US395365A - Apparatus for forming abrading-wheels - Google Patents

Description

(No Model.) A

W. H. TAGGART. APPARATUS FOR FORMING ABRADING WHEELS.

No. 395,365. Patented Jan. 1, 1889.

NITED STATES rricn.

PAFNT APPARATUS FOR FORMING ABRADING WHEELS.

SPECIFICATION forming part of Letters Patent No. 395,365, dated. January 1, 1889..

Serial No. 253,671. (No model.)

To aZZ whom it may concern.-

Be it known that I, \VILLIAM ll. TAGGART, a resident of Freeport, in the county of Stephenson and State of Illinois, have invented certain new and useful Improvementsin Apparatus for Forming Abrading-\Vl1eels; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention is an improved device for forming abrading wheels or cutters directly upon their shafts. It fully illustrated in the accompanying drawings, in which-- Figure 1. shows a side view of the entire apparatus. Fig. 2 is a view in the direction of the arrow of Fig. 1. Fig. 3 is an enlarged section on the line 1 Fig. 1. Fig. 4C is a section on. the line :r'y, Fig. Fig. 5 is a section similar to those shown in Figs. and 4, illustrating a slight modification in construction, for purposes hereinafter set forth.

In the drawings, A A are handles, and 'D I) are corresponding jaws pivoted together at U and thrown open by a spring, 13, in the usual manner. The jaws are perfm'ated, and in them are )laced, respectively, a steel ma trix, If, and a steel pressm'ebloclt, G. Both matrix and block are n-ovided with shoulders resting upon the face of the jaws, respectively, and with integral] formed shafts .T K, fitting the perforations in the jaws. The inner surface of the block is plane and at right angles to the axis of the shaft K, which, when the forceps are closed, as shown, is in line with the axis of thcmatrix II and its shaft J'. The inner end of the matrix-head H is provided with a recess of the form desired for the emery-wluml, and is beveled from the outside toward this recess to :form a sharp cuttingedge, all whose points may meet the face of the block G when the forceps are closed, the (-m1structi0n of the jaws being such that in this position their inner faces are at a distance from each other just equal to the combined lengths of the block G and matrix II, exclusive of their shafts.

The shaft .T is centrally perforated in the direction of its length, and in this perforation placed a shaft, I, whose roughened end porface of the block (it.

tion, P, projects to any desired distance into the depression L in the matrix-heenl II. A set-screw, F, working in the jaw I), passes through a suitable opening in the shaft J and secures the shaftI in any desired position, and a set-screw, F, in like manner fastens the shaft K. If, now, a piece of an emery or corundum wheel, or of any similar substance, be warmed until it reaches a plastic state and be then placed in the matrix, closing the forceps will :force itinto every part of the recess, including the slight depressions in the surface of the shaft I, and the surplus material, if there be any, will be neatly and cleanly separated from the portion within the matrix by the cutting-edge as the latter meets the sur- The mass being then cooled afterward removed from the matrix as a perfect disk perfectly mounted upon the shaftI and ready for use in the dental cngine.

It is plain thatnmtriees of any desired form may replace the frusio-conical matrix shown, and that the face of the block G may be provided with a depression or projection of such form that the outer face of the completed wheel may be jn'ojecting or re-entrant, and, further, it is evident that a great vi'iriety of matrices. may be used without sul'istituting another block for the plane-'facml block G, (shown in the drawings) the size of the wheel to be formed being limited only by the size of the plane pressure-surfacc.

For some purposes it is necessary that the portion of the shaft I ncarthc cutter or wheel mounted upon-it be much smaller than it is practicable to make the body thereof, it being desirable that the entire series of wheels may be used in the same shaft-llo'lder. Two difficulties are then presented; The shaft is too small to. afford secure attachment for the wheel, and the material of which the wheel is formed is forced into the space surrounding the small portion of the shaft and must be removed after the wheel is completed. The

shaft is therefore provided with an end disk, 0, Fig. 5, at least equal in diameter to the diameter of the main portion of the shaft, and this, whatever the form of the matrix, ahvays covers or fills the perforation in the bottom thereof and prevents the plastic substance from passing into the space about the small portion of the shaft. It may be remarked that this space is necessary in order that the same matrix may be used with either shaft, and that the shaft may be removed longitudinally when the corundum disk has been formed upon its extremity. Making the jaw D in two parts attains one 011' these objects, but not the other.

I have forced the matrix and pressureblocks togeth er by various other deviees-e g., by a screw and by a cam moving" either one in the line of its axis; but I prefer the method illustrated as essentially the same, but more convenient and rapid in operation.

Having now fully described and illustrated the construction and operation of my invention, what I claim as new, and tiOSilO to seeure by Letters Patent, is

1. In a device for forming abradlug-wheels 1 directly upon their shalts, the combination, 1

with two eoaeting jaws, of a pressure-block attached to one of said j aws, a matrix attachml to the other jaw and having a cutting-edge adapted to bear upon said pressure-block, and i an axial bore adapted to receive a shaft, and

- means, substantially as shown and described, for securing a shaft in the bore of said matrix during the formation of an abrading-wheel, sul'istantially as and-for the purpose set forth.

2. In an apparatus for forming abradingwheels directly upon their shafts, the combination, with two suitably-bored coacting jaws, ot' a pressure-block having a shank removably seated in the bore of one of said jaws, an axially-bored matrix having a shank removably seated in the other of said jaws and formed with a transverse opening, and a transverse set-serew seated in said last-named jaw and adapted to pass through the transverse openingin the shank ef the matrix and to secure a shaft in said shanle and at thesametime to secure the shank in the jaw in which it is seated, substantially as and for the purpose set lori h.

In testimony whereof I have signed this specification in the presence of two subscribingwitnesses.

WILLIAM ll. 'FAGGART.

\Yitncsses:

C. W. irRAHAM, G. H. Parrisom.

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