Seat tray

Abstract

The invention discloses a seat tray which comprises a cushion supporting plate, a backrest connecting plate and a base, wherein one end of the backrest connecting plate is rotatably connected with the base through a rotating shaft; the base is rotatably connected with the cushion supporting plate; the end of the backrest connecting plate is rotatably connected with a connector; an automatic rigid backrest adjusting device is arranged at the other end of the connector; a lifting adjustment lever is arranged on the base; a group of limiting teeth is arranged on the connector; a bevel angle telescopic head matched with the limiting teeth is arranged on the end face of the lifting adjustment lever; the limiting teeth take the telescopic direction of the bevel angle telescopic head as a baseline, the inclination of the left side face of the limiting teeth is 20-40 degrees, and the inclination of the right side face of the limiting teeth is 45-70 degrees. Both the left and right sides of the limiting teeth have a certain inclination, however, on one side with smaller inclination, the lifting adjustment lever cannot return by virtue of return force of a spring and can return by virtue of an external force. Therefore, a return device, such as a shifting fork, is avoided, and the operation is simple.

Description

technical field [0001] The invention belongs to the mechanical field of office chairs and swivel chairs, in particular to a seat tray. Background technique [0002] At present, most of the seats with backrests with tilting function are connected to the backrest through torsion springs or pressure springs, so that the backrest automatically resets after the external force is removed. For example, the Chinese patent with the publication number CN203106378 discloses a seat tray using a leaf spring, including a tray main body, a leaf spring and a back support plate. A longitudinal groove is formed on the bottom plate of the main body of the tray, and the depth gradually increases from the middle of the bottom plate to the edge. The width of the leaf spring is slightly smaller than the width of the groove. One end is installed on the bottom plate of the main body of the tray near the groove, and the other end is a free end, which can be bent downward in the groove and reset auto...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem in the prior art that the rigidity of the backrest of the seat cannot be automatically adjusted with the change of the user's weight, resulting in unsafe use, and the need to toggle the shift fork for the backrest to return to the initial position, which is troublesome to operate, and realizes a The device that can restore the backrest angle to the initial position has a simple structure, and can automatically adjust the rigidity of the backrest according to the force of the seat cushion, which is suitable for people of different weights, and the seat tray with high comfort

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