Closure fasteners – Bolts – Multiple
Patent
1997-08-07
1999-09-14
Meyers, Steven
Closure fasteners
Bolts
Multiple
292 29, 292 51, 292112, 292DIG72, 292DIG46, E05C 106
Patent
active
059510684
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Investigation
This invention relates to improvements in locks and more particularly to a lock suitable for the locking of a sliding closure such as a sliding door.
2. Background Information
Locks commonly used for latching-closed a sliding closure such as a sliding door have a lock beak which hooks into an opening in a latch plate or strike. Forced entry through the door is possible since the door usually can be lifted sufficiently to release the beak from the strike. To try and overcome this possibility, it is known to have a pair of locking beaks which lock in opposite directions and thereby resist any forced entry caused by lifting the door. However, it is still possible to apply force to the door in such a manner as to drive the beaks out of the locking position and thereby permit the door to be opened.
A problem which can also arise with locks for sliding doors is that the locking beak can be located in the locking position when the door is not in the fully closed and therefore lockable position. Thus, if the door is slammed shut with the beaks already in the locking position, damage to the beaks and/or lock mechanism can occur. Furthermore, damage to the strike can possibly also take place as the extended beak hits the strike.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a lock for locking a sliding door, the lock being more resistant to forced entry than previously known locks of this type.
According to one broad aspect of the invention there is provided a lock including a pair of hook shaped locking elements mounted for counter-rotation, means for controlled movement of the locking elements from a first position where the locking elements are substantially retracted in the housing and a second position where the locking elements can latchingly engage with a strike, the moving means including a handle accessible externally of the housing.
In the preferred form of the invention the moving means includes a gear wheel drivingly engaged with a pair of rack members, each rack member being drivingly coupled with a said locking element. According to the preferred form, each locking element is pivotally mounted relative to the housing and a drive element of one of the locking elements or the rack member is engaged with a follower of the rack member or the locking element as the case may be.
A further object of the present invention is to provide a lock for the locking of a sliding closure, the lock having an anti-slam protection mechanism which prevents the lock mechanism from being operated except when the closure is in a closed position.
According to a second broad aspect of the invention, there is provided a lock including a pair of hook-shaped locking elements mounted for counter-rotation, means for controlled movement of the locking elements from a first position where the locking elements are substantially retracted in the housing and a second position where the locking elements can latchingly engage with a strike, the moving means including a handle accessible externally of the housing, there being a means for preventing movement of the locking elements unless the lock housing is at a predetermined disposition to the strike.
In the preferred form, the prevention means includes a latching element which engages with the moving means to prevent actuation thereof, there being an actuator which as the lock housing approaches the strike causes the latching element to release the moving means.
In a preferred form of the invention at least one rack member is provided with a coupling means for coupling the rack member to a connecting rod from a shoot bolt.
The invention also can include a shoot bolt strike which comprises a mounting base and a shoot bolt strike plate adjustably mounted with the base.
In a preferred form of the invention the strike plate is movable relative to the mounting base against biasing means.
The connecting rod in one preferred form slidingly engages in a bore extending longitudinally through one leg of
REFERENCES:
patent: 1038624 (1912-01-01), Messick
patent: 1070365 (1913-08-01), Voight
patent: 1667600 (1928-04-01), Martinek
patent: 2253495 (1941-08-01), Cordrey et al.
patent: 2540686 (1951-02-01), Milburn
patent: 3899201 (1975-08-01), Paioletti
patent: 3904229 (1975-09-01), Waldo
patent: 4643005 (1987-02-01), Logas
patent: 5526659 (1996-06-01), Takimoto
Allum David Nicholas
Strong Nathan Paul
Interlock Group Limited
Meyers Steven
Walsh John B.
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