Abstract: A transport refrigeration system having a structural framework supporting a refrigeration unit including a condenser heat exchanger supported in an upper region of the framework and an engine and an electric generator powered by the engine supported by the framework in an engine compartment in a lower region of the framework, includes a pair of vertically disposed condenser fan/motor assemblies disposed aft of the condenser heat exchanger in side-by-side relationship and above the engine compartment; and a flow partition extending vertically between the pair of condenser fan/motor assemblies.

Abstract: An engine driven generator (17) is provided with first and second stage fans (41,42) at one end thereof. The two-stage fan system draws in ambient air and forces it through the generator windings (38) and rotor-stator air gap (37,39) for the purpose of improving generator cooling. Stationary guide vanes (49) are disposed between the two fans (41,42) for the purpose of de-swirling the flow therebetween. The fans are of the centrifugal type and are preferably backward curved.

Abstract: An engine driven generator (17) is provided with first and second stage fans (41,42) at one end thereof. The two-stage fan system draws in ambient air and forces it through the generator windings (38) and rotor-stator air gap (37,39) for the purpose of improving generator cooling. Stationary guide vanes (49) are disposed between the two fans (41,42) for the purpose of de-swirling the flow therebetween. The fans are of the centrifugal type and are preferably backward curved.

Abstract: A transport refrigeration system having a structural framework supporting a refrigeration unit including a condenser heat exchanger supported in an upper region of the framework and an engine and an electric generator powered by the engine supported by the framework in an engine compartment in a lower region of the framework, includes a pair of vertically disposed condenser fan/motor assemblies disposed aft of the condenser heat exchanger in side-by-side relationship and above the engine compartment; and a flow partition extending vertically between the pair of condenser fan/motor assemblies.

Abstract: A plurality of resistance heater rods are assembled in parallel relationship between the plurality of normally extending brackets and their associated retainers to comprise a subassembly which is then attached as a unit to an evaporator coil. Each of the coils is a continuous element that forms a complete loop with the ends then overlapping such that they are generally centrally located but are located on either side of midpoint such that their movement is not interfered with by other existing structures.

Abstract: A module is provided for attachment to the roof of a bus and includes all of necessary components for conditioning the return air from the passenger compartment and delivering conditioned air thereto. A module can be ganged in various relationships to collectively provide the total capacity required by the bus. Each module includes an evaporator section, a condenser section and a power section including a compressor and an inverter. The evaporator sections have a return air compartment that extends a substantial distance across the roof of the bus such that a single design can meet the needs of various return air duct installations of various types of buses. Provision is made for the selectively mixing of return air with fresh air, with the mixture then being passed by the evaporator blower through the evaporator coils and into the supply air ducts.

Abstract: Rather than having a frame into which, or upon which, an air conditioning system is mounted, a bus rooftop air conditioning module has a unibody which is formed partially of structural members interconnected to the tube sheets of the evaporator and condenser coils to form a structural body which supports the components of the system. In this way the coil tube sheets combine with other structural members to form the supporting body.

Abstract: A bus rooftop air conditioning system is made up of one or more self-contained modules having one or more evaporator sections and one or more condenser sections, with each extending transversely across the width of the bus, and with the evaporator sections fluidly communicating with both a common return air opening and a common supply air opening of the bus. The modules may be of a single unit configuration with a single condenser section and a single evaporator section or they may be of a double unit configuration having two condenser sections and two evaporator sections. The total capacity requirements are met by combining the use of single units and double unit configuration, with each of the evaporator sections communicating with a single return air opening and a single supply air opening in a bus.

Abstract: A module is provided for attachment to the roof of a bus and includes all of the necessary components for conditioning the return air from the passenger compartment and delivering conditioned air thereto. A plurality of modules can be mounted in various relationships to collectively provide the total capacity required by the bus. Each module includes an evaporator section, a condenser section and a power section including a compressor and an inverter. The evaporator sections have a return air compartment that extends a substantial distance across the roof of the bus such that a single design can meet the needs of various return air duct installations of various types of buses. Provision is made for the selective mixing of return air with fresh air, with the mixture then being passed by the evaporator blower through the evaporator coils and into the supply air ducts.

Abstract: A module is provided for attachment to the roof of a bus and includes all of necessary components for conditioning the return air from the passenger compartment and delivering conditioned air thereto. Each module includes an evaporator section, a condenser section and a power section including a compressor and an inverter. The evaporator sections have a return air compartment that extends a substantial distance across the roof of the bus such that a single design can meet the needs of various return air duct installations of various types of buses. Provision is made to interconnect a evaporator discharge opening with a supply air duct for the bus by way of a flexible duct having integrally formed end plates for connection by way of fasteners. The lower end plate which is secured to the supply air duct also includes an upstanding flange for connecting a protective cover thereto.

Abstract: In a bus rooftop air conditioner having a fresh air inlet for routing fresh air to an evaporator coil by way of a passageway and including a frame located in the passageway for the receiving a filter therein. A hinge mounted grill has a body portion for covering the fresh air inlet, while at the same time having a extended arm coming into contact with the filter to hold it in position. The filter can be removed and replaced by simply rotating the grill member to an open position to thereby disengage the extended arm from the filter and allow it to be removed. The grill member has integrally connected and substantially normally extending guide vanes near its other end which, when the grill is the covering position, extends into a condenser discharge opening to thereby act as diffusers within that opening.

Abstract: A lifting device for a portable air purifying unit that includes a rectangular main support member for supporting all the component parts of the unit so that they are balanced about the support. A housing comprising a top cover and front and rear covers is attached to the support for enclosing the unit. The top cover is coextensive with the top wall of the support and contains a raised partition that extends laterally across the cover. A hand-hold passes through the center of the partition that opens into an enclosure mounted on the cover in front of the partition. The hand-hold and the chamber combine to form a handle. The front cover of the housing passes over the handle to partially shield the handle thereunder.

Abstract: An air handling unit that includes a main support member and front, rear and top covers mounted on said support that forms a housing for enclosing said unit. The covers have side walls that close over the support frame in abutting contact to form an interlocking seam therebetween at closure. Ribs are mounted upon the side walls of the support frame which bias the side walls of the covers outwardly to render the seam relatively air tight at closure. Two covers are securely affixed to the main support member while the other is removably attached to the main support member by a latching means. A HEPA filter is mounted in the main support member along with a blower system for drawing air through said housing.

Abstract: Apparatus for closing the front of an air purifying unit that includes a main support frame upon which is secured a rear cover and a top cover. A removable front cover is arranged to pass over the front section of the support frame and closes against the top and rear cover. A latching device acts between the support frame and the top cover to secure the cover to the frame. Biasing members are mounted upon the support frame for urging the walls of the front and rear covers outwardly and guiding the covers into edge to edge alignment.

Abstract: Apparatus for aligning and mounting a circuit board in a confined space that includes a pair of mounting pads extending outwardly from a wall. A tab is mounted on the wall over the pads so that a circuit board can be received between the pads and the tab. A rest mounted apart from the wall for supporting the board in a desired plane and a fastener for securing the board to the rest.

Abstract: Apparatus for retaining electrical cords of varying thickness within an open top channel. Retaining members are mounted alternately on each of the side walls of the channel each having steps that include a top step adjacent the bottom wall of the channel and a bottom step adjacent the open top of the channel. A service cord having a first thickness can be friction fitted between the top step of each member and the opposite side wall of the channel. Similarly a service cord having a greater thickness can be friction fitted between the bottom step of each member and the opposite side wall of the channel.

Abstract: A filter assembly for use in an air purifier unit having a rectangular shaped air inlet entrance to the unit blower. A rectangular shaped frame containing a HEPA filter pack is slidably received within the blower inlet. An L-shaped flange surrounds the filter frame and closes against the air inlet of the blower to provide an air seal. The top wall of the flange is offset some distance from an adjacent wall of the frame to provide a handle for the filter assembly.

Abstract: A bulb mounting for air handling equipment indicator bulbs that include at least a lamp base having a top flange. The mounting includes an air handling equipment support member having a hole, and retaining surface disposed a predetermined distance above an equipment support wall, that slidably receives the lamp base so that the flange rests on the retaining surface. The mounting further includes a top cover having an opening large enough to receive the bulb, and a tube shape that presses the flange against the retaining surface. The cover top side is disposed a predetermined distance above the flange, so that the bulb is positioned and secured a precise distance relative to the top of the cover and the equipment support wall.

Abstract: According to the present invention a one-piece molded strain relief structure for an electrical conductor is provided which includes a body portion having a tortuous path directly molded therein for receiving and guiding the conductor. The tortuous path includes an entrance and exit and further includes at least two changes in direction therealong. In a preferred embodiment the tortuous path is substantially S-shaped and is adapted to receive an electrical conductor having a flat cross section. The tortuous path is configured to confine the flat electrical conductor in a first orientation adjacent the entrance thereof and to cause twisting of the conductor to a second orientation angularly disposed from the first orientation as it approaches the exit thereof. A guide is provided adjacent the exit for imparting a sharp bend in the conductor as it passes therefrom.