US204606A - Improvement in escapements for toy watches - Google Patents

Description

A 3E8"? AVAELABLC. COP

2 Sheets-13.11991; 1. J. G. POWELL.

Esoapement for Toy-Watches No. 204,606., Patented lune 4,1878;

I fllllllilll BEST AVAiLABLE COP 2 Sheets-Sheet 2 J. G. POWELL. Esoapement for-Toy Watches; No. 204,606. P g tentedJune 4, 1878,

zzm/z w. mgamm eEiWilfi/NLABLF cos UNITED STALWEPA ENT OFFICE.

JOHN G. POWELL, OF PHILADELPHIA, PENNSYLVANIA.

.IMPROVEMENT IN ESGAPEMENTS FOR TOY WATCHES.

Specification forming part of Letters Patent No. 204,606, dated June- 4, 1878; application filed April 29, 1878.

To all whom it may concern:

Be it known that 1, J 011w G. POW'ELL, of

. Philadelphia, Pennsylvania, have invented a new and useful Improvement in Escap'ement Motors for Toy Watches, &c., of which thefollowing is a specification:

The main object of my invention is to so combine a duplex palletwheel in a toy ".wa'tch, toy clock, time-keeper, or other motor with a pallet-lever that there shall be a ,mprq de,'erminate and certain action of the escap'en ent than when a single pallet-wheel is. used.

My invention is also directed to improvements, fully described hereinafter, in toy watches.

In the accompanying drawing, Figurel is a sectional view of a toy watch with duplex pallet-wheel; Fig. 2, a transverse section of the same; Fig. 3, a perspective view of the pallet-lever for Figs. 1 and 2; Fig. 4, a sectional view of the watch, showing a modified duplex palletwheel; Fig. 5, a perspective view of the pallet-lever for Fig. 4; Figs. 6 and 7, perspective views showing the mode of making the rim of the balance-wheel; Figs. 8 and 9, diagrams illustrating the action of --the escapement in Figs. 1 and 2; Figs. 10 and'll, detached views of parts of the toy watch Figs. 12, 13, 14, and 15, views showing the mode which I prefer of making the duplex pallet-wheel; Figs. 16 and 17 vies sliowin g the mode of constructing the balance-wheel; and Fig. 18, a sectional view of a toy watch with single pallet-wheel. i

In Figs. 1 and 2, A is the outer casing of the watch, and a the glass in front of the same, B being the inner casing; D, the central spindle, having its hearings in the opposite sides of the inner casing, and b the pointer secured to the spindle.

Q11 the front d of the inner casing B is made an internal fixed journal for the pinion E by partially severing the metal at three points, (shown in Fig. 11,) so as to form three tongues, c e e, which are bent inward and together form the desired journal, on which the pinion E revolves, the said pinion being retained in place bending the ends of the tongues. This pinion gears into a wheel, F, which has a tubular projection made by forcing outward the central portion of the wheel, thus forming a journal, which has its bearing in the front (1 of the inner casing.

The wheelF gears into a pinion on the stem of the watch, as described in the Letters Patent No. 190,362, granted to me May 1, 1877. A spring-pawl, o, prevents the turning of the wheel F in the wrong direction.

One end of a coiled spring, G, is secured to the pinion E, the other end being attached to one of the projectionsf on a pallet-wheel, I-I, secured to the spindle l), and to this wheel is secured a second pallet-wheel, I, larger in diameter than but; having the same number of teeth as the first wheel.

The method which I prefer to adopt in makin g this duplex pallet-wheel for toy watches will be best understood by reference to the detached views, Figs. 12, 13, 14, and 15.

The wheel H is struck out at one operation by a punch and die from a sheet of ordinary tinned plate, and four holes, h, of the shape shown in Fig. 12, are cut in the wheel, a lip, f, projecting into each hole.

The wheel I consists of a ring of tinned plate with teeth on the outer edge and araised rib, j, on the inner edge. v

The lips f of the wheel H are passed through the ring of the wheel 1 until the rib j of the latter is in contact with the wheel 11. By applying heat to the two wheels :1. union will be effected through the medium of the tinned portions in contact with each other, and the duplezt pallet-wheel will be complete, the projecting lips f, to one of which one end of the coiled spring is attached, as remarked, serving to confine the said coiled spring within proper limits.

It will be understood that other modes of making theduplex pallet-wheel may be adopted when it has to be applied to time-keepers; but I prefer the plan described above for toy watches on account of its economy.

K is the balance-wheel, hung loosely on the central spindle, and having a pinion, L, gearing into a toothed segment, 70, on the palletlever M, which is of the form best observed in Fig. 3, and which is hung to two pins, :v w, within the inner casing B of the watch, one projecting inwardly from one side and the connection with the dupldx let-wheel.

558T AVAiLABLE CG? other from the opposite side? (if thejsaid inner casing. The operation of tl-it pal'Jet-lever in i palleii-wheel will be explained hereinafter.

The 'mode of cheaply makingihc rim of the balance-wheel is shown in] ljigs. Gland 7, and consists in first coiling a lilq s, l, round a mandrel of suitable diameter, and then severing the coil 0n the dotted line, Fig. 6, thereby separating it into as many rims as there are coils.

An enlarged view of the balance-wheel and mode of constructing the same is shown in Figs. 16 and 17.

A cross-bar, n, punched out of tinned plate, is clamped at its opposite ends to the rim m,

the bar having a central dished hub, n, to

which is soldered the pinion L, the latter consisting, in the first instance, of a piece of thin sheet metal, of the form shown in Fig. 17, with a number of radial arms, which are bent at right angles to form the teeth, the latter fitting snugly into the dishedhub to which they are soldered. l

The action of the pallet-ley r. and duplex pallet-wheel may be best,expl' inbd in connection with the diagrams, Figs. 8 and 9, Sheet 2, on reference to which it will be observed that the palletlever L1 has two pallets, p and p, the former being acte upon by the teeth of the small pallet-wheel H, and the pallet p by the teeth tof the larger pallet-wheel I.

This arrangement enables me to employ such pallets and that both wheels shall act on the pal et-lever through a more determined leverage than can be attained bya single pal- Thus, in Fig. 8, the duplex palletwheel being turned in the direction of its arrow by the spring, and a tooth, q, of the wheel H acting on the end of the pallet p, force will be exerted, through a leverage, to move the pallet-lever M in the direction of its arrow. In Fig. 9 the same lever is being moved in the contrary direction by a tooth, t,

of the larger wheel I acting on the pallet 11,

' this movement being also elfected through a leverage, owing to the relation of the center of the pivot-pin and .of the palletto the teeth of the wheel, this center being at a point between the bases of the teeth q of the wh eel H and the points of the teeth of the wheel I. No such leverage can be obtai ed for the two movements by a single paJet -wheeI. This leverage is of especial importance in toy watches, in making which, at the necessary I cheap rate, perfect exactitude in workmanship cannot be attained; but the leverage exerted by the two pallet-wheels to vibrate the palletlever is such that; the movement of the latter will be continued in spite of slight defects in the pallets or teeth.

The efi'ect of the duplex pallet-wheel may still further be understood by comparing it with thepl au shown in Fig. 18, in which a single padetwheel is used substantiallyin the manner escribed in the Letters Patent No. 17l,851, granted to me J a-nuary 4., 1876.

A dup ex pallet-wheel may he made in the manner shown in Fig. 4, where an annular zigzag rib is secured to a plate or disk on the central spindle, the external projections formed by this rib being the teeth of the larger palletwheel, and the in ernal projections being the teeth of the smaller wheel. In usin aduplex wheel of this kind the pallets of the pallet lever must be arranged substantially in the manner shown in Fig. 5.

Although I have referred in the above description to the main feature of my invention, the duplex pallet-wheel, as applied to a -toy watch, it may be used with advantage in connection with' time-keepers, and may also constitute a inotoi' or part of a motor for toys and other like purposes.

I claim as my invention- I 1. In a toy watch, toy clock, time-keeper, or other motor, an escapement-motion consisting of two pallet-wheels, one of less diameter than the other, and a pallet-lever, one pallet of which is acted on by the teeth of one wheel and the other by the teeth ot'the other wheel, all substantially as set forth, for the purpose specified.

2. The combination of the duplex palletwheel and. the pallet-lever with the inner case B of the toy watch, toy clock, or other motor, and the pivotpins w a: for the said lever, the said pins projecting inward from opposite sides of the case, all substantially as set forth.

3. Thewithin-described duplex pallet-wheel, consisting of the wheel H, with its bent lips f .and the toothed ring I, the two being secured together, all substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J OHN G. POWELL.

Witnesses:

HARRY A. Oanwronn, HARRY SMrrH.

Images