Double door assembly
OwnerLeonard E. Olberdinginventor
Life of this patent
Estimating the term…
Abstract
A novel way of keeping thieves out of dwellings and other spaces utilizes two interlocked, relatively nested doors which, when so interrelated, are in turn, separately locked as a unit within the door frame. Release from the exterior requires knowledge of a secret system of a push-button control which must be operated in proper sequence. Special, tamper-proof hinges, common to the doors, permit them to be hung in the door frame for separate swinging or movement as a unit. The interlock between the doors is releasable only from the inside and, upon such release, the outer door remains locked until separately released by the occupant.
Claims5
A safety door assembly for reducing the risk of injury or loss resulting from robbery, burglary or unauthorized entry, said assembly including:
- an open, upright framework having a pair of horizontally spaced stiles, a threshold between the stiles and an upper header between the stiles;
- an upright, inwardly-opening outer door complementally fitted within, entirely surrounded by said framework and provided with a continuous, inwardly-extending, peripheral band complementally fitted within and entirely surrounded by said framework, presenting an inwardly-facing cavity extending throughout its width and height;
- a number of vertically spaced hinges attached to one of said stiles and to the proximal vertical stretch of said band,
- said hinges supporting the outer door for horizontal swinging movement into and out of said framework;
- an upright, inwardly-opening inner door complementally nested within said cavity, entirely surrounded by said band and operably connected with said hinges along one vertical edge of the inner door,
- said hinges supporting the inner door for horizontal swinging movement relative to the outer door into and out of said cavity,
- said hinges having vertically aligned hinge pins common to said door and disposed adjacent the inner face of the inner door for horizontal swinging of the doors as a unit about the axes of said pins;
- and
- a solenoid within the other of said stiles having a core reciprocable horizontally toward and away from the outer door when the latter is within said framework,
- said band being provided with a core-receiving aperture.
Dependencies are inferred from the claim text.