tube. Thereby in the knownmanner the clamping jaws 36 are relaxed, which permits a displacement of the lead 43 issuing from the clamping jaws. On the barrel resuming its normal position, the spring 41 pushes the lead-guide tube 25 back into the barrel again. The clamping jaws 36 are closed. Obviously with this construction other kinds of propelling mechanism can be used. n

In the ball-point pen shown in Figs. 6 to 8 the ballpoint reservoir unit `67 is tiltably mounted about the `point of the unit, in the barrel 66, formed elastic at least in its rear half. The rear end of the unit 67 bears, with the aid of the retracting spring 68, known perse, on an inclined ridge 69, which is provided on 'a plug 70, screwed i groove 79 in the direction indicated by the arrow 80,V

and at the boundary between sections 83 and 84, the( former is deeper than the latter. Also, at the boundary between the sections 84 and 81, the former section is deeper than the latter section and each such boundary is formed by a step.V

Upon bending the barrel by forces acting inthe direction of the arrows 73 (Fig. 6), the pin 77 is forced to move in section 81 of the groove 79 towards the section 84. This is the only direction the same can move along from its position shown in Fig. 10 as the way to the sec tion 82 is barred due to step 85 between the sections 81 and 82. In the direction of the movement of the pin 77, groove section 81 is inclined towards the operating position and, thus, as the pin moves along, the unit is gradually pushed towards the operating position and the tip of the unit protrudes out of the barrel. When the pressure on the vbarrel decreases, the barrel straightens and the pin 77 slides along step `86 into notch 87. The

from the rear into the barrel. For the purpose of .guid- I ing the end of the unit on the ridge `69 the plug 70 `has two cheeks 71 extending parallel to the ridge. The ridge 69 is reverted to form a rest 72, on which the usually somewhat concave rear end of the unit can seat itself.

If the barrel in the position of Fig. 6 is stressed in the directions of the arrows 73 and thereby somewhat-bent, the substantially rigid unit 67 then becomes rocked into the operative position shown in Fig. 7; during which the rear end of the'unit slides on the ridge 69, so that the unit is thrust forward. The unit in the operative posi tion then springs on to the rest 72. In order toV bring the unit into the position of rest, the barrel must be writing point or tip of the unit is now in the position for use. Upon again bending the barrel, the pin will leave the notch 87 and slide along section 83 of the groove and drop over step 89 into section 82 of the groove. The section 82 is sloped towards the retracted position of the writing unit, when progressing inthe direction of arrow 80. Hence, after the force on the barrel ceases and the latter straightens, the pin 77 will slide in section 82 in the direction of arrow 80 and, by the slope of and under the pressure of the spring, the pin, together with the writing unit, will be forced in the direction towards the retracted position. Finally, at the end portion of section 82, the pin 77 drops down at the step V85 into its initial position in section 81, corresponding to the full retracted position of the writing unit 75. A

With this constructional form, 'it suices toV Vindicate as the pressing position only a single position on the outer rsurface of the barrel, for example by arwart or a depression. Y

The construction-a1 forms of Figs. 6 to 8 have the merit of exceptional simplicity ofvarrangement and there`V with cheapness of construction.

In Fig. 12 a propelling pencil is shown the basic construction corresponds substantially to the ball-point pen of Figs. 6 to 8. The bendable barrel 90 is closed by a plug 91 with eccentric internal conicity, against which bears the rear end of the lead-tube 93 under the influence of a clamping spring 92. To avoid a large idle bending stroke, the lead-tube 93 can be provided with a flange 94, which is somewhat larger than is necessary for providing an abutment for the spring 92. At each bending and recovery of the barrel the lead-tube 93 carries out one forward and backward movement, which, in the manner known per se, can be utilised for advancing and clamping the pencil lead.

The plug 91 of Fig. l2 with the eccentric inner cone requires a bending of the shaft 90 in a definite plane. If it is desired that the lead tube 93 on bending shaft 90 be displaced in any direction, the hollow cone of the plug 91 is constructed as a concentric cone of Figs. 6, 8.

The constructional examples shown are only to illustrate the invention, so that in case of need possibly for manufacturing reasons desirable alterations may be made, without altering the essence of the invention.

I claim:

1. In -a writing device of the type having an extensible and retractable rigid writing element provided with a point, a hollow barrel surrounding said writing element blocked at one end and having an opening at the other end through which the point of said writing element may extend, means to normally bias said writing element away from said opening, said barrel being at least in part of flexible material so that it may be bent for curving the barrel transversely of its axis, coacting surfaces on the barrel and the rigid writing element, one of said surfaces being inclined to the axis of the barrel so that upon curving the barrel, said surfaces cooperate to force the writing element point through said opening, and means `adjacent said blocked end and acting under the influence of the bias means to retain the writing element in position with its point through said opening, said writing element being released, upon subsequent curving of the barrel, to return under the influence of said biasing means to its original position.

2. A writing device as per claim 1 wherein at least at one end, a tube is mounted in the barrel so that the same has a stiffening effect on the barrel, the said tube serving as guide means for a sliding movement of the writing element.

3. A writing device as per claim 1 wherein the barrel comprises a front part and a rear part of rigid material and a flanged nipple connecting said parts, the flanged nipple being composed of elastic bendable material.

4. Writing device as per claim 1, wherein stops are provided in the barrel and on the writing element, said stops being adapted to hold the writing element in the position to which it is moved by displacement upon cessation of bending the barrel and defining the holding device.

5. Writing device as per claim 4 wherein said stops combine with driving elements in one ring sleeve with saw teeth on the upper and lower edge of an even number of teeth each with vertical and slanting flanks, the inclination of the teeth of the slanting flanks on the upper end of said ring being opposite to those on the lower edge, said teeth having equal tooth widths, the teeth on the upper edge being offset to the teeth on the lower edge by half a tooth width, the teeth on the upper edge each alternately including a slot at their bottoms alongside the vertical flank of the adjacent tooth, the slot having a width corresponding to one half of the width of the tooth gap, and two stops in the barrel receiving between them the ring sleeve in spaced relation to one another permitting a displacement of the sleeve with the writing element.

6. Writing device as per claim 1, wherein the barrel is composed of a front part and a rear part, said parts being connected by a flanged nipple of rigid material, the front and rear parts being elastically bendable transverse ly of their axes.

7. Writing device as per claim 1, Wherein'the rear end of the barrel is shaped as a hollow cone, while a clamping device is provided for holding the writing element in its position upon cessation of bending the barrel.

8. Writing device as per claim 1, wherein the barrel is composed of a front and a rear part, the front part being of rigid material and the rear part of flexible material.

9. A writing device as claimed in claim l wherein the writing element is supported for slidable movement along and pivotal movement about a point at the front part of the barrel, said inclined surface being a bevel arranged at the rear end of the barrel, said writing element bearing at its free end against said bevel, with such free end defining the coacting surface on the writing element, and a holding device constitutes the means for retaining the writing element in its position upon cessation of bending the barrel.

l0. Writing device as per claim 9, wherein a groove is formed in said bevel, in which groove the writing element is guided, at the forward end of said groove a rest into which the writing element fits.

ll. Writing device as per claim 9, wherein the writing element is supported for slidable movement along and pivotal movement about a point at a front part of the barrel, a surface at the end of the barrel, an endless guide groove formed in said surface for guiding the end o1 the,

Writing element, the guide groove being divided into four sections, the groove sections having different depths, the

adjacent sections being separated by a step, declining corresponding to the direction of motion of the end of the writing element, the motion beginning from the deepest spot of the guide groove, said spot being a stop for holding the writing element in its retracted position, and another stop arranged two sections away from the first stop and serving to hold the writing element in its operating position.

12. A hand writing implement consisting of a barrel including a substantially tubular wall, a rigid carrier for the writing medium, a spring in the barrel mounted with one end on the barrel and engaging the carrier with the other end to hold the carrier retracted into the barrel, the walls of the barrel being of sufficient rigidity for the use of the implement in writing, said barrel being elastic so that it may be bent for curving the barrel transversely of its axis, driving surfaces on the inner side of the wall of said barrel and on the rigid writing medium carrier, respectively, at least one of said driving surfaces having an inclined guiding face engageable with said other driving surface whereby, on bending the barrel by transversely directed finger pressure to displace the rigid writing medium carrier in lengthwise direction in opposition to the spring, the driving surface on the carrier is forwardly cammed, and retaining means for holding the writing medium carrier in its position, said retaining means being effective under the bias of said spring after cessation of bending the barrel.

References Cited in the le of this patent UNITED STATES PATENTS 1,518,822 Saadi Dec. 9, 1924 2,580,754 Frentzel Jan. 1, 1952 A FOREIGN PATENTS 125,464 Austraua Sept. 12, 1947 825,782 Germany Nov. 24, 1952

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1518822 *Mar 26, 1924Dec 9, 1924Edward SaadiPencil
US2580754 *Nov 15, 1945Jan 1, 1952Parker Pen CoWriting instrument
AU125464B * Title not available
DE825782C *Oct 2, 1948Nov 24, 1952Helmut Bross Dipl IngBetaetigungsglied fuer mechanische Bewegungsuebertragung, insbesondere fuer den Vorschub der Minen in Fuellbleistiften
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2941509 *Oct 28, 1957Jun 21, 1960Carlos Anderton WalterMechanical pencil with eraser
US3147740 *Nov 30, 1961Sep 8, 1964Frank T JohmannWriting instrument
US3179088 *Nov 9, 1961Apr 20, 1965Johmann Frank TWriting instrument
US3200792 *May 31, 1963Aug 17, 1965Zepell Nathan AWriting instrument
US3223072 *Jul 23, 1963Dec 14, 1965Frank T JohmannSwitching device
US3233592 *Jul 14, 1964Feb 8, 1966Karl Bross HelmutWriting implement with a bendable casing
US3311089 *Sep 14, 1964Mar 28, 1967Rudolf VogelWriting instrument
US3891329 *Apr 26, 1974Jun 24, 1975Platinum Pen Co LtdWriting implement
US4319106 *Mar 31, 1980Mar 9, 1982Armitage Ralph TPush button switch
US4381158 *Dec 29, 1980Apr 26, 1983Dino L. GarganeseWriting instrument
US7303351 *Jan 30, 2003Dec 4, 2007Mitsubishi Pencil Kabushiki KaishaWriting instrument and welding method of writing point assembly and writing instrument parts connecting structure and connecting method
US20050074274 *Jan 30, 2003Apr 7, 2005Kazuhiko FurukawaWriting instrument and welding method of writing point assembly and writing instrument parts connecting structure and connecting method
CN100471690CJan 30, 2003Mar 25, 2009三菱铅笔株式会社Welding method of writing tool and writing point assembly, writing tool parts connecting structure and connecting method
WO2003101757A2 *May 29, 2003Dec 11, 2003Luc Marcel LafondWriting instrument with silent clicker mechanism
WO2003101757A3 *May 29, 2003Feb 5, 2004Luc Marcel LafondWriting instrument with silent clicker mechanism
U.S. Classification401/111, 401/112, 401/93
International ClassificationB43K24/02, B43K24/00
Cooperative ClassificationB43K24/023, B43K24/02
European ClassificationB43K24/02A, B43K24/02