Lockable safety door stop

Claim 2

A door stop comprising a floor plate and a stop member releasably securable thereto, said floor plate having a flat upper surface, said floor plate being securable in a cavity in a floor surface with said upper surface flush with said floor upper surface, said stop member having a raised barrier surface and a lower surface, said flat upper surface of said floor plate having an opening therein to receive said stop member lower surface and at least one undercut recess in said opening, projection means in said lower surface of said stop member for engagement in said undercut recess, a key operated locking mechanism in said stop member to secure said stop member to said floor plate in immovable position when said stop projection means is in engagement with said floor plate undercut recess, and a closure plate having a flat upper surface and adapted to be removably positioned in said opening of said floor plate when said stop member is not secured therein whereby said opening is closed and said upper surface of said floor plate and closure plate lie in a common plane.

Claim 3

A door stop as claimed in claim 1 wherein said stop member is a wedge having an upper sloped barrier surface, a lower surface and an end surface.

Claim 4

A door stop as claimed in claim 2 wherein said locking mechanism has an actuable locking pin for engagement with pin receiving means in said floor plate to secure said wedge lower surface in immovable position in said floor plate opening.

Claim 5

A door stop as claimed in claim 2 wherein said opening in said flat upper surface has opposed side walls, an undercut recess in at least two opposed ones of said side walls, said wedge having opposed projections for engagement in a respective one of said undercut recesses, said locking mechanism having an actuable locking pin, a lock pin receiving hole in said floor plate opening, said locking pin being actuable to project from said wedge lower surface and into said hole to immovably secure said wedge member to said floor plate.

Claim 6

A door stop as claimed in claim 2 wherein said upper flat surface of said floor plate has two spaced apart openings therein with an undercut recess formed in a respective edge thereof, said wedge projection means being two spaced apart L-shaped engaging arms projecting from the lower surface thereof, each said arm having a lateral projection for engagement in a respective one of said undercut recess to retain said wedge lower surface against said floor plate upper surface.

Claim 7

A door stop as claimed in claim 4 wherein said locking mechanism comprises a housing portion with said locking pin depending therefrom, a retractable lock pin projecting from said housing portion, lock pin retracting means associated with said housing, a removable guidepin projecting from said housing, a bore having a lower wall in said wedge member adjacent said end wall for receiving said locking mechanism therein, a hole in said bore lower wall and aligned with said locking pin, a spring interposed between said housing and said lower wall and about said locking pin, a vertical slot extending through said wedge end wall for receiving said guide pin therein to restrict movement of said housing in said bore and for alignment thereof, and a transverse locking hole in said bore for rEceiving said retractable lock pin when said housing is depressed in said bore adjacent the action of said spring whereby a portion of said locking pin will project from the lower surface of said wedge member through said hole in said bore lower surface.

Claim 8

A door stop as claimed in claim 4 wherein one of said undercut recesses is of deeper width than the other recess, and one of said wedge projections is longer than the other projection, said longer projection being received in said deeper recess to permit both said projections to be engaged in a respective undercut recess.

Claim 9

A door stop for mounting in a floor behind a door in the opening direction thereof, said door stop comprising a floor plate having a flat upper surface with stop retaining means therein, said floor plate being secured in said floor a limited distance behind said door and in the immediate vicinity of the arc of swing of the outside edge of said door, said floor plate upper surface being flush with the upper surface of said floor, said stop member having a raised barrier surface for abutment with said door and a lower surface, projection means in said lower surface of said stop member for engagement with said retaining means in said floor plate, a locking mechanism in said stop member to secure said stop member to said floor plate in immovable position when said stop projection means is in engagement with said floor plate retaining means, and a closure plate having a flat upper surface and adapted to be removably positioned in said opening of said floor plate when said stop member is not secured therein whereby said opening is closed and said upper surface of said floor plate and closure plate lie in a common plane.

Claim 10

A door stop for mounting in a floor behind a door in the opening direction thereof, said door stop comprising a floor plate having a flat upper surface with stop retaining means therein, said floor plate being secured in said floor a limited distance behind said door and in the immediate vicinity of the arc of swing of the outside edge of said door, said floor plate upper surface being flush with the upper surface of said floor, said stop member having a raised barrier surface for abutment with said door and a lower surface, projection means in said lower surface of said stop member for engagement with said retaining means in said floor plate, a locking mechanism in said stop member to secure said stop member to said floor plate in immovable position when said stop projection means is in engagement with said floor plate retaining means, and a closure plate having a flat upper surface and adapted to be removably positioned in said opening of said floor plate when said stop member is not secured therein whereby said opening is closed and said upper surface of said floor plate and closure plate lie in a common plane.

Claim 11

A door stop as claimed in claim 8 wherein said floor plate is secured in said floor at a predetermined distance behind said door whereby said door will abut said stop barrier surface before said door is sufficiently open to permit entry of a person but sufficient to permit said stop member to be secured and unsecured from the opposite side of the door by a person capable of unlocking said locking mechanism.