US606765A - Manufacture of rubber-faced type-wheels - Google Patents

Description

No. 606,765. Patented'luly 5,1696. 1. s. 06min.

MANUFACTURE 0F RUBBER F`ACED TYP-E WHgEELS. (Applcntion med June 25, 1897.) (No Model.)

2 Sheets-Sheet I.

No. 606,765. Patented July 5, |698.

1. s. '06m-:M v MANUFACTURE 0F RUBBER FACED TYPE-WHEELS.

' (Application led June 25, 1897.)

'- (Nofmodem 2s 11111 S-sheetz.

Ai, wza ffy/f y UNITED STATES PATENT EETCE.

JOHN s. OGDEN, OF BROOKLYN, NEw YORK.

NINUFACTURE OF RUBBER-FACED TYPE-WHEELS.

SPECIFICATION forming part of Letters Patent No. 606,76 5, dated July 5, 1898. Application filed J une 25, 1897. Serial No. 642,280. (No modell) T LZ whom t muy concern,.-

Be it known that I, JOHN S. OGDEN, of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in the Manufacture of Rubber-Faced Type-Vheels, of which the following is a specification, reference being had to the drawings accompanying and form-` ing a part of the same.- l

The invention which forms the subject of my present application for Letters Patent is an improvement in apparatus for the manufacture of rubber-faced type-wheels-such as are employed in printing-telegraph instruments, type-writers, and the like-or, in general, any article which possesses the essential characteristics of a type-wheel in being a circular or cylindrical body having a peripheral surface of vulcanized india-rubber with distinctive characters embossed thereon.

It has heretofore been a matter of considv erable difficulty and expense to produce a ties and complications heretofore encountered.

in such manufacture and have devised apparatus for producing these devices cheaply and accurately.

My improvement consists in an apparatus involving as its chief characteristic a flexible or resilient matrix-strip which is adapted to v be applied to a type-wheel faced with crude india-rubber in such manner that the latter will be enfolded within the strip and the rubber forced into the depressions in the said strip, and the strip is of such character or' composition that the rubber facing may beV vulcanized while thus encircled by the strip and the latter then unfolded and detached. In conjunction with the strip VI employ suitable means, preferably of the special charac-` ter hereinafter more fully described, for compressing the strip around the rubber-faced wheel during the process of vulcanization.

I now refer tothe drawings for a description of my improvement and of the manner of producing and applying the matrix.

Figure l is a plan view, with a portion of -the cover removed, of the device which I emvplan View ofthe mold for the type-wheels.

Fig. '7 is a central longitudinal vertical section ofA the same. Fig. 8 is a plan view of a type-wheel previous to the formation of the characters, and Fig. 9 shows the complete wheel.

The lirst step necessary in carrying out the invention is .to produce adie or what is usually termed an original wheel, with characters on its periphery corresponding to those which are to be ultimately formed on the rubber facing of the type-wheels. This die I make as shown in Figs. l to 4. It is composed of metal with top and bottom plates ce a and eight intermediate sections with a hole through the center equal'in diameter to the width of the four sliding or radial sections Z) o. The die is held together by screws o and forms a practically solid ring with the 'raised characters cut on its periphery. From this die I forma matrix as the next step in the following manner:

0A is a metal box containing two sliding Y blocks A', recessed at their ends and adj ust able by means of a set-screw B and a clamping-screw B'. .In the bottom of the box is a hole through which is passed a centering and steadying pin C. O ver this is passed the sectional die, which rests upon a boss or circular elevated portion (1Q-which serves as acentering-support for the, matrix-mold. This latter is a met-al ring D, which is fitted over the boss C around the die. Around its upper edge notches D are out to form passages for the metal into the mold. A cover E is then placed over the mold, having notches D" in its edge registering with notches D'. The

box A is then closed by a cover `A,faste ned by screws a and having an opening with a threaded bushing E',the beveled end of which abuts against the correspondinglybeveled IOO edge of the cover E and centers and clamps firmly in position the die and the mold. The opening in the cover A"l is then closed by a cover E, having a tube F passing throughit and extending upward for perhaps two or three feetin order that when the molten metal is poured down through it into the mold there may be sufficient pressure to force the said metal into all parts of the mold and prevent air-holes.

The metai used for the matrix may be typemetai or any other suitable for the purpose which has a certain amount of resiliency or flexibility. \Yhen it has been poured into the space above the cover E, it runs down through the passages provided therefor into the annular space between the die andthe mold, filling such space, as shown in Fig. 3.

After the metal has cooled, the casting or matrix, with the sectional die, is removed from the mold, the end plates oi' the die detached by loosening the screws c, andthe die then taken out by sections, which may be accomplished by first pushing out the center ping C and then sliding` the radial sections Z) toward the center, as shown in Fig. 4t. The matrix G will then be in the form of a ring. This is split, as shown in Fig. 5, and secured to the inside of a split metal ring or backing G', which has sufficient resilience to open slightly when not under pressure.

The next step is to mold the characters on the rubber facing of the type-wheels. For this purpose I use the same box A or one similar to it. 'lhe type-wheel or type-wheels N have a strip of unvulcanized rubber li wound around their peripheries, as indicated in Fig. 8, and are placed over a centeringspindle K. In order to prevent movement or displacement of the wheels, they are strung on the spindle K, together with a number of metal washers L, and the enlarged lower end of the spindle inserted in the holein the bottom of box A. The split ring G', with the matrix attached thereto,is then placed around the typewheels and the blocks A adjusted by the screws B B so as to compress the ring G until its edges closely abut. The diameter of the boss C should be just equal to the internal diameter of the ring G when closed, so as to center the latter and distribute the pressure upon the rubber faced wheels evenly. A screw plug M, through which passes the centering-spindle K, is then in i serted in the opening in the cover A and screwed down upon andinto the ring G. ily this means a heavy and even pressure is applied to the soft and cru de rubber,wliich forces it into the recesses in the matrix. After this has been done and as the filial step the box A and all its contents are subjected to a temperature sufficient to vulcanize the rubber facings of the type-wheels, after which the parts of the mold are detached. As soon as the pressure of the blocks A upon the split ring G is relieved the latter opens and the rubber facing of the type-wheels strips oft from the matrix. rlhe finished wheels, as shown in Fig. f), may thus be readily detached from their matrices.

Type-wheels prepared in this way are remarkably exact and print a clear record. The cost of manufacture is very greatly reduced and the difficulty experienced in the use of sectional molds entirely avoided.

XVhat I claim as new, and desire to secure by Letters Patent, is-

l. A resilient or flexible matrix for making rnbber-faced type-wheels adapted to be folded or wrapped around the rubber-faced wheel and to compress the crude rubber when completely encircling the same, as set forth.

A resilient or flexible matrix for making rubber-faced typeAwheels,adapted to be folded or wrapped around the rubber-faced wheel and to compress the crude rubber when completely encircling the saine, in combination with means for holding the matrix in position on the wheel while the rubber is undergoing vulcanization, as set forth.

3. A matrix for rubber-faced type-wheels in the form of a resilient split ring` adapted to encircle the rubber-faced wheel, as set forth.

i. The apparatus for making rubber-faced type-wheels comprising in combination, a box A, blocks A adjustable therein, and a splitring matrix, adapted to encircle a rubber faced wheel and to be compressed thereon by the blocks A', as set forth.

5. The combination of the box A, the adjustable blocks A', the split-ring matrix, the centering-spindle l( andthe screw-plug M, as set forth.

JOHN S. OUDER lVitnesses:

M. Lawson Dvnn, B. M1 LLnn.

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