US804727A

US804727A - Safety-barrel for watches.

Info

Publication number: US804727A
Application number: US25201605A
Authority: US
Inventors: George F Johnson
Original assignee: ILLINOIS WATCH Co
Current assignee: ILLINOIS WATCH Co
Priority date: 1905-03-25
Filing date: 1905-03-25
Publication date: 1905-11-14
Anticipated expiration: 1922-11-14

Description

No. 804,727. PATENTED NOV. 14, 1905. G. F. JOHNSON.

SAFETY BARREL FOR WATCHES.

APPLICATION FILED MAILZS, 1905.

UNITED sTAT s PATENT OFFICE.

GEORGE F. JOHNSON, OF SPRINGFIELD, ILLINOIS, ASSIGNOR TO ILLINOIS WATCH COMPANY, OF SPRINGFIELD, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed March 25,1905. Serial No. 252,016.

To aZZ whom, it may concern:

Be it known that I, GEORGE F. JOHNSON, a citizen of the United States,residing at Springfield, in the county of Sangamon, State of Illinois, have invented certain new and useful Improvements in Safety-Barrels for l/Vatches, of which the following is a specification, reference being had to the accompanying drawlngs.

My invention relates to safety-barrels for watches; and its object is to construct a main wheel and spring-barrel of new and improved structure in which a simple and elficient means is provided for combining the springbarrel, the main-wheel arbor, the ratchetwheel, and their settings. The parts are also so combined that in case the spring breaks the sudden release of the spring will not put a strain upon the works, but will be thrown 01f through the rotation of the ratchet-wheel.

To these ends my invention consists in the combination of the parts hereinafter described.

In the drawings, Figure 1 is a section through the ratchet-wheel portion of the movement plate, spring barrel, and main wheel. Fig. 2 is a horizontal section on the line 2 2 of Fig. 1. Fig. 3 is a horizontal section on the line 3 3 of Fig. 1.

Referring to the drawings, t indicates a ratchet-wheel which is provided with a suitable hub 5, preferably formed integral therewith, as is best shown in Fig. 1, and which is journaled in a suitable circular opening in a back movementsplate 6, which is recessed, as is shown in Fig. 1, in the usual manner for the reception of the ratchet-wheel 4L.

7 indicates a spring-barrel which is of the usual form of a short hollow cylinder and which is provided on its upper surface with a circular boss 8, which fits within a suitable wheel 4 and is held in place by the heads of the screws 9.

11 indicates a jewel which is secured in place by the jewel-setting 10. As is clearly shown in Fig. 1, the hub 5 and the springbarrel 7 are provided with a suitable opening through which a spring-arbor, hereinafter described, passes.

12 indicates the main wheel, which is of the shape of a short hollow cylinder, within the top portion of which the lower edge of the spring-barrel 7 enters.

13 indicates the spring-arbor which is secured in the main wheel 12 and projects upward therefrom, being held in position so that the two will rotate together bya squared portion 14. (See Fig. 3.)

15 indicates a hub which is screwed upon the spring-arbor 13 within the spring-barrel 7 and main wheel 12. The mainspring of the watch is in the usual manner secured at one end upon the hub 15 and at the other end to the inner surface of the barrel 7. The spring-arbor 13 is provided at its lower end with a pivot 16, adapted to be journaled in any suitable bearing in the watch (not shown) and in the usual manner, and at its upper end with a pivot 17, which is journaled in the jewel l1.

When the watch is wound,the ratchet-wheel l is rotated, turning in the back movementplate 6 and carrying with it the spring-barrel 7, winding the spring. \Vhen the winding is completed, the ratchet-wheel being held from rotation in the opposite direction from that in which it was wound, the uncoiling of the spring will of course rotate the springarbor and with it the main wheel.

In case the mainspring should break it will be seen that the construction is such that the releasing of the strain upon the spring will cause the spring-barrel 7 to rotate in the direction in which it was wound, thus permitting the ratchet-wheel to move and preventing a sudden throwing of the strain upon the more delicate parts of the watch.

IVhat I claim as new, and desire to secure by Letters Patent, is

As an improvement in safety-barrels for Watches, the combination with a movementand removably secured to said ratchet-wheel, plate, a ratchet-Wheel having an integral hub a main Wheel, and a spring-arbor secured at [O journaled in said movement-plate and proone end of said main Wheel and journaled at vicled With a concentric recess upon its under the other end, substantially as described.

5 side, and a jewel concentrically mounted in GEORGE F. JOHNSON.

said ratchet-Wheel, of a, spring-barrel pro- Vitnesses:

Vided with a boss on its upper surface adapted GEORGE A. BATES,

to enter the recess in the bottom of said hub AMY SPURWAY.