US756652A - Means for making rubber type. - Google Patents

Description

No. 756,652. PATENTBD APR. 5, 1904. B. F. KERN & W. J. 0. JOHNSON.

MEANS FOR MAKING RUBBER TYPE.

urmonzon rILnn m. 2a, 1903.

no MODEL. 2 sums-sum 1.

PATENTBD APR. 5 1904. B. r. KERN & w. J. 0. JOHNSON.

MEANS FOR MAKING RUBBER TYPE.

APPLICATION FILED AUG. 28, 1903.

2 snnnrwsnm 2'.

H0 IODIIL.

VIZ?

I Ive/Em.

Patented April 5, 1904.

UNTTE STATES PATENT OFFICE.

BENJAMIN FRANKLIN KERN AND WALTER J. O. JOHNSON, OF CHICAGO, ILLINOIS; SAID JOHNSON ASSIGNOR TO HARRY S. FOLGER, OF CHI- OAGO, ILLINOIS.

MEANS FOR MAKING RUBBER TYPE- SPECIFIGATION forming part of Letters Patent No. 756,652, dated April 5, 1904.

Application filed August 28, 1903- To a, whom it may concern:

Be it known that we, BENJAMIN FRANKLIN KERN and WALTER J. O. JOHNSON, citizens of the United States, and residents of Chicago, Cook county, Illinois, have invented certain new and useful Improvements in Means for Making Rubber Type; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The object of the invention is to simplify the manufacture of rubber type by improvements in the apparatus used in making the same, comprising a matrix-holding plate of novel construction used in combination with an improved chase for forming the matrix and spacing-bars held from movement on the matrix-holding plate and providing a strong, simple, and durable apparatus so constructed as to insure the greatest accuracy and rigidity in molding.

The invention consists in the matters hereinafter described, and more fully pointed out and defined in the appended claims.

In the drawings, Figure 1 is a perspective view of a chase'embodied in our invention, showing the same inverted. Fig. 2 is a perspective View of a recessed matrix-holding plate. Fig. 3 is a similar perspective view of one of the spacing-bars, showing the same inverted. Fig. i is a transverse section of the chase with the type therein and also of the matrix-holding plate containing plastic material and showing the parts separated. Fig. 5 is a similar view showing the parts brought together in molding the matrix. Fig. 6 is a similar sectional view of the matrix-holding plate and the matrix therein with the spacing-bars in position. Fig. 7 is a similar view showing the matrix-holding plate with the rubber therein in the vulcanizer ready for vulcanizing. Fig. 8 is an enlarged detail of one corner of the matrix-holding plate with the matrix therein and the spacing-bars in position.

As shown in said drawings, A indicates a Serial No. 171,034. (No model.)

metal frame or chase, usually of cast metal and of the usual construction, adapted to hold the metal type or other raised printing-surface in the usual manner. Within the chase is provided a liner comprising bars of steel or other suitable material type-high in width and plain on one side for engagement with the type and on the'other side extended laterally, as shown in Figs. a and 5, providing a raised flat rib at, extending completely around the inner margin of the chase flush with the type-faces when secured in said chase and through which said bars are riveted to the chase. Said chase is provided with set-screws, as is usual, whereby the type is rigidly clamped in position therein in the usual manner, and a plate of steel (0 which, if preferred, can be integral with the adjacent rib a, is riveted to said end of the chase, thereby stiffening the chaseacross the end thereof. Dowels a are provided'at the corners of said chase and act to hold the 7 same in register with the matrix-holding plate.

B indicates as a Whole a matrix holding plate provided with a central recess corresponding in length and breadth with the external dimensions of the raised rib a of the chase A and of a depth slightly greater than the required thickness of thematrix, (indicated by X in Figs. 5 to 8, inclusive.) A raised rib b b is provided adjacent each end of said recess and each side thereof, as shown in Fig. 2, and parallel with the ends and sides of the recess, respectively, and form agage to indicate the quantity of plastic material for matrix to be filled into said recess previous to compression and also aiford a brace for the spacing bars. Between said ribs and the margins of the recess the face of said plate is planed down sufficiently to bring the surface below the outer face of the plate on the outer side of the ribs, and a plurality of threaded apertures are provided within said recess along the ends and sides thereof adapted for engagement with screw-bolts 6 by means of which said spacing-bars O are secured in po-.

sition therein. Apertures are provided at the corners of said matrix-holding plate complemental with the dowels a and adapted to bring the chase and matrix-holding plate into exact register when brought together, as shown in Figs. 4 and 5, and, as shown, a spiral spring a) is provided on each dowel and bears against the matrix-holding plate B when under compression and acts to lift the chase with its contents when the pressure is released.

The space-bars C, as shown, are four in number and fit closely in the ends and sides of the recess in the plate B, and are of a length to afford a tight joint at each corner, the same, as shown, being mitered together at the ends. Said space-bars are of a thickness equal to the desired thickness of the rubber type-sheet, and are of a width on the bottom equal to the width of the ribs on the chase and fit in the impressionmade thereby, and are provided at the top on the outer edge with an outwardly-directed relatively thin flange 0 of a width corresponding with the distance of the ribs 6 I) from the margin of the recess in said plate. Said spacing-bars are apertured to correspond with the threaded apertures in the bottom of the recess and are provided with transverse grooves in the top to permit excess of rubber to escape during vulcanizing.

The operation is as follows: The threaded apertures in the bottom of said recess in said matrix-holding plate having been plugged said matrix-holding plate is placed upon a suitable base of any desired kindas, for instance, the

bed of a press-and the matrix material X of any desired kind is filled into the recess in said plate in sufficient quantity to form a matrix of desired thickness under maximum compression, the quantity used usually about filling the recess to the top of the ribs 6 Z) before compression, as shown in Fig. 4. The chase, with the type or other relief surface therein which it is desired to impress upon the matrix, is next inverted over the matrixholding plate with the dowels a fitting into the complemental apertures in the corners of said plate, and pressure is applied upon the chase, compressing the plastic material to the desired consistency and a uniform thickness. After the matrix is formed the chase is lifted off, the springs aiding in lifting the chase, and if the matrix is not sufficiently hard for molding purposes the same is hardened in any appropriate manner 'to a condition sufiicient to receive the impression. The spacing-bars C are next secured in place by means of the screw-bolts, and inasmuch as the bottom of said spacing-bars or that portion contacting with the matrix is of the same width as the width of the rib a on the chase said bars fit closely in the impression made by said ribs (0. When in position, the outer flanges 0 of said bars bear against the ribs 56, which afford a rigid brace at the top of said spacing-bar against outward pressure. The rubber is next filled into said recess upon the matrix, and the matrix-holding plate is next placed in a vulcanizing-press D, as shown 5 in Fig. 7, and pressure applied in any desired manner, the thickness of the rubber molded being limited by the thickness of the spacebars, as shown in Fig. 8, thus insuring uniformity of thickness for the sheet. In vulcanizing excess material is permitted to escape from the mold through the grooves in the upper surface of the space-bars.

Inasmuch as the rib (0', together with the thickness of the chase, is type-high said ribs provide an impression in the plane of the typefaces and into which the space-bars fit. As the space-bars may, of course, be of any. thickness, the type-sheet may be made any preferred thickness, and where the same spacebars are used in molding it is obvious that the type-sheets formed from the several molds will be gaged accurately to the same thick ness. Furthermore, inasmuch as said ribs 7) b afford a positive bearing for the flanges of said space-bars above the center of the same it is evident that no lateral displacement of said space-bars by canting or tipping can occur during the compression or vulcanizing of the rubber.

Obviously instead of ribs on the matrixholding plate projections of other form may 4 be used adapted to be engaged by projections carried on the spacing-bars, and many details of construction may be varied without departing from the principles of our invention.

We claim as our invention- 1. In an apparatus for molding rubber type the combination with a chase having a raised rib extending around the inner margin of the same with its face in the plane of the typefaces, of a matrix-holding plate havinga central recess of a Width and length to receive said raised rib of the chase and adapted to contain plastic material, a rigid projection adjacent each margin of said recess, spacingbars fitted within the recess, a projection on the outer side thereof adapted to bear against the projections on the matrix-holding plate and interfitting means on said chase and matrix-holding plate adapted to bring the same into register.

2. An apparatus for molding rubber type comprising a plate having a central recess to receive matrix material, a raised integral rib in proximity with and at each side and each end of the recess and extending parallel with the same, spacing-bars adapted to fit into the sides and ends of the recess and bearing with their outer margins above their centers against said ribs and a chase provided on its type side with a raised rib extending around its inner margin having outer dimensions complemental with the recess in the matrix-holding plate and having a width approximately equal to that of the bottom of the spacing-bars and interfitting means on said matrix-holding plate and chase adapted to bring the same into register.

3. In a device of the class described the combination with a recessed plate adapted to receive the matrix material, of one or more raised projections on the face thereof arranged near the sides and ends of the recess, said plate being reduced in thickness between said projections and the recess,spacingbars fitting closely in the sides and ends of the recess and affording raised sides and end walls therefor and outwardlyprojecting portions in the plane with their upper surfaces adapted to bear against the projections on the plate, a chase, a raised rib on the face thereof the height of which together with the thickness of the chase is approximately equal to the length of the type to be secured therein, said ribs fitting closely in the recess in said plate and having a width equal to the bottom portion ofthe spacingbars and means acting to bring said chase and matrix-holding plate into register. 4. In a device of the class described the combination with a chase, of a raised rib around the inner margin thereof extending type-high on the chase, a recessed plate adapted to receive plastic materialsuitable for amatrix and into which the ribs of the chase fit closely, means acting to bring said plate and chase into register adapting the matrix to be formed by compression thereby,said rib affording a plane margin surrounding the matrix, spacebars having a width on the under side equal to the width of said ribs and adapted to be rigidly secured within said recess covering the plane margins of the matrix and a flange at the top of each spacing-bar adapted for positive bearing on said plate and holding said bars from displacement.

5. In a device of the class described the combination with a matrix-holding plate having a shallow recess therein adapted to contain a matrix, of space-bars fitting closely in the sides and ends of the recess and affording raised side and end walls for the mold, means adapted to secure the space-bars to the matrix-holding plate and mutually engaging projections on said space-bars and plate acting to hold said space-bars from displacement.

6. The combination with a recessed matrixholding plate, of a raised rib adjacent said recess and on each side and end thereof, spacebars adapted to fit in said recess, projections at the top of each space-bar adapted to bear against said ribs and to hold said bar from outward displacement whereby said space-bars afi'ord rigid side and end walls above the matrix adapted to receive within the same material for type and said space-bars having flat transversely-grooved upper faces adapted in vulcanizing for engagement by the platen of the vulcanizing-press and acting to limit the compression of said material in the mold by contact with the space-bars.

7 In a device of the class described the combination with a recessed plate adapted to receive matrix material of a chase, an inner lining for the chase permanently attached thereto and affording a raised rib type-high on the face of the chase adapted to fit into said recess in the plate and afford a plane margin for the matrix and space-bars adapted to be secured on said matrix and parts thereon above the center thereof adapted to hold said bars from slipping under outward pressure.

8. Inadevice of the class described the combination with a chase, of an inner steel lining permanently secured thereto and having a flange extending outwardly over the face of the chase affording a raised flat rib surrounding the inner margin of the chase type-high.

9. In a device of the class described the combination with a recessed plate adapted to re ceive a matrix, of a raised rib adjacent to the sides and ends thereof, a shoulder about the margin of said recess parallel with said ribs, a chase, a rib type-high on the face thereof adapted to fit closely between said shoulders and form a flat margin about said matrix, space-bars adapted to seat in said flat margin and provided with laterally-extending flanges adapted to contact with the ribs of said plate and means for rigidly securing said spacebars in position.

10. In a device of the class described a chase, an inner lining rigidly engaged thereon and affording a raised rib on the face of said chase, a matrix-holding plate having a recess therein adapted to fit closely about said ribs, a rib at the sides and ends of said recess and parallel therewith, the margin of said plate being lower at the inner side of said rib than at the outer side thereof, space-bars adapted to seat within said recess and provided with a lateral projection adapted to contact with the ribs on said plate, and means for bringing said chase and plate into register with each other.

11. A matrix-plate comprising a plate having a centralshallow recess and a flat margin about said recess, said margin being lower at its inner edge than its outer edge and an upwardly-extending rib on said margin parallel with the sides and ends of the plate.

In testimony whereof we have hereunto subscribed our names 1n the presence of two subscribing witnesses.

BENJAMIN FRANKLIN KERN WALTER J. O. JOHNSON.

Witnesses:

C. W. HILLs, A. C. ODELL.

Images