JP3093127U - Portable screen - Google Patents

Abstract

(57) [Problem] To provide an inexpensive portable screen which is easy to carry and handle and has a simple configuration. A spring roll (2) is rotatably attached to a lower casing (1), and one end of a screen (4) wound around the spring roll (2) is pivotally attached to a top bar (3). Also, by appropriately setting a repulsive force or an upward urging force against the lowering by the height holding means 6 locked by the expansion and contraction supporting means 5 with respect to the elastic force and the gravity of the spring attached to the spring roll 2, The screen 4 can be set to a desired height.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention magnifies and projects an image displayed by a projection TV or projector. The shadow screen is easy to carry and can be placed on the floor, table or any other place. The present invention relates to a portable screen that can be installed.

[0002]

[Prior art]

  Images from projectors, including projection TVs, are generally reflective screens. The image is enlarged and projected on a screen or a transmissive screen.

[0003]   Of these screens, those that are used by being attached to the ceiling or wall The screen normally stored in the storage case can be It was pulled down and used. Also, a hanging screen or a tripod stand Do-type screens were used by hanging them in place or placing them on the floor.

[0004]   In addition, the screen wound on the spring roll can be stored in the storage case. Portable screens have also been proposed, and you can install a storage case anywhere you like, The screen was pulled up using the elastic force of springs etc. . As an example of a screen using a pantograph, four frame materials were used. I can list things. For example, let the electric motor roll out the screen However, the upward biasing force of the biasing member is used as the screen stopping force by stopping the electric motor. A method of further suppressing and maintaining the expansion of the screen (Japanese Utility Model Laid-Open No. 5-55143) Or, by expanding and contracting or folding the pantograph up and down using an electric motor, A method for expanding and retracting a screen wound around a spring roll (Patent Document 5 224302).

[0005]

[Problems to be solved by the device]

  However, recently, with the increase in meetings at companies or offices, It can be easily carried around with the projector and can be used on the floor of a conference room, a conference desk or A simple structure that can be installed on the table to project the image from the projector. The demand for portable screens is increasing.

[0006]   Furthermore, when pulling up the conventional pantograph, it was difficult to balance left and right. Therefore, the top bar is prone to tilt, and as a result, the screen sprinkles like a bamboo shoot when folded. The problem that it is easy to get caught in a long roll and damage the screen was there.

[0007]   In addition, the axial direction of the arm of the pantograph and the axial direction of the spring roll are misaligned. If it is installed in the condition, when the screen is extended, the spring roll and The screen bars are not twisted and the screen twists. But this To eliminate the twist of the pantograph, cover all parts that make up the pantograph. When mounting on the lower casing, high accuracy is required, which results in high cost. There was also a title.

[0008]   The present invention has been made in view of such a demand and a problem, and a project It can be easily carried with a computer, is easy to handle, and has a simple structure. The purpose is to provide an inexpensive portable screen.

[0009]

[Means for Solving the Problems]

  In order to achieve the above object, the portable screen of the present invention accommodates the screen. And a casing for rotatably attached to the casing, Spring roll biased in one direction, the top bar at one end and the spring roll at the other end. Screen that is attached to the roll and wound around the spring roll when stored. , Consists of at least 4 arms, and can expand and contract vertically The upper end is attached to the top bar of the screen, and it unwinds from the spring roll. A stretchable support means capable of supporting the screen and a symmetrical 1 Connect to each pair of arms to apply the biasing force of the spring roll in the winding direction. Against this, the telescopic support means is urged in the upward extension direction to maintain the screen at the desired height. A gas spring to be held, and an expansion and contraction support means and a tongue by the gas spring. By the upward urging force to the upper edge of the screen via the push bar and the spring roll. The screen can be stretched at the desired height by balancing the downward urging force to the lower edge of the screen. It is characterized in that it is configured so as to be held in Noh.

[0010]   Also, in the portable screen of the present invention, the telescopic support means is composed of four arms. It is equipped with a panda graph mechanism, and a pair of symmetrical arms is pivotally supported at one end. The other end of the pair of connected arms is pivotally connected to form a second auxiliary pandagraph mechanism. You can also do it.

[0011]   Also, in the portable screen of the present invention, the lower end of the expansion and While being pivotally attached to the middle section, the upper end can also be pivotally attached to the middle section of the top bar. .

[0012]   In addition, the portable screen of the present invention is such that the upper end of the expandable support means is attached to a member. While it is pivotally attached to the You can also

[0013]   In addition, the portable screen of the present invention is fixed to the above casing and can be folded up. In this case, it is necessary to provide a cushioning means for cushioning the impact of the expansion and contraction supporting means on the casing. I can do it.

[0014]   Also, the portable screen of the present invention may use a leaf spring as the cushioning means. Wear.

[0015]

[Embodiment of device]

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. <First Embodiment>   FIG. 1 shows a state when a portable screen S according to a first embodiment of the present invention is used. Shows the lower casing 1 and the lower casing via the mounting member 1b. Spring roll 2 attached to 1, top bar 3 and spring roll 2 The screen 4 stretched between the two and the pantograph type expansion and contraction for expanding and contracting the screen 4. It is provided with a supporting means 5 and a height holding means 6 composed of a gas spring.

[0016]   As the screen 4, a reflective layer is adhered to a glass or PET base cloth to reflect it. A bead layer or a polarizing layer was formed on the layer, and it was further covered with a resin layer. Known screens are used.

[0017]   As shown in FIG. 1, the expansion and contraction support means 5 is made of an aluminum hollow square pipe 6 The first arm 7 and the second arm 8 (second auxiliary pan tag) One end of the rough mechanism) is rotatably pivoted to the W-shaped member 1a in the middle portion of the lower casing 1. To wear. Subsequently, the other end of the first arm 7 is rotatably shown with one end of the third arm 9 in FIG. It is connected through the pair of end members 15a and intersects with the third arm 9 and is shown in FIG. Of the fourth arm 10 whose middle portion is rotatably locked via the spacer member 14. The end and the other end of the second arm 8 are rotatably connected via the end member pair 15a. Continued The other end of the third arm 9 via one end of the fifth arm 11 and the end member pair 15b shown in FIG. And rotatably connect the other end of the fourth arm 10 to the sixth arm 12. It is rotatably connected via one end and the end member pair 15b. Furthermore, the fifth arm 11 and And the other end of the sixth arm 12 is rotatably connected via the spacer member 14. On the other hand, the U-shaped member 13 is pivotally attached to the U-shaped member 13 while the U-shaped member 13 is By attaching a double nut type screw or E ring to the bracket 3a in the middle part, It is configured so that it can be rotated horizontally.

[0018]   Further, as shown in FIG. 1, a pair of gas springs used as the height holding means 6 One of the two ends is connected to the first arm 7 and the third arm 9 via the connecting portions. The other end is connected to the second arm 8 and the fourth arm 10, respectively. It is locked via the elastic force of the spring of the spring roll and the force of gravity against the gas. A repulsive force consisting of pressure can be generated.

[0019]   FIG. 5 shows a state where the portable screen S according to the present invention is not used. There is. The pantograph type expansion / contraction support means 5 is folded toward the lower casing side. That As shown in FIG. 6 which is a vertical cross-sectional view of FIG. It is locked by the locking means 18 and accommodated in the casing.

[0020]   The operation of the portable screen S according to the present invention having the above structure will be described below.   When not in use, the telescopic support means 5 is folded as shown in FIG. Since it has a substantially rectangular parallelepiped shape, it is extremely easy to store and carry. Take In the state, the screen 4 has a spring (Fig. It is completely wound around the spring roll 2 by the elastic force of (not shown) and expands and contracts. The six arms 7, 8, 9, 10, 11, 12 constituting the support means 5 are shown in FIG. Is fully folded so that it extends substantially parallel to the spring roll 2 and ing.

[0021]   When using it, pull the top bar 3 upwards and the spring roll 2 The screen 4 springs against the elastic force and gravity of the attached spring. It is pulled out from roll 2.

[0022]   High pressure gas is passed through a piston with an orifice to the gas spring. The volume inside the cylinder is changed as the piston rod expands and contracts. Is controlled by changing the gas pressure indirectly or directly through oil. It Here, when the screen 4 is going to descend, the piston rod is compressed. Therefore, repulsive force is generated by the gas pressure inside the gas spring, and The descent is suppressed, and the screen 4 can be set to an arbitrary height. Furthermore, Due to the frictional resistance of the hinge portions of the paired arm end members 15a and 15b, the screen The descent of the chain 4 is reliably suppressed.

[0023]   Here, when a pair of end members made of resin is used, a metal space is provided between the male and female hinge parts. You may insert a sir. Tighten the hinge part to increase the frictional resistance of the hinge part Even if it is worn, the male and female rubs of the hinge part are prevented from rubbing, and the unpleasant sound caused by the rub of the resin Never emit. Furthermore, by applying a lubricant, the top bar can be continuously Even if it is moved up and down, the hinge portion does not generate heat, and stable frictional resistance can be obtained.

[0024]   Also, a coil spring is attached to the engaging portion between the third arm 9 and the fourth arm 10. And applies an upward biasing force to the third arm 9 and the fourth arm 10, May be suppressed.

[0025]   Further, the expansion and contraction supporting means 5 is provided only in the central portion of the lower casing 1 and the top bar 3. Connected, conventional method that connects to the lower casing and top bar at two or more points Compared with the method, the frictional resistance of the left and right hinges and the repulsive force of the gas spring are made equal. Therefore, the left and right of the screen 4 can be easily balanced.

[0026]   Further, the top bar 3 and the expansion and contraction support means 5 are pivotally attached so as to be horizontally rotatable. So Therefore, unlike the conventional method in which the elastic support means is directly fixed to the top bar, The lower and upper shafts of the telescopic support means, the axial direction of the telescopic support means 5 and the spring roll. Even if the axial direction of 2 is slightly deviated, the spring force of spring roll 2 The top bar 3 is sprinkled because the clean 4 is pulled downward and tries to become the shortest length. The screen 4 is rotated at an angle parallel to the growl 2, and the twist of the screen 4 is eliminated. for that reason , Components and mounting parts of the elastic support means 5, and mounting of the elastic support means 5 Sometimes it doesn't necessarily need high precision.

[0027]   In addition, when storing, simply push the top bar 3 downwards to support the expansion and contraction. The means 5 does not fall, is slowly lowered and folded, and After winding the roll 4 around the spring roll 2 and rotating it to the state shown in FIG. , Stored in the casing.

[0028]   Here, a free piston type gas cylinder containing oil inside the cylinder By using the-, it is possible to more effectively prevent the telescopic support means from falling when descending. . The free piston type gas spring is located inside the cylinder of the piston rod. An orifice is provided in the piston provided at the tip of the section, When 5 is close to the folded state, the piston rod of the gas spring is It is pushed deep into the dar. At this time, the piston reaches the oil and presses it. Therefore, the rod cannot be pushed in abruptly. After that, the oil As the rod gradually passes through the fissure, the rod is pushed in gently, Is slowly folded.

[0029] <Second Embodiment>   FIG. 7 shows a state when the portable screen S1 according to the second embodiment of the present invention is used. Is shown. As the height holding means 6A, a pair of carps is used instead of the gas spring. The same as in the first embodiment, except that the spring 15c is used for the pair of arm end members. It is configured like.

[0030]   One of the coil springs is connected to the second arm 8 and the fourth arm 10 at the pivotal connection portion and the second arm 8. The other coil spring is locked to the first arm 7 and the other coil spring is It is preferably locked to the fifth arm 11 and a pivotal joint with the arm 12.

[0031]   Here, the coil spring is for applying an upward biasing force to the screen 4. Place the screen 4 against the elastic force and gravity of the spring of the spring roll. You can set it to the desired height. Further, the pair of pivotally attached arm end members 15c Due to the frictional force of the hinge part, the descent from the set height of the screen 4 can be surely suppressed. It

[0032] <Third Embodiment>   FIG. 10 is a perspective view of the portable screen S2 according to the third embodiment of the present invention when it is used. It shows the state. A cushioning means consisting of a pair of leaf springs is fixed to the lower casing 1. Except for the above, the configuration is similar to that of the first embodiment.

[0033]   The pair of cushioning means 20a and 20b respectively receive the arms 7 and 8 when folded. It is bent into an S-shape so that it can be stopped, and one end of the W-shaped member 1a is bent. It is fixed in the vicinity.

[0034]   When the elastic support means 5 approaches the folded state, the spring roll spring The elastic force of the ring and the repulsive force of the height holding means 6 against the gravity are reduced, and the telescopic support means 5 May fall. However, the buffer means 20 catches the arms 7 and 8. Therefore, it is possible to prevent the expansion and contraction support means 5 from colliding with the lower casing 1, and The impact on the lower casing 1 can be buffered by the sexual force, and a large impact can be achieved. It is also possible to prevent the generation of noise In addition, the limbs are pinched by the sudden drop of the telescopic support means 5. Since there is no risk of injury, safety during operation can be secured. Furthermore, expansion and contraction In order to slow down the fall of the supporting means 5, the hinge portion is tightened to reduce the frictional resistance of the hinge portion. Since there is no need to increase the size, frictional heat and unpleasant noise are generated at the hinge. It can be prevented.

[0035]   Further, in the present embodiment, the cushioning means composed of a pair of leaf springs is used as the W-shaped member. An example in which it is fixed to the lower casing 1 as a separate body from 1a is shown. The leaf spring may be fixed to the lower casing 1 as an integral body.

[0036]   Further, in the present embodiment, the pair of leaf springs is used as the cushioning means. Even if a pair of air dampers are used as the cushioning means instead of the springs, it is the same as the present embodiment. Such an effect can be obtained.

[0037]   Further, in the present embodiment, the pair of leaf springs is used as the cushioning means. Instead of the springs, a pair of coil springs may be used as the cushioning means. Coil sp Fix one end of the ring on the lower casing so that it can receive the arms 7 and 8. As a result, the same effect as this embodiment can be obtained.

[0038]

[Effect of device]

  Since the present invention is configured as described above, it has the following features. Produce an effect.   According to the present invention, a spring roll is rotatably attached to the lower casing, When one end of the screen wound on the spring roll is fixed to the top bar, In addition, the height holding means locked to the pantograph-type telescopic support means The screen can be set to the desired height to keep the screen horizontal It is easy to carry and handle, and it is an inexpensive portable disk with a simple structure. Can provide lean.

[0039]   Also, use either a gas spring or a coil spring for the height holding means. By doing so, the screen is controlled against the elastic force of the spring of the spring roll. You can set it to your will. Especially when using the gas spring, the screen Since it can be folded slowly, pantographs caused by a sudden drop during folding It is possible to suppress graph damage.

[0040]   In addition, a pantograph-type telescopic support in which a plurality of arms are pivotally attached to the telescopic support means. Since it is composed of a holding means, extension of the expansion and contraction supporting means when using the screen and the screen It is easy to fold the telescopic support means when not in use.

[0041]   Also, one end of the expansion and contraction support means is attached to the top bar through the attachment member. Therefore, the twist of the screen can be easily eliminated.

[0042]   In addition, shock absorbing means is provided in the lower casing, so it is It is possible to fold the telescopic support means without giving a great impact.

[0043]   Also, since a leaf spring is used for the buffering means, the impact on the lower casing is not affected by its elastic force. Can be weakened by

[Brief description of drawings]

FIG. 1 is a perspective view of a portable screen S according to a first embodiment of the present invention.

FIG. 2 is a side view of each spacer portion 14a used for connecting the arms in the first embodiment of the present invention.

FIG. 3 is a view showing a pair of end members 15a of an arm according to the first embodiment of the present invention, showing a top view (a) -1 and a side view (a) -2 of a convex portion and an upper surface of a concave portion. It is a figure (b) -1 and a side view (b) -2.

FIG. 4 is a view showing a pair of end members 15b of an arm according to the first embodiment of the present invention, showing a top view (a) -1 and a side view (a) -2 of a convex portion and an upper surface of a concave portion. It is a figure (b) -1 and a side view (b) -2.

FIG. 5 is a perspective view of the portable screen S of FIG. 1 in a folded state.

6 is a vertical cross-sectional view of the portable screen S of FIG. 1 housed in a casing.

FIG. 7 is a perspective view of a portable screen S1 according to a second embodiment of the present invention.

FIG. 8 is a side view (a) and a top view (b) of a spacer member 14a used for connecting arms according to a second embodiment of the present invention.

FIG. 9 is a front view (a) and a side view (b) of one of the pair of end members 15c used for connecting the arms according to the second embodiment of the present invention.

FIG. 10 is a perspective view of a portable screen S2 according to a third embodiment of the present invention.

[Explanation of symbols]

1 lower casing, 1a W-shaped member, 1b Spring roll mounting member, 2 spring rolls, 3 top bar, 3a bracket, 3b Top bar mounting member, 4 screens, 5 telescopic support means, 6,6A height holding means, 7,8,9,10,11,12 arm, 13 U-shaped member 14a spacer member, 15a, 15b, 15c arm end member pair, 17 Upper casing, 18 locking means, S, S1, S2 portable screen, 20 Buffer means.

Claims (6)

[Scope of utility model registration request] 1. A casing for accommodating a screen, a spring roll rotatably attached to the casing and biased in the winding direction, one end attached to a top bar and the other end attached to a spring roll. , A screen that is wound around the spring roll when stored, and a pandagraph mechanism that consists of at least four arms and that can expand and contract up and down, with the top end attached to the top bar of the screen, and the screen unwound from the spring roll Is connected to a pair of bilaterally symmetrical arms of the expansion and contraction support means, and the expansion and contraction support means is attached in the upward extension direction against the biasing force of the spring roll in the winding direction. And a gas spring that holds the screen at a desired height. It is configured to hold the screen in a stretchable manner at a desired height by the balance between the upward biasing force to the upper end of the screen via the holding means and the top bar and the downward biasing force to the lower end of the screen by the spring roll. Features a portable screen. 2. The expansion and contraction supporting means includes a pandagraph mechanism including four arms, and a pair of left and right symmetrical arms is pivotally connected at one end thereof and one end of the pair of arms is pivotally connected at the other end. The portable screen according to claim 1, wherein a second auxiliary panda graph mechanism is formed. 3. The portable screen according to claim 1, wherein a lower end of the expandable support means is pivotally attached to an intermediate portion of the casing and an upper end is pivotally attached to an intermediate portion of the top bar. 4. The portable screen according to claim 3, wherein the upper end of the expandable support means is pivotally attached to a mounting member, and the mounting member is horizontally rotatably mounted on the top bar. 5. The portable screen according to any one of claims 1 to 4, which is fixed to the casing, and is provided with a cushioning means for cushioning the impact of the expandable support means on the casing during folding. 6. A leaf spring is used as said buffer means.
Portable screen as described.