JPH063746A - Elevating/lowering screen device - Google Patents

Abstract

PURPOSE:To obtain an inexpensive elevating/lowering screen device whose elevating/lowering mechanism is housed in a thin state, and which is stable when it is operated and used. CONSTITUTION:The elevating/lowering mechanism in which upper and lower arms coupled to be bent are symmetrically arranged is pivotally supported in a housing 11, a wire 3 with a start point at the vicinity of either of right and left coupling parts is provided and wound to a wire take-up drum 4 attached to the housing 11 through the shaft of the other coupling part, so that two wires 3 are symmetrically arranged. The upper arms 2a and 2c are coupled through a spring 10. Then, a dog is provided in a wire for controlling elevate/ lower, an arm which is turned by causing the dog to abut on is provided, and a notched part meshing with a hook provided at the upper part of the elevating/ lowering mechanism is provided in the arm.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG. 10 is an external view showing a conventional lifting screen when it is raised. Further, FIG. 11 is an external view showing a conventional elevating screen stored. In the figure,
In 0 and 11, 1 is a screen with a built-in spring roller which has a structure of always winding, 2 is a lifting mechanism, 2a,
Reference numeral 2c is an upper arm, 2b and 2d are lower arms, 2e and 2f are bent portions of the upper arm, and end portions of the connecting portion are bent. Reference numeral 3 is a wire for controlling lifting and lowering, and 4 is a wire winding wire for winding the wire. The take-up drums 5a and 5c are attached to shafts connecting the upper arms 2a and 2c and the lower arms 2b and 2d, and rollers 5e and 5d for changing the pulling direction of the wire are attached to the lower arms 2b and 2d (bent) Roller 5f is attached to the bent arm portion (the pulling direction of the wire stretched from the arm portion is changed to the connecting portion direction). The roller 5b is attached to the arm attaching member. A roller for changing the pulling direction in the direction of the wire winding rotary drum, 7 is an elevating design, 6 is a storage case, and 11 is a case to which an arm is attached.

Next, the operation will be described. As shown in FIG. 10, the bilaterally 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 force for moving the wire 3 around the lower arm support part by rotating the wire take-up drum 4 of the drive part attached to the housing 11 and unwinding it to expand and contract between the left and right connecting parts and raise and lower the screen 1. In addition, the bent arm portions 2e, 2f extending further 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 housed state as shown in FIG. 11, the wire 5 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. ,
Lower arm 2b, 2d and bent portion 2e, with 5c as the center of rotation,
2f is closed to trigger a rise, and the lifting force required for lifting the lower arms 2b and 2d can be reduced. Also, the bent portions 2e, 2 of the upper arm
State where the bending angle of f is raised (when using a screen)
By adjusting to the opening angle of the connecting portion of the upper arms 2a, 2c and the lower arms 2b, 2d,
The bent arm portions 2e, 2f come into contact with the lower arms 2b, 2d to prevent the arm of the connecting portion from rotating and prevent the arm from swinging to the left or right.

[0004]

Since the conventional lifting screen device is constructed as described above, since it has a bent arm portion, a space is required to allow the bent arm to rotate during operation, and a storage case is required. I couldn't make it smaller.

Further, since the bent arm is used, the cost cannot be suppressed.

Further, unless the bent arm comes into contact with the lower arm, it is not stable and cannot be stopped midway.

Further, since the elevator screen device does not have a built-in speaker, another speaker device is required.

The present invention has been made to solve the above-mentioned problems, and the lifting mechanism can be housed thinly, and
An object of the present invention is to obtain a safe, inexpensive elevator screen device that is stable during operation and use.

[0009]

In the lifting screen device according to the present invention, two wires starting from the vicinity of a connecting portion of one of the upper and lower arms of the lifting mechanism, which are the starting points, are symmetrically stretched, and the other wire is the other. A wire winding drum is placed near the center of the mounting bracket that attaches the lifting mechanism to the housing via rollers provided near the connecting portion between the upper arm and the lower arm, and two wires are synchronously wound in equal amounts. It is to take and unwind. Further, a tension spring is used to connect between the connecting portion and the connecting portion of the upper arms which are symmetrically arranged. Further, the wire is provided with a dog, the lifting mechanism is provided with a hook, and the arm urged by the spring at all times is provided with a notch for engaging the hook.

Further, the lifting screen device according to the present invention is such that the speaker device is provided on the arm portion of the lifting mechanism.

Further, the lifting screen device according to the present invention is such that the speaker device is provided in the housing case for housing the lifting mechanism.

[0012]

In the lifting screen device according to the present invention, the two wires are symmetrically arranged so that the left and right lower arms are started from the vicinity of the connecting portion of one upper arm and the lower arm and the vicinity of the connecting portion of the other upper arm and the lower arm. A wire winding drum with an integrated structure of a motor and a speed reducer is placed near the center of the mounting bracket attached to the housing, and two wires are wound synchronously in the same amount to lower the left and right arms of the lifting mechanism. Stably raises the same amount, and pushes up the left and right upper arms connected to the lower arm, and pushes up and down the lifting design with the upper part of the screen attached.

By rotating the wire winding drum in the reverse direction to unwind the wire, the wire is loosened and the winding force of the spring roller built-in screen having a structure for always winding the wire lowers the elevating mechanism to house the screen. .

Further, since the left and right upper arms are connected by the tension springs, the angle between the upper arm and the upper arm of the elevating mechanism is widened at the time of lowering, and the time of storage is maximized.
The tension springs connected to the left and right upper arms are pulled to reduce the speed immediately before storage. Also, when stored, the tension spring always works to attract the upper arms,
The wire take-up drum assists the initial starting force when the wire is taken up and the lifting / lowering mechanism is lifted, so that the wire can be stably started.

When the wire is provided with a dog and the wire is unwound to lower the elevating mechanism,
Always abut the arm biased in a certain direction by the spring,
Rotate the arm. A key-shaped notch provided on the arm is provided on the lifting mechanism so that the hook can be bitten to fix the lifting mechanism.

Further, by raising the lifting mechanism, the speaker attached to the lifting mechanism is raised.

Further, by incorporating a speaker in the case accommodating the lifting mechanism, the voice can be heard from the same direction as the screen.

[0018]

【Example】

Example 1. Hereinafter, the present invention will be described with reference to the drawings. Figure 1
FIG. 3 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 perspective view showing details of a housing of a lifting screen according to an exemplary embodiment of the present invention. FIG. 4 is a perspective view showing details of a connecting portion between an upper arm and a lower arm of a lifting screen according to an exemplary embodiment of the present invention.
In the figure, 1 is a screen with a built-in spring roller having a structure that is always rolled up, and 2 is the entire lifting mechanism.
a and 2c are upper arms, 2b and 2d are lower arms, and 3 is a wire for controlling the lifting mechanism, which is symmetrical with one of the upper arm and the lower arm, and the other is the upper arm and the lower arm. The lifting mechanism 2 through the housing 11
Two coils are attached to the wire winding drum 4 in which the motor and the speed reducer are integrally formed, and the motor and the speed reducer are integrally formed. 5
Reference numerals a and 5c are rollers provided on the connecting shaft of the upper arm and the lower arm for changing the pulling direction of the wire 3, 7 is an elevating design, and 6 is a storage case. Reference numeral 10 is a tension spring attached between the left and right upper arms.

Next, the operation will be described. As shown in FIG. 1, the bilaterally symmetrical lifting mechanism 2 is attached to the housing 11, and the vicinity of the connecting portion between one upper arm 2c and the lower arm 2d is used as the starting point of the first wire 3 and the other upper arm 2a and the lower arm 2a. Via the roller 5a provided on the connecting shaft of the arm 2b,
A motor and a speed reducer provided near the center of a housing 11 to which the lifting mechanism 2 is attached are stretched on a wire winding drum 4 having an integrated structure. The second wire starts from the vicinity of the connecting portion between the upper arm 2a and the lower arm 2b, and the lifting mechanism 2 is moved symmetrically via a roller 5c provided on the connecting shaft of the upper arm 2c and the lower arm 2d. A motor and a speed reducer provided near the center of the attached housing 11 are wound around a winding drum 4 having an integrated structure. As shown in FIG. 3, two winding drums 4 are synchronously wound up and unwound as shown in FIG. . When the winding drum is rotated to wind the wire, the upper arm 2a and the lower arm 2b as shown in FIG.
Since the pulling direction is changed by the roller 5a provided on the connecting shaft of the wire 3 and the vicinity of the connecting portion of the upper arm 2c and the lower arm 2d is used as the starting point of the wire 3, the connecting portion of the wire 3, the upper arm 2a and the lower arm 2b is provided. By winding the two wires 3 wound around the wire winding drum 4 in the same manner as the wire 3 through the roller 5c provided on the connecting shaft of the upper arm 2c and the lower arm 2d starting from By tightening the connection between the upper arm and the lower arm of the elevating mechanism 2 and the other connecting part, the elevating mechanism 2 rises and the screen 1 attached to the elevating mechanism 2 rises. Further, as the wires are unwound, the two wires 3 are synchronously and evenly unwound, and the lifting mechanism 2 is lifted by the self-weight of the lifting mechanism 2 and the winding force of the spring roller built-in screen 1 having a structure of always pulling. Are lowered and stored in the storage case 6.

Further, FIG. 5 shows the details of the upper part of the lifting mechanism when rotating the wire winding drum 4 to unwind the wire 3 and lower the lifting mechanism 2, and FIG. 6 shows the details of the upper part of the lifting mechanism immediately before storage. Shown in. In FIG. 5, the elevating mechanism 2 is not lowered, the angles of the upper arms 2a and 2c are narrow, and the tension spring 10 is not extended. When the elevating mechanism 2 is lowered and immediately before storage, the tension spring 10 extends and the storage speed immediately before storage can be reduced. Further, the retracting spring 10 exerts a force to attract the left and right upper arms 2a and 2c during storage, and assists the initial starting force for raising the screen 1 by winding the wire 3 by rotating the wire winding drum 4. .

Example 2. FIG. 7 is a perspective view showing the details of the casing relating to the lifting screen in the second embodiment of the present invention. In FIG. 7, 2b is a lower arm of the lifting mechanism, and 3 is a wire for controlling the lifting, to which the dog 15 is attached. Reference numeral 4 is a wire winding drum in which a motor attached to the housing 11 and a speed reducer are integrally structured. Reference numeral 16 is a hook provided on the upper part of the elevating mechanism, 17 is an arm which is constantly urged toward the wire winding drum 4 by a spring 18, and a notch portion 17 into which the hook 16 is engaged.
a is provided. A limit switch 19 is turned on by the rotation of the arm 17.

Next, the operation will be described. By rotating the wire winding drum 4 to unwind the wire 3, the elevating mechanism 2 is lowered, and the screen 1 attached to the elevating mechanism 2 is stored. Then wire 3
By providing the dog 15 with the dog 15, the dog 15 comes into contact with the arm 17 and always rotates the arm 17 biased by the spring 18. Further, the notch 17a provided on the arm 17 bites and fixes the hook 16 provided on the lifting mechanism. When the arm 17 further rotates, the limit switch 19 is pushed to stop the rotation of the wire winding drum having the motor and the speed reducer integrated with each other. Next, by rotating the wire winding drum in the reverse direction to wind the wire, the dog 15 is separated from the arm 17, and the cutout portion 17a that has caught the hook 16 is removed.
It is possible to ascend, and by further winding the wire 3, the elevating mechanism 2 ascends.

Example 3. FIG. 8 is a front view showing the whole of the lifting screen in the third embodiment of the present invention when in use, and FIG. 9 is a front view showing the whole of the lifting screen in the third embodiment of the present invention when stored. 8 and 9,
1 is a screen with a built-in spring roller, 2 is a lifting mechanism, 6 is a storage case that houses the lifting mechanism, 7 is a lifting design,
Reference numeral 20 is a speaker device attached to the lifting mechanism, and 21 is a speaker provided in the storage case.

Next, the operation will be described. As shown in FIG. 8, the wire 3 attached to the elevating mechanism 2 is rotated by a wire winding drum 4 in which a motor and a speed reducer are integrated, and the wire 3 is wound up to elevate the elevating mechanism 2. The speaker 20 attached to the lifting mechanism 2 is lifted. In addition, a storage case 6 that stores the lifting mechanism 2
By incorporating the speaker 21 in, the sound is emitted from the storage case 6 and the upper part of the elevating mechanism 2.

[0025]

As described above, according to the present invention, the wires for controlling the raising and lowering of the lifting mechanism are symmetrically arranged, and the equal amount of wires are synchronously wound to unwind and unwind the lifting mechanism. It is possible to obtain a stable lifting operation. Further, during use, the two right and left wires are tightened with an equivalent force to raise the lifting mechanism, so that the force applied to the left and right arms of the lifting mechanism is constant and stability can be obtained.

Further, a dog is provided in the wire for controlling the lifting and lowering, and the arm provided with the notch for engaging with the hook provided in the lifting and lowering mechanism is provided in the lifting and lowering mechanism by contacting the dog. By engaging with the hook, there is an effect that a safety device can be obtained at low cost, which can be locked so that the lifting mechanism does not rise carelessly during storage.

Further, a speaker can be attached to the elevating mechanism, the speaker can be lifted as the screen rises, and a speaker can be attached to the storage case to form four speakers, so that sound image localization on a large screen can be obtained.

[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 perspective view showing details of a housing of a lifting screen according to an exemplary embodiment of the present invention.

FIG. 4 is a perspective view showing details of a connecting portion between an upper arm and a lower arm of a lifting screen according to an exemplary embodiment of the present invention.

FIG. 5 is a detailed view of a lifting screen of a lifting screen according to an exemplary embodiment of the present invention when the lifting mechanism is lifted.

FIG. 6 is a detailed view of the lifting screen of the lifting screen according to the exemplary embodiment of the present invention when the lifting mechanism is lowered.

FIG. 7 is a perspective view showing details of a casing related to a lifting screen according to a second embodiment of the present invention.

FIG. 8 is a front view showing the whole of the lifting screen in use according to the third embodiment of the present invention.

FIG. 9 is a front view showing the entire lifting screen according to the third embodiment of the present invention when it is stored.

FIG. 10 is a front view showing the whole of a conventional lifting screen when in use.

FIG. 11 is a front view showing the entire conventional lifting screen when it is stored.

[Explanation of symbols]

 1 Screen 2 Lifting Mechanism 3 Wire 4 Winding Drum 5a, 5C Roller 6 Storage Case 7 Lifting Design 10, 18 Extension Spring 11 Housing 15 Dog 16 Hook 17 Arm 17a Notch 20 Speaker 21 Mounted to Lifting Mechanism Storage Case Attached to the speaker

Claims (3)

[Claims] 1. A lift mechanism having left and right symmetrically arranged upper and lower arms connected in a bendable manner, the lower end of the lower arm being pivotally mounted on the housing. The starting point of the wire is provided near the connecting part of the arm, and the wire is wound up and down by the winding mechanism via the shaft of the other connecting part, unwinding, and the wire is symmetrically set on the lifting screen that controls the lifting. 1 each
An elevating screen device in which two wires are arranged one by one and the two wires are synchronously wound by the same amount. 2. An elevating mechanism in which upper and lower arms flexibly connected are symmetrically arranged, and a lower end of the lower arm is pivotally attached to a housing. A lifting screen device in which the speaker is raised in synchronization with the lifting of the lifting mechanism. 3. A lifting screen device, wherein a speaker is attached to the lifting mechanism storage case.