Chairs and seats – Movable back
Patent
1992-07-29
1995-01-17
Gall, Lloyd A.
Chairs and seats
Movable back
248412, 269231, 269236, 297375, 297410, B60N 202
Patent
active
053820770
ABSTRACT:
An improved height adjustment mechanism for a chair seat back is disclosed. The improved height adjustment mechanism includes a U-shaped mounting bracket having a back wall and two side walls. A longitudinal cam having a handle is rotatably mounted in the bracket between the side walls and spaced from the back wall. A seat back support arm is insertable through the bracket between the cam and the bracket back wall. The cam is provided with a plurality of planar faces extending in the longitudinal direction disposed around about a third of the circumference of the cam. The radial length of the line extending perpendicularly from each planar face to the longitudinal axis of the cam increases steadily from one planar face to the next in one direction around the circumference of the cam. This steady increase in distance of the planar faces from the axis of the cam provides a cam action on the seat back support arm when the cam is rotated in one direction with the support arm located between the cam and back wall. When the support arm has been sufficiently compressed between the cam and back wall, one of the planar faces will be bearing against the surface of the support arm thereby forming a positive lock between the cam and support arm which prevents loosening of the cam due to rotation of the latter to the unlocked position.
REFERENCES:
patent: 1102814 (1914-07-01), Streit
patent: 1198365 (1916-09-01), Manney
patent: 2095037 (1937-10-01), Reintjes
patent: 3155385 (1964-11-01), Lee
patent: 3166347 (1965-01-01), Andrews
patent: 3854772 (1974-12-01), Abrahamson et al.
patent: 3877751 (1975-04-01), Rasmussen
patent: 4192424 (1980-03-01), Allsop
patent: 4483565 (1984-11-01), Terui et al.
patent: 4536031 (1985-08-01), Latone
patent: 4805888 (1989-02-01), Bishop
patent: 4942712 (1990-07-01), Thompson
patent: 5023755 (1991-06-01), Rosenberg
patent: 5035466 (1991-07-01), Mathews et al.
patent: 5066069 (1991-11-01), DeGelder
Helmond Gerard G.
Patton Art A.
Stumpf William S.
Doerner Products Ltd.
Gall Lloyd A.
LandOfFree
Height adjustment mechanism for a chair seat back does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Height adjustment mechanism for a chair seat back, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Height adjustment mechanism for a chair seat back will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-743575