Locks – Operating mechanism – Using a powered device
Patent
1978-11-13
1981-08-25
Frazier, Roy D.
Locks
Operating mechanism
Using a powered device
70360, 70413, E05B 4700
Patent
active
042852200
ABSTRACT:
A magnetically operable key comprises a cylindrical casing containing a turnable member, a drive member and a latch, which are all co-rotatably mounted in the casing with the drive member axially displaceable between the turnable member and the latch within the casing. The drive member has a groove defined thereon which has two circumferential portions and a slanted portion interconnecting the circumferential portions. An engagement pin is connected to the casing and extends into the guide groove for causing axial movement of the drive member when the drive member is rotated and when the pin is disposed in the slanted portion. At least one magnetic piece is pivotally mounted to the turnable member and movable by a magnetic key from a misaligned position to an aligned position. The drive member has a cavity for receiving the magnetic piece when aligned to permit axial movement of the drive member. The misaligned magnetic piece abuts against the drive member and prevents axial movement thereof. In this position, the engagement pin rides within one of the circumferential grooves closest to the turnable member. This permits only limited rotation of the drive member. The engagement pin is prevented from entering the slanted groove portion by the engagement of the magnetic piece.
REFERENCES:
patent: 1855697 (1932-04-01), Sullivan
patent: 3421348 (1969-01-01), Hallmann
patent: 3566637 (1971-03-01), Hallmann
patent: 3584484 (1971-06-01), Hallmann et al.
patent: 3602020 (1971-08-01), Kajita
patent: 3782147 (1974-01-01), Hallmann
patent: 3967479 (1976-07-01), Vick
patent: 3974669 (1976-08-01), Stackhouse
Frazier Roy D.
Pietruszka Carl F.
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