US503198A - Knob attachment - Google Patents

Description

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(LT; DOEBLER 8v 0. K, BRYANT.

KNOB ATTACHMENT.

1 T( .'503,198. Patented Aug. 15, 1893'.

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NITED STATES PATENT OFFICE.

CHARLES F. DOEBLER AND CHARLES K. BRYANT, OF HARTFORD, CoNNECTICUT.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 503,198, dated August 15, 1893.

Application filed June 28, 1892. Serial No. 438.307. (N model.)

To all whom it may concern:

Be it known that we, CHARLES F. DOEBLER and CHARLES K. BRYANT, citizens of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Knob Attachments, of which the following is a specification.

This invention relates to that class of knobattachments in which the knob is secured to the spindle by means of clamping devices; the object being to provide a knob-fastening fixable to the spindle through an intermediate spindle-clamping thimble, or sleeve, whereby the knob-stem may be firmly held at the knob-end thereof, as hereinafter more fully set forth.

In the drawings accompanying and forming a part of this specification, Figure 1 is a longitudinal section of a knob-attachment embodying our present improvements. Fig. 2 is a similar sectional view, showing a modification of certain details. Fig. 3 is a sectional view, in line a a, Fig. 1. Fig. 4. is a side view of the knob-carrying sleeve, or thimble, through which the squared spindle is fitted to slide.

Similar characters designate like parts in all the figures.

In our improved knob-attachment, the spindle S is or may be of the usual squared crosssectional form shown in Fig. 3, and of uniform diameter throughout the length thereof.

On this spindle is fitted the spindle-clamping sleeve 2, centrally perforated throughout the length thereof by a squared hole fitting freely on the spindle S. One end of said sleeve 2, which is externally round in cross-section, is threaded at 3; and the other end, 4, thereof is formed tapering; said sleeve is also slotted at one or more points (in the present instance at four points, as shown at 5 in Fig. 3) for the greater part of its length, so that said conical end 4. may be closed onto the spindle.

The knob K is furnished with a tubular knob-stem, 6, the knob-end of which stem is bored tapering to fit on the aforesaid conical end 4 of the sleeve while the projecting end of said stem is bored and threaded to screw onto the thread 3 of said sleeve. As a means for holding the knob-stem in place on the sleeve, the latter member is also provided with a check-nut, 7, (which may have the usual hexagonal form at 8,) screwed upon said threaded portion 3 and bearing against the extreme end of said stem 6, as will be understood by inspection of Fig. 1.

When assembling the knob-attachment, the spindle is put through the doorD and the escutcheon-plate P (Fig. l) and the sleeve with the check-nut 7 thereon is then slid upon the spindle and against the escutcheon-plate, as shown in said Fig.1. The knob-stem is now, by means of the knob K, screwed onto the sleeve until the conical seat 90f said stem closes the forward end 4 of the sleeve firmly onto the spindle, after which the check-nut is screwed up against the end of the knobstem to firmly bind this in place on the sleeve.

The clamping of the sleeve upon the spindle being effected just at the inner side of the knob, (instead of at the opposite end of the knob-stem, as heretofore done in knob-fastenings of this general class,) securely holds the knob against lateral pressure of the hand, so that pulling or prying upon the knob in the opening of the door tends in the least possible degree to loosen the fastening. In practice, we find this knob-fastening to be strong and reliable, and readily adjusted. Also, our fastening has the important advantage that the same knobs may be applied to different sizes of spindles by the simple substitution of a sleeve, 2, having its central bore of the required size. In practice, the knob and the check-nut being usually of expensive and highly-finished bronze, while the sleeve 2 is made of relatively inexpensive iron or steel, this feature of changeability is a matter of convenience and utility.

In the modification shown in Fig. 2, the escutcheon-plate P is replaced by the ordinary rose, R, constructed and arranged in combination with the other parts to cover and protect the check-nut 7, which in this case is made shorter than shown in Fig. 1; but this modification is as clearly within the scope and limits of our invention as the preferred form of our improvement shown in Fig. 1.

By means of our presentimprovements, the knob while in use is held from rotation relatively to the spindle by the clamping of its threaded internal stem upon the external thread of the sleeve Without the use of any key or squared part engaging said stem.

By reference to the drawings,it will beseen that the compressible sleeve 2, has a smooth tapered or conical end and has screw-threads of uniform diameter formed upon its opposite end, Which screw-threads extend from the extreme end to a point near the center of said sleeve, terminating near the point where the taper begins, and that the knob-stem has a tapered smooth internal bore to fit the tapered end of the sleeve and has internal screwthreads of uniform diameter to correspond with and fit the screw threads upon said sleeve.

By the construction herein described, it will be apparent that the sleeve operates strictly after the manner of a conical chuck, while the knob is rigidly held against any lateral or lever-like motion of the sleeve by means of the two bearings of the knob-stem, one at the inner end thereof upon the cylindrical thread of the sleeve, and the other at the outer end thereof on the conical compressible portion of the sleeve. Also it will be observed that the threaded portion of the sleeveisnoncompressible, it being rigid and turning within the threaded end of the knob-stem with a uniform tit, and that the binding-nut, the screw-threads of which uniformly fit the threaded end of the sleeve, will, when screwed outward, bind against the end of the knobstem and firmly hold the said knob-stem against movement upon the sleeve.

Having thus described our invention, we claim In a knob-attachment, the combination With the spindle, of the compressible-sleeve, one end of which is tapered or conical and the other end of which has screw-threads of uniform diameter formed thereon, an internally tapered knob-stem having screw-threads to correspond with, and fit the screw-threads upon the sleeve, and a check-nut having internal threads of uniform diameter to lit and turn upon the sleeve to bind the knob-stem upon said sleeve, substantially as described.

CHARLES F. DOEBLER. CHARLES K. BRYANT.

W'itnesses:

FRANCIS H. RECHARDS, HENRY L. RECKARD.

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