Abstract: A spotlight is provided that employs stationary motors for positioning a light beam at a desired azimuth and elevation such that there is no blind spots of the light beam at the zenith of the azimuth and elevation. A drive train rotates the spotlight about a horizontal axis and allows the motor driving the rotation to have a stationary mounting in a base while at the same time providing the light beam of the spotlight with a range of elevation that exceeds 90 degrees from a horizontal reference plane at any desired azimuth. More particularly, a stationary motor drives a capstan, which includes a spool that winds and unwinds a cable connected to a lamp assembly of the spotlight for positioning the light beam at a desired elevation. The cable is communicated between the lamp assembly and the capstan by way of a central bore in a mast that supports the lamp assembly for rotation about a vertical axis.

Abstract: An omnidirectional siren having a plurality of hollow modules supported in vertical alignment on a single, central pole. Active modules each enclose a plurality of audio transducers (i.e., compression drivers) and a horn mechanism which guides sound waves from the drivers to an outlet in the lower surface of the module. The drivers are positioned peripherally within each module so that they can be easily accessed for repair or replacement through slots in the peripheral surface of the module.

Abstract: An improved outdoor warning siren comprising an electromechanical siren together with a multi-segment horn which effects an exceptionally smooth transition from a small high pressure area at the horn inlet to a larger low pressure area at the horn outlet thereby producing increased sound output with reduced power requirements.

Abstract: A low drag warning system for emergency vehicles having an aerodynamic design reducing turbulent flow past the housing for increased fuel economy and performance. The housing of the warning light system is provided with a pair of light globe compartments possessing an efficient aerodynamic design and a central speaker housing. The speaker housing has a downward sloped speaker grill to create a flow pattern also reducing drag. The air flow is introduced into the speaker housing with a ram effect. Outflow ports from the speaker housing circulate an air flow within the domes to prevent condensation and cool the components therein. The speaker mounted in the housing attains increased sound output using a relatively low power drive.

Abstract: A warning light system for emergency vehicles having a pair of forward rotating lights and a pair of rear rotating lights separated by a reflector structure. A cam and plunger arrangement causes the rotating light assemblies to stop at a predetermined position to serve as end lights in a secondary mode. The rotation of the light assemblies is synchronized to produce a series of inwardly moving flashes from each end of the housing.

Abstract: An improved siren including means for producing and directing sound energy against a rotatable reflector which directs the sound waves out from the siren in a generally horizontal direction and which due to rotation of the reflector about a vertical axis causes such sound waves to be directed in all horizontal directions. One embodiment includes rotor and stator means which create sound energy that is directed generally downwardly in the manner of a ring radiator, together with a reflector mounted beneath the rotor and stator for rotation about a generally vertical axis, the reflector being tilted relative to its axis of rotation to intercept the downwardly directed sound waves and direct them out horizontally thereby providing a directional siren which covers a 360 degree area due to rotation of the reflector.

Abstract: A portable lighting apparatus having a lamp assembly attached to the top of an elongated mast, preferably formed of interconnectable relatively short sections. The lamp assembly includes at least one electric lamp affixed to a horizontal shaft for rotation about a horizontal axis. Associated with the horizontal shaft are a pair of gears, suitably a vertical rack and a pinion engaged therewith, the pinion being operatively attached to the horizontal shaft. A spring associated with the pinion tends to rotate the gear in a direction which biases the engaged rack downwardly. The lower end of the rack abuts a movable pushrod generally centrally located within the hollow mast and running the length thereof. The lower end of the mast is telescopically mounted on a mast support provided with a fixed vertical stoprod which abuts the lower end of the pushrod.

Abstract: A rotating signal light for use on police cars, ambulances and other vehicles on which a warning light is required, the light being driven at a non-uniform speed of rotation for the purpose of enhancing light intensity in certain predetermined directions and reducing light intensity in other directions.

Abstract: A flashing light system for mounting on the roof of a police car or other vehicle where special warning lights are desired. The system includes a plurality of lights preferably arranged side-by-side across the width of the vehicle roof, each of the lights having associated therewith a parabolic reflector or beam-shaping lens which rotates about a vertical axis approximately coaxial with the axis of the corresponding light source thereby creating a flashing effect. The several parabolic reflectors or beam-shaping lenses are driven conjointly from a common drive motor, and the plurality of rotatable reflectors or lenses may be arranged at predetermined angles relative to one another so as to vary the sequence of the light flashes and thus create an unlimited variety of different flashing effects.

Abstract: A rotating signal light for use on police cars, ambulances and other vehicles on which a warning light is required, the light being connected with a variable voltage lamp circuit which provides a higher voltage in predetermined rotational positions of the lamp to produce enhanced light in certain directions while providing a lower voltage in other positions of the light to increase lamp life and reduce wattage requirements.

Abstract: A rotating signal light for use on police cars, ambulances and other vehicles on which a warning light is required, the light being driven at a non-uniform speed of rotation for the purpose of enhancing light intensity in certain predetermined directions and reducing light intensity in other directions.

Abstract: A flashing light system for mounting on the roof of a police car or other vehicle where special warning lights are desired. The system comprises a plurality of lights preferably arranged side-by-side across the width of the vehicle roof, each of the lights having associated therewith a parabolic reflector which rotates about a vertical axis approximately coaxial with the axis of the corresponding light source thereby creating a flashing effect. The several parabolic reflectors are driven conjointly from a common drive motor, and the plurality of rotatable reflectors may be arranged at predetermined angles relative to one another so as to vary the sequence of the light flashes and thus create an unlimited variety of different flashing effects.

Abstract: A modular housing assembly for housing a vehicle warning light system and intended for mounting across the roof of a police car or other vehicle on which warning lights are required. The housing comprises a plurality of transparent plastic panels of modular construction, there being provided a plurality of front modular panel sections interconnected in side-by-side relation and a plurality of rear modular panel sections interconnected in side-by-side relation, the front and rear panel sections being connected to one another and to a common base member.

Abstract: In a system with a plurality of loud speaker enclosures, a supervisory system is provided to monitor the speaker coils. Each enclosure has a relay, and the relay winding is series-coupled with the speaker coil, to maintain the relay contact set closed when there is continuity in the speaker coil. A fuse, also series-coupled with the relay winding and speaker coil, is sized to blow when the speaker coil shorts and reduces the series circuit impedance. Accordingly either the speaker coil open condition or the speaker coil shorted condition effects de-energization of the relay winding and releases the normally-closed contact set to signal the speaker coil trouble condition.