(19) Japanese Patent Office (JP)
`
`(12) Unexamined Patent
`Application Bulletin (A)
`
`(11) Laid Open Patent Application No.
`5 -42853
`
`(51) Int. C1.5
`
`B6OR 11/02
`5/64
`HO4N
`
`Identification
`Code
`
`Internal File No.
`
`(43) Publication Date
`
`February 23, 1993
`
`FI
`
`Tech. Indic.
`
`C
`521
`F
`581 C
`
`9144 -3D
`7205 -5C
`7205 -5C
`
`Examination Request: not yet made Number of Claims: 4 (Total 10 pages)
`
`(21) Application No.:
`
`3- 200250
`
`(71) Applicant:
`
`(22) Application Date:
`
`August 9, 1991
`
`(72) Inventor:
`
`(72) Inventor:
`
`(74) Agent:
`
`000005108
`Hitachi, Ltd.
`4 -6 Surugadai, Kanda, Chiyoda -ku,
`Tokyo -to
`YAMADA, Yuuichi
`Hitachi, Ltd. Yokohama plant
`292 Yoshidacho, Totsuka -ku,
`Yokohama -shi, Kanagawa -ken
`MAKIMOTO, Shinjiro
`Hitachi, Ltd. Yokohama plant
`292 Yoshidacho, Totsuka -ku,
`Yokohama -shi, Kanagawa -ken
`Patent Attorney, OGAWA, Masao
`
`FIG. 2
`/3 6!Z q 20 20 21
`
`.?_a
`
`9
`
`I! 12 13 14
`
`(54) Title of the Invention: SCREEN SUPPORT DEVICE
`
`(57) [Abstract]
`[Object] To immobilize a television or monitor screen,
`having a screen turning axis, against external vibrations,
`so as to improve usability, and to prevent the transmission
`of stress, resulting from screen turning operations or the
`aforementioned external vibrations, to the surface of the
`liquid crystal panel, so as to greatly improve the MTBF
`(mean time between failures) of the television or monitor.
`[Configuration] A first rotary shaft 8 of a turning body 22
`is engaged so as to be able to move in the axial direction
`with a first rotary shaft 9 [sic] provided in a frame 2; a
`second rotary shaft 10 [sic] is provided on a turning radius
`of the first rotary shaft 8; members that are pressed, from
`both the left and right sides, by a plurality of pressure
`washers 14, a braking boss 11, which passes through a tilt
`plate 6, and the second rotary shaft 10 are engaged so as
`to allow movement in the axial direction; and a screen 5 is
`immobilized by a braking force against the turning direction
`when the turning body 22 is turned around the first rotary
`shaft 8.
`
`Translation by Patent Translations Inc.
`
`206 -357 -8508 mail @PatentTranslations.com
`
`P. 1
`
`KAWASAKI -1028
`
`KAWASAKI-1037
`
`

`

`(2)
`
`JP-05-042853-A
`
`of seats in railway cars, buses or the like, were such that the
`screen was configured in a manner such that controlling force
`was applied, in a turning direction, to a rotary shaft in a fastening
`part in the back face of a seat, so that it was possible to turn the
`screen in the vertical direction, so as to allow viewing in a
`position that is easily viewed by a person, and the screen could
`be immobilized, resisting vibrations during travel.
`[0003] An example of a device having a structure of this type will
`be described, referring to the drawings.
`[0004] FIGS. 14 and 15 show front views, including partial
`sectional views, of the situation in which this is mounted on a
`back face of seat in a bus or a railway car; in FIG. 14, 101
`indicates a seat; 102 indicates a frame; 103 indicates a case that
`houses a television; 104 indicates a rotary shaft, which is a
`riveted rivet; 105 indicates a braking member having viscoelastic
`properties, made from a material such as rubber; and 106
`indicates the screen of a television or monitor.
`[0005] In this figure, the bottom of the case 103 turns around the
`rotary shaft 104, as a result of being pulled up by a person's
`hand, while being subjected to braking force, which is to say
`resistance, caused by the side face of the frame 102 and the
`side face of the case 103, on the braking member 105.
`[0006] Next, in FIG. 15, components that are the same as in the
`previous figure are given the same reference numerals, in
`addition to which, 107 indicates a casing made from metal, the
`case 103 being fastened in the casing 107, and the case 103
`and the casing 107 can be turned around the rotary shaft 104 by
`a person's hand, with respect to the frame 102, in the same
`manner as in FIG. 14 described above.
`[0007] Furthermore, as an example of a device, which is not for
`vehicle mounted use such as shown in FIGS. 14 and 15, but
`rather is mounted in an ordinary household, and which allows
`for turning and immobilization of the screen of a mountable
`television, "Designer Televisions Intended for Living Spaces," "4.
`Tilt Mechanisms" appearing on pages 17 and 18 of NEC
`Technology, Vol. 43, No. 9, 1990, can be cited.
`[0008]
`[Problems to Be Solved by the Invention] A first problem with
`the conventional example in FIG. 14 is that, due to the creep
`characteristics of the viscoelastic member 105, which applies
`the braking force for immobilizing the case 103 that is turned to
`the front, by way of compressing the viscoelastic member 105
`with the side face of the frame 102 and the side face of the case
`103, the effect of the braking force is weakened with the passage
`of time, such that the braking ceases to work, due to vibrations
`during travel, and the screen ends up turning.
`[0009] A second problem is that, if the case 103 is a member
`that is plastically deformed by weak forces, such as one made
`from plastic, the case 103 will warp when the rivet 104 is riveted,
`or the case 103 will warp when the bottom of the case 103 is
`held and the screen 106 is turned with respect to the frame 102,
`overcoming the aforementioned braking force, and the warp will
`be transmitted to the screen 106, which is fixedly engaged in the
`case 103, such that contact problems will occur at soldiering
`surfaces where the screen 106 is connected, and problems will
`occur in the image, with vertical lines and the like being
`produced on the screen 106.
`
`[Claims]
`[Claim 1] In a television system, or a monitor system, which is
`mounted in a traveling body such as a railway car or a bus, in
`which video and audio signals transmitted from input equipment,
`[such as] a receiver, distributor, modulator, video [player],
`amplifier, and mixer, is output on the image display unit or on the
`headphone speakers of a television or monitor fastened to a
`seat or a wall (hereafter, the television system or monitor system
`is referred to, abbreviated, as the television), a screen support
`device characterized in that: with a television body that includes
`the image display unit, wherein an axis parallel to the horizontal
`direction of the television image display screen serves as the
`center of rotation, first rotary shafts are provided at the left and
`right side faces of the television body, and allow the image
`display unit to turn in the forward and rearward directions with
`respect to a fastening part on a seat or a wall in the traveling
`body; on these same sides, second rotary shafts are provided
`on a radius that turns around the first rotary shaft; a left and right
`pair of first rotary bearings are provided in the side faces of a
`frame that is fastened to the seat or wall, which face the left and
`right side faces of the television body, and which engage the first
`rotary shafts so as to allow movement in the axial direction and
`allow turning; plates that are provided with a groove on a
`trajectory along which the second rotary shaft turns around the
`first -totary shaft, on a radius thereof, are fastened to the frame;
`a braking boss is passed through this groove; a braking washer
`is provided, with the braking boss passing therethrough, on both
`sides or on one side of the braking boss, and makes contact with
`the face of the plate in the vicinity of the groove; furthermore, the
`braking boss passes through the washer so that pressure is
`applied by a [wave] spring or a coil spring; a stopper is provided
`on the braking boss, which regulates the amount of elastic
`deformation of the [wave] spring or coil spring; the braking
`washer and the plate are brought into pressing contact; and
`when the television body is turned around the first rotary shaft,
`engaged on the braking boss so as to allow movement in the
`axial direction and allow turning with the second rotary shaft
`provided on the television body, a braking force is applied by
`way of the surface contact between the plate and the braking
`washers, which are pressed by the [wave] spring or coil spring,
`so as to tum and immobilize the television body.
`[Claim 2] A screen support device characterized in that, in claim
`1, the periphery of the television body is engaged surrounded by
`a metal case, and the first rotary shafts and the second rotary
`shafts are provided at the left and right side faces of the metal
`case.
`[Claim 3] A screen support device characterized in that, in the
`device of claim 1 or 2, resistance is applied to the braking boss,
`by a spring, in a direction that resists the gravitational force of
`the television body, so as to resist the gravitational force of the
`television body and cause the turning force resulting from the
`gravitational force to approach zero.
`[Claim 4] A screen support device characterized in that, in the
`device in claim 1, 2 or 3, a plastic case is fixedly engaged with
`metal that surrounds the periphery of the television body, with a
`gap provided with respect to the liquid crystal panel of the
`television body.
`[Detailed Description of the Invention]
`[0001]
`[Field of Industrial Application] The present invention relates
`to a mechanism for a device, which resists external vibration
`during travel so as to immobilize and support a turnable
`television, or image display unit of a display, which is mounted
`on a seat, a wall or the like, in a traveling body such as a railway
`car or a bus.
`[0002]
`[Prior Art] Conventional televisions, or image display units of
`image display units are referred to,
`displays (hereafter,
`abbreviated, as screens), which are mounted on the back face
`
`Translation by Patent Translations Inc.206- 357 -8508 mail @PatentTranslations.com
`P. 2
`
`

`

`[0010] A third problem is that, in order to immobilize the screen
`106 at an arbitrary easily viewed position, the magnitude of the
`braking force with respect to the strength of the vibrations during
`travel, must be established with a one -to -one correspondence
`to the turning force of the gravitational force of the television unit
`comprising the case 103 and the screen 106, and therefore the
`force that is applied with the hand to bring about the turning
`operation of the screen 106 will tend to be large, and thus there
`were problems in that, as a result, the usability was inferior.
`[0011] Next, in the conventional example in FIG. 15, it is possible
`to improve the problems in the image, which constitute the
`second problem, by surrounding the case 103 of the television
`screen with a metal casing 107, and thus preventing warp
`associated with turning of the case 103 by way of the degree of
`stiffness of the metal, but this does not deal with the first problem
`of the screen moving due to vibration during travel, or the third
`problem of the operational force being large and the usability
`being [inferior].
`[0012] Furthermore, in the example of the "Designer Televisions
`Intended for Living Spaces," a motor was used for the force that
`turns the screen, which necessitated the space for laying wires
`and for connecting mechanisms such as gears; and as this was
`a cathode ray tube television, there was a problem in that this
`could not be easily installed in a chair.
`[0013] Thus, an object of the present invention is to provide a
`screen support device with which tumable immobilization in any
`position is possible, even if there is vibration due to the
`movement of a traveling body, which is highly reliable and has
`good operability, without warp being transmitted to a liquid
`crystal panel, as a result of the stiffness of the case being
`increased, and in which the screen turning force is constant.
`[0014]
`[Means for Solving the Problems] In order to achieve the
`aforementioned object, in terms of the first problem of creep in
`the viscoelastic member, which generates the braking force that
`ensures the screen immobilization function: the television is
`fastened housed in a case; first rotary shafts and second rotary
`shafts are provided at the left and right side faces of the case; a
`frame is provided, fixedly engaged in the back face of a seat,
`arranged parallel to the longitudinal direction of each of the
`shafts, and perpendicular to the left and right side faces of the
`screen, which is provided with parts that are parallel to the left
`and right side faces of the case; first bearings are provided in
`the left and right side faces of the frame, allowing rotation with
`the first rotary shafts that are provided on the case, and having
`play in the longitudinal direction of the shafts; a second rotary
`shaft is provided with a stopper so that a plurality of [wave]
`springs made from a metallic material are elastically deformed
`within the allowable stress in the axial direction; the second
`rotary shaft is inserted into a groove in a breaking plate, with
`which immobilization is achieved by way of the elastic force, so
`as to pass through the same, and engaged, with play in the axial
`direction, in a hole in a boss, with the surfaces in the vicinity of
`the groove trapped between washers on both sides; and when
`[the television] is turned around the first shaft, this will turn while
`the boss and the washers that are engaged on the second shaft
`produce a braking force in the turning direction by way of the
`force of the [wave] springs on the breaking plate.
`[0015] In terms of the second problem: the case is made from a
`metallic material; the screen is engaged in the case, by way of
`an elastic material such as a spring; and a front panel is engaged
`on the case with a gap maintained relative to the screen.
`[0016] Next, in terms of the third problem that, when one
`attempts to apply a braking force in the vicinity of the rotary shaft,
`as in the conventional example, it is necessary to establish a
`large braking force, such that the force for turning the screen will
`be large: force is applied with a spring in the direction that
`approximately opposes the motive force of the turning body such
`as a television unit; and thus the force that is applied to the first
`
`shaft by the movement of the turning body in the motive force
`direction approaches zero.
`[0017]
`[Operation] The members that generate the braking force that
`ensures the function of immobilizing the screen are used by way
`of elastic deformation, within an allowable application, in the
`axial direction of a plurality of [wave] springs made from a
`metallic material, and therefore a braking force can be
`generated that is in accordance with the number thereof, without
`plastically deforming the [wave] springs; and the braking plate is
`trapped between washers on both sides, whereby twice the
`braking force can be achieved, as compared to pressing a
`washer on one side. As a result, the braking force will be
`constant for a long period of use.
`[0018] Next, the operation of turning the screen is one in which
`a screen that is housed in a metal case is turned, and therefore
`the operative force will be transmitted to the metal case and
`[absorbed] by the stiffness of the metal case, such that warp will
`not be transmitted to the screen, and there will not be problems
`on the screen.
`[0019] Next, the magnitude of the gravitational force due to
`shaking as a result of the vibration of the traveling body is
`proportional to the gravitational force of the turning body, and
`therefore, because the method is performed in which resistance
`is applied against the movement with a spring, so as to approach
`zero, a small braking force will suffice in order to [immobilize] the
`screen, such that a small operational force can also be
`established for turning.
`[0020]
`[Working Examples] One embodiment of the present invention
`will be described with reference to the drawings.
`[0021] FIG. 1 is an external perspective view including a partial
`sectional view of the situation when a screen support device,
`which is one embodiment of the present invention, is mounted
`in the back of a seat, in a bus or the like.
`[0022] FIG. 2 shows a schematic view, seen from above, of a
`section along line I -I in FIG. 1, which is a key part of the present
`invention; FIG. 3 shows a schematic view, seen from the
`direction of the arrow (A) in the drawing, of a partial section of
`FIG. 1, which is a key part of the present invention; and FIG. 4
`shows a schematic view, seen from the direction of the arrow (B)
`in the drawing, of a section along line li -II in FIG. 1, which is a
`key part of the present invention.
`[0023] In the figures; 1 indicates a bus seat; 2 indicates a front
`frame; 3 indicates a tightening screw; 4 indicates a front panel;
`5 indicates a screen; 6 indicates a tilt plate; 7 indicates a tilt plate
`fastening screw; 8 indicates a first rotary shaft; 9 indicates a
`second rotary shaft; 10 indicates a first rotary bearing; 11
`indicates a braking boss; 12 indicates a first braking washer; 13
`indicates a second braking washer; 14 indicates a pressure
`washer; 15 indicates a pressing boss; 16 indicates a pressure
`washer fastening screw; 17 indicates a U- shaped balance
`spring; 18 indicates a spring boss that fastens a coil part of the
`U- shaped balance spring; 19 indicates a spring- bearing part with
`which the tilt plate 6 is provided; 20 indicates a back cover; 21
`indicates a liquid crystal television unit; 22 is a turning body
`[comprising] the front panel 4, the screen 5, the first rotary shaft
`8, the second rotary shaft 9, the back cover 20, and the liquid
`crystal television unit 21; and 23 indicates a television unit
`fastening screw, which fastens the television unit 21 on the back
`cover 20.
`[0024] In figures 1 to 4, the first rotary shaft 8
`
`Translation by Patent Translations Inc.
`
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`. 3
`P206-
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`

`

`rotates centered in the first rotary bearing 10; and when the
`bottom of the turning body 22 is held by a hand and turned to
`the front or to the back, around the first rotary shaft, on the
`second rotary shaft 9, which is arranged at a fixed distance from
`the first rotary shaft 9 [sic], a plurality of pressure washers 14,
`the number of which is established as necessary for the
`pressure force and so the flexures thereof do not exceed the
`allowable stress, generate a braking force in the turning direction,
`at the faces at the periphery of a groove in the tilt plate 6, by way
`of the first washer 12 and the second washer 13, and immobilize
`the turning body 22 at that position.
`[0025] In the same figures, with the turning body 22 and the
`frame 2 and the tilt plate 6, which are fastened in the seat 1, a
`gap (S1 in FIG. 3) is provided in the axial direction for the first
`rotary shaft 8 and the first rotary bearing 10, and for the second
`rotary shaft 9 and the braking boss 11, which allows movement
`the axial direction, allowing for absorption of elastic
`in
`deformation in the axial direction resulting from the turning force
`that turns the turning body 22, such that this is not transmitted
`to the frame 2, and vice versa such that there is no transmission
`to the turning body 22 when the frame 2 is mounted in the seat
`1, or if the frame 2 itself warps.
`[0026] Furthermore, in the same figures, the liquid crystal
`television unit 21 is fastened in the back cover 20, which is made
`from metal, by the television unit fastening screws 23, and
`fastened such that a gap (S2 in FIG. 2) is maintained between
`the liquid crystal surface and the back face of the front panel 4;
`the screen 5 can be turned in the forward direction by pulling up
`the bottom end of the back cover 20 with a hand, and the screen
`5 can be retracted rearward by pushing the bottom end of the
`front panel 4, such that the screen 5 can be freely turned to an
`easily viewed position. When pushing at this time, the gap is
`maintained between the front panel 4 and the front face of the
`liquid crystal television unit 21, and therefore force is [not]
`transmitted to the liquid crystal surface 21a of the liquid crystal
`television unit 21, and also when the back cover 20 is pulled up,
`because this is made from metal, force is not transmitted to the
`liquid crystal television unit 21.
`[0027] Furthermore, the second shaft 9, which is engaged in the
`turning body 22, engages in the braking boss 11, and with the
`braking boss 11, the gravitational force of the turning body 22 is
`caused to approach zero, by way of the force of a U- shaped
`balance spring 18, which is fixedly engaged on the pressing
`boss 15.
`[0028] Immobilization of the turning body 22, while resisting
`vibration due to the outside forces from the traveling body, with
`the turning operation of the device configured as described
`above, in which the gravitational force of the turning body 22
`approaches zero due to the force of the U- shaped balance
`spring 18, which is to say the operation of the function that
`immobilizes the screen 5, will be described with reference to FIG.
`5 to FIG. 7.
`[0029] FIG. 5 shows a schematic view in which the situation in
`which the turning body 22 is housed in the seat is seen from the
`side; FIG. 6 shows a schematic view in which the situation in
`which the turning body 22 has been turned away from the seat
`through approximately one half of the forward stroke is seen
`from the side; and FIG. 7 shows a schematic view in which the
`situation in which the turning body has been turned through the
`full stroke is seen from the side. As shown in FIG. 5 to FIG. 7,
`the turning body 22 can be turned to any position, and in all of
`the situations, the [components] that are the same as in the
`previous figures are given the same reference numerals; in
`addition, W indicates the movement of the turning body 22; the
`x mark indicates the center of gravity of the turning body 22; XG,
`X'G, and X "G indicate the plumb -line distance, in the horizontal
`direction, from the center of the first shaft to the center of gravity
`of the turning body 22; P1, P2, and P3 indicate the spring force of
`the balance spring and the direction thereof; Q indicates the
`
`force application point between the balance spring and the
`second rotary shaft 9; and 11, 12, and 13 indicate the spring force
`contact length, to the center of the first rotary shaft 8, in the
`moment.
`[0030] In FIG. 5, the moment resulting from the gravitational
`force W of the turning body 22, having the first rotary shaft 8 as
`is WXG, in which the counterclockwise direction is
`its axis,
`defined as the positive direction and the clockwise direction is
`defined as the negative direction, and by applying approximately
`the moment of the U- shaped balance spring 17, which is -P111,
`so as to balance this moment, the force of turning around the
`first rotary shaft 8, due to the motive force of the turning body 22,
`approaches zero, and for the remaining moment which is not
`zero, which is AM = WXG- Pill, the first braking washer 12 and
`the second braking washer 13 press against the tilt plate 6 due
`to the force of the pressure washers 14, such that the sliding
`friction of each causes a braking force [to work], so as to
`immobilize the turning body 22 against external vibration from
`the traveling body, in the position shown in the figure, as a result
`of which the screen 5 is immobilized. Next, contact part 17a of
`the U- shaped balance spring 17 is approximately U- shaped
`because, with a torsion spring, the shorter the contact length is,
`the greater the force thereof will be, and thus this was configured
`so that the reactive force does not vary greatly with the position
`of contact, by doubling the contact part.
`[0031] In FIGS. 6 and 7, the turning body 22 has been further
`turned around the first shaft 8, and therefore in the same manner
`as in the previous figure, approximately P2 and P3 are applied
`so as to balance the moment resulting from the motive force W
`of the turning body 22 - WX'G and -WX "G with the moments P2I2
`and P3I3 resulting from the reactive force of the balance spring
`17, and in the same manner as described above, a braking force
`is applied by the force of the pressure washers 14, for the
`remaining moments AM2 and AM3, as a result of which the
`screen 5 is immobilized from the external vibration of the
`traveling body.
`In accordance with the foregoing
`[0032]
`example, an
`approximate balance in moments is sought, by way of the
`moment resulting from the motive force W of the turning body 22
`and the resistance of the U- shaped balance spring 17, whereby
`the turning forces that are actually produced by the turning body
`are such that the moments, which is to say the remaining
`moments AM1, AM2, AM3 are much smaller than the moment
`resulting from the movement of the turning body, whereby the
`screen 5 can be immobilized, resisting large external vibrations;
`and because the braking [force] is applied against this remaining
`moment, a small force suffices for turning the turning body 22
`with the hand.
`[0033] Next, a first application embodiment of the positioning
`embodiment of the present invention will be described hereafter
`with reference to FIGS. 8, 9 and 10.
`[0034] FIG. 8 shows a schematic view of the situation in which
`the turning body 22 is housed in a seat, as seen from the side,
`which corresponds to FIG. 5 in the previous example. FIG. 9
`shows a schematic view of the situation in which the turning
`body 22 has been turned away from the seat through
`approximately one half of the full stroke, which corresponds to
`FIG. 6 in the previous example. FIG. 10 shows a schematic view
`of the situation in which the turning body 22 has been turned
`away from the seat through approximately the full stroke, which
`corresponds to FIG. 7 in the previous example.
`[0035] In FIGS. 8 to 10, components that are the same as in the
`previous figures are given the same reference numerals, in
`addition to which, 24 is a dogleg- shaped balance spring, P4, P5,
`and P6 indicate the resistance of the dogleg- shaped balance
`spring 24 in each situation, and 14, 15 and 16
`
`Translation by Patent Translations Inc.
`
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`P. 4
`
`

`

`that corresponds to this gap in each case, the stress due to
`warping is not transmitted in either case, such that undue forces
`are not applied to either the turning body or the frame, and thus
`the weight of both the frame and the turning body can be
`reduced, which allows for reductions in the costs of the
`component parts.
`[0046] Next, the liquid crystal television unit is housed and
`fastened in a metal member, and a gap is provided between this
`and a front panel, in front of this, such that the force that turns
`the screen is absorbed by the metal member, rather than being
`transmitted to the liquid crystal surface, which has the effect of
`eliminating problems due to separation of the solder and the like
`at the liquid crystal surface, due to turning operations over a long
`period of time, and protecting the liquid crystal surface from
`[unusual] operations such as striking the front panel.
`[0047] Next, by pushing the weight of the turning body up with a
`spring, the bearing load on the parts that support the video [sic]
`body can be greatly reduced, which has the effect of allowing
`the sizes and weights of the component parts for the shafts,
`bearings and supports to be reduced, whereby the costs can be
`reduced and the working lives of the shafts and bearings can be
`greatly reduced [sic].
`[0048] Furthermore, because the weight of the turning body is
`pushed up by a spring, the force that turns the turning body as
`a result of the weight is reduced, such that braking of the screen
`against external vibrations from the traveling body is possible
`with great force, which has the effect of allowing the screen to
`be immobilized against greater external vibrations.
`[Brief Description of the Drawings]
`[FIG. 1] This is a perspective view showing the external
`appearance of a screen supporting device [according] to one
`embodiment of the present invention.
`[FIG. 2] This is a schematic view of a section along the line I -I in
`FIG. 1.
`[FIG. 3] This is a schematic view of a partial section of FIG. 1,
`seen from the direction of the arrow (A) in the figure.
`[FIG. 4] This is a schematic view of a section along the line II -Il
`in FIG. 1, seen from the direction of the arrow (B) in the figure.
`[FIG. 5] This is a schematic view of the operation of one
`embodiment of the present invention, seen from the side.
`[FIG. 6] This is likewise a schematic view seen from the side.
`[FIG. 7] This is likewise a schematic view seen from the side.
`[FIG. 8] This is a schematic view of the operation of a first
`application embodiment of one embodiment of the present
`invention, seen from the side.
`[FIG. 9] This is likewise a schematic view seen from the side.
`[FIG. 10] This is likewise a schematic view seen from the side.
`[FIG. 11] This is a schematic view of the operation of a second
`application embodiment of one embodiment of the present
`invention, seen from the side.
`[FIG. 12] This is likewise a schematic view seen from the side.
`[FIG. 13] This is likewise a schematic view seen from the side.
`[FIG. 14] This is a sketch of the external appearance of a
`conventional example.
`[Fig. 15] This is a sketch of the external appearance of a
`conventional example.
`[Explanation of the Symbols]
`1... seat,
`
`each indicate the contact length in the moment, resulting from
`the resistance of the dogleg- shaped balance spring 24, with the
`first shaft 8 as the turning center.
`[0036] In FIGS. 8, 9 and 10, the moments WXG, WX'G and WX "G
`produced by the motive force W of the turning body 22 around
`the first shaft 8, are balanced by the moments P414, P515, and P6I6
`when the balance spring 24 provides the resistance, and it is
`understood that the moment of turning force is much less than
`the turning moment due to the gravitational force of the turning
`body 22 alone.
`[0037] In this example, when the second shaft reaches the bent
`portion 24b of the contact part 24a of the dogleg- shaped balance
`spring 24, a click sensation is produced in the turning force of
`the turning body 22 at around this point, which has the
`advantage of making the feeling of having performed the
`operation clear.
`[0038] Next, a second application embodiment of one
`embodiment of the present invention will be described hereafter
`with reference to FIGS. 11, 12 and 13.
`[0039] FIG. 11 shows a schematic view of a situation in which
`the turning body 22 is housed in a seat, as seen from the side,
`which corresponds to FIGS. 5 and 8 in the previous examples.
`FIG. 12 shows a schematic view of the situation in which the
`turning body 22 has been turned away from the seat through
`approximately one half of the full stroke, as seen from the side,
`which corresponds to FIGS. 6 and 9 in the previous examples.
`FIG. 13 shows a schematic view of the situation in which the
`turning body 22 has been turned away from the seat through
`approximately the full stroke, as seen from the side, which
`corresponds to FIGS. 7 and 10 in the previous examples.
`[0040] In FIGS. 11 to 13, components that are the same as in
`the previous figures are given the same reference numerals, in
`addition to which, 25 is a coil spring, P7, P8, and Ps indicate the
`resistance of the coil spring 25 in each situation, and 17, 18, and
`Is each indicate the contact length in the moment resulting from
`the resistance of the coil spring 25, with the first shaft 8 as the
`turning center.
`[0041] In FIGS. 11, 12 and 13, the moments WXG, WX'G and
`WX "G produced by the motive force W of the turning body 22
`around the first shaft 8, are balanced by the moments P717, P818,
`Psls, when the coil spring 25 provides the resistance, and it is
`understood that the moment of turning force is much less than
`the turning moment due to the gravitational force of the turning
`body 22 alone.
`[0042] In this example, an advantage of the coil spring 25 is that
`there is generally no variation in the spring force, and therefore
`is possible to better balance the gravitational force of the
`it
`turning body 22.
`[0043]
`[Effects of the Invention] With the present invention, the elastic
`deformation of metal spring washers is used in applying a
`braking force to the turning body so as to immobilize the screen,
`and the amount of deformation, which is to say the flexibility, is
`regulated within the allowable stress, and the number of metal
`springs is increased in order to obtain the necessary braking
`force, which allows the function to be maintained with a constant
`braking force over long period of usage; and because the
`braking force is received on both faces of the tilt plate, which is
`trapped from both sides, the braking area is twice that in the
`case of one side, such that the turning body having twice the
`gravitational force can be immobilized.
`[0044] As a result, there is an effect in which the screen can be
`kept still in a turning position at all times, [against] external
`vibration from the traveling body, over long periods of time.
`[0045] Next, because there is a gap in the axial direction
`between th