US92644A - Improvement in dead-beat verge for clocks - Google Patents

Description

their smc tieni Gtiijiirr.

Letters Patent No. 92,644, dated July' 13, 1869.

IMPROVEMENT IN DEAD-BEAT VERGE FOR CLOCKS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom fit may concern Figure 3 is a plan or top view of the blank of which the ears are formed.

Fignre'li is a 'plan or top'view of the blank of which the verge is formed.

Similar letters of reference indicate like parts.

My invention consists in swaging the body and palletsof a dead-beat or four-pallet verge, from a ,thin strip of metal, and attaching ears to the same, by which it is pivoted to the front side of the clock.

It is well known that the ordinary springs for cheap clocks, exert much more power when lirst wound than when nearly run down.

. The common. recoil-verge has but two pallets, both ot which are impulse-pallets; consequently, when one pallet has given the pendulum-ball an impulse, the other pallet immediately begins t'o exert its power to throw the' ball back, and soon hurries it the other way; thus, when the power of the spring is the strongest, the are described bythe ball will be the shortest, andthe number of vibrationsper minute the greatest, causing the clock to run 'too fast when first wound, and too slowV when nearly run down.

NVhe'n the teeth ofthe eseap'ement-wheel strike the dead-beat pallets a, a, the wheel remains stationary until the ball has described its full arc, and returned so far that the teeth of the escapement-wheel strike the impulse-pallets c c, when an impulse is given and the wheel nieves. Thus it will be seen that a deadbeat vergedoes not shorten the are of the pendulum ball, and consequently eq'ualizes the power of the spring.

The ordinarydead-beat verge is so expensive as to prevent its general use upon cheap clocks.

To make a better article of the common clock, Without increasing itsprice, is the object o f my invention.

To construct these verges, the metal is first out across the grain into strips as wide as the vergeblank,g.

4, is designed to be, and then cut in strips of the width designed for the verge. Itis then swaged into shape,

, great care being taken to swage the Adead-beat pallets a a, g. 1, into nearly or quite the requisite shape. It is then filed to a gauge, or milled in a milling-machine to shape the impulse-pallets c c, and take a slight dressing from the dead-beat pallets a a, in case they are not properly swaged.

With a suitable die and punch are cut ear-blanks, fig. 3, the body of which is riveted to the `body of the verge A, and the ears d dswaged or bent into position, as shown in figs. 1 and 2. r

The verge-rod eis passed through ahole in the body of the verge A, and then upset toseoure it in its place.

The verge A is then hung to the front of the clock by a pin passing through pin-holes i in the ears d d.

The pallets a' a and vc c, of the verge A, are of the same shape as the. common dead-beat verge.

The shape of the metal, however, opposite-the palletsis very different from the ordinary dead-beat verge, but as these, are not the working parts,` it is immateriaiwhat shape they are.

'lo construct theordinary'style of dead-beat verge,

metal is selected which is as thick as' it is desired to make the width of the verge.- Then, with a suitable die and punch, the verge is cut into the desired shape. Itis thentrimmedto a-gauge and polished, and then rigidly secured to an arbor passing through its body,

which arbor is provided with a pivot at each end, and hung between the frames ofthe clock-movement.

The cheapest of this old style of dead-beat verges, cost six cents each, 'and the other parts of the clock are' generally made of a corresponding price.

The cost of my" improved verge cannot exceed two cents each; therefore I produce a good dead-beat timer for about one-'third the usual cost.

If desired, my style of dead-beat verge might be hung between the frames 'of the clock, by securing-the body ofthe verge A to an arbor, by means rof arivet; but I consider it preferable,for cheap clocks, to hangit in front ofthe frame. A' f I do not claim the common recoil-verge, which has only two pallets, both of which are shaped a file,

although the body of the verge is swaged.

Neither do I claim the application of a dead-beat -verge to a cheap clock, unless the verge is constructed as described; but

What I claim as new, and desire to secure by-Let ters Patent, is-

A dead-beat verge, constructed substantially as described, and for` the purpose specified.

NOAH POMEROY. fitnesses GEORGE W. A'rKrNs, CHARLES A. Borna.

Images