JP2018155947A - Screen stretching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen stretching device which can cause prescribed stretching force to correctly act on a screen according to a nut fastening operation amount, and can maintain such a state that the stretching force acts by absorbing an extended margin even if the screen is slightly extended in a lateral direction at the time of use.SOLUTION: A screen stretching device 20A includes: a bolt 22 whose one end side is connected to a lateral direction end of a screen body 2 spreading vertically and horizontally; and a nut 24 which is screwed to the other end side of the bolt 22, and stretches the screen body 2 to an outer side in a lateral direction by fastening the nut 24. The screen stretching device includes a nut reception member 23c which receives a fastening load from the nut 24 and generates biasing force to the outer side in the lateral direction of the screen body 2 at a side where the nut 24 relatively moves with respect to the bolt 22 at the time of fastening of the nut 24.SELECTED DRAWING: Figure 5

Description

  The present invention obtains the flatness of a screen (also referred to as a “curtain”) used for, for example, a screen used for projection, projector, rear projection, or a window decoration or partition. Further, the present invention relates to a screen tensioning device that applies a tensile force in the horizontal direction of the screen.

  As this type of conventional screen tensioning device, there is one as shown in FIG. (See Patent Document 1). A screen tensioning device 101 shown in FIG. 13A is a device that pulls the screen 103 held at the top by a tubular horizontal bar 102 in the lateral direction, and is attached to the lateral end of the upper portion of the screen 103. A bolt 106 is connected to one end of the pulling piece 104 via a joint 105. Most of the bolt 106 is incorporated in the horizontal bar 102 with the other end protruding from the end surface of the horizontal bar 102. A nut 107 is screwed to the other end side of the bolt 106, and a nut stopper 108 is interposed between the end surface of the horizontal bar 102 and the nut 107. By tightening the nut 107, the screen 103 is moved in the horizontal direction. It can be pulled outward.

  The screen tensioning device 101 can accurately apply a tensile force of, for example, about 3 kg to the screen 103 by a nut tightening operation amount such that the nut 107 advances by, for example, 1 mm, thereby obtaining the flatness of the screen 103. it can.

  However, in the conventional screen tensioning device 101, since the nut tightening operation amount is applied to the screen 103 at a slight distance of about 1 mm in the initial stage of use to obtain the flatness, for example, If the screen 103 is slightly extended in the lateral direction due to a long-term repetition of temperature and humidity changes, the desired tensile force does not work and the flatness of the screen 103 is impaired. In addition, assuming that the screen 103 will be stretched over a long period of use in advance, a strong tensile force is applied at the initial stage of use by a nut tightening operation amount such that the nut 107 advances by 2 mm, or a strong tensile force such as 4 kg is used. Although it is conceivable to act at the initial stage of the above, an excessive tensile force is applied even though a strong tensile force is not necessary for correcting the elongation of the screen 103 due to the environmental change as described above. Therefore, wrinkles are generated on the screen 103 in the initial stage of use, which is not rational.

  On the other hand, as shown in FIG. 13B, as a means for obtaining the flatness of the screen even when the screen is stretched due to environmental changes or the like, as shown in FIG. There has been proposed an apparatus in which the screen body 111 is attached to the base frame 112 in a biased state (see Patent Document 2). Further, as shown in FIG. 13 (c), rollers 121 are wound around both sides of the screen 120, and springs 122 that urge the rollers 121 in the direction of pulling the screen 120 are connected to the rollers 121. Has been proposed (see Patent Document 3).

Japanese Patent No. 6056070 Japanese Patent Laid-Open No. 9-34014 Japanese Utility Model Publication No. 5-52839

  However, the ones proposed in Patent Documents 2 and 3 are simply configured to pull the screens 111 and 120 by the urging force of the springs 110 and 122, and are therefore required to obtain the flatness of the screens 111 and 120. There is a problem that it is difficult to adjust a predetermined tensile force so that the screens 111 and 120 are accurately applied.

  The present invention has been made in view of the above-described problems. A predetermined tensile force can be accurately applied to the screen in accordance with a nut tightening operation amount, and the screen can be laterally moved with use. An object of the present invention is to provide a screen tensioning device that can maintain a state in which a tensile force is applied by absorbing the elongation even if it is slightly elongated.

In order to achieve the above object, a screen tensioning device according to the present invention comprises:
A bolt having one end connected to the horizontal end of the screen extending vertically and horizontally, and a nut screwed to the other end of the bolt, and pulling the screen outward in the lateral direction by tightening the nut. Screen tensioning device
A nut receiving member that receives a tightening load from the nut and generates an urging force laterally outward of the screen is disposed on a side of the nut relatively moving with respect to the bolt when the nut is tightened. (First invention).

  The nut receiving member is preferably made of a plate-like elastic body that is inclined inward in the lateral direction of the screen in a state of being elastically deformed by receiving a tightening load from the nut (second). invention).

  The nut receiving member is preferably made of a plate-like elastic body that is inclined in the laterally outer side of the screen in a natural state before elastic deformation without receiving a tightening load from the nut ( Third invention).

  The nut receiving member is adapted to generate a biasing force outward in the lateral direction of the screen by being biased outward in the lateral direction of the screen by a leaf spring member utilizing a repulsive force against the bending of the plate-like elastic body. (4th invention).

  The nut receiving member is urged outward in the lateral direction of the screen by a compression coil spring fitted on the other end of the bolt, thereby generating an urging force laterally outward of the screen. (5th invention).

  According to the screen tensioning device of the present invention, the screen is pulled laterally outward by the axial force acting on the bolt according to the nut tightening operation amount, so that a predetermined tensile force is applied to the screen according to the nut tightening operation amount. Can act accurately. Further, according to the screen tensioning device of the present invention, the urging force from the nut receiving member is transmitted to the bolt through the nut, and the bolt is urged to the laterally outer side of the screen together with the nut. Even if the screen stretches slightly in the horizontal direction due to the long-term repetition of temperature and humidity changes, the bolts together with the nuts are stretched along the screen while applying a tensile force to the screen. Therefore, even if the screen slightly extends in the horizontal direction as it is used, it is possible to maintain the state where the tensile force is applied by absorbing the extension.

  Further, by adopting the configurations of the second to fifth aspects of the invention, the nut receiving member can generate a biasing force outward in the lateral direction of the screen with a very simple configuration.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a hanging shaft type suspension screen device including a screen tension device according to a first embodiment of the present invention. It is a figure which shows the screen main body pulled by the screen tension | pulling apparatus, (a) is the schematic showing the mode hold | maintained at the holding member, (b) is a detailed block diagram of the holding member. It is a fragmentary perspective view which shows the suspension support structure of a screen main body. It is a fragmentary perspective view which shows the screen tension | pulling apparatus of 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a principal part longitudinal cross-sectional view of the screen tension | pulling apparatus of 1st Embodiment, (a) is a screen tension state figure in the screen use initial stage, (b) is a screen tension state figure after absorption of screen horizontal direction extension. . It is a fragmentary perspective view which shows the screen tension | pulling apparatus of 2nd Embodiment. It is a principal part longitudinal cross-sectional view of the screen tensioning device of 2nd Embodiment, (a) is a screen tension state figure in the initial stage of screen use, (b) is a screen tension state figure after absorption of screen horizontal direction elongation. . It is a fragmentary perspective view which shows the screen tension | pulling apparatus of 3rd Embodiment. It is a principal part longitudinal cross-sectional view of the screen tension | pulling apparatus of 3rd Embodiment, (a) is a screen tension state figure in the initial stage of screen use, (b) is a screen tension state figure after absorption of screen horizontal direction extension. . It is a side view which shows the screen tensioning apparatus of 4th Embodiment. It is a principal part longitudinal cross-section partially broken view of the screen tension device of 4th Embodiment, (a) is a screen tension state figure in the screen use initial stage, (b) is the screen tension state after absorption of screen horizontal direction elongation. FIG. It is a figure which shows the screen apparatus of the other aspect to which a screen tension | pulling apparatus is applied, (a) is a roll entrainment type screen apparatus, (b) is a floor-standing type roll entrainment screen apparatus. It is explanatory drawing of a prior art.

  Next, specific embodiments of the screen tensioning device according to the present invention will be described with reference to the drawings.

[First Embodiment]
<Explanation of a hanging-shaft type suspension screen device>
A hanging shaft type screen device (hereinafter simply referred to as “screen device”) 1 shown in FIG. 1 is a substantially rectangular screen body 2 (corresponding to “screen” of the present invention). A tubular upper horizontal bar 3 disposed at the upper end of the screen main body 2 and a tubular lower horizontal bar 4 disposed at the lower end of the screen main body 2 are provided. When the upper end of the main body 2 is inserted, the screen main body 2 is held, and the upper horizontal bar 3 is suspended from the wall or ceiling so that the screen main body 2 is extended to project a movie or a projector image. ing. Here, since the upper horizontal bar 3 and the lower horizontal bar 4 have substantially the same structure, in the following description, the configuration of the upper horizontal bar 3 (hereinafter simply referred to as “horizontal bar 3”) is representative. Only explained.

  As shown in FIG. 3, the horizontal bar 3 is made of an aluminum extruded material and has a round tubular shape as a whole, and partition walls 5 and 6 extending in parallel to the longitudinal direction are formed inside. Openings (slits) 7 and 8 extending in the longitudinal direction are formed on the outer peripheral side, and an upper recess 9 and a lower recess 10 are defined between the partition walls 5 and 6 and the openings 7 and 8, respectively. It is supposed to be a shape. Here, the lower recess 10 is a space for holding the screen body 2 and the screen holding member 11 inside the horizontal bar 3.

  As shown in FIG. 2, the screen holding member 11 includes a left end holding member 12 arranged on the left end side of the horizontal bar 3 and a right end holding member 13 arranged on the right end side of the horizontal bar 3. The central portion holding member 14 arranged in the middle portion between the left end holding member 12 and the right end holding member 13 is divided into three parts. The lengths of the left end holding member 12, the right end holding member 13 and the center holding member 14 in the longitudinal direction of the horizontal bar 3 are approximately 1/3 of the width (upper end length) of the screen body 2 (ie, a : B: c = 1: 1: 1). The lengths of the left end holding member 12 and the right end holding member 13 may be set slightly longer than the length of the center holding member 14 (for example, when the width of the screen body 2 is 2 m, the left end The length of the part holding member 12 and the right end holding member 13 is set to 700 to 1200 mm).

  The central holding member 14 is divided into a plurality of (five in the illustrated example) height holding holding pieces 14 a in the longitudinal direction, and each of the height holding holding pieces 14 a is the upper end of the screen body 2. And functions to hold the height of the screen main body 2 without being affected by the tension of the left end holding member 12 and the right end holding member 13. Here, the length in the longitudinal direction of the horizontal bar 3 of each height holding holding piece 14a is set to 200 to 400 mm, for example.

  On the other hand, the left end holding member 12 and the right end holding member 13 are attached to the screen main body 2 independently of the central holding member 14, and the screen main body 2 is mainly used as the left end or the right end. Pulling members 12a, 13a having a function of pulling the screen body 2 and holding the height of the screen body 2, and a pulling piece (pulling) fixed to the end side of the pulling holding members 12a, 13a with an adhesive Metal fittings) 12b, 13b. More specifically, the upper end portion of the screen main body 2 is joined to the entire height of the screen main body 2 with the height holding holding piece 14a and the left and right pulling holding members 12a and 13a.

  Next, a screen tensioning device 20A that pulls the screen body 2 outward in the lateral direction will be described mainly with reference to FIGS. Here, FIG. 4 is a partial perspective view showing the screen tension device of the first embodiment, and FIG. 5 is a longitudinal sectional view of the main part of the screen tension device of the first embodiment. A screen tension state diagram (a) in the initial stage of use and a screen tension state diagram (b) after absorbing the lateral elongation of the screen are shown.

<Description of screen tension device>
As shown in FIGS. 4 and 5, the screen tensioning device 20 </ b> A includes a bolt 22 whose one end is connected to the tension pieces 12 b and 13 b via a joint 21 made of a piano wire, and an end attached to the end surface of the horizontal bar 3. And a plate 23.

  Most of the bolt 22 is incorporated in the horizontal bar 3 with the other end protruding from the end surface of the horizontal bar 3. A nut 24 is screwed to the other end of the bolt 22.

  The end plate 23 is made of a plate spring material such as a plate-like elastic body, for example, spring steel (SUP10, SK-5) or stainless steel for spring (SUS304-CSP), and is in contact with the end surface of the horizontal bar 3. A tongue-shaped main body member 23a to be fixed, a tongue-shaped nut receiving member 23c that is integrally connected to the main body member 23a via a bent portion 23b and overlaps the main body member 23a, and a main body member 23a The latching member 23d extends along the partition wall 5 from the bent portion 23b and engages with the partition wall 5 so as to be hooked on the partition wall 5.

  In the end plate 23, a body member 23a is formed on one side by folding a strip-shaped leaf spring material having a thickness of, for example, about 0.3 to 0.4 mm into two so as to have a U-shaped cross section. The nut receiving member 23c that engages with the nut 24 is formed on the side so as to face each other with a predetermined gap, and the base end side (upper end side) of the nut receiving member 23c is connected to the main body member 23a via the bent portion 23b. The front end side (lower end side) is a free end that can freely move in the horizontal direction of the screen body 2 (the axial direction of the horizontal bar 3).

  The main body member 23a is formed in a planar shape along the vertical direction so as to be in close contact with the end face of the horizontal bar 3, and the nut receiving member 23c is in a natural state before elastic deformation without receiving a tightening load from the nut 24. It is parallel to the main body member 23a and is inclined to the inner side in the horizontal direction of the screen main body 2 in a state of being elastically deformed by receiving a tightening load from the nut 24 (see FIG. 5A). Further, in the nut receiving member 23c, the insertion hole of the bolt 22 and the bent portion 23b are obtained so as to obtain a spring characteristic that generates an urging force of 2 kg or less at a distance of 1 mm toward the laterally outer side of the screen body 2. The distance, the width dimension, and the like are appropriately set and formed in a more appropriate shape. In this way, the nut receiving member 23c can generate a biasing force to the laterally outer side of the screen body 2 with a very simple configuration.

  The other end side of the bolt 22 is inserted into the main body member 23a and the nut receiving member 23c, and the nut receiving member 23c is disposed on the side where the nut 24 moves relative to the bolt 22 when the nut 24 is tightened. The nut receiving member 23c receives the tightening load. Thus, by tightening the nut 24, the tensile force is transmitted to the pulling holding members 12 a and 13 a via the bolt 22, the joint 21 and the pulling pieces 12 b and 13 b, and the left end holding member 12 and the right end holding member 13 are transmitted. A pulling force in the left-right direction is applied to the screen body 2 held by.

  Usually, the wrinkles generated in the screen main body 2 have a characteristic of becoming large wrinkles due to slight expansion and contraction of the screen main body 2. Therefore, in the screen device 1, the left end holding member 12 and the right end holding member 13 are connected to these ends. The structure is such that the tension applied by the part holding members 12 and 13 can be accurately extended over a distance of about 1 to 2 mm. On the other hand, the center holding member 14 has a structure that supports downward tension due to its own weight. With the holding members 12, 13, 14 thus divided into three being attached to the upper end of the screen body 2, a slight tension is applied from both sides by the left end holding member 12 and the right end holding member 13. By extending the screen body 2, even if there is a difference in expansion / contraction ratio between the screen body 2 and the horizontal bar 3, the entire holding members 12, 13, and 14 are dispersed and absorbed, and the difference in expansion / contraction distance is obtained. The expansion and contraction of the approximately 1/3 of the entire width (see the regions 18a and 18b in FIG. 2A) can be eliminated, and the occurrence of wrinkles can be prevented. In this case, since the right and left tension is not applied to the central portion of the screen main body 2, the height is not affected by the inclination of the pulling holding members 12a and 13a based on the pulling of the pulling holding members 12a and 13a. The holding piece 14a for holding acts only as a holding force against the own weight of the screen body 2, and thereby the smoothness of the screen body 2 is maintained.

  Here, the height of the holding piece 14 a for holding the height is set according to the hanging height of the screen body 2. Further, the heights of the left and right pulling holding members 12a and 13a are set to a height that is lower than the height holding holding piece 14a and corresponding to the left and right pulling forces.

  By the way, when a tensile force of about 3 kg is applied to the screen body 2 by a nut tightening operation amount such that the nut 24 advances by 1 mm with respect to the bolt 22, the natural state before elastic deformation without receiving a tightening load from the nut 24. Since the urging force generated by the nut receiving member 23c is 2 kg or less at a distance of 1 mm, the nut receiving member 23c parallel to the main body member 23a is elastically deformed by the tightening load from the nut 24 and bent. With the portion 23b as a fulcrum, the free end side is bent so as to approach the lower end of the main body member 23a, and finally pressed against the lower end of the main body member 23a, as shown in FIG. 5A, along the vertical direction. With respect to the planar main body member 23a, the screen body 2 is inclined inward in the lateral direction.

  In the screen tension state at the initial stage of use of the screen shown in FIG. 5A, a tensile force of about 3 kg is applied to the outer side of the screen body 2 in the lateral direction by the nut tightening operation amount so that the nut 24 advances by 1 mm with respect to the bolt 22. The flatness of the screen body 2 is maintained.

  As the use of the screen body 2 proceeds, the screen body 2 may slightly extend in the lateral direction due to a long-term repetition of temperature and humidity changes. At this time, as shown in FIG. 5B, the urging force from the nut receiving member 23 c is transmitted to the bolt 22 through the nut 24, and the bolt 22 is urged to the laterally outer side of the screen body 2 together with the nut 24. Then, the bolt 22 is moved together with the nut 24 to the outside of the screen body 2 in the lateral direction while the tensile force is applied to the screen body 2 laterally outward. Therefore, even if the screen main body 2 slightly extends in the lateral direction with use, it is possible to maintain the state in which the tensile force is applied by absorbing the elongation.

  Further, according to the screen device 1 including the screen tensioning device 20A, when the screen body 2 is expanded by applying tension to the left and right tension holding members 12a and 13a, the tension holding members 12a and 13a Since it is pulled in the left-right direction without being affected by the lowering force due to its own weight, the screen main body 2 can be moved in the left-right direction without deformation of the pulling holding members 12a, 13a. Since the screen main body 2 is expanded in the left-right direction while the height holding holder piece 14a is maintained in a horizontal state, the screen main body 2 can be expanded while maintaining smoothness.

[Second Embodiment]
Next, a screen tensioning device 20B according to a second embodiment of the present invention will be described mainly with reference to FIGS. Here, FIG. 6 is a partial perspective view showing the screen tension device of the second embodiment, and FIG. 7 is a longitudinal sectional view of the main part of the screen tension device of the second embodiment. A screen tension state diagram (a) in the initial stage of use and a screen tension state diagram (b) after absorbing the lateral elongation of the screen are shown. In the second embodiment, the same or similar parts as those in the first embodiment are designated by the same reference numerals in the drawings, and the detailed description thereof is omitted. Hereinafter, the second embodiment is referred to as the second embodiment. The description will focus on the specific parts (the same applies to the third and fourth embodiments described later).

  The end plate 25 attached to the end surface of the horizontal bar 3 is made of a plate-shaped elastic body, for example, a plate spring material such as spring steel (SUP10, SK-5) or spring stainless steel (SUS304-CSP). As a whole, the end surface of the rod 3 can be substantially closed, and the rod 3 has a substantially circular shape. The end plate 25 includes an inverted U-shaped main body member 25a that is in contact with and fixed to the end surface of the horizontal bar 3, and a tongue-shaped nut receiving member 25b supported by the main body member 25a. .

  In the end plate 25, a pair of elongated plate spring materials having a thickness of about 0.3 to 0.4 mm, for example, are elongated in the vertical direction with one end (lower end) side opened and the other end (upper end) side closed. By providing the notches 26 with a predetermined interval so as to sandwich the diameter position of the leaf spring material, the main body member 25 a is disposed outside the pair of notches 26 and the nut 24 between the pair of notches 26. While the nut receiving member 25b that engages with the body member 25b is formed, the base end side (upper end side) of the nut receiving member 25b is integrally coupled to the main body member 25a through the bent portion 27 to be a fixed end. The front end side (lower end side) is a free end that can freely move in the horizontal direction of the screen body 2 (the axial direction of the horizontal bar 3).

  The main body member 25a is formed in a planar shape along the vertical direction so as to be in close contact with the end face of the horizontal bar 3, whereas the nut receiving member 25b is formed on the outer side in the horizontal direction of the screen main body 2 in a natural state before elastic deformation. An inclination is given (see FIG. 7B), and a predetermined gap is formed between the free end of the nut receiving member 25b in the natural state and the end face of the horizontal bar 3. Further, in the nut receiving member 25b, the insertion hole and the bent portion 27 of the bolt 22 are obtained so that a spring characteristic is obtained such that an urging force of 2 kg or less is generated at a distance of 1 mm toward the laterally outer side of the screen body 2. The distance, the width dimension, and the like are appropriately set and formed in a more appropriate shape. In this way, the nut receiving member 25b can generate an urging force to the laterally outer side of the screen body 2 with a very simple configuration.

  The other end side of the bolt 22 is inserted into the nut receiving member 25b, and the nut receiving member 25b is disposed on the side where the nut 24 moves relative to the bolt 22 when the nut 24 is tightened. A nut receiving member 25b is received. Thus, by tightening the nut 24, the tensile force is transmitted to the pulling holding members 12 a and 13 a via the bolt 22, the joint 21 and the pulling pieces 12 b and 13 b, and the left end holding member 12 and the right end holding member 13 are transmitted. A pulling force in the left-right direction is applied to the screen body 2 held by.

  By the way, when a tensile force of about 3 kg is applied to the screen body 2 by a nut tightening operation amount such that the nut 24 advances by 1 mm with respect to the bolt 22, the nut receiving member 25 b that is inclined in a natural state is Since the urging force generated by the nut receiving member 25b is 2 kg or less at a distance of 1 mm, it is elastically deformed by receiving a tightening load from the nut 24, and the free end side becomes the end surface of the horizontal bar 3 with the bent portion 27 as a fulcrum. It is bent so as to approach, and finally it is pressed against the end face of the horizontal bar 3 to be flush with the main body member 25a as shown in FIG.

  In the screen tension state at the initial stage of use of the screen shown in FIG. 7A, a tensile force of about 3 kg is applied to the outer side of the screen body 2 in the lateral direction by the nut tightening operation amount such that the nut 24 advances 1 mm with respect to the bolt 22. The flatness of the screen body 2 is maintained.

  As the use of the screen body 2 proceeds, the screen body 2 may slightly extend in the lateral direction due to a long-term repetition of temperature and humidity changes. At this time, as shown in FIG. 7B, the urging force from the nut receiving member 25 b is transmitted to the bolt 22 through the nut 24, and the bolt 22 is urged to the laterally outer side of the screen body 2 together with the nut 24. Then, the bolt 22 is moved together with the nut 24 to the outside of the screen body 2 in the lateral direction while the tensile force is applied to the screen body 2 laterally outward. Therefore, even if the screen main body 2 slightly extends in the lateral direction with use, it is possible to maintain the state in which the tensile force is applied by absorbing the elongation.

[Third Embodiment]
Next, a screen tensioning device 20C according to a third embodiment of the present invention will be described mainly using FIG. 8 and FIG. Here, FIG. 8 is a partial perspective view showing the screen tension device of the third embodiment, and FIG. 9 is a longitudinal sectional view of the main part of the screen tension device of the third embodiment. A screen tension state diagram (a) in the initial stage of use and a screen tension state diagram (b) after absorbing the lateral elongation of the screen are shown.

  A slack prevention spring support plate 28 having a gate-shaped cross section is attached to the end of the horizontal bar 3 so as to straddle the partition walls 5 and 6. A slack preventing spring 29 is disposed between the slack preventing spring support plate 28 and the nut 24. The slack prevention spring 29 is made of a plate spring material such as a plate-like elastic body, for example, spring steel (SUP10, SK-5) or spring stainless steel (SUS304-CSP), and has a thickness of 0.3-0, for example. It is formed by subjecting a strip-shaped leaf spring material of about 4 mm to a required bending process. The slack prevention spring 29 includes a nut receiving member 29a that engages with the nut 24, and a pair of leaf spring members 29b that are integrally connected to both sides of the nut receiving member 29a. The leaf spring member 29b is formed to be bent in a substantially U-shaped cross section, and when the tip of the leaf spring member 29b abuts against the loosening prevention spring support plate 28 in a natural state before elastic deformation, the loosening prevention spring is formed. A predetermined gap (see FIG. 9B) is provided between the support plate 28 and the nut receiving member 29a.

  In the slack prevention spring 29, the insertion hole of the bolt 22 and the tip of the leaf spring member 29 b are obtained so as to obtain a spring characteristic that generates an urging force of 2 kg or less at a distance of 1 mm toward the laterally outer side of the screen body 2. The distance, the width dimension, and the like are appropriately set and formed in a more appropriate shape. Thus, the nut receiving member 29a can generate a biasing force outward in the lateral direction of the screen body 2 with a very simple configuration.

  The other end side of the bolt 22 is inserted into the nut receiving member 29a, and the nut receiving member 29a is arranged on the side where the nut 24 moves relative to the bolt 22 when the nut 24 is tightened. A nut receiving member 29a is received. Thus, by tightening the nut 24, the tensile force is transmitted to the pulling holding members 12 a and 13 a via the bolt 22, the joint 21 and the pulling pieces 12 b and 13 b, and the left end holding member 12 and the right end holding member 13 are transmitted. A pulling force in the left-right direction is applied to the screen body 2 held by.

  By the way, when a tensile force of about 3 kg is applied to the screen body 2 by a nut tightening operation amount such that the nut 24 advances by 1 mm with respect to the bolt 22, the urging force generated by the slack prevention spring is 2 kg or less at a distance of 1 mm. The leaf spring member 29b in the slack preventing spring 29 is elastically deformed by receiving a tightening load from the nut 24, and the leaf spring member 29b spreads so that the distal end side proceeds outward from the bent portion of the leaf spring member 29b. Finally, as shown in FIG. 9A, the nut receiving member 29a is pressed against the slack preventing spring support plate 28.

  In the screen tension state at the initial stage of use of the screen shown in FIG. 9A, a tensile force of about 3 kg is applied to the outer side of the screen body 2 in the lateral direction by the nut tightening operation amount such that the nut 24 advances by 1 mm with respect to the bolt 22. The flatness of the screen body 2 is maintained.

  As the use of the screen body 2 proceeds, the screen body 2 may slightly extend in the lateral direction due to a long-term repetition of temperature and humidity changes. At this time, as shown in FIG. 9B, from the nut receiving member 29a urged outward in the lateral direction of the screen body 2 by the leaf spring member 29b utilizing the repulsive force against the bending of the plate-like elastic body. The urging force is transmitted to the bolt 22 through the nut 24, and the bolt 22 is urged to the laterally outer side of the screen body 2 together with the nut 24, and the tensile force is applied to the screen body 2 laterally outward. The bolts 22 are moved together with the nuts 24 to the outside in the lateral direction of the screen body 2 by an amount corresponding to the extension of the screen body 2. Therefore, even if the screen main body 2 slightly extends in the lateral direction with use, it is possible to maintain the state in which the tensile force is applied by absorbing the elongation.

[Fourth Embodiment]
Next, a screen tensioning device 20D according to a fourth embodiment of the present invention will be described mainly with reference to FIGS. Here, FIG. 10 is a partial perspective view showing the screen tension device of the fourth embodiment, and FIG. 11 is a partially cutaway longitudinal sectional view of the main part of the screen tension device of the fourth embodiment. The screen tension state diagram (a) at the initial stage of use of the screen and the screen tension state diagram (b) after absorption of the lateral elongation of the screen are respectively shown. The fourth embodiment is an example in which a screen pulling device is provided on a roll roll type horizontal bar that is suitable for use in a roll roll type screen device (see FIG. 12).

  A loosening prevention spring support plate 30 is attached to a portion near the outer periphery of the end face of the horizontal bar 3. A slack preventing spring 31 is disposed between the slack preventing spring support plate 30 and the nut 24. The slack prevention spring 31 is formed of a compression coil spring made of a spring wire such as piano wire (SWP-A) or stainless wire (SUS304-WPB, SUS302), and is externally fitted to the other end of the bolt 22. Yes. Between the slack prevention spring 31 and the nut 24, a cover member 32 for a slack prevention spring having a gate shape in cross section is disposed. The cover member 32 for the slack prevention spring is formed by subjecting a metal plate material such as SUS304 or an iron plate to a predetermined bending process, a nut receiving member 32a that engages with the nut 24, and the nut receiving member 32a. It is composed of a pair of leg members 32 b that are integrally provided on both sides and extend straight toward the slack prevention spring support plate 30.

  In the slack prevention spring 31, the wire diameter, the number of turns, etc. of the compression coil spring are appropriately set so as to obtain a spring characteristic that generates an urging force of 2 kg or less at a distance of 1 mm toward the laterally outer side of the screen body 2. Is set to a more appropriate spring constant. Thus, the nut receiving member 32a can generate a biasing force outward in the lateral direction of the screen body 2 with a very simple configuration.

  The other end side of the bolt 22 is inserted into the nut receiving member 32a, and the nut receiving member 32a is disposed on the side where the nut 24 moves relative to the bolt 22 when the nut 24 is tightened. A nut receiving member 32a is received. Thus, by tightening the nut 24, the tensile force is transmitted to the pulling holding members 12 a and 13 a via the bolt 22, the joint 21 and the pulling pieces 12 b and 13 b, and the left end holding member 12 and the right end holding member 13 are transmitted. A pulling force in the left-right direction is applied to the screen body 2 held by.

  By the way, when a tensile force of about 3 kg is applied to the screen main body 2 by a nut tightening operation amount such that the nut 24 advances by 1 mm with respect to the bolt 22, the urging force generated by the loosening prevention spring 31 is 2 kg or less at a distance of 1 mm. Therefore, the slack preventing spring 31 is elastically deformed by receiving a tightening load from the nut 24 via the nut receiving member 32a in the slack preventing spring cover material 32, and the pair of leg members 32b in the slack preventing spring cover material 32 is formed. The cover member 32 for the slack preventing spring is moved so as to approach the slack preventing spring support plate 30, and finally the pair of leg members 32b abut against the slack preventing spring support plate 30 as shown in FIG. .

  In the screen tension state at the initial stage of use of the screen shown in FIG. 11A, a tensile force of about 3 kg is applied to the outer side in the lateral direction of the screen body 2 by the nut tightening operation amount such that the nut 24 advances 1 mm with respect to the bolt 22. The flatness of the screen body 2 is maintained.

  As the use of the screen body 2 proceeds, the screen body 2 may slightly extend in the lateral direction due to a long-term repetition of temperature and humidity changes. At this time, as shown in FIG. 11 (b), the urging force from the nut receiving member 32 a urged outward in the lateral direction of the screen body 2 by the slack prevention spring 31 is transmitted to the bolt 22 via the nut 24. Then, the bolts 22 are urged together with the nuts 24 in the lateral direction of the screen body 2, and the bolts 22 together with the nuts 24 are stretched by the extension of the screen body 2 while applying a tensile force to the screen body 2 laterally outward. Is moved laterally outward of the screen body 2. Therefore, even if the screen main body 2 slightly extends in the lateral direction with use, it is possible to maintain the state in which the tensile force is applied by absorbing the elongation.

  As mentioned above, although the screen tensioning device of the present invention has been described based on one embodiment, the present invention is not limited to the configuration described in the above embodiment, and the configuration is appropriately changed without departing from the gist thereof. Is something that can be done.

  In the first to third embodiments described above, the example applied to the hanging type suspension screen device shown in FIG. 1 has been described. However, the present invention relates to a roll entrainment as shown in FIG. The present invention can also be applied to the screen device 1A. Further, the present invention can also be applied to a floor-standing roll entrainment screen device 1B as shown in FIG. Here, the roll-in type screen device 1A (FIG. 12 (a)) includes a rotary type winding drum 33 by electric force or spring force, and the upper end of the screen body 2 is attached to the winding drum 33, and the roll The screen body 2 is raised and lowered by the entraining device 34. In the figure, reference numeral 35 denotes a lower horizontal bar, and reference numeral 36 denotes a handle. On the other hand, in the floor-mounted roll entraining screen device 1B (FIG. 12B), a rotary winding drum 37 by electric or spring force is provided in the lower part, and the end of the screen main body 2 is pulled up, and then the lower part is placed in the lower part. An end portion of the upright support column 38 is attached and extended. In the figure, the reference numeral 39 indicates a roll entraining device, the reference numeral 40 indicates an upper horizontal bar, and the reference numeral 41 indicates a support mounting portion.

  In the above-described embodiment, an example in which the present invention is applied to a projection screen or a projector screen has been described. However, the present invention is not limited to this, and a screen (“curtain”) used for window decoration, partitioning, or the like. It is also possible to apply the present invention.

  In the above-described embodiment, the left end holding member 12, the right end holding member 13, and the center holding member 14 are arranged in the upper horizontal bar 3 at the upper end of the screen body 2. By arranging the holding members 12, 13, 14 also in the lower horizontal bar 4, the expansion action of the screen main body 2 can be more reliably performed. It is preferable to arrange 20A to 20D.

  In the above embodiment, the screen holding member 11 has a three-part configuration including the left end holding member 12, the right end holding member 13, and the center holding member 14. However, the present invention is not limited thereto. However, there may be an example of an integrated configuration without being divided, or an example of a configuration with two or more divisions.

  The screen tensioning device of the present invention can accurately apply a predetermined tensile force to the screen according to the amount of nut tightening operation, and absorbs the elongation even if the screen slightly extends in the lateral direction with use. Since it has the characteristic that it can maintain a state in which a tensile force is applied, the plane of various screens used for projection, projector, rear projection, window decoration, partitioning, etc. It can be suitably used for the purpose of maintaining the property.

1 Screen device 2 Screen body (screen)
3 Upper horizontal bar (horizontal bar)
4 Lower horizontal bar 5, 6 Partition wall 7, 8 Opening (slit)
9, 10 Recess 11 Screen holding member 12 Left end holding member 12a Pulling holding member 12b Pulling piece 12c Height holding holding piece 13 Right end holding member 13a Pulling holding member 13b Pulling piece 13c Height holding Holding piece 14 Central holding member 14a Height holding holding piece 20A to 20D Screen tension device 22 Bolt 23 End plate 23c Nut receiving member 24 Nut 25 End plate 25 Nut receiving member 29 Slack prevention spring 29a Nut receiving member 29b Plate Spring member 31 Slack prevention spring (compression coil spring)
32 Cover material for slack prevention spring 32a Nut receiving member

Claims (5)

A bolt having one end connected to the horizontal end of the screen extending vertically and horizontally, and a nut screwed to the other end of the bolt, and pulling the screen outward in the lateral direction by tightening the nut. Screen tensioning device
A nut receiving member that receives a tightening load from the nut and generates an urging force laterally outward of the screen is disposed on a side of the nut relatively moving with respect to the bolt when the nut is tightened. A screen tensioning device.   The said nut receiving member consists of a plate-shaped elastic body which inclines in the horizontal direction inner side of the said screen in the state elastically deformed by receiving the clamping load from the said nut. Screen tension device.   2. The nut receiving member is made of a plate-like elastic body that is inclined in the laterally outer side of the screen in a natural state before elastic deformation without receiving a tightening load from the nut. The screen tensioning device as described.   The nut receiving member is adapted to generate a biasing force outward in the lateral direction of the screen by being biased outward in the lateral direction of the screen by a leaf spring member utilizing a repulsive force against the bending of the plate-like elastic body. The screen tensioning device according to claim 1. The nut receiving member is urged outward in the lateral direction of the screen by a compression coil spring fitted on the other end of the bolt, thereby generating an urging force laterally outward of the screen. The screen tensioning device according to claim 1.

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