JP2006072291A - Portable screen device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable screen device which is small-sized and light-weight and is easy to handle and has a simple constitution. <P>SOLUTION: The portable screen device has an expansible pole brace which has one end pivoted on a back center part of a casing so as to be able to stand up and fall down and keeps an unrolled screen stretched when standing up. The pole brace is constituted in a nesting structure and consists of a plurality of cylinders capable of mutually sliding to expand/contract, and a first pole brace locking mechanism is provided which engages a cylinder of the next lowest stage, which is slid to expand/contract, with a cylinder of the lowest stage to keep the pole brace at a prescribed height. Furthermore, a pole brace unlocking mechanism is provided which disengages the cylinder of the next lowest stage from the cylinder of the lowest stage in accordance with pedal stepping. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a screen for enlarging and projecting a display image by a projection device such as a projector, and more particularly to a portable screen device that can be easily carried and can be installed on an arbitrary place such as a floor or a table.

  In general, an image from a projector is enlarged and projected on a reflective screen. Among such screens, those that are used by being attached to a ceiling or a wall generally use a screen housed in a storage case by being pulled down electrically or manually as required. In addition, the hanging screen type screen device or the tripod stand type screen device is used by being hung in a predetermined place or placed on the floor.

In recent years, with the increase of conferences in companies or offices, it can be easily carried with projectors, and can be easily installed on a conference room floor, conference desk or table to project images from projectors. There is an increasing demand for portable screen devices of construction. On the other hand, a portable screen in which a screen wound around a spring roll is stored in a storage case has also been proposed. As this portable screen device, a storage case is installed in an arbitrary place, and the screen is pulled up using an elastic force such as a spring by a pantograph, for example, or the screen is locked to a column attached to the storage case. A type (for example, Patent Document 1) has been proposed.
On the other hand, with the spread of projectors for projecting television images, there is an increasing demand for portable screen devices for home use.
Japanese Utility Model Publication No. 6-36048

  However, a portable screen device for home use is required to be smaller and lighter so that it can be carried by women and children. Conventionally, when storing a portable screen device, for example, the screen is first wound and then the column is shortened, or the column is shortened while the screen is locked, and then the screen is removed from the column. A winding method is used. In the former case, for example, after removing the screen from the tip of the column by hand and winding it, the cylinders constituting the column are disengaged and the cylinder is pushed in for shortening. In the latter case, for example, the screen is turned around to the back side of the screen to shorten the column, and then the screen is removed from the tip of the column and wound. However, with the former method, as the screen is enlarged to 80 inches or 100 inches, even adults cannot reach the tip of the column, and the screen cannot be easily detached from the column, making it difficult to store. is there. In the latter method, it is necessary to wrap around the back side of the screen, and when the screen device is installed close to the wall, the screen device needs to be moved or operated in a narrow back side space. There is a problem that the device cannot be easily stored. Therefore, there is also a need for a simple configuration that can easily perform storage operations such as storage of the screen in a storage case and shortening of the columns.

  The present invention has been made in view of such demands and problems, and an object thereof is to provide a portable screen device that is easy to handle with a small, light and simple configuration.

  In order to solve the above problems, a portable screen device of the present invention includes a casing having an opening extending in the longitudinal direction on the upper surface, a spring roll rotatably attached to the casing, and the spring roll when housed. When used, the screen unwound from the opening, one end of the screen is fixed, and when stored, the top bar also serves as a lid for closing the opening, and one end undulates in the center of the back of the casing A portable screen device having a telescopic support that is pivotally supported and that holds the unwound screen in a stretched state when standing up, and a plurality of cylinders that are slidable and extendable by sliding the support against each other A first column locking mechanism that engages the pulled-out next-stage cylinder and holds the column at a predetermined height. Characterized by comprising providing a strut lock release mechanism in conjunction with the depression of the pedal releases the engagement of the lowermost tubular body and its subsequent stage of the cylindrical body.

  In addition, the first column lock mechanism includes an inner periphery of an engagement receiving portion including a through hole provided in an upper end portion of the lowermost first cylindrical body and a lower end portion of the upper second cylindrical body. An engagement projection that is disposed in a recess of the sliding member attached to the surface and engages with the engagement receiving portion, and the engagement portion engages with the through hole; A locking spring body that urges the engaging protrusion.

  Further, the strut lock release mechanism is disposed on the side surface of the pedal mechanism and the lowermost cylinder, and moves forward from the fixed position to the release position or retracts from the release position to the fixed position along the longitudinal direction of the cylinder. A release portion that releases the upper engagement at the release position, and a connecting portion that transmits an operation force from the pedal mechanism and moves the release portion forward and backward along the longitudinal direction of the cylindrical body. it can.

  In addition, the pedal mechanism has a pedal that is pivotally supported around the axis of the casing on the bottom surface of the casing and protrudes to the front, and the strut locking mechanism can be released by depressing the pedal. . The connecting portion includes a transmission member having a support portion supported by a base portion of the lowermost cylinder through a spring body, and a push-up portion that engages with one end of the release portion, and The spring body biases the push-up portion in a direction to return the release portion to the fixed position, and pushes the release portion toward the fixed position by depressing the pedal against the biasing force of the spring body. Can do. The release portion is a release bar disposed on the side surface of the lowermost cylinder so as to be movable in the longitudinal direction of the cylinder, the tip of the release bar is tapered, and the release portion is positioned at the release position. When the head is advanced forward, the tip abuts against the engaging protrusion, and the engaging protrusion is pushed into the concave portion of the sliding member to release the first support lock mechanism.

  In the portable screen device of the present invention, the support column is composed of three cylinders, and has a second column lock mechanism that engages the uppermost third cylinder with the second intermediate cylinder. The second support lock mechanism is provided on the inner peripheral surface of the lower end portion of the upper cylindrical portion of the engagement receiving portion including a through hole provided in the upper end portion of the second cylindrical body. An engagement protrusion that is disposed in the recessed portion of the attached sliding member and engages with the engagement receiving portion, and the engagement portion engages with the through hole; A locking spring body that biases the mating protrusion, and when the first column lock mechanism is released by the stepping on the foot pedal and the first cylinder is lowered, the engagement protrusion of the third cylinder The portion abuts on the tip of the release portion, and the engagement projection is pushed into the recess of the slide member to release the second support lock mechanism. That.

In addition, a piston portion slidable in the first cylindrical body is disposed below the sliding member attached to the inner peripheral surface of the lower end portion of the second cylindrical body, while the base portion of the first cylindrical body is provided. When the first exhaust part is provided, the first cylinder and the second cylinder constitute the first air damper, the second cylinder is lowered and pushed into the first cylinder, the first cylinder The air pressure in the cylinder is temporarily increased to form an air cushion, and the air cushion can decelerate and stop the lowering of the second cylinder. Further, the second exhaust part is provided on the upper part of the sliding member of the second cylindrical body, while the first cylindrical body is provided at the bottom of the sliding member attached to the inner peripheral surface of the lower end part of the third cylindrical body. It is also possible to dispose a piston portion slidable to form a second air damper with the second cylinder and the third cylinder to exhaust the air inside the second cylinder.

  The portable screen device of the present invention can also be provided with a lifting mechanism composed of a gas spring. The elevating mechanism includes a casing having an opening portion extending in the longitudinal direction on the upper surface, a spring roll rotatably attached to the casing, wound around the spring roll when stored, and from the opening portion when used. The screen to be unwound, one end of the screen is fixed, a top bar that also serves as a lid that closes the opening when stored, and one end pivotally supported at the center of the back surface of the casing, and unwound when standing A strut that can be extended and contracted to hold the screen in a stretched state, and can be used for a portable screen device composed of a plurality of cylinders that can slide and extend by sliding the struts. The support column is provided with an elevating mechanism including a gas spring that is disposed in the lower cylinder and moves the upper cylinder of the lower cylinder.

  Here, as the gas spring, a gas spring provided with an upper cylinder, a cylinder that can move integrally in the vertical direction, and a piston rod that can slide in the cylinder in the axial direction can be used. The elevating mechanism further includes one pulley pivotally supported on the upper end portion of the cylinder and a wire hung on the pulley, and fixes one end of the wire to the lower end portion of the piston rod, It is also possible to stretch the wire by fixing the other end to a sliding member disposed on the inner peripheral surface of the lower end of the upper cylinder. Further, the support column is composed of three cylinders, and the lower end of the piston rod is fixed to the upper part of the sliding member of the middle second cylinder, while the lower end of the uppermost third cylinder is fixed. It is also possible to engage the lower end of the cylinder with a sliding member attached to the inner peripheral surface so that the third cylinder moves up and down as the cylinder moves up and down.

  In the portable screen device of the present invention, a hook member is fixed to the center portion of the top bar, while a hook portion is provided at the upper end portion of the support column, and the hook portion is hooked on the hook portion. be able to. Moreover, it is also possible to provide a carrying handle on the top bar and spaced from the hooking member in the extending direction of the lying support column. Moreover, it can also be set as the structure which a hook member serves as a handle for carrying. Further, the hook portion can be attached to the upper end portion of the column so as to be horizontally rotatable, and the hook portion can be rotated and brought into close contact with the casing when the column is lying down.

  In the portable screen device of the present invention, it is possible to provide a lock mechanism for fixing the top bar to the casing during storage. In addition, the lock mechanism is a slide-type lock mechanism, a claw portion is provided at the front end, and a rear end is connected to the rotating shaft via a floating shaft that performs a floating shaft motion. The lid and the engaging portion may be arranged with the opening portion of the casing interposed therebetween. A spring body that holds the lid in an open state can also be provided. The spring body may be wound around the floating shaft and the rotation shaft in an S shape, with one end contacting the casing and the other end contacting the lid.

  According to the present invention, the struts are constituted by a plurality of cylinders that can slide and extend by sliding with each other, and the next-stage cylinder pulled out to the bottom-most cylinder is engaged to hold the struts at a predetermined height. Since the first strut locking mechanism is provided, and the strut lock releasing mechanism for releasing the engagement between the lowermost cylinder and the next cylinder in conjunction with the depression of the pedal is provided. The strut can be shortened by a single operation of stepping on the screen, and the storage operation of the screen device can be easily performed. In particular, by placing the pedal so that it protrudes from the front of the casing, the column can be shortened from the front of the screen, so there is no need to go around the back of the screen, and the storage operation of the screen device is extremely easy. .

  Moreover, since the top bar also serves as the lid of the casing, the lid is not necessary, and the screen device can be further reduced in weight. In addition, since the support column is integrated with the casing and the support column can be raised and lowered, the screen device can be further downsized by overturning the support column during storage. This makes it easy to carry. In addition, the support column can be raised during use and the screen can be extended by extending the support column to the desired height, and when stored, the support column can be shortened and laid down, while the screen is rewound and the top bar is used to cover the opening. This is easy to handle.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 shows an example of a state when the portable screen device according to the present embodiment is used. The portable screen device S1 includes a casing 1 having a pair of caps 1d at both ends, a spring roll (not shown) attached in the casing, and an unwinding portion 1c between the top bar 5 and the spring roll. The extended screen 4 and a column 6 that is erected substantially at the center of the back surface of the casing 1 and holds the screen 4 at a predetermined height. The strut 6 is composed of three-stage cylinders 6a, 6b, 6c that are slidable and extendable and supported by a strut mounting member 12 that is attached to the center of the casing 1, and includes a first strut locking mechanism 8 and a second strut locking mechanism 8. It is held at a predetermined height by the column lock mechanism 9. Moreover, the support | pillar 6 has the hook part 7 which can be rotated horizontally at the front-end | tip, and the handle 11 for carrying also the latching member arrange | positioned in the approximate center of the top bar 5 is attached to the hook part 7. The screen 4 is suspended and hung. Reference numeral 10 denotes a lock mechanism for fixing the top bar 5 to the casing 1 and engages with an engaged portion (not shown) disposed in the casing 1 when stored. Further, the screen device S1 is supported so as to stand upright by a pair of legs 3 drawn from the bottom of the casing 1.
In the present invention, the projection surface of the screen is the front surface of the screen, and for the casing, the projection surface side of the screen is the front surface of the casing, and the back surface side of the screen is the back surface of the casing.

  FIG. 2 shows an example of the structure of the portable screen S1 in a state where the screen 4 has been rewound for storage. The screen 4 released from the hook 7 is unwound and accommodated in the casing 1. The top bar 5 serves as a lid and closes the opening of the casing 1. FIG. 3 shows an example of the structure of the portable screen S1 during storage. The support column 6 is turned down around the lower end pivotally supported by the support mounting member 12. Thereby, the support | pillar 6 is accommodated in the state which made the whole support | pillar parallel to the casing 1. FIG. The top bar 5 is fixed to the casing when the lock mechanism 10 is engaged with an engaged portion (not shown) provided in the casing 1. Moreover, the pedal 17a which is a part of support | pillar lock cancellation | release mechanism is arrange | positioned in the front center part of a casing so that it may protrude.

  4 is a longitudinal sectional view taken along line IV-IV in FIG. The casing 1 is composed of a first case member 1a and a second case member 1b extending in the longitudinal direction. One end in the longitudinal direction of the two case members is connected to be opened and closed by a one-side hinge mechanism, and the other end is spaced apart from each other to form an opening 1c for unwinding the screen. Here, the first case member 1a on the front side of the casing has a curved structure that bulges toward the projector side, and the second case member 1b on the back side has an L-shaped cross section. As a result, the spring roll 2 around which the screen 4 is wound can be accommodated in the casing 1, and the opening 1 c can be narrowed to reduce the size of the casing 1. In addition, an aluminum extrusion material can be used for the case member. In addition, the casing is not limited to use by connecting the first case member and the second case member separately, and an integrally formed casing can also be used.

  FIG. 4 is a cross-sectional view of one end of the longitudinal edge of the second case member 1b, while one end of the longitudinal edge of the first case member 1a is curved into a fitting recess 130. An example is shown in which a one-side hinge structure is formed by fitting the fitting protrusion 131 into the fitting recess 130 by fitting the fitting protrusion 131 into a generally D-shaped fitting protrusion 131. On the other hand, the fitting protrusion 131 is circular in cross section, and the fitting protrusion 131 is slid and fitted into the fitting recess 130 from the longitudinal direction of the first case member 1a or the second case member 1b, and the one-side hinge. A structure can also be formed. However, it is preferable to use the D-shaped fitting protrusion 131 because the first case member 1a and the second case member 1b can be easily integrated by a pushing operation.

  A column attachment member 12 that pivotally supports the column 6 is attached to the back surface of the casing 1. The column attachment member 12 is fastened and fixed to the bottom of the casing 1 by rivets 14 and 15. On the bottom surface of the casing, there is disposed a pedal mechanism 17 that is pivotally supported around the axis of the casing and in which a pedal 17a projects to the front side of the casing. As shown in the schematic plan view of FIG. 5, the pedal mechanism 17 includes a pedal 17a at one end, a swinging portion 17c that is formed of a narrow projecting piece at the other end, and swings up and down, and swings with the pedal 17a. It has a shaft portion 17b for interlocking with the portion 17c. Further, the swinging portion 17c has a push-up portion 17d that operates a release portion described later, and a first spring locking portion 17e that locks one end of a return spring 17f that applies a restoring force to the pedal. . At the time of storage, the other end of the return spring is locked to a second spring locking portion (not shown) provided on the column mounting member, and the pedal returns to the standby position by the urging force of the return spring.

  As the lock mechanism for fixing the top bar to the casing, for example, a slide type lock mechanism can be used. The lock mechanism 10 includes a lid body 10a having a claw portion 101a at one end and an engagement portion 12a that engages with the claw portion 101a. The lid body 10a and the engagement portion 12a are arranged with an opening of the casing interposed therebetween. It is installed. The engaging part 12a should just be arrange | positioned facing the cover body on both sides of the opening part of a casing, For example, the protrusion provided in the edge of the support | pillar attachment member of the back side of a casing can be used. The lid 10a has a claw portion 101a at the tip, and the rear end is connected to a rotating shaft 10c via a floating shaft 10b that performs a floating shaft motion. The rotating shaft 10c is fixed to the casing by a rivet 16. When releasing the locking mechanism, the rear end of the lid body 10a is pushed forward to release the engagement between the claw portion 101a and the engaging portion 12a, and the lid body 10a is moved backward by rotating about the pivot shaft 10c. Let For example, in FIG. 4, the lid 10a is rotated counterclockwise. At this time, the lid body 10a moves backward while sliding and returns to the standby position by the idle shaft 10b that performs idle shaft motion. On the other hand, when locking the lid body, the lid body is pushed out from the standby position and advanced until the lid body covers the engaging portion, and then the lid body is retracted to the locking position to engage the claw portion and the engaging portion. Combine.

Here, the lock mechanism may be provided with a spring body that holds the lid in an open state. 6A and 6B are schematic cross-sectional views showing the operation of the lock mechanism provided with the spring body. FIG. 6A is a fixed state, that is, the lid is fixed, and FIG. 6B is a released state, that is, the lid is released. Indicates the state that has been performed. The spring body 10d is wound around the floating shaft 10b and the rotation shaft 10c in an S shape, one end abuts on the first case member 1a, and the other end abuts on the lid 10a. In the fixed state, due to the engagement between the claw portion 101a and the engaging portion 12a, the other end of the spring body 10d is brought into contact with the lid body 10a while being elastically deformed by the pressing force of the lid body 10a. On the other hand, when the engagement between the claw portion 101a and the engaging portion 12a is released, the other end of the spring body 10d is released from elastic deformation and the lid body 10a rotates around the floating shaft 10b as a fulcrum, but the spring body that comes into contact with it. The open state of the lid 10a is maintained by the urging force of 10d. Therefore, when the lock mechanism is released, the lid body does not cover the top bar, so that the handle can be easily grasped.
The locking mechanism is not limited to the above-described sliding type locking mechanism, and various types of locking mechanisms can be applied as long as the engaging members are engaged with each other with the opening of the casing interposed therebetween. it can.

  FIG. 7 corresponds to a schematic longitudinal sectional view taken along the line VI-VI in FIG. 2, and shows a state where the column is raised and the pedal is depressed. FIG. 8 is a schematic cross-sectional view of the support in FIG. FIG. 9 is a schematic enlarged cross-sectional view of the piston portion. A support member 18 is fitted to the bottom of the first cylinder 6a. The support member 18 has a top 18a fitted to the first cylinder 6a and a bottom, and the bottom is a support column. It has a shaft portion 18c that is pivotally supported by the mounting member, and a base portion 18b that supports the shaft portion.

  On the other hand, the first strut locking mechanism 8 has the sliding member 22 attached to the inner peripheral surface of the lower end portion of the second cylindrical body 6b, and the recess member 8b of the sliding member 22 has an engaging member 81a, A cylindrical body engaging portion 8a having one end engaged with the recess 8b and the other end engaged with the engaging member 81a, and a spring body 82a that urges the engaging member 81a is disposed. On the other hand, a through hole 62a is formed in the longitudinal direction at the upper end of the first cylinder 6a, and this through hole constitutes a cylinder engagement receiving part that engages with the cylinder engaging part 8a. ing. The engaging member 81a has a ball-shaped protrusion at its tip, and is pressed by the spring member 82a so that the ball-shaped protrusion engages with the through hole 62a, and the second cylindrical body 6b is fixed. In order to release the engagement, the ball-shaped protrusion is directly pressed against the urging force of the spring member 82a, or the second cylinder 6b is pushed down to indirectly push the ball-shaped protrusion into the recess 8b. Can be used. Here, metallic or resin-made ones can be used for the ball-shaped protrusions, but it is preferable to use one made of resin. Further, the edge of the through hole is rounded, or a taper that extends toward the second cylindrical body 6b is provided. Thereby, the frictional force between the through hole and the engaging member can be reduced. Therefore, the engagement can be easily released by pulling out or pushing in the second cylinder 6b from the first cylinder 6a without directly pressing the ball-shaped protrusion. An outer peripheral groove is formed in the sliding member 22, and a sliding ring 30 that also serves as a packing is disposed in the outer peripheral groove.

  The strut lock release mechanism 13 includes a pedal mechanism 17, a release portion 20 disposed on the side surface of the first cylinder 6 a so as to be movable in the longitudinal direction of the cylinder, and an operating force of the pedal mechanism 17 to the release portion 20. For example, a long release bar can be used as the release portion. On the other hand, the connecting portion is composed of an engaging end 19b that engages with the engaged portion 20a at the lower end of the release bar 20, and a connecting member 19 that has a support member 19a that supports the engaging end 19b. . For example, the connecting portion is configured by an L-shaped connecting member, and one end of a release spring 19c that urges the engaging release bar toward the bottom of the cylinder is engaged with one end thereof. The release spring 19c is accommodated in a recess 18d provided in the base 18b of the support column support member 18, and the other end is also engaged in the recess. When the pedal 17a is depressed, the push-up portion abuts against the support member 19a of the connecting member 19 against the urging force of the return spring 17f, and presses the support member 19a upward against the urging force of the release spring 19c. Accordingly, the release bar 20 that engages with the connecting member 19 is also pushed upward and advances in the longitudinal direction along the side surface of the first cylindrical body. The release bar 20 has an upper end portion 20b having a tapered cross section, and when the release bar 20 is advanced to a release position where the upper end portion 20b abuts on the ball-shaped protrusion of the first column lock mechanism 8, the upper end portion The ball-like protrusion is pushed into the recess 8b by 20b, and the first support lock mechanism is released. FIG. 7 shows a state in which the screen is accommodated. In use, the screen is locked to the hook portion of the support column. When the first support lock mechanism is released, the second cylindrical body 6b is loaded by the load of the screen. Descends and is accommodated in the first cylinder 6a.

  In addition, when the 2nd cylinder 6b descend | falls, the 2nd cylinder 6b and the 1st cylinder 6a comprise an air damper, and the 2nd cylinder 6b is decelerated and it descends gradually. Can do. That is, as shown in FIG. 7, the piston portion 21 that can slide in the airtight state in the first cylindrical body is disposed below the sliding member 22 disposed in the lower end portion of the second cylindrical body 6b. A first exhaust part 28 is provided on the support member 18 at the bottom of the first cylinder, and the air inside the first cylinder 6a is confined by the piston part 21 to constitute a first air damper. The first exhaust portion 28 is formed in the top portion 18a of the support member 18 along the axial direction and opens toward the inside of the first cylindrical body 6a, and the exhaust hole 181a via the communication hole 182a. A leak groove 183a that communicates with the leak groove and a leak valve 184a that is screwed into the leak groove are formed. A leak hole (not shown) is formed in the leak valve 184a, and the amount of exhausted air can be changed by changing the screwing amount of the leak valve. The piston portion 21 is attached to the bottom portion of the sliding member 22 and is attached to the reverse tapered rod 21a having a small diameter on the first cylindrical body side and the lower end portion of the rod 21a. The piston packing 21b is in sliding contact with the inner peripheral surface of 6a, and one or more cushion rings 21c are movably held between a pair of annular protrusions 21d formed on the rod 21a. As shown in FIG. 9, the piston packing 21b is made of a truncated cone-shaped flexible material having a shaft hole 211b at the center, and is provided with a play gap so as to be rotatable and movable in the axial direction. It is pivotally supported by 21a. Around the shaft hole 211b, a plurality of protrusions 212b are erected, and the protrusions 212b prevent the piston packing 21b from coming into contact with the support member 21d. When the second cylindrical body descends, the piston packing moves in the axial direction upward, comes into close contact with the rod, and presses the air in the first cylindrical body. On the other hand, when pulling out the second cylindrical body, the piston packing moves downward in the axial direction to release contact with the rod. At this time, since the projecting portion prevents contact with the support member, the air in the first cylinder moves through the shaft hole, and the air pressure in the first cylinder is lowered to easily pull out the second cylinder. Can do.

  The cushion ring 21c slides with the inner peripheral surface of the first cylinder and increases the braking force of the piston portion. For example, an o-ring can be used. The cushion ring 21c is held so as to be vertically movable between a pair of annular protrusions 21d formed on the rod 21a. When the second cylindrical body is pushed in, the cushion ring 21c is in close contact with the large diameter portion of the reverse tapered rod. The friction force with the inner peripheral surface of the first cylinder is increased by being held. On the other hand, when pulling out the second cylindrical body, the cushion ring moves to the small diameter portion of the rod and is released from close contact with the rod, thereby reducing the frictional force with the inner peripheral surface of the first cylindrical body. As a result, the second cylinder slowly descends during storage, and the second cylinder can be easily pulled out during use. In order to enhance the braking effect, a plurality of cushion rings can be used. In that case, what is necessary is just to provide three or more annular protrusions.

  Further, it is preferable to apply a lubricant such as oil or grease to the lower portion of the sliding member 22. Since the lubricant reduces the friction between the sliding member and the first cylindrical body, the struts can be expanded and contracted more easily.

  Here, when the second cylindrical body 6b is lowered and pushed into the first cylindrical body 6a, the air pressure in the first cylindrical body is temporarily increased to become an air spring, and the air spring is the second cylindrical body 6b. Acting as a braking force against the descent, the second cylinder 6b is gradually lowered. For this reason, even if the first support lock mechanism is released, the second cylinder does not suddenly fall and collide with the bottom of the first cylinder to generate an impact sound. Further, a desired lowering speed can be obtained by changing the screwing amount of the leak valve. On the other hand, when the second cylindrical body 6b is pulled out from the first cylindrical body 6a, air flows in from the leak groove, so that the second cylindrical body 6b cannot be prevented from being pulled out.

  Further, as shown in FIG. 8, a second exhaust part 29 is provided at the upper part of the sliding member 22, and a piston part (slidable in an airtight state in the second cylindrical body at the lower part of the third cylindrical body ( (Not shown) is provided to constitute a second air damper. As the piston portion of the second air damper, a piston portion having the same structure as that used in the first air damper can be used except that the exhaust portion is not provided. The second exhaust part 29 is formed in the upper part of the sliding member 22 along the axial direction and opens toward the inside of the second cylinder 6b, and the exhaust hole 22a via the communication hole 22c. The leak groove 22b communicates with the leak groove 22b. The leak valve 22d is screwed into the leak groove 22b. The second exhaust part draws air trapped between the sliding member 22 of the second cylinder 6b and the third cylinder 6c from the gap between the first cylinder 6a and the second cylinder. Has the role of exhausting. When the amount of air trapped between the first cylinder and the piston portion decreases as the second cylinder descends, the descending speed of the second cylinder increases from the middle, generating an unpleasant frictional sound. In some cases. However, when the air trapped between the sliding member 22 of the second cylindrical body 6b and the third cylindrical body 6c is exhausted from the second exhaust section, the descending speed increases from the middle. Since the second cylinder can be lowered at a substantially constant speed, no unpleasant frictional sound is generated. Note that a leak hole (not shown) is formed in the leak valve 22d, and the amount of exhausted air can be changed by changing the screwing amount of the leak valve.

  FIG. 10 is a schematic exploded perspective view showing an example of the configuration of the hook portion 7. The hook portion 7 includes a hook member 71 having a latching portion 71a for latching the handle 11 on the side, and a swinging member 24 disposed in the latching portion 71a and engaged with the upper end portion of the second cylindrical body. A support portion 72 that is concentrically inserted into the hook member 71 and supports the hook member 71 so as to be horizontally rotatable, and a connecting cap 25 that connects the support portion 72 and the hook member 71. The support part 72 has a pair of protrusions 72c facing the inner peripheral surface thereof, and the protrusions have a sliding protrusion 72a on the upper surface 72b. An engagement hole 61c is formed in the upper end portion of the second cylinder 6b. The support portion 72 is externally fitted to the upper end portion of the second cylinder 6b, and the protrusion 72c is engaged with the engagement hole 61c. Let Thereby, the support part 72 is fixed to the upper end part of the 2nd cylinder 6b. On the other hand, the support portion 72 is externally fitted to the support portion 72 so that the sliding protrusion 72 a is positioned in the guide groove 71 b provided in the circumferential direction of the ceiling portion 71 c of the hook member 71. The sliding protrusion 72a reciprocates in the guide groove 71b, thereby rotating the hook member 71 between the use position and the storage position.

FIG. 11 is a schematic cross-sectional view of a support column in a state where the support column is extended to be the longest.
The second strut locking mechanism 9 has a sliding member 27 attached to the inner peripheral surface of the lower end portion of the third cylindrical body 6c, and an engaging member 91a and one end are provided in the concave portion 9b of the sliding member 27. A cylindrical body engaging portion 9a is disposed which is engaged with the concave portion 9b and is engaged with the engaging member 91a at the other end, and a spring member 92a for biasing the engaging member 91a. In contrast, a through hole 62b is formed in the longitudinal direction at the upper end of the second cylinder 6b, and this through hole constitutes a cylinder engagement receiving part 62b that engages with the cylinder engaging part 9a. is doing. The engaging member 91a has a ball-shaped protrusion at its tip, and is pressed by the spring body 92a so that the ball-shaped protrusion engages with the through hole 62b, and the third cylindrical body 6c is fixed. To release the engagement, a method of pressing the ball-shaped protrusion against the urging force of the spring body 92a can be used. Here, metallic or resin-made ones can be used for the ball-shaped protrusions, but it is preferable to use one made of resin. Further, the edge of the through hole 62b is rounded, or a taper that extends toward the third cylindrical body 6c is provided. Thereby, the frictional force between the through hole and the engaging member can be reduced. Therefore, the engagement can be easily released by pulling out or pushing in the third cylinder 6c from the second cylinder 6b without directly pressing the ball-shaped protrusion.

  On the other hand, FIG. 12 is a schematic longitudinal sectional view showing a state in which the third cylinder is engaged and fixed to the second cylinder. The third support lock mechanism 23 is configured by a swing member 24 supported so as to be swingable in the vertical direction in a hooking portion 71a of the hook member, and a spacer member 61b fitted to the third cylinder 6c. The The swing member 24 has a claw portion 24c that engages with the annular protrusion 611b at the tip of the spacer member 61b at one end, a release lever 24a at the other end, and a shaft that supports the claw portion 24c and the release lever 24a so as to be interlocked with each other. It has a portion 24b. Furthermore, the other end of the release spring 24d whose one end is engaged with the latching portion is engaged with the shaft portion 24b. When the third column lock mechanism is in the activated state, the hook member and the second and third cylinders can be moved together via the swing member and the coupling cap. That is, when the column is extended, the second cylinder is pulled out from the first cylinder, but if the hook portion is grasped and pulled up, the second cylinder and the third cylinder can be pulled out simultaneously. After the second cylinder is locked by the first support lock mechanism, the release lever is pushed in to release the engagement between the claw and the annular protrusion of the spacer member. Next, the third cylindrical body is pulled out by grasping the hook portion and locked by the second support lock mechanism to fix the third cylindrical body.

  In order to push in the release lever, it can be pushed directly by hand, but a separate release arm 26 can also be used. FIG. 13 shows a schematic plan view (a) and a schematic side view (b) of the release arm. The release arm 26 has an arm portion 26b and a V-shaped release portion 26a formed at the tip of the arm 26b, and presses the projection 26c provided in the recess of the release portion against the release bar to And the annular protrusion of the spacer member can be released. Note that the release arm can be detachably attached to a place other than the column storage portion on the back surface of the casing, for example.

The operation of the portable screen device according to the present embodiment will be described below.
When not in use, as shown in FIG. 3, the support column is tilted and stored so as to be substantially parallel to the casing. The top bar is fixed to the casing as a lid of the casing and is extremely easy to store and carry. Further, the hook portion at the tip of the support column is rotatably supported by the support column.

In use, the column is raised as shown in FIG. Next, the second and third cylinders are pulled out from the first cylinder, but the second and third cylinders can be pulled out at a time by grasping and pulling up the hook portion. After the first column lock mechanism is locked and the second cylinder is engaged with the first tube, the third column lock mechanism of the hook portion is released, and the third cylinder is Then, the second column lock mechanism is locked, and the third cylinder is engaged with the second cylinder. Thereby, the extension of the column ends.
Next, when the lock mechanism of the top bar is released, the handle is grasped and the top bar is pulled upward, the screen is unwound from the spring roll against the elastic force and gravity of the spring attached to the spring roll. Subsequently, the screen is held in a stretched state by hooking a handle disposed on the top bar to the hook portion of the column.

  On the other hand, when storing, when the pedal is stepped on with the handle hooked on the hook portion, the first column lock mechanism is released and the second cylinder is lowered. Since the second cylinder constitutes an air damper, the second cylinder descends slowly. Further, the third cylindrical body has its engaging projection abutted against the tip of the release portion, and the engagement projection is pushed into the concave portion of the sliding member to release the second column lock mechanism, The cylinder is lowered and accommodated in the second cylinder, and the shortening of the column is completed. After the second cylindrical body is lowered, the screen is removed from the hook portion, and the top bar is stored on the opening portion as it is. Next, the top bar is fixed to the casing using a sliding lock mechanism. The support column is stored so that the hook portion is turned parallel to the casing after being turned so that the hook portion does not protrude to the periphery.

In addition, the portable screen device of the present invention includes devices including modifications of the constituent members described below.
FIG. 14 shows a first modification of the sliding member 22 of FIG. In this modification, a braking mechanism 31 is used instead of the cushion ring. The brake mechanism 31 includes a columnar flexible member 31d housed in a recess provided in the lower portion of the sliding member 22, and a swing that presses the flexible member and contacts the inner surface of the first cylindrical body. A piece 31c, a spring body 31b that has one end engaged with the swinging piece and presses the flexible member, and a screw member 31a that is engaged with the other end of the spring body and screwed into the recess. It is composed of When the screw member is screwed in, the swing piece pressed by the spring body brings the flexible member into contact with the inner surface of the first cylinder. Thereby, the frictional force between the flexible member and the first cylinder increases, and the braking force of the piston portion can be increased. The present modification has a feature that the braking force of the piston portion can be adjusted by changing the screwing amount of the screw member.

  FIG. 15 shows another modification 2 of the sliding member 22 of FIG. In this modification, a brake mechanism 32 that is separate from the sliding member 22 is used instead of the cushion ring. The braking mechanism 32 includes a cap member 32c that is fitted to the outer periphery of the upper end of the first cylinder and has a female screw on the outer peripheral surface, a screw member 32d that is disposed outside the cap member and is screwed with the cap member, and a screw member A cover member 32a that engages with the cap member to protect the cap member, and a pair of columnar flexible members 32b that are disposed to face each other through the second cylinder in the gap between the cap member and the cover member. It is configured. When the screw member is screwed in, the pair of flexible members abut on the outer peripheral surface of the second cylindrical body, and the frictional force between the flexible member and the second cylindrical body increases, and the braking force of the piston portion is increased. Can be increased. The present modification has a feature that the braking force of the piston portion can be adjusted by changing the screwing amount of the screw member.

  FIG. 16 shows a first modification of the lock mechanism of FIG. In this modification, the belt member has one end fixed to one side surface of the casing 1 and the other end detachably fixed to the other side surface of the casing 1 so as to straddle the top bar 5. As shown in FIG. 15, the handle 40 is fixed to the approximate center of the top bar, and the free end of the belt member 44 is detachably fixed by a fixing member 45 fixed to the side surface of the casing across the top bar. Yes. According to this modification, the lock mechanism can be configured simply, so that a lower cost portable screen device can be provided.

  FIG. 17 shows another modification 2 of the lock mechanism. In this modification, an example in which a pair of belt members is used for the lock mechanism is shown. This modification has a pair of belt members 46 and 47 with one end fixed to one side surface of the casing 1 and the other end detachably fixed to the other side surface of the casing 1 so as to straddle the top bar 5. is doing. The free ends of the belt members 46 and 47 are detachably fixed to fixing members 48 and 49 fixed to the other side surface of the casing 1. The handle 41 is substantially at the center of the casing 1 and is fixed between the fixing members 48 and 49, and a hooking member 43 for locking is fixed at the center of the top bar 5. According to this modification, the top bar can be more securely fixed to the casing by using a simple structure of the lock mechanism and using the pair of belt members.

  FIG. 18 shows another modification 3 of the lock mechanism. In this modification, an example in which a pair of belt members integrated with a handle is used for the lock mechanism is shown. This modification has a pair of belt members 50 and 51 having one end fixed to one side surface of the casing 1 and the other end detachably fixed to the other side surface of the casing 1 so as to straddle the top bar 5. is doing. The free ends of the belt members 50 and 51 are detachably fixed to fixing members 52 and 53 fixed to the other side surface of the casing 1. Both ends of the handle 42 are pivotally supported by a pair of belt members 50 and 51 so as to be rotatable. Further, a hooking member 43 for fastening is fixed to the center of the top bar 5. According to this modification, the top bar can be more securely fixed to the casing by using a simple structure of the lock mechanism and using the pair of belt members.

Embodiment 2. FIG.
Similar to the portable screen device of the first embodiment, the portable screen device according to the present embodiment has a column lock release mechanism for releasing the engagement between the first cylinder and the second cylinder. Is common, but instead of the second air damper used in the first embodiment, a gas spring is disposed in the second cylinder, and a hook member and a handle are provided on the top bar. The difference from the portable screen device according to the first embodiment will be mainly described.
FIG. 19 and FIG. 20 are a schematic front view and a schematic back perspective view showing an example of a state when the portable screen device S2 according to the present embodiment is used. The screen 4 having the projection surface 4a is held in a stretched state by a column 6 having a hook portion 7 which is erected on the back surface of the casing 1 via a column mounting member 112 and can be horizontally rotated at the tip. A hooking member 110 is disposed in the approximate center of the top bar 5 via an attachment member 111, and the screen 4 is suspended by hooking the hooking member 110 on the hook portion 7. Further, at a position away from the center of the casing 1, a carrying handle 114, a lock mechanism 113 that fixes the top bar 5 to the casing 1, an engaged portion 115 that engages with the lock mechanism 113, and a column A pedal 116a, which is a part of the unlocking mechanism, is provided.

  FIG. 21 shows an example of the structure of the portable screen S2 during storage. The column 6 is turned down by rotating around the lower end pivotally supported by the column mounting member 112. Thereby, the support | pillar 6 is accommodated in the state which made the whole support | pillar parallel to the casing 1. FIG. The top bar 5 is provided with a carrying handle 114 that is separated from the hooking member 110 in the extending direction of the column 6 lying down from the center thereof. The top bar 5 is fixed to the casing 1 when the lock mechanism 113 engages with the engaged portion 115 disposed in contact with the casing 1. Moreover, the pedal 116a is arrange | positioned at the bottom part of the casing 1 so that it may protrude from the downward direction of the to-be-engaged part 115. FIG. In general, when the handle is provided in the center of the top bar, the horizontal balance of the screen device is lost due to the weight of the sloping support and the screen device tilts forward or backward, so extra force is required when carrying the stored screen device. Cost. However, if the handle is provided near the upper part of the center of gravity of the screen device, the horizontal balance is maintained, so that the screen device can be easily carried.

  22 is a longitudinal sectional view taken along line XXII-XXII in FIG. A column attachment member 112 that pivotally supports the column 6 is attached to the back surface of the casing 1. The column attachment member 112 is fastened and fixed to the bottom of the casing 1 with rivets 14 and 15. On the bottom surface of the casing, there is disposed a pedal mechanism 116 that is pivotally supported around the axis of the casing and in which a pedal 116a projects to the front side of the casing. As shown in the schematic perspective view of FIG. 23, the pedal mechanism 116 has a pedal 116a at one end, a swinging portion 116c that is a narrow projecting piece at the other end, and swings in the vertical direction. It has a shaft part 116b for interlocking with the part 116c. Further, the swinging portion 116c has a push-up portion 116d that operates a release portion, which will be described later, and a first spring locking portion 116e that locks one end of a return spring (not shown) that applies a restoring force to the pedal. is doing. At the time of storage, the other end of the return spring is locked to a second spring locking portion (not shown) provided on the column mounting member, and the pedal returns to the standby position by the urging force of the return spring.

  One end of the lock mechanism 113 for fixing the top bar to the casing is pivotally supported by the casing, and the other end forms a free end. At the time of operation, the free end engages with the engaged portion 115 facing the opening portion to lock the lock mechanism 113. The engaged portion 115 is disposed on the surface of the first case member 1a, one end of which is fastened to the bottom of the casing 1 by a rivet 14, and the other end is a first case member 1a by a rivet (not shown). It is fastened and fixed to. Note that the locking mechanism is not limited to the locking mechanism, and various types of locking mechanisms can be used as long as the sliding locking mechanism of the first embodiment or the engaging members are engaged with each other across the opening of the casing. Can be applied.

  FIG. 24 is a schematic longitudinal sectional view showing an example of the screen device using the lifting mechanism, and shows a state before the column is raised and the third cylinder 6c is pulled out from the second cylinder 6b. The elevating mechanism includes a gas spring 120 having a cylinder 120a and a piston rod 120b that is slidable in the axial direction within the cylinder, a pulley part 121 having a pulley supported on the upper end of the cylinder 120a, and a pulley. It is composed of the passed wire 122. The gas spring 120 is disposed in the second cylinder 6b so that the cylinder 120a is on the upper side, and the outer end of the piston rod 120b is attached to the inner peripheral surface of the lower end of the second cylinder 6b. The cylinder 120a is fixed to the sliding member 124 and can move up and down. The pulley part 121 includes a single pulley 121a that is pivotally supported on the upper end of the cylinder 120a and a pulley cover 120b that protects the pulley. One end of the wire 122 hung on the pulley is fixed to the sliding member 124 that fixes the outer end of the piston rod 120b, and the other end is attached to the lower end of the third cylinder. 123 is fixed and stretched. Here, the pulley portion is preferably attached to a bracket provided at the upper end portion of the cylinder.

In the gas spring, high-pressure gas is sealed inside the cylinder via a piston having an orifice, and volume change in the cylinder accompanying expansion and contraction of the piston rod is detected indirectly or directly via oil. It is adjusted by change. In the state of FIG. 24, as will be described later, the third cylinder is in a state of being engaged and fixed to the second cylinder, and the other end of the wire is pulled downward, so that the tensile force is It acts as a compressive force that pushes the piston rod into the cylinder against the repulsive force caused by the gas pressure in the cylinder. On the other hand, when the engagement between the third cylinder and the second cylinder is released, the other end of the wire is pulled upward by the repulsive force due to the gas pressure in the cylinder, so that the third cylinder is integrated with the cylinder. And is pulled out from the second cylinder. Also, when storing the third cylinder, when the third cylinder is pushed in, the other end of the wire is pulled downward and the cylinder descends, but a repulsive force is generated by the gas pressure in the cylinder, The third cylinder can be lowered gently and smoothly.
Here, by extending the wire over one pulley, it is possible to obtain a lifting stroke that is twice the expansion / contraction stroke of the gas spring. Thereby, since the raising / lowering stroke of a 3rd cylinder can be enlarged without being restrict | limited to the expansion-contraction stroke of a gas spring, it can use suitably for large screens, such as 100 inches.

  On the other hand, the third support lock mechanism for integrally moving the second cylindrical body 6b and the third cylindrical body 6c includes a swinging member 117 disposed in the hook portion 7, and a third cylindrical body. And a lock member 118 disposed inside the upper end of 6c. Here, the hook portion 7 is concentrically fitted to the hook member 71, the first swinging member 117 for releasing the engagement between the second cylindrical body 6b and the third cylindrical body 6c, and the hook member 71. A support portion 72 that is inserted and supports the hook member 71 so as to be horizontally rotatable, and a connecting cap 25 that connects the support portion 72 and the hook member 71 are provided.

  The swing member 117 is supported on the inner side of the hook member 71 so as to be swingable in the vertical direction, and has a contact protrusion 117b at one end, a release lever 117a at the other end, a contact protrusion 117b, and a release lever 117a. The shaft portion 117c is supported so as to be interlocked. Furthermore, the other end of a biasing spring 117d whose one end is engaged with the hook member 71 is engaged with the shaft portion 117c. The shaft portion 117c has an engaging protrusion 117e. When the screen is not used, the shaft portion 117c engages with an engaging hole 71d provided in the hooking portion 71a shown in FIG. 25 to hook the swinging member 117. Secure to member 71. In this state, the release lever 117a is accommodated in the hook member 71, and the release lever 117a cannot be operated. In order to release this engagement, the hook member 110 may be hooked on the hook portion 71 a of the hook member 71. The protrusion 110a below the hooking member 110 pushes down the engagement protrusion 117e, and the engagement between the engagement protrusion 117e and the engagement hole 71d is released. Then, the swinging member 117 swings downward and the release lever 117a protrudes below the hook member 71, so that the release lever 117a can be pushed down by a finger pressing operation.

  Further, the lock member 118 has an engagement protrusion for engaging the second cylinder 6b and the third cylinder 6c, and the third cylinder is disposed inside the upper end of the third cylinder 6c. It is pivotally supported so that it can swing in the radial direction of the body. That is, the lock member 118 has an upper first engagement protrusion 118a and a lower second engagement protrusion 118b that are linearly formed in the vertical direction of one surface thereof. An upper first engagement hole 62c and a lower second engagement hole 63c are linearly formed in the vertical direction of the third cylindrical body, and the first engagement protrusion 118a is a first engagement hole. The second engagement protrusion 118b engages with the second engagement hole 63c. Further, one end of the second swinging member is engaged with the inner surface of the third cylindrical body and biased so as to engage the second engagement protrusion 118b with the second engagement hole 63c. The other end of the bias spring 118c is engaged. The second engagement hole 63c of the third cylinder is aligned in a state where the third cylinder is pushed into and stored in the second cylinder, and the second cylinder, the spacer member 61b, and the third cylinder are aligned. Part of the engaging hole 132 that penetrates the cylindrical body 6c.

  When the third column lock mechanism is in the activated state, the hook member 71 and the second and third cylinders 6b and 6c can be moved integrally through the swing member 117 and the connecting cap 25. . That is, when the column is extended, the second cylinder 6b is pulled out from the first cylinder 6a, but if the hook portion 7 is grasped and pulled up, the second cylinder 6b and the third cylinder 6c are simultaneously moved. It can be pulled out. Next, in order to pull out the third cylinder 6c from the second cylinder 6b, the release lever 117a of the swing member 117 may be pushed down. That is, in the state where the hook member 110 is hooked on the hook portion 71a of the hook member 71 as described above, the release lever 117a protrudes below the hook member 71, so that the release lever 117a can be easily operated by pushing the finger. Can be pushed down. When the release lever 117a is pushed down, the abutting protrusion 117b of the swinging member 117 abuts on the first engaging protrusion 118a of the lock member 118 and is pushed into the third cylinder 6c. At this time, the lock member 118 is pushed. Oscillates inside the third cylindrical body 6c against the biasing force of the spring member 118c, and the engagement between the second engagement protrusion 118b and the engagement hole 132 is released. As a result, the other end of the wire is pulled upward by the repulsive force caused by the gas pressure in the cylinder of the gas spring, whereby the third cylinder rises integrally with the cylinder and is pulled out from the second cylinder. Here, when the third cylinder 6c is pulled out from the second cylinder 6b, if the screen is hung on the hook portion, when the release lever is pushed down, the screen automatically expands as the third cylinder rises. Is done. In addition, since the lowering of the third cylinder is suppressed by the repulsive force due to the gas pressure in the cylinder of the gas spring, in the present embodiment, the third cylinder is fixed to the second cylinder. The two support lock mechanisms can be omitted.

  The screen device according to the present embodiment also has a first air damper that decelerates and gradually lowers the second cylindrical body 6b as in the case of the first embodiment. That is, as shown in FIG. 24, while the piston portion 125 that can slide in the airtight state in the first cylinder is provided below the sliding member 124 provided in the lower end of the second cylinder 6b. A first exhaust part (not shown) is provided on the support member at the bottom of the first cylinder, and the air inside the first cylinder 6a is confined by the piston part 125 to constitute a first air damper. The piston portion 21 is attached to the reverse tapered rod 125a attached to the bottom portion of the sliding member 124, the annular protrusion 125b formed on the rod 125a, and the lower end portion of the rod 125a. The piston packing 21b is in sliding contact with the inner peripheral surface of the cylindrical body 6a. Since the structure of the first exhaust part and the operating mechanism of the first air damper are the same as those in the first embodiment, description thereof is omitted.

The operation of the portable screen device according to the present embodiment will be described below.
When using, first erect the column. Next, the second and third cylinders are pulled out from the first cylinder, but the second and third cylinders are pulled out at a time by locking the first support lock mechanism by grasping and pulling the hook portion. Then, the second cylinder is engaged with the first cylinder. Next, when the hook member provided on the top bar is hooked on the hook part and the release lever of the hook part is pushed down, the engagement between the second cylinder and the third cylinder is released, and the gas in the cylinder of the gas spring is released. Due to the repulsive force due to the pressure, the third cylinder is automatically raised and pulled out from the second cylinder, and the screen unwound from the spring roll is expanded. Since the lowering of the third cylinder is suppressed by the repulsive force due to the gas pressure, the screen is held in the stretched state.

  On the other hand, when storing, if the pedal is depressed with the hook member hooked on the hook portion, the first column locking mechanism is released and the second cylinder is lowered, but the first cylinder Since the body and the second cylinder constitute an air damper, the second cylinder descends slowly. Next, the hook member is removed from the hook portion, and the screen is accommodated in the casing by lowering the top bar as it is over the opening portion. Next, the third cylinder is pushed into the second cylinder, but the repulsive force due to the gas pressure in the cylinder acts as a braking force against the lowering of the third cylinder, and the third cylinder gradually descends. The third cylindrical body is fixed to the second cylindrical body by the lock member, and the shortening of the support is completed. Next, the top bar is fixed to the casing by the lock mechanism. The support column is stored so that the hook portion is turned parallel to the casing after being turned so that the hook portion does not protrude to the periphery.

  As described above, the portable screen device according to the present embodiment is provided with the lifting mechanism made up of the gas spring in the second cylindrical body. Since the cylinder can be automatically raised, even a large screen of 100 inches or the like can be easily expanded. On the other hand, since the third cylinder can be gently lowered and stored in the second cylinder during storage, smooth storage is possible. Further, since the handle is provided near the upper portion of the center of gravity of the screen device, the horizontal balance of the screen device is maintained, so that the screen device can be easily carried during storage. Since the column lock release mechanism is provided, the column can be shortened by a single operation of depressing the pedal, as in the first embodiment, and the storage operation of the screen device can be easily performed. Also have.

  In the present embodiment, an example in which one pulley is used on the cylinder side is shown, but two or more pulleys can also be used. That is, two or more pulleys supported by the same number of shafts are fixed to each end of the cylinder and piston rod of the gas spring, and one end is fixed to a sliding member disposed on the inner peripheral surface of the lower end of the upper cylinder. It is also possible to adopt a configuration in which the wire is alternately wound around two or more pulleys and the other end is fixed to the end of the piston rod. In this case, the lifting / lowering stroke of the third cylinder can be increased in proportion to the number of reciprocations of the wired wire. For example, in two reciprocations, a lifting / lowering stroke that is four times the expansion / contraction stroke of the gas spring is obtained. In four reciprocations, an up / down stroke of 8 times can be obtained. However, in order to reduce the size and weight of the column, it is preferable to use one pulley.

  In the present embodiment, the gas spring is arranged in the second cylinder so that the cylinder is positioned upward. However, the gas spring can be arranged so that the piston head is positioned upward. In this case, one pulley is pivotally supported at the lower end of the piston head, one end of the wire that runs over the pulley is fixed to the upper end of the cylinder, and the other end is arranged on the inner peripheral surface of the lower end of the upper cylinder. The wire is stretched by being fixed to the provided sliding member. Furthermore, the upper end of the cylinder is fixed to the upper part of the sliding member of the second cylinder, and the upper part of the piston rod is engaged with the sliding member attached to the inner peripheral surface of the lower end of the third cylinder.

  As described above, according to the present invention, the strut lock releasing mechanism that releases the engagement between the lowermost cylinder and the upper cylinder in conjunction with the depression of the pedal is provided. The strut can be shortened by a single operation of stepping on, and the storage operation of the screen device can be easily performed.

It is an example of the portable screen apparatus which concerns on Embodiment 1 of this invention, and is a model perspective view which shows the structure at the time of use. FIG. 2 is a schematic perspective view showing a structure in a state where the screen is rewound in the portable screen device of FIG. 1. It is a model perspective view which shows the structure at the time of accommodation of the portable screen apparatus of FIG. FIG. 4 is a schematic longitudinal sectional view taken along line IV-IV in FIG. 3. It is a model top view which shows an example of the pedal mechanism used for the portable screen apparatus of FIG. It is a schematic cross section which shows an example of operation | movement of the locking mechanism which fixes a top bar, (a) is a use condition, (b) shows a cancellation | release state. It is a model longitudinal cross-sectional view along the VI-VI line of FIG. It is a schematic cross section of the support | pillar of FIG. It is a model expanded sectional view of the piston part of FIG. It is a model exploded perspective view which shows the structure of the hook part used for the portable screen apparatus of FIG. It is a schematic cross section which shows the structure of the hook part used for the portable screen apparatus of FIG. 1, and a 2nd support | pillar lock mechanism. It is a schematic cross section which shows the structure of the hook part used for the portable screen apparatus of FIG. 1, and a 3rd support | pillar lock mechanism. It is the model top view (a) which shows an example of the structure of the arm for cancellation | release used for this invention, and a model side view (b). It is a schematic cross section which shows the structure of the modification 1 of a sliding member. It is a schematic cross section which shows the structure of the modification 2 of a sliding member. It is a model perspective view which shows the structure of the modification 1 of a locking mechanism. It is a model perspective view which shows the structure of the modification 2 of a locking mechanism. It is a model perspective view which shows the structure of the modification 3 of a locking mechanism. It is an example of the portable screen apparatus which concerns on Embodiment 2 of this invention, and is a model perspective view of the front side which shows the structure at the time of use. It is an example of the portable screen apparatus which concerns on Embodiment 2 of this invention, and is a model perspective view of the back side which shows the structure at the time of use. It is a model perspective view which shows the structure at the time of accommodation of the portable screen apparatus of FIG. It is a schematic longitudinal cross-sectional view along the XXII-XXII line | wire of FIG. It is a schematic plan view which shows an example of the pedal mechanism used for the portable screen apparatus of FIG. It is a schematic cross section which shows the structure of the hook part used for the portable screen apparatus of FIG. 19, and a raising / lowering mechanism. It is a model perspective view which shows the structure of the hook part used for the portable screen apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing, 1a 1st case member, 1b 2nd case member, 1c opening part, 1d cap, 2 spring roll, 3 leg part, 4 screen, 5 top bar, 5a support bar, 5b protective cover, 6 support | pillar, 6a first cylinder, 61a spacer, 62a through hole, 6b second cylinder, 62b through hole, 6c third cylinder, 61c, 61b spacer, 611b engagement hole, 62c first engagement hole, 63c 2nd engagement hole, 7 hook part, 71 hook member, 71a hook part, 71b guide groove, 71c ceiling part, 71d engagement hole, 72 support part, 72a sliding protrusion, 72b upper surface, 72c engagement protrusion , 8 First strut locking mechanism, 8a cylinder engaging portion, 81a engaging member, 82a spring body, 8b recess, 9 second strut locking mechanism, 9a cylinder engaging portion, 91a engaging member, 92a spring body, b recess, 10 lock mechanism, 10a lid, 10b floating shaft, 10c rotating shaft, 11 handle, 11a handle mounting member, 12 strut mounting member, 13 strut unlocking mechanism, 14, 15, 16 rivet, 17 pedal mechanism, 17a Pedal, 17b Shaft part, 17c Oscillating part, 17d Push-up part, 17e First spring locking part, 17f Return spring, 18 Support member, 18a Top part, 18b Base part, 18c Shaft part, 18d Recessed part, 19 Connecting part , 19a Support member, 19b Engagement end, 19c Release spring, 20 Release part, 20a Engagement part, 20b Upper end part, 21 Piston part, 21a Rod, 21b Piston packing, 21c Cushion ring, 21d Annular protrusion, 22 Slide member 22a Exhaust hole 22b Leak groove 22c Communication hole 22d Leak valve 27 Slide member 23 3 strut lock mechanism, 24 swing member, 24a release lever, 24b shaft, 24c claw, 24d release spring, 25 coupling cap, 26 release arm, 26a arm, 26b release part, 26c protrusion, 27 sliding Member, 28 first exhaust part, 29 second exhaust part, 30 sliding ring, 31, 32 braking mechanism, 31a screw member, 31b spring body, 31c swing piece, 31d flexible member, 32a cover member, 32b flexible member, 32c cap member, 32d screw member, 40, 41, 42 handle, 43 hook member, 44, 46, 47, 50, 51 belt member, 45, 48, 49, 52, 53 fixing member, 110 Hooking member, 110a Projection of hooking member, 111 Hooking member mounting member, 112 Strut mounting member, 113 Lock mechanism, 114 Handle, 115 Engagement part, 116 pedal mechanism, 116a pedal, 116b shaft part, 116c swing part, 116d push-up part, 116e first spring locking part, 117 swing member, 117a release lever, 117b contact protrusion, 117c Shaft portion, 117d urging spring, 117e engagement protrusion, 118 lock member, 118a first engagement protrusion, 118b second engagement protrusion, 118c urging spring, 120 gas spring, 120a cylinder, 120b piston rod, 121 pulley part, 121a pulley, 122 wire, 123, 124 sliding member, 125 piston part, 125a rod, 125b annular protrusion, 125c piston packing, 132 engagement hole, S1, S2 portable screen device.

Claims (26)

A casing having an opening extending in the longitudinal direction on the upper surface, a spring roll rotatably attached to the casing, a screen wound around the spring roll when stored, and unwound from the opening when used One end of the screen is fixed, and a top bar that also serves as a lid that closes the opening when stored, and one end that is pivotably supported at the center of the back surface of the casing, and the screen that is unwound when standing is in a stretched state. A portable screen device having telescopic struts to hold,
The support column is composed of a plurality of cylinders that are slidable and extendable by sliding to each other. The lowermost cylinder is engaged with the pulled-out next-stage cylinder to hold the support column at a predetermined height. A portable screen device provided with a strut lock releasing mechanism that releases the engagement between the lowermost cylinder and the next cylinder in conjunction with the depression of the pedal while providing one strut lock mechanism.   The first strut locking mechanism includes an engagement receiving portion including a through hole provided in an upper end portion of the lowermost first cylinder, and an inner peripheral surface of a lower end portion of the second cylinder in the next stage. An engagement protrusion that is disposed in a recess of the sliding member attached to the engagement member and engages with the engagement receiving portion, and the engagement portion engages with the through hole, and The portable screen device according to claim 1, further comprising a spring body that biases the engaging protrusion.   The strut lock release mechanism is disposed on the side surface of the pedal mechanism and the lowermost cylinder, and moves forward from the fixed position to the release position or moves backward from the release position to the fixed position along the longitudinal direction of the cylinder. 3. A release portion for releasing the next-stage engagement at a position, and a connecting portion for transmitting an operation force from the pedal mechanism and moving the release portion forward and backward along the longitudinal direction of the cylindrical body. The portable screen device as described.   4. The portable screen device according to claim 3, wherein the pedal mechanism has a pedal that is pivotally supported on the bottom surface of the casing so as to be swingable around the axis of the casing and protrudes to the front.   The connection portion includes a transmission member having a support portion supported by a base portion of the lowermost cylindrical body via a spring body, and a push-up portion that engages with one end of the release portion, and the spring The body urges the push-up part in a direction to return the release part to the fixed position, and pushes the release part in the direction of the fixed position by depressing the pedal against the urging force of the spring body. The portable screen device according to claim 4.   The release portion is a release bar disposed on the side surface of the lowermost cylinder so as to be movable in the longitudinal direction of the cylinder, and the tip thereof has a tapered cross section, and the release portion is advanced to the release position. The tip is brought into contact with the engaging protrusion, and the engaging protrusion is pushed into the concave portion of the sliding member to release the first support lock mechanism. The portable screen device according to any one of the above.   The column includes three cylinders, and has a second column lock mechanism that engages the uppermost third cylinder with the middle second cylinder, and the second column lock mechanism. Is disposed in the recess of the sliding member attached to the inner peripheral surface of the lower end portion of the upper third cylindrical body and the engagement receiving portion formed of a through hole provided in the upper end portion of the second cylindrical body. An engagement projection that engages with the engagement receiving portion, and the engagement portion engages with the through-hole, and a spring body that biases the engagement projection. When the first strut locking mechanism is released and the second cylinder is lowered by depressing the foot pedal, the engagement protrusion of the third cylinder comes into contact with the tip of the release part, and the engagement The portable screen device according to claim 6, wherein the protrusion is pushed into the concave portion of the sliding member to release the second support lock mechanism.   A piston portion slidable in the first cylindrical body is disposed at the bottom of the sliding member attached to the inner peripheral surface of the lower end portion of the second cylindrical body, while the first portion is provided at the base of the first cylindrical body. The portable screen device according to claim 1, wherein the first air damper is configured by the first cylindrical body and the second cylindrical body.   While the second exhaust part is provided on the upper part of the sliding member of the second cylindrical body, the first cylindrical body is placed at the bottom of the sliding member attached to the inner peripheral surface of the lower end part of the third cylindrical body. 9. The portable screen device according to claim 8, wherein a slidable piston portion is provided, and the second air damper is constituted by the second cylinder and the third cylinder.   The piston part includes a rod part attached to the bottom part of the sliding member, a piston packing attached to the tip of the rod part and slidably in contact with the inner peripheral surface of the first cylindrical body, and the rod part The portable screen device according to claim 8 or 9, comprising one or more cushion rings attached to an intermediate portion.   The portable screen device according to claim 10, wherein the rod portion has an inverted tapered shape in which the first cylindrical body has a small diameter.   The portable column according to any one of claims 1 to 6, wherein the support column has a lifting mechanism that is disposed in a lower cylinder and includes a gas spring that moves the upper cylinder of the lower cylinder up and down. Screen device.   13. The portable screen device according to claim 12, wherein the gas spring includes the upper cylinder, a cylinder that can move integrally in the vertical direction, and a piston rod that can slide in the cylinder in the axial direction.   The elevating mechanism further includes one pulley pivotally supported on the upper end portion of the cylinder and a wire hung on the pulley, and one end of the wire is fixed to the lower end portion of the piston rod. 14. The portable screen device according to claim 13, wherein the wire is stretched by fixing the other end to a sliding member disposed on the inner peripheral surface of the lower end portion of the upper cylindrical body.   The support column is composed of three cylinders, and fixes the lower end of the piston rod to the upper part of the sliding member of the middle second cylinder, while the inner periphery of the lower end of the uppermost third cylinder. The portable screen device according to claim 14, wherein a lower end portion of the cylinder is engaged with a sliding member attached to a surface, and the third cylindrical body is moved up and down as the cylinder moves up and down.   The hook member is fixed to the center portion of the top bar, and a hook portion is provided at an upper end portion of the support column, and the hook portion is hooked on the hook portion. The portable screen device described in 1.   The portable screen device according to claim 16, wherein a handle for carrying is provided on the top bar and spaced from the hooking member in the extending direction of the lying support post from the center.   The portable screen device according to claim 16, wherein the hooking member also serves as a carrying handle.   The hook part is attached to an upper end part of the support column so as to be horizontally rotatable, and the hook part is rotated to be in close contact with the casing when the support column falls down. Portable screen device.   The hook portion includes a hook member having a hook portion on a side portion for hooking the hook portion, a swing member disposed in the hook portion and engaged with an upper end portion of the second cylindrical body, a hook 20. The support according to any one of claims 16 to 19, further comprising a support portion that is concentrically inserted into the member and supports the hook member so as to be horizontally rotatable, and a connection cap that connects the support portion and the hook member. Portable screen device.   The rocking member has a claw portion at one end, and the claw portion is releasably engaged with the annular protrusion at the tip of the spacer member fitted to the second cylindrical body, 21. The portable screen device according to claim 20, wherein the third cylindrical body can be pulled out integrally from the first cylindrical body.   21. The portable screen device according to claim 20, wherein a lock member that engages the second cylinder and the third cylinder is provided inside the upper end portion of the third cylinder.   The swing member has a contact protrusion that can contact the lock member at one end and a release lever portion at the other end, and the contact protrusion is brought into contact with the lock member by pushing down the release lever portion. 23. The portable screen device according to claim 22, wherein the portable screen device is brought into contact with each other and the lock member is pushed inside the third cylinder to release the engagement between the second cylinder and the third cylinder.   The swing member has an engaging protrusion that engages with an engaging hole formed in a hooking portion of the hook member. When the screen is not used, the engaging hole and the engaging protrusion are The engaging lever accommodates the release lever portion in the hook member. On the other hand, when the screen is used, the engagement protrusion is pushed down by the hooking member to release the engagement with the engagement hole. 24. The portable screen device according to claim 23, wherein the portion protrudes below the hook member.   It has a slide-type lock mechanism that fixes the top bar to the casing during storage, and the lock mechanism has a claw portion at the front end and a rotary shaft via a floating shaft that performs a floating shaft movement at the rear end. 25. The lid according to any one of claims 1 to 24, comprising a connected lid and an engaging portion that engages with the claw portion, wherein the lid and the engaging portion are disposed with the opening of the casing interposed therebetween. The portable screen device described in 1. The lock mechanism includes a spring body that holds the lid in an open state, and the spring body is wound in an S shape around the floating shaft and the rotation shaft, one end abuts on the casing, and the other end 26. The portable screen device according to claim 25, which contacts the lid.

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