Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Sash balances – Spring
Patent
1997-12-03
1999-10-05
Knight, Anthony
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Sash balances
Spring
292357, 292352, 16114R, B25G 100
Patent
active
059605170
DESCRIPTION:
BRIEF SUMMARY
This invention relates generally to the fixing in place of door furniture such as knobs and handles.
A common arrangement for mounting locksets and latchsets to doors entails a pair of mounting plates which abut the respective faces of the door and are fastened together through the intervening cavity which would typically also house the latch or lock assembly. The associated knobs or handles are each attached to a backing plate which is threadably engaged onto the mounting plate. A common arrangement is for the mounting plate to have an outstanding externally threaded spigot and for the rosette to have a central spigot with a matching internal thread. This traditional form of concealed fixing has aesthetic advantages over earlier one-piece fixing plates in which mounting screws are exposed but requires care on attachment to avoid the risk of thread damage. There is also a problem with the backing plate, and therefore the knob or handle, working loose in time. The latter problem has been approached by providing lug or friction configurations to oppose the loosening motion but these of course add to the complexity of the construction.
International patent publication WO92/12314 proposes an alternative configuration in which a backing plate, and mounting plate are interengaged in a bayonet fixing arrangement. This arrangement still involves a rotary attachment motion and remains susceptible to disengagement, especially bearing in mind that the knob or handle repeatedly functions with a rotary motion.
It is an object of the present invention to provide a novel fixing device for door furniture such as knobs or handles which is adaptable to a concealed fixing but eliminates the rotary action necessary in prior concealed fixing arrangements.
According to one aspect of the invention, there is provided a fixing device for door furniture comprising, plate assembly including slide means for sliding movement generally parallel to the door, when in situ, between a locking position and an attachment position, means to bias the slide means to the locking position, and an opening in the slide means to receive a fixing lug of an item of door furniture, said lug being configured for moving the slide means from the locking position to the attachment position on application of the lug to the opening, and for being thereafter locked into the mounting plate assembly on return of the slide means to its locking position whereby to attach the item of door furniture to the mounting plate assembly.
According to another aspect of the invention, there is provided a handle or knob assembly for a door comprising: plate assembly including slide means for sliding movement generally parallel to the door, when in situ, between a locking position and an attachment position, means to bias the slide means to the locking position, and complementary openings in an outer face of the mounting plate assembly and in the slide means; and complementary to said openings for receipt by the openings, locking position to the attachment position on application of the lugs to the openings, and for being thereafter locked into the mounting plate assembly on return of the slide means to its locking position to thereby attach the item of door furniture to the mounting plate assembly.
In an embodiment, the mounting plate assembly may comprise a pair of disc members defining a guideway in which the slide means is slidable. The slide means is preferably an elongate plate which extends generally transversely of the disc members, and the guide means is advantageously a matching slot for this plate in one of the disc members.
In another embodiment, the mounting plate assembly comprises a pair of plates spaced to slidably receive the slide means, which is then preferably a further plate. All three plates may be elongated.
The slide means preferably includes a portion exposed for engagement by a tool to move the slide means against the biasing means from the locking position to the attachment position, to permit detachment of the lugs and therefore the door furniture
REFERENCES:
patent: 5388307 (1995-02-01), Hyde
Gainsborough Hardware Industries Limited
Knight Anthony
Youmans Agatha
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