Lock with changeable warding positions
OwnerRodrick A. Herdmaninventor
Life of this patent
Estimating the term…
Abstract
A lock with changeable warding positions wherein a rotationally indexable warding member selectively enables one of a multiple of keys for operation of the lock.
Claims24
A lock, having at least one tumbler pin, wherein a first key, having an established configuration interoperable with said lock and enabling operation of said lock, and said first key having a key combination matching said lock, comprises:
- a) integral with said lock, a warding member comprising:
- I) at least one movable member having a configuration interoperable with the configuration of said first key to allow use of said first key to operate said lock;
- II) an indexing means interoperable with said movable member to enable multiple positioning thereof;
- III) said indexing means comprises at least one reset pin operating independently of said at least one tumbler pin;
- IV) said first key having a limited range of orientations wherein use with said lock is possible, whereby;
- b) said warding member is indexable to exclude the use of said first key to operate said lock, and;
- c) said lock is operable without interaction between said first key and said indexing means.
A cylinder lock comprising a lock cylinder, and a cylinder plug, having at least one tumbler pin disposed in conjunction therewith whereby at least a first key, having an established configuration interoperable with said lock, and a key combination matching said lock enables relative rotation between said lock cylinder and said cylinder plug wherein:
- a) integral with said lock, a warding member comprises:
- I) at least one movable member having a configuration interoperable with the configuration of said first key to allow use of said first key to operate said lock;
- II) an indexing means interoperable with said movable member to enable multiple positioning thereof;
- III) said indexing means comprises at least one reset pin operating independently of said at least one tumbler pin;
- IV) said first key having a plurality of orientations wherein use with said lock is possible, whereby,
- b) said warding member is indexable to exclude the use of said first key to operate said lock.
A lock cylinder plug, retrofittable to existing cylinder locks to create a cylinder lock assembly, wherein:
- a) said plug comprises:
- I) a warding member;
- II) said warding member is rotatably indexable from a first position to at least a second position;
- b) a reset key is used to index said warding member;
- c) a first passkey will operate said cylinder lock when indexed to said first position;
- d) at least one additional passkey will operate said cylinder lock when indexed to at least a second position.
A method of changing the key combination of a lock having at least one tumbler pin comprising the steps of:
- a) Providing a cylinder lock having a first passkey configured so as to operate said lock, at least one lockable rotatably indexable warding member, a reset key configured to enable rotation of said indexable warding member, co-acting therewith at least one reset pin operating independently of said at least one tumbler pin, and a second passkey, said reset key and said passkeys functioning independently of each other,
- b) Using said reset key to change the combination of said lock by rotating said warding member;
- c) Providing said second passkey with a warding cut positioned so as to co-act with said lock and said warding member so as to enable operation of said lock with said warding member in said second position whereas;
- d) Said first passkey is not able to operate said lock.
Dependencies are inferred from the claim text.