JP2008083283A - Foldable screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strong foldable screen which is hardly deformed to tilt forward by completely reinforcing the coupling parts of upper and lower links on both right and left sides in a lower rhombic link structural body even when screen cloth is designed to be long in up-and-down direction. <P>SOLUTION: A pantograph mechanism 3 for supporting screen cloth is equipped with the lower rhombic link structural body 4, a chevron-shaped reinforcing part arranged on the rear side of the structural body 4, and an upper rhombic link structural body 6 connected to the upper part of the lower rhombic link structural body 4 and interlocked with the elongating action of the lower rhombic link structural body 4. Then, a chevron-shaped link body 8 for reinforcing left-side joint is disposed to extend over the coupling part of the upper and lower links 41a and 41c on the left side in the lower rhombic link structural body 4, and a chevron-shaped link body 8 for reinforcing right-side joint is disposed to extend over the coupling part of the upper and lower links 41b and 41d on the right side in the lower rhombic link structural body 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a folding screen used for projecting images of various projection devices such as a slide projector, a film projector, a video projector, a liquid crystal projector, and an OHP used in a company, office, region, or home.

  As this type of screen, a pantograph mechanism is housed in a case in which a screen cloth is wound and accommodated in a roll shape, and the screen cloth is configured so that the screen cloth can be folded and pulled out. It has been.

  In the folding screen of the above configuration, if the screen is to be elongated vertically, the pantograph mechanism also increases accordingly.However, when the screen is folded, the link of the pantograph mechanism protrudes from the left and right ends of the case. There is a problem that the design of a long and long is naturally restricted.

In view of this, a configuration in which the pantograph mechanism is configured in two upper and lower stages has been proposed as a screen that can be designed to be vertically long without being restricted. Specifically, the four links arranged in the rhombus are pivotally supported and connected to each other so as to be vertically expandable and foldable, and the lower rhombus link structure whose lower end is pivotally supported in the case; The lower rhombus link part is an upper rhombus that is connected in a state where four short links arranged in a rhombus are pivotally connected to the lower rhombus link and overlapped with the upper part of the lower rhombus link structure. A foldable screen has been proposed in which a pantograph mechanism is configured with a link structure, so that the horizontal dimension of the pantograph mechanism is suppressed and the screen can be designed to be long in the vertical direction (long in the vertical direction) (Patent Document 1). reference).
JP 2005-345660 A

  However, in the above prior art, the pantograph mechanism has a two-stage upper and lower rhombus link structure composed of a lower rhombus link structure and a left upper link link and a right upper link connection in the lower rhombus link structure. As a result of the increased concentrated load on the portions, there is a problem that the pantograph mechanism is easily deformed forwardly from these connecting portions.

  This invention has been made in view of the above circumstances, and even if the screen cloth is designed to be long in the vertical direction, the connecting portions of the upper and lower links on the left and right sides of the lower rhombus link structure can be sufficiently reinforced, An object of the present invention is to provide a sturdy foldable screen that is unlikely to cause forward deformation.

  In order to achieve the above object, the present invention provides the following means.

[1] A screen cloth that is accommodated in a horizontally long case with an open upper surface in a roll-wound state by being urged by an elastic force in the winding direction, and is disposed on the rear side of the screen cloth and is With a pantograph mechanism for screen cloth support that can expand and contract in the direction,
The pantograph mechanism is folded in the winding state of the screen cloth and stored in the case, and the pantograph mechanism extends to follow the drawer of the screen cloth and is configured to hold the drawn state. In the folding screen,
The pantograph mechanism is
Four links arranged in a rhombus are pivotally connected and connected, and can be expanded and contracted in the vertical direction, and the lower rhombus link structure whose lower end is pivotally supported in the case;
A pair of beam members arranged in an inverted V shape in the rear surface of the lower rhombus link structure and pivoted and connected to the upper ends of the lower rhombus link structure are pivotally supported on the lower left and right links in the lower rhombus link structure, respectively. And an inverted V-shaped reinforcing portion in which the lower ends of these beam members are attached to the case so as to be laterally movable,
Four short links arranged in the rhombus are pivoted and connected, and the substantially middle part of the lower left and right side links is pivoted and connected to the upper left and right side links of the lower rhombus link structure, respectively. An upper rhombus link structure interlocking with the expansion and contraction motion of the lower rhombus link structure,
With
The left rhombus link structure is provided with a substantially left-handed left joint reinforcing link body in a manner straddling the connecting portion between the upper and lower links on the left side, and both upper and lower ends of the left rhombus reinforcing link body are the lower rhombus The left joint upper and lower links in the link structure are pivotally supported and connected to each other, while the lower rhombus link structure is provided with a substantially U-shaped right joint reinforcement link body in such a manner as to straddle the connection part between the upper and lower links on the right side. The folding screen is characterized in that the upper and lower ends of the right joint reinforcing link body are pivotally connected to and connected to the upper and lower links on the right side of the lower rhombus link structure.

  [2] The foldable screen according to item 1, wherein the joint reinforcing link body and the upper rhombus link structure on both the left and right sides are arranged on the same plane as the inverted V-shaped reinforcing portion.

  [3] The joint reinforcing link body on both the left and right sides is set to a size that does not interfere with the upper rhombus link structure and the inverted V-shaped reinforcing portion in the folded state of the pantograph mechanism. Folding screen.

  According to the invention of [1], since the pantograph mechanism for supporting the screen cloth is a two-stage configuration of the lower rhombus link structure and the upper rhombus link structure connected to the upper part, the screen cloth is elongated vertically (in the vertical direction). In addition, it is possible to design the pantograph mechanism while maintaining such a vertical length, so that the left and right widths of the pantograph mechanism can be reduced, so that a part of the pantograph mechanism protrudes from the left and right sides of the case in the folded state. Can be surely avoided.

  In addition, a substantially U-shaped left-side joint reinforcing link body is disposed so as to extend and contract in a manner straddling the connecting portion of the left upper and lower links in the lower rhombus link structure, and the right upper and lower links in the lower rhombus link structure are connected. The right-side joint reinforcing link body having a substantially U-shape extending in a manner straddling the part is arranged to be extendable, so that the pantograph mechanism is composed of a lower rhombus link structure and an upper rhombus link structure. In the lower rhombus link structure, the load concentrated on the joint portions of the upper and lower links on both the left and right sides is distributed to the joint reinforcing link bodies on the left and right sides, so that the joint portions can be sufficiently reinforced, and the pantograph mechanism Can be prevented from being tilted forward.

  According to the invention of [2], the joint reinforcing link bodies and the upper rhombus link structures on the left and right sides are arranged on the same plane as the inverted V-shaped reinforcing portion, that is, the joint reinforcing link bodies on the left and right sides, Since the upper rhombus link structure and the inverted V-shaped reinforcing portion are arranged on the same plane on the rear side of the lower rhombus link structure, for example, the joint reinforcing link bodies on both the left and right sides are located on the front side of the lower rhombus link structure As compared with the above, it is possible to more effectively prevent forward deformation of the pantograph mechanism while reducing the thickness of the pantograph mechanism in the front-rear direction and sufficiently reducing the thickness and size.

  According to the invention of [3], the contracting operation of the upper rhombus link structure and the contracting operation of the inverted V-shaped reinforcing part during the folding operation of the pantograph mechanism are obstructed (interfered by the joint reinforcing link bodies on the left and right sides). ) And can be carried out smoothly. In other words, while reducing the thickness of the pantograph mechanism in the front-rear direction and sufficiently reducing the thickness and making it compact, it can provide a sufficient reinforcing effect and sufficiently prevent the pantograph mechanism from tilting forward, and the pantograph mechanism can be contracted. Can be performed sufficiently smoothly.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 and 2 are a rear view and a right side view, respectively, showing a folding screen according to an embodiment of the present invention. This foldable screen includes a case 1, a screen cloth 2, a pantograph mechanism 3, elastic elastic members 7 and 7 for screens, and joint reinforcing link bodies 8 and 8 on both left and right sides.

  The case 1 is a horizontally long container with an open upper surface formed of, for example, metal or synthetic resin, and a screen cloth 2 is wound and accommodated in the case 1.

  The screen cloth 2 is constantly given a return elastic force in the winding direction by a spring (not shown), and pulls up the drawer end of the screen cloth 2 in the housed state against the return elastic force. The screen cloth 2 is pulled out from the case 1.

  As shown in FIGS. 1 to 3, the pantograph mechanism 3 includes a lower rhombus link structure 4, an inverted V-shaped reinforcing portion 5, and an upper rhombus link structure 6.

  The lower rhombus link structure 4 is arranged so that four links 41a, 41b, 41c, 41d made of, for example, square pipes or the like constitute each side of the rhombus on the same plane.

  In the lower rhombus link structure 4, the lower end of the upper left link 41a and the upper end of the lower left link 41c are pivotally connected by a connecting member 42, and the lower end of the upper right link 41b is The right link 41d on the side is pivotally connected and connected by a connecting member 43 (see FIG. 3).

  The upper ends of the upper left and right side links 41a and 41b in the lower rhombus link structure 4 are pivoted and connected to each other via a connecting member 44, and the lower left and right side links 41c, Each lower end portion of 41d is connected and pivotally supported via a pivotal support portion 45 that is attached and fixed to the central portion in the width direction of the case 1 (see FIG. 3).

  As the left connecting member 42, the upper left link 41a and the lower left link 41c are located on the same plane (see FIGS. 2 and 3), for example, in FIGS. 4A and 4B. Connected bodies 421 and 422 as shown are used.

  As shown in FIG. 4A, one connecting body 421 is formed by forming a male connecting piece 421c having a shaft hole 421b at the tip of a link mounting portion 421a, and the other connecting body 422 is a link. The attachment part 422a has a tip formed with a female connecting piece 422c having a shaft hole 422b.

  With the male connecting piece 421c of the one connecting body 421 inserted into the fitting groove 422d of the other connecting body 422, the shaft body 423 is inserted into the shaft holes 421b and 422b, and a washer is attached and fixed to the shaft body 423. By doing so, both link attachment parts 421a and 422a are located on the same plane. As a result, as shown in FIG. 4B, the upper left link 41a and the lower left link 41c are pivotally supported and connected to be rotatable on the same plane.

  In addition, since the upper right link 41b and the lower right link 41d are located on the same plane with respect to the right connection member 43 (see FIG. 3), the same connection body as shown in FIG. 421 and 422 are used.

  Also, with respect to the upper connecting member 44, since the upper left link 41a and the upper right link 41b are located on the same plane (see FIG. 3), the same connecting body 421 as shown in FIG. , 422 are used.

  Further, as the pivot support member 45, the lower end portions of the lower left and right side links 41c and 41d are arranged on the same plane (see FIG. 3), so that the structure is substantially the same as the connection member 42. A linking body having is used.

  Of course, the connecting members 42, 43, 44 and the pivot member 45 are not limited to the above configuration, and any appropriate ones can be adopted.

  The inverted V-shaped reinforcing portion 5 has a pair of beam members 51 and 52 made of, for example, a square pipe. These beam members 51, 52 are arranged in an inverted V shape on the same plane on the rear side of the lower rhombus link structure 4, and substantially intermediate portions of the beam members 51, 52 are respectively in the lower rhombus link structure 4. The lower left and right side links 41c and 41d are pivotally supported by pins 511 and 521 (see FIG. 3).

  Further, the upper ends of the beam members 51 and 52 are pivoted and connected by a connecting member 53, and rollers 54 and 55 provided at the lower ends of the beam members 51 and 52 are provided in the case 1. It is installed so that it can move laterally (left-right direction) with respect to the rail part 10 (refer FIG. 1).

  The upper rhombus link structure 6 includes four short links 61a, 61b, 61c, 61d made of, for example, square pipes on the same plane on the rear side of the lower rhombus link structure 4, that is, the inverted V-shaped reinforcing portion 5. Are arranged so as to constitute the sides of the rhombus. Further, the upper rhombus link structure 6 is connected so as to be interlocked with the expansion and contraction operation of the lower rhombus link structure 6 with its lower side overlapping the upper side of the lower rhombus link structure 4.

  The lower ends of the upper left and right side links 61a and 61b in the upper rhombus link structure 6 are pivotally supported by the connecting members 62 and 63 with respect to the upper ends of the lower left and right side links 61c and 61d, respectively. The upper ends of the left and right side links 61a and 61b on the upper side are connected to each other by a connecting member 64, and the connecting member 64 is fixed to the horizontal rail 20 to which the upper end of the screen cloth 2 is connected. (See FIGS. 1 and 3).

  The lower left and right side links 61c and 61d in the upper rhombus link structure 6 are respectively connected to the upper sides of the upper left and right side links 41a and 41b in the lower rhombus link structure 4 via pins 66 and 67, respectively. The lower ends of the lower left and right side links 61c and 61d are pivotally supported and connected via a connecting member 65 (see FIGS. 1 and 3).

  As the connecting members 62, 63, 64, 65, since the links 61a, 61b, 61c, 61d of the upper rhombus link structure 6 are all located on the same plane (see FIG. 3), the connecting member 42 shown in FIG. (Not shown) is used.

  As shown in FIG. 1, each of the elastic elastic members 7 and 7 for the screen is pivotally connected to the case 1 via pins 711 and 711, and each upper end is a lower rhombus link structure. 4 are pivotally supported and connected to substantially the center of the lower left and right side links 41c and 41d via pins 712 and 712, respectively.

  Each elastic elastic member 7 for screen has an elastic pipe 71, and a spring (not shown) is incorporated in the inside thereof in a contracted state. The screen cloth 2 can be easily pulled up by the upward spring force of the spring.

  The left and right joint reinforcing link bodies 8, 8 reinforce the left and right connecting members 42, 43 in the lower rhombus link structure 4.

  The left joint reinforcing link body 8 includes a pair of upper and lower links 811 and 812 arranged on the same plane as the upper rhombus link structure 6 (see FIGS. 1 to 3).

  The pair of upper and lower links 811 and 812 are arranged in a U-shape in such a manner as to straddle the left connecting member 42 on the inner side of the lower rhombus link structure 4, and are pivoted and connected to each other by a pivotal support 82. . The upper end of the upper link 811 is pivotally connected to the lower end of the upper left link 41a of the lower rhombus link structure 4 via a pin 83, while the lower end of the lower link 812 is lower rhombus. The lower left link 41c of the link structure 4 is pivotally supported and connected via a pin 84 to the lower left link 41c (see FIGS. 1 to 3).

  The right joint reinforcement link body 8 also includes a pair of upper and lower links 811 and 812 arranged on the same plane as the upper rhombus link structure 6 (see FIGS. 1 and 3).

  The pair of upper and lower links 811, 812 are arranged in a U-shape in such a manner as to straddle the right connecting member 43 on the inner side of the lower rhombus link structure 4, and are pivotally connected and connected to each other via a pivot 82. ing. The upper end of the upper link 811 is pivotally connected to the lower end of the upper right link 41b of the lower rhombus link structure 4 via a pin 83, while the lower end of the lower link 812 is lower rhombus. It is pivotally supported and connected to the upper end of the lower right link 41d of the link structure 4 via a pin 84 (see FIGS. 1 and 3).

  The joint reinforcing link bodies 8 on the left and right sides are set to a size that does not interfere with the upper rhombus link structure 6 in the folded state of the pantograph mechanism 3, that is, the upper rhombus link structure 6. The size is set so as not to prevent the folding operation.

  In FIGS. 1 and 2, reference numeral 9 denotes an installation member provided on the lower surface of the case 1 for stable installation on the floor surface.

  Next, a procedure for using the folding screen having the above configuration will be described.

  When not in use such as carrying or storing, the pantograph mechanism 3 is folded into a flat state as shown in FIG.

  As the pantograph mechanism 3 is folded, the screen cloth 2 is wound into a roll. In this state, the lower rhombus link structure 4, the inverted V-shaped reinforcement portion 5 and the upper rhombus link structure 6 in the pantograph mechanism 3, the joint reinforcement link bodies 8 and 8 on both the left and right sides, and the elastic elastic members 7 and 7 for the screen are provided. It shrinks and is housed together in the case 1.

  When the folding screen is used, when the case 1 is placed on an installation surface such as a floor via the installation member 9, when the upper end of the screen cloth 2 is grasped and pulled up, the roll screen cloth 2 is pulled out. .

  At this time, the upper rhombus link structure 6 and the lower rhombus link structure 4 in the contracted pantograph mechanism 3 begin to expand as shown in FIG. 5B and further stand up as shown in FIG. 5C. It is extended upward.

  On the other hand, the positions of the pivot portions (pins) 511 and 521 of the left and right beam members 51 and 52 in the inverted V-shaped reinforcing portion 5 rise, while the lower ends of the pair of beam members 51 and 52 approach and change. The V-shaped reinforcing portion 5 stands at an acute angle. As a result, the movements of the lower left and right side links 41c and 41d in the lower rhombus link structure 4 synchronize and extend smoothly.

  At this time, since the lower left and right side links 41c and 41d are pushed up by the elastic elastic members 7 and 7, the extension operation is performed more smoothly.

  When the screen cloth 2 is pulled up to the highest position, as shown in FIGS. 1 and 2, the upper rhombus link structure 6 and the lower rhombus link structure 4 stand up completely, so that the screen cloth 2 is held in its drawn position. Will be.

  Here, since the pantograph mechanism 3 has an upper and lower two-stage structure in which the upper rhombus link structure 6 is connected to the upper part of the lower rhombus link structure 4, the uppermost end level position of the screen cloth 2 can be set high (that is, The screen cloth 2 can be designed to be long in the vertical direction), and the left and right width dimensions of the pantograph mechanism 3 can be suppressed while the screen cloth 2 is designed to be vertically long in this way. It is possible to reliably avoid a part of the pantograph mechanism 3 from protruding from both sides.

  By the way, in a folding screen having a conventional structure in which the left and right joint reinforcing link bodies 8, 8 are not provided, the load on the upper side of the pantograph mechanism 3 is lower when the screen cloth 2 is pulled up to the uppermost position. Since the load concentrates on the left and right joints in the rhombus link structure 4, that is, the left and right connecting members 42 and 43, the pantograph mechanism 3 is likely to be inclined forward from these joints. On the other hand, in the present invention, the joint reinforcing link bodies 8 on both the left and right sides are used for the left upper and lower links 41a and 41c and the right upper and lower links 41c and 41d in the lower rhombus link structure 4. Since the tension action works and the load is also distributed to the left and right joint reinforcing link bodies 8, 8, the left and right connecting members 42, 43 are sufficiently reinforced, whereby the pantograph mechanism 3 is connected to the lower rhombus link structure 4. Even in the upper and lower two-stage configuration including the upper rhombus link structure 6, the connecting portions 42 and 43 can be sufficiently supported and reinforced, and forward deformation of the pantograph mechanism 3 can be prevented. That is, the screen cloth 2 can be supported in an appropriate state.

  The joint reinforcing link bodies 8, 8 on both the left and right sides are not particularly limited as long as they are in a position straddling the left and right connecting members 42, 43, but the lower part as in the above embodiment. The rhombus link structure 4 is preferably arranged on the same plane as the upper rhombus link structure 6 and the inverted V-shaped reinforcing portion 5 on the rear surface side of the rhombus link structure 4. Compared to the case where the pantograph mechanism 3 is arranged on the front side of the structure 4 and the like, the forward tilt deformation of the pantograph mechanism 3 can be more effectively suppressed, and the thickness of the pantograph mechanism 3 in the front-rear direction is reduced, so that the overall thickness is reduced.・ Compact size can also be achieved.

It is a rear view which shows the folding screen which concerns on one Embodiment of this invention. It is a right view which similarly shows a foldable screen. It is the perspective view which looked at the pantograph mechanism in the same folding type screen from the back side (illustration of a rail part was omitted). (A) is a disassembled perspective view which shows the connection member used in order to connect and pivot-support the links located on the same plane, (B) is a side view of the connection member of use condition similarly. It is operation | movement explanatory drawing of the pantograph mechanism accompanying the drawer | drawing-out of a foldable screen.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Screen cloth 3 ... Pantograph mechanism 4 ... Lower rhombus link structure 5 ... Reverse V-shaped reinforcement part 6 ... Upper rhombus link structure 8 ... Joint reinforcement link body 41a, 41b, 41c, 41d ... Lower rhombus link structure Link 51, 52 ... Beam member 61a, 61b, 61c, 61d ... Link of upper rhombus link structure 811 ... Upper link of joint reinforcement link body 812 ... Lower link of joint reinforcement link body

Claims (3)

The elastic force in the winding direction is energized and accommodated in a horizontally long case with the upper surface opened in a roll winding state, and is placed on the rear side of the screen cloth, and is stretched in the vertical direction. A pantograph mechanism for supporting a possible screen cloth,
The pantograph mechanism is folded in the winding state of the screen cloth and stored in the case, and the pantograph mechanism extends to follow the drawer of the screen cloth and is configured to hold the drawn state. In the folding screen,
The pantograph mechanism is
Four links arranged in a rhombus are pivotally connected and connected, and can be expanded and contracted in the vertical direction, and the lower rhombus link structure whose lower end is pivotally supported in the case;
A pair of beam members arranged in an inverted V shape in the rear surface of the lower rhombus link structure and pivoted and connected to the upper ends of the lower rhombus link structure are pivotally supported on the lower left and right links in the lower rhombus link structure, respectively. And an inverted V-shaped reinforcing portion in which the lower ends of these beam members are attached to the case so as to be laterally movable,
Four short links arranged in the rhombus are pivoted and connected, and the substantially middle part of the lower left and right side links is pivoted and connected to the upper left and right side links of the lower rhombus link structure, respectively. An upper rhombus link structure interlocking with the expansion and contraction motion of the lower rhombus link structure,
With
The left rhombus link structure is provided with a substantially left-handed left joint reinforcing link body in a manner straddling the connecting portion between the upper and lower links on the left side, and both upper and lower ends of the left rhombus reinforcing link body are the lower rhombus The left joint upper and lower links in the link structure are pivotally supported and connected to each other, while the lower rhombus link structure is provided with a substantially U-shaped right joint reinforcement link body in such a manner as to straddle the connection part between the upper and lower links on the right side. The folding screen is characterized in that the upper and lower ends of the right joint reinforcing link body are pivotally connected to and connected to the upper and lower links on the right side of the lower rhombus link structure.   The folding screen according to claim 1, wherein the joint reinforcing link body and the upper rhombus link structure on both the left and right sides are arranged on the same plane as the inverted V-shaped reinforcing portion.   3. The folding type according to claim 2, wherein the left and right joint reinforcing link bodies are set to a size that does not interfere with the upper rhombus link structure and the inverted V-shaped reinforcing portion in the folded state of the pantograph mechanism. screen.

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