JP3081027U - Folding screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and surely support a main frame in an upright state, and to reliably prevent occurrence of left / right swinging, tilting, slacking, etc. when a screen cloth is pulled out. Provide a folding screen that can be used. SOLUTION: A screen cloth 2 roll-wound in a horizontally long case 1 having an open upper surface, and four frame members are pivotally connected to a rear position of the screen cloth 2 so as to be vertically expandable and contractible and foldable. The main frame 3 of the pantograph mechanism, and the main frame 3
In a foldable screen provided with an elastic supporting member 4 for maintaining the desired elastic state, the upper ends of the frame members 3a and 3b located on the lower side of the main frame 3 are pivotally connected to each other. The lower end is supported by holding rods 12, 12 movably supported by rails fixed in the case 1, and the main frame 3 is stably stood on the case 1.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a folding screen used for projecting images of various video devices such as a slide, a video, a liquid crystal projector, and an OHP at a conference, a meeting, and a home.

[0002]

[Prior art]

 Several types of screens for projecting images from various video equipment as described above have been proposed.However, a folding screen that can accommodate components in a horizontally long case when not in use is known as a folding screen. It has the advantage of being compact overall and convenient to carry and store.

FIGS. 6 and 7 show a conventional folding screen, FIG. 6 is a rear view of the screen when the screen is pulled out, FIG. 7A is a vertical side view of the same, and FIG. It is a vertical side view of the stored folded state.

The above-mentioned folding screen accommodates a screen cloth 2 in which a roll-wound state is drawn upward and the winding elasticity is constantly urged in a horizontally long case 1 having an open upper surface. A main frame having a lower end pivot point fixed to the case 1 at the rear position of the screen cloth 2 formed in a pantograph mechanism capable of vertically expanding and contracting and folding the four frame members at the rear position of the screen cloth 2. 3 is disposed so as to fit in the case 1 when folded, and an elastic support member 4 for keeping the main frame 3 in a desired telescopic state is provided between the main frame 3 and the case 1. The main frame 3 expands and contracts in accordance with the pivot point and the upper edge horizontal rail 5 of the screen cloth 2 following the upward pulling and winding of the screen cloth 2. Pivoted to hold upright It has a structure.

The elastic support member 4 is formed of a telescopic cylinder in which a spring is housed therein and which is constantly stretched and elastically urged. On both sides of the main frame 3, the lower frame members 3 a and 3 b are formed. The upper end is pivotally connected in the middle, and the lower end of the elastic support member 4 is pivotally fixed to the case 1 side, so that the main frame 3 can be maintained in a desired expansion and contraction state so that the main frame 3 can be accommodated in the case 1 when folded. It has become.

[0006]

[Problems to be solved by the invention]

 By the way, in the above-mentioned folding screen, when the screen cloth 2 is pulled out, the main frame 3 stands up in a state of being extended upward. Basically, it is free to tilt left and right with the lower end pivot point a as a fulcrum, and the posture in the upright state is not stabilized. Although this is prevented by the support member 4, since the elastic support member 4 has elasticity, it becomes extremely unstable as a fixing means of the main frame 3, and therefore, the main frame 3 is moved upward. In the extended standing state, the upper end pivot point b of the main frame 3 is displaced to the left and right with respect to the vertical line passing through the lower end pivot point a, so that the screen cloth 2 swings left and right. Or the upper edge bar 5 of the screen cloth 2 is not leveled and pulled out. Slack occurs on one side clean cloth 2 or tilted to the left and right, there is a problem that interfere with the copy movies of the video.

[0007] Therefore, the problem of the present invention is to stably and surely support the main frame in an upright state extending upward, and when the screen cloth is pulled out, left and right swing, inclination, slack, etc. An object of the present invention is to provide a foldable screen that can reliably prevent occurrence.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, this invention involves storing a screen cloth in which a roll-up state is drawn upward and the winding elasticity is always energized in a horizontally long case with an open upper surface. A four-frame material is pivotally connected to the rear of the screen cloth in the case to form a pantograph mechanism that can be expanded and contracted and folded up and down.The main frame with the lower end pivot point pivoted to the case is folded. An elastic support member is provided between the main frame and the case to keep the main frame in a desired telescopic state. The main frame is expanded and contracted up and down following the screen cloth withdrawing and winding up the screen cloth, and the screen cloth is pivotally connected to the main frame so that it is held upright by this main frame. On the screen, In the middle of the frame material on both sides located below the main frame, the middle of the holding rods having the same length are pivotally connected, and the upper ends of the holding rods are pivotally connected to each other with the holding rods on both sides arranged in a C-shape. In addition, a configuration is adopted in which the lower end portions of the holding rods on both sides are movably supported by rails fixed in the case.

[0009] The above-mentioned both-side holding rod has a trochanter pivoted at the lower end thereof, and the trochanter is rotatably held in the lateral direction by the above-mentioned rail having an open side surface. Can be supported on the rail so that it can be moved laterally.

Further, the elastic support member is formed of a telescopic pipe in which a spring is housed inside and which is constantly stretched and is elastic. The elastic support member extends on both sides of the main frame in the middle of a lower frame material. The upper end of the contracted pipe is pivotally connected, and the lower end of the telescopic pipe is pivoted to the case side to maintain the main frame in a desired telescopic state.

[0011] Further, the elastic support member is formed of a telescopic pipe in which a spring is housed and the elasticity of the elastic support member is always extended, and the elastic support member is disposed inside the rail at an outer position of the both trochanters, One end of the telescopic pipe is connected to the shaft of the trochanter, and the other end is connected to the rail, so that the main frame can be maintained in a desired telescopic state.

[0012] The main frame is in an upright extended state, and the middle of both lower side frame members is supported by holding rods arranged in a C-shape positioned between the main frame and the rail. Is supported by this holding rod, so that when the main frame is extended upward, its upper-end pivot point is located on a vertical line passing through the lower-end pivot point. The screen cloth stably stands up, the screen cloth does not swing left and right, the upper edge of the screen cloth is horizontal, and the screen cloth pulled out does not tilt.

[0013]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the folding screen shown in FIGS. 6 and 7 described in the section of the related art will be described using the same reference numerals.

As shown in FIGS. 1 to 3, in the folding screen, a horizontally long case 1 having a U-shaped cross section with an open upper surface is horizontally arranged on a support base 6. The screen cloth 2 in which the drawer is drawn upward and the winding elasticity is always urged is stored in the state of being rolled up, and the main frame 3 is placed in the case 1 at the rear of the screen cloth 2 in the case 1 when the main frame 3 is folded. The main frame 3 has a rail 7 long in the lateral direction fixed to the rear of the main frame 3.

The main frame 3 is formed as a pantograph mechanism which can be vertically expanded and contracted and folded by pivotally connecting four frame members 3a to 3d having the same length by a pivot. The pivot is pivotally fixed to a bearing 8 fixed in the case 1, and is arranged so as to be accommodated in the case 1 at the time of folding. The main frame 3 is provided with an elastic support member 4 so that the pivot of the upper end pivot point b of the main frame 3 and the upper edge bar 5 of the screen cloth 2 follow the drawing up and winding up of the screen cloth 2. The main frame 3 expands and contracts up and down, and is pivotally connected so that the drawn-out screen cloth 2 is held upright by the main frame 3.

As shown in FIG. 4, the elastic support member 4 has a piston shaft 10 inserted into a long cylinder pipe 9, a spring 11 is housed inside the cylinder pipe 9, and is constantly extended. The upper end of the elastic support member 4 is pivotally connected to the lower side of the frame member 3 on both sides of the main frame 3, and the lower end of the elastic support member 4 is pivoted to the case 1 side. By doing so, the elasticity of the spring is balanced with the weight of the main frame 3, and the lower frame members 3 a and 3 b are given elasticity in the direction in which they are always erected, thereby maintaining the main frame 3 in a desired stretched state. become.

The elastic support member 4 is housed in the case 1 together with the main frame 3 when the main frame 3 is folded.

At the positions near the lower ends of the frame members 3a, 3b on both sides located below the main frame 3, the holding rods 12, 12 each having a length approximately half the length of the frame members 3a to 3b are pivoted. The upper ends of the two holding rods 12, 12 are pivotally connected to each other by a pivot 14 in a state where the holding rods 12, 12 are arranged in a U-shape, and the lower ends of the both holding rods 12, 12 are placed in the case 1. It is supported by the fixed rail 7 so as to be able to move laterally.

The above-mentioned both-side holding rods 12, 12 pivot the rotators 15, 15 at the lower ends thereof, and enable the trochanters 15, 15 to roll laterally by the rails 7 having open side surfaces. By holding, the lower ends of the holding rods 12 are supported by the rail 7 so as to be able to move laterally.

The holding rods 12, 12 on both sides and the frame members 3 a, 3 b on the lower side of the main frame 3 are arranged in an upside-down V-shape, and the intersections on both sides are pivotally connected at pivots 13, 13. By supporting the lower ends of the holding rods 12, 12 on both sides by the rails 7, the lower side frame members 3 a, 3 b of the main frame 3 are not swayed by the holding rods 12, 12 standing on the rails 7. Thus, when the main frame 3 is extended upward, the upper end pivot point B of the main frame 3 and the upper end pivots 14 of the both holding rods 12, 12 pass through the lower end pivot point a of the main frame 3. The main frame 3 is stably stood on the case 1 and does not swing left and right, and the upper edge bar 5 of the screen cloth 2 is horizontal. , And no inclination occurs in the drawn-out screen cloth 2.

The upper end of the both-side elastic support member 4 is pivoted to the frame members 3 a and 3 b above the pivoting position of the holding rod 12, and the pivoting position of the lower end to the case 1 is the main frame 3. Are set at positions equidistant on both sides of the lower end pivot point a.

FIG. 5 shows an example in which the two-sided elastic support members 4 are housed inside the rails 7. The two-sided elastic support members 4 are disposed inside the rails 7 at positions outside the both-side trochanters 15. The main frame 3 is maintained in a desired expanded / contracted state via the holding rods 12 on both sides by being connected to the shaft of the child 15 and connecting the other end to the rail 7. When the two-sided elastic support members 4 are accommodated inside the rails 7 as in this example, the two-sided elastic support members 4 cannot be seen from the outside, and the mechanism for supporting the screen cloth 2 has a neat appearance.

The structure of the support base 6 for supporting the case 1 is not particularly limited as long as it is of a foldable type whose height can be adjusted.

The screen of the present invention has the above configuration. When not used, the main frame 3 is folded flat to fit in the case 1 as shown in FIG. , 12 are linearly accommodated in the case 1, and the screen cloth 2 is wound up by the winding mechanism in the case 1, so that the entire appearance of the case 1 is obtained.

When using the screen, the main frame 3 may be lifted up to a required height by holding the upper end thereof. The main frame 3 stands up while being extended upward by this pulling, and is positioned below the main frame 3. When the frame members 3a and 3b on both sides stand inward with the lower end pivot point a as a fulcrum, the holding rods 12 on both sides move closer to the pivot points with the frame members 3a and 3b, and V At the same time, in the case of FIG. 1, both-side elastic support members 4 also stand between the frame members 3a, 3b on both sides and the case 1, and support the main frame 3 standing from both sides.

By pulling up the main frame 3, the screen cloth 2 is pulled out of the case 1 to be in a vertical arrangement, and is supported by the upright main frame 3. At this time, the main frame 3 can be held by the both-side holding rods 12 and 12 without rolling, so that when the main frame 3 is extended upward, its upper-end pivot stop point b and both-side holding rods 12 and 12 can be held. The upper end pivots 14 of 12 and 12 are positioned on a vertical line passing through the lower end pivot point a of the main frame 3 and are not displaced. For this reason, the main frame 3 stands upright on the case 1 with good stability. As a result, the upper edge bar 5 of the screen cloth 2 is reliably leveled, and the drawn-out screen cloth 2 does not tilt or loosen.

Further, the main frame 3 is stopped at a desired lifting height position by being supported by the elastic support members 4 on both sides. Therefore, it is necessary to hold the state where the screen cloth 2 is pulled out to a required height. After the screen is used, the upper end of the main frame 3 is pushed down to be folded, and the screen cloth 2 is wound up, so that these are stored in the case 1.

[0028]

[Effect of the invention]

 As described above, according to the present invention, the middle of the frame material located on the lower side of the main frame of the foldable screen can be moved laterally by the rail whose upper end is pivotally connected to each other and whose lower end is fixed in the case. When the main frame is extended upward, the upper and lower holding points of both holding rods are located on a vertical line passing through the lower and upper stopping points of the main frame. As a result, the main frame is supported by the holding rods on both sides between the lower frame and the rail, so that the main frame can be stably stood on the case. The upper edge of the screen cloth pulled out by the main frame does not swing to the left and right, so that the upper edge of the screen cloth is reliably leveled, and the screen cloth does not swing, tilt, or loosen.

[Brief description of the drawings]

FIG. 1 is a rear view showing a state in which a screen cloth of a screen according to the present invention is pulled out.

FIG. 2A is a longitudinal sectional side view of the same, and FIG. 2B is a longitudinal sectional side view of a folded state where a screen cloth is wound up.

FIG. 3A is a schematic view showing the relationship between the main frame and both holding rods in a state where the screen cloth of the screen according to the present invention is drawn out, and FIG. Schematic showing the relationship

FIG. 4 is a partially cutaway front view showing the structure of an elastic support member.

FIG. 5 is a schematic view showing an example in which an elastic support member is provided in a rail.

FIG. 6 is a rear view showing a state where a screen cloth of a conventional screen is pulled out.

FIG. 7A is a longitudinal sectional side view of the same, and FIG. 7B is a longitudinal sectional side view of a folded state where a screen cloth is wound up.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Screen cloth 3 Main frame 4 Elastic support member 5 Upper edge bar 6 Support stand 7 Rail 8 Bearing 9 Cylinder pipe 10 Piston shaft 11 Spring 12 Holding rod 13 Axis 14 Axis 15 Roller

Claims (4)

[Utility model registration claims] An upper surface is opened, and a screen cloth urged to be drawn upward and constantly resilient is housed in a horizontally long case having an open upper surface, and the screen cloth is placed in a rear position of the screen cloth in the case. The four frames are pivotally connected to form a pantograph mechanism that can be expanded and contracted and folded up and down.The main frame, with its lower end pivoted to the case, is arranged to fit inside the case when folded. An elastic support member is provided between the main frame and the case to keep the main frame in a desired stretched state, and the upper end pivot point of the main frame and the upper edge of the screen cloth are moved upward from the screen cloth. The main frame expands and contracts up and down following the drawing and winding of the folding screen, and the folding screen is pivotally connected so as to hold the drawn screen cloth upright with the main frame. Way of frame material on both sides Then, the holding rods having the same length are pivotally connected in the middle, the upper ends of both holding rods are pivotally connected to each other in a state where the holding rods are arranged in a C-shape, and the lower ends of the both holding rods are fixed in the case. A foldable screen that is supported by rails so that it can move laterally. 2. A trochanter is pivoted at the lower end of the holding rod on both sides, and the trochanter is rotatably held in the lateral direction by the rail having an open side surface, whereby the lower end of the holding rod is held by a rail. The foldable screen according to claim 1, wherein the foldable screen is supported so as to be able to move laterally. 3. The elastic support member is formed of an elastically urged telescopic pipe which always accommodates a spring and accommodates a spring therein. On both sides of the main frame, a telescopic pipe is provided in the middle of a lower frame material. 3. The foldable type according to claim 1, wherein an upper end of the telescopic pipe is pivotally connected, and a lower end portion of the telescopic pipe is pivotally connected to a case side to maintain a main frame in a desired telescopic state. screen. 4. The elastic support member is formed of a telescopic pipe in which a spring is accommodated therein and which is always stretched and elastically urged. The elastic support member is disposed inside the rail at an outer position of both trochanters. 4. The telescopic pipe according to claim 1, wherein one end of the telescopic pipe is connected to the shaft of the trochanter, and the other end is connected to the rail to maintain the main frame in a desired telescopic state. Folding screen.