Abstract: An improved speaker grille for incorporation in the housing of a light/siren assembly of a type which is mounted across the roof of a police car or other emergency vehicle, the improved grille being designed to significantly reduce the drag coefficient of the light/siren assembly due to the unique location of the grille openings.

Abstract: An electrically synchronized rotating light system comprising two or more rotating light assemblies each having an associated drive motor, there being in one embodiment a master light unit including a rotating light and drive motor which rotates the light at a predetermined rate, and one or more slave light units each including a rotating light and a slave drive motor, the master and slave units being electrically wired so the speed of rotation and phase of each slave unit is synchronized with the master unit without need for mechanical connections between the units. In another embodiment, two or more slave lights are provided, each having an associated slave drive motor, in combination with a master drive motor not associated with a corresponding light. In a further embodiment, each rotatable light has an associated motor mounted directly on the lampholder for conjoint rotation with the lampholder.

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: A specialized sign fitting together with the process of using said sign fitting to install signs on sign supports, such as walls, is disclosed. The specialized sign fitting includes a threaded male member having a protruding attachment member, such as a wood screw, for fastening to the back of the sign. The fitting has an overlying female member having the external configuration of a bolt. This mounted bolt configured female member is used to rotate and fasten the male member at the protruding attachment member into the sign. With a plurality of fasteners installed on the back of the sign, the female members are removed to expose male member mounted scribes. In the shop, these female member mounted scribes are then impressed with the sign iself onto a sign mounting templet. In the field, the templet containing both the scribed locations of the sign fasteners as well as typically an outline of the sign is first hung on the sign mounting location.

Abstract: A low energy sign contruction is illustrated for illumination of signs of the type having translucent illuminated faces. An opaque sign border is bridged by a reflector extending generally parallel to the illuminated face and having a truncated sawtooth profile. For single sided signs, one set of sawtooth points is truncated; for dual sided signs, both set of sawtooth points are truncated.Bayonet mounted lighting sockets are mounted at apertures in the respective truncations and utilize the metallic reflective surface as one side of a low voltage (10.5-volt) AC circuit. The reflector forms a cooled heat sink mounting the bulbs as well as a supporting matrix. The lamps, as mounted to this supporting matrix, are typically spaced at distances which do not exceed twice the distance of the lamp filament to the translucent face. By the expedient of using 14-volt lamps, prolonged lamp life with low energy illumination results.

Abstract: A specialized sign fitting together with the process of using said sign fitting to install signs on sign supports, such as walls, is disclosed. The specialized sign fitting includes a threaded male member having a protruding attachment member, such as a wood screw, for fastening to the back of the sign. The fitting has an overlying female member having the external configuration of a bolt. This mounted bolt configured female member is used to rotate and fasten the male member at the protruding attachment member into the sign. With a plurality of fasteners installed on the back of the sign, the female members are removed to expose male member mounted scribes. In the shop, these male member mounted scribes are then impressed with the sign itself onto a sign mounting templet. In the field, the templet containing both the scribed locations of the sign fasteners as well as typically an outline of the sign is first hung on the sign mounting location.

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.

Abstract: A motor controller for use in railway-crossing signal-gate mechanisms is provided herein. The controller is of a cam type which includes a cam assembly having a movable cam insert that cooperates with a cam follower and switch assembly. The switch controls the gate arm raising motor. The cam insert and cam follower are arranged such that when the gate arm approaches the upright position the cam insert slides quickly or snaps to a position, which permits the switch contacts to open quickly, thereby minimizing arcing between the switch contacts. Moreover, with the cam insert in this position, oscillation of the gate arm about the upright position, which is caused by the gate arm striking the arm stops and bouncing back, is minimized.