Heat exchange – With vehicle feature – Heating and cooling
Reexamination Certificate
1999-07-09
2001-05-01
Lazarus, Ira S. (Department: 3611)
Heat exchange
With vehicle feature
Heating and cooling
C454S156000, C180S068400, C180S089120, C123S041490, C296S190090
Reexamination Certificate
active
06223807
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to the mounting and positioning of a heating, ventilating and air conditioning system (HVAC) and associated duct work for a skid steer loader accommodating the major components of the HVAC system on the exterior of the loader cab. The heated or cooled air is discharged directly into the cab. The components are positioned out of the way at the rear of the cab, out of the major flow of dust and debris, and yet within the normal skid steer loader profile.
Skid steer loaders are very compact loaders, and it is desirable to keep the profile, i.e. height, width and length outside dimensions, the same, with or without the HVAC system for each model. The HVAC system of the present invention is thus inside the frame structure which also provides protection from damage.
In the past, many of the skid steer loaders had open operator compartments which did not need air conditioning or heating. More recently, enclosed cabs with both heating and air conditioning are sold but the problem of placement of the compressor, condenser, evaporator, heater core and blower or fan within the existing profile of the skid steer loader has existed.
Condensers, evaporators and heater cores have been placed under the operator seats on loaders, where space is severely restricted, and also have been placed on the top of cabs of loaders. The placement on the top of the cab puts the condenser, fan and other components in a location where they may be damaged when the loader is being used. Locating components where they are out-of-the-way and protected without enlarging the loader profile or outer dimensions is desirable.
SUMMARY OF THE INVENTION
The present invention relates to heating, ventilating and air conditioning (HVAC) system for a skid steer loader that utilizes existing space for mounting the major components such as an evaporator, a heater core and a fan in an out of the way location where the components are protected from damage and are easily ducted into the cab enclosure. The components are all mounted on the exterior of the cab at the rear and adjacent the engine compartment with the ambient air inlet above the engine compartment. The components thus are kept out of the operator compartment or cab space, and they do not extend beyond the frame or cab profile in either lateral or vertical directions. Further, the components are located so that the ducting for airflow is short and the heated or cooled air will be delivered into the cab easily. The overall cost of the system is reduced as well because there is no need for long ducts.
The compressor, condenser, fan, evaporator and heater core can be conventional units. They may be located in a desired position.
In addition, a fresh air filter is utilized on the fresh air intake at the exterior of the HVAC housing, to aid in keeping the air taken into the operator cab clean and free of substantial amounts of dust and debris.
The present invention places the evaporator, heater core, fan and ducts in a place where they can be serviced easily, and are protected, but do not fill the operator's cab with equipment, nor do they use long duct work for transferring heated or cooled air into the interior of the cab.
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Abel Jeffrey A.
Asche James E.
Dahl Jeffrey A.
Marstad Laura A.
Ciric Ljiljana V.
Clark Equipment Company
Lazarus Ira S.
Westman Champlin & Kelly P.A.
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