US2427033A

US2427033A - Mechanical ink pencil

Info

Publication number: US2427033A
Application number: US558144A
Authority: US
Inventors: John C Wahl
Original assignee: Eversharp Inc
Current assignee: Eversharp Inc
Priority date: 1944-10-11
Filing date: 1944-10-11
Publication date: 1947-09-09
Anticipated expiration: 1964-09-09

Description

p 9, 1947. J. C.IWAHL 2,427,033

MECHANICAL INK PENCIL- Filed Oct. 11, 1944 3 Sheets-Sheet 1 I' I. j N

I I 1 I I i s I I 3 ts i r Q (E Lg) & Q I v 4\ I I m1 I & F i

Q Q Q 1 INVENTOR. Joimcwaizz,

J. C. WAHL MECHANICAL INK PENCIL Sept. 9, 1947.

5 Sheets-Sheet 2 Filed Oct. 11; 1944- INVEN TOR. Jahn C Wald Il /ll;

Sept. 9, 1947.

J. c. WAHL MECHANICAL INK PEN-GIL Filed Oct. 11, 1944 a Sheets-Sheet a lliliu \Y vivid! .within the scope Patented Sept. 9,, 1947 T orr ca MECHANICAL mx ranch. John C. Wahl,.Chicago, Ill., assignor to Eversharp, Inc., Chicago, Ill.,

ware

a corporation of Dela- ,Application October 11, 1944, Serial No. 558,144

4 Claims. (Cl. 120-42) The present invention relates to mechanical ink pencils of the type in which the ink used is of paste-like semi-fluid consistency and is transferred to the sheet of, paper or other material by a small ball which is rotatably mounted in the tip.

The principal purpose of the invention is to provide a writing implement of the type described having an ink reservoir of new and improved construction.

In my copending application, serial No. 553,515, filed September 11, 1944, I have disclosed and claimed a writing implement of the same general character in which the reservoir for the ink consists of a long tortuously arranged capillary passage, which passage is connected at one end with the tip containing the ball and is left open at the other end.

In the present disclosure the improved reservoir consists instead of a plurality of separate open-ended capillary passages, which passages are each adapted to direct the ink held within the same forwardly to a common outlet leading to the ball.

One of the objects of the invention is to provide an ink reservoir containing a plurality of separate open-ended capillary passages for the retention of the ink.

Another object of the invention is to provide an ink reservoir of the capillary passage type in which the member containing the passages forms the barrel proper of the writing implement.

Still other mor specific objects and advantages of the invention will be apparent to those skilled in the art upon a full understanding of the construction, arrangement and manner of use of the parts forming the writing implement.

A few embodiments of the invention are presented herein for the purpose of exemplification, but it will of course be appreciated that the invention is susceptible of incorporation in still other structurally modified forms coming equally of the appended claims.

In the accompanying drawings:

Fig. 1 is a side view of a writing implement constructed in accordance with the invention, with the cap shown in longitudinal section;

Fig. 2A is a longitudinal section through the front portion of the writing implement;

Fig. 2B is the same section through the remainder of the writing implement;

Fig. 3 is a transverse section, taken on the line 3-3 of Fig. 2A;

Fig. 4 is a transverse section, taken on the line 4-4 of Fig. 2A;

, action. The ink is fed to Fig. 5 isa transverse section taken on the line 5-5 of Fig. 2B;

Fig. 6 is a transverse section through a modified form of the reservoir;

Fig. '7 is a longitudinal section through a modified form of the tip;

Figs. 8A and 8B are views which correspond generally to Figs. 2A and 2B but show a modified barrel construction in which the capillary passages are formed in a separate cartridge member; and a Fig. 9 is a side view of the cartridge, including the end caps which are adapted to be applied to the cartridge prior to its installation in the barrel.

Referring first to the construction shown in Figs. 1.120 5, inclusive, it will be, observed that the same includes primarily a head II], a tip II which contains an ink transferring ball I2, an ink reservoir I3 which forms the barrel proper of the writing implement, and a cap I4 which forms an enclosure for the rear end of the reservoir I3.

The head III is of forwardly tapering shape and contains a longitudinally extending bore I5 through which the ink passes in advancing from the reservoir I3 to the tip I I. The tip I I is mounted in the front end of the head Ill and contains a longitudinally extending bore I6 in register with a reduced continuation ll of the bore I5. The bore I6, which is of quite small diameter, opens forwardly into the center of a small socket I 8 in which the ball is mounted. The socket I8 opens forwardly, and the ball I2 is held in the same in a partially projecting position by a fine inturned annular edge I 9. The ball I2 is rotatably mounted in the socket I8, between the annular edge I9 and an annular shoulder 20 present between the bottom of the socket and the front end of the bore I6.

The ink used in the writing implement is preferably of a paste-like semi-fluid consistency and is designed particularly for feeding by capillary the rear surface of the Movement of the writball I2 in contact with upon causes the ball to ball I2 from the bore I6. ing implement with the the surface to be written rotate within the socket I8, transferring the ink from the ball onto such surface in a thin quick drying film, much after the fashion of ofiset printing.

The head III is provided at its rear end with a rearwardly opening circular recess which is screw-threaded at 2| for the reception of the front end of the reservoir I3. The front end of the reservoir is reduced in diameter and is exteriorly screw-threaded at 22 for engagement 3 within the head. The reservoir is a sin le rodlike member of generally cylindrical shape which constitutes the barrel proper or the writing implement and is arranged with its outer surface substantially flush with the outer surface of the rear end of the head ll.

The reservoir it contains a plurality of separate longitudinally extending bores 23 which are arranged in more or less uniformly spac parallel relation to each other. These bores constitute capillary passages in which the supply of ink is retained. All of the assages open at their front ends into a relatively large circular recess N, which recess is formed in the front end of the reservoir and opens forwardly into the bore I! present in the head II. All of the passages extend rearwardly through the rear end of the reservoir and are leit open.

The rear end of the reservoir I3 is reduced and exteriorly threaded at 2! for the reception of the cap ll. The cap I4 is hollow and is cupped forwardly with its bottom 28 in rearwardly spaced relation to the rear end of the reservoir. The rim of the cap H is interiorly screw-threaded at 21 for engagement with the rear end of the reservoir. If desired, the can can be provided at some point with a minute atmospheric vent l4, but the addition of such a vent is not necessay in view of the character of the connection between the rear end of the reservoir and the cap.

The writing implement is provided with a cap II for enclosing and protecting the writing point. The cap 2| may be of any suitable construction. It is shown as provided with aninsert 29 which wedgingly seals at 30 against the head iii. The rim of the cap is provided with a screw-threaded portion Ii which engages with screw threads 32 formed on the outer surface of'the rear end of the head.

The reservoir It can be readily filled by removing the cap it and forcing the ink forwardly through all of the passages 23 in the reservoir until such passages, together with the recess 24 and the bores it, It and ii, have been completely iilled. The reservoir, if desired, can be removed from the head It when empty and replaced by another full reservoir. The capacity or the passages 23 in the reservoir is preferably such as to permit the writing implement to be used for a long period of time, say six months or a year,

before having to refill or replace the reservoir.

In Fig. 6 a modified reservoir I3 is shown in moved for the purpose of replacement, cleaning 65 1,179,086

or repair.

9 the writing implement is provided with a separate readily applicable cartridge it in which the open-ended capillary tubes 3' are formed. The cartridge llfltsintoasurroundlngbarreil'lwhich is threaded onto the head ii. The ends of the cartridge 3' are adapted to he slid oi! prior to insertion in the barrel by screw threaded end caps I! and II.

I claim:

1. In a writing implement for use with paste type ink, a tip having a longitudinally extending bore,abailrotatablymountedinthetipatthe front end of the bore. and a reservoir for the ink characterized by a plurality of separate capillary passages, eachot whichis open atoneendtothe atmosphere and is connected at its other end with said bore, said passages being distributed throughout the cross-sectional area of the reservailr in spaced generally parallel relation to each 0 er.

2. In a writing implement for use with paste type ink. a tip having a longitudinally extending bore, a ball rotatably mounted in the tip at the front end of the bore, and a reservoir for the ink characterized by a plurality of separate capillary passages, each of which is open at one end to the atmosphere and is connected at its other end with a common outlet opening into said bore, said passages being distributed throughout the cross-sectional area of the reservoir in spaced generally parallel relation to each other.

3. In a writing implement for use with paste type ink, a tip having a longitudinally extending bore, a ball rotatably mounted in the tip at the front end of the bore, and a reservoir for the ink characterized by a plurality of separate capillary passages, each of which is open at one end to the atmosphere and is connected at its other end with a common outlet opening into said bore, said reservoir being elongated, and said passages bein arranged lengthwise of the reservoir in spaced generally parallel relation to each other.

4. In a writing implement for use with paste type ink, a tip having a longitudinally extending JOHN C. WAHL.

ngrmmvcss crrim The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,327,729 Paschal Jan. 13, 1920 Foster Apr. 11, 1916 1,493,680 Koepsell May 13, 1924 1,527,971 Forsell Mar. 3, 1925