US99669A - mceee - Google Patents

Description

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BnoonLrN, n. D.,

Letters Patent N 99,669, dated February 8, 1870.

'111e Schedule referred to in these Lettera Patent and making par: of the same f To all whom it may concern.-

l the frame of a sewing-machine, on the planeet' the line :z: x, tig. 2, disclosing a` side elevation ot' our inveutlon.

Figure 2 is a longitudinal section of our invention,

Vtaken on the plane ofthe line y y, fig. 1.

Figure 3 is a detached end view ofthe brake-mechani'sm.

Figure 4 isa detached 'section of said brake-mechanism, taken on the plane ofthe line z z, tig. 2.

Similar-,letters refer to like parts in the several figures.

This invention relates to an improved spring-power, particularly applicable for driving a sewing-xnachine`. i The treadle isiconueeted to the wimling-mechanism by' means of a ratchet-wheel and spring-pawl, the

spring-pawl being so constructed 'and arranged that it will, when not in ,actual use, immediately disengage itself' from the ratchet-wheel, and remain in a position to be engaged. therewith in the quickest imaginable time, whereby the operation ot' winding up or renewing the driving-power can be eii'ected by the foot at any moment, and with little or no exertion on the part'of the operator.

To such end, therefore, our invent-ion consists in' the combination, with the winding-gear'ot'a springpower, ot'a foot-lever, so arranged and operating that the winding up or renewing ot" the power may be effected quickly and easily, and without stopping or retarding the operation ot' the'sewing-machine or other mechanism which is being driven by our improved spring-power.

It also consists in the combination, with an actuat-` ing spring oi' a gear or driving-wheel and a sha-it, 0i' a friction-strap', drum, and foot-lever, whereby the speed ofthe gear or driving-wheel can be regulated as desired, or its revolution totally stopped by means of the foot.

It also consists in the combination of a pawl, provided with a heel operating as a stop, with a spring, whereby we produce a pawl or detent ofa novel construction.

We have shown our spring-power as applied to the frame of a sewing-machine, A designating such `fra-me,

A1, the driving-shaft 0I" the sewing-machine, and A, the cloth-plate thereof.

' lhe main shaft b ot' the spring-power has its lbearings in the frame A, and upon this shaft a cog-wheel, c, is mounted, which cog-wheel serves to transmit the powerto the mechanism to be driven. We willhow evenremark that a belt-wheel may be substitutel fer the cog-wheel in some cases, as is obvious.

In the instance shown, a cog-wheel, c, carrying a .small cog wheel, o", is arranged on a shaft mounted in said frame A, the cog-wheel c2 meshing with the cogwheel c, and the wheel cI with another cog-wheehc; on 'the driving-shaft A ofthe sewing-machine.

The said spring and shaft is provided with the ordinary whaling-gear, consisting principally of' a ratchet-wheel, d, and click or pawl c, the shaft b being provided with a square end, so that the winding up ot' the spring canbe effected by means of a key or winch applied to such square end, as will be clearly understood by reference to g. 2..

In operating a sewing-machine, for instance, by a i spring-power wound up by hand, as above stated, the

power ot' the spring may become exhausted at just such a time when it is inconvenient or impracticahle for the operator to leave the work to wind up the spring. this ditliculty.

With the ratchetwheel d we have combined a treadle, B, and spring-pawl f, in suoli manner tha-tthe pressure of the foot-upon the treadle will turn the shaft b at any moment, andthe spring-power can thus be kept wound up in an operative condition as long as desired.

The pawl f is thrown towardl the ratchet-wheel cl by the action of a spring, g, bearing on its heel; and from said heel projects a stop, h, which prevents the pawl from being thrown towardthe ratchet-wheel any further than necessary, or coming in cont-acttherewith when the treadle is released from pressure ot' the foot; and said stop h also prevents the pawl being thrown in4 such position that it will fail to act properly on the ratchet-wheel for turning the same.

0n the shaft b is mounted a drum, fi, which is subjected to the action of a friction-strap or band, j. This strap embraces the drum, as shown in iig. 4, and it connects on'one side with a spring, L', and on the opposite side with a foot-lever, l. Itno power is applied to said lever l, the spring 7c, pulls the friction-strap up against the periphery of the drum, and the motion ofthe spring-power is checked.

By applying power to the lever I, the force ot the spring la can he balanced and the strap brought in We provide a means for entirely overcoming such position as to release the drum i, and the niotion ot' the spring-power is entirely unchecked. By applying still more power to the level' l, the frictionstrap can be brought to bear on the drum z', with :i-ny desired force, and the motion of the spring-power can be cheeked or entirely stopped.l a

lt'it is desired to retu'in the lever Z in any desired position, it is inode to catch in it notched bar, m, best Seen in iig. 3.

1n cases where it is desirable to bring the mechanism snddenlyut rest, we attach o. lng, n, to the lever l5 which, when pressure ofthe foot is withdrawn from said lever I, will1 hy means of the spring k operating on the strap, be drawn in an interdental space of the wheel c, and brinfor the mechanism suddenly at rest.

This spring-power, it will be seen, is admirably adapted for driving sewing-machines or other small inaehines of a similarehznzicter, and that by means ofthe trendle B, the operator is enabled to keep up the operative-power without being obligedto take the hands from the work being operated npon, and the speed obtained from the spring-power` eaux he controlled us desired, by theaction ofthe feet on the lever Z.

What we elniln :is our invention, and desire to se cure by Letters Patent; is

l. The tre-edle or toot-lever l, in combination with the winding-gear ol' the spring-power, substantially as' described.

2. The lever l :ind spring k, in combination with the friction-strap j, drinn i, and spring-power, substantially us set forth.

3. The pawl f, provided with the stop. h, in combhmtion wit-h the spring g, substantially as herein specitied.

A. C. HALLAM. JAMES W. MCKEE.

Witnesses: v l

M. M. Liv1NGsToN, T. B. BEEGHER'.

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