Closure fasteners – Bolts – Sliding
Patent
1996-01-11
1998-01-13
Lindsey, Rodney M.
Closure fasteners
Bolts
Sliding
292142, E05C 112
Patent
active
057070903
DESCRIPTION:
BRIEF SUMMARY
The invention relates to magnetic card-operated door closures.
The invention relates more particularly to magnetic code operated cylindrical type locks normally associated at present with circular operating knobs which must be rotated to release a door latch. Generally a laterally open slot is provided in the coded cylinder to receive a magnetic coded card and the cylinder can incorporate a magnetic lock code that can be automatically changed when required by insertion of suitable code changing cards. Such lock cylinders are fully described for example in European Patent 0241323 and European Patent Application 90903620-4.
Cylindrical type lock sets have operating knobs on the centre line of the lockset and on each side of the door which are capable of separately retracting the door latch when one or other is rotated. In the most common lock functions, the knob on the inside of a door can retract the door latch without using a coded key, irrespective of the lock being locked or unlocked. Such locks are in common use especially in hotels, homes and offices where the door is required normally to be unlocked from the inside without using a coded card or key even though it is locked from the outside. There is a preference in some territories for door latches and bolts to be retracted by handles instead of circular knobs. This preference has now become a requirement in some new government regulations because knobs are more difficult to rotate especially by children, the aged and physically handicapped persons. It has already been proposed where desired to have operating handle shafts laterally displaced from a locking bolt shafts and to surface-mount gear mechanisms connecting between the handle shafts and the bolt shafts in DE-A-3 627 634 and FR-A-2 682 985. "Surface-mounted gear mechanisms" are generally understood to mean a gear mechanism that lies generally flat and against a surface where it is held and has no shafts or axles which enter into the surface or extend much, if at all, beyond the lateral dimensions of the mechanism component gears themselves.
It is an object of the present invention to provide handle operated door closures incorporating magnetic card-operated cylindrical type lockset mechanisms which can be mounted in standard door holes used for most cylindrical type locksets.
According to the invention there is provided a handle operable door closure including a magnetic code lock cylinder for coupling to a spindle which must be rotated to retract a door latch, the spindle being arranged to extend into the door with its rotational axis generally at right angles to the major surfaces of the door, a face plate arranged to be fixed to one of the major surfaces and to support a handle having a handle shaft rotatable about an axis laterally displaced from and parallel to the axis of the spindle, a surface mounted gear mechanism for connecting and rotating the spindle and the handle shaft together, and a cam plate and a clutch plate to drivingly connect the gear mechanism to the shaft on insertion of a coded magnetic card in the lock cylinder.
The gear mechanism preferably provides a mechanical advantage such that the lock shafts turn through a greater arc than the handle shafts.
The gear mechanism may comprise a toothed rack extending between the axes of the lock shafts and the handle shafts arranged to cooperate with circular gears mounted respectively on the lock shaft and on the handle shaft.
Handle operated door closures according to the invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a partially cut-away side view of a door closure but not including a latch or dead bolt;
FIGS. 2A and 2B show respectively a front and side view of an outside trim plate assembly;
FIGS. 3A and 3B show respectively a front and side view of an inside trim plate assembly;
FIGS. 4A and 4B show respectively a top view of the door closure with a latch and a rear side view;
FIGS. 5A, 5B and 5C show different inside views of the inside trim plate assembly o
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