Height adjustment device for books and stools

摘要

The present invention relates to a height adjustment device of a book, a stool, in particular the height adjustment box 11 is formed integrally on one side of the upper end of the lower support pipe (1) is formed in the center of the rear; Built-in and fixed to the rear side of the height adjustment box 11, the adjustment hole (4-1) and the seating groove (4-2) is formed in succession to form the same axis as the hole (12), the front upper and lower parts A fixed block 4 having a slide surface 4-3 formed thereon; A seating plate 7-1 inserted into the seating groove 4-2 is fixed to the interruption side, and a key groove 7-2 is formed at a rear side of the seating hole 4-1. A ball screw 7 formed with a screw line 7-3 on the front side thereof; A nut block 5 having a nut hole 5-1 for screwing with a screw line 7-3 of the ball screw 7 is formed in the center thereof, and a slide surface 5-4 is formed on the upper and lower surfaces thereof, respectively. and; Its rear surface slides along the slide surfaces 4-3 and 5-4, respectively, and its front surface is fitted to the lower holding pipe 1 as the nut block 5 moves forward. Wedge block (6) in close contact with one side; Inserted into the adjustment hole (4-1) through the hole 12, the key (8-1) formed on the front inner peripheral surface is composed of an adjustment knob (8) fitted into the key groove (7-2) Characterized in the book, the height adjustment device of the stool.