US496576A - Knob attachment - Google Patents

Description

R T A 0 M E m m Y N GM H M n l m d 0 H o m H No. 496,576. Patented May 2, 1893.

U ITED STATES PATENT OFFICE.

JOSEPH P. MAGNEY AND RUFUS L. CATE, OF SAN FRANCISCO, CALIFORNIA.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 496,576, dated May 2, 1893.

Application filed July 8, 1892.

To all whom it may concern.-

Be it known that we, JOSEPH P. MAGNEY and RUFUS L. CATE, citizens of the United States of America, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Door Knobs and Spindles, of which the following is a specification.

Our invention relates particularly to the connections between the knob and the spindle of a door latch.

The object sought to be accomplished is, first, to avoid the use of, a screw or any other part for holding the knob to the spindle, removable in use and liable to work loose; to provide a secure, easily connected and disconnected fastening; to avoid complication of parts; and to render the knob adjustable for doors of diiferent thickness, or for shrinkage.

Our invention is hereinafter described, and illustratedin the accompanying drawings, in which:

Figure 1-shows a longitudinal section along the spindle; Fig. 2-a transverse section on line a;x of Fig. 1. Fig. 3is a detail perspective view of the locking parts detached.

In the drawings A represents the knob, and B the spindle of a door latch, these being of any construction. The shank of the knob A is shown in longitudinal section at cl. It is provided with the ordinary axial hole to receive the spindle. A transverse hole is tapped into this shank opening from the outside to the interior. In this is set a thimble e,which is threaded on the outside and fits the threads in the hole. Within this thimble is a spring catch, or bolt, which engages, when the thimble is in place, with holes or notches in the spindle. The thimble is used simplyfor convenience of construction, and to hold the locking spring catch or bolt, in the shank, but this is not essential to the principal part of our invention. The thimble is shown at 6. Its interior is cylindrical, opening from the lower end. The upper end is partially closed, having only a central opening. lVithin the thimble is placed the catch g. This we prefer Serial No. 439,357- (No model.)

to make in .the form shown, which is that of a disk, which fits the bore of the thimble, provided with a rectangular rib vi on this lower face which fits into the transverse kerfs k, in the spindle. On the upper side of the disk is a stem m, which projects through the hole in the upper part of the thimble. This is provided with a cap, 07., on opposite sides of which are small studs which fit into a kerf 0, made centrally across the top of the thimble. When the catch is in a kerf or hole in the spindle, the cap is down on the top of the thimble, with the studs in the kerf of the thimble. This locks the thimble and prevents it from turning out. Between the disks and the top of the thimble is a coiled spring placed around the stem, and held in place, by the cap on the stem, which secures the locking mechanism in the thimble. Manifestly the rib, which forms the direct locking connection might be of any other cross section and fit a corresponding cavity in the spindle.

We do not limit ourselves in respect of any of the particular forms shown, the essential part of our invention consisting in the spring catch combined with the knob, and arranged to engage with holes or kerfs in the spindle. These kerfs may be made to cover the ordinary extent of adjustment, but in finer degree than is possible, with the ordinary screw, since the catch is narrow, and the holes or kerfs correspond thereto. The catch may be drawn and held out of engagement byinserting a knife edge or even the thumb or finger nail, under the cap. The construction allows the knob to be adjusted closely to the door, and to be readily attached or detached.

We claim 1. In combination with the shank of a door knob, having a screw threaded opening transversely thereof,,athimble screw threaded to fit said opening and carrying a spring catch adapted to engage the spindle, substantially as described.

2. In combination with the spindle having a series of holes and with the shank, a threaded thimble having a spring catch, the stem of which catch extends through the top of the thirnble, and locking devices between said cap and thimble said thimble being fitted In testimony whereof we affix oursignatures to the shank, substantially as described. in presence of two witnesses. 3. In combination with the spindle havin -1 a series of holes or kerfs the knob shank, th e gg ggg 'ggg 5 thimble, the catch adapted to engage with notches in the spindle, the stem of the catch WVitnesses: and a stud engaging with a kerf in the thim- HENRY E. COOPER,

ble, substantially as described. WALTER DONALDSON.

Images