Locks – Operating mechanism – Key
Patent
1993-04-22
1994-03-22
Gall, Lloyd A.
Locks
Operating mechanism
Key
70373, 70375, 70379R, 70386, 70421, 70422, 70DIG30, 70DIG62, E05B 2700
Patent
active
052953769
ABSTRACT:
A combinating tumbler lock featuring zero clearance between the lock plug and mounting shell including: a mounting shell having a central throughbore with a front section having a first, greater diameter and including longitudinal locking grooves, a rear section having a second smaller diameter and including longitudinal stopping grooves, and a tapered transition section between the front and rear sections; a lock plug for selective rotation within the mounting shell and having three sections corresponding in diameter to the sections in the mounting shell, the lock plug front section including a tumbler receiving opening, the lock plug rear section including a cam-receiving structure and a first radial throughbore, the lock plug also including a second radial throughbore between the front section and the tapered section; a tumbler disposed in the lock plug for selective engagement with the longitudinal locking grooves of the shell; a spring loaded stop comprising two spherical balls actuated by a compression spring disposed within the first radial throughbore to provide positive stop positioning and feel by selective engagement with the stopping grooves; and a spring loaded bearing in the form of two spherical balls actuated by a compression spring and disposed within the second radial throughbore.
REFERENCES:
patent: 1977189 (1934-10-01), Larson et al.
patent: 4381656 (1983-05-01), Hayakawa
patent: 4715201 (1987-12-01), Craig
patent: 4890467 (1990-01-01), Krause et al.
patent: 4956983 (1990-09-01), Okamura et al.
patent: 5040652 (1991-08-01), Fish et al.
patent: 5121618 (1992-06-01), Scott
Fort Lock Corporation
Gall Lloyd A.
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