Foldable chair frame

Details Foldable chair frame Foldable chair frame

2000-07-26

2001-12-25

Barfield, Anthony D. (Department: 3636)

Chairs and seats

Collapsible chair; i.e., relatively folding bottom, back,...

C297S019000, C297S046000, C297S056000

Reexamination Certificate

active

06332646

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a foldable chair frame, more particularly to a foldable chair frame with a relatively simple structure.
2. Description of the Related Art
Foldable chairs with backrests are known in the art. The conventional foldable chair of this type generally includes a backrest frame, a seat frame pivoted to the backrest frame, and front and rear legs pivoted to the seat frame and the backrest frame and further pivoted to each other. When the chair is folded, the seat frame is usually folded on the backrest frame, and the front and rear legs are folded on the seat frame. The conventional foldable chair as such occupies a relatively large amount of storage space after folding.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a foldable chair frame with a relatively simple structure and a reduced thickness after folding.
Accordingly, the foldable chair frame of the present invention includes a front leg, a rear leg, an adjustable extension rod, and a seat frame. The front leg has a lower end portion adapted to be supported on a ground surface, a tubular upper end portion which extends upwardly and rearwardly from the lower end portion and which confines an axial insert hole with a top opening, and an intermediate portion between the lower end portion and the tubular upper end portion. The upper end portion is formed with at least one radial positioning hole. The rear leg has a lower end portion adapted to be supported on the ground surface, an upper end portion which extends upwardly and forwardly from the lower end portion of the rear leg, and an intermediate portion connected pivotally to the intermediate portion of the front leg. The adjustable extension rod has a lower end portion extending into the axial insert hole in the upper end portion of the front leg via the top opening, and an upper end portion. The lower end portion of the extension rod is provided with a resilient positioning protrusion which projects radially into the positioning hole for engaging the positioning hole so as to position the lower end portion of the extension rod on the upper end portion of the front leg. The seat frame is disposed above the front and rear legs and the extension rod, and has a rear part connected pivotally to the upper end portion of the extension rod, and a front part connected pivotally to the upper end portion of the rear leg. The positioning protrusion is depressible for disengaging from the positioning hole to permit sliding movement of the extension rod relative to the front leg, thereby permitting the extension rod to retract into the upper end portion of the front leg, and thereby permitting folding of the front and rear legs toward the seat frame.


REFERENCES:
patent: 2902084 (1959-09-01), Stevens
patent: 3004793 (1961-10-01), Loomis
patent: 3123396 (1964-03-01), Searle
patent: 5893604 (1999-04-01), Yao

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