Abstract: A regenerative burner or heat exchanger has a housing with a removable media bed, which can be removed from the housing for regeneration, replacement or other treatment of the media. A spare media bed can be prepared with new, renovated or otherwise treated media and ready to replace the bed in the heat exchanger with minimal delay. Another heat exchanger housing has a detachable lower section, containing heat exchange media, which can be moved for regeneration, replacement or other treatment of the media.

Abstract: When manually closed, switches in pads select toy vehicles and the operation of motors for moving the vehicles forwardly, rearwardly, leftwardly and rightwardly and moving upwardly and downwardly (and rightwardly and leftwardly) a receptacle for holding transportable elements (e.g. marbles). When sequentially and cyclically interrogated by a central station, each pad sends through wires to the station signals indicating the switch closures in such pad. Such station produces first binary signals addressing the vehicle selected by such pad and second binary signals identifying the motor control operations in such vehicle. Thereafter the switches identifying in such pad the motor control operations in such selected vehicle can be closed without closing the switches addressing such vehicle. The signals for each vehicle are transmitted by wireless to all of the vehicles at a common carrier frequency modulated by the binary signals.

Abstract: When manually closed, switches in pads select toy vehicles and the operation of motors for moving the vehicles in different directions and moving in different directions a receptacle for holding transportable elements (e.g. marbles). When interrogated by a central station, each pad sends through wires to the station signals indicating the switch closures in such pad. Such station produces first binary signals addressing the vehicle selected by such pad and second binary signals identifying the motor control operations in such vehicle. Thereafter the switches identifying in such pad the motor control operations in such selected vehicle can be closed without closing the switches identifying such vehicle. The first and second signals for each vehicle are transmitted by wireless to all of the vehicles at a common carrier frequency modulated by the first and second binary signals.

Abstract: When manually closed, switches in pads select toy vehicles and the operation of motors for moving the vehicles in different directions and moving upwardly and downwardly (and rightwardly and leftwardly) a receptacle for holding transportable elements (e.g. marbles). When interrogated by a central station, each pad sends through wires to the station signals indicating the switch closures in such pad. Such station produces first binary signals addressing the vehicle selected by such pad and second binary signals identifying the motor control operations in such vehicle. Thereafter the switches identifying in such pad the motor control operations in such selected vehicle can be closed without closing the switches identifying such vehicle. The first and second signals for each vehicle are transmitted by wireless to all of the vehicles at a common carrier frequency modulated by the first and second binary signals.

Abstract: An electrical connector includes a base, a contact housing plate and a cover. The contact housing plate is coupled to the base and includes an electrical receptacle which is adapted to engage an electrical plug. The cover is also coupled to the base and overlies the contact housing plate. The cover has an inclined surface which extends toward the base and an opening therein forming a recess for receiving the electrical plug that is engageable with the electrical receptacle. The electrical connector may further include a plurality of electrical receptacles and openings for receiving multiple electrical plugs. The electrical connector may also include a circuit board which may contain an on/off switch and a circuit breaker with surge suppression. In addition, the plug of the power cord for the electrical connector may contain a built-in GFCI circuit.

Abstract: An electrical connector includes a base, a contact housing plate and a cover. The contact housing plate is coupled to the base and includes an electrical receptacle which is adapted to engage an electrical plug. The cover is also coupled to the base and overlies the contact housing plate. The cover has an inclined surface which extends toward the base and an opening therein forming a recess for receiving the electrical plug that is engageable with the electrical receptacle. The cover also includes a lid, which is movable between an open position and a closed position. When the lid is in the open position, the contact housing plate is exposed, facilitating access to the electrical receptacle. When the lid is in the closed position, the lid protects the electrical plug from debris and dislodgement from the electrical receptacle. The electrical connector may further include a plurality of electrical receptacles and openings for receiving multiple electrical plugs.

Abstract: An interlocking seal assembly for a universal joint which acts both to seal the bearing assembly as well as to retain the bearing block from falling off the spider in the joint. This assembly includes a resilient sealing member engaging a trunnion and having a backing ring housing the seal and adapted to be press fitted into the bearing block on the trunnion and a loose fitting generally cylindrical shield adapted to be press fitted onto a diameter of the spider. The backing ring and shield have overlapping lips providing the interlock to retain the bearing block on the spider.