Semi-automatic height-adjustable and angle-adjustable desk

Abstract

A semi-automatic height-adjustable and angle-adjustable desk is characterized in that a desktop plate contacts with top ends of draw bars. Upper ends of the two front draw bars are respectively provided with a horizontal strip-shaped top, and the two tops run front and back and are parallel mutually. A front portion of the desktop plate is placed on the two front draw bars and is not connected with the front draw bars. Upper ends of the two rear draw bars are respectively fixed at two ends of a transverse bar, and the transverse bar is hinged with the desktop plate. An adjustment mode includes that the front draw bars and the rear draw bars are adjusted respectively, and if the adjusted directions and the adjusted distances of the front draw bars and the rear draw bars are identical, the height of the desk can be adjusted; and if the adjusted directions and the adjusted distances are not identical, the angle of the desk can be adjusted. Each draw bar is provided with a positioning device. A main body is a supporting plate. One end of the supporting plate is high while the other end of the supporting plate is low, and the high end of the supporting plate is supported on the draw bars while the low end of the supporting plate is supported on a desk frame. A pressure spring is disposed above the high end of the supporting plate and tightly presses the supporting plate. When the height of the desk needs to be increased, the desk can be directly adjusted to certain height in place, and then is positioned automatically; and when the height of the desk needs to be reduced, a user can jack up the supporting plate by fingers to lead the supporting plate to be separated from the draw bars at first, the draw bars and the desktop plate descend automatically by the aid of self gravity, after the draw bars and the desktop plate reach proper positions, the user can release the hands, and then the desk is positioned. Each draw bar is provided with a damper, and descending speed of each draw bar is controllable. The desk can be positioned firmly and can bear load of 150 kilograms maximally; adjustment is convenient and fast and only takes few seconds; and the distance between a desktop and the user is increased along increase of the angle, and the desk can be used for people to have art classes such as oil painting classes, gouache classes and the like in a common classroom.

Description

【Technical field】 [0001] The invention relates to an adjustable desk in the field of teaching equipment, and the adjustment of the height and angle of the desk is the key point involved. The angle mentioned here specifically refers to the size of the angle between the desktop and the horizontal plane, and the angle adjustment refers to the adjustment of the above angle. 【Background technique】 [0002] The desk that school uses at present, its desktop is mostly fixed. No matter how tall or short, no matter what class you take, the desk is the same. For students who are in the growth and development stage, long-term use of such desks can easily cause myopia and hunchback. In recent years, more and more primary and secondary schools have replaced fixed desks with liftable desks. The tabletop can be raised with the height of the students. But the problem is far from being solved. Different classes should have different table heights, and some classes also require the table t...

AI Technical Summary

Problems solved by technology

However, there are safety problems in this kind of fork structure: high resistance to lateral force difference, low resistance to vertical force difference; unilateral positioning, torque will be generated when pressed, and it is easy to damage the fragile central shaft and its adjacent components; Angle adjustment is positioned with concentric toothed discs, and

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