The device is used for security by e.g the occupier of a hotel room. A toggle-type self-gripping mechanism is provided with thin jaw-blades. The blades are entered into the slot or gap between a door and a door jamb. The jaws engage the door-bolt, and the device enables a heavy gripping clamp to be applied to the bolt. The thin jaws do not buckle under the heavy clamping because they are constrained against buckling by the slot. A screw-clamp may be substituted for the toggle-clamp.

A portable lock for locking a door has a lock bar for insertion and retention between a door jamb and the latch side of a door. A housing is movable along the lock bar between a retracted position enabling pivoting movement of the door about its hinge between closed and open positions and a forward position engageable with the door in the closed position. A lever arm locking mechanism is movable between first and second positions for locking the housing in the forward position to prevent movement of the door from the closed position to the open position.

A portable, adjustable door lock device and method of use therefore, which provides a device having a first and second blade member which are pivotably pinned together, thus, forming substantially a "V-shaped member" having two pointed ends, with the ends being insertable and adjustably positionable between the edge of a door and the striker plate affixed to a door frame, so as to frictionally capture the reciprocable bolt therein, thus, preventing opening of the door from the exterior side.

Apparatus is simply hung on a deadbolt knob when the deadbolt is in locked position. It prevents the deadbolt knob from rotating enough to retract the deadbolt. This ensures that the door cannot be unlocked from the outside. A passage in an upper end of the apparatus is dimensioned to receive the deadbolt knob. The deadbolt knob is not round. The passage has side walls narrow enough to prevent the deadbolt knob from rotating freely within the passage. As the knob is rotated, the knob engages the side walls of the passage so that the entire apparatus rotates until the lower end of the apparatus engages a fixed element that prevents further rotation of the knob. That fixed element is either the doorjamb or the doorknob. This immobilizes the knob and deadbolt.

A drum closure which establishes a connection between the body of a drum and lid, wherein the connection will prevent separation of the lid from the body under severe loading conditions such as dropping the drum from a height of thirty (30) feet.