TODAY’S PATENT- CLAMPING DEVICE
The “Clamping Device” was invented by Tatusabu Tsukamoto. It was granted patent by USPTO (US4920614A) in 1st May 1990. Clamping devices are basically used to hold thick sheets of paper together.
Many such clips were brought into the market but they seemed to carry multiple defects – hold pages so tight that they would leave clamp marks, clips with the turned-up legs would obstruct the papers to be easily stacked in pile, the tips of the leg get in the way making it difficult to fully open the page. If the page is forced open, the clip may slip off.
Hence, this type of clamp is easily to use, fundamentally for clamping/clipping thick bundles of sheets.
This particular device has a pair of openable arms extending in a V-shape toward one side of a pivotal center and in a X-shape toward both sides of the same. It also contains a clamp means, holding the clamp arms together, which can be conveniently adjusted and positioned depending upon the thickness of the article to be clamped. The clamping force concentrates on the tips which are positioned inward from the edge of the article. Moreover, the edges are made symmetrical which helps retain the bulk from both surfaces firmly without causing damage.