JP2008052112A - Foldable screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foldable screen designed such that the number of components is reduced, its structure is simplified, a screen cloth is prevented from being distorted or unstable despite an increase in the vertical size of the screen, and sufficient support strength is ensured. <P>SOLUTION: A pantograph mechanism 3 for supporting the screen cloth includes: a lower rhombus link assembly 4; an inverted-V-shaped reinforcement part 5 having a pair of beam members 51 and 52; and an upper rhombus link assembly 6 synchronized with the extending movement of the lower rhombus link assembly 4. The upper ends of both the upper left and right links, 41a and 41b, of the lower rhombus link assembly 4 are disposed so as to intersect each other and are pivotally supported at the intersection 44. The left and the right links 41a and 41b are extended upward from the intersection 44. The extended parts of the left and the right links serve as the lower left and the lower right links, 61c and 61b, of the upper rhombus link assembly 6. <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, the above prior art has a problem that the number of parts increases because the upper rhombus link structure is a separate structure from the lower rhombus link structure.

  Further, since the upper rhombus link structure is only connected to the lower rhombus link structure via the pivots of the left and right side links on the lower side, when the load of the drawn screen cloth is received, There is also a problem that the twisting phenomenon and wobble are likely to occur.

  Further, the entire upper rhombus link structure is located on the rear side of the lower rhombus link structure, and is arranged in a different state from the lower rhombus link structure. There will be a gap between the rear surface and the rear surface. That is, only the rigidity corresponding to the thickness of one link is supported with respect to the load of the screen cloth. For this reason, when the screen cloth is designed to be long in the vertical direction, it is difficult to correct the deformation of the screen cloth in a forward leaning manner because a rigid force that can sufficiently resist the increased load is not obtained. there were.

  The present invention has been made in view of the above circumstances, and the number of parts of the pantograph mechanism can be reduced, the structure is simplified, and even if the screen cloth is designed to be long in the vertical direction, the screen cloth It is an object of the present invention to provide a foldable screen that is unlikely to cause twisting and wobbling and that can secure sufficient support strength.

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 a state in which the screen cloth is wound and stored in the case, and the pantograph mechanism is configured to extend so as to follow the drawer of the screen cloth and maintain the drawn state. In the expression 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 which are arranged in an inverted V shape and whose upper ends are pivotally supported and connected to each other are pivotally supported on the lower left and right links in the lower rhombus link structure, and the lower ends of these beam members are An inverted V-shaped reinforcement attached to the case so as to be laterally movable;
An upper rhombus link structure connected to the upper side of the lower rhombus link structure so that four short links arranged in the rhombus are pivotally supported and connected, and interlocked with the expansion and contraction of the lower rhombus link structure; ,
With
The upper left link and the upper right link in the lower rhombus link structure are arranged on different planes in the front-rear direction,
The upper left and right side links in the lower rhombus link structure intersect with each other at the upper ends and are pivoted at the intersections, and are further extended upward from the intersections. It is configured as lower left and right side links in the upper rhombus link structure,
The folding screen, wherein the upper left link and the upper right link in the upper rhombus link structure are arranged on different planes in the front-rear direction.

  According to the invention of [1], since the upper rhombus link structure is connected above the lower rhombus link structure in the pantograph mechanism that supports the screen cloth, the screen cloth can be designed to be long (vertically long) and the pantograph mechanism The possibility of the pantograph mechanism protruding from the left and right ends of the case in the folded state is also eliminated.

  Also, the upper left and right side links on the upper side of the lower rhombus link structure are respectively extended upward, and each extension part is configured as the lower left and right side links on the upper rhombus link structure, respectively, so the number of parts can be reduced, The structure can be simplified, and the left and right side links on the upper side of the lower rhombus link structure and the lower side links on the lower side of the upper rhombus link structure are integrated as described above. The fabric is less likely to twist or wobble.

  Furthermore, the upper left link and the upper right link in the upper rhombus link structure are arranged on different planes in the front-rear direction, and the upper left and right side links overlap in the front-rear direction at the upper end of the upper rhombus link structure. The thickness is equivalent to two links, so that a strong rigidity sufficient to withstand the load on the screen can be obtained. That is, sufficient support strength can be ensured, and the screen cloth can be sufficiently prevented from being deformed forward in a stretched state.

  In addition, even if a torsional deformation is likely to occur between the upper rhombus link structure and the lower rhombus link structure, the torsional deformation is transmitted near the root of the pantograph mechanism due to the bracing function of the inverted V-shaped reinforcement. Therefore, an appropriate support function by the pantograph mechanism is ensured.

  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.

  1 and 2, the folding screen includes a case 1, a screen cloth 2, a pantograph mechanism 3, and elastic elastic members 7 and 7 for the screen.

  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 always provided with a return elastic force in the winding direction by a spring (not shown), and when the drawer end of the screen cloth 2 in the accommodated state is pulled upward against the elastic force. The screen cloth 2 is pulled out from the case 1.

  As shown in FIG. 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, and 41d made of, for example, square pipes or the like constitute each side of the rhombus. Further, when viewed from the rear of the screen cloth 2, for example, the upper left link 41a and the lower left and right side links 41c and 41d are located on the same plane close to the rear surface of the screen cloth 2, and the upper right link 41b is The links 41a, 41c, and 41d are disposed on different planes (planes separated from the rear surface of the screen cloth 2) (see FIGS. 2 and 3).

  The lower end of the upper left link 41a and the upper end of the lower left link 41c in the lower rhombus link structure 4 are pivotally connected and connected by a connecting member 42, and the lower end of the upper right link 41b The upper end portion of the lower right link 41 d is pivotally supported and connected by a connecting member 43.

  In addition, the lower ends of the lower left and right side links 41c and 41d in the lower rhombus link structure 4 are connected and pivotally supported via a pivotal support 45 at the center in the width direction of the case 1.

  As the left connecting member 42, the upper left link 41a and the lower left link 41c are located on the same plane. For example, a connecting body 421 as shown in FIGS. 422 is used.

  One connecting body 421 is formed by forming a male connecting piece 421c having a shaft hole 421b at the tip of the link mounting portion 421a, and the other connecting body 422 is formed at the tip of the link mounting portion 422a at the shaft hole 422b. The female connection piece 422c having the shape is formed.

  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 attaching parts 421a and 422a are located on the same plane. As a result, the upper left link 41a and the lower left link 41c are pivotally supported and connected to be rotatable on the same plane.

  Further, as the right connecting member 43, the upper right link 41b and the lower right link 41d are respectively located on different planes, and for example, as shown in FIGS. 5 (A) and 5 (B). The coupling bodies 431 and 432 are used.

  One connecting body 431 is formed by forming a connecting piece 431c having a shaft hole 431b at the tip of the link attachment portion 431a, and the other connecting body 432 is similarly provided with a shaft hole at the tip of the link attachment portion 432a. The connecting piece 432c having 432b is formed.

  The shaft body 433 is inserted into the shaft holes 431b and 432b in a state where the connection piece 431c of the one connection body 431 and the connection piece 432c of the other connection body 432 are overlapped in the axial hole direction via the interposition body 434. By attaching and fixing the washer to the shaft body 433, both the link attaching portions 431a and 432a are positioned on different planes. As a result, the upper left link 41b and the lower left link 41d are pivotally supported and connected so as to be rotatable on different planes.

  Of course, the left and right connecting members 42 and 43 are not limited to the above-described configuration, and any appropriate one can be employed.

  Since the lower end portions of the lower left and right side links 41c and 41d are located on the same plane, the pivot member 45 has a connection body having substantially the same structure as the connection member 42. Is used.

  The upper ends of the upper left and right side links 41a and 41b in the lower rhombus link structure 4 are crossed and pivotally supported by pins 44 and the like, and are formed to extend upward by a predetermined length from the crossing position. (See FIG. 3).

  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 a rear plane different from the lower rhombus link structure 4, and the respective intermediate portions are the lower left and right side links 41 c, 41 c on the lower rhombus link structure 4. 41d is pivotally supported by pins 511 and 521, respectively (see FIG. 3).

  Further, the ends of the beam members 51 and 52 are pivotally supported 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 provided rail portion 9.

  The upper rhombus link structure 6 is arranged so that four links 61a, 61b, 61c, 61d made of, for example, square pipes or the like constitute each side of the rhombus. Further, it is located above the lower rhombus link structure 4 and connected so as to interlock with the expansion and contraction operation of the lower rhombus link structure 6.

  The lower left link 61c in the upper rhombus link structure 6 is formed by an upper end extension portion of the upper right link 41b in the lower rhombus link structure 4, and the lower right link 61d in the upper rhombus link structure 6 is The upper rhombus link structure 4 includes an upper end extension portion of the upper left link 41a. That is, the lower left and right side links 61 c and 61 d in the upper rhombus link structure 6 are integrally formed on the upper part 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 upper left and right side links 61 a and 61 b are pivotally supported and connected by a connecting member 64.

  As the connecting member 62, the lower left link 61c and the upper left link 61a are located on the same plane, and therefore, the same connecting member 42 as shown in FIG. 4 (not shown) is used. Yes. Further, as the connecting member 63, the lower right link 61d and the upper right link 61b are located on the same plane, and therefore this is the same as the connecting member 42 shown in FIG. 4 (illustration is omitted). Is used.

  Further, as the upper connecting member 64 in the upper rhombus link structure 6, the upper left and right side links 61 a and 61 b are located on different planes (see FIGS. 2 and 3), so the connecting member 43 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.

  In FIGS. 1 and 2, reference numeral 8 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 reinforcing portion 5 and the upper rhombus link structure 6 in the pantograph mechanism 3, and the elastic elastic members 7, 7 for the screen contract and are accommodated together in the case 1. Is done.

  When a folding screen is used, when the case 1 is placed on an installation surface such as a floor via the installation member 8, when the upper end of the screen cloth 2 is grasped and pulled up, the rolled 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. 6 (B), and further rise up as shown in FIG. 6 (C). Is expanded.

  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, the upper rhombus link structure 6 and the lower rhombus link structure 4 stand up completely as shown in FIG. 1 and FIG. Will be.

  Here, since the pantograph mechanism 3 has a two-stage configuration in which the upper rhombus link structure 6 is connected above the lower rhombus link structure 4, a part of the pantograph mechanism 3 may be protruded from the left and right ends of the case 1 when folded. The uppermost end level position of the screen cloth 2 can be set high (that is, it can be designed to be long in the vertical direction).

  The lower left link 61c in the upper rhombus link structure 6 is formed by an upper end extension portion of the upper right link 41b in the lower rhombus link structure 4, and the lower right link 61d in the upper rhombus link structure 6 Since the upper rhombus link structure 4 is constituted by the upper end extension portion of the upper left link 41a, the number of parts is reduced as compared with the conventional structure in which the upper rhombus link structure 6 is configured separately. In addition, the structure is simplified.

  By the way, in the prior art, a part of the upper rhombus link structure is connected to the upper part of the lower rhombus link structure in a state of overlapping in the front-rear direction, so that the overlapping portion becomes a loss of height, and the uppermost end of the screen cloth 2 The level position cannot be set too high. On the other hand, in the present invention, since the upper rhombus link structure 6 is positioned and connected above the lower rhombus link structure 4, there is no overlapping portion between the link structures 4, 6, thereby reducing the height loss. As a result, the upper and lower lengths of the screen cloth can be set large.

  Further, since the lower links 61 c and 61 d of the upper rhombus link structure 6 are respectively integrated with the upper links 41 b and 41 a of the lower rhombus link structure 4, the front link is formed at the boundary portion between the upper rhombus link structure 6 and the lower rhombus link structure 4. Inclined deformation is unlikely to occur.

  Further, in the side view, since the upper left link 61a and the upper right link 61b of the upper rhombus link structure 6 are overlapped in the front-rear direction, the rigidity is increased, and the framework of the pantograph mechanism 3 is increased. It can be supported sufficiently against the screen load to be tilted forward. Thereby, for example, it is sufficiently possible to set the length of the screen cloth 2 in the vertical direction (vertical length) large without additionally providing a reinforcing material or the like.

  Even if the torsional deformation is transmitted to the lower left and right side links 41c and 41d of the lower rhombus link structure 4 due to the difference in level between the left and right links 41a and 41b on the upper side of the lower rhombus link structure 4, The bracing reinforcement action by the reverse V-shaped reinforcing portion 5 acts on the lower left and right side links 41c and 41d on the lower side of the V shape in the rhombus link structure 4, and the torsional deformation can be effectively prevented.

  For this reason, it is suppressed that a twisting force is transmitted to the lower end side of the lower rhombus link structure 4, and as a result, the forward tilting deformation of the entire pantograph mechanism 3 can be suppressed, and the screen cloth 2 is pulled out by the twisting suppressing force. Thus, a stable support state is ensured.

It is a rear view which shows the folding type 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. (A) is a disassembled perspective view which shows the connection member used in order to connect and pivot-support the links located on a different 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 7 ... Elastic expansion-contraction member 41a, 41b, 41c, 41d ... Link of lower rhombus link structure 44 ... pin (intersection pivot)
45 ... Lower end pivot part of pantograph mechanism 51, 52 ... Beam member of inverted V-shaped reinforcing part 61a, 61b, 61c, 61d ... Link of upper diamond link structure

Claims (1)

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 a state in which the screen cloth is wound and stored in the case, and the pantograph mechanism is configured to extend so as to follow the drawer of the screen cloth and maintain the drawn state. In the expression 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 which are arranged in an inverted V shape and whose upper ends are pivotally supported and connected to each other are pivotally supported on the lower left and right links in the lower rhombus link structure, and the lower ends of these beam members are An inverted V-shaped reinforcement attached to the case so as to be laterally movable;
An upper rhombus link structure connected to the upper side of the lower rhombus link structure so that four short links arranged in the rhombus are pivotally supported and connected, and interlocked with the expansion and contraction of the lower rhombus link structure; ,
With
The upper left link and the upper right link in the lower rhombus link structure are arranged on different planes in the front-rear direction,
The upper left and right side links in the lower rhombus link structure intersect with each other at the upper ends and are pivoted at the intersections, and are further extended upward from the intersections. It is configured as lower left and right side links in the upper rhombus link structure,
The folding screen, wherein the upper left link and the upper right link in the upper rhombus link structure are arranged on different planes in the front-rear direction.

Images