Author: claimsbot

1. A bed frame assembly comprising:
a pair of parallel spaced apart side rails, each of the side rails constructed of a T-shaped cross section forming a vertical flange having upper and lower edges and an outer surface facing outwardly of the bed frame and an inner surface, a horizontal flange extending inwardly from said inner surface of each of said side rails about midway between the upper and lower edges of the vertical flange, and cross rails which extend generally perpendicularly between the side rails and having opposed ends affixed to the side rails, a leg assembly extending to the floor located at or proximate to each opposed end of the cross rails, each leg assembly comprising a main body having a front wall and a side wall, the front wall of each leg assembly affixed to a cross rail and the side wall of each leg assembly affixed to a side rail.
2. The bed frame assembly as defined in claim 1 wherein said leg assembly includes a pivot bracket extending from the side wall and having a hole formed therein, said side rail having a side rail bracket affixed to the inner surface of said side rail and having a hole formed therein, wherein said pivot bracket and said side rail bracket have coplanar portions aligning said holes and said horizontal flange of said side rail has a hole, and a pin passing through the hole in said side rail, the hole in said rail bracket and the hole in said pivot bracket to join said side wall of said leg assembly to said side rail.
3. The bed frame assembly as defined in claim 2 wherein said main body of said leg assembly further includes a caster flange having a hole for affixing a caster to said leg assembly.
4. The bed frame of claim 1 in which the leg assemblies are concealed by the vertical flange of the side rail.
5. The bed frame of claim 2 wherein the pivot bracket of the leg assembly protrudes from the side wall of the leg assembly at a distance below the point at which the leg assembly is affixed to the cross rail.
6. The bed frame of claim 1 wherein said cross rails have a horizontal flange and said horizontal flange of said cross rails is in the same plane as the horizontal flange of the side rails.
7. The bed frame of claim 1 wherein the affixation of the side rail and the cross rail is substantially above and in line with the pivotal attachment of the pivot bracket on the leg assembly and the side rail bracket on the vertical flange of the side rail.
8. The bed frame of claim 1 in which the generally uniform T-shape cross section of said side rails is constructed by a joining of two angle iron beams each having an L-shaped cross-section with a horizontal and a vertical flange.
9. The bed frame of claim 1 further comprising a center rail which extends between the cross rails, and wherein each of the ends of the center rail are affixed to the cross rails at a point generally mid way between the side rails.
10. The bed frame of claim 2 wherein the vertical flange of at least one of the side rails conceals the junction of the pivot bracket and side rail bracket.
11. The bed frame of claim 2 wherein at least one of the pivot brackets is a separate part attached to the leg assembly.
12. The bed frame of claim 1 wherein each of said side rails have a headboard end adapted to be affixed to a headboard, a headboard bracket affixed to said headboard end, said headboard bracket being affixed to said headboard end by at least two securing devices that are vertically spaced apart.
13. The bed frame of claim 12 wherein one of the at least two securing devices is located above said horizontal flange of said side rail and another of said at least two securing devices is located below said horizontal flange of said side rail.
14. The bed frame of claim 12 wherein said at least two securing devices comprise rivets.
15. The bed frame of claim 12 wherein said headboard bracket comprises a hook bracket having hooks extending outwardly therefrom to connect with pins located on a headboard.
16. The bed frame of claim 12 wherein said headboard bracket comprises a headboard bracket having a flat, planar surface having elongated holes formed therein to allow the affixation of the headboard bracket to a headboard.
17. A system for stabilizing a bed frame leg affixed to a side rail and a cross member utilizing:
a side rail having a uniform T-shape cross section having a horizontal flange and a vertical flange, a side rail bracket affixed to said vertical flange and aligned but vertically separated by a finite distance from a hole in the horizontal flange of said side rail,
a support leg having a pivot bracket extending therefrom, said support leg being affixed to the cross member where the cross member and the pivot bracket each have two holes aligned but separated by a finite distance,
said two holes of the cross member and the two holes of the pivot bracket being intersected by at least one pivoting pin to forming a hinged section that allows for the free movement of the cross member and bed frame leg with respect to the side rail.
18. The bed frame leg system mechanism of claim 17 wherein the at least one pivoting pin comprises at least one rivet.
19. The bed frame leg system mechanism of claim 17 wherein the pivot bracket extending from the support leg is a separate part.
20. The bed frame leg system mechanism of claim 17 wherein the side rails are metal components.
21. The bed frame leg system mechanism of claim 17 wherein the sharp exposed edges of the side rail are cover by molded plastic components.
22. A bed frame having two spaced apart metal side rails that are unitary with a generally T-shaped cross section and having opposed ends, each side rail having a first generally horizontal flange and a second generally vertical flange, said first generally horizontal flange adapted to support a bedding foundation and two spaced apart transverse rails having opposed ends, the transverse rails being generally perpendicular to the side rails, said ends of the transverse rails positioned proximate to the side rails.
23. The bed frame of claim 22 wherein said bed frame further includes a mounting bracket mounted to said second flange near the opposed ends of the side rails, the mounting bracket configured to engage the leg assembly at a point spaced from the connections between the leg assembly and the side rails.
24. A generally rectangular bed frame comprising side rail members interconnected by two or more hinging connections at each corner of the generally rectangular bed frame, leg assemblies having casters attached thereto supporting the bed frame, the side rail members being formed in a uniform T-shaped cross section having a vertical flange connected to a horizontal flange at a position near midway on the vertical flange forming a side rail resistant to twisting and bowing when a load is applied to the horizontal flange.
25. The bed frame of claim 24 wherein the side rails are constructed of metal.
26. The bed frame of claim 24 wherein each side rail is constructed of two opposing angle iron beams.
27. The bed frame of claim 24 wherein the vertical flange of the side rail is covered by molded plastic cover components.
28. The bed frame of claim 24 wherein the side rails have sharp exposed edges that are covered by decorative molded plastic components.
29. A bed frame comprising a pair of side rails of a T-shaped cross section forming a vertical flange having upper and lower edges and an outer surface facing outwardly of the bed frame and an inner surface, a horizontal flange extending inwardly from said inner surface of each of said side rails about midway between the upper and lower edges of the vertical flange, a light producing means affixed to the side rails and located along the inner surface of the vertical flange and underneath the horizontal flange.
30. A bed frame as defined in claim 29 when said light producing means is a fluorescent lamp.
31. A bed frame as described in claim 1 further including a headboard bracket affixed to each of said side rails, wherein the headboard bracket attaches to the vertical flange of the side rails at one location above the horizontal flange and at another location below the horizontal flange.
32. A bed frame headboard bracket affixed to an end of a T-shaped side rail having a vertical flange having upper and lower edges and a horizontal flange extending from said vertical flange about midway between the upper and lower edges of the vertical flange thereby separating said vertical flange into an upper and lower portion, said bracket being affixed to said vertical flange of said side rail at one location along said upper portion and at another location along said lower portion of said vertical flange.
33. A bed frame headboard bracket as defined in claim 32 wherein said bracket has a forward face having a plurality of horizontal slots for bolting a headboard to said bracket.
34. A bed frame headboard bracket as defined in claim 32 wherein said bracket has a forward end having hooks for inter-fitting with pins in a headboard and footboard.
35. A bed frame headboard bracket as defined in claim 33 wherein said bracket is affixed in said one and another location by mean of rivets.
36. A bed frame headboard bracket as defined in claim 32 wherein said bracket has an offset step to increase the attachment widths of a headboard.
37. A bed frame headboard bracket as defined in claim 32 wherein said bracket is one piece and interchangeable side to side or end to end.
38. A bed frame assembly comprising:
a pair of parallel rail members interconnected to form a generally rectangular frame structure, each of said rail members having a uniform generally T-shape cross-section with a vertical flange and a horizontal flange extending from the general mid point of the vertical flange inward toward the center of the frame assembly for supporting a mattress and box spring, a first leg member extending downward and inward forming a generally four sided tapering receiver mechanically attached to both the horizontal and vertical flange,
opposed cross rails extending generally perpendicularly between the side rails, a second leg member extending to the floor affixed proximate to an end of the cross rails, each second leg member having a main body, a front wall, a side wall, and a caster flange for affixing a caster to said second leg member, the front wall of each second leg member being fastened to a cross rail, and the side wall formed in a general downward wedge shape and being adapted to telescopically engage with said first leg member forming a complete leg assembly resistant to collapse based on the close proximity of the connection of the first leg member to the side rail and the contact with a floor forming a small lever arm to fulcrum distance and resistant to movement in any direction in the X, Y & Z axis.
39. The bed frame of claim 38 wherein the complete leg assemblies are externally concealed by the vertical flange of the side rail.
40. The bed frame of claim 38 wherein the first leg member has a general rectangular cross section and the second leg member has a general C shape cross section both of which are tapering extruded shapes that inter-fit telescopically.
41. The bed frame of claim 38 wherein a horizontal flange of the cross rails is generally in the same plane as the horizontal flange of the side rails after the first and second leg members are assembled together.
42. The bed frame of claim 38 wherein the side rail and cross rail are attached together at a point that is substantially inward of the plane formed by the vertical flange of the T-shape side rail.
43. The bed frame of claim 38 in which a side rail having a uniform generally T-shape cross section is made of two angle iron beams affixed together, each of said angle iron beams having a uniform L-shaped cross section with a horizontal and a vertical flange of approximately the same length.
44. The bed frame of claim 38 further comprising a center rail having opposed ends, said center rail extending between the cross rails, and wherein each of the opposed ends of the center rails has a second leg member, a first leg member being mechanically fastened midway between the cross rails, said first and second leg members interconnecting to form a complete leg assembly connecting the center rail to the cross rails.
45. The bed frame of claim 38 wherein at least one of the side rails has a generally T-shaped cross-section with at least one flange disposed generally vertically to provide an attachment point for the first leg assembly and act to conceal the attachment point.
46. The bed frame of claim 38 wherein at least one of the first leg members opens downward allowing the upward insertion of the second leg member.
47. A system for stabilizing a bed frame leg comprising:
a cross member, a side rail having a T shaped cross section having a flange in the x and the y axis, a downwardly tapering female leg bracket attached to the side rail along both the x and y axis of the side rail, a support leg, said support leg having a wedge shaped male leg bracket mounted to the cross member in the z axis,
the male and female leg brackets being slidably engaged with complementary angles of the taper that controls movement of the cross member and bed frame leg in relation to the side rail in the x, y and z axies.
48. The bed frame leg stabilizing mechanism of claim 47 wherein the weight of bedding acting downwardly on the side rail produces a constant force that continually presses the male and female leg brackets together resisting momentary destabilizing forces applied to the bed frame leg.
49. The bed frame leg stabilizing mechanism of claim 47 located at at least one of the connections of a bed frame where a side rail and cross rail are interconnected.
50. The bed frame leg stabilizing mechanism of claim 47 connecting a center rail of a bed frame to a set of cross rails.
51. The bed frame of claim 47 wherein the side rail is constructed of metal.
52. The bed frame of claim 47 wherein the side rail is constructed of two opposing angle iron beams.
53. The bed frame of claim 47 wherein the downward tapering female leg bracket of the side rail is cover by molded plastic cover components.
54. The bed frame of claim 47 wherein the sharp exposed edges are covered by decorative molded plastic components.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. A patellar implant comprising:
a posterior portion having an outboard face that includes an articulating surface and an inboard face that includes one of a stem and a recess, and one of an annular central hub and an annular radial pocket and one of a protrusion and a depression that extends from said annular central hub or said annular radial pocket alone said inboard face;
a ring-lock:
an anterior portion defining a tissue engaging surface and a posterior portion engaging surface, said anterior portion being formed entirely of porous metal from said tissue engaging surface to said posterior portion engaging surface, said anterior portion having the other of said stem and said recess wherein said stem, said recess and said ring-lock attain a mechanical interlock in an assembled position upon advancement of said stem into said recess, said anterior portion further having the other of said annular central hub and said annular radial pocket that extends from said annular central hub or said annular radial pocket along said inboard face, wherein complementary tapered surfaces formed on said annular central hub and said annular radial pocket, respectively, continuously surround said stem and said recess and engage each other when said annular radial pocket receives said annular central hub in said assembled position; and
wherein said mechanical interlock between said stem, recess and ring-lock, as well as engagement of said complementary tapered surfaces of said annular central hub and said annular radial pocket cooperate to resist separation of said posterior and anterior portions and wherein said protrusion and said depression mate and resist rotation of said posterior portion relative to said anterior portion in said assembled position.
2. The patellar implant of claim 1 wherein said stem is formed on said posterior portion and includes a proximal end extending from a body, an intermediate portion and a distal end, wherein a radius of said stem increases from said intermediate portion to said distal end.
3. The patellar implant of claim 2 wherein said recess is formed in said anterior portion, from said inboard surface of said anterior portion through an intermediate area to a terminal end.
4. The patellar implant of claim 2 wherein said stem is integrally formed with said posterior portion and said recess is integrally formed with said anterior portion.
5. The patellar implant of claim 3 wherein said ringlock is retained within a first annular pocket formed on said recess of said anterior portion.
6. The patellar implant of claim 5 wherein said ringlock is adapted to nest within a second annular pocket formed on said stem of said posterior portion in said assembled position.
7. The patellar implant of claim 1 wherein said protrusion comprises at least two protrusions and wherein said depression comprises at least two depressions.
8. The patellar implant of claim 7 wherein said at least two protrusions include radial outset members on one of said posterior portion and said anterior portion and wherein said at least two depressions define radial inset members on the other of said posterior portion and said anterior portion.
9. The patellar implant of claim 3 wherein said posterior portion is formed of polyethylene.
10. A patellar implant comprising:
a polyethylene portion having a uniformly convex posterior articulating surface and a first inboard surface, said first inboard surface having a first integrally formed retaining feature comprising one of a stem or recess centrally formed thereon, said first inboard surface further comprising one of an annular central hub or an annular radial pocket that surrounds said first integrally formed retaining feature and one of a protrusion or a depression that extends from said annular central hub or said annular radial pocket alone said first inboard face;
a porous metal portion having a uniformly convex anterior tissue engaging surface and a second inboard surface, said second inboard surface having a second integrally formed retaining feature comprising the other of said stem or recess centrally formed thereon and having the other of said annular central hub and said annular radial pocket, and having the other of said protrusion and said depression that extends from said annular central hub or said annular radial pocket along said second inboard face, said porous metal portion being entirely porous from said convex anterior tissue engaging surface to said second inboard surface;
a snap-ring retained within said recess and that captures said stem within said recess in an assembled position; and
wherein said first and second integrally formed retaining features cooperatively mate and said annular central hub and said annular radial pocket cooperatively mate around a continuous mating surface that surrounds and is radially offset outboard a distance from said first and second integrally formed retaining features to resist separation of said polyethylene portion and said porous metal portion in an assembled position, wherein an outer dimension of each of said annular central hub and said annular radial pocket defines a continuous tapered surface respectively, said continuous tapered surfaces cooperating to provide a mechanical interlock and wherein said protrusion and said depression mate and resist rotation of said polyethylene portion relative to said porous metal portion.
11. The patellar implant of claim 10 wherein said first integrally formed retaining feature includes said stem extending from a body of said polyethylene portion.
12. The patellar implant of claim 11 wherein said stem defines a proximal end extending from said body, an intermediate portion and a distal end, wherein a radius of said stem increases from said intermediate portion to said distal end.
13. The patellar implant of claim 12 wherein said second integrally formed retaining feature is defined by said recess formed in said porous metal portion, from an inboard surface of said porous metal portion through an intermediate area to a terminal end, wherein a radius defined by said recess increases from said intermediate area to said terminal end.
14. The patellar implant of claim 10 wherein said protrusion comprises at least two protrusions and wherein said depression comprises at least two depressions.
15. The patellar implant of claim 14 wherein said at least two protrusions define radial outset members defined on said first inboard surface of said polyethylene portion or said second inboard surface of said porous metal portion and wherein said at least two depressions define radial inset members defined on the other of said polyethylene portion and said porous metal portion.
16. The patellar implant of claim 1 wherein said annular central hub defines a radial projection that continuously surrounds said stem and recess in said assembled position.
17. The patellar implant of claim 16 wherein said annular radial pocket defines a continuous depression that is radially offset from said stem.
18. The patellar implant of claim 16 wherein said continuous tapered surfaces are formed on an outer dimension of both of said annular central hub and annular radial pocket.
19. The patellar implant of claim 11 wherein said annular central hub defines a first planar engagement surface and said annular radial pocket defines a second planar engagement surface, wherein said first and second planar engagement surfaces engage in said assembled position and wherein said first and second planar engagement surfaces are generally parallel to each other and generally transverse to an axis defined by said stem.
20. The patellar implant of claim 1 wherein said anterior portion defines suture receiving passages therethrough.
21. The patellar implant of claim 1 wherein said tissue engaging surface is an outermost surface of said anterior portion, said tissue engaging surface being uniformly convex.
22. The patellar implant of claim 21 wherein said posterior portion is uniformly convex.
23. The patellar implant of claim 10 wherein said porous metal portion defines suture receiving passages therethrough.

1. A production monitoring system (10) comprising a plurality of injection and production units (80) coupled in operation to sensors (410) for measuring physical processes occurring in operation in the injection and production units (80) and generating corresponding measurement signals (420) for computing hardware (400), wherein said computing hardware (400) is operable to execute software products (300) for processing said signals (420),
characterized in that the software products (300) are adapted for said computing hardware (400) to analyse said measurement signals (420) to abstract a parameter representation of said measurement signals (420), and to apply a temporal analysis of said parameters to identify temporally slow processes and temporally fast processes therein, and to employ information representative of said slow processes and fast processes to control a management process for controlling operation of the system (10).
2. A production monitoring system (10) as claimed in claim 1, wherein said injection and production units (80) have associated therewith production and injection rates (rA, rB), together with upper and lower borehole pressures (pU, pL) as the sensor signals (420), and the management processes is adapted to control said injection and production units (80) in respect of one or more of: production rate, operating safety, maintenance requirement.
3. A production monitoring system (10) as claimed in claim 1 or 2, wherein said temporal analysis involves applying a temporal filter (330) for analysing temporal characteristics of said measurement signals (420) by modelling said measurement signals, and determining deviations between said measurement signals (420) and corresponding modelled measurement signals for identifying said temporally fast processes.
4. A production monitoring system (10) as claimed in claim 3, wherein said temporal filter (330) employs a Kalman filter.
5. A production monitoring system (10) as claimed in claim 4, wherein the Kalman filter is formulated for Ni injectors and Np producers as expressed by Equation 1 (Eq. 1):
\uf74c
Y
j

\ue8a0

(
t
)
\uf74c
t
=
\u2211
i

\ue89e
K
ji

\xb7
Y
i

\ue8a0

(
t
)
+
\u2211
p

\ue89e
K
jp

\xb7
Y
p

\ue8a0

(
t
)
+
P
j
*

\ue8a0

(
t
)
Eq
.
\ue89e
1
wherein
K=parameters of the system (10);
Y=an output variable, measured response of the system (10);
P*=input variables to the system (10), namely pressure gradient to the system (10);
t=time; and
i,j=reference indices, and
wherein the output variable Y is defined by Equation 2 (Eq. 2) and Equation 3 (Eq. 3):
Y
j

=
\u222b
0
t

\ue89e
P

w
,
j
\ue8a0

(

t
\u2032

)
–
P
r

\ue8a0

(
0
)
\ue89e

\uf74c

t
\u2032
Eq
.
\ue89e
2
P
j
\u2032

\ue8a0

(
t
)
=
Q
j

\ue8a0

(
t
)
J
i
Eq
.
\ue89e
3
wherein Equation 4 (Eq. 4) defines a time derivative of the output variable:
\uf74c

Y
j
\uf74c
t
=
P

w
,
j
\ue8a0

(
t
)
–
P
v

\ue8a0

(
0
)
Eq
.
\ue89e
4
wherein
Jj=set of parameters associated with the system (10); and
Qj=flow rate
6. A production monitoring system (10) as claimed in any one of the preceding claims, wherein said analysis is adapted for determining interaction between the injection and production units (80) when intercepting a formation (30) which is mutually common to the injection and production units (80).
7. A production monitoring system (10) as claimed in any one of the preceding claims, wherein the injection and production units (80) include at least one of; oil andor gas wells, multiple apparatus in a production facility, continuous mining facilities, geological water extraction facilities.
8. A method of monitoring a plurality of production units (80), characterized in that said method includes:
(a) using sensors (410) coupled to the injection and production units (80) for measuring physical processes occurring in operation in the injection and production units (80) and generating corresponding measurement signals (420) for computing hardware (400), wherein said computing hardware (400) is operable to execute software products (300) for processing said signals (420);
(b) using computing hardware (400) executing said software products (300) to analyse said measurement signals (420) to abstract a parameter representation of said measurement signals (420);
(c) using said computing hardware (400) to apply a temporal analysis of said parameters to identify temporally slow processes and temporally fast processes therein; and
(d) employing information representative of said slow processes and fast processes to control a management process for controlling operation of the system (10).
9. A method as claimed in claim 8, wherein said injection and production units (80) have associated therewith injection and production rates (rA, rB), together with upper and lower borehole pressures (pU, pL) as the sensor signals (420), and the management processes is operable to control said production units (80) in respect of one or more of: production rate, operating safety, maintenance requirement.
10. A method as claimed in claim 8 or 9, wherein said temporal analysis involves applying a temporal filter (330) for analysing temporal characteristics of said measurement signals (420) by modelling said measurement signals, and determining deviations between said measurement signals (420) and corresponding modelled measurement signals for identifying said temporally fast processes.
11. A method as claimed in claim 10, wherein said temporal filter (330) employs a Kalman filter.
12. A software product (300) recorded on a machine-readable data storage medium, wherein said software product (300) is executable on computing hardware (400) for implementing a method as claimed in any one of claims 8 to 11.

The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.

1. A projector comprising:
an image projection unit which projects an image, said image projection unit having a light source;
a first casing in which said image projection unit is mounted;
a second casing combined with said first casing thereby to constitute an enclosure enclosing said image projection unit, said second casing being movable relative to said first casing, between an enlarging position where the volume of said enclosure is enlarged and a reducing position where the volume of said enclosure is reduced;
an exhaust fan mounted to said first casing, said exhaust fan rotating when said light source illuminates; and
an exhaust port formed on said second casing.
2. The projector as set forth in claim 1, further comprising a controller which permits the illumination of said light source and the rotation of said exhaust fan, when said second casing is in said enlarging position, and prohibits the illumination of said light source and the rotation of said exhaust fan, when said second casing is in said reducing position.
3. The projector as set forth in claim 1, wherein said exhaust port is opened when said second casing is in said enlarging position, and said exhaust port is closed when said second casing is in said reducing position.
4. The projector as set forth in claim 1, wherein said exhaust port is formed on at least one of a top plate and a bottom plate of said second casing.
5. The projector as set forth in claim 1, further comprising an inlet port which is opened when said second casing is in said enlarging position and which is closed when said second casing is in said reducing position.
6. The projector as set forth in claim 5, wherein said inlet port is formed on said first casing, and said second casing has an opening which overlaps with said inlet port when said second casing is in said enlarging position.
7. The projector as set forth in claim 2, wherein said controller causes said light source to start illuminating when said second casing moves to said enlarging position, and said controller causes said light source to stop illuminating when said second casing moves to said reducing position.
8. The projector as set forth in claim 2, wherein said controller turns on the main power when said second casing moves to said enlarging position, and said controller turns off said main power when said second casing moves to said reducing position.
9. The projector as set forth in claim 2, wherein said controller comprises:
a power supply circuit which supplies the power to said light source;
a switch operated by the movement of said second casing between said enlarging position and said reducing position; and
a control circuit which permits or prohibits the supply of the power from said power circuit to said light source, according to the operation of said switch.
10. The projector as set forth in claim 1, further comprising:
a lock mechanism which locks said second casing at said reducing position; and
a lock release mechanism operated by a user to release said second casing from said lock mechanism.
11. The projector as set forth in claim 10, wherein said lock mechanism comprises:
a first lock member provided on said first casing; and
a second lock member provided on said second casing, said second lock member engaging said first lock member when said second casing is in said reducing position.
12. The projector as set forth in claim 1, further comprising a spring member which pushes said second casing toward said enlarging position.
13. The projector as set forth in claim 1, further comprising:
a guide groove provided on one of said first casing and said second casings; and
a guide pin provided on the other of said first casing and said second casings, said guide pin slidably engaging said guide groove.
14. A projector comprising:
an image projection unit which projects an image, said image projection unit having a light source;
a first casing in which said image projection unit is mounted;
a second casing combined with said first casing thereby to constitute an enclosure enclosing said image projection unit, said second casing being movable relative to said first casing, between an enlarging position where the volume of said enclosure is enlarged and a reducing position where the volume of said enclosure is reduced;
an exhaust fan mounted to said second casing, the distance between said exhaust fan and said light source being longer when said second casing is in said enlarging position than when said second casing is in said reducing position; and an exhaust port formed on said second casing.
15. The projector as set forth in claim 14, further comprising a controller which permits the illumination of said light source and the rotation of said exhaust fan, when said second casing is in said enlarging position, and prohibits the illumination of said light source and the rotation of said exhaust fan, when said second casing is in said reducing position.
16. The projector as set forth in claim 14, wherein said exhaust port is opened when said second casing is in said enlarging position, and said exhaust port is closed when said second casing is in said reducing position.
17. The projector as set forth in claim 14, further comprising an inlet port which is opened when said second casing is in said enlarging position and which is closed when said second casing is in said reducing position.
18. The projector as set forth in claim 15, wherein said controller causes said light source to start illuminating when said second casing moves to said enlarging position, and said controller causes said light source to stop illuminating when said second casing moves to said reducing position.
19. The projector as set forth in claim 15, wherein said controller turns on the main power when said second casing moves to said enlarging position, and turns off the main power when said second casing moves to said reducing position.