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Air circulatory system for an enclosure

  • US 5,308,279 A
  • Filed: 10/28/1991
  • Issued: 05/03/1994
  • Est. Priority Date: 10/28/1991
  • Status: Expired due to Fees
First Claim
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1. An air circulatory system (32) adapted for use with a cab (10) of a vehicle, comprising:

  • a housing (30) having first and second compartments (34,36) and an inlet (70) defined by the housing (30) for communication with air circulating within the cab (10) into the first compartment (34) said housing providing support for a seat assembly;

    a pair of fresh air passageways (48,50) each having a first end portion (59) that defines an opening (56) in a respective one of an opposing side (14,16) of the cab (10) and a second end portion (62) that is engaged with a respective one of opposing sides (52,54) of the first compartment (34), said fresh air passages (48,50) being sufficient for communicating ambient air outside the cab (10) with the first compartment (34);

    an air duct means (78,80) having a first end portion (82) positioned for communication with the second compartment (36) of the housing (30) and a second end portion (90) that extends forwardly from the housing (30) to a position that is adjacent a front wall (18) of the cab (10) and defines a plurality of air discharge ports (102,104,110,114) that are spaced laterally from one another a distance that is substantially equal to the width of the seat assembly; and

    a blower assembly (40) positioned in the second compartment (36) and being sufficient for drawing ambient air and air circulating within the cab (10) through the first compartment (34) and into the second compartment (36) and directing it back into the cab (10) through the discharge ports (102,104,110,114) at a preselected pressure that is within a range of 0.398 to 0.439 KpA greater upon discharge from the second compartment (36) than the air that is drawn into the second compartment (36).

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