Tension control mechanism for chair

Details Tension control mechanism for chair Tension control mechanism for chair

2007-10-16

2007-10-16

Cranmer, Laurie K. (Department: 3636)

Chairs and seats

Back movement resiliently opposed in operating position

Adjustable resistance

C297S303500, C297S300500, C297S300800

Reexamination Certificate

active

10749309

ABSTRACT:
The chair includes seat and back assemblies interconnected in a four-bar linkage. The chair further includes a tension mechanism comprising a coil spring projecting forwardly from a base and an adjustment linkage which is connected to said coil spring and to a front link of said four-bar linkage. A back linkage end of said adjustment linkage being axially movable along an axis of said coil spring and a front linkage end being vertically movable along said front link to adjust displacement of said adjustment linkage during rearward pivoting of said front link.

REFERENCES:
patent: 626521 (1899-06-01), Benjamin
patent: 2321385 (1943-06-01), Herold
patent: 2365200 (1944-12-01), Lorenz
patent: 2615496 (1952-10-01), Lorenz et al.
patent: 2784767 (1957-03-01), Soderberg
patent: 2859801 (1958-11-01), Moore
patent: 4009856 (1977-03-01), Wolters et al.
patent: 4270797 (1981-06-01), Brauning
patent: 4479679 (1984-10-01), Fries et al.
patent: 4502729 (1985-03-01), Locher
patent: 4537445 (1985-08-01), Neuhoff
patent: 4652050 (1987-03-01), Stevens
patent: 4653806 (1987-03-01), Willi
patent: 4682814 (1987-07-01), Hansen
patent: 4685730 (1987-08-01), Linguanotto
patent: 4695093 (1987-09-01), Suhr et al.
patent: 4709962 (1987-12-01), Steinmann
patent: 4758045 (1988-07-01), Edel et al.
patent: 4773706 (1988-09-01), Hinrichs
patent: 4979778 (1990-12-01), Shields
patent: 5026117 (1991-06-01), Faiks et al.
patent: 5042876 (1991-08-01), Faiks
patent: 5071189 (1991-12-01), Kratz
patent: 5160184 (1992-11-01), Faiks et al.
patent: 5195801 (1993-03-01), Franck et al.
patent: 5203853 (1993-04-01), Caruso
patent: 5207479 (1993-05-01), Wickman et al.
patent: 5209548 (1993-05-01), Locher
patent: 5308144 (1994-05-01), Korn
patent: 5328237 (1994-07-01), Yamaguchi et al.
patent: 5354120 (1994-10-01), Volkle
patent: 5375912 (1994-12-01), Stulik et al.
patent: 5772282 (1998-06-01), Stumpf et al.
patent: 5775774 (1998-07-01), Okano
patent: 5918935 (1999-07-01), Stulik et al.
patent: 5964503 (1999-10-01), Inoue
patent: 6000755 (1999-12-01), Uhlenbrock
patent: 3737491 (1989-05-01), None
patent: 3817761 (1989-11-01), None
patent: 3834614 (1990-04-01), None
patent: 0247312 (1987-12-01), None
patent: 0250207 (1987-12-01), None
patent: 0271600 (1988-06-01), None
patent: 0960586 (1999-12-01), None
patent: 2461472 (1981-02-01), None
patent: 1165135 (1969-09-01), None

Affiliated with

Also associated with

Rating

Tension control mechanism for chair does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tension control mechanism for chair, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tension control mechanism for chair will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3840002