US223074A - Improvement in striking mechanisms for door-bells - Google Patents

Description

W. E. SPARKS. Striking Mechanism for Door-Bells.

No. 223,074. Patented Dec. 30, 1879.

UNITED STATES PATENT OFFICE.

WILLIAM E. SPARKS, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO I 85 F. GORBIN, OF SAME PLACE.

IMPROVEMENT IN STRIKING MECHANISMS FOR DOOR-BELLS.

Specification forming part of Letters Patent No. 223,074, dated December 30, 1879 application filed July 29, 1879.

To all whom it may concern Be it known that I, WILLIAM E. SPARKS, of New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Bell-Strikin'g Mechanisms, of which the following is a specification.

My invention has for its object clleapness of production by so forming the parts that after the castings are obtained they may be readily put together with but little if any fitting and without any drilling or riveting, and also to produce a double stroke with a less number of parts than has heretofore been employed; and the invention consists in the peculiar construction of certain parts, and in their combination, as hereinafter more fully described.

In the accompanying drawings, Figure 1 is a front elevation of a bell-striking mechanism which embodies my invention, and Fig. 2 is a sectional view of the same on line m 00 of Fig. 1.

The manner of hanging the hammer to the base-plate is in the nature of an improvement upon one of my prior inventions described and claimed in another application of even date herewith, and nothing shown or described in said application is intended to be claimed in this one. I

The base-plate A is formed with a pivotal stud, a, on it, and with two hooked arms, I) I), upon opposite sides of said'stud. For convenience of casting these hooked arms I) b,-I form two openings in the base-plate under the hooked part of said arms, as indicated by broken lines in Fig. 1, whereby the same may be cast without coring. I form a hole or hearing in the hammer-tail B to receive the pivotal stud a, and surrounding said bearing I form a broad disk'shaped base, 0, provided with notches on two opposite sides, as shown. The notches in the disk and the arms I) b on the plate are so located that when the hammer is swung inward toward the central post, 0, to its full extent they will coincide, and in that position the hammer may be slipped upon or off from the pivotal stud a; but when, under the influence of the spring D, the hammer is swung into position for use, as shown in Fig. 1, the edges of the disk-shaped ordinary stop 01 is employed to limit its movement.

The striking mechanism is designed to be operated by a lever, E, hung upon the opposite side of the door, as in ordinary door-bells; but it may be operated by a pull and wire attached to the lever which rides on the face of the base'plate.

I form an opening, F, in the base'plate A, for the end of the lever E to operate in, and one side of said opening I form on the arc of acircle, and with a narrow bridge, 0, which covers a narrow rabbet. The lever G is mounted on a stud,f, on the base-plate, the opening it in said lever which receives said stud being elongated somewhat, as shown. A stop, 70, limits the downward movement of the long end of said lever; but said stop maybe formed by the shoulder at the lower end of the opening behind the bridge 0, in which case the end of the lever Gr, just outside the offset m, will strike the stop formed by said shoulder, and limit the downward movement of said lever precisely the same as does the stop It. One arm of the spring bears upon the lever G to constantly force it downward. This end of the lever is also provided with an offset, m, (see Fig. 2,) which takes under the bridge 0, thereby preventing that end of the lever from coming forward out of place. A wing, n, on the hammer-tail projects over the other end of said lever, and holds that end from coming forward out of place.

The short end of the lever G has a point, 0, which, when the parts are at rest, lies just above the point on the operative edge of the hammer-tail, as shown in Fig. 1. this position the pivotal stud f is at the bottom of the slot or opening it.

By raising the end of lever E, or otherwise When in i lifting the long end of the lever G against the spring D, the lever oscillates as on a fixed fulcrum, and the point 0 forces the hammer-tail -outward until said point passes the highest point on the operative edge of the hammertail, which, under the influence of the spring D, immediately returns to its former position, and in so doing the upper side of the point 0 is acted upon by the hammer-tail to throw it downward out of the way; otherwise the 11ammer-tail could not return quickly enough to strike a blow. The slot or opening it in the lever G allows the end of the lever to move downward, and then the upper end of the slot it rests upon the upper side of the stud f, the lever being in position to oscillate as on a different center from before, as indicated by broken lines in Fig. 1.

The arm of the spring D which bears upon the leverGis shorter than the arm which acts upon the hammer-tail, and also the leverage of G is greater than that of the hammer-tail, whereby, when the parts are in the position last described, and the long end of the lever G relieved from upward pressure of the lever E, the spring acts to force the long end of lever G downward and the hammer-tail outward, and another stroke is imparted to the hammer, the short end of the lever G rising again into the position represented by full lines, in order to get out of the way of the hammertail. Thus it will be seen that adouble stroke is imparted to the hammer by a forward and backward movement of the lever G.

Although I have described the hammer-tail as pivoted and held in position in a peculiar manner, it is evident that the lever G might be secured in place in the manner herein described independently of the fact of Whether or not the hammer is held in the peculiar manner shown and described. It is also evident that the double-stroke feature of this mechanism may he employed in a device having the lever secured in any ordinary manner, as by a head on its pivotal stud.

I am aware that a single spring in door-bells has acted both upon the hammer-tail and the mechanism which operated it; also, that doublestroke bells, consisting in part of a triangular trip on the end of a lever, are old; also, thatit is old to make a wing or projection on the hammer-tail extend over the mechanism for tripping it, to hold or assist in holding said mechanism in place, all of which prior devices are hereby disclaimed.

I'claim as my invention- 1. In a bell-striking mechanism, the hammer-tail B, provided with the broad disk-shaped base 0, notched on two opposite sides, in combination with the spring D, pivotal stud a, and base-plate A, having hooked arms I) I), located relatively to the notches in said base, substantially as described, and for the purpose specified.

2. [n a bell-striking mechanism, the oscillating lever G, slotted transversely at h, and hung on a stud of less diameter than the length of the slot, and capable of oscillation, as on different centers, in combination with the hammertail and spring, all combined and operating substantially as described, and for the purpose specified.

3. In a bell-striking mechanism, the oscillating lever G, having oli'set m, in combination with the base-plate A, having bridge 6, and the hammer-tail, having the Wing at, all combined and operating together to hold the lever in place, substantially as described, and for the purpose specified.

WILLIAM E. SPARKS.

Witnesses:

Guns. F. OoRBIN, E. L. PRIOR.

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