Portable door lock and alarm

A portable door lock and alarm, for grasping a hinge of a door and for pressing against the door and doorjamb, the portable door lock and alarm comprising:

• (A) a six-sided enclosure, having a top surface, a bottom surface, elongated side surfaces and opposed end surfaces, wherein the top surface carries a top plate defining a round center hole, and wherein the bottom surface defines a mechanism opening, and wherein the side surfaces define opposed door hinge notches;
• (B) a mechanism, carried within the enclosure, having a lower claw and a bolt extending upwardly from the claw, the bolt passing through the round center hole of the top plate carried by a top side of the enclosure, the lower claw defining orthogonally oriented small and large hinge passages, wherein the claw is carried adjacent to the door hinge notches of the side surfaces;
• (C) a knob, threadedly carried by the bolt of the mechanism against the top plate of the enclosure, whereby tightening the knob on the bolt pulls the claw of the mechanism and the door's hinge, carried by the claw, into the enclosure and presses the bottom surface of the enclosure against the door and doorjamb, thereby preventing the door from being opened;
• and
• (D) an electronic circuit, carried within the knob, having a battery, connected to an annunciator and a switch, whereby motion resulting from movement of the door results in the switch being closed and the annunciator being activated.