Claims
- 1. A magnetic key operated lock comprising a lock plate, a generally planar slide member which is movable relative to the lock plate between a locked position and an unlocking position with a magnetically coded key, and magnet pins carried by the slide member;
- the pins being distributed across and slidable transversely to a principal plane defined through the generally planar slide member, the pins being slidable from a first position in which the pins engage the lock plate to lock the slide member in the locked position to a second position in which the pins are disengaged from the lock plate to allow the slide member to be moved to the unlocking position, the position and polarity of the pins forming a magnetic code for the lock;
- wherein a code changing means is provided for changing the code of the lock from a first predetermined magnetic code to a second predetermined magnetic code by moving at least one magnet pin from a first location to a second location in the principal plane of the slide member;
- the code changing means comprising a rotatably mounted carrier in the slide member that rotates about an axis that extends generally transverse to the principal plane and a magnet pin slidable transversely in the carrier, which pin is arranged to engage an abutment formed in the lock plate as the slide member is moved with a code-changing key, thereby causing, while the magnet pin in the carrier is abutted against the abutment, the carrier to rotate during movement of the slide member.
- 2. A lock as claimed in claim 1, wherein at least two rotatable carriers are provided, said carriers being meshed together and each carrying at least one magnet pin.
- 3. The lock as defined in claim 1 further comprising a key with a body carrying predetermined magnetic codes arranged with one code for unlocking the lock, one code for changing the lock code from one lock code to another lock code, and one code for continuing to unlock the lock after the lock code has been changed to the other lock code.
- 4. A magnetic key operated lock comprising a lock plate, a generally planar slide member which is movable relative to the lock plate between a locked position and an unlocking position with a magnetically coded key, and magnet pins carried by the slide member;
- the pins being distributed across and slidable transversely to a principal plane defined through the generally planar slide member, the pins being slidable from a first position in which the pins engage the lock plate to lock the slide member in the locked position to a second position in which the pins are disengaged from the lock plate to allow the slide member to be moved to the unlocking position, the position and polarity of the pins forming a magnetic code for the lock;
- wherein a code changing means is provided for changing the code of the lock from a first predetermined magnetic code to a second predetermined magnetic code by moving at least one magnet pin from a first location to a second location in the principal plane of the slide member;
- the code changing means comprising a rotatably mounted carrier in the slide member that rotates about an axis that extends generally transverse to the principal plane and a magnet pin slidable transversely in the carrier, which pin is arranged to engage an abutment formed in the lock plate as the slide member is moved with a code-changing key, thereby causing, while the magnet pin in the carrier is abutted against the abutment, the carrier to rotate during movement of the slide member;
- wherein at least two rotatable carriers are provided, said carriers being meshed together and each carrying at least one magnet pin; and,
- wherein at least two of said carriers are of different size and arranged to be rotated together automatically through different predetermined angles to change a code of the lock when a key having a code changing code is inserted in the lock.
- 5. A lock as claimed in claim 4, wherein at least one carrier is rotated more than one complete rotation before the code of the lock is repeated.
- 6. A lock as claimed in claim 4, wherein a respective abutment is associated with at least two carriers, such that when the lock is in a first code a pin in a first carrier engages its respective abutment when the lock is operated by a first code changing key to change the code to a second code, and when the lock is in the second code, a pin in the second carrier engages its respective abutment on an operation of the lock by a second code-changing key, to change the code from the second code to a third code which third code may be the same as the first code.
- 7. A magnetic key operated lock comprising a lock plate, a generally planar slide member which is movable relative to the lock plate between a locked position and an unlocking position with a magnetically coded key, and magnet pins carried by the slide member;
- the pins being distributed across and slidable transversely to a principal plane defined through the generally planar .Slide member, the pins being slidable from a first position in which the pins engage the lock plate to lock the slide member in the locked position to a second position in which the pins are disengaged from the lock plate to allow the slide member to be moved to the unlocking position, the position and polarity of the pins forming a magnetic code for the lock;
- wherein a code changing means is provided for changing the code of the lock from a first predetermined magnetic code to a second predetermined magnetic code by moving at least one magnet pin from a first location to a second location in the principal plane of the slide member;
- the code changing means comprising a rotatably mounted carrier in the slide member that rotates about an axis that extends generally transverse to the principal plane and a magnet pin slidable transversely in the carrier, which pin is arranged to engage an abutment formed in the lock plate as the slide member is moved with a code-changing key, thereby causing, while the magnet pin in the carrier is abutted against the abutment, the carrier to rotate during movement of the slide member;
- wherein at least two carriers are provided, in which each carrier has two magnet pins which are positioned on a diameter of the respective carrier.
- 8. A lock as claimed in claim 7, wherein the pins of one carrier are rotationally offset by ninety degrees relative to the pins of another carrier, and when the slide member is in the locked position, the diameter joining two pins is either aligned with the direction of movement of the slide member or perpendicular thereto.
- 9. A magnetic key operated lock comprising a lock plate, a generally planar slide member which is movable relative to the lock plate between a locked position and an unlocking position with a magnetically coded key, and magnet pins carried by the slide member;
- the pins being distributed across and slidable transversely to a principal plane defined through the generally planar slide member, the pins being slidable from a first position in which the pins engage the lock plate to lock the slide member in the locked position to a second position in which the pins are disengaged from the lock plate to allow the slide member to be moved to the unlocking position, the position and polarity of the pins forming a magnetic code for the lock;
- wherein a code changing means is provided for changing the code of the lock from a first predetermined magnetic code to a second predetermined magnetic code by moving at least one magnet pin from a first location to a second location in the principal plane of the slide member;
- the code changing means comprising a rotatably mounted carrier in the slide member that rotates about an axis that extends generally transverse to the principal plane and a magnet pin slidable transversely in the carrier, which pin is arranged to engage an abutment formed in the lock plate as the slide member is moved with a code-changing key, thereby causing, while the magnet pin in the carrier is abutted against the abutment, the carrier to rotate during movement of the slide member;
- wherein a said rotatable carrier has two magnet pins positioned on a diameter, a first of said pins forming a locking pin and a second of said pins forming the code-changing pin, said first pin engaging in an aperture in said lock plate to restrict movement of said slide member in the locked position for a first lock code, and said second pin engaging an edge of a second aperture in said lock plate during movement of the slide member with a code-changing key which unlocks the lock in the first code, to cause rotation of said carrier to change the lock code from the first lock code to a second lock code.
- 10. A lock as claimed in claim 9, wherein said second aperture has a first slot portion having an edge extending transversely of the direction of movement of the slide member for engagement by a code-changing magnet pin, and a second slot portion contiguous with said first portion and elongate in the direction of movement of the slide member, said two magnet pins carried by said carrier sliding in said elongate slot portion as said slide member returns to the locked position during a code-changing operation, said elongate slot portion being shaped to align said carrier to a preferred orientation.
- 11. A lock as claimed in claim 10, wherein said second, elongate, slot portion is widened at one end, such that said first pin can enter said widened slot portion before the slide member reaches the end of its normal stroke, on operation of the lock by a code-changing key so that any premature return of the slide member will cause the said first pin to be guided by the edge of the aperture to complete the required rotation of the carrier.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8903441 |
Feb 1989 |
GBX |
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9002222 |
Feb 1990 |
GBX |
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Parent Case Info
This is a continuation of application Ser. No. 07/743,398, filed on Oct. 3, 1991, now U.S. Pat. No. 5,267,459, issued on Dec. 7, 1993.
US Referenced Citations (6)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0024242 |
Feb 1981 |
EPX |
0276444 |
Aug 1988 |
EPX |
0304760 |
Mar 1989 |
EPX |
Continuations (1)
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Number |
Date |
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Parent |
743398 |
Oct 1991 |
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