US421670A

US421670A - Cromwell

Info

Publication number: US421670A
Authority: US
Publication date: 1890-02-18
Anticipated expiration: 1907-02-18

Description

(NoModel.) l l G. O. CASE. DOOR KNOB.

No'. 421,670., Patented Peb, 18, 1890.

Iml

144701515555. //7 V51/7 mr.

UNITED STATES ATENT CFFICE.

CROMWELL O. CASE, OF NEV BRITAIN, CONNCTICUT, ASSIGNOR TC P. n

F. CORBIN, OF SAME PLACE'.

DooR-KNoB.

SPECIFICATION forming part of Letters Patent No. 421,670, dated February 18, 18,90.

Application filed December 6, 1889. Serial No. 332,778. (No model.) l

To all whom t may concern:

Be it known that I, OBOMWELL O. CASE, a

citizen of the United States, residing' at New.

Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Door Knobs, of which the following is a specification.

My invention relates to improvements in door-knobs; andthe object of my improve- 1o ment is economy in construction, and particularly to enable a sheet-metal knob-shell to be fastened to a cast-metal knob-shank.

In the accompanying drawings, Figure 1 is a plan view of one part of a knob-shell with knob-shank attached. Fig. 2 is a sectional Viewl of the same on line of Fig. 1. Fig. 3 is a reverse plan view of the lower lpart of the knob-shell. Fig. 4 is a side elevation of the knob-shank. Fig. 5 is a plan view of the 2O holding-washer, and Fig. 6 is a sectional view of the same on line y y of Fig. 5.

I have illustrated only that part of the knob-shell that is secured to the knob-shank. This part is intended to be used with another 2 5 sheet-metal knob shell or cap of any ordinary construction, which will be secured to the shell shown in any desired or ordinary man- 4ner of securing two such parts together.

The knob-shellAis struck up of sheet metal 3o with a solid end, which is perforated, as at 7, Fig. 3, the contour of said perforation being substantially the same as an end View of the boss or tenou 8 on the knob-shank B. This tenon has in end View a contour which is in the form of a truncated circle or cylinderthat is to say, the form of a cylinder that is cut away upon two sides, as shown in the plan view, Fig. l. The cylindrical sides of this tenon are made with overhanging projections, 4o preferably by being threaded, as shown in Figs. 2 and 4.

The knob-shell A, as beforestated, has a perforation 7, Fig. 3, whose contour corresponds with that of the tenon 8. Said shell is seated upon said tenon, with its end resting upon the flange 9 of the knob-shank B, the form of the tenon and perforation being suchI that the parts cannot rotate one upon the other. The knob-shank may be of cast-iron,

or of any brittle or hard metal not malleable 5o enough to be practically riveted. Aholdingwasher lO, having a perforation conforming to the contour of the tenon 8 on the knobshank, is then placed thereon, and the whole secured together by swaging or riveting the washer until it snuglyrfills the space within the shell surrounding the tenon 8, including the threaded portion of the tenon. The washer of course will be of malleable metal suitable .for thus riveting-as, for instance, wrought- 6o iron or homogeneous steel. It may be riveted by a hand-setting punch and-hammer; but I prefer that it shall be riveted in a rivetingmachine or power-press.

By this construction I am enabled to readily and firmly secure a sheet-metal knob-shell to a knob-shank that is composed of cast-iron or other metal unsuitable for riveting, and thereby produce a knob at a small cost.

I claim as my invention- 7o The principal part of a knob herein described, the same consisting of the sheet-metal shell A, the knob-shank B, having tenon 8, and the holding-washer 10, the parts being secured in place by swaging or riveting said holding-washer, substantially as described, and -for the purpose specified.

ALBERT N. ABBE, C. A. BLAIR.