US236818A

US236818A - Escapement for clocks and watches

Info

Publication number: US236818A
Authority: US
Publication date: 1881-01-18
Anticipated expiration: 1898-01-18

Description

(No Mode l.)

' I J. B. JOHNSON.

Escapeme'nt for Clocks and Watches.

' Patented Jan. 18,1881.

No. 236,s|s.

i 7H a 7 g Fi 2.

Wm] E55E5 LNVENT R m: 2776 Jag MAW- rem N,FETERS, PHOTO-UTHOGRAPHER. WASHINGTON. D Cv UNITED STATES PATENT OFFICE.

JOHN B. JOHNSON, OF BOSTON, MASSACHUSETTS.

ESCAPEMENT FOR CLOCKS AND WATCHES.

SPECIFICATION forming part of Letters Patent No. 236,818, dated January 18, 1881,

Application filed April 19, 1880.

To all whom it may concern Be it known that 1, JOHN B. JoHNsoN, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Escapements for Clocks, 850., of which the following description, in connection with the accompanying drawings, is a specification.

My invention relates to an escapement for clock-work, and has for its object to produce an escapement in which the teeth of the scapewheel act upon both pallets in precisely the same manner, imparting the same power to the pendulum or balance.

The invention consists in providing pallets in two independent arms, each pivoted on the opposite sides of the scape-wheel, the said pallets or arms being connected by a link, so that as one is thrown out from the scape-wheel by the action of a tooth thereof the otheris drawn in to be engaged by a tooth on the opposite side. It will be seen by this arrangement the pallets and their arms may be made precisely alike and placed in precisely the same position relative to the escape-wheel, thus permitting the power to be applied by the said scapewheel to the best advantage.

Figure l is a front view of a train of wheelwork provided with my escapement, and Fi 2 a side view thereof.

The frame-work (0 consists of two plates joined by suitable parts, and provided with bearings for the wheel-work, which consists of a driving-gear, b, and speed-increasing train 0 61 cf, the latter engaging a pinion, g, on a shaft, h, carrying the scape-wheel i, which may be provided with teeth of any usual shape. The pallets m m are carried upon the arms at n, attached to the spindles 0 0, pivoted in the frame-work. The pallet-arms n a are con- (No model.)

nected by a link, 1', which may be of suitable shape to pass over the right shaft h of the scape-wheel, the said link causing any move mentof one of the said arms to be transmitted to the other, so that as one is thrown out by the tooth of the scape-wheel bearing against it the other is drawn into position to engage a tooth on the other side of the said wheel.

The pendulu m-actuatin g rod may be attached to either of the spindles 0 0, as desired. As herein shown, a small pendulum,p, is attached directly to the spindle 0.

If the scape-wheel varies in the uniformity of its teeth, it will run hard at some points; but under the construction herein described such variations in the scape-wheel, if they ocour, will be immaterial, and the movement will be uniform.

I am aware of an escapement having independent pallets vibrating on separate pivots; but in such the pallets are connected by levers, necessitating a considerable amount of lost motion and affording surfaces greatly exposed to wearing action--objections which are wholly obviated by my improved device.

I claim- The combination, with the scape-wheel, of two separated pallet-arms, pivoted on opposite sides of said scape-wheel, and a connectinglink for said pallet-arms, all arranged and to operate substantially as described.

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

JOHN B. JOHNSON.

Witnesses:

G. W. GREGORY, L. F. CONNOR.