Abstract: A door security system has a floor contacting foot pivoted on a prop, itself pivoted on a locking system attached to a door support. A bracket with opposed spaced apart face walls joined by edge wall to receive a door corner may be used to attach the door support. A hand releasable locking system has saw teeth engaging saw teeth on the door support. Prop mountings on both foot and locking system restrict the floor prop angle, which may be from 60.degree. to 70.degree., and conveniently 65.degree. to 70.degree., especially 69.degree.. The device may be installed permanently or temporarily, on a door, it is far more effective than a door chain. A ratchet may be incorporated to tighten the prop, and a release lever to `break` the prop. A floor plate with a hole may be used to fix the foot to the floor by a pin passing through a similar hole in the foot.

Abstract: A door security system has a floor contacting foot pivoted on a prop itself pivoted on a locking system adjustably attached to a door support removably mountable on a door by a detachable bracket. The system is simple to install. A door so equipped can be opened a slit for conversation but insufficient for entry, then locked in position. The bracket has opposed spaced apart face walls joined by edge wall to receive a door corner, the door support is attachable to the bracket by a wingnut. The hand releasable locking system has saw teeth engaging saw teeth on the door support. Prop mountings on both foot and locking system restrict the angle of the prop to the floor. This angle may be from 60 to 70, and conveniently is 65. The device may be installed permanently or temporarily, on a door, it is far more effective than a door chain. Both bracket and door support can be permanently fastened to the door by screws.