Free height adjusting mechanism of student desk and chair

Abstract

The invention discloses a free height adjusting mechanism for a student desk and chair. The free height adjusting mechanism comprises an upper casing pipe and a lower casing pipe; the upper end of theupper casing pipe is connected to the desk or the chair; the lower end of the lower casing pipe is connected to a table bottom foot or a chair bottom foot; the upper casing pipe is inserted into thelower casing pipe; a fixing base is arranged in the lower end of the upper casing pipe; a through pore, front sliding sheet holes, rear sliding sheet holes, a left through hole and a right through hole are formed in the fixing base; an adjusting plate is arranged in the through pore; vertical adjusting holes are formed in the adjusting plate; an intermediate plate is formed between the vertical adjusting holes; clamping grooves are formed in the two sides of the intermediate plate; lifting sliding sheets are arranged in the front sliding sheet holes and the rear sliding sheet holes; the upperends of the lifting sliding sheets are connected to sliding sheet driving devices; the two sides of the lifting sliding sheets are provided with straight surfaces; inclined grooves are formed in the two sides of the lifting sliding sheets; clamping pins are arranged in the left through hole and the right through hole; a front tension spring and a rear tension spring are connected between the leftclamping pin and the right clamping pin; the lifting sliding sheets penetrate through the position between the left clamping pin and the right clamping pin; and the clamping pins are matched with thestraight surfaces or the inclined grooves of the two sides of the lifting sliding sheets.

Description

technical field [0001] The invention relates to desks and chairs for students, in particular to a mechanism for freely adjusting the desks and chairs for students up and down. Background technique [0002] The specifications of desks and chairs in primary and secondary schools are generally uniform, but the height of students varies greatly. In order to meet the needs of students of different heights, in recent years, tables and chair legs that can adjust the height of tables and chairs have been developed. Traditional The table and chair legs are adjusted by making connecting plates on both sides of the table and chairs. A plurality of adjustment holes of different heights are opened on the connecting plates, and fixing holes are opened on the legs of the table and chairs. Two studs pass through the adjustment hole and the fixing hole and are fixed by nuts, and the lifting of the table and chair legs can be adjusted by adjusting the fixing holes corresponding to the adjusti...

AI Technical Summary

Problems solved by technology

[0002] The specifications of desks and chairs in primary and secondary schools are generally uniform, but there is a large difference in the height of students. In order to meet the needs of students of different heights, in recent years, tables and chair legs that can adjust the height of tables and chairs have been developed. Traditional The table and chair legs are adjusted by making connecting plates on both sides of the table and chairs. A plurality of adjustment holes of different heights are opened on the connecting plates, and fixing holes are opened on the legs of the table and chairs. Two studs pass through the adjustment hole and the fixing hole and are fixed by nuts. The lifting of the table and chair feet is adjusted by adjusting the fixing hole corresponding to the adjusting hole of different heights to achieve the adjustment of the lifting. This structure must first be adjusted every time. Unscrew the studs and nuts, then align the fixing holes with the adjustment holes of the required height, and finally tighten the studs and nuts. The operation is very troublesome, laborious, and the adjustment speed is slow, and it is inconvenient for one person to operate

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