Patent
1980-12-12
1982-12-28
Wayner, William E.
98 38F, 55481, 55482, 55502, 55504, F24F 316
Patent
active
043655416
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
This invention relates generally to a filtering arrangement for an air circulatory system and more particularly to the manner in which a plurality of filters are positioned and mounted within a heating and air conditioning system.
Background Art
In heating and air conditioning systems such as those found employed in the cab of an earthmoving vehicle, for example, it is common practice to draw air into a heating and air conditioning unit from the ambient air outside the confines of the cab. As the air enters the cab it passes through a filter to prevent the entry of dust etc. into the cab. It is also common practice to pass the air already within the cab back through the heating and air conditioning unit for recirculation. This air is often passed through a second filter for further cleaning before it re-enters the unit. These systems commonly supply one filter for each individual air source. These filters are independently mounted and are often positioned in separate locations or in locations that are not easily accessible.
One such system is disclosed in U.S. Pat. No. 3,868,896 to Doll et al, issued Mar. 4, 1975. Another system with a similar filter arrangement is disclosed in U.S. Pat. No. 3,742,684 to Wait, Jr. issued July 3, 1973 and assigned to the assignee of the present invention. In the Doll et al patent the filter for the recirculated air is mounted to a hinged panel at the upper, rear portion of the cab. The panel serves as an access cover to a plenum in which the fresh air and recirculated air are mixed and both sources of air are introduced into the circulatory system by a blower that is mounted within the plenum. Also mounted within the plenum is the fresh air filter. In order to install or remove the fresh air filter it must be maneuvered around the blower and through the narrow access cover. This tends to hinder the proper positioning of the filter. In the Wait, Jr. patent, the filters for both sources of air are located in two separate locations, one being accessible from inside the cab, the other being accessible from outside the cab.
In other air circulatory systems such as those disclosed in U.S. Pat. No. 3,555,846 to C. L. Harbeck et al, issued Jan. 19, 1971 and U.S. Pat. No. 4,120,527 to Lawrence, issued Oct. 17, 1978, and assigned to the assignee of the present invention, one filter is provided for both the fresh air flow and the recirculated air flow. The ability of the filter to effectively clean both sources of air, especially in a dusty environment that is common in the operation of an earthmoving vehicle, is somewhat limited.
The present invention is directed to overcoming one or more of the problems as set forth above.
Disclosure of the Invention
In one aspect of the present invention a filtering arrangement is provided for an air circulatory system having two sources of air flow. The filters are arranged so that the combined flow of both sources of air passes through one of the filters while the other filter is provided only in the flow of one of the air sources.
In another aspect of the invention the two filters are cooperatively mounted to form a passageway through which the two air sources are combined, as well as a means for directing the air flow into one of the filters.
In yet another aspect of the invention, a mounting arrangement for both of the filters is provided that allows each filter to be easily guided into its proper position without undue regard to damaging the filters. The filters are cooperatively mounted in a location that provides easy accessibility to both the filters for simultaneous or individual servicing.
The present invention solves the problem of having an inadequately filtered air supply for an enclosure such as a cab of an earthmoving vehicle. The filtering arrangement of the present invention insures that a minimum amount of filtered air will be introduced within the cab even as the vehicle works in the dustiest of environments.
The filter elements of two sources of air are positioned in line with each other so
REFERENCES:
patent: 1990110 (1935-02-01), Bridges
patent: 2100072 (1937-11-01), Eilber et al.
patent: 2613454 (1952-10-01), White
patent: 2787946 (1957-04-01), Gannon
patent: 3318076 (1967-05-01), Baker
patent: 3517601 (1970-06-01), Courchesne
patent: 3555846 (1971-01-01), Harbeck et al.
patent: 3742684 (1978-07-01), Wait, Jr.
patent: 3868896 (1975-03-01), Doll et al.
patent: 4007875 (1977-02-01), Stolz et al.
patent: 4088463 (1978-05-01), Smith
patent: 4120527 (1978-10-01), Lawrence
Cruthis Robert D.
Marques Jerry G.
Caterpillar Tractor Co.
Joyce Harold
Perry William C.
Wayner William E.
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