Patent GB-703359-A (GB)
Title: Improvements in heating and ventilating systems for vehicles
Inventor: STEADMAN CLIFFORD STUART
IPC: B60H1/00
Filed: 1950-11-17
Abstract: 703,359. Ventilating vehicles. SMITH & SONS (ENGLAND), Ltd., S. Nov. 16, 1951 [Nov. 17, 1950], No. 28208/50. Class 137. [Also in Group XIII] A heating and ventilating system for a vehicle comprises first and second compartments adapted to be supplied respectively with heated and cool air, a valve chest Whence air :passes to the vehicle, a first port between the ,first compartment and the valve chest, a second port between the second compartment and the valve chest, first and second mechanically-linked adjustable valve elements co-operating with said ports, in a first extreme position of their range of adjustment serving to close both ports and in the other, second extreme -position serving to open fully the first port and close the second, and over part of a range of intermediate positions 'to open partially both ports, a shroud being provided in the neightbourhood of the'first port so that over the first part of the range of adjustment from the first extreme position, passage of air from the first compartment to the valve chest is blocked and a supply of cold air alone is fed to the valve chest. In the vehicle heater shown, air is forced by a fan .(not shown) to the inlet 5 of a casing whence a portion of the air passes through a heater element 2 heated by the engine coolant water, to a hot air compartment 6 while the remainder of the air passes unheated to a compartment 15. Chests 10, 11 (Fig. 3) communicate with the compartments 6 and 15 by way of ports 16, 17 and 22, 21 respectively. Interconnected flap valves 23, 24 are provided in the chest 11 and interconnected flap valves 18, 19 are provided in the chest 10 which includes also a further flap valve 28 spring biased to a normal position in which it does not materially affect the flow of air through the port 17. The valve pivot shafts are independently controlled through linkages and cables. The chest 11 communicates through openings 13 with the vicinity of the windscreen and the chest 10 communicates through .an opening 12 with the vehicle interior, In the "off" position, valve 18 closes port 17 whilst its associated valve 19 closes port 16 and valve 23 closes port 22 whilst its associated valve 24 closes port 21. In this position no air may pass through the openings 12, 13. As the valve pivot shaft 20 is rotated counterclockwise port 16 is partially opened whilst port 17 remains effectively closed by engagement of valve 18 with -a shroud 26 formed in the wall of the chest 10. A flow of cold air is thus permitted to the vehicle interior. As rotation of the shaft 20 is continued hot air from the space 6 is permitted to flow to the chest 10 .whilst flow of cold air to the chest 10 from the space 15 is eventually prevented by the valve 19, as shown in Fig. 3. Further rotation of the shaft 20 .operates to cut off the hot water supply to .the heater so that in the extreme position of the shaft, all the air flowing to the vehicle is cold. Similarly, as the shaft 25 is rotated clockwise the air flow to the vicinity of the windscreen by way of openings 13 varies from cold to hot, and at the same time, when the valves 23, 24 are in the extreme position shown in Fig. 3, ;the valve 28 is caused to move by a lever 33 (Fig. 4) attached to the shaft 25, .to the position shown in which it closes port 17 thus obstructing the flow of hot air to the vehicle space and allowing all the heated air to flow through ducts 13 to the vicinity of the windscreen for de-icing purposes.