JPH0442833Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a portable screen device that is installed in an auditorium, a meeting hall, etc. and projects slide images.

Conventional technology Conventionally, this type of screen device
It is described in Publication No. 51716. As an example, a rotation mechanism section having a worm foil and a worm is provided at the lower end of the upper column that supports the upper end of the screen at the tip, and the rotation mechanism section rotates the lower column through the support. The screen is configured to be attached to an upper end portion, and to change the inclination angle of the upper column by rotating the worm and rotating the worm to rotate the worm wheel, thereby setting the screen at a predetermined position. In addition, the lower column is equipped with a screen bottom supporter to support the screen bottom, and the tilt angle is adjusted so that the image is projected perpendicularly to the screen, so that a normal image without distortion is obtained. There is something that was made to be projected.

Problems to be Solved by the Invention In the above-mentioned conventional screen device, when the screen is small and lightweight, the upper column is tilted downward until it is horizontal, and the upper end of the screen is lifted up. By supporting the tip of the worm wheel and rotating the worm, the upper column can be easily raised upward while supporting the weight of the screen at the tip, and the screen can be placed in a predetermined position by adjusting its inclination angle. I was able to set it to .

However, if the screen is large and heavy, it is necessary to place the upper column horizontally, lift the top of the screen, support it at the tip of the upper column, and rotate the worm to raise the upper column. When rotating the worm, the large weight of the screen on the tip of the upper column applies a large moment load to the worm wheel, and the friction between the contact tooth surfaces of the worm wheel and worm is large, making it difficult to rotate the worm. Furthermore, there was a problem that the upper column could not be raised upwards due to damage to the rotating operation part.

The purpose of the present invention is to solve the above-mentioned problems, and to raise the upper column that supports a large and heavy screen at the tip upward by easy rotation of the worm, and to smoothly adjust the inclination of the column so that the screen can be moved to a specified position. The object of the present invention is to provide a screen device that can be set accurately in position.

Means for Solving the Problem The above object is to provide a rotating mechanism section having a worm foil and a worm at the lower end of the upper column supporting the upper end of the screen at its tip, and the rotating mechanism section is connected to its supporting body. In the screen device configured to be attached to the upper end of the lower pillar through a rotational operation of the worm, and to operate the worm foil and the upper pillar to set the screen, the rotation mechanism includes: A coil spring is provided, one end of which is supported by the worm foil, and the other end of which is supported by the support body of the rotation mechanism, and by installing the coil spring in a twisted state, the upper column body is directed upward. This is achieved by having a structure in which the rotational operation load of the worm is reduced when changing the inclination angle so as to stand up.

Function In the present invention, a coil spring used by twisting is attached to a rotating mechanism section having a worm wheel and a worm, and one end of the coil spring is supported by the worm foil and the other end is supported by the support body side of the rotating mechanism section. It is equipped as follows. In other words, one end of the coil spring can rotate together with the worm wheel.
The other end is in a fixed state, and by twisting this coil spring, its reversal force acts to raise the upper column upward. To give the coil spring a reversing force, first release the fixation between the upper column and the rotation mechanism, then rotate the worm and rotate the worm wheel to twist the coil spring and apply the reversing force. While holding it, re-fix the upper column and the rotation mechanism section.

Therefore, when the upper column is in a horizontal state and a large and heavy screen is supported at its tip, the reversing force of the coil spring acts on the worm foil to raise the upper column upward. Since the moment due to the large weight of the screen is maintained, the friction between the contact tooth surfaces of the worm wheel and the worm is reduced, and the worm can be easily rotated to raise the upper column upward and raise the screen. can be set precisely in the desired position.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 1 is a sectional view of a rotating mechanism in a screen device according to an embodiment of the present invention, and is a view taken in the direction of arrow A in FIG. 2, and FIG. 2 is also an overall view of the screen device.

In these figures, 1 is the screen, 2 is the upper column, 3 is the worm foil, 4 is the worm, and 5
6 is a rotation mechanism part, 6 is a lower column, 7 is a leg that supports the lower column 6, 8 is a lower support of the screen provided on the lower column, 9 is a support that supports the rotation mechanism 5 , 10 is a support shaft of the rotation mechanism section 5, 11 is a cylindrical body that supports the lower end of the upper column 2 and is a component of the rotation mechanism section 5, and 12 is for fixing the worm foil 3 to the cylindrical body 11. A set screw 13 rotatably supports the cylindrical body 11, and a set screw 1 is attached to the support body 9.
4 is an adjustment support pivotally supported on a support shaft 10 so as to stop rotation; 15 is a worm wheel 3 at one end;
a coil spring 16 whose other end is supported by the adjustment support 13 so as to stop rotating toward the support 9;
17 is a handle for rotating the worm 4. The worm wheel 3 is rotatably supported on the support shaft 10 and the support body 9 is provided with a spacing piece.

That is, in this embodiment, a rotating mechanism section 5 having a worm wheel 3 and a worm 4 is provided at the lower end of an upper column 2 that supports the upper end of the screen 1 at its tip. It is attached to the upper end of the column 6 via a support 9, and is operated so that the upper column 2 stands upward by rotating the worm 4 and rotating the worm wheel 3. For example, when a slide image is projected at an upward angle as shown by the broken arrow F on this screen 1, the lower end of the screen 1 is positioned so that the surface of the screen 1 is perpendicular to the projection direction F. , the screen 1 is supported by the lower rim support 8, and the upper rim of the screen 1 is supported by the upper pillar 2.
While supporting the screen at the tip of the screen, the screen is set at a predetermined position where the normal image is projected while changing the inclination angle θ to eliminate image distortion.

When performing such an operation, in this embodiment, a coil spring 15 is provided in the rotation mechanism 5 so that one end is supported by the worm foil 3 and the other end is supported by the support 9 side via the adjustment support 13. By rotating the handle 17, the coil spring 15 is twisted in a clockwise direction through the worm 4 and the worm foil 3, and in this state, the cylindrical body 11 and the worm foil 3 are fixed with the setscrew 12. The rotating mechanism unit 5 is mounted on the upper end of the lower column 6. Therefore, even when the upper column 2 is in a horizontal state and a large and heavy screen 1 is supported at its tip, the worm A coil spring 1 is attached to the foil 3 so as to raise the upper column 2 upward.
A reversing force in the counterclockwise return direction of the worm wheel 5 acts, which balances the moment due to the large weight of the screen 1 and reduces the friction between the contact tooth surfaces of the worm wheel 3 and the worm 4.

Therefore, the worm can be easily rotated to smoothly raise the upper column 2 upward, and adjust the inclination angle θ to accurately set the screen 1 at a predetermined position where a normal image is projected. can.

The reversing force can be adjusted by removing the set screw 14 while supporting the adjustment support 13 with a spanner, rotating the adjustment support 13 to make adjustments, and then attaching the set screw 14.

Further, this screen device can be used commonly as a viewing platform for suspending explanatory diagrams and the like.

Effects of the invention As explained above, according to the screen device of the invention, even if the screen is large and heavy,
The easy operation of the worm makes it possible to smoothly support the screen via the worm foil, and the worm foil and worm can be used for a long period of time, which is a practical effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a rotation mechanism in a screen device according to an embodiment of the present invention, a view taken in the direction of arrow A in FIG. 2, and FIG. 2 is an overall view of the screen device. DESCRIPTION OF SYMBOLS 1...Screen, 2...Upper column, 3...Worm foil, 4...Worm, 5...Rotation mechanism section, 6...Lower column, 9...Support, 10...Spindle, 11 ... Cylindrical body, 12 ... Set screw, 13 ...
... Adjustment support, 15 ... Coil spring, 17 ... Handle.

Claims (1)

[Scope of utility model registration request] The lower end of the upper column that supports the upper end of the screen at its tip is equipped with a rotation mechanism having a worm foil and a worm, and the rotation mechanism is attached to the upper end of the lower column via its support. In the screen device configured to change the inclination angle of the upper column by rotating the worm and rotating the worm wheel to set the screen at a predetermined position, the rotation mechanism section includes:
A coil spring is provided, one end of which is supported by the worm foil, and the other end of which is supported by the support body of the rotation mechanism, and by installing the coil spring in a twisted state, the upper column body is erected upward. A screen device characterized in that the screen device is configured such that a rotational operation load of the worm is reduced when changing the inclination angle so as to change the inclination angle.