US 5,313,812 AGranted

Door lock security system

OwnerSigurd T. Eklund, Rainer A. Eklundinventors

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Abstract

A door security system is used in conjunction with a lock such as a deadbolt lock having an "inside" located actuating handle, of the type used in hotel rooms, having a major and a minor dimensional axis. The security device has a baseplate that fits beneath the faceplate of the lock and which can be oriented during installation in relation to the shaped actuating handle of the lock. The baseplate of the security device extends eccentrically off center and supports a pivot post that carries a latch locking plate. The locking plate is pivotally supported on the pivot post, for pivotal rotation thereabout, and has an arcuate passage off-set from the pivot post, in use to receive the lock actuating handle. In use, with the baseplate installed beneath the faceplate of the lock and the lock handle rotated to extend the bolt, the locking plate may be rotated about the pivot post, swinging the arcuate passage over the lock handle in immobilizing relation therewith. In this condition the shaped lock handle cannot be rotated, and the lock is restrained in a locked condition despite the use of a proper key, externally.

Claims8

Dependent claims

In combination, a door lock having a removable, inside faceplate, an interior rotatable lock spindle extending through the faceplate, and a lock handle extending from the spindle, being shaped, non-circular section having a major lateral dimension and a minor lateral dimension, said handle being rotated on actuation of the lock, from a first unlocked position to a second, locked position;

a lock handle immobilizing device for installation with said lock, said immobilizing device having a baseplate, the baseplate having a substantially planar first portion for installation in secured relation beneath said lock faceplate, said base plate having an aperture therein for passage of said spindle therethrough, a second portion of said baseplate extending outside said lock faceplate, said baseplate being selectively rotatably positionable beneath said lock faceplate to orient said second portion in predetermined angular relation from said lock handle;
said baseplate second portion having pivot means thereon;
and
a locking plate pivotally mounted thereto for pivotable displacement of said locking plate substantially parallel with said faceplate, said locking plate having a locking passage therein, for arcuate displacement of said locking passage over at least a portion of said lock handle in containing, immobilizing relation therewith, whereby, in use, with said baseplate selectively pre-positioned relative to said lock handle when in said locked position and non-rotatably secured by said faceplate, and with said handle in said second, locked position, said locking plate may be pivotally rotated about said pivot means to displace said locking passage in aligned relation over at least a portion of said lock handle, to immobilize said handle against rotation thereof.

1 more element

Dependencies are inferred from the claim text.