US341025A

US341025A - letzing

Info

Publication number: US341025A
Authority: US
Publication date: 1886-05-04
Anticipated expiration: 1903-05-04

Description

(-No Model.) 3 Sheets-Sheet 1.

C. J. LETZING.

LOOK.

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C. J. LETZINGQ LOGK. No. 341,025. Patented May 4, 1886.

(No Model.) 3 Sh'e'ets-Sheet 3 O. .J.- LETZING.

I LOOK. No. 341,025. Patented May 4. 1886.

z I I UNITED STATES PATENT OFFICE oHRIsrIAN J. LETZING, or BosroN, MAssAcHusn'rrs.

LOCK.

S'PECIPICATIN fonning part of Letters Patent No. 341,025, dated May 4, 1886.

Application filed July 27, [885.

To aZZ 207mm it may concern- Ee it known that I, CHRIsTIAN J. LETZING, of Boston, in the county of Suffolk and Commonwealth of Massachusetts, a citizen of the United States, have invented a new and useful Improvement in Door-Locks, of which the following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming a part of this specification, in explaining its nature.

The object of the invention is to provide means whereby a door upon being unlocked may be opened but a limited distance, and also in various details of construction, all of which will be hereinafter fully described.

Referrin g to the drawings, Figure 1 is a perspeetive view reprcsenting the application of a lock containingthe features of my invention to a door. Fig. 2 is a view in horizontal section, representing the door closed in dotted lines and open in full Outline. Fig. 3 is an enlarged view in elevation of the lock, looking from behind, to show its interior construction, and also to represent the parts when the latchbolt is in its protracted position. Fig. 4 is a view in elevation of the same parts when the latch-bolt is in its normal position. Fig. 5 is a detail view, and Fig. 6 is a modification hereinafter referred to.

A represents a door provided with a lock having the features of my invention..

` B represents the frame-work about the door.

O is the lock. It has a latch-bolt, c, which is provided with the inclined edge 'or face c', the long slot c', and the passage or entrance c3 to the slot,which extends from the end of the slot. This latch-bolt is movable in relation to the casing of the lock, as hereinafter specified, and it is adapted to engage with the catch D, which projects outwardly from the inner surface of the frame of the door. This catch consists of the part (l, having screw-holes d', by which the catch is fastened in place, and the comparatively thin outward-extending plate dz, having the Shoulders (P, Fig. 5. This plate dZ is somewhat less in thickness than the width of the passage or entranee 03 to the slot of the latch-bolt, and when the door is closed said latchbolt is adapted to project upon this plate, the portions c' bearing against the shoulders (ZS, as represented in Fig. 5. These shoulders Serial No. 172,713. (No model.)

limit the movement of the door so that it may be opened alimited extent, and then locked, I move the lateh-bolt outward beyond the plate dz, so that the slot 03 comes beneath the shoulders d3 of the latch, and, the slot being wider than the Shoulders, I am then enabled to open the door, the latch-bolt passing by the shoulders onto the bar E, which is of a greater width than the width of the entrance 'or passage c3 to the slot, so that the latch as the door is moved outward rides on the swinging bar until it comes in contact with the stop c. This construction effectuall y prevents the door from being opened a greater distance than is desired, the distance being regulated by the length of the swinging bar.

In closing the door it maybe shut in the ordinary manner, or the'bar E may be used as a lever in returning the latch-bolt to a position within the line of the shoulders (13, and it will automatically return to its normal position.

There are many ways, of course, by which this latch-bolt may be provided with the necessary movements, and in the drawings I have illustrated one of these ways only. The latch-bolt c has a shank, ci, extending back- Ward, and provided with a slot, cs, which receives the guides or blocks cl, projeeting out.- ward from the casing of the lock, to act as guides in connection with the slot. The shank also has two pins, cs, projecting outward therefrom, and they are engaged by the arni f, extending outward from the barrel f turned by the door-haudle ft'. A spring, f3, serves to automatically return the barrel. A spring, fi, bears against the shoulder f' upon the latchbolt, and holds it in its normal position. VThe lock also has the tu mblers f 6, which are adapted to engage the tongue7 upon the end of the lever fg, which is pivoted at f, and the end of which projects int-o the recess f 10, cut in the shank of). The lateh-bolt also has a notch, g, in its shank, for the reception' of the push-block g', Whereby the lateh is held locked, and which block also acts to lock the lateh When it is pushed forward, so that it cannot be nnlocked by the key. This block is adapted to be moved upward by the lever 92 and push-block (/3, pivoted thereto, the lever being pivoted at gf. A spring surrounds the pivot-post and bears against the lever, to eXert sufficient friction thereon to maintain the block in any position in which it may be moved.

In Fig. 6 I represent the latch-bolt with a closed slot, instead of an open one, and use in connection therewith a modified form of looking-bar. The 'locking-bar in this case being in the form of a hook, the end is adapted to act as an abutment, against which the latchbolt shall come in contact When it is used in the ordinary Way; but When said lateh-bolt is moved outward sufficiently to bring the slot in line with this portion of the hook it may then ride outward thereon, as upon the portion shown in Fig. 1. Of course this hook is pivoted to swing laterally.

The advantages' of the invention arise from the simplieity of the construction, and from the fact that the movement of the lateh-bolt only is required to bring the controlling-bar into effect.

Having thus fully described my invention, I claim and desire to secure by Letters Patent- 1. In a lock, the combination of a bolt or lateh shaped as described, and adapted to be moved by a spring to engage with a catch, and to be moved by the knob or handle out- Wardly, to be disengaged from the catch, and

to engage With the looking-bar, with the locking-bar E, and the plate d, having the shoulders (23, all substantiall y as and for the purposes 40 described.

2. The combination, in a lock, of the bolt or lateh shaped substantially as described, and adapted to be moved by a spring to engage with a catch, and to be moved by the knob or handle outwa-rd, to be disengaged from the catch to engage with thelocking-bar, the plate d, having the shoulders dB, forming the catch, the swinging looking-bar E, secured to said plate, and the cross piece, block, or

stop e, for limiting the extent of movenient of the bolt or latch, all substantially as and for the purposes dcscribed.

3. The combination of the lateh bolt c,

shaped substantially as specified, to act as a lateh and as a locking device, the Operating' arln f, spring ft, and the guides 87, and the lateh knob or handle, whereby the lateh-bolt is adapted to automatically eugage the catch, and to be moved by hand both outward and inward from the position to which it is automatically moved, all substantially as and for the purposes described.

CHRISTIN J. LETZING.

lVitn esses:

F. F. RAYMOND, 2d, FRED. B. DOLAN.