US252175A - Striking mechanism for electric bells - Google Patents

Description

(Model.)

7 G. E. BOWERS. STRIKING'MBGHANISM FOR ELECTRIC BELLS.

N'0.;252-,1'75 Palsented Jan. 10,1882.

INVENTOR WITNESSES ATTORNEYS.

UNITED STATES PATENT OFFICE.

GEORGE E. BOWERS, OF FITGHBURG, MASSACHUSETTS.

STRIKlNG MECHANISM FOR ELECTRIC BELLS.

SPEGI FIOATIO N formingpart of Letters PatentNo. 252,175, dated January 10, 1882.

' Application filed September 8,1881. (ModoL) To all whom it may concern:

Be it known that I, GEORGE E. BoWERs, of Fitchburg, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Striking Mechanism for Electric Bells, of which the following is a full, clear, and exact specification.

My improved mechanism providesforalong stroke of the hammer, movement of the hammer always in one direction, compactness of construction, and a positive stop in a manner requiring but slight force to release the striking mechanism.

The invention consists in a hammer in the form of a segment of a ring, hung 011 ashaft that is revolved by a weight or spring and released by movement of the armature of an electro-magnet, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming part of this specification,-in which similarletters of reference indicate corresponding parts in all the figures.

In the drawings, Figure lis asideelevation of an electric gong embodying my invention. Fig. 2 is a front view of the same. Fig.3 is a detail side view of the hammer and its shaft, in section, on line a: a: of Fig. 2. Fig. 4. is an edge view of'the hammer, and Fig. 5 is a detail section on line y y of Fig. 2.

The bell and mechanism are supported by a bracket consisting ofa ring, A, and arm B, to which the ring is attached.

G is the gong, suspended from the upper side of ring A.

D is the magnet, hung on arm B.

a is the pivoted armature-lever, which draws downward from the poles ofthe magnet by its weight, assisted by a spring, if required.

I) is a stop for the armature.

c is a shaft-carryingIa winding-drum,rl, from which a weight, 6, is suspended bya cord that passes overafriction-rollenf.

g is the hammer-shaft, provided with a fast pinion, h, meshing with a gea1- wheel,a, on shaft 0.

E is the hammer, hungloosely byan arm, i, on the shaft g. 0n the shaft is a ratchetwheel, 7r, that is engaged by a pawl, I, hung on the hammerarm 11, so that the hammer is carried by the shaft when the shaft is turned by the weight 0.

The hammer E is the segment of a ring, pivoted at one end by a pin, m, to the arm 7;, so that its outer end is free to swing in and out a distance limited by a stop-pin, a, that projects through a hole in a tail of the hammer. Aspring, 0, from the pawl l to the hammer, serves to retain the hammer end inward, and also as a spring to retain the'pawl in place. The hammer-arm z'has an extensiomp, curved in the same are as the hammer, and. forming a tail to the hammer. On the end of this tail portion 19 is a cross pin, q, and on the armature-lever a are two lugs or projections, r r, placed one for contact with the end of pin q when the armature is down, and the other for contact therewith when the armature is raised in contact with themagnet. This contact with the lugs r by pin q arrests the hammer and prevents its being revolved by the weight.

The location of the curved hammer is below the edge ofthe bell, atone side, in such position that. the hammerstrikes at about the end of its upward movement. As the shaft 9 carries the hammer, the centrifugal force acting on the long arm overcomesthe resistance ofthe spring acting against the short arm and throws the end of long arm out, so as to come in contact with the bell, which checks it and allows the spring on short arm to force the end of long arm inward, when it passes the bell and moves on until arrested by the pin q and upper lug 1". When the armature is raised by closure of the circuit to the magnet the upper lug r is raised above pin q and the lower lug 1' brought behind the pin. When the armature drops by breakage of the circuit the lower lug r is carried down, and the pin q being entirely released, the hammer revolves, and the blow is struck at completion of the revolution.

It will be seen that the movement of the hammer is continuous in one direction, so that there is no loss of power. The hammer has a long stroke and moves with increasing momentum. The position of the hammer at rest is such that it partially balancesthe driving power, so that but a slight magnetic force is required to release the hammer; and, further, the stop action-is positive and endwi se of the armature.

A pawl, s, on the bell-frame engages the notched hub t on-the hammer-arm i, and serves to retain the hammerin position, if at any time the impelling'forc'e is relieved.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with the shaft 9, carryin g ratchet-wheel k, of the hammer E, hung loosely on arm 1', projecting from shaft 9, the stop-pin n, passing through a cross-slot or hole in the hammer-tail p, the spring 0, and. the pawl l, pivoted on said arm 15, whereby the hammer is adapted to be operated :with respect to the bell as described.

2. The combination of segment-hammer E, propelling-shaft g, arm 6, tail-piece 12, provided 20 with pin q, and the armature-lever 11, provided with lugs r, substantially as shown and de-' scribed.

3. The combination of the impeding-shaft g, ratchet k, pawl 1, 'arm 5, pivoted hammer E, 25 and stop-lever a, substantially as shown and described, for operation as set forth.

GEORGE E. BOWERS.

VVitrie'sses:

" B. J. HAMMOND,

' L. O. ALBEE.

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