Abstract: A variable air circulation system for the cab enclosure of an off-highway vehicle is disclosed and described. The system provides for adjustment of the ratio between fresh air circulation and recirculation of cab air. Fresh air is introduced into the cab through a fresh air inlet having a fresh air filter therein. The air inlet leads to a circulation conduit. When a cab door is opened, a valve to the conduit is opened. When the door is closed, the air pulse created in the cab is effective, through the valve, to dislodge dust and dirt from the filter.

Abstract: A fixed air circulation system for the cab enclosure of an off-highway vehicle is disclosed. Fresh air is introduced into the cab through a fresh air inlet having a fresh air filter therein. The air inlet leads, through a manifold or fresh air duct, to the inside of the operator's compartment. When a cab door is opened, a bypass valve to the conduit is opened. When the door is closed, the air pulse created in the cab is effective, through the bypass valve or normal openings with the blower off, to dislodge dust and dirt from the filter.

Abstract: A fixed air circulation system for the cab enclosure of an off-highway vehicle is disclosed. Fresh air is introduced into the cab through a fresh air inlet having a fresh air filter therein. The air inlet leads, through a manifold or fresh air duct, to the inside of the operator's compartment. When a cab door is opened, a bypass valve to the conduit is opened. When the door is closed, the air pulse created in the cab is effective, through the bypass valve or normal openings with the blower off, to dislodge dust and dirt from the filter.

Abstract: A variable air circulation system for the cab enclosure of an off-highway vehicle is disclosed and described. The system provides for adjustment of the ratio between fresh air circulation and recirculation of cab air. Fresh air is introduced into the cab through a fresh air inlet having a fresh air filter therein. The air inlet leads to a circulation conduit. When a cab door is opened, a valve to the conduit is opened. When the door is closed, the air pulse created in the cab is effective, through the valve, to dislodge dust and dirt from the filter.

Abstract: A method and apparatus for providing a cab pressure drop warning to an off-road machine operator and instructions for increasing the cab pressure and for providing incentive to correct the pressure drop, the method including comparing ambient and cab pressures and threshold pressure (i.e., the ambient plus a differential value), causing a vehicle operation disruption for at least a short period during which the operator may elect to remedy the cab pressure drop.

Abstract: A method and apparatus for providing a cab pressure drop warning to an off-road machine operator and instructions for increasing the cab pressure and for providing incentive to correct the pressure drop, the method including comparing ambient and cab pressures and threshold pressure (i.e., the ambient plus a differential value), causing a vehicle operation disruption for at least a short period during which the operator may elect to remedy the cab pressure drop.

Abstract: A method and apparatus for providing a cab pressure drop warning to an off-road machine operator and instructions for increasing the cab pressure and for providing incentive to correct the pressure drop, the method including comparing ambient and cab pressures and threshold pressure (i.e., the ambient plus a differential value), causing a vehicle operation disruption for at least a short period during which the operator may elect to remedy the cab pressure drop.

Abstract: A combine including an improved HVAC control system. The frame of the combine supports an operator cab, a harvesting head and the other operational systems of the combine. The control system includes an operator control and a heat exchanger located in the cab. The control system also includes at least one sensor disposed to sense at least one of an ambient air temperature, a cab air temperature and solar loading, and to produce at least one sensed signal representative thereof. The operator control is configured to produce a set-point signal representative of a desired cab air temperature. An interface circuit is electromagnetically coupled to the valve assembly, the operator control, and the at least one sensor. A cooling coil may also be located in the cab, wherein the interface circuit is electromagnetically coupled to the associated coolant compressor.

Abstract: A window is provided in the cab of a combine, in visual alignment with a window in the harvest bin, and another window in a harvest bin extension if provided, for observation of the interior of the harvest bin by the combine operator. The window in the cab of the combine is pivotally mounted about a horizontal axis near the bottom of the window, such that it may be opened to clean the outside surfaces of the cab, the harvest bin, and the harvest bin extension windows.

Abstract: A wrist rest is disclosed for use with a large construction or farm vehicle having a rotatable operator's seat. The rest is associated with joystick-like control mechanisms and assures that the operator's arm remains positioned stationary relative to the joystick control mechanism. That is, even if the operator were to rotate about the cab in his seat the rest will ensure that the operator's arm remains operably positioned stationary with respect to the joystick control mechanisms. The rest is releasably fixed to a control console and may be released and rotated or moved vertically to any desired position. In addition, the rest is configured to have a slanting portion that will overlie a corresponding slanting portion on the control console and allow the arm rest to be placed in a stowed position where it directly overlies the control console and is out of the operator's way.

Abstract: A tilt steering wheel assembly has a steering column that may be pivoted to a variety of tilt positions for adjusting the steering wheel to the comfort of an operator of a motor vehicle. The range of adjusted positions is limited between comfortable driving positions. A latch lever is provided for releasing the steering wheel from one of the adjusted positions so that it may be tilted to another of the adjusted positions. The lever is limited in its rotatable travel to limit the range of adjustable positions, but may be released from this limitation so that the steering column and steering wheel may be tilted to an extreme position for servicing components connected to the steering column.

Abstract: A vehicle cab duct arrangement allows an operator to gain access to two vents typically included in an air circulation system from a single opening for maintenance or replacement of filters. A fresh air vent communicates air into the housing from the outside environment and an interior vent recirculates air from the cab into the inlet plenum. Filters are received in both vents for removing impurities from the air passing into the inlet plenum. The fresh air vent has a removable grill that allows access to the filter, and the interior vent is spaced from the fresh air vent opening such that it is accessible from the opening so that the interior vent filter may also be removed for maintenance. The two vents are disposed parallel with respect to each other and the vehicle cab door, so that when the vehicle cab door is closed, air is forced inwardly through the interior vent and towards the filter on the fresh air vent to clean the filter.

Abstract: An apparatus is disclosed that aids an operator in entering or leaving the cab of a large construction or farm vehicle. This apparatus consists of a series of steps leading from the ground up into the cab of the vehicle and two guide rails that guide the operator up into the cab. A first guide rail is fixed to the cab outer housing, and a second guide rail is fixed to the inner face of the cab door that provides access to the cab. The cab door guide rail is angled and positioned so as to aid in guiding the operator into or out of the cab and is also positioned so as not to interfere with the use of any accessories that may be mounted within the door. In addition, the cab door guide rail is useful as a door handle and allows the operator to guickly enter or exit the cab.