US802499A - Two-latch lock with safety-catch. - Google Patents

Description

PATENTED OCT. 24, 1905.

W. DTGKEL. TWO LATCH LOCK WITH SATETT GATGH.

AFPLIOATION YILBD APR: S.

TWOMILTCH LOCK lNlTi-l SAFE'l'Ym-CATCl-l.

Specification of Letters Patent.

atented Oct. 24, 1905.

Application filed April 3, 1905. Serial No. 253,660.

.To all wlmi/1t t nt/,ty/ concern:

Beit known that I, WILHELM DIoknL, a subject of the German Emperor, and a resident of Berlin, Germany, have invented certain new and useful Improvements in Two-Latch Locks with Safety-Catch by Means of the Latch, of which the following is a specification.

The lock most in use for the doors of rooms and halls is the two-latch lock with a springbolt. In order to prevent that such a door could be opened from the other side, special devices werehitherto required,such as anightbolt, a second lock, and the like. According to the present invention the lock is secured against being' opened by turning the latch in the direction the opposite of that in which it is opened, so that the opening of hall-doors by means of false keys can be easily prevented and without any special devices. To this end the roll-back of the lock is divided perpendicularly to the axis of rotation, so that .each latch has a roll-hack for itself, and the roll-back on the latch being turned in the opposite direction fixes or secures the bolt of the lock.

The accompanying drawings show a form of construction of thelock with alatch on both sides.

Figure 1 shows the case of the lock 17 open. Fig. 2 shows the same in a section on the line mf fn, of Fig. l with the lower part omitted.

Similar numerals refer to similar parts throughout both views.

In the twolatch locks with a spring-bolt hitherto in use the latch could be turned only in one directiondfor instance the latch 6 of Fig. 1 downward, whereby its thumb 2 gets into the position indicated by a dotted line and thereby pushes back the bolt 7 of the lock, and thus lopens the door. lf now, as done in this invention, the latch 6 is turned upward into the position 5, its thumb 2 gets into the position 1 and sets against a projection 18 of the bolt, so that the latter cannot be moved from the other side of the door. The super-posed parts andaof the roll-hack have, as shown in Fig. 2, a mutual inner guide. They are held together at their contact-surface by a ring 12, which might, however, also be fastened to one of the roll-backs.

In order to fasten the pin 8 or 9 of the latch 6 or 5 in its roll- back 3 or 11, it is split longitudinally, and the end of it is excavated, as shown in Fig. 2. This cavity tapers toward the interior, while the hole of the rollv back tapers toward the outside. 1n the cavity is a split piece 10 or 11 on a pin 18 or 19, which pin passes through the latch 6 or 5 and is threaded at the end. lf the roll-back 20 is drawn tight, the parts of the pin 8 or 9 cleave or fork asunder and the latch 6 or 5 is firmly secured in its roll-back 3 or et.

It is immaterial whether both door-latches are fixed or are in the form of keys or whether a fixed latch and a key are used.

F or hall-doors only a fixed latch is used, as a rule, while the door is opened from the outside by means of a key. Such a door is safely locked from the inside in the above-described manner. If the door is also to be secured from the outside, a second lock 22,with key 23, is used, the bolt 21 of which secures the bolt 7. 1n order to be able after releas ing the safety device to open the door with the same key .Q3-that is to say, to push back the bolt (#there is either provided on the holt 'T a projection matchingthe key 23, or, as shown in Fig. 1, a lever 24C is used. 1f now the key Q3 is turned in the opposite direction, it turns the lever 24:, and the latter pushes back the bolt 7 by means of the projection 1a.

In order to su pport the latch 6 or 5 in its horizontal position, a springy projection 15 has been provided, against which sets the thumb 16 of the roll-hack 3.

If the door is to be secured on one side only, a projection 25 is provided, which prevents the roll-back from being' turned in the opposite direction and into the position 1.

Vhat l claim as my invention, and desire to secure by United States Letters Patent, is-

l. 1n a two-latch lock with a spring-bolt and a roll-back the division of this roll-back vertical to its axis, and the device by which, in consequence of turning the latch in the opposite direction (direction of the arrow,) the bolt of the lock is secured in its closing position, so that the door is at once protected against being opened from the outside, substantially as set forth.

2. In a two-latch lock with a spring-bolt and a roll-back the arrangement that the pin of the latch (8 or 9) is split and that there is pressed into its wedge-like excavated end a splitting-piece (10 or 11,) which is placed on a pin 18 or 19 extending through the latch and which is drawn 'tight from the outside, substantially as set forth.

3. In a two-latch lock with a spring-bolt and a roll-back the arrangement of a second lock 22 serving to bolt the lock of the door, and the key 23 of which, if turned in the opposite IOO IIO

direction, also opens it, substantially as set In Witness whereof l have hereunto signed foi-th. my name, this 15th day of March, 1905, in 4. In etWo-latoh lockwith aspring-loolt and the presence of two subscribing Witnesses. a rollback a projection 25 which prevents one VVILHELNI DICKEL. 5 part of the roll-back from being turned into VitneSses:

the locking position l, substantially as and for HENRY HASPER,

the purpose set forth. WOLDEMAR HAUPT.

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