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US 2003/0188558 A1Published application
Removable plug cylinder lock
AssigneeLock America, Inc.
InventorsMing Liang Shiao, Frank Minnella
Life of this patent
Estimating the term…
Abstract
A removable locking plug that is easily inserted and/or removed from the cylinder portion of the locking mechanism. In the preferred embodiment, the plug is enclosed in a case hardened steel housing and contains a tumbler keyed locking mechanism.
Claims6
A plug removable cylinder lock, comprising:
- a cylinder having
- a hollow interior;
- a forward and rearward aperture opening;
- a flange extending radially outward on said forward aperture opening;
- a flange extending radially inward on said rearward aperture opening;
- an alignment member on the interior of said cylinder at the rearward aperture opening of said cylinder;
- at least one locking notch cut through the wall of said cylinder at said rearward aperture opening of said cylinder;
- a cylindrical tumbler-key plug having
- forward face and a rearward face;
- a keyed tumbler mechanism;
- a corresponding keyhole extending radially inward from said forward face;
- a controlling latch member affixed on the side of said plug at said rear face such that said latch can radially extend or retract in cooperation with a key inserted in said keyhole;
- a cylindrical casing having a cap immovably affixed at the each end of said casing;
- said cylindrical key plug having at least one alignment notch at said rearward face adapted to engage said alignment member when said latch is aligned with said locking notch;
- whereby said latch can only be operated when said plug is seated and properly aligned by said alignment member.
12 more elements
A removable core cylinder lock, comprising:
- a cylinder having an axially extending cavity including a forward casing aperture and a rear cylinder aperture;
- a flange extending radially outward from said forward aperture opening;
- an alignment member extending radially inward at said rear cylinder aperture;
- at least one cut out locking notch at said rear aperture opening;
- a cylindrical, rotatable key plug having a forward face and a rear face and adapted to be axially insertable into said cavity;
- at least one alignment cut out notch in said rear face to accommodate said alignment member for preventing rotational movement of said plug;
- a latch member extending and retracting from the sidewall of said plug and adapted to be received by said locking notch when aligned therewith;
- and
- key operated locking means coupled to said latch member for controlling latch member movement;
- whereby said latch member can operate only when said alignment member is engaged in said alignment cut out and said latch is aligned with said locking notch.
7 more elements
The method of easily installing a cylindrical, locking plug into a hollow cylinder, comprising the steps of:
- inserting said plug axially into said hollow cylinder until said forward axial motion of said plug is stopped by an alignment member;
- rotating said plug until said plug seats onto said alignment member through an alignment cut out on said plug;
- rotating a key in said plug until said key stops rotating, thereby extending a plug latching member into a cut out locking notch in said cylinder;
- and
- removing said key from said plug.
2 more elements
Dependencies are inferred from the claim text.