DE20216041U1 - Extendable leg frame - Google Patents

Description

Dipl.-Chem. EL FRITZ GM 02/104

Dr. Dipl.-Phys. R. BASFELD October 16, 2002/DE/WO

Dipl.-Ing. J. GRAEFE Patent Attorneys M. HOFFMANN

B. HEIN Lawyers

Ostentor 9 59757 Arnsberg

KAO-SAN CHEN

No. 282, See. 2, Su Lin

Street

Tainan City

TAIWAN R.O.C.

Extendable leg frame"

-1- Background of the invention

The present invention relates to an extendable leg frame. In particular, the present invention relates to an extendable leg frame for a table or a folding chair.

Referring to Figures 1 and 2, a conventional extendible leg frame 1 has four leg rods 11, four

&iacgr;&ogr; swivel joints 12, four movable sleeves 13 and eight

connecting rods 14. Each pivot joint 12 is disposed at the upper end of the corresponding leg rod 11. Each movable sleeve 13 surrounds the corresponding leg rod 11. Each connecting rod 14 is connected to the corresponding pivot joint 12 and the corresponding movable sleeve 13. However, when the conventional extendable leg frame 1 is extended, the center of gravity of the conventional extendable leg frame 1 shifts upward. Therefore, the conventional extendable leg frame 1 is unstable. When the conventional extendable leg frame 1 is pushed by an operator, the conventional extendable leg frame 1 collapses.

Summary of the invention

An object of the present invention is to provide an extendable leg frame which stands stably while the extendable leg frame is extended. The center of gravity of the extendable leg frame is lowered. When the extendable leg frame is pushed by an operator, the extendable leg frame does not easily collapse.

-2-

Thus, an extendable leg frame comprises four support rods, four tubes, four hollow joints, four support shelves and eight connecting rods. Each hollow joint is located at the upper end of the corresponding support rod.

Each tube is located on the corresponding support base. Each support rod is received by the corresponding tube. Each connecting rod is connected to the corresponding hollow joint and the corresponding support base. Each support rod has a

round opening. Each hollow joint has a plurality of circular openings. A rivet fixes the corresponding hollow joint and the corresponding support rod together.

Short description of the drawings

Fig. 1 is a perspective view of a conventional

State-of-the-art extendible leg frame;

Fig. 2 is a schematic view showing the

Collapsibility of a conventional extendible leg frame according to the state of the art;

Fig. 3 is a perspective view of a

expandable leg frame of a first preferred embodiment in accordance with the present invention;

Fig. 4 is a partially exploded perspective view of

a collapsible leg frame according to Fig. 3;

Fig. 5 is a sectional schematic view showing the

Function of an extendable leg frame according to Fig. 3;

Fig. 6 is a perspective schematic view showing the

Function of an extendible leg frame according to Fig. 3;

 Fig. 7 is a schematic view showing the

Collapsibility of an extendible leg frame according to Fig. 3;

Fig. 8 is a partial sectional assembly view of a

extendable leg frame of a second

preferred embodiment in accordance with the present invention;

Fig. 9 is a partial sectional assembly view of a

extendable leg frame of a third preferred

Embodiment in accordance with the present invention and

Fig. 10 is a schematic view showing a support structure mounted on the extendible leg frame of Fig. 3

arranged seat cushion.

-A- Detailed description of the invention

Referring to Figs. 3 to 7, a first extendible leg frame 2 comprises four support rods 21, four tubes 230, four hollow joints 22, four support floors 23 and eight connecting rods 3.

Each hollow joint 22 is arranged at the upper end of the corresponding support rod 21.

Each tube 230 is arranged on the corresponding support base 23.

Each support rod 21 is received by the corresponding tube 230.

Each connecting rod 3 is connected to the corresponding hollow joint 22 and the corresponding support base 23.

Each support rod 21 has a circular opening 211. Each hollow joint 22 has a plurality of circular openings 221.

A rivet 24 fixes the corresponding hollow joint 22 and the corresponding support rod 21 together.

Each tube 230 has a through hole 231.

Referring to Fig. 8, a second extendible leg frame 2' comprises at least one support rod 21', at least one tube 230', at least one hollow joint 22' and at least one support base 23'.

The hollow joint 22' is arranged at the upper end of the support rod 21'. The tube 230' is arranged on the support base 23'. The tube 230' is inserted into the support rod 21'. A rivet 24' fixes the corresponding hollow joint 22' and the corresponding support rod 21' together.

Referring to Fig. 9, a third extendible leg frame 2" comprises at least one support rod 21", at least one tube 230", at least one hollow joint 22" and at least one support shelf 23".

The hollow joint 22" is located at the upper end of the support rod 21".

The tube 230" is arranged on the support base 23".

The support rod 21" is received by the tube 230".

A rivet 24" fixes the corresponding hollow joint 22" and the corresponding support rod 21" together.

Referring to Fig. 10, a collapsible chair support 4 arranged on the first extendable leg frame 2 is shown.

The invention is not limited to the present embodiments, and a variety of modifications and changes can be made. Furthermore, various changes in form and detail can be made without departing from the scope of the present invention.

·

·

Claims (3)

1. An extendible leg frame comprising: four support rods ( 21 ), four tubes ( 230 ), four hollow joints ( 22 ), four support floors ( 23 ) and eight connecting rods ( 3 ); - each hollow joint ( 22 ) is arranged at the upper end of the corresponding support rod ( 21 ); - each tube ( 230 ) is arranged on the corresponding support base ( 23 ); - each support rod ( 3 ) is received by the corresponding tube ( 230 ); - each connecting rod ( 3 ) is connected to the corresponding hollow joint ( 22 ) and the corresponding support base ( 23 ); - each support rod ( 21 ) has a round opening ( 211 ); - each hollow joint ( 22 ) has a plurality of circular openings ( 221 ), and - a rivet ( 24 ) fastens the corresponding hollow joint ( 22 ) and the corresponding support rod ( 21 ) together. 2. Extendable leg frame comprising: - at least one support rod ( 21 '), at least one tube ( 230 '), at least one hollow joint ( 22 ') and at least one support base ( 23 '), wherein - the hollow joint is arranged at the upper end of the support rod ( 21 '); - the tube ( 230 ') is arranged on the support base ( 23 '); - the tube ( 230 ') is received by the support rod ( 21 '); and - a rivet ( 24 ') fastens the hollow joint ( 22 ') and the support rod ( 21 ') together. 3. Extendable leg frame comprising: - at least one support rod ( 21 "), at least one tube ( 230 "), at least one hollow joint ( 22 ") and at least one support base ( 23 "), wherein - the hollow joint ( 22 ") is arranged at the upper end of the support rod ( 21 "); - the tube ( 230 ") is arranged on the support base ( 23 "); - the support rod ( 21 ") is received by the tube ( 230 "), and - a rivet ( 24 ") fastens the hollow joint ( 22 ") and the support rod ( 21 ") together.