Abstract: A push lock actuable anti-theft vehicle device for a vehicle having a hood. A hood coupling member for coupling the hood to the vehicle is secured within an engine compartment of the vehicle and has a first locked position and a second unlocked position. The hood coupling member is operable by a keyed push lock member through a cable. An electrical contact is opened or closed by an engagement member of the push lock member upon actuation of the coupling member. The push lock member is manually operable to lock the coupling member and is operable by a restricted distribution key to unlock the coupling member.

Abstract: An anti-theft hood lock release blocker assembly for preventing the release of a vehicle hood latch activated by a connecting sheathed cable. A bared portion of the cable is secured by a cable connector matingly engaged to a protruding member of a platform jounaled for rotation along a limited arc required to effect release of the hood latch. A remotely controlled electromagnetically operated lever is provided for interfering with the rotation of the platform the full length of the limited arc to prevent release of the hood latch. The assembly is provided with cable clamping apparatus to facilitate the retrofit installation of the assembly into existing hood latch/cable mechanisms.

Abstract: A remotely controlled hood lock release blocker assembly for preventing the release of a vehicle hood latch which includes a cable coupled to the hood release. The cable is secured to a platform journaled for rotation along the full length of a limited arc required to effect release of the hood latch and one of an electromagnetically controlled lever and mechanical dead bolt is provided for interfering with the rotation of the platform the full length of the limited arc preventing completion thereof whereby to prevent release of the hood. A control device in the form of a key operated energizing device for the electromagnet or a key operated control for withdrawing the lever and dead bolt respectively, is provided remote from the blocker assembly for changing the condition of the lever and dead bolt from interferent to non-interferent condition respectively.

Abstract: A vibration sensitive trip switch for a vehicle alarm system or the like comprising a pair of juxtaposed generally coextensive cantilevered flat clock springs spaced one above the other. Each cantilevered spring is secured to a bracket. The upper spring extends horizontally over the lower spring with the latter canted toward the free end of the overlying spring, terminating spaced a predetermined distance below same. The springs have facing contacts at their overlying free ends, with a fine gap defined therebetween. The springs are movable in an uninhibited manner at their free ends and are weighted unequally thereat, the underlying spring carrying a greater weight than the overlying spring. A shock pad is located immediately below the free end of the underlying spring. The overlying spring is sensitive to shock caused by sharp jars resulting from impact against the windows or tires as would occur during attempted theft or vandalism.

Abstract: A shaker device for automobile alarm systems in which there is a vibratory member for making contact when the vehicle is disturbed and in which the vibratory member is damped by means of a relatively stiff cantilever supported member made out of spring wire.

Abstract: A siren for an alarm adapted to be driven by a fractional horsepower motor and provided with a cup shaped rotor cooperating with a stator provided with perforations in the cylindrical flange thereof, and a drawn, cup-shaped screen or grille seated over the inlet to said stator and having a cylindrical flange extending over the perforations of the stator but spaced outwardly therefrom, the base of the screen being engaged on the stator rim. The intake air flow of the siren is restricted by the perforations of the screen which increases the velocity of the intake air, thereby increasing the efficiency of the siren which enables reduction of the current usage requirements. The harmonics of the output sound are increased by the perforated cylindrical flange of the screen thereby increasing the volume and pitch of the emitted sound.

Abstract: An electric key-operated switch adapted to be mounted on the exterior of a vehicle or structure to arm or disarm an alarm system. A key is to be rotated in a cylinder between two positions, each of which controls a separate circuit that is normally open when the contact rotor carried by the cylinder is not engaged with contacts connected to the respective circuit. The invention provides more positive electrical engagement and a novel structure for economically adjusting the limits of positions of the contact rotor so that the key may readily be inserted and removed.

Abstract: A siren for an alarm adapted to be driven by a fractional horsepower motor comprising a cup-shaped rotor cooperating with a stator having rectangular perforations in a cylindrical flange, the cup-shaped rotor and the stator being both formed as stampings, the rotor having an integral base plate staked to a hub, the base plate having a plurality of shear-formed upstanding vanes of identical irregular polygonal configuration circumferentially arranged around the center of the base plate, the cylindrical wall of the rotor having rectangular perforations equal in number to the number of vanes and each vane having a perforation adjacent thereto at the identical respective location.