Sheet holders

Abstract

A novel sheet holder either with or without a board. The sheet holder comprises a base angle plate and a holding angle plate, connected by extension springs for toggling said holding angle plate between a closed position for holding said sheet and an open position for removing said sheet. Two pegs and a rubber block with groove are installed for increasing the number of held sheets and more securely holding the mounted sheets. The present sheet holding board can be rotatably mounted to the back of a picture frame with locking feature. The sheet holder without board can be applied for holding advertisement sheet for indoor and outdoor display. Novel art hanging and control system will raise and lock the art for display, and lower it to a reachable level for display change. This art may include an art sheet, 3D art, or a computer monitor showing advertisement message. For outdoor display, a clear vinyl cover can be employed for holding an art sheet and protect it from UV radiation, rain and wind damage. A spring or weight load can be employed to maintain the art to be displayed in its uppermost position and leveled. Such spring and weight load can also be used in a flagpole for such benefit.

Description

[0001]This is a continuation-in-part of patent application Ser. No. 11 / 375,906, filed Mar. 15, 2006 and patent application Ser. No. 12 / 156,307, filed May 31, 2008CLAIM PRIORITY[0002]Provisional Patent Application No. 61008767, filed Dec. 24, 2007[0003]Provisional Patent Application No. 61070973, filed Mar. 26, 2008BACKGROUND OF THE INVENTION[0004]This invention relates in general to holding and displaying sheet arts, and more specifically, to sheet holders for holding and displaying the sheet arts. Here the sheet arts may include art sheets, printer outputs, advertisement sheets, and any sheet materials that are to be displayed.[0005]The most well-known type sheet holding board is a commonly termed clipboard. It is a thin board that is typically slightly larger than a pad of sheets of paper. Most pads used have a letter size of 8.5″×1″ (21.6 cm×27.9 cm) and A4 size of 21.0 cm×29.7 cm (8.27″×11.7″). Each clipboard has a large clip at the top for holding the sheet pad. In addition to ...

AI Technical Summary

Benefits of technology

[0012]In order to enhance the holding capacity of the sheet holder, a novel rubber block with a groove is installed beneath the holding plate. A stack of art sheets placed between the holding plate and the rubber block will be pressed under the spring force and be creased and seated deeply in the groove. The friction between the art sheets and the rubber surface may be greatly increased as a result, which would prevent the slippage of the vertically mounted art sheets.

[0019]A different kind of sheet holding board is also disclosed, in which the art sheet to be displayed is held between a rubber block with a groove and a round rod. Pressing force is applied to the rod by turning several screws, which causes some deformation of the rubber block. In the mean time, the friction created between the rubber block and the mounted art sheets is so high as to prevent any slippage of the mounted art sheet during its vertical display.

Problems solved by technology

Such clipboard works fine for holding a sheet pad, but is not ideally suitable for holding and changing the display of a stack of loose sheets.

It is not an easy job with just one hand, to remove the existing sheet stack, resort the new loose sheet stack, insert the new loose sheet stack, and reposition the sheet stack to make it neat in appearance.

Such display change is even harder to perform while the clipboard is hanging on a wall.

Partially due to the above-stated inconvenience, such clipboard is rarely used to display a stack of loose art sheets.

Such a large clipboard would be very cumbersome to operate.

Its clip also may not securely hold a stack of loose art sheets when the clipboard is hung on a wall.

It is more likely they don't like to pay a high price for a frame, which is difficult to use, and not easily reusable because of frequent change of poster sheets' sizes.

Due to lack of appropriate sheet holders for removably holding such advertisement, most advertisement art sheets must be custom glued to a thick rigid board for display.

As a result, the flag held in this flagpole will be shifted to a position below its normal uppermost position, an unsightly scene to the grace of the flag on display.

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