US1937403A - Electric bell - Google Patents

Description

NOV. 28, 1933. I 5 Q O DAWES 1,937,403

ELECTRIC BELL Filed May 16. 1929 gmnnlnnnnu umlmnrg INVENTOR wrmEsses w 110.0 amas m j D ATTORNEL Patented Nov. 28, 1933 j UNHTED STAT S 1,937,403 ELECTRIC BELL Gwyn o; oljnevi s, ole Elum, Wash. 1 A eli efionjmeyls, 1929; seri lne ssasos Thisinventionrelates to electric bells.

It is one of the objects of the present invention to provide a novel and improved bell which will,

the invention illustrated in Fig. l of theaccombe simple and eificient in construction and opera- 5 tion', and which will materially reduce the electricallenergy used in the normal operation of electric bells.

A further object of the present invention isto provide a bell operating structure in which the clapper arm of the bell and the armature of the associate electro-magnet are separate and distinct units. 7 I A A further Object of the present invention is to g provide an armature and a clapper armasselnbly whereby movements of the armature and.

clapper arm will control periodic energization of their associated magnets, and whereby the frequeneyof the bell operation maybe readily ad dusted for any desired frequency.

A furt her object of the present invention is to Y provide anelectricalbell operating structure by means of which the period of encrgization of the electromagnet of theassembly will be of less sduration than in the; conventional operating lm ur now i u e 1 c A further object of the invention is to provide in a device of the character described, a clapper arm controlledcircuit controller arranged to provide a wiping contact whereby the contact surfaceswill be self -cleaning.

. g A still. further object of the present invention is to provide'a bell operatingstructure in which the armature is arranged to move in close prox- Numerous other objectsand features of i the present invention will beapparent from a consideration of the following. specification taken in conjunction with the accompanying drawing, in which- I Figure 1 is a side elevation-of one form of the bell operating structure embodying the resent invention;

Fig. 2 is a detailed view showing the relationship of the armature and clapper arm whilethe circuit is completed therethrough; and i Fig. 3 is a View similar, to Fig. 2, showingthe 3 Claims. (cl. 11-1 75 relationship of the clapper arm and armature with the circuitbroken therethrough.

.Referring more particularly to that form of panying drawing, it willbe understood that the embodiment, of the invention here presented is one form only and that the invention isnot confined to the specific structural features as herein illustrated.

In Fig. 1 of the drawing the bell has been indi- .6 cated by the numeral 10 and may, of course, be of any conventional shape .or design... Associated with the bell 10 is a clapper or hammer 11 mounted upon the extremity of a clapper arm 12, which is pivotally mounted to a. suitable supporting base, not shown;

Adjacent the pivot'point of the clapper arm 12 an angularly extending conducting crank arm 13 v is provided, the extremity of which is positioned adjacent the armature 14, the extremity ofthe armature being provided with a pair of rounded segments 15 and 16. Segment 15 is formed .of conducting material electrically connected with the-conducting arm 13, while segment 16'.is formed of insulating material. I

LThe armature 14 is pivoted to the base by th pivot 1'7, the'armature being retained in spaced relation to its associated magnets by a spring 18.- A flexible conductor 19 associated with the armature 14 is provided which extends to one of a pair of binding posts 20. The other binding post 20 is associated by a conductor .21 with a pair-of electromagnetic coils 22, the other side of whichis electrically connected with the crank 13 by a suitable conductor 23. The conductor 23 is preferably flexible and is fastened as. near the pivotal point-ofthe clapper arm as possible, thus to reduce the amountof its motion.

For controlling the length of the inward movement towards the magnets of the armature 14,- a

readilyadjustable stop screw 24 is provided,

sented, it'is understood that associated with the binding posts 20 a suitable source of potential and a-circuit controller thereforis provided, the arrangement being such that when the circuitcontroller completes the circuit of potential will be applied across the binding posts 20. r I The normal position of restof the device is-as shown in Figs. 1 and 2. When in'such position,

and When the potential isapplied across the bindproperly without insulation segment 16.

ing posts 20, the current will pass through the conductor 19, through the armature 14, and through segment 15 to the crank 13, and thus through the conductor 23 to energize the electromagnets 22. The circuit being completed through the conducductor 21 to the opposite binding post 20, the electromagnets will be energized and the armature 14 will be pivotally moved in a counter-clockwise direction as shown in Fig. 1, against the tension of the spring 18, thus forcing upwardly the clapper 11 for contact with the bell 10, the spring 25 acting as a damper of the return motion of the armature.

Insuch movement the relation of the segments to the armature 14. and the crank 13 will be as shown in Fig. 3. In such movement it will be noted that the segments move arcuately with respect to the crank 13 whereby the insulated segment 16 is the engaging portion of the armature 14 with respect to the crank 13. Thus the-circuit between the armature l4 and the crank 13 will be broken and the electromagnets will become dispresent invention that only slight inward movement of the armature 14 will be sufficient to break the contact between the segment15 and the crank 13. Thus the period of energization of the magnets is considerably less than will be found in conventional bells now in use.

A great saving of current results from the fact that the armature is permitted to return to its position of rest immediately allowing the clapper. member to travel a considerable distance to the bell and permitting it.to deliver ahammer-like blow, being entirely free from theinfluence of the armature reten- T sion springs, which in present type bells must be 'fairly strong in order to secure good electrical connection for the contacts.

During this return travelof the armature no current is flowing in the circuit. Also there is no current flowing during the return motion of the clapper arm. The current thus saved is considerable.

It will be noted further that when the striking impulse has been delivered to the clapper arm it is'free to move to strike the bell regardless of the outward movement of the armature 14 directly upon the cessation of the energization of the magnets 22.

' It will be noted that the bell will function y The segment isrecommended in bells intended'for very important service or bells designed to withstand heavy vibration, such as street car bells,

etc. The object of this insulation is ,to prevent the clapper assembly from looking. For example,

suppose a vibration forced the clapper arm and crank back against the armature before it had returned to its rest position. The clapper having no momentum would rest against the contact l5, the coils being energized would hold the armature, the current would continue to flow,'but ringing would have ceased. However, when stop screw 24 is adjusted properly, no current flows even if clapperiod or power-consuming period of the magnet is greatly diminished without diminishing the efiectiveness of the device.

demands offeconomic manufacture. understood, furthermore, that numerous changes It will further be seen that the present invention provides ready means for controlling the frequency of the periodic contact of the clapper 11 with the bell 10. It will be seen that by adjusting the spring 25 and the stop screw 24, or by adjusting the angular relation of the clapper arm or its length, the period of energization and the frequency of energization may be readily controlled, thus controlling not only the time factor involved, but'also, controlling the rate at which the bell is struck.

From the foregoing it will readily be seen that the present invention provides a novel, simple and improved construction which will be highly efficient in operation and well designed to meet the It will be and modifications, together with thefull use of equivalents, may be resorted to in the accomplishment of the present invention, without departing from the spirit or scope of the appended claims.

I claim: f a

1. In a device of the class described, a bell,

a pivoted arm with a clapper disposed adjacent the bell for striking the latter and having a contact operating member, an electro-magnet, a pivoted armature movable under the influenceof the magnet, a spring tending to move the arma- IOU ture away from the electro-magnet, the armature extending in the direction of the contact operat-' ing member and being disposed adjacent a side of the latter, the armature having a contacting surface normally engaging the contact operating member, the said contactingsurface consisting of. a conducting member and an insulating member,

with the conducting member disposed between the insulating member and the armature pivot, so that the conducting member will engage the contact operating member when the armature is,

in non-actuated position and the conducting member will be out of engagement with and the insulating member will be disposed for engagement with the contact operating member when the armature is in actuated position, and a circuit through the armature conducting member, the contact operating member and the electromagnet. f

2. In a device of the class described, a bell,

means for operating the bell, the said means having a contact operating member,'an electro-inag a net, a pivoted armature movable under the influence of the magnet, a spring tending to move the armature away from the electro-magnet, the armature extending in the direction of the contact operating member and being disposed ad-' jacent a side or" the latter, the armature having a contacting surface normally engaging the con tact operating member, the said contacting surface consisting of a conducting member and an insulating member, with the conducting member disposed between the insulating member and the armature pivot, so that the conductingmember will engage the contact operating member when the armature is in non-actuated position and the conducting member will be out of engagement with and the insulating member will be disposed for engagement with the contact operating member'when the armature is in actuated position, and a circuit through the armature conducting member, the contact operating member and the armature movable under the influence of the magnet, the armature extending in the direction tion and the conducting member will be out of engagement with and the insulating member will be disposed for engagement with the contact operating member when the armature is in actuated position, a circuit through the armature conducting member, the contact operating member and I the electrc-magnet, means to limit the movement of the armature in one direction, and resilient means for moving the armature yieldingly in the opposite direction.

' GWYN O. O. DAVIES.

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