US550423A - Combined latch and lock - Google Patents

Description

(N0 Modhel.)

w .& Iii- V A. A.;SMITH. COMBINED LATCH 'AND LOGK.

UNITED STATES PATENT OFFICE.

ANDREIV A. SMITH, OF HOTOHKISS, ASSIGNOR OF ONE-HALF TO WILLIAM H. CROTSER, OF DELTA, COLORADO.

COMBINED LATCH AND LOCK.

SPECIFICATION forming part of Letters Patent No. 550,423, dated November 26, 1895.

Application filed May 14, 1895. Serial No. 549,279. (No model.)

To all whom it may concern.

Be it known that 1, ANDREW A. SMITH, a citizen of the United States, residing at Hotchkiss, Delta county, Colorado, have invented certain new and useful Improvements in a Combined Latch and Look, of which the following specification contains a full, clear, and exact description, reference being had to th accompanying drawings, in which Figure 1 is a side elevation of the improved combined latch and lock with the knob shown in dotted lines. Fig. 2 shows a portion of the door provided with the escutcheon, which has a keyhole and knob-spindle opening, the knob being shown in dotted lines. Fig. 3 is a rear view of the latch-frame. Fig. 4 is a detail perspective of .the latch removed. Figs. 5, 6, and 7 are details showing the locking-dog, the knob-spindle tumbler or cam, and the key.

My invention relates to that class of latches which are provided with means for preventing retraction of the latch. The object of the invention is to'provide such a latch with a pivoted dog or detent having a hub provided with key-engaging device, by which it may be rotated to throw the dog or detent into its active and inactive positions, the latch being incapable of retraction after being released so long as the key remains in the said hub; also, to provide the latch with a skeleton frame adapted to be inserted in a mortise; also, to render such latch simple and inexpensive and capable of being easily repaired.

A represents the skeleton frame, which is formed in two pieces without the necessity of side plates. This frame consists in the faceplate A and the three-sided back plate or rim A the ends of which are provided with apertured off-sets a a, through which are passed the rivets or screws a a, which secure the two parts of the frame together. The inner face of the face-plate A is formed with an apertured lug o to which the latch-operating spring is secured, as will be presently more fully described. Upon the outer side of the lower corner of the back plate A is formed a pair of spaced bearings a", the space between which registers with a slot a, extending through the back plate or rim A as shown in Fig. 3.

B is the latch, sliding through the usual opening in the face-plate and having a reduced rear end sliding through an opening in the rear side of the back plate A and provided at its extremity with a head B. The latch Bis provided between its ends with a depending bifurcated arm B the lower end of which is provided with a transverse opening B intersecting the bifurcation or slot 1).

O is the locking dog or detent, having a curved or T head at its free end and an aperture c in its rear. This apertured end of the dog or detent O is passed into the slot or bifurcation 12 until it registers with the opening B when the hub O is inserted. The tubular hub O turns freely in the opening B but will fit firmly in the aperture 0, so that when the hub is turned the dog or detent will be turned with it.

The dog or detent. C may be swung from,the position shown in full lines, Fig. 1, to that shown in dotted lines, the slot or bifurcation I) being long enough to allow the dog to swing freely through it. The ends of the hub O are provided with notches c at opposite sides of its central bore or key-opening to receive the bits of the key D. (Shown in Fig. 7.)

E is the knob-spindle cam or tumbler, having the usual arms or tappets e c and having a hub 6 which is mounted in the bearings a This hub has a squared opening, as usual, for the knob-spindle, and it is connected with the arms or tappets e e in the same manner as the dog 0 and its hub O are connected. The cam or tumbler E works in the space between the two bearings a and to economize space the upper arm or tappet e is adapted to work in the slot a F is a bow-spring, riveted 'at its lower end to the lug a and it extends upwardly around the cam E in engagement with both of its arms, the upper end of the spring being forked, as shown at f, to receive the rear headed endv B of the latch. It will be seen, therefore, that when the knob (shown in dotted lines, Fig. 2) is turned in either direction one or the other arm of the cam E will press rearwardly on the spring and cause it to retract the latch B. The latch may be thus retracted whenever the dog or detent is swung forward, as shown in full lines, but when swung to the rear the latch will be locked.

In both positions of the dog or detent 0 one end of its curved head will always rest on the bot-tom of the back plate A and thus maintain the dog in a horizontal position.

Upon opposite sides of the door are secured the escutcheons G, each of which has a vertically-extending keyhole g to register with the opening and notches c of the hub C, while to the right of the keyhole aknob-spindle aperture g is formed.

It will be seen that when a person inserts the key and throws the locking dog or detent to its inactive or forward position the latch cannot be retracted until the key is with drawn, and hence the danger of letting the key remain in the lock is wholly obviated.

All parts of the lock are visible and accessible for repair, &c., as there is no closed casing, and the advantages and construction of the lock may be explained by salesmen without having to take off any side plates.

Having thus described the invention, what is claimed is 1. The combination with the latch and its operating means, of a detent or dog pivoted to and carried by the latch and provided at its axis with means for engaging a key; whereby the latch cannot be operated until the key has been removed from said dog or detent, substantially as described.

2. The combination with the latch and its operating means, of a locking dog or detent, having a hub pivoted to the latch and provided with means for engaging a key by which it may be rotated to swing the dog into its active and inactive positions, substantially as set forth.

The combination with the latch having an operating spring and a knob spindle cam by which the latch is retracted, of a dog or detent having a hub pivoted to the latch and provided with means for engagementby a key by which it may be rotated to swing the dog or detent down to the rear and prevent retraction of the latch, substantially as set forth.

4. The combination with the latch and its operating means, of a locking dog or detent provided with a tubular hub pivoted to the latch and havingnotched ends to receive the key bit by which the dog or detent may be swung to the rear to prevent retraction of the bolt, substantially as set forth.

5. The combination with the latch having a bifurcated arm or bearing between its ends, a key operated hub mounted to rotate in said arm or bearing, and a locking dog carriedby and turning with the hub and adapted to. be swung thereby to the rear and block rearward movement of the latch, substantially as set forth.

6. The combination with the skeleton. frame having a face plate and a back plate or rim provided with a bearing, of the latch guided in the face and back plate, an operating spring for the latch and a knob spindle cam or tumbler pivoted in said back plate bearing and constructed to retract the latch, substantially as set forth.

7. The combination with the skeleton frame, of the latch guided therein and pro j ecting in rear thereof, of a knob spindle cam or tumbler pivoted to the rear of the back plate below the latch, and a plate or bow spring secured to the frame, extending around the said spindle-cam in engagement therewith, and connected at its upper free end with the rear end of the latch, substantially as set forth.

8. A latch comprising the skeleton frame the latch guided therein and extending through the back plate, said latch having a depending arm between its ends, a locking dog or detent having a key operated hub mounted on the lower end of said arm, and adapted to be swung down thereby into engagement with the rear wall of the back plate, a plate or how spring, the free end of which passes up behind the back plate to and connected with the rear end of the latch, and a knob-spindle cam mounted on the rear of the back plate to force the spring rearwardly and retract the latch, substantially as set forth.

9. The combination with the latch and its operating means, of a locking dog or detent pivoted at one end to a depending portion of the latch and provided with a curved or T-head at its free end adapted at its ends to rest on the bottom of the latch frame and when swung to the rear to engage the back of the frame and prevent retraction of the latch; the hub or axis of the dog having key receiving devices by which it may be operated, substantially as set forth.

10. A mortise latch consisting in the frame comprising a face plate and a back plate or band having bearings at its lower rear cornor, a latch sliding through the face plate and back plate or band, and having a depending arm carrying the locking dog having a key operated hub, the knob-spindle cam mounted on the back platebearings, the bow spring extending around the said cam to the rear end of the latch and the escutcheon having a key-hole registering with the hub and an opening registering with the spindle opening, substantially as set forth.

11. The combination with the skeleton frame and the latch, of a spring secured at one end to the face" plate and at its free end engaging the latch to project or throw it and means for retracting the latch, substantially as set forth.

ANDR'INV A. SMITH.

\Vitnesses II. R. HIoE, Gnoi H. Dnnn.

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