JP4777156B2 - Sliding writing board with screen function - Google Patents

Description

  The present invention relates to a sliding-type writing board having a screen function, and more specifically, the writing board has a function as a projection screen for a projector or the like in addition to the original function of a blackboard or whiteboard, etc. It relates to the writing board of the ceremony.

  In lectures, classes, meetings, etc., a screen for projection by a projector or the like is often used together with a blackboard or whiteboard for writing. In general, a screen type that is suspended from the ceiling or a stand type screen is used as the screen.

  Thus, in addition to the blackboard and whiteboard, preparing a separate screen has problems in terms of cost, installation space, and troublesome setting. Therefore, recently, a combination of a writing board such as a blackboard or a whiteboard and a screen is on the market (Japanese Patent No. 2510809, Japanese Patent No. 3348696, etc.).

  In addition, a sliding blackboard is used to ensure a wide writing range and to ensure sufficient reference time and transcription time for written items.

  FIG. 4 shows the sliding mechanism. A wheel (sprocket) 53 is attached to the upper part of one or both side frames 52 of a wooden or aluminum frame 51, and a chain 54 is hung on the wheel 53. Then, each end of the chain 54 is fixed to a side portion of any one of the blackboards 55 and 56 arranged in the front and rear in the frame 51. Further, three guides 57 that support the vertical movement of the blackboards 55 and 56 are installed on the inner surface of the side frame 52.

  Thus, when the front blackboard 55 is pulled down, the rear blackboard 56 is supported and lifted between the guides 57 and 57, and when the front blackboard 55 is pushed up, the rear blackboard 56 is supported and lowered between the guides 57 and 57. To do. Do this and write on the blackboard located below.

  Since it may be necessary to write for explanation while watching the screen image, it is conceivable that the configuration of the above-mentioned screen blackboard is incorporated in the configuration of the vertical sliding blackboard. In that case, in order to make it easy to see from the back seat, it is common to place the screen blackboard at the top. However, as the position is higher, the projection angle from the projector or the like becomes smaller than the right angle with respect to the screen surface, and the screen image becomes blurred.

Japanese Patent No. 2510809 Japanese Patent No. 3348696

  The present invention was made in order to solve the above-described problems in a vertical sliding blackboard using a screen blackboard, and ensures a wide writing surface as a normal vertical sliding writing board. It can be used as a projector screen without preparing a separate screen, and even if the screen surface is positioned upward, the screen function can be clearly seen without blurring the screen image. It is an object to provide a slide-type writing board provided.

A sliding type writing board having a screen function according to the present invention for solving the above-mentioned problem is a chain in which two writing boards in the frame are hung around a wheel installed on the upper side frame of the frame. A sliding type writing board that can be moved up and down alternately via a connecting material such as at least a front writing board of the two writing boards that also serves as a screen, and the vertical movement of the writing board Of the guides installed to extend in the vertical direction on the inner surface of the side frame to support, the upper half of the frontmost guide is inclined to the front side, and the front writing board is moved by the action of the wheel. It is possible to ascend along the inclined portion of the frontmost guide. Preferably, two wheels are arranged side by side.

  The present invention is as described above, and the slide-type writing board having a screen function according to the present invention is a writing board having a screen function. Therefore, the writing board can be used as a screen. In addition, two writing boards are used, and the writing board arranged on the front side of the writing board tilts forward when it is slid upward, so that light from a projector or the like is applied at a right angle or an angle close thereto. Can do. Therefore, the screen image is not blurred and can be clearly seen. The lower writing board that is not used as a screen can be used as a normal writing board, and it can be used to project materials and at the same time explain related materials on the rear writing board. There is an effect that can be done.

  The best mode for carrying out the present invention will be described with reference to the accompanying drawings. 1 and 2 are side longitudinal sectional views of an embodiment of a sliding writing board 1 having a screen function according to the present invention, FIG. 3 is a partially enlarged view thereof, and the sliding writing board 1 is a conventional writing board 1. It is installed on a wall or the like using a mounting bracket in the same way as a thing.

  The writing boards 3 and 4 in the sliding writing board 1 include a blackboard, a white board, and the like, and a pair of them are arranged on the front and back in a square frame 2 made of wood or aluminum. At least the front writing board 3 of the front writing board 3 and the rear writing board 4 has a screen function.

  In order to give the writing boards 3 and 4 a screen function, for example, a known method such as applying a ceramic coating material disclosed in Japanese Patent No. 2510809 can be used.

  The construction for sliding the writing boards 3 and 4 up and down is basically the same as the conventional one. That is, a wheel 6 such as a sprocket or a pulley is installed on one or both side frames 5 of the frame 2, and a connecting material such as a chain 7 is hung around the wheel 6. Each end of the chain 7 is fixed to the side of one of the writing boards 3 and 4, and extends vertically on the inner surface of the side frame 5 to support the vertical movement of the writing boards 3 and 4. Three guides 8-10 are installed.

  In the present invention, among the three guides 8-10, the middle and rear guides 9, 10 are the same as the conventional ones, but the frontmost guide 8 is bent from the middle, and the upper half is It is inclined to the front side. Correspondingly, two wheels 6 are arranged side by side as shown in the figure, or a large diameter wheel having a diameter corresponding to the two wheels 6 arranged side by side.

  In the case of such a configuration, the front writing board 3 ascends vertically by pulling down the rear writing board 4 as in the prior art, while the upper part of the front writing board 3 is located at the position (or diameter) of the wheel 6. From the relationship, it tries to tilt under the action of being pulled toward the front side, but since it is sandwiched between the guides 9 and 10 and its movement is restricted, it rises vertically. Then, when the lower part reaches the vicinity of the intermediate bent portion of the guide 8, the guide 9 is released from the restriction and is tilted by the pulling action to be inclined along the upper half of the guide 8.

  Thus, the light projected from the projector or the like hits an angle close to a right angle, and a clear screen image can be obtained. Of course, even when the front writing board 3 is used as the original writing board and is positioned above, the written letters and the like are easy to see.

  In the figure, reference numeral 11 denotes a powder receiver attached to the lower part of the frame 1, and 12 denotes a buffer member attached to the upper surfaces of the writing boards 3 and 4.

  Although the present invention has been described in some detail with respect to its most preferred embodiments, it is clear that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention, so that the present invention is It is not limited to that particular embodiment except as limited in scope.

It is a side longitudinal cross-sectional view (when a front side writing board exists in the lower side) of one Embodiment of the sliding type writing board which has the screen function based on this invention. It is a side longitudinal cross-sectional view (when a front side writing board exists in an upper side) of one Embodiment of the sliding type writing board which has the screen function based on this invention. It is a principal part enlarged view of the slide-type writing board which has the screen function based on this invention. It is a side longitudinal cross-sectional view which shows the structural example of the conventional sliding type blackboard.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sliding writing board 2 Frame 3 Front writing board 4 Rear writing board 5 Side frame 6 Wheel 7 Chain 8 Guide 9 Guide 10 Guide 11 Powder receiver 12 Relieving member

Claims (2)

A slide-type writing board in which two writing boards in the front and back are alternately movable up and down through a connecting member such as a chain hung around a wheel installed on the upper side frame of the frame. Of the two writing boards, at least the front writing board is also used as a screen, and among the guides installed to extend vertically on the inner surface of the side frame to support the vertical movement of the writing board, The upper half of the frontmost guide is inclined forward, and the front writing board can be raised along the inclined portion of the frontmost guide by the action of the wheel. A sliding writing board with a screen function. The slide type writing board having the screen function according to claim 1, wherein two wheels are arranged side by side.

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