1. A computer securable to an upstanding structure, the computer comprising:
a processor;
a memory device accessible by the processor;
a display device having a screen substantially positionable in a plane;
a keyboard having a top surface substantially positionable in a plane;
a housing supporting the memory device and the display device, the housing having a back surface engagable with the upstanding structure and a front surface, the front surface defining an opening positioned in line with the screen of the display device, the front surface having at least one coupling member positioned above or below the screen, the coupling member movably coupling the keyboard to the housing so that the keyboard is movable between:
(a) a first position where the plane of the top surface of the keyboard is substantially parallel with the plane of the screen; and
(b) a second position where the plane of the top surface of the keyboard intersects with the plane of the screen; and
at least one securing member operable to secure the housing to the upstanding structure.
2. The computer of claim 1, wherein: (a) the coupling member includes a plurality of spaced apart shafts positioned along an axis; and (b) the keyboard has a plurality of ends, each of the ends being rotatably coupled to one of the shafts.
3. The computer of claim 1, wherein: (a) the coupling member includes a plurality of spaced apart members; and (b) the keyboard has a plurality of ends, each of the ends slidably mating with one of the members.
4. The computer of claim 1, wherein the upstanding structure is selected from the group consisting of a wall of a facility, a wall of an elevator, an interior portion of a land vehicle, an interior portion of an air vehicle and an interior portion of a water vehicle.
5. A computer securable to an upstanding structure, the computer comprising:
a processor;
a memory device accessible by the processor;
a display device having a screen substantially positionable in a plane;
a keyboard having a top surface substantially positionable in a plane;
a housing supporting the memory device and the display device, the housing having a back surface and a front surface, the back surface engagable with the upstanding structure and the back surface having a substantially flat shape, the front surface defining an opening positioned in line with the screen of the display device, the front surface having a keyboard region located below the opening, the front surface defining a cavity within the keyboard region, the front surface including a plurality of spaced apart coupling members positioned within the keyboard region, the coupling members movably coupling the keyboard to the housing so that the keyboard is movable between:
(a) a first position where the plane of the top surface of the keyboard is substantially parallel with the plane of the screen, the plane of the top surface of the keyboard being located at or behind the plane of the screen; and
(b) a second position where the plane of the top surface of the keyboard is substantially perpendicular to the plane of the screen; and
at least one securing member operable to secure the housing to the upstanding structure.
6. The computer of claim 5, wherein the front surface has a one-piece construction.
7. The computer of claim 5, wherein the front surface has a plurality of walls which bound the cavity.
8. The computer of claim 5, wherein the cavity has a first portion defined by the front surface and a second portion defined by the back surface wherein the cavity is an opening extending from the front surface through the back surface.
9. The computer of claim 5, wherein: (a) each of the coupling members includes a shaft, the shafts being positioned along an axis; and (b) the keyboard has a plurality of ends, each of the ends being rotatably coupled to one of the shafts so that the keyboard is at least partially rotatable about the axis.
10. The computer of claim 5, wherein the keyboard has a plurality of ends, each of the ends slidably mating with one of the coupling members.
11. The computer of claim 5, wherein at least one of the coupling members includes a keyboard position control member.
12. The computer of claim 5, which includes a plurality of securing members, each of the securing members including at least one wall defining an opening extending from the front surface through the back surface.
13. The computer of claim 12, wherein at least one of the securing members includes a lock device.
14. The computer of claim 5, wherein the keyboard includes an input device selected from the group consisting of a mouse, a trackball, a touch pad and a stylus.
15. The computer of claim 5, wherein the upstanding structure is selected from the group consisting of a wall of a facility, a wall of an elevator, an interior portion of a land vehicle, an interior portion of an air vehicle and an interior portion of a water vehicle.
16. The computer of claim 5, wherein the upstanding structure includes a wall of a dwelling unit in a facility, the memory device includes a plurality of instructions which direct the processor to: (a) control an Internet browser based on inputs from a user; and (b) automatically redirect the Internet browser to a website designated for the facility when a designated event occurs.
17. The computer of claim 15, wherein the designated event is selected from the group consisting of an expiration of a period of time during which the user has made no inputs; the computer is shut off, the computer is reset and the Internet browser is opened.
18. The computer of claim 5, wherein the memory device includes a plurality of instructions which direct the processor to: (a) control an Internet browser based on inputs from a user; (b) automatically retrieve a designated image from a website designated for the facility when a designated event occurs; and (c) cause the display device to display the retrieved designated image for a period of time until a designated event occurs.
19. The computer of claim 18, wherein the designated image is selected from the group consisting of an advertisement image, a graphical representation of facility-related information and artwork.
20. A computer securable to an upstanding structure, the computer comprising:
a processor;
a memory device accessible by the processor;
a display device having a screen substantially positionable in a plane;
a keyboard having a top surface substantially positionable in a plane; and
a housing supporting the memory device and the display device, the housing having a back surface and a front surface, the back surface engagable with the upstanding structure and the back surface having a substantially flat shape, the front surface defining a first opening positioned in line with the screen of the display device, the front surface having a keyboard region located below the first opening, the front surface defining a second opening within the keyboard region, the front surface including a support member for the keyboard, the support member configured so as to orient the keyboard so that the plane of the top surface of the keyboard is substantially perpendicular to the plane of the screen.
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. An ultrasonic cleaning apparatus for removing scales andor sludge deposited on a top surface of a tube sheet of a heat exchanger or steam generator, comprising:
guide rails arranged in a line, each of the guide rails having a parallelepiped shape and a through-hole formed in a longitudinal direction;
ultrasonic element segments each including an ultrasonic transducer on one side of one guide rail, the ultrasonic transducer including a radiating plate, a magnetostrictive material pack, a magnetic field coil and an angle adjustor;
guide rail support segments each including a support plate disposed on one side of another guide rail, the support plate having a leg and a wheel provided to a lower side of the leg;
a metal wire guided through the through-holes of the guide rails; and
a flange unit provided to a hand hole of the heat exchanger or steam generator, and including a flange provided to the hand hole, a wire pulley securing one end of the metal wire, and guide rail couplers connected to the guide rails disposed at opposite sides,
wherein a plurality of segment groups each comprising at least one guide rail support segment and at least one ultrasonic element segment, with the radiating plate of the ultrasonic transducer slanted at a certain angle relative to the tube sheet, are arranged in a line via the metal wire on the top surface of the tube sheet along an inner wall of the steam generator.
2. The apparatus according to claim 1, wherein each of the guide rails is formed at a left side thereof with a single projection longitudinally formed on a center of the left side and a protrusion, and at a right side thereof with two projections longitudinally formed at opposite ends of the right side of the guide rail and a groove formed at a lower side of the projections to receive the protrusion so as to correspond to the left side of another guide rail linearly arranged next to the guide rail.
3. The apparatus according to claim 2, wherein the projections of the right side and the projection and protrusion of the left side of the guide rail are chamfered to have rounded upper edges and the groove is also chamfered to have a rounded upper edge to prevent the guide rails arranged in a line from being bent downward while allowing the guide rails to be easily bent upward.
4. The apparatus according to claim 1, wherein each of the ultrasonic element segments adjusts an angle \u03b2 between the radiating plate of the ultrasonic transducer and the tube sheet of the steam generator via the angle adjustor.
5. The apparatus according to claim 4, wherein the radiating plate of the ultrasonic transducer is slanted towards a center of the top surface of the tube sheet.
6. The apparatus according to claim 4, wherein the angle \u03b2 between the radiating plate of the ultrasonic transducer and the tube sheet of the steam generator is calculated by Equation:
\u03b2
=
sin
–
1
\ue8a0
(
C
LW
C
R
)
,
where CLW indicates a longitudinal wave speed in a medium on the tube sheet of the steam generator and CR indicates a Reyleigh wave speed on the tube sheet of the steam generator.
7. The apparatus according to claim 1, wherein each of the guide rails further includes a spacer on a side surface thereof facing the inner wall of the steam generator and a ball bearing provided to a distal end of the spacer.
8. The apparatus according to claim 1, wherein each of the guide rails further includes a hook at a lower side thereof.
9. The apparatus according to claim 1, wherein each of the guide rails has an isosceles trapezoidal shape, with right and left sides thereof slanted at opposite angles (\u03b8) of the right and left sides of the guide rail, to allow the guide rails to be arranged in a ring shape and parallel to the inner wall of the steam generator.
10. The apparatus according to claim 9, wherein, when the guide rail has an isosceles trapezoid with the opposite angles (\u03b8), the guide rail has a length (a) and a width (b) calculated by Equations:
a
\u2245
r
0
\xd7
2
\ue89e
(
\u03b8
\ue8a0
rad
)
=
r
0
\xd7
2
\ue89e
(
\u03b8
\ue8a0
\xb0
\xd7
\u03c0
180
)
,
and
b
=
(
r
0
–
r
i
)
\ue89e
cos
\ue89e
\ue89e
\u03b8
,
where r0 indicates a radius corresponding to the longest distance from a center of the guide rails arranged in the ring shape to a point of the guide rail and ri indicates an inner radius relating to a thickness of the guide rail.