US463780A

US463780A - Sheet-metal knob

Info

Publication number: US463780A
Authority: US
Publication date: 1891-11-24
Anticipated expiration: 1908-11-24

Description

E. L. ROGERS.

SHEET METAL KNOB.

(No Model.)

Patented Nov. 24, 1891.

UNITED STATES PATE T OFFICE.

ERNEST L. ROGERS, OF IVOROESTER, MASSACHUSETTS.

SHEET-METAL KNOB.

SPECIFICATION forming part of Letters Patent No. 463,780, dated November 24, 1891.

Application filed February 26, 1891. Serial No. 382,956. .(No model.)

To all whom it may concern.-

Be it known that I, ERNEST L. ROGERS, a citizen of the United States, residing at Worcester, in the county of WVorcester and State of Massachusetts, have invented a new and useful Improvement in Sheet-Metal Knobs, of which the following is a specification.

The aim of this invention is to simplify the manufacture of stove-door knobs and the like; and to this end the invention consists of the knob described and claimed in this specification.

Referring to the accompanying drawings, forming part of this specification, Figure 1 represents the blank from which the knob is stamped. Fig. 2 represents the form after it has been pressed in the first set of dies; and Fig. 3 represents the finished article, or the knob, after it has been pressed in the second set of dies.

In detail, A represents the blank cut out of the usual sheet metal. This blank consists of the central or body part B and the leaves 0, which may be four in number, as shown; but it is evident, of course, that the number of these leaves is immaterial, as the same I may be varied to suit the exigencies of the particular pattern desired. preferably brought to a sharp point, as shown, andare connected to each other by the compound curve D. The central part of this curve D is sodesigned that when the blank is pressed into the desired shape a hole of any desired pattern or outline will be left in the knob. Frornthe ends of this central part of the curve D the contour of the leaves 0 is such that when the same are pressed into the desiredshape the same will meet in substantially a straight line. When the blank is pressed in the first set of dies, the same will be forced into the form shown in Fig. 2that is, the part B will be drawn or forced into the cup-shaped part B and the leaves 0 will stand out around the same, as shown. The bottom of the part B is pricked at this operation, if desired, as is the common practice, or the knob may have the same pricked in at a separate operation.

'The hole or inwardly-turned edges 1) are tapped, as is usual, to receive the usual screw The leaves 0 ared and washer c. It will be seen that in this operation the edges of the curve D are brought together to form the nickeling-holes E. die that forces the leaves 0 together at the edges a. The leaves are shaped as indicated at C, Fig. 3, after this operation. The leaves may of course be brought together way up to the point, so as to form a smooth exterior surface; but the preferred form isas shown that is, with the ends of the leaves separated a short distance, so as to form a very orna- The form is now taken and put under a mental pattern and to allow the circulation Having thus fully described my invention, 'what I claim, and desire to secure by Letters Patent, is

1. A sheet-metal knob made of a single piece of metal and struck up from a blank, consisting of the body portion B and the pointed leaves 0, the width of the leaves at the line where they connect with the .body portion B being less than their extreme width, substantially as described. 1

2. A sheet-metal knob made of a single piece of metal and struck up froma blank, having the body portion B and the leaves 0, said leaves being separated by the compound curves D, whereby the holes E will he formed or left in the-finished article, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ERNEST L. ROGERS. Witnesses:

LoUIs W. SOUTHGATE, FREDERICK B. HARLOW.