US1142591A - Automatically-locking lock. - Google Patents

Description

A. LEISTLER.

AUTOMATICALLY LOCKING LOCK.

APPLICATION FILED MAR. 9, I9I4.

Patented June 8, 1915.

10 Fig.1.;

THE NORRIS PETERS CO., FHOTC-LITHQ. WASHINGTON, D. C.

" :ALOIS LEISTLEB, or HoLLENs rEIN, Yeas; AUSTBIA-HUNGARY.

AUTOMATICALLY-LOCKING Look. I

A primary object of this invention is to provide an improved automatically locking lock for drawers, doors and the like of that held in its unlocked position, is released tvpe in which the bolt, which is normally directly or indirectly by means of a blow on an auxiliary member from the latter. In locks of this type as atpresent knownthe auxiliary member projects from the case of the lock and this has thedisadvantage that when the drawer or door is open, the bolt may be released by accidental contact with the auxiliary member, so that the bolt must be pushed back by means of the key before thedrawer or door can be shut. In the improved lock, forming the subject matter of my invention I obviate this defect by arranging the auxiliary member completely inside the lock-case and providing the latter with an aperture through which a stop, provided on the guide of the drawer or on the frame of the door, enters when the drawer or door is closed and actuates the auxiliary member. This advantage is of importance particularly for looks on drawers, because when manipulating with the contents of the drawer it may readily happen that owing to a portion of the contents striking the auxiliary member the bolt is released.

Several embodiments of my lnvention are represented by way of example in the accompanying drawings, wherein:

Figure 1 is a front elevation of a lock particularly intended for drawers, the coverplate having been removed and the lock being shown in its unlocked position; the auxiliary member is located inside the case of the lock and itself holds the bolt in its unlocked position; Fig. 2 is a cross section taken on the line A.A in Fig. 1, and Figs. 3 and 1 are like views, respectively, of the lock in its locked position; Fig. 5 is a view corresponding to Fig. 1, showing a lock differing from that shown in this figure in that the auxiliary member acts on tumblers; Fig. 6 is a horizontal section taken on the line BB in Fig. 5, and Fig. 7 is a like Specification of Letters Patent.

, comprises a ,mally pressed Patented June 8 1915.

Application filedll/Iarch 9, 1914. Serial No. 823,612.

section of the lock in its locked position; Fig. -8 shows a preferred form of the stop; andFig. 9. isa horizontal section showing the lock represented in Figs. '1 to 5 .when employed on a door.

Referring firstly to Figs. 1 to 4, this look bolt 1 which can be moved by means of a'key and has a one-step movement. The bolt lies flat on the rear wall 2 of the caseof the lock and when moved is guided by a pin 4 projecting through a slot 3. "In the locked position the bolt is held by tumblers 5, while it is held in its unlocked position by the auxiliarymember 10. The tumblers which are rotatable about thepivot 6 and have a T-shaped recess 7, are held pressed by springs 8 against the stop pin 9 of the bolt. The releasing member or lever 10, disposed adjacent to and parallel with the bolt, ismounted to rock about a pivot 11, mounted on the rear wall 2 and is noragainst this wall by a spring 12. This lever 10 isformed as a hook which in the unlocked position of the bolt 1 takes overa lateral projection 1 of the same and thus holds the bolt in this position (Figs. 1 and 2). In proximity to the upper end of the lever 10 the wall 2 is provided in a novel manner with an aperture 13 through which a stop 14, provided on the bottom of the guide of the drawer, can project and coact with the lever 10 when the drawer is being closed.- The stop consists of a hook bent rectangularly' preferably stamped out of the materirl of-the sheet-metal plate 15.

When the drawer is being closed the stop 14 projects through the aperture 13 into the case of the lockand forces the lever 10 back against the action of the spring 12, whereby the bolt is released and can fly forward under the action of its spring'16 into the locked position represented in Figs. 3 and 4, in which position it is held by the tumblers 5. On the lock beingunlocked and the drawer pulled forward the lever 10, held in its tilted position by the stop 14, is removed from the stop and returned into its normal position, tracted bolt with its hook.

In the embodiment shown in Figs. 5 to 7 the bolt 1 is held by tumblers both in its unlocked and in its locked position; the lowest' or rearmost tumbler 5" (Fig. 5) of the three tumblers holds the bolt in its unlocked position, while the two upper or front tumblers 5 and 5' hold it in its locked position.

In order that the tumbler 55 holding the bolt in its unlocked position, may be released by means of the lever 10, the latter is provided not with a hook, but with a beveled lug 17 which coacts with a projection 18 of the tumbler 5".

When the drawer is being closed and the lever 10 is forced back by the stop 14, the tumbler 5" is rocked by the slanting face 1'? of the lever 10 and removed from the pin 9 so that the bolt is released and can fly forward "into its locked position. On the drawer bein unlocked and pulled out the lever 10 returns to its normal position, in which it releases the tumbler 5 so that the latter can move forward into its locking position and hold the retracted bolt 1.

Obviously, instead of the spring-pressed lever 10 a spring may be provided, it being formed with a hook in theflock shown in Figs. 1 to 4, and provided with a lateral slanting face 17 for coacting with the tum bler 5 in the lock according to Figs. 5 to 7 With reference to the stop 14, thesame is preferably movable so that'it does not hinder a filled drawer being opened. For this purpose the stop 14 shown in Fig. 8 is mounted to rock between two lugs 15 of the plate 15 in such a manner that it is prevented by this plate from rocking backward out of its operative position, whereas it can rock freely in the other direction. A spring 20 tends to hold the stop in its operative position. Should thedrawer be pulled forward and the contentsthereof strike against the hook, the latter will be rocked and can enter through an aperture 21 in the plate 15 into the recess22 in the guide of the drawer. On the drawer being closed or after the pressure exerted on the stop 14 is removed, the latter springs back into its operative position.

The above described lock can also be employed for doors, particularly for the doors or lids of boxes. For this purpose the lock is mounted in such manner in the inner side of the door 24 (Fig. 9) that the aperture 13 in the wall 2 of the lock is located opposite the stop 14 mounted on the frame 25 of the door so that-on the door being closed, the stop can enter into the case of the lock and coact with the lever 10. In this embodiment the stop .14 on the plate 15 for receiving the bolt 1 is a pin, and the aperture 13 in the wall 2 extends into the plate 26, in order to enable the pin to enter into the case of the lock. As the auxiliarymember does not project through the case of the lock in the above described locks accidental contact with the same and consequent release of the bolt is tion a casing, a key-operated locking-bolt, a

spring tending to hold said locking-bolt in its locking position, tumblers coiiperating with said locking bolt,,an auxiliary member arranged within the casing and adapted to retain the bolt in its unlocked position, said casing being provided with an aperture, and a trip adapted to enter said aperture upon closing to cause said member to release said bolt from its unlocked position.

:2. A safety-lock comprising in combination a casing, a key-operated locking-bolt, a spring tending to hold said bolt in its locking position, tumblers holding the lockingbolt in its unlocked position, an auxiliary member arranged within the casing, said casing being provided with an aperture, a trip adapted to enter said aperture upon closing to move said auxiliary member, and a slanting face on the auxiliary member adapted on movementof the latter to release said tumblers.

3. An automatically locking lock for drawers, doors, or the'like, comprising a casing, a locking-bolt, means within said casing to maintain said bolt in its retracted position, said casing having an aperture therein in proximity to said means, and a trippingdevice for causing said means to release said bolt, when said drawer is closed, comprising a pivoted arm adapted to enter the aperture of the casing of said lock to disengage said means from said bolt, a pocket in the casing of said drawer in which said arm is pivoted and into which the arm may swing when not in the aperture of the casing of the lock, and means for yieldingly maintaining the free end of said arm in its operative position outside said pocket.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALO'IS LEISTLER.

Witnesses:

ALBIN SCHILLER, Auous'r FUGGER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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