QUICK-INSTALL IRRADIATION UNIT AMD METHOD OF MAKING SAME
TECHNICAL FIELD
The pre'sent invention relates to irradiation devices for controlling airborne micro-organisms and, in particular, to a quick-install germicidal irradiation unit for destroying micro-organisms collected on a surface irradiated by the unit.
BACKGROUND OF THE INVENTION
The airborne transmission of disease organisms, especially respiratory disease organisms, has long been recognized as a serious problem. Health care authorities and biologists have now become acutely aware of the problem due to the evolution of antibiotic resistant strains of streptococcus and tuberculosis, for example. It is well known that many diseaeea caused by both bacteria and viruses are primarily transmitted from hoat t.o host by air currents.. Therefore, germicidal air filters have been invented and have proven to be effective in removing micro-organisms from the air and destroying them. Examples of such filters are described in United States Patent No. 5,33 0,722 which issued "on July 19, 1994 to Pick, and has subsequently been assigned to the applicant. The germicidal air filtration systems described in that patent are principally suitable for permanent or semi-permanent installations.

As another example, a portable germicidal air filter is described in United States Patent No. 5,837,207, which issued on November 17, 1998 to Summers and also assigned to the applicant. The light weight portable germicidal air filter for home and personal use described in that patent includes a cabinet that houses an electrostatic air filter, an ultraviolet lamp and a parabolic reflector or a convex lens for focusing the ultraviolet radiation emitted by the lamp on an upstream side of the air filter. The reflector or.the lamp with the lens is constantly oscillated to systematically sweep the upstream side of the filter with-germicidal levels, of radiation. A fan adjacent the downstream side of the filter draws air through the filter and impels it out through air outlets in the side walls of the cabinet.
It - is also known to install stationary unshielded ultraviolet lamps in air ducts of commercial and domestic heating systems, . as taught, for example, in United States Patent No. 5,894,130, which issued to Bach on August 13, 1999. Such devices are installed downatream of air filters on the theory that short, high-intensity exposure to ultraviolet light as air is drawn past the ultraviolet lamps will destroy at least a proportion of the micro-organisms suspended in the air. A principal disadvantage of such systems is that the unshielded lamps readily collect airborne dust, which rapidly reduces their effectiveness, A- further disadvantage is that as velocity of air flow changes due to various operating stages of the air handling system,

the efficacy of the treatment changes. Another disadvantage is that areas known to support the reproduction of micro-organisms, such as air filters and air conditioning coils are untreated.
Air handling systems without germicidal radiation are still widely used in many applications. For example, moat domestic forced-air heating systems have a filter pad installed in the return air, path, to remove suspended particulate matter from the air. Microorganisms on the particulate matter collected on the filter pad are net destroyed and may, in fact, reproduce. A proportion of the particulate matter collected on the filter pad is re-suspended in. air when the filter pad is replaced, releasing the micro-organisme again. Studies have also shown that the filter pads are not the only place that supports the growth and reproduction of micro-organisms. A warm and moist environment such as air conditioning and refrigerator coils and ducts surrounding such coils are known to- provide a suitable environment for many types of micro-organisms, including fungus and mold.
Therefore, there exists a need for a quick-install irradiation unit adapted to be conveniently installed in proximity to a surface that collects or supports growth of micro-organisms, to expose that surface to germicidal levels of radiation.

OBJECTS OF THE INVENTION
It is an object of the invention to provide a quick-install irradiation unit for irradiating a surface.
It is another object of the invention to provide a quick-install irradiation unit that is adapted to be quickly and conveniently installed in proximity to a surface to be irradiated, regardless of an installed orientation of the unit.
It is a further object of the invention to provide a quick-install irradiation unit that is simple to construct, inexpensive to manufacture and easy to install.
It is a further object of the invention to provide a quick-install irradiation unit that is completely self-contained and requires only a power outlet to be operational once it is installed.
It is another object of the invention to provide a quick-install irradiation unit that is light-weight and easily handled, but is adapted to effectively irradiate a large area with germicidal levels of radiation, relative to its size.
It is yet a further object of the invention- to provide a quick-install irradiation unit that ie easily
serviced.

SUMMARY OF THE INVENTION
These and other objects of the invention are realized in a quick-install irradiation unit (10) for irradiating a surface, the quick-install irradiation unit comprising a frame (14) for supporting a radiation source (26) , the frame being configured to be mountable at only one end thereof and a mounting bracket (18) for receiving the one end of the frame for mounting the frame to a surface of a support structure placed in proximity of .the surface to be irradiated, CHARACTERIZED by:
the mounting bracket (18) is box-shaped and has an open top end and mounting flanges (96) that extend from at least two opposed side walls (36) for mounting the mounting bracket to the flat surface;
the frame structure has a housing (16) at one end with the frame (14) supported by the housing, the frame supporting a reflector (28) for focusing radiation emitted by the radiation source so that the radiation source mounted to the frame is supported in proximity to a surface to be irradiated, and radiation emitted by the radiation source is focused on the surface by the reflector, and the frame is further adapted to support an elongated ultraviolet lamp (26) in front of the reflector, the housing being sized to be closely received in the open top end of the mounting bracket; and

a mechanism (90,92) for interlocking the mounting bracket and the housing so that the housing is retained in the mounting bracket when the mechanism is in a .locked position, regardless of an orientation of the mounting bracket.
If the reflector for focusing the ultraviolet
radiation emitted by the ultraviolet lamp focuses the
radiation in a narrow, concentrated band, it is supported
on opposite ends of the elongated frame, and rotatable
about the lamp so that a predefined area of the surface
to be irradiated is exposed . to the focused ultraviolet
radiation at any .

given time. The reflector is oscillated by a motor supported' within the housing and operatively connected to the reflector for focusing, so that the surface is systematically exposed to radiation.
The focusing of the ultraviolet radiation is accomplished by the reflector positioned behind the ultraviolet lamp. The reflector is shaped to focus the radiation emitted by the radiation source on a predetermined area. If the reflector is mounted in a stationary position, the reflector is shaped to focus the radiation on the entire area. If, however, the reflector is rotatably mounted, it is preferably shaped to focus the radiation in a narrow, concentrated band on the surface to be irradiated. Alternatively, the radiation may be focused by a reflector behind the lamp in combination with an elongated lens positioned in front of the lamp, so that substantially all of the ultraviolet radiation emitted by the ultraviolet source is focused in a relatively narrow, elongated band on the surface to be irradiated. The means for focusing the radiation, e.g. the reflector or elongated lens, may be oscillated about an axis parallel to the axis of the lamp by an electric motor, for example, which.drives a cam shaft assembly at a predefined rate to effect the desired irradiation of the surface.
The geruticidal irradiation unit in accordance with the invention includes very few components and the

components are light in weight, and the unit is equipped with a separable mounting bracket. The germicidal irradiation unit is therefore easily handled, and may be quickly and conveniently installed, for example," in an air filter or a heating system to irradiate a filter pad, or any other supporting structures in a desired orientation and proximity to a surface to be irradiated.
The invention further provides a method of making a quick-install irradiation unit (10) mountable to a flat surface (124, 12 S) in any orientation, comprising steps of:
a) constructing a box-shaped mounting bracket {18}
having an open top end and mounting flanges (96) that
extend from at least two opposed side walla (36) for
mounting the mounting bracket to the flat surface;
b) constructing an elongated aupport frame structure
having a houeing (16) at one end and a frame (14)
supported by the housing, the frame supporting a
reflector (28) and adapted to support an elongated
ultraviolet lamp (26) in front of the reflector, the
housing being sized to be closely received in the open
top end of the mounting bracket; and
c) 'constructing a mechanism (90,92) for interlocking
the mounting bracket and the housing so that the housing
is retained in the mounting bracket when the mechanism is
in a locked position, regardless of an orientation of the
mounting bracket.

3R.TEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Further features and advantages of the present invention will become apparent from the following detailed description, taken in combination with the appended drawings, ir. which:
Fig. 1 is a "front elevatior.al view cf a preferred embodiment of the invention, with front walls of a mounting bracket and housing removed to illustrate components contained in the housing;
Fig. 2 is a aide elevational view of the embodiment shown in Fig. 1, with side wall p of the mounting bracket and the housing removed to illustrate componontc'contained in the housing;
Fig. 3 is a perspective view of the embodiment shown in Fig. 1, illustrating a condition in which the housing is withdrawn from the mounting bracket;
Fig. 4 is a perspective view of the embodiment shown in Fig. 1, illustrating a condition in which the housing is received in the mounting bracket and locked in place;
Fig. 5 is a top plan view of the embodiment shown in Fig. 1, with a top plate of the housing removed to illustrate components contained in the housing;
Fig. 6 is a achematic view showing an alternate arrangement for focusing the ultraviolet radiation in which a lens and reflector combination focus the radiation on a surface;

Fig. 7 is a wiring diagram suitable for a germicidal irradiation unit in accordance with the invention; and
Fig, 8 is a perspective view showing an application of the invention in which the embodiment shown in Fig. 1 is installed in a vertical position in an air duct for irradiating an air filter pad inserted in the duct.
It will be noted that throughout the appended drawings, like features are identified -by like reference numerals,
DETAILED DESCRIPTION OF THE PRSFERRED EMBODIMENT
Figs. 1 through 4 illustrate a preferred embodiment of a quick-install irradiation • unit in accordance with the invention, which is generally indicated by reference numeral 10. The irradiation unit 10 includes a support structure 12 .that includes an elongated frame 14 and a rectangular housing 16 secured to one end of the frame 14, A mounting bracket 18 is adapted to be mounted to a flat surface, such as a side of a heating or cooling duct, furnace, air conditioner, or other air handling equipment (not shown}' The

mounting bracket is conveniently rectangular and removably receives the housing 16 to permit a quick and convenient installation of the irradiation -unit 10 to the flat surface. The elongated frame 14 is constructed using sheet metal, for example.
As more clearly shown in Fig, 5, the frame 14 includes a back plate 20 and two aide plates 22 and 24. The back plate 20 and side plates 22, 24 define a channel with an open- front that surrounds and supports an elongated ultraviolet (UV) lamp 26, which may be a germicidal "lamp, or a germicidal and ozone producing hybrid UV lamp, both of which are commercially available. An elongated reflector 28 is also supported by the frame .14 to reflect and focus radiation emitted from the lamp towards the open front of the frame 14. One end of the frame 14 is attached to the housing 16, and the other end of the frame .14 terminates in an end plate 3 0 (Fig. 2) to increase rigidity of the frame structure. " As shown in Fig. 1, the housing 16 is a closed box structure with a top plate 32, a bottom plate 34, aide walls 36, front wall 3 6 and back wall 40 (Fig. 2) . The one end of the frame 14 is secured to the bottom plate 34 of the housing 15 in a perpendicular relation by spot welding, or any known mechanical fastener. An opening 42 (see Fig, 5) in the bottom plate 34 of the housing, Is preferably sized and shaped to provide full acceas from the inside of the housing to the channel defined by the frame 14.

The ultraviolet lamp 26 is supported at opposite ends by a pair of lamp support members 44, the longitudinal axes of the lamp 25 and the frame 14 being parallel. Each lamp support member 44 is secured . to support brackets 45,48 (see Fig. 2) which are secured to opposite ends of the back plate 2 0 of the frame 14. The support bracket 4 8 extends through the opening 42 into the housing 16 to provide a apace between its remote end and the one end of the ultraviolet ' lamp 26 for a lamp socket 50, which provides a wiring connection to the ultraviolet lamp 26 for conducting electric current to energize the lamp. The lamp 2 6 and lamp aocket 50 are preferably selected from a type in which one socket provides a full wiring connection to the lamp 2$ at only one end thereof so that no wiring is required at the other end of the lamp 26. A. dual socket lamp may also be used, however, in which case the electric conductors are routed behind the reflector 28. The wiring extends through and is supported by the bracket 48. Link arms 52 connect each end of the elongated reflector with respective tie plates 54,56. The tie plates 54 and 56 may be fixedly or rotatably mounted on the respective support brackets 46 and 48, depending on a shape of the reflector 28. The reflector 28 focuses the radiation emitted by the ultraviolet lamp 26," and also protects the lamp 26 from dust contamination by acting as an air foil that creates a alight vacuum around the lamp 26 to inhibit the collection of dust particles on the lamp.
If the reflector focuses the radiation over a wide, predefined area to be irradiated, the reflector is

fixedly mounted to the frame. If, however, the reflector focuses the radiation in a narrow, concentrated band, the reflector is rotatably mounted to the frame 00 that the reflector 28 is rotatable about the longitudinal axis of the ultraviolet lamp 26. Thus, the radiation emitted by the lamp 26 and focused by the reflector 28 in a narrow, concentrated band is systematically swept over the predefined area as the reflector 28 is oscillated about a rear aide of the ultraviolet lamp 26. The reflector 26 may be made from an aluminum alloy having a bright poliahed side to enhance reflection. Such sheet metal is available, for example, from Ideal Metal in Toronto, Canada 'and is identified as Aluminum Bright (110 0-H24). The sheet metal is typically rolled into the desired shape using techniques well known in the art. Alternatively, the reflector may be molded from a plastic , or powdered metal composition or extruded using a thermoplastic, for example. An inner surface of the reflector is then coated with a highly reflective coating, well known in the art. If the reflector 28 is shaped to focus the radiation in a narrow, concentrated band, the focal length of the reflector 26 is preferably such that " the radiation emitted by the ultraviolet lamp 26 is most concentrated when the radiation is focused at the edgea of the predefined area, so that the germicidal affect on the area is as consistent as possible,
If the reflector 2 8 is rotatably mounted to the frame 14, oscillation of the reflector 28 is preferably accomplished, by a ■ 24 volt twin coil gear reduction

motor 58, well known in the art. The motor 58 drives a fly wheel 60 of a cam shaft assembly. The fly wheel SO in turn moves an arm S2 of the cam shaft assembly which is connected to the tie plate 56 to oscillate the reflector 28. A similar structure for oscillating the reflector, which sweeps focused radiation over a predefined area is described in. Applicant's United States Patent No. 5,837,207.
The gear reduction motor 58 is mounted to the inner side of the top plate 32 of the . housing 16 by-fasteners (not shown.) inserted through mounting bores 64 (see Fig. 5) . The top plate 32 of the housing is detachably secured to the aide walla 36 and the front and back walls 38, 40 by any well known mechanical means. The housing 16 also provides a base structure and room to support and contain other components therein. A ballast 66 and a terminal block 68 are affixed on the bottom plate 34 of the housing. A switch 70, indication lamp. 72 and a .fuse 74 with a protective bracket 76 are mounted to the top plate 32 of the housing. A power cord 78 with a three prong power plug 80 is attached to the top plate 32 of the housing and wired to the electric components. The function of those components and the wiring thereof will be described with reference to Fig. 7.
The mounting bracket 18 is separable from the housing 16 as shown in Pig. 3. The mounting bracket 18 includes a front wall 82, a back wall 84, side walls 86 with a bottom plate 88, which only partially closes the

bottom of the mounting bracket 18 to permit the elongated frame 14 to extend through the mounting bracket 18. The mounting bracket IS is a rectangular box structure sized and shaped to receive the housing 16 therein and securely retain the elongated 'frame 14- in any orientation. The . elongated frame 14 is locked in the mounting bracket 16 to ensure that the quick-install irradiation unit 10 can be mounted to a flat surface in any orientation. Any member of locking mechanisms can be used, including screw fasteners (not shown) , for example. By way of example, a quick-release latch mechanism is illustrated and described. It should be understood, however, that other types of locking mechanisms have been contemplated and designed. The quick-release latch mechanism includes a latch member 90 pivot ally mounted on the external side of the top' plate 32 of the housing 16 to slide under a head of a locking pin 32, as shown in Fig. 4. The locking pin 92 is secured to the bottom plate 88 of the mounting bracket 18 and extends through openings 94 defined in the respective bottom plate 34 and top plate 32 of the housing IS (only one opening in the top plate 32 is shown in Fig. 3) when the housing 16 is received within the mounting bracket 18. The mounting bracket 18 includes two flanges 9S that extend outwardly from the bottom edge of the respective side walls 86 of the moionting bracket 18 .
It is therefore convenient to mount the mounting bracket 18, when separated from the support structure 12, to a flat support surface in a desired position. When the elongated frame 14 extends through

the mounting bracket 18 and the housing 16 is received in the mounting bracket 18, the elongated .frame 14 is supported in proximity to a surface to be irradiated. The predefined area over which the focused radiation is directed by the unit should be coincident with the surface to be irradiated, so that the surface is exposed to germicidal levels of radiation. The lock mechanism, such as latch member 90 and the locking pin 92, ensures that the housing 16 is securely seated in the mounting bracket 18 and the elongated frame 14 is supported in its position with respect to the surface to be irradiated, regardless of the orientation of the irradiation unit 10 connected to the external structure, A handle '93 is provided on the top plate 32 of the housing 16 so that it is convenient to handle and carry the germicidal irradiation unit. An example of an application of the invention will be further described below with reference to the drawing of Fig. 8.
Fig, 6 Illustrates an alternate arrangement for focusing the ultraviolet radiation emitted by the ultraviolet lamp 26. In this embodiment,, the reflector. 98 reflects ultraviolet radiation onto a convex lens 100 which focuses the ultraviolet radiation in much the same way as a focused reflector 28 described above, The lens 100 • may be - made fromr for " example, a uV resistant and transmissive acrylate or Teflon plastic, quartz or a UV transmissive glass used In the manufacture of UV lamps. The lens 100 is preferably configured to have a focal length such that the radiation emitted by the ultraviolet lamp 26 is most concentrated when the

radiation is-focused at the edges of the predefined area. The lens 100 also further protects the ultraviolet lamp 2 6 from exposure to dust particles suspended in the air.
Fig. 7 is a wiring diagram suitable for wiring the guick-inatall irradiation unit 10 in accordance with. the invention- The three prong power plug BO is connected to the power cord 7 8, which typically supplies 12 0 VAC input current. A ground conductor 102 of the power cord 78 is connected to ground through the terminal block 68. A power conductor 104 of the power cord 78 connected through the terminal 68 is interrupted by the fuse 74 and the switch 70, and terminated at one of the connecting points 106 of the terminal block 68, which points are interconnected together to serve as a high voltage end in the circuit when the switch 70 is in an "on" position. A conductor 108 of the power cord 78 is connected to the connecting points 110 of the. terminal block 68, which serve as a low voltage end in the" circuit-. The gear reduction motor 56 is connected through the conductor 104a to the high voltage end connecting points 106 on the terminal block 68, and connected through the conductor 108a. to the low voltage end connecting points 110 on the terminal block 68. The-gear reduction motor is thus energized by electric current when the switch 70 is on.1 Similarly, conductors 104b and 108b interconnect the ballast 34 and the respective connecting points 106 and 110 to supply 120 volt AC input to the ballast 34, which is connected to the lamp socket 50 by conductors 112a, 112b, 112c and

112d. The ballast 34 transforms the 120 volt AC input to a voltage output suitable for driving- the ultraviolet lamp 26 The indication lamp 72 ia also connected through conductors 104c and 108c to the respective high voltage end connecting points 106 and low voltage end connecting points 110 so that the indication lamp is illuminated to indicate an operation condition of the unit when the switch 70 is on and the fuse 74 works properly. A colouring system is indicated in Fig, 7 in which the black indicates the wiring with the high voltage end, the white with the low voltage end, and the green for ground. Yellow, red and blue colours are used to identify the wiring to the socket 50.
The quick-install irradiation, unit 10 can be easily and conveniently installed to" a support structure in proximity of a surface to be irradiated. For example, the unit can be quickly installed in an air duct, attached, to an air conditioning or refrigeration unit to irradiate the coile where growth of micro-organisms is supported. An example of auch an application of the invention is shown in Fig. 8. An air duct 12 0 is typically used In a forced-air heating system. An electrostatic air filter 118 may be inserted through a slot 122 in a side wall 124 of the air duct 12 0 to remove particulate matter suspended in the air when the air is drawn through the air duct 120. Micro-organisms are collected with the particulate matter on the upstream side of the filter pad 118. It is convenient to install the germicidal irradiation unit 10 described above in the air , duct 120 to expose the upstream side of the

electrostatic air filter 118 to germicidal levels of radiation. The installation begins by cutting an aperture ,in a top wall 126 of the air duct 120, shaped and sized to permit the elongated frame 14 to be inserted down. through- the aperture into the air duct 120 The next step is to mount the mounting bracket 18 on the external side of the top wall 126, using fasteners to attach the flanges 96 to the top wall 126. The open portion of the bottom of the mounting bracket 18 is aligned with the aperture made in the top wall 125- The elongated frame 14 is inserted through, the aperture in the top wall 126 into the air' duct 120 until the housing 16 is seated in the mounting bracket 18. The latch member 90 ia then rotated to slide under the head of the locking pin 92 to secure the unit in place.
The position of the aperture made in the top wall 126 of the air" duct 12 0 should be carefully determined so that when the germicidal irradiation unit is installed, the elongated frame 14 is located in proximity to the upstream side of the filter pad 118« More' especially, the distance * between the ultraviolet lamp 26 of the unit and the upstream side of the filter pad 110 is determined so that the focused radiation emitted from the ultraviolet lamp 26 is focused on an entire area of the upstream side of the electrostatic air filter 115- If an oscillating reflector is used, the quick-install irradiation unit 10' should be positioned so, that radiation ia roost concentrated when 'the radiation is focused at the edges of the upstream side of the electrostatic air filter 18.

The application for the invention described with reference to Fig. 8 is exemplary onlyr and the germicidal irradiation unit in accordance with the invention may be mounted to any suitable structure for irradiating a surface which benefits from irradiation.
The embodiment{s}' of the invention described above is (are) intended to be exemplary only. The scope of the invention is therefore intended to be limited solely by the scope of the appended claims,
INDUSTRIAL APPLICABLITY
The invention provides a quick-Install germlcidal irradiation unit that can be used in original equipment, as well as retrofit applications,, where it is, important or beneficial to treat air circulated by an air handling system to destroy airborne germs, such as bacterial or fungal spores, viruses, or bacteria trapped on a surface of a filter medium, or the like. With the current propagation rate of antibiotic-resistant strains of disease organisms the rapid and effective destruction of disease organisms in circulated air is increasingly critical. The invention provides an apparatus adapted to

be manufactured at reasonable cost and quickly installed to facilitate the destruction of aixborne disease organisms. The apparatus can generally be used to irradiate any area in an air handling system where airborne organisms are . likely to accumulate. Refrigeration coils used in air conditioning systems, air filter pads, and precipitator plates are examples of areas in air handling systems that benefit from irradiation.

CLAIMS:
1. A quick-install irradiation unit (10) for irradiating a surface, the quick-install irradiation unit comprising a frame (14) for supporting a radiation source (26), the frame being configured to be mountable at only one end thereof and a mounting bracket (18) for receiving the one end of the frame for mounting the frame to a surface of a support structure placed in proximity of the surface to be irradiated, CHARACTERIZED by:
the mounting bracket (18) is box-shaped and has an open top end and mounting flanges (96) that extend from at least two opposed side walls (36) for mounting the mounting bracket to the flat surface;
the frame structure has a housing (16) at one end with the frame (14) supported by the housing, the frame supporting a reflector (28) for focusing radiation emitted by the radiation source so that the radiation source mounted to the frame is supported in proximity to a surface to be irradiated, and radiation emitted by the radiation source is focused on the surface by the reflector, and the frame is further adapted to support an elongated ultraviolet lamp (26) in front of the reflector, the housing being sized to be closely received in th.e open top end of the mounting bracket; and

a mechanism (90,92) for interlocking the mounting bracket and the housing so that the housing is retained in the mounting bracket when the mechanism is in a locked position, regardless of an orientation of the mounting bracket.
2. A quick-install irradiation unit as claimed in
claim 1 wherein the radiation source (26) is
supported between respective ends of the
frame (14), and the reflector (28) for focusing the
radiation is supported between respective ends of
the frame and reciprocally moveable about the
radiation source relative to the frame, so that the
radiation is focused in a narrow band that is
systematically swept over the surface to expose the
surface to radiation.
3. A quick-install irradiation unit as claimed in
claim 2 wherein the reflector (28) for focusing is
reciprocally moved by a gear reduction motor (58)
and a cam shaft assembly (60,62) supported by the
housing (16) and operatively connected to the
means (28) for focusing.
4. A quick-install irradiation unit as claimed in any
preceding claim wherein the quick-install
irradiation unit (10) further comprises an
elongated lens (100).
5. A quick-install irradiation unit as claimed in
claim 1 wherein the ultraviolet lamp is a
germicidal/ozone producing lamp.

6. A quick-install irradiation unit as claimed in any-
preceding claim wherein the ultraviolet radiation
source (2 6) comprises an elongated ultraviolet lamp
wired only at one end thereof to an electric power
source that is supported on the one end of the
frame (14) secured to the housing (16)-
7. A method of making a quick-install irradiation
unit (10) mountable to a flat surface (124, 126) in
any orientation, comprising steps of:

a) constructing a box-shaped mounting bracket (13)
having an open top end and mounting
flanges (96) that extend from at least two
opposed side walls (36) for mounting the
mounting bracket to the flat surface;
b) constructing an elongated support frame
structure having a housing (16) at one end and
a frame (14) supported by the housing, the
frame supporting a reflector (28) and adapted
to .support an elongated ultraviolet lamp (2 6)
in front of the reflector, the housing being
sized to be closely received in the open top
end of the mounting bracket; and
c) constructing a mechanism (90,92) for
interlocking the mounting bracket and the
housing so that the housing is retained in the
mounting bracket when the mechanism is in a
locked position, regardless of an orientation
of the mounting bracket.

8. A method as claimed in claim 7 wherein step c)
comprises steps of: securing a locking pin (90) to
a bottom plate of the mounting bracket (18) ;
forming aligned openings in the housing (16) to
receive the locking pin; and, securing a latch
member (92) to a pivotal mount on an external side
of a top plate (32) of the housing, so that the
latch member can be rotated to slide under a head
of the locking pin.
9. A method as claimed in claims 7 or 8 further
comprising a step of mounting the reflector (28) to
support brackets (46,48) that permit the reflector
to be oscillated around a rear . side of the
ultraviolet lamp (28) and connecting a motor (58)
to a one of the support brackets to oscillate the
reflector.

A quick-install irradiation unit (10) for irradiating a surface includes a mounling brackel (18) that accepts a housing (16) connected to a frame (14) for supporting un ultraviolet lamp (26), with a reflector (28) or a lens (100) for focusing the radiation on the surface. The housing secured to one end of the frame contains a drive motor (58) and a cam assembly (60,62), which oscillaic the reflector; so that the radiation is focused on a predefined area of the surface at any givan time. The unil can be quickly installed in any orientation on practically any flat surface (124, 126).