US214080A - Improvement in latches - Google Patents

Description

P. H. BAKER.. Latch.

No. 214,080. Patented April 8, 1879.

WITNESSES INVENTR I ATTORNEYS UNITED STATES PTENT-OTFIGE.-

PETER H. BAKER,y OF SAN FRANCISCO, CALIFORNIA.

I MPROVEM ENT IN LATQHES.

Specification forming part of Letters Patent No. 214,080, dated April v8, 1.879;` application filed December 30, 1878.

construction, as hereinafter setforth. and

shownin the accompanying drawings.

In the drawings, Figure 1 shows the keyhole plate and knob of the lock in position they occupy when applied to 'a door. Fig. 2 is a sectional elevationof the latch and case, with the parts in position for use as a latch. Fig. 3 is an elevation, showing, the latch locked. Fig. 4 is a section of the fade-plate and end of the case, showing the manner of .connecting the face-plate. Fig. 5 is a cross-section of the vlocking-latch as applied to a door online a:

of Fig. 1. Fig. 6 shows the key made use of to lock the latch.

Similar letters .of reference indicate corresponding parts.'

The case a. is in two parts, which, when placed together, form a hollow cylinder of suitable size and length for containing the operative parts. This form of case can be fitted by simply boring a hole in the edge of the door and sinking the'end plate b hush with the edge. To lavoid the necessityv of using screws the plate b is attached tothe end of case a by a dovetail connection, as shown in Fig. 4. The plate b has a recess, with an undercut edge at opposite sides, asat s, to correspond with the dovetail groove at the sides of lcase a. The twoparts of the case will be entered in the recess of the plate b, and the case then closed togetherat the other end, and plate b will then be held securely.

The key-hole plates c c are made concave `and of. circular form, so that the central portion,I

where the key-hole d is cutis sunk below the surface of the door, which renders it easy to ind the key-hole when there is no light. The

sunken portiouforms a circular projection at' the back of each plate c, that enters a corresponding'depression in the sides of case a.. The plates cserve to retain the case a 1n place;

and in attaching the plates c to la, door it will be only necessary to turn them around untilthe key-hole d coincides with the hole in case a, and then screw the'plate fast.

e is the latch'and bolt, beveled in the usual manner, and the portion which is within case a is slotted to receive the blocking-piece fam-l spiral spring g. The spring g, that forces the latch outward, is placed at the inner end ofthe latch-piece, and is held between the hub h and a cross-partition, t', that divides the slotof the latch-piece. The piece e passes at the upper and lower side of hub h, and is formed at the end with two oppositely -inclined surfaces, against which the arms k of hub h act to withdraw the latch.V The hub hhas a square hole for the knob-shank, as usual. A The opening in case a at the forward end, where blocking-piece fis placed, is of a size and shape to receive and guide the latch and retain the block f within the slot of the latchpiece, in which slot the piecej'is moved back and'forth by the key in locking and unlocking the latch.

l is the tumbler, which is hung to the back part of blockin g-piece f by a pin, m, and moves within a slot in the upper part off. Its forward and moving end has a T-head, that rests in oneI of the notches n, which are formed at both sides of case a.' A flat spring, secured in the back of piece'f, as shown by dotted lines, .serves to retain the tumbler f in the notches n.

. The blocking-piece f is cut out at o, and formed with a lug, p, and recesses, in which the wards of the key enterin moving the piece f. The key shown in Fig. 6 has double wards, projecting at au angle to each other, and when entered through the correspondingly-shaped key-hole and turned it iirst raises the end of tumbler l" from the notches n, and moves the piece f part way forward, the T-head of the tumbler resting on the ledge between notches n. The second ward then takes against lug p and moves piece f forward until the T end of l drops into the forward notches, u, thereby preventing back movement of fand latch e. The latch is then locked, and cannot be operated until unlocked with the key by a reversal of the operation described.

By placing the tumbler and blocking-piece.

at the forward end of the. latch the knobs are brought farther from the door-post, thereby giving more room to operate them. The latch e can be reversed to suit it for a. right or left lmnrl door.

The advantage over the latch covered b v my Patent No. 194,637 is tha-t I have so simplied it as greatly to reduce the cost of mannfacture.

Having thus described my invention, Ielaim as new and desire to secure by Letters Patent- 1. In combination with the two-part lockcase a, having dovetail grooves, as set forth, the recessed faceplate b, having undercut edges, substantially as and for the purposes set forth.

2. The combination of the latch e, having at the end oppositely-inclined surfaces and partition i, the blocking-piece f, tumbler l, hung by u pin, m, in a. notch of said block-piece, the spiral spring g, and the hub h, having arms k, as and for the purpose described.

3. The combination, with the slotted latch e, having notches n, of the slotted blockingpiece f, havin g a flat beek spring, and the tumbler l, having a T-head, the said tumbler being hung to the said piece by a pin, m, as and for the purpose specified.

PETER H. BAKER.

Witnesses:

Joint H. BEHRENS, JOHN T. FERTIG.

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