Posture chair iron

Abstract

Abstract 536,763. Adjustable seats. BASSICK CO. Aug. 25, 1939, No. 24527. Convention date, Aug. 26, 1938. [Class 52 (ii)] Relates to means for adjusting the height of an office or other chair back and comprises two relatively-slidable U-shaped members provided with mutually engaging ribs and grooves, the outer member carrying the back and adapted to be clamped to the inner member by flexing the side walls towards one another and thus producing a frictional lock with the assistance of the ribs and grooves. As shown, the chair seat 18 is supported on a spider 17 secured to a swivelling socket 10 which supports an horizontal resilient joint of compressed tubular rubber carrying arms 32 upon the ends of which the back 83 of the chair is supported. The back is carried by a U-shaped member 76, 77 slidable vertically on a U-shaped member 50-51 which is pivoted upon a bolt 44 passing through the arms 32. After sliding the back vertically, the two U-shaped members are clamped together by the wedging action of cam surfaces arranged at the end of the bolt 44 and operated by a hand-lever 96 situated at the right-hand side of the chair. Grooves and ribs 79, 80 on the U-shaped members are thus pressed into tight locking engagement. By similar clamping arrangements provided at the end of a bolt 57 and operated by a hand-lever 74 at the left-hand side of the chair, the U-shaped member 50, 51 may be frictionally clamped to the arms 32 after adjusting the inclination of the back about the pivot 44. The necessary freedom of the bolt 57 during the tilting of the back about the pivot 44 is permitted by straight slots 53 in the U-shaped member 50, 51 and curved slots 56 in the arms 32.

Inventors

• 👤 Walter F Herold

Bibliographic Details