Closure fasteners – Bolts – Hooked end
Reexamination Certificate
1999-05-19
2001-01-16
Browne, Lynne H. (Department: 3629)
Closure fasteners
Bolts
Hooked end
C292S114000, C292S006000, C292S056000
Reexamination Certificate
active
06174003
ABSTRACT:
DESCRIPTION OF THE INVENTION
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fastening assembly comprising a bolt and a keeper with which the bolt is engageable, for fastening doors or windows.
2. Description of Prior Art
Fastening assemblies each comprising a bolt and a keeper are well known for fastening doors or windows, and there are many different types of such fastening assembly. What such types have in common is a bolt carried by a Support means and movable relative thereto between an extended position in which the bolt is able to engage with the keeper and a retracted position in which it is not able to engage the keeper. Usually, support means for the bolt is mounted on an openable panel of the door or window and the keeper on the fixed frame relative to which the panel is openable. In its simplest form, the bolt is able to be directly manually, moved between its extended and retracted positions, but in more complex forms there are many different types of mechanism by which the bolt is movable. The bolt may form part of a lock, i.e. be movable between its extended and retracted positions by use directly or indirectly of a key.
A bolt for a pivotally openable window or door is usually provided at an edge of the window or door remote from the hinge or hinges by which the window or door is mounted relative to its fixed frame, the bolt being movable in a direction parallel or substantially parallel to the general plane of the window or door, to protrude beyond such edge of the window or door when it is in its extended position, thereby to be engageable with the keeper which is provided on or in the fixed frame. In some cases, however, it might be possible by application of force to effect relative movement between the window or door and fixed frame in the direction of retraction of the bolt, thereby to disengage the bolt from the keeper and permit the window or door to be opened without extraction of the bolt. There are fastening assemblies which aim to defeat the opening of a fastened window or door in this manner, but with the drawback of greater complexity, e.g. by requiring a bolt mounted to its support means in a manner enabling it to be moved in an arcuate path of movement.
Various forms of fastening assembly offering improved security are disclosed for example in the following references:
GB-2134960 discloses a locking device with a latch bolt engageable by a retaining element, in order to prevent the bolt from being forced back from its locking position. GB-1505455 discloses a sliding bolt fastening device for a vehicle panel or tailboard, with a toggle mechanism arranged to provide a self-tightening effect. GB-1422321 discloses a bolt which is lockable against axial releasing movement from its keep, by means of a plug which extends into the bolt and operates a detent mechanism. GB-1046541 discloses a lock whose bolt also includes an axial slider. After the bolt head has passed through a slot in the striker, the slider enters the slot to prevent withdrawal of the bolt from the slot. U.S. Pat. No. 4,512,597 discloses a lock whose bolt has auxiliary locking elements movable outwardly by a central plunger. U.S. Pat. No. 4,312,527 discloses a locking mechanism which utilises spaced plates with T-shaped tongues, between which bolt members are movable.
SUMMARY OF THE INVENTION
It is broadly the object of the present invention to provide a fastening assembly which provides enhanced security, but with such drawbacks reduced or minimized.
According to the invention I provide a fastening assembly, comprising a bolt; a support means for the bolt, the bolt being movable relative to the support means between an extended position and a retracted position; and a keeper means with which the bolt is engageable when in its extended position, wherein the keeper means comprises a keeper element and the bolt affords a formation able to receive and retain the keeper element, the bolt comprising portions moveable relative to one another to permit the keeper element to enter said formation as the bolt is moved from its retracted to its extended position, and there being means for preventing relative movement between said portions when the bolt is in its extended position, whereby the keeper element is held retained in said formation.
In a fastening assembly according to the invention, the entry of the keeper element into the formation afforded by the bolt as the latter is moved from its retracted position to its extended position, and then the retention of the keeper element in the formation in the bolt when the bolt is in its extended position has the result that the bolt cannot be disengaged from the keeper means by moving the bolt and its support means relative to the keeper means, unless the bolt has been moved from its extended position. Preferably said formation afforded by the bolt comprises an aperture extending transversely of the bolt. In this case, the keeper element preferably comprises an element extending transversely of the keeper means, for reception in said aperture.
The keeper means may comprise a plate having an aperture for receiving the bolt, the plate being adapted to be fixed to a door or window frame to lie in a plane perpendicular to the direction in which the bolt moves between its extended and retracted positions to enter and withdraw from the aperture, and the keeper element may then be spaced rearwardly of the plate. The keeper element preferably is in the form of a peg or pin.
The bolt conveniently comprises two jaw portions together defining said formation for receiving the keeper element, said jaw portions being movable away from one another to permit the keeper element to enter the formation, and preferably being spring-biased towards one another.
Preferably the jaw portions have cam surfaces which, by engagement with the keeper element, urge the jaw portions of the bolt apart to permit the keeper element to enter or leave the formation, as the case may be, in the course of movement of the bolt between its retracted and extended positions.
The jaw portions may have formations which co-operate with abutment formations provided on the support means for the bolt as the latter approaches its extended position, to prevent the jaw portions being moved apart.
The jaw portions of the bolt may respectively be pivotally mounted to a bolt member which carries them.
The bolt preferably is part of a lock which includes a key-operable mechanism for moving the bolt between its extended and retracted positions.
REFERENCES:
patent: 983647 (1911-02-01), Romines
patent: 2783071 (1957-02-01), Williams
patent: 3360290 (1967-12-01), De Gray
patent: 3515421 (1970-06-01), Poe et al.
patent: 4312527 (1982-01-01), Tannery
patent: 4482175 (1984-11-01), Sugie
patent: 4512597 (1985-04-01), Nabb et al.
patent: 5544924 (1996-08-01), Paster
patent: 1046541 (1966-10-01), None
patent: 1 422 321 (1976-01-01), None
patent: 1 505 455 (1978-03-01), None
patent: 2 134 960 (1984-08-01), None
patent: 2275500 (1994-08-01), None
Browne Lynne H.
Kirschstein et al.
Walsh John B.
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