Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Reexamination Certificate
1999-08-26
2001-04-24
Brown, Peter R. (Department: 3624)
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
C297S301300, C297S383000
Reexamination Certificate
active
06220664
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a base structure for a chair seat that allows rapid adjustment in the inclination angle of the backrest relative to the chair seat as well as rapid adjustment of distance between the backrest and the chair seat.
2. Description of the Related Art
A chair is often provided with an adjusting device for adjusting the inclination angle of the backrest relative to the seat, yet the adjustment is limited. Namely, the backrest can only be adjusted to two or three different inclined positions relative to the seat. In addition, the distance between the seat and the backrest is also not adjustable. The present invention is intended to provide an improved base structure for a chair seat that mitigates and/or obviates the above problems.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide an improved base structure for a chair seat that allows rapid adjustment in the inclination angle of the backrest relative to the chair seat as well as rapid adjustment of distance between the backrest and the chair seat.
In accordance with a first aspect of the invention, a base structure for a chair seat comprises:
a base adapted to be mounted to an underside of the chair seat, the base including two lateral walls, the lateral walls including aligned vertical slots, a first pin being slidably extended through the aligned vertical slots, one of the lateral walls including a vertical retaining means consisting of a plurality of vertical retaining positions, the other of the lateral walls including a guiding slot in alignment with the retaining means;
a swivel seat including a first end pivotally mounted between the lateral walls of the base by a second pin and a second end, the swivel seat being adapted to connect with an end of a backrest to pivot therewith;
an elastic member pivotally mounted to the swivel seat, the elastic member including a first end engaging the second pin and a second end engaging the first pin; and
an adjusting rod having a first operative end and a second end extended through the second end of the swivel seat and the lateral walls of the base, the second end of the adjusting rod being releasably engaged with one of the vertical retaining positions, thereby allowing adjustment of an inclination angle of the backrest relative to the seat.
The vertical retaining positions of the vertical retaining means are formed by a plurality of consecutively connected holes.
The swivel seat includes a horizontal retaining means consisting of a plurality of horizontal retaining positions, and the end of the backrest is connected to the swivel seat by a fastener, wherein the fastener is releasably engaged with one of the horizontal retaining positions, thereby allowing adjustment of horizontal position of the backrest relative to the seat. The horizontal retaining positions of the horizontal retaining means are formed by a plurality of consecutively connected holes. The fastener includes an enlarged head with a diameter greater than that of the holes of the horizontal retaining means, the fastener further including a shank extended from the enlarged head and having a diameter smaller than that of the holes of the horizontal retaining means. The fastener further includes a distal threaded end, and further includes a nut with a screw hole for engaging with the distal threaded end of the fastener, thereby preventing disengagement of the fastener.
In accordance with a second aspect of the invention, a base structure for a chair seat comprises:
a base adapted to be mounted to an underside of the chair seat, the base including two lateral walls, the lateral walls including aligned first vertical slots, a first pin being slidably extended through the aligned first vertical slots, one of the lateral walls including a vertical retaining means consisting of a plurality of vertical retaining positions, the other of the lateral walls including a guiding slot in alignment with the retaining means;
a swivel seat including a first end pivotally mounted between the lateral walls of the base by a second pin and a second end, the swivel seat further including a second vertical slot through which the first pin is slidably extended, the swivel seat being adapted to connect with an end of a backrest to pivot therewith, the swivel seat including a horizontal retaining means consisting of a plurality of horizontal retaining positions, the end of the backrest being connected to the swivel seat by a fastener, the fastener being releasably engaged with one of the horizontal retaining positions, thereby allowing adjustment of the horizontal position of the backrest relative to the seat;
an elastic member including a coil portion pivotally mounted in the swivel seat by a third pin, the elastic member including a first end engaging the second pin and a second engaging the first pin; and
an adjusting rod having a first operative end and a second end extended through the second end of the swivel seat and the lateral walls of the base, the second end of the adjusting rod being releasably engaged with one of the vertical retaining positions, thereby allowing adjustment of an inclination angle of the backrest relative to the seat.
In accordance with a third aspect of the invention, a base structure for a chair seat comprises:
a base adapted to be mounted to an underside of the chair seat; and
a swivel seat connected to the base, the swivel seat including a horizontal retaining means consisting of a plurality of horizontal retaining positions, an end of the backrest being connected to the swivel seat by a fastener, the fastener being releasably engaged with one of the horizontal retaining positions, thereby allowing adjustment of horizontal position of the backrest relative to the seat.
REFERENCES:
patent: 2329327 (1943-09-01), Boerner
patent: 3601444 (1971-08-01), Doerner
patent: 3709535 (1973-01-01), Rothermel
patent: 4221430 (1980-09-01), Frobose
patent: 5664834 (1997-09-01), Hsu
Brown Peter R.
Kamrath Alan
Rider Bennett Egan & Arundel, LLP.
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