US292311A - hinton - Google Patents

Description

(No Model.) I u2 Sheets-Sheet' .1.

vJ. E. E. EINTON.

MAGNET() ELECTRICAL ALARM,

No. 292,311'. y Patented Jan. 221.884.`

a l f `NITED-STATES PATENT QEEICE.

AJOSEPH R. H. HINTON,OE Y'RALTIMORE, MARYLAND, AssIGNOR To THE vIA DUCT MANUFACTURING COMPANY OE BALTIMORE CITY, OE sAME PLACE. 1 V

MAC-:N ETC- ELECTRICAL ALARM.

SPECIFICATION forming-part of' Letters Patent No. 292,311, dated January 22, 1884.

Applicationl filed November 19, 1883. (Xo model.)

To all lwiz/0711, it may concern.-

. Be it known that I, JOSEPH R. H. HINTON, of Baltimore, in the State of Maryland, have-invented certain new and useful Improvements in '5 Magneto-Electrical Alarms; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable Others skilled in the art to which it appertains to make and use the same, reference IO being had to the accompanying drawings, and

position while the motor isbeing wound up;

2 5 to prevent the motor from running except 'when it is started at the proper time, and to provide for an initial movement of the mechanism in assistance of the weight or spring when.a signal is to be given. With theseob- 3o jects in view my improvement consists in certain novel constructions and combinations of devices, which will be fully understood from the following particular description in connection with the accompanying drawings, in 3 5 which- Figure lis a vertical section of a signal-box, showing a side elevation of the interior mechanism. Fig. 2 is a similar view, showing an elevation ofthe mechanism on the side Oppo- .IO site to that shownfin Fig. 1. Fig. 3 isa horizontal section of the box and plan View of the interior mechanism. Fig. ,4 is a similar view, showing in plan the key-retaining device within the box. a 5 The letter A indicates the frame which sup- V ports the mechanism inside of the box B.

C is the main driving-shaft, carrying a barrel, D, upon which is wound a cord, E, operated by a weight.F/. This barrel is connected 5o with the main gear-wheel Fby theordinary which in turn meshes with a pinion on a shaft,

f2, carrying a gear-wheel, f3, which meshes with a-pinion on the shaft g of the rotary armature G, arranged between the poles of a permanent-magnet, H, said armature being connected up in a well-known manner, to send a current through an electrolmagnetic bell, I, and over the wires P and-N, which are to be connected with the line-wire in the usual manner. K indicates a signal or break lwheel, of usual construction, having raised portions or-teeth arranged to make contactwith a spring contact linger, J, for sending the signals, in a manner Qwell understood by persons familiar with 'electrical fire-alar m mechanism. This break-wheel is mounted on'one end of a short shaft, having Aon itsother end a gear-wheel, L, which meshes "with a pinion, Z, on the main shaft, from which the break-wheel derives its rotary motion.

The parts which I have now referred to are old in construction and relative arrangement; but when such parts only` are used there are ldefects in the operation of the mechanism, which it is the object of my improvements to Overcome. Forinstance, when the cord is iirst wound upon the drumy and the mechanism started into operatiomthe weight will cause the main shaftto move at first comparatively slowly, and as" it continues to run the acquired momentum results in an increasing rapidity of revolution in the break-wheel, so that the intervals between the si gnaliug-impulses become less and less toward the end ofthe signal, thus giving rise to confusion. In order to overcomethis'dificulty I arrange a stationary disk,

`M, attached to the frame A. by side' lug and screws, as shown in Fig. 2, having an annular flange, m, concentric with the'shai't g of the armature. This shaft extends centrally through the disk M, and has pivoted to it, at diametrically-opposite points, two curved arms, o o, arranged to be swung Outward by centrifugal force. These arms are so weighted that when the rotation of the armature-shaft reaches the desired speed they will y outward and imfpinge againstthe iiangemwith such friction as IOO to prevent that speed from being exceeded, and a uniform speed of rotation is thus secured in the break-wheel, which, as it will be reinembered, is connected with the armature-shaft by intermediate gears. Theposition in which the break-wheel stops after giving a signal is that from which it should start' on giving a subsequent signal; but unless some provision is made for holding it in such position it is liable to be moved therefrom during the winding up of the cord, or a spring, if the latter should be used to give the motive power. I have therei'ore contrived an automatic brake mechanism which will prevent all movement of the train while the barrel is being wound up. The barrel has projecting from one side a sleeve-shaft, C, which lits over the main shaft G and prolject-s outwardly beyond the frame A, as shown in dotted lines, this projecting portion being squared to receive a key, Q, the barrel q of which hasa corresponding socket to ht over this project-ing squared portion of the barrelshaft. To the side of the frame A from which the barrel-shaft projects is pivoted a bent lever having a long arm, R, tothe outer end ofwhieh is iirmly secured at one end a transverse rod, a', having pivoted upon its other .end a brake-shoe, S, arranged to bear upon the periphery of the gear-wheel f, which meshes with the pinion upon the armatureshaft. The other arm, R', of this bent lever `curves over the squared projecting portion ot' the barrel shaft in such position that when the barrel or tube of the key is placed upon this shaft, said tube will force the arm R upward against the tension of the springt, and consequently the arm R will be swung downward, and the brake-shoe carried by the rod 1 will be pressed against the periphery of the wheel f with such force as to prevent the train from moving as long as the key is in position for winding up the barrel, and thus closing the winding operation, and the breakwheel, which is connected with the train, will be absolutely prevented from moving from the position in which it stops prior to the commencement ot' the winding. The tip ot' the key-tube should be beveled in order to facilitate its passage under the arms R. In the present instance a weight is used t give the motive power, and this weight and its cord will obviously commence to operate the train as soon as the key is removed, unless means are provided to prevent the movement of the train until such time as the signal is to be given. I have, therefore, placed upon the barrel-shaft a ratchet-wheel, u, with which enf gages a pawl, a', pivoted to the frame A, and provided with a thumb-piece, u2, by which it may be raised. This pawl prevents the operation of the train by the weight as long as it remains engaged with the ratchet-wheel; and the first act, therefore, which is necessary in starting the train is to throw this pawl back out of engagement with the ratchel-wheel. This being done the weight may descend to operate the train,and n order that it may have a sufficient downward movement, the loor or bottom of the box is provided with a movable section, b, which is attached to the door b', so that when the door is opened this section will be removed from under the weightand give it free passage downward. It will be understood that,after a signal is sent, the train is to be wound up ready to give a subsequent signal when required, the necessary operation for giving such signalbeing, usually, simply to open the box and throw back the pawl u', as before explained. It may, however, sometimes be necessary to give the train an initial movement in assistance of the weight, as it is not desirable to use a weight so heavy tha-t it will always promptly start the train. A much smaller weight will suiiice to efiieiently operate the train after it is once started than would be required to start it promptly after the detaining-pawl is thrown back. In order to give the train an initial movement, I have arranged under the shaft f, which carries thegear-wheel f, a shaft, j, carrying a pinion, f5, meshing with said gear-wheel. This shalt has a projecting portion provided with a thumb-piece, u, by which it may be turned, and also with a ratchet-Wheel, w', with which engages a detent-pawl, w. On openingthe box and turning back the detent-pawl u', the person sending the signal should turn the thumb-piece w in the direction indicated by the arrow, thus causing the pinion f 5 to turn the gear-wheel f and give an initial movement to the train. A slight initial assistance only is needed, as the train being once started, the weight will continue it in operation until it runs down. In order that the key forwinding up the barrel may not be displaced or lost, it is desirable thatitshould remain in the box; and in order that it should so remain I have provided the door of the box with springfinger y, (shown in dottedlines,) which,when the door is closed, will catch over a shoulder, q', formed Ion the key, and when the door is opened will automatically draw the key o the winding-- shaft and release the brake. These springingers will support the key when it is not in use, and it may be readily detached from said fingers when required for winding up the train.

Any of the suitable and well-known devices may be used for determining the number ot' revolutions to be made by the break-wheel in giving each signal.

Having now described my invention and explained the operation thereof, I claim- 1. The combination, with the train of gearing operating the signaling device, of a brake arranged for application to one of the wheels of such train, and adapted to be thrown into frictional contact therewith by the insertion of the winding-key, substantially as shown and described.

2. The combination, with the train having the barrel-shaft projecting and adapted to receive a key, of the pivoted bent lever having IIO will

an arm, R, carrying brake arranged for application to one of the Wheels of the train, and an arm, R', arranged adjacent to the projecting key-*receiving portionof the windingshaft, and in such position as to be movedby the key for applying the brake, substantially as shown.

3. The combination, with the Winding barrel and its shaft, of the auxiliary ratchet-wheel u and the pivoted paWl u', provided With a thumb-piece, substantially as described, and for the purposeset forth. 4

4. The combination, Awith the actuatingl Weight and thetrain, of the shaftj, carrying the pinion f5, meshing Wit-h one of the wheels of said train, and provided With'a thumb-piece by which it may be turned, whereby an initial movement is given to the train, overcoming JOSEPH R. H; HINTON.

XVitnesses:

H. S. DUNN, Trios. `KELL BRADFORD.

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