Back to results
US 5,704,664 AGranted
Door security device
OwnerBranko Naumovskiinventor
Life of this patent
Estimating the term…
Abstract
The device is used for security by e.g the occupier of a hotel room. A toggle-type self-gripping mechanism is provided with thin jaw-blades. The blades are entered into the slot or gap between a door and a door jamb. The jaws engage the door-bolt, and the device enables a heavy gripping clamp to be applied to the bolt. The thin jaws do not buckle under the heavy clamping because they are constrained against buckling by the slot. A screw-clamp may be substituted for the toggle-clamp.
Claims10
A door bolt security device including;
- two jaw-levers and a main pivot;
- the main pivot defining a main pivot axis, the structure of which enables the jaw-levers to undergo relative pivoting movement,
- the jaw-levers being mutually co-planar and lying in a plane perpendicular to the axis of the main pivot,
- the jaw-levers including jaw-blades which are of thin sheet metal,
- the jaw-blades including jaws that are disposed towards one end of the respective jaw-levers, wherein the jaws are structured for gripping a door bolt between the jaws when the door is closed;
- the device also including a handle means for receiving a force derived from the hand of a person operating the device so as to transform that hand force into a gripping force acting between the jaws so as to grip a door-bolt between the jaws, and
- an operable force-locking means including a screw and a nut which in use act on the jaw-levers for retaining the gripping force up to a magnitude F, after the person has released the handle means,
- the screw having a slit along its length, the slit receiving the sheet metal of the jaw-blades therein with a tight fit to prevent buckling of the jaw-blades,
- the screw and nut being mounted on the device so as to ensure that the gripping force arising from the screw and nut is applied to the jaw-levers in the plane of the sheet metal of the jaw-blades, in that the line of action of the gripping force lies within the thickness of the sheet metal of the jaw-blades, and wherein the jaw-blades are so thin that the magnitude F of the gripping force is sufficient to cause the thin sheet metal of the jaw-blades, if not constrained, to buckle.
6 more elements
A door-bolt security device, in which:
- the device includes jaws, comprising jaw-blades, which are of hard, thin, sheet metal;
- the sheet-metal jaw-blades are flat, co-planar, and are thin enough, so as to be adapted to fit into the kind of gap or slot that is typical between a closed door and a corresponding door-jamb;
- the sheet metal jaw-blades are so shaped and adapted as to be suitable for operative gripping engagement with the bolt of a door;
- the device includes jaw-levers, on which the jaw-blades are respectively disposed;
- the jaws are disposed towards one end of the respective jaw-levers;
- the device includes a main pivot, having a main pivot axis, the structure of which enables the jaw-levers to undergo relative pivoting movement;
- the two jaw-blades are mutually co-planar, and lie in a plane perpendicular to the axis of the main pivot;
- the device includes a handle means for receiving a force derived from the hand of a person operating the device, and for transforming that hand force into a force for pressing the jaw-blades together onto the door-bolt with sufficient force that the jaws grip the door-bolt forcefully enough to hold the bolt against unauthorized movement of the door-bolt;
- the device includes a clamping means for holding and retaining the jaw-blades gripped to the door-bolt with the said sufficient force, even when the handle means is released, and wherein the means for holding and retaining the jaw-blades gripped to the door-bolt comprises a screw and nut;
- the screw and nut also comprise a jaw-blades support means for preventing buckling of the jaw-blades in that,
- the screw is formed with a slit along its length, and the slit overlies the sheet metal of the jaw-blades, the slit screw having a tight fit over the sheet metal so as to prevent buckling of the jaw-blades, and
- the screw and nut being mounted on the device so as to ensure that the force arising from the screw and nut is applied to the jaw-blades in the plane of the sheet metal of the jaw-blades, in that the line of action of the said clamp force lies within the thickness of the sheet metal of the jaw-blades.
9 more elements
Dependencies are inferred from the claim text.