Head-lowering-prevention device

Abstract

A head-lowering-prevention device is used for preventing head lowering during learning or correcting the head lowering habit. The device is composed of a shell, a main telescopic rod 5, a jaw support7, a height control device of the main telescopic rod 5, and a clamping and fixing device, wherein the shell is formed by welding a shell front piece 1 and a shell rear piece 2, and a main guide groove 8 with an upward opening and a lower guide groove 9 with a lower opening and behind the main guide groove 8 are formed in the inner wall of the shell and used for containing the main telescopic rod5 and a lower telescopic rod 6 respectively; the main telescopic rod 5 and the lower telescopic rod 6 can slide up and down in the main guide groove 8 and in the lower guide groove 9, and a partitionplate is arranged or not arranged between the main telescopic rod 5 and the lower telescopic rod 6 which do not interfere with each other. The height control device is located on the upper portion ofthe shell, and by means of engaging and disengaging of a ratchet on a vertical face rack 15 of the main telescopic rod 5, the main telescopic rod 5 is allowed to freely slide up and down or slide in one direction. The clamping and fixing device is composed of the lower telescopic rod 6, a lower clamping plate 4 and an upper clamping plate 3 which is connected to the lower end of the shell, is opposite to the lower clamping plate 4 and faces the front; a structure which allows the lower telescopic rod 6 to slide up and down and is used for further lifting and pressing the lower telescopic rod 6is arranged on the lower portion of the shell rear piece 2 and on the rear side of the lower telescopic rod 6. Therefore, products save space, and the device is easy and quick to use.

Description

technical field [0001] The invention relates to a device fixed on the edge of a desk for preventing or correcting a student from bowing his head too much when studying. Background technique [0002] Most similar products in the prior art are fixed by horizontal U-shaped clamps, but the problem is that they are large in size and difficult to operate; the lifting of the main telescopic rod of some products is also particularly difficult for children, causing children to give up using them. Contents of the invention [0003] The object of the present invention is to provide an anti-bow device that occupies less space, is quick to use, and is easy to operate. [0004] In order to achieve the above object, the present invention is composed of a housing, a main telescopic rod connected with a chin rest, a height control device and a clamping device. [0005] The housing supports the entire product and combines all parts together, and is welded or screwed together by the front p...

AI Technical Summary

Problems solved by technology

[0002] Most of the similar products in the prior art are fixed by horizontal U-shaped clamps. The problem is that they are large in size and difficult to operate; the lifting and lowering of the main telescopic rod of some products is also particularly difficult for children, causing children to give up using them.

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