JPH05323454A - Ascending and descending screen - Google Patents

Abstract

PURPOSE:To obtain a safety ascending and descending screen whose ascending and descending action is smooth and in which stabilization at the time of using it is realized. CONSTITUTION:Arms linked in a state where they can bend are symmetrically arranged, and right and left linking parts are elongated and contracted by a wire 3, so that an ascending and descending mechanism 2 is actuated. The ends of upper arms 2a and 2c are bent, the load of rising from housing is decreased by turning a bent part, and the ascending and descending mechanism 2 is stabilized at the time of using a screen 1 by bringing the bent part of upper arms 2a and 2c into contact with lower arms 2b and 2d and contracting the wire 3. And a stopping device stopping the arms from turning when the wire 3 is cut so that the screen 1 does not fall is arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting screen for front projection type video equipment.

[0002]

2. Description of the Related Art FIG. 6 is an external view of a conventional lifting screen for controlling lifting by expanding and contracting a wire.
In the figure, 1 is a spring roller type screen having a structure of always winding, 2 is a lifting mechanism, 2a is an upper arm, 2b is a lower arm, 3 is a wire for controlling the lifting, 4 is a winding drum for the wire 3, 5a is A roller arranged on a shaft portion connecting the upper arm 2a and the lower arm 2b, 11 is a casing to which the lower arm 2b is attached, and 5b is a shaft portion that pivotally supports one lower arm 2b attached to the casing 11. Roller, 6 is a storage case, and 7 is a lifting design.

Next, the operation will be described. The end of the wire 3 is attached to the vicinity of a connecting portion between one upper arm 2a and one lower arm 2b of the elevating mechanism 2 which has arms that are bendably connected and is arranged symmetrically, and the other connecting portion. The roller 5a is guided downward and is wound around the wire winding drum 4 via the roller 5b attached to the lower arm support portion. The wire 3 is wound by rotating the winding drum 4 of the wire 3, and the connecting portion of the left and right upper and lower arms 2a and 2b in the mechanism in which the lower arm is closed by the housing 11 on which 2b is pivotally supported and the elevating mechanism 2. The upper arm 2 at the connecting part by tightening the
The angle formed by a and the lower arm 2b becomes an obtuse angle, and the screen 1
And the winding drum 4 of the wire 3 is reversely rotated to unwind the wire 3 and the tension of the screen 1 causes an acute angle between the upper arm 2a and the lower arm 2b at the connecting portion of the elevating mechanism to make the screen sharp. Is lowered and stored in the storage case 6.

[0004]

In the conventional lifting screen for controlling the lifting / lowering by winding and unwinding the wire, since the upper and lower arms are in contact with each other without any space in the housed state, an excessive driving force is applied at the time of start-up. It was needed and the tension on the wire was also great. In addition, the balance of the left and right depended on the tension of the screen, so it was unstable even when it was used. In addition, there was a risk that the lifting mechanism would fall because safety measures were not taken when the wire was broken.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a safe elevating screen for smoothly performing an elevating operation.

[0006]

A lifting screen according to the present invention has a structure in which a lower end is bent from a connection portion between the left and right upper arms of a lifting mechanism and a lower arm, and a wire is attached to a bent end of one upper arm. A wire guide mechanism that guides the wire is provided on the upper part of the lower arm that is attached to the end and is connected to the upper arm.Wire guide provided on the axis of the connecting part of the upper arm and the lower arm via the wire in the wire guide mechanism. A wire guide mechanism provided on the axis of the connecting portion of the other upper arm and the lower arm via the mechanism, a wire guide mechanism attached to the upper portion of the lower arm connected to the upper arm, and a bent portion of the upper arm. The wire is arranged so as to be wound up on the wire winding drum attached to the housing via the wire guide mechanism at the end of the.

Further, in the lifting screen according to the present invention, the bent portion of the upper arm is provided with an angle so that the bent portion of the upper arm and the lower arm come into contact with each other by tightening the wire in a standing state.

Further, in the lifting screen according to the present invention, a gear or the like is attached to the lower end of the lower arm of the lifting mechanism, the arm is attached to the housing, and a groove is provided vertically at the center of the housing, and along the groove. Attach the gear that meshes with the gear etc. so as to rise, arrange the spring so that the gear always lifts up, arrange the wire to push down the gear etc. with the tension of the wire, and the tension of the wire disappears And the gears at the lower end of the lower arm and the gears are arranged to engage with each other.

Further, in the lifting screen according to the present invention, a hard rubber pad is attached to the lower end of the lower arm of the lifting mechanism, the arm is attached to the housing, and a groove is provided at the center of the housing along the groove. Install a metal pin so that it rises, arrange the spring so that the metal pin always lifts, arrange the wire so that the metal pin is pushed down by the tension of the wire, and the tension of the wire It is arranged so as to engage with the rubber pad at the lower end of the lower arm when there is no longer.

[0010]

In the lifting screen according to the present invention, when the lifting screen is lifted from the storage, the wire is wound to rotate around the connecting portion between the upper arm and the lower arm to start the lifting mechanism. As an aid when starting up, by winding a wire, a couple of force is generated between the bent part of the upper arm and the lower arm, and it rotates around the axis of the connecting part, and the angle of the connecting part approaches an obtuse angle. .. Since it is increased by using this turning force, that is, couple force, the driving load can be reduced and the start-up is eliminated. Further, in the state of standing up, the bent portion of the upper arm and the lower arm are in contact with each other, so that the connecting portion between the upper arm and the lower arm cannot rotate and cannot swing to the left or right, which provides a sense of stability during use.

The lifting screen according to the present invention comprises:
Since the lower arm rotates to the left and right, the tension of the wire disappears when the wire is broken or stored, and the gear that has been pushed down by the tension of the wire always tries to move up to the center of the housing. By moving up and engaging with gears attached to the lower ends of the left and right lower arms, the rotation of the lower arm is stopped, and the wire can be stopped and placed until the tension of the wire is restored at that point.

Further, in the lifting screen according to the present invention, since the lower arm rotates to the left and right, the tension of the wire disappears when the wire is broken or stored, and the metal pin pushed down by the tension of the wire is removed. The spring that always tries to go up raises the center of the housing and engages the hard rubber pads attached to the lower ends of the left and right lower arms to stop the rotation of the lower arm and the wire tension at that point. It can be stopped and placed until it revives.

[0013]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a lifting screen according to an embodiment of the present invention when it is used, and FIG. 2 is an external view of a lifting screen according to an embodiment of the present invention when it is stored. 1 and 2
Is a screen with a built-in spring roller that is always wound up, 2 is a lifting mechanism, 2a and 2c are upper arms, 2
Reference numerals b and 2d denote lower arms, and reference numerals 2e and 2f denote bent portions of the upper arm, which are bent at the end side of the connecting portion. Reference numeral 3 is a wire for controlling the lifting and lowering, 4 is a wire winding drum for winding the wire, and 5a and 5c are rollers attached to shafts connecting the upper arms 2a, 2c and the lower arms 2b, 2d to change the pulling direction of the wire. The rollers 5e and 5d are attached to the lower arms 2b and 2d (the pulling direction of the wire stretched from the bent arm portion is changed to the connecting portion direction), and the roller 5f is attached to the bent arm portion (pulling direction). 5b is a roller attached to the arm attachment member to change the pulling direction in the direction of the wire winding rotary drum, 7 is a lifting design, 6 is a storage case, 11 is a housing attached to the arm. is there.

Next, the operation will be described. As shown in FIG. 1, the left-right symmetrical lifting mechanism 2 is attached to the housing 11, the bent portion 2f of the upper arm 2c on one side is used as the starting point of the wire 3, and the rollers 5d, 5c, 5a, 5e, 5f, 5b are arranged in this order. The wire 3 is hung on the lower arm support part by rotation of the wire winding drum 4 of the drive part attached to the housing 11, and the unwinding is performed to expand and contract between the left and right connecting parts to raise and lower the screen 1. In addition, the bent arm portions 2e, 2f further extending from the connecting portion of the upper arm and the lower arm are pulled by the wire being wound in the directions of arrows a and b in FIG. 2 and rotated about 5a, 5c. Perform initial startup. At the time of start-up, the fixed portion of the wire 3 and the roller 5c and between the roller 5f and the roller 5a are squeezed to each other and the upper arms 2c and 2a and the lower arm 2 are squeezed.
A force for rotating the upper arm with the connecting portion of d and 2b as a fulcrum acts to raise the screen 1. In the stored state as shown in FIG. 2, the wire 3 is wound between the ends of the bent upper arm portions 2e, 2f and the lower arms 2b, 2d to connect the upper arm portions 2a, 2c to the lower arm portions 2b, 2d. 5,
c as the center of rotation and lower arms 2b and 2d and bent portions 2e and 2
Since f is closed, it becomes a trigger for rising, and the required lifting force can be reduced as a lifting force for the lower arms 2b, 2d. Also, the bent portions 2e, 2f of the upper arm
By adjusting the bending angle of the upper arm 2a, 2c and the lower arm 2b, 2d in the raised state (when using a screen) to the opening angle of the joined portion, the bent arm portion of the lower arm 2b, 2d in the raised state 2e and 2f come into contact with each other to prevent the arm of the connecting portion from rotating and prevent it from swinging to the left or right.

Second Embodiment Another embodiment of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 is a detailed view of a stop device according to another embodiment of the present invention, and FIG. 4 is a detailed view of another embodiment of the present invention when the stop device is in operation. In the figure, 2b and 2d are lower arms,
Reference numeral 3 is a wire for controlling the lifting and lowering, 4 is a wire winding drum for winding the wire 3, 5b is a roller attached to the housing for changing the pulling direction of the wire, 8
a and 8b are gears attached to the lower end of the lower arm, 12
Is a groove vertically attached to the center of the arm mounting member, 9 is a gear that can move up and down along the groove, and 10 is a spring that constantly pushes up the liftable gear 9.

Next, the operation will be described. As shown in FIG. 3, the wire 3 is passed through the roller 5b and the other roller 5b.
Is stretched and wound around the winding drum 4. The gear 9 is pushed down by the tension of the wire 3. When the tension of the wire 3 disappears, the gear 9 that has been pushed down by the tension of the wire 3 always pushes up as shown in FIG. 4 by the spring 10 along the groove 12 formed in the center of the housing 11 in the direction of arrow c. And is engaged with the gears 8a and 8b attached to the end of the lower arm. Gears 8a, 8b attached to the ends of the lower arms 2b, 2d during operation
Rotate in directions symmetrical to each other, so that when the gears 9 are meshed with each other, the operation in which the gears 8a and 8b cannot rotate can be stopped.

Third Embodiment Still another embodiment of the present invention will be described below with reference to FIG. FIG. 5 is a detailed view of a stop device according to still another embodiment of the present invention. In the figure, 2b and 2d are lower arms,
Reference numeral 3 is a wire for controlling the lifting and lowering, 4 is a wire winding drum for winding the wire 3, 5b is a roller attached to the housing for changing the pulling direction of the wire, 13
Hard rubber pad attached to the lower end of the lower arm, 1
2 is a groove vertically attached to the center of the arm attachment member, 1
Reference numeral 4 is a metallic pin that can be moved up and down along the groove, and 15 is a spring that constantly pulls up the movable metallic pin 14.

Next, the operation will be described. As shown in FIG. 5, the wire 3 is stretched through the roller 5b and the other roller 5b and wound around the winding drum 4. The metallic pin 14 is pushed down by the tension of the wire 3. When the tension of wire 3 disappears, wire 3
The hard rubber pad 13 attached to the end of the lower arm is pulled up along the groove 12 formed in the center of the housing 11 by the spring 15 that always tries to pull up the gear 9 that has been pushed down by the tension of the lower arm. Engage. During operation, the hard rubber pads attached to the ends of the lower arms 2b and 2d rotate in directions symmetrical to each other. Therefore, when the metal pins 14 are engaged with each other, the lower arm 2b becomes a braked state and can rotate. The operation can be stopped because it disappears. Here, a metal pin is used for engagement, but a hard rubber pad can be used instead.

[0019]

As described above, according to the present invention, the end side of the connecting portion of the upper arm and the lower arm of the upper arm is bent, and the bent portion is provided with a wire attachment and a wire guide.
By stretching the wire so that it rotates around the connecting portion of the upper arm and the lower arm and winding the wire, the bending portion and the lower arm rotate in the closing direction to lift the upper arm and reduce the initial start-up force. Smooth startup from the stored state. Further, since the bent portion of the upper arm and the lower arm come into contact with each other at the time of start-up, rotation of the connecting portion is prevented, and the lifting mechanism can be stabilized.

Further, when the tension of the wire disappears due to cutting of the wire or the like, the lifting mechanism can be stopped by attaching the stop device of the present invention, so that the danger of dropping the screen or the like can be avoided. In addition, even when stored, the lifting mechanism itself can be fixed without depending on the tension of the screen itself.

[Brief description of drawings]

FIG. 1 is an external view of a lifting screen according to an embodiment of the present invention when in use.

FIG. 2 is an external view of a lifting screen according to an embodiment of the present invention when it is stored.

FIG. 3 is a detailed view of a stop device according to another embodiment of the present invention.

FIG. 4 is a detailed view of another embodiment of the present invention when the stop device is in operation.

FIG. 5 is a detailed view of a stop device according to still another embodiment of the present invention.

FIG. 6 is an external view of a conventional lifting screen when in use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 screen 2 lifting mechanism 2a, 2c upper arm 2b, 2d lower arm 2e, 2f bent arm portion 3 wire 4 winding drum 5a-5f rollers 8a, 8b gears 9 attached to the end of the lower arm 9 gears that can move up and down 10 , 15 Spring 11 Housing 13 Hard rubber pad 14 Metal pin

[Procedure amendment]

[Submission date] August 5, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a lifting screen according to an embodiment of the present invention when it is used, and FIG. 2 is an external view of a lifting screen according to an embodiment of the present invention when it is stored. 1 and 2
Is a screen with a built-in spring roller that is always wound up, 2 is a lifting mechanism, 2a and 2c are upper arms, 2
Reference numerals b and 2d denote lower arms, and reference numerals 2e and 2f denote bent portions of the upper arm, which are bent at the end side of the connecting portion. Reference numeral 3 is a wire for controlling the lifting and lowering, 4 is a wire winding drum for winding the wire, and 5a and 5c are rollers attached to shafts connecting the upper arms 2a, 2c and the lower arms 2b, 2d to change the pulling direction of the wire. The rollers 5e and 5d are attached to the lower arms 2b and 2d (the pulling direction of the wire stretched from the bent arm portion is changed to the connecting portion direction), and the roller 5f is attached to the bent arm portion (pulling direction). Roller 5b is attached to the arm attachment member and changes the pulling direction in the direction of the wire winding rotary drum, 7 is an elevating design, 6 is a storage case, 11 is a casing to which the elevating mechanism 2 is attached. It is the body.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction content]

Second Embodiment Another embodiment of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3 is a detailed view of a stop device according to another embodiment of the present invention, and FIG. 4 is a detailed view of another embodiment of the present invention when the stop device is in operation. In the figure, 2b and 2d are lower arms,
Reference numeral 3 is a wire for controlling the lifting and lowering, 4 is a wire winding drum for winding the wire 3, 5b is a roller attached to the housing for changing the pulling direction of the wire, 8
a and 8b are gears attached to the lower end of the lower arm, 12
Is a groove vertically attached to the center of the arm mounting member, 9 is a gear that can move up and down along the groove 12 , and 10 is a spring that constantly pushes up the liftable gear 9.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Next, the operation will be described. As shown in FIG. 3, the wire 3 is passed through the roller 5b and the other roller 5b.
Is stretched and wound around the winding drum 4. The gear 9 is pushed down by the tension of the wire 3. When the tension of the wire 3 disappears, the gear 9 that has been pushed down by the tension of the wire 3 always pushes up as shown in FIG. 4 by the spring 10 along the groove 12 formed in the center of the housing 11 in the direction of arrow c. Lower arm 2 pushed up by
It engages with gears 8a, 8b mounted at the ends of b, 2d . During operation, the gears 8a and 8b attached to the ends of the lower arms 2b and 2d rotate in directions symmetrical to each other, so that the gear 9
When the gears are meshed with each other, the operation in which the gears 8a and 8b cannot rotate can be stopped.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Next, the operation will be described. As shown in FIG. 5, the wire 3 is stretched through the roller 5b and the other roller 5b and wound around the winding drum 4. The metallic pin 14 is pushed down by the tension of the wire 3. When the tension of wire 3 disappears, wire 3
The hard rubber pad attached to the end of the lower arm by pulling up the metal pin 14 that has been pushed down by the tension of 1 along the groove 12 attached to the center of the housing 11 by the spring 15 that always tries to pull up. Engage with 13. During operation, the hard rubber pads attached to the ends of the lower arms 2b and 2d rotate in directions symmetrical to each other, so that the metal pin 1
When 4 is meshed, the lower arm 2b becomes in a braked state and cannot rotate, so that the operation can be stopped. Here, a metal pin is used for engagement, but a hard rubber pad can be used instead.

Claims (4)

[Claims] 1. A lift mechanism having left and right symmetrically arranged bendable upper and lower arms symmetrically arranged, and a lower end of the lower arm is provided on either the left or right side of the lift mechanism pivotally mounted on a housing. A fulcrum of the wire is provided near the connecting part of the arm, and the wire is tensioned via the shaft of the other connecting part via a wire guide mechanism attached on the lower end shaft of the lower arm, and the wire is wound up. In the lifting screen that controls the raising and lowering by winding and unwinding by, the bent part with the lower end bent from the connecting part with the lower arm of both upper arms is provided, and the end of the wire is bent in the bent part of one upper arm. Attach the wire guide mechanism to the upper part of the lower arm that is connected to the upper arm and attach the wire to the upper arm, and attach the wire to the wire guide mechanism that is provided on the connecting part axis. To the wire guide mechanism provided on the axis of the other arm connecting part via the wire guide mechanism attached to the upper part of the lower arm connected to the connecting part, and wire to the end of the bent part of the other upper arm. An elevating screen characterized in that a wire winding mechanism is attached to a wire guide mechanism attached to a housing, a wire winding mechanism is provided in a housing to which a lower end of a lower arm is attached, and the wire is arranged in the wire winding mechanism. 2. In the elevating screen, the bending angle of the upper arm bending part is set to be parallel to the lower arm when the elevating mechanism is in a raised state, and the bending part of the upper arm and the lower arm are further arranged in that state. The lifting screen according to claim 1, wherein the lifting screen has a structure so as to abut. 3. An elevating mechanism in which upper and lower arms connected so as to be bendable are symmetrically arranged, and a lower end of the lower arm is pivotally attached to a housing. A fulcrum of the wire is provided near the connecting part of the arm, and the wire is tensioned via the shaft of the other connecting part via a wire guide mechanism attached on the lower end shaft of the lower arm, and the wire is wound up. In the lifting screen that controls lifting by winding and unwinding, the gears are placed at the lower ends of the left and right lower arms, and when the wire tension drops, they rise above the center line of the left and right lower arms and are attached to the lower ends of the left and right lower arms. Lifting screen equipped with a gear so that the gear is attached so as to engage with the gear. 4. An elevating mechanism in which upper and lower arms connected so as to be bendable are symmetrically arranged, and a lower end of the lower arm is pivotally attached to a housing. A fulcrum of the wire is provided near the connecting part of the arm, and the wire is tensioned via the shaft of the other connecting part via a wire guide mechanism attached on the lower end shaft of the lower arm, and the wire is wound up. In the lifting screen that controls lifting by winding and unwinding, the rubber interlocking pads are placed at the lower ends of the left and right lower arms, and when the wire tension decreases, it rises on the center line of the left and right lower arms and the lower ends of the left and right lower arms. An elevating screen provided with a stop device having a metal pin attached so as to be engaged with a rubber pad attached to the.