Abstract: An improved blower housing is constructed of a pair of end walls and a sidewall joined by a seam extending around at least portions of the peripheral edges of the end walls, wherein the seam is formed in two sections positioned at an angle relative to each other, the angle dividing the seam sections extending around the seam. The angle formed between the two seam sections improves the ability of the seam to resist relative movement between the sidewall and the two end walls of the blower housing due to vibrations of the sidewall and two end walls during blower operations. The seam also enables a blower housing to be constructed from a coated sidewall and a pair of coated end walls without the need for spot welds or screws along the seam joining the sidewall and end walls. What is meant by coated is a prepainted, galvanized or aluminized wall. The particular seam construction also enables the sidewall to be joined to the pair of end walls without deforming the end walls.

Abstract: A heat exchanger cell for a furnace is constructed of first and second cell divisions, each cell division having a general concave configuration and a rim extending around at least a portion of a circumference of the cell division. The first and second cell divisions are positioned adjacent each other and the rim of one cell division is folded over the rim of the other cell division and overlaps opposite sides of the rim of the other cell division forming a seam joining the first and second rims. A crease is formed in the seam joining the cell division rims and is spaced from a terminal edge of the seam. A plurality of indentations are formed in the seam traversing the crease and spaced from the terminal edge of the seam. The crease and plurality of indentations formed in the seam enable the seam to resist relative movement between the rims of the two cell divisions due to alternating heating and cooling of the cell divisions.

Abstract: An evaporator pan assembly comprises an inner pan having walls defining a pan capable of containing water. An outer pan has walls surrounding at least most of the walls of the inner pan, and there is an air space between the inner pan and outer pan walls. One end wall of the inner pan is movable relative to the adjacent outer pan end wall.

Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating substantially elliptical rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange and the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. The expander includes radially and axially moveable jaws comprising plural jaw segments which are engaged by an axially moveable mandrel. The number of jaws in the expander is sufficient to form a substantially leakproof seal between the exchanger unit and the support plate assembly in a single expander operation through a single bending sequence.

Abstract: A heat exchanger unit having opposed pan shaped sections with perimeter flanges which are folded one over the other to secure the sections together. The section having the inner flange is formed with a displaced flange portion or bead all along the perimeter flange portions, which bead is elastically displaced by the folded over flange to form a substantially leakproof joint.

Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating oval rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange on the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. A second expander apparatus is inserted in the opening after withdrawal of the first expander to engage and expand portions of the flanges which were not fully displaced by the first expander. The expander mechanisms include radially and axially movable jaws comprising plural oval shaped jaw segments which are engaged by an axially movable mandrel.

Abstract: A furnace heat exchanger and support plate assembly are joined together at respective openings for the burner assembly and for the combustion products outlet by an oval rim defining the heat exchanger opening and a cooperating flange on a partition plate and extending perpendicular to the plane of the plate. The flange on the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings to form a leakproof joint. An improved method of forming the joint includes the use of an expander mechanism which may be inserted through the opening in the plate into the interior of the heat exchanger and engaged with the plate flange to expand the flange radially outwardly. A complete nonwelded furnace heat exchanger assembly includes one or more support members which are secured to flanges of the heat exchanger units without welding or mechanical fasteners.

Abstract: A plate assembly is secured to a heat exchanger unit for a hot air furnace at each of one or more apertures in the unit by expanding a flange extending around an aperture on the plate within the aperture in the unit to cause such flange to conform to the exact shape of the aperture in the unit and form a leak-proof joint between the heat exchanger unit and plate assembly.

Abstract: A furnace heat exchanger and support plate assembly are joined together by a cooperating oval rim defining an opening in the heat exchanger and an opening formed by a mating flange on a partition plate and extending perpendicular to the plane of the plate. The flange on the partition plate is inserted in the opening in the heat exchanger unit and expanded radially outward with respect to the central longitudinal axis of the openings by a multiple jaw expander mechanism which is inserted through the opening in the plate into the interior of the heat exchanger. A second expander apparatus is inserted in the opening after withdrawal of the first expander to engage and expand portions of the flanges which were not fully displaced by the first expander. The expander mechanisms include radially and axially movable jaws comprising plural oval shaped jaw segments which are engaged by an axially movable mandrel.

Abstract: A heat exchanger unit having opposed pan shaped sections with perimeter flanges which are folded one over the other to secure the sections together. The section having the inner flange is formed with a displaced flange portion or bead all along the perimeter flange portions, which bead is elastically displaced by the folded over flange to form a substantially leakproof joint.

Abstract: A cabinet for air conditioning or heat pump equipment is provided with resilient coil guards which can be flexed into and out of engagement with corner posts and struts that lend rigidity to the guards and are structural integrating members of the cabinet.

Abstract: The sides of a heat exchanger unit are joined with perimeter flanges which are folded one over the other and then crimped tightly in such fashion as to cause adjacent portions of the perimeter to extend at different angles in different planes resulting in a scissor action therebetween effective to securely clamp the heat exchanger sides together and form a leak-proof chamber.

Abstract: A top cover, motor, fan and fan shroud for an air conditioning unit are assembled into an integrated structure with motor supporting legs which attach to the top cover and cause the shroud to be drawn against the cover. The legs connect with the shroud in a manner serving to preserve the concentricity of the shroud, and attach to the inside of a band which can be tightened to assure containment of the motor in a defined position under the shroud and vented portion of the cover.

Abstract: The sides of a heat exchanger unit are joined with perimeter flanges which are folded one over the other and then crimped tightly in such fashion as to cause adjacent portions of the perimeter to extend at different angles in different planes resulting in a scissor action therebetween effective to securely clamp the heat exchanger sides together and form a leak-proof chamber.

Abstract: An enclosed cart for storing and transporting refuse or other bulky materials has an enclosing lid which overlies the opening to the container, preventing the undesirable entrance of rain or extraneous debris. The cart has a small central hole in the floor panel which allows water to drain from the interior. The cart has wheels at one edge and a handle at the other whereby it may be lifted and moved easily from place to place. The interior of the cart is adapted to enclose cans or bags. Special bag holders fit into the interior of the cart and cooperate with the upper edge of the cart to hold bags. The bag holders may be single or plural whereby one or more bags may be held. The bag holders hold the tops of the bags open and prevent the tops of the bags from being drawn into the interior of the cart under the weight of added material. The bag holders are formed of sheet metal stampings or fabricated from bent wire.