Keeper Device for Door Lock

In the past there have been numerous types of devices to guard against opening of a door by a thief. This invention is of such a device.

On many doors there are bolts which are operated by turning an operator on the lock inside the home or, from the outside, by a key. This invention is for use with such locks. It is composed of a keeper having a channel form member with a web extending from the channels and the web of which is folded back away from the channel flanges so that a hole through it is adapted to receive the lock bolt and wherein a block may be positioned between the flanges with an opening in it which will restrain rotation of the operator, which is usually elliptical, as shown in the drawings.

It is an object of this invention to provide a device to be installed on doors from the inside so that the lock cannot be opened without removal of the device and which is simple and inexpensive to install, is portable, and may be utilized on a wide variety of doors. A wide range of door sizes and lock devices may be accommodated by reason of the structure described.

In accordance with these and other objects which will become apparent hereinafter, the instant invention will now be described with reference to the accompanying drawings in which:

FIG. 1 is a perspective view of the instant invention installed on a door;

FIG. 3 is a view taken on the plane indicated by the line 2--2 and looking in the direction of the arrows;

FIG. 3 is a rear elevation view of a block forming a portion of te invention.

A door generally designated by the numeral 12, as is conventional, has an inside face 14 and an outside face 16 as well as a swingable side 18. From the side a lock bolt 20 is movable upon manipulating an operator 22 on the inside surface or a key on the outside surface, the latter not being shown. In other words, the bolt 20 can be advanced or withdrawn simply by turning the knob 22 on the inside. This device is of a unit which can be installed to prohibit that oblong or elliptical operator knob from being turned and hence the door from being unlocked from outside. The unit generally designated by the numeral 21 is composed of a channel form member having a web 22 and an upper flange and lower flange 24 and 26. The web is reversely bent as at 28 and provided with a cutout 30 that accommodates passage of the bolt. In use, once installed, as shown in FIG. 1, a block, as designated by the numeral 31, is inserted between the two flanges 24 and 26 with an opening 32 in it accommodating the operator 22, it can be seen that the operator cannot be turned because of the block acting in cooperation with the flanges. The block is preferably provided with magnets 36, 38, 40, 42 to hold it in position. It is thus seen that there is provided and disclosed a device which is simple and easily installed in the inside of a home or the like which will prohibit the lock from being opened from the outside.