Locks – Special application – For closures
Patent
1997-12-24
2000-11-21
Dayoan, Bethann C.
Locks
Special application
For closures
70106, 70110, 70470, E05B 6506
Patent
active
061486507
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a bolt unit and frame arrangement. In particular it relates to a lockable bolt unit having a slidable bolt, typically for securing two movable panels together or for securing one movable panel to a fixed frame.
In this specification, "left" and "right" and similar geometric terms refer to parts in their condition of use as illustrated in FIG. 1, unless otherwise specified in relation to a drawing.
The following disclosure will refer to door panels, and for such applications the bolt may be resiliently biassed and with a chamfered end to permit a latching engagement. However, the bolt unit of the invention can be fitted to windows and other movable panels, and for these applications the bolt unit can have for example a non-chamfered bolt and be moved by an actuator to its engaged position.
BACKGROUND OF THE INVENTION
Both sliding and hinged doors need the facility to be made secure against unauthorised opening. Bolt units have therefore been developed which have fittings for attachment to an external surface of the door, specifically with the bolt being slidable in a bolt housing or casing between guides; in use the bolt unit includes a slidable bolt which can be moved into and out of engagement with a keeper secured to a fixed member, usually to the upright of a fixed outer door frame within which the door panel is hingedly mounted.
A door secured by a bolt unit is often vulnerable to unauthorised opening upon "bursting" of the securement, with the bolt being disengaged from its keeper. Such bursting of the bolt can for instance be effected by a blow impacting on the door edge perpendicular to the plane of the door, and which for a hinged door would be delivered in the door opening direction. A bolt is strong against bending and shear forces, but nevertheless if the bolt is mounted in cantilever the inserted (unsupported) and can often be sprung from its keeper by a determined blow.
It is of course desirable that unlawful opening movement of a door generally parallel to its plane (as might occur by use of a housebreaker's jemmy) also be made more difficult. Improved security against bursting movement perpendicular to the door frame should not result in reduced security against unauthorised opening parallel to the door frame; it is an advantage of embodiments of the invention that increased security can be provided against such attempted door openings parallel to its plane.
DISCLOSURE OF THE PRIOR ART
Bolts are widely used as fastening for hinged gates and include a bolt end which can slidably be moved into an aperture in a fixed upright, to prevent the gate swinging on its hinge.
More sophisticated bolt units have long been available in which the bolt is mounted in a housing, perphaps with the bolt fully concealed in the housing when in the retracted, inoperative condition, and with the housing carrying actuating means which can be used to move the bolt into a "holding" position with its one end projecting from the housing; with the housing mounted to a hinged door, if the projecting end of the bolt in this holding condition is fitted into an aperture (for instance in a fixed upright forming part of a frame for the door) then the door is held against swinging about the hinge(s).
The bolt unit will often have a key-controlled lock which can be operated to secure the bolt in its extended "holding" position.
For greater security, fabricated (metal) keepers secured to the upright are used instead of apertures cut in the upright.
Some bolt units have a latching action, in which the bolt is chamfered and biassed towards its holding position by a spring; when such a bolt engages its keeper as by the panel being closed, the chamfer causes the bolt to be retracted into its non-holding position until it enters the keeper aperture. Such latch action bolts can be fitted to the rim of a door and are then referred to as "rim latches"; they can also be secured in the holding position by a lock.
Rim latches are widely used to secure external doors in homes and office
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Barrett William A.
Dayoan Bethann C.
Home Doors Limited
Hultquist Steven J.
Vaterlaus Clifford B.
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