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US 5,044,181 AGranted
Dropbolt lock assembly
AssigneeMedeco Security Locks, Inc.
InventorsStevie C. Roop, Peter H. Field
Life of this patent
Estimating the term…
Abstract
A dropbolt lock having a pair of dropbolts movable between knuckles is assembled on a formed steel assembly plate which is attached to a base plate, the assembly plate providing the spaced knuckles. A cam operator operates the dropbolts between true dead lock positions. On the inside of the lock, a cylinder lock or a thumb turn may be assembled by a single screw. The cover is provided with attachment screws which are concealed by the locking bolt when in locked position.
Claims15
A dropbolt lock assembly of the type including:
- a plurality of spaced apart knuckles, a movable dropbolt slidable within the spaced knuckles, a cam assembly operably connected to the dropbolt to move the dropbolt from a locked position to an unlocked position, the cam assembly being operable by a cylinder lock, a cover for the cam assembly, and means for securing the lock assembly to a door to be locked with improvements comprising:
- the spaced knuckles being formed integrally with an assembly plate formed of stamped and rolled steel, a mounting base plate flush with the assembly plate means, screw holes in the assembly plate and base plate for attachment of such plates flush with the surface of a door to which the lock is mounted, and screw means for attaching the cover to the lock assembly, the screw means positioned to be accessible between the spaced knuckles only when the dropbolt is in unlocked position.
A dropbolt assembly of the type including:
- a plurality of spaced apart knuckles, a movable dropbolt slidable within the spaced knuckles, a cam assembly operably connected to the dropbolt to move the dropbolt from a locked position to an unlocked position, the cam assembly being operable by a cylinder lock, a cover for the cam assembly, and means for securing the lock assembly to a door to be locked with improvements comprising:
- the spaced knuckles being formed integrally with an assembly plate formed of stamped and rolled steel, a mounting base plate flush with the assembly plate means, screw holes in the assembly plate and base plate for attachment of such plates flush with the surface of a door to which the lock is mounted, wherein the base plate means includes at least one flat plate with an edge lip for fitting over the edge of a door on mounting.
A dropbolt assembly of the type including:
- a plurality of spaced apart knuckles, a movable dropbolt slidable within the spaced knuckles, a cam assembly operably connected to the dropbolt to move the dropbolt from a locked position to an unlocked position, the cam assembly being operable by a cylinder lock, a cover for the cam assembly, and means for securing the lock assembly to a door to be locked with improvements comprising:
- the spaced knuckles being formed integrally with an assembly plate formed of stamped and rolled steel, a mounting base plate flush with the assembly plate means, screw holes in the assembly plate and base plate for attachment of such plates flush with the surface of a door to which the lock is mounted, wherein the cover is secured to the assembly plate means by attachment means which are inaccessible when the dropbolt is in locked position, and wherein the attachment means are screws which are accessible through spaces between the spaced knuckles when the dropbolt is in unlocked position.
A dropbolt lock assembly of the type including:
- a plurality of spaced apart knuckles, a movable dropbolt slidable within the spaced knuckles, a cam assembly operably connected to the dropbolt to move the dropbolt from a locked position to an unlocked position, the cam assembly being operable by a cylinder lock, a cover for the cam assembly, and means for securing the lock assembly to a door to be locked with improvements comprising:
- the cam assembly being self-contained in a cage, means for mounting the cam assembly cage directly to the assembly plate base.
A dropbolt lock assembly of the type including:
- a plurality of spaced apart knuckles, a movable dropbolt slidable within the spaced knuckles, a cam assembly operably connected to the dropbolt to move the dropbolt from a locked position to an unlocked position, the cam assembly being operable by a cylinder lock, a cover for the cam assembly, and means for securing the lock assembly to a door to be locked with improvements comprising:
- a dropbolt is formed integral with a cam follower portion to be operated by the cam assembly, the cam follower portion formed of two surfaces extending generally at right angles to each other so that the cam follower surfaces and cam assembly assume a true dead locking position on 90.degree. rotation of the cam.
Dependencies are inferred from the claim text.