US304080A

US304080A - Edwabd da vies

Info

Publication number: US304080A
Authority: US
Publication date: 1884-08-26
Anticipated expiration: 1901-08-26

Description

E. DAVIES.-

ALARM 0LO0K.

(Model.)

Patented Aug. 26, 1 884.

INVBNTOR M ATTOR YS.

plied thereto.

UNITED STATES PArn'r tries.

EDWARD DAVIES, OF BROOKLYN, NEXV YORK.

ALARM- CLOCK.

EBPEC'IFIGATION forming part of Letters Patent No. 304,080, dated August 26,1884. Application filed January 24, 1884. (Model.)

To aZZ whom it may concern:

Be it known that I, EDWARD DAVIES, of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Alarm-Clocks, of which the following is a specification.

This invention relates to an improved alarmclock of that class in which the mainspring is employed for actuating the time-movement of the clock as well as the alarm mechanism of the same, the means employed for this purpose being of simple construction, and so arranged as to be within view, whereby the irregular functioning of the alarm mechanism is avoided.

The invention consists of an alarm drivingwheel placed loosely upon said arbor and taken along by a pawl-and-ratehet device, a pinion keyed to the winding-arbor and meshing with a stop-gear wheel, that is provided at one part of its circumference with segmental tooth and adjoining thereto with a recess of larger size. A spring attached to the rear wall of the clock-frame engages apin upon the stop-gear wheel, and causes the latter to skip the teeth of the pinion when the mainspring is wound up, so that the pinion and its stop-gear are in a position to admit the working of the alarm-movement when the alarm is liberated.

In the accompanying drawings, Figure 1 represents a sectional side elevation of an alarmclock with my improved alarm mechanism ap- Fig. 2 is a rear elevation of the clock-movement. Fig. 3 is a vertical trans verse section through the mainspring, showing the winding-arbor and alarm stopmotion;'

and Figs. 4 and 5 are detail views of the alarm stop-motion, showing it respectively in position after the alarm has been sounded and in position ready for starting.

Similar letters of reference indicate corresponding parts.

A represents the movement of an alarmclock of that class in which the mainspring is employed for actuating the time and alarm movements. B is the winding-arbor, and O the mainspring, the inner end of which is attached to the arbor, while the outer end is attached in the usual manner, by a stud or other fastening device, to the main drivingwheel D of the time-movei'nent The main drivingwheel D is loose upon the arbor B, so as to turn freely thereon in'following the expansion of the mainspring 0, but connected thereto by the usual pawl and ratchet-wheel. On the other side of the mainspring is located upon the arbor B the drivingwheel E of the alarm-movement. This wheel is also loose upon the arbor B, but connected thereto by a pawl, c, which is pivoted to the wheel E, and kept by a spring in engagement with a fixed ratchetwheel, f, on the winding arbor B. Then the arbor B is turned so as to wind up the mainspring O, the ratchet-wheel f skips past the pawl e, while, when the winding is interrupted, the pawl c engages the ratchet f, and checks thereby the unwinding of the spring. To the winding-arbor B is further keyed a pinion, F, which meshes with a stopgear, F, that is loosely mounted on a short 1ndependent shaft, F, that is secured to the clock-frame. The gear-wheel Fis provided at one point of its circumference with segmental tooth g of nearly twice the length of a common tooth, and adjoining thereto with a recess, h, which latter is formed by breaking out a tooth on the circumference of the gearwheel. The segmental tooth g forms the stopping-tooth of the alarm stop-motion, while the recess h, adjoining the stop-tooth g, permits the turning of the arbor B, when the mainspring is wound up,withoutbeing blocked by the stop-tooth g.

To keep the teeth of the stop gear-wheel F in mesh with the teeth of the pinion F, a spring, t, that is attached to the rear wall of the clock-frame, presses by its free end on a latter into mesh with the pinion F, as shown in Figs. 2 and 5. Each tooth of the pinion moves the stop-gear F far enough so that the tooth of the stop-gear next to the recess h is cleared, after which said tooth isgmoved by the spring 2 and pin 1; into contact with the next following tooth of the pinion F, as indicated in Fig. 5. The stopgear F does not therefore interfere with the winding up of the clock.

Any well-known alarm setting and liberating devices may be used in connection with my improved stop-motion, which devices re- 1 quire no special description. Whenever the l alarm is liberated at the time for whichthe a pin, 2', of the stop-gear F and returns the same has been set by the mechanism arranged for this purpose, the main driving-wheel. E of the alarm-movement actuates the train ofgcarwheels which oscillate the hammer that is fast 011 the pallet-spindle of the escapement-wheel of the alarm-movement, sothat the gong is sounded. The action of the inner end of the mainspring O on the arbor B and the alarm driving-wheel E rotates the latter and turns simultaneously thepinion F. This pinion, bein g in mesh with the stop gear-wheel F, turns the same in the direction of the arrow shown in Fig. 5 until the stop-tooth g abuts against one of the teeth of the pinion F, as shown in Fig. 4, and causes thereby the stopping of the alarm movement. The stop-gear wheel F remains in this position untilbythenext winding up of the clock the pinion F is turned in the direction of the arrow marked thereon in Fig. -;l-, whereby the intermeshing stop-gear wheel F is returned from the position shown in Fig. lto the position shown in Fig. 2. In continuing to wind up the mainspring the springacted stop-gear ships the teeth of the pinion F, as indicated in Fig. 5, until the spring is entirely wound up, leaving the pinion F and stop-gear F in a position for allowing the alarm-movement to be actuated whenever the alarm is liberated. The alarmmovement continues to act during the time in which the stop-tooth g moves around from a position at one side of the pinion F to its position at the other side of the same, when the looking oi" the pinion]? by the stop-tooth g, and thereby the stopping of the alarm-movement, takes place. The action of the alarmmovcment, and consequently the unwinding of the inner end of the mainspring, is thereby restricted to the distance through which the stop-tooth 9 travels until it comes around to its stopping contact with the teeth of the pinion F, as shown in Fig. 4.

It will be seen that the alarm-movemcnt is restricted to less than a single turn of the arbor B, so as to require but a small portion of the force of the mains n'ing to actuate the alarm-1novement. If it is desired to use even a smaller part of the power of the mainspring, the solid portion y is extended along a greater part of the circumference of the stop-gear F,

whereby the action of the alarm-movement is restricted to a fractional part of a rotation of the alarm driving-wheel 15.

In my improved alarm stopanotion the ringing of the gong is not confined to one entire alarm driving-wheel, or to a fractional rotation of the same; but the alarm may be kept striking for several turns of the alarm driving-wheel by simply establishing the proper porportion of the number of teeth of the pinion to the number of teeth of the stop-gear. If, for instance, the pinion has six and the stop-gear twelve teeth, the alarm will be kept ringing for two turns of the driving-wheel, while with [our tcethof the pinion and twelve of the stop-gear the alarm will. be continued for three turns of the driving-wheel and so on. When the alarm-movement is started and has completed its motion, it is stopped positively and uniformly by the stop-tooth 1 when itabuts against the teeth of the pinion.

The resetting of the stop-gear F into a position to admit the operating of the alarmmovement is accomplished by winding up the clock, as before described.

I prefer to arrange the alarm slop-motion, composed of the pinion F, stop-gear F, and spring 15, on the outside of the clock-frame, as shown in Fig. 2, instead of at the inside,wl1ereby said gears can readily be seen and any irregular position be readily corrected.

Having thus described my invention, I claim as new and desire to secure by Letters Patcnt- The combination, with the winding-arbor l3, mainspring G, and alarm driving-wheel lil, connected by pawl and ratchet to the wint'ling-arbor, ot' a pinion, F, keyed to the winding-arbor, a stop-gear, F, meshing with the pinion, and having an enlarged tooth q, an adjoining space, 71, and a pin, '5, engaged by a spring, 2', attached to the clock-frame, substantially as and for the purpose set forth.

In testimony that I claim the loregoi ng as my invention I have signed my name in presence of two subscribing witnesses.

EDWABD DAVIES.