US92786A - Improved mechanism for driving sewing-machines - Google Patents

Description

' A 2 Sheets-Sheet 3. VYHITHED, BRADSHAW & BROWN,

Sewing- Machine Treadle. No. 92,786. Paemed my 20,18%.

Sheets-Sheet 2.-

WHITHED, BRADSHAW BROWN. l

Sewng-Machin Treadle'.y

No. 92,786. Patented July 20, 1869.

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UNITED vSTATES PATENLQELIQE.

JOHN A. BRADSHAW, WILLIAM H. BROWN, AND DARIUS lVHITHED, OF LOWELL, MASSACHUSETTS.

INIPROVED MECHANISM FOR DRIVING SEWING-MACHINES.

Specification forming part of Letters Patent No. 92,786, dated July 20, 1869.

.To all whom it may concern:

Be it known that We, JOHN A. BRADSHAW, WILLIAM H. BROWN, and DARIUs WHIT- HED, all of Lowell, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Sewing-Machimes; and we do hereby declare that the following is a full and eXact description thereof, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon.

The nature ol our invention consists in providing for sewing-.machines a device whereby a rotary motion is transmitted to the same by means of segment-gears, pawls, and ratchets, without the aid o' a crank and pitman.

It also relates to the arrangement and combination of the adj ustabie casters, whereby the same may be applied and adjusted, which, when to be removed, the machine is rendered portable, and when in use rendered fixed or stationary.

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

Figure 1 represents a front elevation of a sewing-machine frame or stand with our improvements attached. Fig. 2 represents a plan of the same with the top of the machine removed. Fig. 3 represents a vertical section of the same showing the working parts on the opposite side from the driving-pulley. Fig. 4 represent a vertical section of the same showing the Working parts on the driving side of the machine.

Similar letters in the different figures indicate corresponding parts. Y

a a represent the top of the sewing-machine frame, which is provided with legs a and b, they being secured to the same and located 011 each side. Secured to these legs a and b, are the girts b', c, c', and d, which are parallel with the top c of the sewing-machine. Formed in the top girts, b and c, are bearings for the reception ot' the driving-shaft d and stud-shaft e, which is located back of the same, and on which shaft e are the segment-gears e and f, they being held in position by means of the requisite collars, allowing them to turn freely on the shaft e. Attached to these segmentgears c' and f are thetreadlerods f and g l and Z/-are friction-springs, which furnishV the ratchets k and 7c with the requisite friction, preventing the same from turning backward.

m is a saddle, which sets ou the shaft el and e, connecting with the foot stop-motion m by means ot' the connecting rod or strap n.

n and o are the caster plates or rods, which are pivoted at each end to the adjustable slides o o and p p. On the top of these plates n' and o, near each end, are pivoted the casters p', q, q', and r, these slides o o' and p p operating on the plates r r' r rf, which are firmly secured to the bottom ot' the legs a' and b.

s and t are toggle-joints which connneot with the caster-plates u and 0 and legs a and b.

u is a balance-wheel, which is secured tothe shaft d', it beingl located on the outside of the legs b b, which acts as a balance and driving wheel to the sewing-machine, transmitting power to the same.

The machine being thus constructed, and its several parts adjusted iu position, and the other devices, which constitute the entire sewing-machine, being located as required, is then ready for use, motion being transmitted from the driving-pulley or balance-Wheel u to the driven pulley on the machine. The operator, by giving the treadle g an alternate motion, produces corresponding motion to the segment-gears e and f by aid of the treadle-strapsf and g. These segment-gears e and j', gearing into the loose pinions h and h', produce the same alternate motion in them, which by the aid of the collars i and i', with their pawls j and j' attached, operate the ratchets 7c and le inversely with each other-that is, when the pawly is engaged in the ratchet 7c the pawl j is disengaged from the ratchet la', and vice versa, and the springs Zand l', acting in concert with their respective ratchets 7c and lc', give the required friction to the same, preventing any backward movement of them under any circumstances. This alternate operation of the pawls j and j upon the ratchets k and k gives a continual, continuous, and uniform rotary motion to the driving-shaft d as long as power is applied to the treadle g by the operator. When the machine is required to be stopped for any purpose the operator, by aid ot the saddle m, acting upon the shaft d by means ofthe stop-motion mi and connecting-rod n, depressing' the same, is enabled so to do easily and suddenly, and the machine, when stopped in any position, is in condition to be started by the operator Without beingobliged to start the same with the assistance of the hand, as there are no deadpoints to overcome, as there always is with the use of the crank and pitman and, further, the machine is rendered portable at a moments notice by aid of the caster-plates a and o, with casters 17', q, g', and 1', operated upon by the toggle-joints s and t, which raise the machine from the door and rest it upon the casters p', q, g', and r; and the machine is made stationary by elevating the casterplates n' and 0 with casters p', q, g', and 'r by aid of the toggie-joints s and t, thus allowing the machine to rest firmly on the floor.

Thus it will be seen that with our improvements attached to sewing-machines the op erator is enabled to produce fa steady, easy, uniform motion ot' any required speed, superseding the necessity of theuse of the crank and pitman,havingnodead-points to overcome, and the machine, under all and any circumstances, can be started by the foot without being,` obliged to remove the hands from the Work to assist, making a compact, reliable, durable, portable or stationary machine.

vWhat we claim as our invention, and desire to secure by Letters Patent, is-

1. The arrangement of the segment-gears e' and f, ratchets 7c and 7c', pawls j and j', and rods j and g, substantially as herein described and specified.

2. The caster plates or rods r and o, with casters p', q, g', and r, when arranged in reference with each other and operated substantially as herein described and specified.

3. The adjustable slide o o and p p, in combination with the caster-plates n and o, for the purposes as specified.

JOHN A. BRADSHAW. WM. H. BROWN. DARIUS WHITHED. Witnesses:

R. P. RAWsoN, GEO. E. PEVEY.

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