US258299A - Writing-point for stylographic pens - Google Patents

Description

Patented May 23, 1882.

J. HOLLAND. WRITING POINT PONSIYLOGNAIHIG PENS. No. 258,299;

N, PETERS. Fhulnlimngrnpr. washington. \:|A c.

45 holder, or `by a loose spiral spring compressed y NITED STATES PATENT trice.

JOHN HOLLAND, OF CINCINNATI, OHIO.

WRIT|NGPO|NT FOR STYLOGRAPHIC PENS.

SPECIFICATION forming part of Letters Patent No. 258,299, dated May 23, 1882,

' Application filedl November 7, 1878. i

'To all whom it may concern I Ble it known that I, JOHN HOLLAND, of Gin-f writing-point for which Letters Patent No.

202,655 were granted to me April 23, 1878. The invention described in that patent was intended to furnish' a cheap iridium point for fountain-pens and obviate the necessity of boring or drilling the iridium.` This, while it gave a durable point, did not in use retain a per-y fectly smoot'hsurface, as the solder between the grains would wear and expose any sharp or uneven projections upon the grains of iridosmine. I have discovered a rapid process of drilling and constructing points for this class of pens ofone piece of Iridium, by which this defect in my former improvement is overcome.

Another defect in this class of pens is in the mode of securing the writing-point to the tube or holder. This consisted ot' a parallel Ycylinder, at the upper portion tapering to a smaller diameter to form a seat for the writingpoint, which was forced into this tube or holder. In

this mode of construction, it' the pen should fall upon the point, 4or it' in writing, to induce a iow ot' ink, the point was pressed or tapped hard upon the paper, the point would be dislodged and driven back. This defect I obvia-te by making my writing-point of a small parallel tube having the iridium soldered to the end, and a tube or collar of larger diameter soldered upon this tube, back of the iridium point, which forms a shoulder to rest against the lower Vend ot' the writing-point holder, and thus prevent the point from being driven in. Another defect which I remedy is in the mode of holding the gravitating valve to its seat. Formerly the valve was thus held by a rod which passed up through the air-tube, the upper end resting against an elastic spring or cushion in the cap at the top of the penbetween the end of the airtube and the valve. In the first of these, when the cap was loosened to admit air, the weight of the valve was depended upon to shut oft' the flow when the pen was removed from the paper. In practice it was found that in order to keep the duct free cinuati, Hamilton county,'and State of Ohio,

I it was necessary that the needle should constantly work back and forth in it. This voffice the weight ot' the valve would not perform after the cap was raised, and the loose spira-l spring,whcn used, was liable to become caught or be broken over from the side and destroy the usefulness of the pen. These defects I overcome by extending the valve to near the end of the air-tube, boring it out'centrally, and providing the bore with a spiral spring, the lower end of which .is secured within a tube made small enough to drop loosely within the cavity in the valve, the upper end of the spring projecting` far enough above the valve to rest against thecloscd lower end ot` the air-tube.

The invention which I desire to cover by this application consists of a point of one piece of iridium constructed bythe process hereinafter described.

It consists, also, in providing the pointt'ube with a. collar and securing the point to the lower end of the tube and collar.

1t consists, also, in the a1rangementofspring and valve for the purpose of closing the inkduct and facilitating the flow of inl; when the pen is in use.

In the accompanying drawings, forming part of this specification, Figure lrepresents uponan enlarged scale an axial section of a fountainpen embodying my improvements; but as my improvements relate wholly to the writingpoint the description will be confined to that part. Fig. 2 is a section ofthe valve or tube, taken at line fr rv, Fig. l.

A is the point-holder, consisting of a tube of rubber or other non-corrosive material. The upper end is screw-threaded externally to enter a tap in the handle, and the lower end is also threaded above the point to secure the cap o-r point-protector B. The bore of the holder A is large enough at the top to receive the valveG, and terminates in asmall bore, through which the valve-stem c passes. The point of the holder is eounterbored from the end to re ceive the tube D of the writing-point.

-The writing-point is constructed in the following manner: Grains of iridosmine of suita ble size are selected and soldered upon a plate of brass to be drilled. By using diamond-dust with a drill made of soft steel or copper, which is speeded up to about four thousand revolu-4 tions per minute, I am enabled to rapidly drill through the grains of iridosmine. These are then unsoldered from the plate and are ready to be attached to the point. Into the end of the tube D, to which the collar e has been tted, is inserted a soft-metal wire, leaving the end projecting out. Over this wire is slipped one of the perforated grains of iridosm'ine and then soldered to the end of the tube, as at F. The tube D of the writing-point is driven into the holder, the point dressed down to the proper size, after which the soft-metal wire is drilled out, ythus completing the point.

The valve which regulates the flow ofthe ink will now be described.

The lower edge of the tube U tits closely upon an offset in the point-hold-er, thus forming the valve, the offset forming its seat. The lower portion of the tube is turned 0E smaller in diameter than the bore in the point-holder A, and the upper portion is uted externally to permit the ink toreach the point, While the ridges left by the fluting serve as guides to steady th'e motion of the valve. In the lower eud of the tube U is a sere\vplng,-to which is attach-ed the valve-stem or needle c. Y The purpose of this is to regulate the flow of ink .and to compensate for the wear of the stem c. The plug can, by the insertion of a screw-driveriu its notch, be protruded or withdrawn, so as to lengthen or shorten the stem, as desired. A spiral spring, G, is secured by its lower end within a tube, H. This tube is dropped into the tube C, (which forms a valve,)vleaving the spring projecting above the upper edge of the tube C and pressing against the end ofthe air-tube. It will be seen by this arrangement all the parts can be made light, while being at the same time strong and durable, and can be readily regulated to suit the hand of the user, and taken apart for cleaning or repairs.

Theprocess described in the foregoing specification of drilling or perforatiug iridiuln tips is'not made the subject of a claim in this application; but I reserve the right to [ile a sepavrate application embodying vthis described process.

I claiml. rIhe tube D of a fountain-pen, tipped with a bored grain of iridosiniue, applied substan- 5o tially as specified.

2. In afountain-pen, the combination of the pen-holder A, tube D, collar c, and point F, constructed substantially as and for the purposev specified. 55

3. In afountaiu-pen, the combination, sub# stantiall y as specified, ot' the gravitatin g valve C, the needle-point secured thereto, the tube H and its spring G, saidv valve O being centrally'bored to receive the tube H and its 6o spring G,.for the purpose set forth.

4. The described method of constructing fountain-pens withnon-wearing Writing-points, which'consists vin inserting an easily-drilled core within the discharge-tube, leaving the end of the core projecting, placing the perforated writing-point over the projecting-end of the core, and ysecuring the parts together, after which the core is bored out and the'lwritingpoint dressed down to a cone shape.

5. A writing-point for fountain-pens, formed of a single piece of iridium perforated and ground to a cone shape, as described, in com-

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