US1804277A - Safety lock for doors - Google Patents

Description

y 1931. M. F. RUIZ SAFETY LOCK FOR DOORS Filed March 20, 1930 Patented May 5, 1931 ETED STATES MARIO F. RUIZ, OF GUANABAGOA, CUBA.

SAFETY LOCK FOR DOORS Application filed March 20, 1930. Serial No. 437,440.

This invention relates to looks and has for an object the provision of an improved construction which prevents a burglar or other unauthorized person from forcing the bolt back after it has been projected into its keeper.

Another object is to provide a sliding plate acted on by levers by the motion of the bolt itself when the door is closed and that will shield the bolt from being shoved back into its casing by any one pushing upon the inclined surface of the bolt.

In the accompanying drawings Figure 1 is a front view of the lock.

Figure 2 is a side section of the lock through line 2-2 of Figure 1, when the door is closed, showing position of levers and shield plate.

Figure 3 is a front section of lock through line 33 of Figure 1 when the door is closed showing front view of keeper or shield casing.

Figure 4 is a side section of the look through line 22 of Figure 1 at the moment the bolt is drawn into its casing to open the door, showin position of the levers and shield plate.

Figure 5 is a perspective view of the lever in the bolt case.

Figures 6 and 7 are different views of the lever in the keeper or shield case.

Figure 8 is a perspective view of the shield plate.

Referring to the accompanying drawing, number 1 shows the bolt case of the lock on the door 3 and 2 is the keeper or shield case on the jamb of the door 4: both held in place by means of screws, casing 1 containing any suitable mechanism for operating the bolt 8, a handle being used for drawing the bolt from the inside while a suitable key may be provided for withdrawing the bolt from the outside and not shown as it forms no part of the present invention.

The bolt 8 has a beveled or inclined face as is usual with bolts of this kind and is acted on by means of the usual spring that will allow the bolt to be forced back into its case as the door is slammed. The permanent position of the bolt is that shown in Figure 2.

The operation of the lock is as follows: considering the normal position of the bolt 8 as shown in Figure 2 with the door closed. We have the bolt acting on two levers 9 pivoted at 7 on'the side wall of bolt casing and 20 pivoted at 19 on the side wall of keeper or shield casing. As can readily be seen in Figure 2, the bolt 8 is in normal position when the door is closed. As the bolt is drawn back into its case to open the door it will disengage the end of the lever 20 in shield casing which is held in place by the bolt and by means of lever 9 in the bolt casing one of whose end slides inside groove 10 in the bolt, its other end will then move forward as the bolt is drawn backwards, thus causing the metal plate or shield 15 to slide back into its casing and the door is free to open.

Then again as the door is being closed the bolt pushing forward into the keeper or shield case will act upon one end of lever 20 on the keeper or shield case, causing the other end of the lever 20 working in a slot in the shield or metal plate 15 to slide out of its casing toward the bolt casing at the same time that the reciprocate motion imparted by the motion of the bolt to lever 9 in bolt casing allows free motion to said plate and thus establishing a protection for the bolt from being tampered with from the outside by any instrument or contrivance placed ber tween the door and the jamb and pushing against the beveled face of the bolt.

What I claim is:

1. In a lock of the character described, the combination with a locking mechanism including a bolt having a beveled face and in its stem a cam groove, of a lever pivoted in the bolt casing and engaging at one end the cam groove of the bolt, a metal plate or shield slidable in the keeper, and a lever pivoted in the keeper and connected to the shield, so that the bolt in its forward movement engages the second lever which causes the plate or shield to slide out of the keeper into the bolt casing, thus protecting the bolt from any object placed between the door and door j amb from the outside.

2. In a lock of the character described, the combination with a locking mechanism including a bolt having a beveled face and in its stem a cam groove, of a lever pivotally mounted in the bolt casing and engaging at one end the cam groove of the bolt stem, a metal shield slidably mounted in the keeper, a lever pivotally mounted in the keeper and in line with the opening between the keeper and the locking mechanism, one of the arms of the second lever engaging an opening in the shield, so that the bolt in its forward movement will engage the free end ofthe second lever, causing the shield to slide out of the keeper into the bolt casing, thus protecting the bolt from any object placed between the door and door jamb from the outside, and in the backward movement of the bolt the free end of the first lever will push the shield into the keeper.

3. In a lock of the character described, the combination with a locking mechanism including a bolt having a beveled face and in its stem a cam groove, of a lever pivotally mounted in the bolt casing and having one of its arms engaging the cam groove of the bolt stem, a metal shield slidably mounted in a hollow of the keeper, a lever pivotally mounted in the keeper and having one of its arms engaging an opening in the shield and having its other arm in line with the opening between the keeper and the locking in its forward movement will engage the aligned arm of the second lever causing the shield to slide out of the keeper into the bolt casing, thus protecting the bolt from any object placed between the door and door jamb from the outside, and in the backward movement of the bolt the free end of the first lever will push the shield into the keeper.

In Witness whereof I flfl'lX my signature.

MARIO F. RUIZ.

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