Chairs and seats – Back movement resiliently opposed in operating position – Constantly oriented during up-and-down movement
Patent
1989-07-18
1991-06-25
Brown, Peter R.
Chairs and seats
Back movement resiliently opposed in operating position
Constantly oriented during up-and-down movement
267131, 297301, A47C 300
Patent
active
050261177
ABSTRACT:
A controller is provided for seating, and the like, such as chairs of the type that have a stationary base or support, and a back which tilts about a generally horizontal axis with respect to the support. The controller includes an adjustable tension device, and a shared-load arrangement, which readily adapt the chair for different users and various applications. The adjustable tension device comprises a spring, having one end operably connected with a support, and the other end operably engaging the back at selected locations spaced apart from the tilt axis, such that rearward tilting of the chair back deflects the spring, and thereby generates a torque or back tension which resists further tilting. A shifter moves the other end of the spring between the selected back locations to vary the lever arm at which the spring acts, and thereby adjusts back tension. The shared-load arrangement comprises second and third springs, which are positioned on opposite sides of the first spring, and are operably connected between the support and the back. The second and third springs are pretensed to generate an initial torque which biases the back into a normally, fully upright position. The three controller springs combine to share the load applied to the back, with the second and third springs providing an initial, minimum back tension, and the first spring providing an additional, variable back tension.
REFERENCES:
patent: 217584 (1879-07-01), Chichester
patent: 240888 (1881-05-01), Chichester
patent: 244733 (1881-07-01), Bliss et al.
patent: 299846 (1884-06-01), Parry
patent: 316127 (1885-04-01), Demand
patent: 354183 (1886-12-01), Davis
patent: 555029 (1896-02-01), Watkins et al.
patent: 622073 (1899-03-01), Quinlan
patent: 928051 (1909-07-01), Higgins
patent: 981939 (1911-01-01), Persons
patent: 1178488 (1916-04-01), Bolens
patent: 1247625 (1917-11-01), Bolens
patent: 1299214 (1917-06-01), Bolens
patent: 1678668 (1928-07-01), Collier
patent: 1986105 (1932-04-01), Foote
patent: 2087253 (1937-07-01), Herold
patent: 2403425 (1946-07-01), Bolens
patent: 2619153 (1952-11-01), Van Osselen
patent: 2729273 (1956-01-01), Hamilton et al.
patent: 2760553 (1956-08-01), Lie
patent: 2778409 (1957-01-01), Soderberg
patent: 2784767 (1957-03-01), Soderberg
patent: 2818911 (1958-01-01), Syak
patent: 2845991 (1958-08-01), Soderberg
patent: 2877825 (1959-03-01), Olson
patent: 2971569 (1961-02-01), Parrott et al.
patent: 3031164 (1962-04-01), Schopf
patent: 3135549 (1964-06-01), Larsson
patent: 3203661 (1965-08-01), Brendel
patent: 3301520 (1967-01-01), Barth et al.
patent: 3339906 (1967-09-01), Persson
patent: 3437304 (1969-04-01), Decker
patent: 3594040 (1971-07-01), Monroe
patent: 3650498 (1972-03-01), Deak
patent: 3659819 (1972-05-01), Wolters
patent: 3669399 (1972-06-01), Wager
patent: 3685780 (1972-08-01), Stannebein
patent: 3693925 (1972-09-01), Weinstein
patent: 3756552 (1973-09-01), Wilhelms et al.
patent: 3806075 (1974-04-01), Sturhan
patent: 3897036 (1975-07-01), Nystrom
patent: 4013257 (1977-03-01), Paquette
patent: 4018415 (1977-04-01), Wolters
patent: 4019777 (1977-04-01), Hayashi
patent: 4077596 (1978-03-01), Pinaire et al.
patent: 4103858 (1978-08-01), Swenson
patent: 4575150 (1986-03-01), Smith
patent: 4595236 (1986-06-01), Rizzoli
patent: 4671569 (1987-06-01), Kazaoka et al.
Anderson Craig M.
Bischoff Daniel R.
Faiks Frederick S.
Brown Peter R.
Steelcase Inc.
LandOfFree
Controller for seating and the like does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controller for seating and the like, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controller for seating and the like will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1035471