US334785A - T hekry la bait - Google Patents

Description

(No Model.)

J. H. LA BAU.

TELEGRAPH CALL BOX. No. 334,785. Patented Jan. 26, 1886.

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NITED STATES PATENT OFFICE.

JOHN HENRY LA BAU, OF NEW YORK, N. Y., ASSIGNOR TO THE NE\V HAVEN CLOCK COMPANY, OF SAME PLACE.

TELEGRAPH CALL-BOX.

sPECIPICATIOIQ' forming part of Letters Patent No. 334,785, dated January 26, 1856.

Application filed February 6, 1885. Serial No. 155,118. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN HENRY LA BAU, a resident of New York city, in the county and State of New York, have invented an Improved Telegraph Gall-Box, of which the following is a full, clear, and exact description, reference being made to the accompanying drawings, in which Figure 1 is a central section of my improved telegraph call-box. Fig. 2 is a face view of the same. Fig.3 is a detail sectional view of the appliances for shaping the same. Fig. 4. is an enlarged sectional View of part of said box.

This invention relates to a new construction of call-box for telegraphic purposes-such as messenger-calls, &e.such boxes being made of plastic composition. The composition itself is not part of the present invention, as it has already been utilized for sundry purposes in the arts; but it is one that is rendered plastic by heat, analogous, therefore, to sealing-wax or other well-known non-conducting substance.

My invention consists, principally, in a box which has the inscriptive letters and characters formed of the non-conducting substance of the box, but in different color from the rest or body of the box, so that such letters shall project from the face of the box, and be throughout their entire thicknesses of this different color.

In the drawings, the letter A represents the back of my improved call-box. B is the cylindrical shell of the same, and O is its face or front. These three parts A B O constitute the body of the box, and are of suit-able size and shape. They are, by preference, joined by screw-threads; but the call-box, instead of being made in three parts, may be made in two parts, if desired.

On the outer side of the face-plate 0 appear the letters and words that are shown at a in Fig. 2. These letters or words it is the intention of my invention toform on the face of the box out of the non-conducting substance thereof, but throughout of different color, so that the lettering of the box by hand may be avoided, and so, also, that if a portion of a letter should chip off, that part of the letter beneath will still have the different tint. In order to produce this effect, I prepare a plate, D, (see Fig. 3,) in the face of which are engraved to the proper depth the letters a, that are produced on the face 0. Into the cavities thus produced in the plate D, I insert the composition, preferably in a finely powdered state, so that the cavities for theseletters shall just be filled with this composition. The nonconducting composition that is inserted into these cavities has the color of which it is desired to produce the letters on the box. Heat is now applied to the plate D, so as to melt the particles of the composition, thereby filling the cavities with the solid letters. These are then allowed to cool and become hard. After this the plate D is made use of as the bottom of a mold, E, into which mold is in serted the composition for the plate 0, which composition is ofthe same character and kind as that used in filling the letters, but of a totally different color. In practice I prefer to make the body of the plate Gblack and the letters a a red. Vhen the composition O is in the mold D E, heat is again applied, thereby remelting the contents of the cavities of the plate D, and also melting the substance of the contents of the mold, the effect being that when afterward the mold is chilled the letters a a, throughout of red color, will adhere to the face of the black plate 0.

By first letting the letters harden and then filling in the plastic composition for the body of the plate 0, I prevent the two mixtures blending and forming uncertain outlines for the letters.

It will be seen that should any part of a letter a break off the rest of the letter behind the broken portion will still show the red color, thereby allowing the proper form of such letter to be still displayed. It will also be seen that the letters (6 a project from the face of the plate 0 of the box, and that they are therefore readily read and seen, even from the side.

The particular advantage of this invention is, that a box thus produced need not have the lettering painted nor stenciled on, thus saving considerable hand-labor, and also that the letters are far less destructible than those which can be painted or stenciled onto such plate being constructed with the projecting a box, and that the entire box, together with letters a, the whole being composed of the its lettering, will be of non-conducting subsame kind of plastic composition, but the stance. composition of the letters being of different 15 The process herein described will be made I color throughout from the composition of the the subject of another application for a patent. face of the box, substantially as herein shown I claimand described. As a new article of manufacture,.the tele- JOHN HENRY LA BAU. graph call-box composed of the non-conduct- Witnesses: :0 ing back A, non-conducting cylinder 13, and i CHARLES G. M. THOMAS,

non-conducting face-plate C, the said face- HARRY M. TURK,

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