US394246A - Stop-knob - Google Patents

Description

(No Model.)

M. CLARK.

STOP KNOB. No. 394,246. Patented Dec. 11, 1888.

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MELVILLE CLARK, OF CHICAGO, ILLINOIS.

STOP-KNOB.

SPECIFICATION forming part of Letters Patent No. 394,246, dated December 11, 1888.

Application filed April 27, 1888. fierial No. 272,028. (No model.)

To all whom it may concern.-

Be it known that I, MELVILLE CLARK, a citizen of the United States, residing at Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Stop-Knobs, which are fully set forth in the following specification, reference being had to the accompanying drawings, formin a part thereof.

In the drawings, Figure 1 is an axial section through a knob and its shank. Fig. 2 is a side elevation of the knob detached from the shank. Fig. 3 is an axial section of the shank with the knob detached therefrom. Fig. 4 is a side elevation of a knob of slightly-modified construction. Fig. 5 is a similar elevation with a further slight modification.

The purpose of this invention is to provide a knob of such form as may be made of porcelain, or of glass or like substances which cannot be readily worked after they are made, and whose surfaces or substances are of such character that glue or other adhesive cements will not adhere to them, and which, therefore, cannot be joined to their shanks by that means.

It consists in forming the knob with the usual head or body, A, having the stop-shoulder a, and, in addition, having protruding from the base end, and preferably from the center thereof, a tenon, A. This tenon may be of any shape, but is most conveniently made round, and is most convenient-1y attached when it is in this shape. The peculiar feature of it, however, consists in depressions a, formed in its surface. These depressions may be independent circumferential grooves, as shown in Fig. 2; or they may be a continuous spiral groove forming a screw-thread, as in Fig. 3; or they may be indentations of any form, and regularly or irregularly distributed over the surface, as shown in Fig. 4. These depressions serve the purpose of receiving any plastic ma terial which has a capacity for afterward hardeningas glue or plaster-of-paris or other eenientwhich is cemented in the socket B formed in the end of the shank B, before the knob is applied to the shank, by inserting its tenon A in said socket B. The size of the socket B should be substantially that of the tenon A, so that the tenon will fit snugly in the socket, but not so closely but that it may be thus inserted when it has been smeared with the cementing material sufficiently to fill the depressions a and leave a film on the surface. Having been thus inserted, the cenient, hardening, will adhere to the wood if it is of adhesive substance, as glue; and whether adhesive or not will form projecting rings or points or screw-thread, 2tC('()I'(llll L {i() the form of the depressions in the tenon. engaged in said depressions, and so prevent the tenon from being withdrawn and the knob being detached from the shank. I deem it preferable in some cases to form similar depressions, b, in the inner surface of the annulus of wood remaining about the socket B in the shank, into which similar projections of the cementing material will protrude and operate as a key engaging both partsthat is, the knob and the shankto prevent their separation. This construction is especially desirable, in that it permits the use of such material as porcelain or glass, which can be highly ornamented, and which cannot be secured to the shank by the ordinary methods which are suitable for wooden and metal knobs, the only method heretofore available being either to put a screw through from the face of the knob, which renders it unsuitable for a stopknob, or to secure a screw into the base by soldering the same; and this is objectionable, first, because the junction between the screw and the knob is not secure, and, second, because when the knob is tightened on the shank the name on the face will not always come into correct position, and in attempting to force it farther around, in order to bring the name right, either the knob becomes detached from the screw or the screw loses its hold in the wood, which it must enter lengthwise of the fiber; but by the construction which I have hereinabove described knobs of such material as porcelain and glass can be secured, so that when the cement is hardened they are unremovable, and are even more secure than a wooden knob would be if glued to the shank in the more usual manner.

As a precautionary measure, I form in the tenon A a transverse hole, a through which a pin, C, maybe inserted if it should ever become loosened in the shank. This hole being always made in certain exact relation to the horizontal and vertical diameter of the face of the knob, as determined by the name thereon, can always be found by drilling a hole at the shank to insert the pin, even if it is not so inserted when the knob is first attached. It may be more convenient in some cases, instead of locating the hole for the pin in definite relation to the name, to use some slight index-mark upon the margin of the base of the knob for the same purpose as indicated by the letter 0 on Figs. 2, 4:, and 5.

Of the several forms of depressions in the surface of the ten on, which are illustrated, the non continuous form of mere countersinks (shown in Fig. 5) I deem usually preferable, since that form of depression not only prevents the knob from being withdrawn longitudinally, but also prevents it turning in the shank, which latter result is not invariably obtained by circular or spiral grooves.

I claim 1. An organ-stop knob of porcelain or glass or like material, comprising the body and the tenon projecting from its base, and the shank having an end socket to receive the tenon, the

surface of the said tenon being formed with depressions a, the knob and its shank being secured together by plastic cement capable of hardening, placed in the socket and about the tenon, substantially as set forth.

2. An organ-stop knob of porcelain or glass or like material, comprising the body and the tenon A, having superficial depressions a, in combination with the shank having the end socket, B, the annulus of material of the shank which bounds said socket having formed on its inner surface depressions b, said knob and shank being secured together by plastic cement placed in the socket and about the shank, and entering the depressions in both, substantially as set forth.

In testimony whereof I have set my hand, in the presence of two witnesses, at Chicago, Illinois, this Jlth day of April, A. D. 1888.

MELVILLE CLARK.

lVitn esses:

CHAS. S. BURTON, JOHN R. NETTENs'rRoM.

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