Chair having seat elevating device

Chairs and seats – Movable bottom – Movable independently of back

Reexamination Certificate

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Details

C297S344170

Reexamination Certificate

active

06170914

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a chair, and more particularly to a chair having an elevating device for elevating the seat relative to a base.
2. Description of the Prior Art
Typical chairs, particularly sofas, comprise a seat or seat cushion solidly supported on a base. The seat may not be adjusted relative to the base such that the seat may not be adjusted according to the sizes of the users.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional chairs.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a chair including an elevating device for elevating a seat relative to a base according to the sizes of the users.
In accordance with one aspect of the invention, there is provided a chair comprising a base including two side portions and a front portion, the side portions of the base each including a track provided thereon, a seat provided above the base and including two side portions and a front portion, the side portions of the seat each including a track provided thereon, two follower devices each including a pair of bars pivotally secured together at a middle portion thereof and each having an upper end and a lower end, the upper ends of the bars being slidably coupled in the tracks of the seat, and the lower ends of the bars being slidably coupled in the tracks of the base, the bars being expanded and folded when the seat moves up and down relative to the base, and means for moving the seat up and down relative to the base.
The upper ends and the lower ends of the bars each includes a roller secured thereto, and the tracks each includes a groove formed therein for receiving the rollers respectively.
The moving means includes a tube provided in the base, a rod extended downward from the seat and slidably received in the tube and having an inner thread formed therein, a bolt rotatably received in the tube and threaded with the inner thread of the rod, and means for rotating the bolt to move the rod up and down relative to the tube. The base includes a gear rotatably supported therein, the bolt is secured to the gear and extended upward from the gear, the rotating means includes a motor having a pinion engaged with the gear for rotating the gear and the bolt.
A limiting device is further provided for limiting a relative movement between the rod and the tube. The tube includes a slot formed therein, the limiting means includes two microswitches secured to the tube, and an actuator secured to the rod and slidably received in the slot of the tube and engageable with the microswitches for limiting the relative movement between the rod and the tube.
The front portions of the base and of the seat each includes a front track provided thereon, the chair includes a pair of pivotal bars each having an upper end slidably coupled to the front track of the seat, and each having a lower end slidably coupled to the front track of the base.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.


REFERENCES:
patent: 3923280 (1975-12-01), Good
patent: 4700921 (1987-10-01), Holbrook
patent: 5708992 (1998-01-01), Gobbers et al.
patent: 1929413 (1970-12-01), None
patent: 4300738 (1992-10-01), None

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