US337381A

US337381A - Sewing-machine stand

Info

Publication number: US337381A
Authority: US
Publication date: 1886-03-09
Anticipated expiration: 1903-03-09

Description

(No Model.)

J. G. GOOHRAN.

SEWING MAGHINE STAND.

No. 337,381. Patented-Mar. 9, 1886'.

' I'll-1.5-

FIG.2.

UNITED STATES PATENT OFFICE.

SEWING-MACHINE STAND.

SPECIFICATION forming part of Letters Patent No. 337,381, dated March 9, 1886.

Application filed April 27, 1885.

T 0 all whom it may concern.-

Be it known that I, JOHN O. COOHRAN, a citizen of the United States, residing at Ripley, in the county of Brown and State of Ohio, have invented certain new and useful Improvements in Sewing-Machine Stands. of which the following is a specification, reference being had therein to the accompanying drawings." 1;.

The first part of my present invention comprises a novel arrangement of braces that stiffen the legs or frame of a sewing-machine, and without interfering with the operators feet, the details of said braces being hereinafter more fully described. i

The second part of my invention comprises a novel combination of conical journal-bearings, absorbent bushing, and adjustable spindle for the main or driving shaft of a sewingmachine, the details of said combination being hereinafter more fully described.

In the annexed drawings, Figure 1 is a front elevation of sewing-machine frame embodying my improvements. Fig. 2 is a transverse section of the same, taken in the plane of the pitman. Fig. 3 is an enlarged section of the pitman-connection, taken transversely of the crank 'or wrist pin. Fig. 4isa front elevation of said connection. Fig. 5 is an enlarged axial section of the cone-bearing.

A represents a sewing-machine table, which is supported on legs B B,0f any approved pattern, said legs being stiffened by means of a pair of reversely curved or arched braces, C O, the latter being united at or near their midlength by short connections 0 c.

The lower ends of the bottom brace, O, are attached to the legs B B at or near the place where the treadle-shaft bearings are located, and said brace is provided with branches D D, that connect with said legs at a point somewhat above said shaft-bearings, as more clear- 1y seen in Fig. 1. These branches or arms D D stiffen the lower part of the curved brace C, and prevent any injurious spreading or vibration of the middle portion of the frame or legs.

The upperends of the reversely-curved brace O are secured to the legs B B near the point where the latter are fastened to the table A. Furthermore, the branch D, that joins the leg Serial No. 163,585. (No mode'.)

B, may extend upwardly and connect with the top brace, O, as indicated by the dotted lines D. .By this arrangement of braces and arms I obviate the necessity of a tie at the bot- 5 5 tom of the machine, and at the same time the fly-wheel shaft and treadle-shaft are causedto run true in their bearings and not work loose, and thereby produce what is known as lateral motion.

Cast with or rigidly attached to a shaft, E, is a treadle, F, having at its left enda lug, j, that serves as a connection for the lower end of the pitman G, whose upper end is coupled to a crank or wrist pin, h, of the shaft H, said shaft being provided near its right end with a fly-wheel, I, and a grooved pulley, I, which pulley receives the band that drives the sewing-machine, By thus arranging the treadle, pitman, and fiy-wheel the weight of the stand or frame is very evenly balanced, and the treadle F is brought directly in front of the operator, thereby enabling the machine to be run with the greatest facility, and withoutlossof power. Furthermore, this location of the pitman-crank on its shaft and the pitman-connection on the treadle in close proximity to the left side of the machine, with iiy-wheel and belt-pulley on the shaft and near the right side offrame,gives this class of stands 8c a decided advantage over those stands whose pitman-cranks are either at the center or near the right end of the driving-shaft, the principal advantage being that the end of the shaft on which my balance-wheel is hung is neither thrust up nor pulled down by the motion of the pitman. On account of this the continubus regular weight of the balance-wheel on the right end of the shaft exercises a constant pressure on the upper side of the cone-bear- 9o ing, the latter being more fully described hereinafter. This constant pressure against the upper side of the cone-bearing at the right end of the shaft H prevents end shake or jar, and keeps the left end of said shaft up to a perfectly close fit on the other bearing.

J is a guard that prevents the operators garments coming in contact with the pitman and its connections.

The fly-wheel shaft H has a conical socket, h, in its end, as seen in Fig. 5, which socket receives a hard tapering bearing, K, the latter being screw-threaded at k, to engage with the leg or other member of the frame or stand of a sewing-machine.

h is a jam-nut that locks the tapering bearing or spindle K within the stand or frame. Surrounding a suitable portion of the socket h is a eounterbore, L, adapted to receive an annular bushing, M, of leather or other fibrous or absorbent material capable of retaining oil for a considerable space of time. By this arrangement the porous bushing M serves to lubricate the shaft-bearing, and causes the machine to run with the least possible friction.

The pitman G is split in the plane of the crank-shaft or wrist-pin. as seen at g in Fig. 2, and these two members or sections are clamped together by a screw or bolt, 9, after said pitman has been titted around said crank, the latter being inserted in the slot P, which is semicircular at its upper end. Bored through the split end of the pitman at apoint slightly below the crank 71, and at a right angle'to the latter, is a chamber, R, that is preferably cylindrical, said chamber having fitted in it a pair of adjustable blocks or bearings, S S, upon whoseupper edges rest said crank or other coupling device. These bearings are caused to approach each other by means of a screw, T, in order that any longitudinal wear of the slot 1? can be readily compensated for by simply tightening up saidscrew. It is evident, however, that only one of these blocks need be adjustable, and that the chamber R may in some cases extend but part way through the pitman and be provided with a single block.

I claim as my invention- 1. The combination, in a sewingmachine stand, of the main braces O 0, arranged in the mannerherein shown and describedsaid braces being provided with branches D D, attached to the opposite legs, B B, at a suitable point below the driving-shaft H, forthe purpose of preventing any spreading of the lower portion of the frame, as stated.

2. A sewing-machine driving-shaft sup ported at each end on conical j OurnaLbearingS, which bearings consist of a socket, h, absorbent bushing M, and adjustable spindle K, for the purpose specified.

In testimony whereof Iafiix my signaturein presence of two witnesses.

JQHN G. GQQHBAN. \Vitnesses:

, J OHN SCHMIDT,

ALFRED Mormon.