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Publication numberUS457872 A
Publication typeGrant
Publication dateAug 18, 1891
Filing dateApr 14, 1891
Publication numberUS 457872 A, US 457872A, US-A-457872, US457872 A, US457872A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fourth to louis meisler
US 457872 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

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l l d l WITNES E I ATTORNEY 2 Sheets-Sheet 2. M. SIMON. LUCK.


No. 457,872. Patented Aug. 18, 1891.

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SPECIFICATION forming part of Letters Patent No. 457,872, dated August 18, 1891. Application filed April 14, 1891. Serial No. 388,914. (Model.)

To all whom it may concern,.-

Be it known that I, MORRIS SIMON, of South Norwalk, Fairfield county, Connecticut, have invented an Improved Door-Lock, of which the following is a specification.

This invention relates to a door-lock, which is so constructed that a double turn of the key will throw the latter entirely out of engagement with the bolt. To re-establish such engagement and permit the lock to be again opened a separate manipulation is required.

The invention consists in the various features of improvement, more fully pointed out in the claims.

In the accompanying drawings, Figure lis a front view of my improved lock with the bolt shot back. Fig. 2 is a front view of the bolt and slide with plate o removed; Fig. 3, an elevation of the principal key; Fig. 4, a front view of the lock with the bolt shot forward; and Fig. 5 a cross-section on the line Fig. 4t. Fig. 6 is an elevation of the auxiliary key.

The letter a represents the lock-case; a', the key-hole, and b the bolt adapted to be reciprocated by the key-bit. Upon the rear part of the bolt b there is placed a tilting plate c,.pivoted to the bolt by pivot c. This 4plate is held normally down in a horizontal position by a spring d, that holds the forward edge of the plate against an offset b of bolt b. The lower edge of plate c is notched, as at c2, and the beveled' edges of this notch are engaged by the key A to reciprocate the bolt. The body of the bolt is cut away below the lower portion of plate c, as at b2, so that the bolt itself is never engaged by thekey directly, but receives its motion through plate c.

During the ordinary working of the lock the key-bit engages the beveled edges of notch c2 to reciprocate the bolt to the usual extent, and to thus open or close the lock; but after the lock has been closed the key may be again revolved and will then bear against the lower straight edge c3 of the plate c, so as to tilt the plate, Fig. 4, against the action of spring d. The plate c is provided with a notch c4, which will now come into engagement with a beveled stop e on a slide e, thrown forward by aspring f. Thus the plate c will be firmly held by the slide in its tilted position and the lock cannot be possibly opened in the ordinary way.

Upon the plate c a suitable number of tumblers g should be placed, which are thus also withdrawn from the key. These tumblers are only indicated by dotted lines in Fig. l, and are entirely omitted in Fig. 4 to better expose the novel features of the lock.

Through the lock-casel passes a post h, provided with a beveled nose h', opposite a beveled edge e2 on slide e. This post carries a pair of screws h2, the heads of which project out of the lock-case. These heads arel provided with the ordinary nicks or with nicks or patterns of any desired configuration. An auxiliary key A or an ordinary screw-driver is provided with a bit adapted to fit the nick of screws h2. In order to put the lock back into its normal position either one of the screws h2 must be slightly revolved by the auxiliary key A. The theads on the screws h2 are so cut that the motion imparted to either of the screws will be transmitted to the post h. Thus the nose h will be caused to bear against the slide cto push the same backward. As soon as the plate c has been released from the stop e. it will be forced down by the spring` CZ until it resumes its normal horizontal position, where it can be reached by the key A. The lock can now again be opened in the ordinary manner by inserting the keyA and turning it backward. After the plate c has descended, as described, the slide e is pushed forward by its spring f, while the post 7L is turned by its spring h3. Thus the parts are in the proper position for a subsequent single or double turning of the key A.

The knob-spindle t' of the latch j passes through a slotted sliding plate k. Two wings z" on spindle t' bear against a flange 7c of plate 7c to reciprocate the same. The latch j rests in two notched bearings 7a2 of plate k, and is surrounded by a spring j', that forces the latch outward when the door has been slammed or closed by a push.

To the plate 7c is secnreda post. k3, to which is fastened one end of a spring m, the other end of which is secured to a fixed post m. This spring is distended when the latch is opened. As soon as the door-knob is released the spring will throw the plate k back and close the latch, a stop n engaging a notched 2. 'l`he combination of a bolt with a tilting 1o extension k" of plate k and insnringthepropei' plate c pivoted thereto, tnmblers g, secured rcctilineai` motion of the latter. to such plate, a slide e, adapted to engage the Vhat I claim splate, and a post h, having nose h', adapted 5 l. The combination of abolt with a tilting to engage the slide, substantially as specified.

plate c pivoted thereto, a slide c, adapted to MORRIS SIMON. engage Such plate, and a post 7L,l1avlng a \Vitnesses: nose that is adapted to engage the slidesnb- SAMMUEL RIVITZ,

stantially as specified. XV. COHEN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4593545 *Oct 28, 1983Jun 10, 1986P. A. Terry LimitedLever lock safety device
US6679087Oct 29, 2001Jan 20, 2004Rhino Metals, Inc.Safe lock mechanism
Cooperative ClassificationE05B63/0017