US345016A - Door-latch - Google Patents

Description

(No Model.)

E. S. WINGHBSTER.

DUUR LATCH.

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NTTED STATES PATENT OFFICEG EDVARD STEVENS WINGHESTER, OF DORCHESTER, MASSACHUSETTS.

DOOR-LATCH.

. SPECIFICATION forming part of Letters Patent No. 34:5,016I dated Ju1y6I 1886.

Applicationfiled April 7, 1896. Serial No. 198,106. lNo model.) Y

To all whom it may concern:

Be it known that I, EDWARD STEVENS WIN- oHEs'rER, of Dorchester, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Door-Latches, of which the following is a specification.

The aim of my invention is to provide an ilnprovcd construction under which a springactuatedlatch-boltwillbe automaticallylocked in its retracted position when operated by the knob, as usual,and automatically released when vthe door is closed, and this through the inertia of an internal weight and without the ernployment of projecting trip devices.

The invention further consists in combining with the latch-bolt a detent to hold the same automatically in a retracted position and connections between the detcnt and the knob or spindle, so that the latch may be unlocked through the medium ofthe spindle, at the will of the operator.

The invention further consists in various details of construction, which will be hereinafter more fully explained.

My improvements are susceptible of embodi ment in various forms, the equivalents of each other, which will readily suggest themselves to the skilled mechanic after a reading of the specification.

I have represented in the drawings those forms of embodiment which are best adapted for general use.

In the drawings, Figure l is a side view of a latch containing my improvements, the side plate of the casing being removed to expose the internal parts to view. Fig. 2 is a vertical cross-section of the same on the line a: w, Fig'. 8 is a perspective view in the nature of a diagram, showing my improved detent devices as represented in the previous iigures.' Fig. 4t is a diagram illustrating a modified form of the detent.

Referring to the accompanying drawings, A. represents the casing of the latch; ]3, the horizontally-sliding latch-bolt, beveled at its forward-end and provided with a rearwardlyextendingv spindle, a, encircled by a spiral spring, b', which serves to project the latch beyond the casing when itis released, in a manner familiar to the lock-smith.

C represents a horizontally-sliding yoke-bar urged constantly forward by a spring, o, its rear end being forked, and its arms adapted to engage in an y,ordinary manner the rocking stump ortumbler D, to which the external knobs will be connected by an ordinary spindle, or otherwise. The rotation of this stump in either direction serves to retract the yokebar C. At its lower end said yoke-bar C has a projecting lip, d, entering a notch in the upper edge of the latch-bolt. This notch is of such width that it will permit the latchbolt to be retracted, as shown in Fig. l, until its forward end is wholly Within the casing without moving the upper yoke-bar, O. When, however, the latch-bolt is forward, the retraction of the yoke-bar C will cause its shoulder d to retract the latch-bolt. Thus it is that by turning the knob or spindle the latch-bolt is positively retracted.

In applyingmyimprovementImountwithin the latch-case in any appropriate manner a weight, E, movable transversely within the casing, and connect it with the latch-bolt in such manner that when the latch is retracted it will be automatically held in its retracted position until the door is closed, and then released through t-he inertia of the weight.

In Figs. 1, 2, and 3 the weightEis supported by two horizontal arms, e, its upper and lower edges mounted on vertical pivots f in the latch-casing, tween the weight and the side of the casing, urges the weight in the direction indicated by the arrow in Fig. 2'. At its upper edge the weight has an arm or detent, h, and on the A spring, 7c, applied bel stem of the latch-bolt there is formed a shoulder, i. When the latch-bolt is retracted, the detent h engages the shoulder i and holds the bolt in its retracted position, as shown in Figs. l and 3. When the door is closed against the jamb or other stop, the inertia of the weight causes it to continue its motion, overcoming the spring k, and to swing forward until its arm h discngages the shoulder z', the effect of which is to release the latch-bolt and permit it to slide forward,under the influence of spring b, into engagement with the keeper. In this form of the device it will be observed that the weight is forked or divided, thus affording a IOO parts, which may be of any ordinary construction. This construction of the weight is advantageous in that its operative end is permitted to swing around a distant pivot,whcre by its action is rendered smoother and less violent than would otherwise be the case.

In Fig. 4L I have represented one of the varions modified forms of the weight. In this instance the weight is supported on a horizontal pivot and its upper end arranged to engage directly with the stem of the latch-bolt.

As it is sometimes desirable to release the latch-bolt by hand, either before or after closing the door, I construct the stump r tumbler D so that it may move transversely of the casing--that is to say, in the direction of its own axis-to a limited extent, and provide the weight E with an upwardlyextending arm or detent, m, which bears against the sides of an annular collar formed on the stump, as shown in Figs. 1, 2, and 3. By pushing vthe stump of the lock, and a detent acting in connection with said weight to hold the latch-bolt automatically in its retracted position.

2. In a latch, the combination of a horizon tally-movable latch-bolt having its stem provided with a shoulder, the horizontally-swinging weight having a detentarm to engage said shoulder, and aspring acting to urge the weight in the direction in which the door is opened.

3. In a latch, a movable latch-controlling weight forked or divided, substantially as described, to loosely embrace the lockbolt,where by the employment of a long weight is permitted without interference with the lock. l 4. In a door-latch, the combination of a spring-projected latch-bolt, a rocking tumbler or barrel toeffect its retraction, said tumbler adapted to move in an axial direction, and an automatic detent engaging the latch-bolt to hold the same in its retracted position, and adapted to be disengaged by the axial motion of the tumbler.

5. In a door-latch, the spring-projected latch B, the spring-projected yoke C, having a loose connection with the latch, the tumbler D, having both a rotary and an axial motion, and the movable detent to engage the latch-bolt, provided with an arm engaging the tumbler.

In testimony whereofI hereunto set my hand, this 22d day of March, 1886, in the presence of two attesting witnesses.

' EDWARD STEVENS WINCIIESTER.

Witnesses:

JAMES SMITH, MARY S. WINCHESTER.

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