Office Chair with Strengthened Structure

Abstract

Office chair with improved structure includes: chair back, seat cushion, base frame, L-shaped connecting piece; among others, the vertical part and transversal part of the connecting piece are connected with the chair back and seat cushion respectively; there is an cylinder rod in the middle of the base frame, it coordinates with a handle to realize the lifting and dropping of the seat cushion, the vertical part and transversal part of the connecting piece are directly fixed at the back end of chair back and bottom side of chair seat respectively; in addition, there is a fixing hole coordinating with the top of cylinder rod at the corresponding position of the middle of the seat cushion on the transversal part of the connecting piece.

Description

CROSS REFERENCE TO RELATED PATENT APPLICATION

This application claims the priority of the Chinese patent application No. 200620062543.7, Which was filed on Aug. 4, 2006.

FIELD OF THE INVENTION

This invention deals with the technology field of office furniture, especially a type of office chair with the lift-and-drop seat cushion.

BACKGROUND OF THE INVENTION

Office chair, especially the office chair with the adjustable height, is one of the most widely used office equipment at present; due to its adjustable height, its position can be adjusted according to different requirements of people, which makes it quite popular with the public. Diagram 1 shows the structure of the office chair of this type at present, it includes: chair back 01, seat cushion 02, base frame 03 and L-shaped connecting piece 04; several support installed with rollers are molded on the outer fringe of the base frame 03 and the cylinder rod 05 is set in the middle of the base frame 03; a U-shaped chassis 06 is fixed at the bottom side of the chair seat 02; the vertical part 041 of the connecting piece 04 is fixed with the chair back 01 and a slender bar member 043 is projected on the front end of the transversal part 042; this slender bar member 043 is fixed on the chassis 06 by screws and there is a run-through hole coordinating with the top of cylinder rod 05 on the bottom of the chassis 06. The front end of the handle 07 goes through the side of the chassis 06 to coordinate the motion bar 08 of the cylinder rod 05, the motion bar 08 is connected with a piston bin (not shown in the drawing) in the cylinder rod 05, when push the handle 07 down, the motion bar 08 makes the piston bin action, thereby to adjust the height of the chair seat 02.

With this structure, the height of the seat cushion 02 of office chair can be adjusted; but it has the shortcomings of complex structure, high production costs and inconvenient installation for consumers. Furthermore, due to the fact that the transversal part 042 of connecting piece 042 are connected to the seat cushion 02 via the slender bar member 043 and chassis 06, the intensity is insufficient; when the consumer is leaning on the chair back 01 and rocking back and forth, the slender bar member 043 connecting the connecting piece 04 and chassis 06 is easy to be broken, resulting in unusable chair, and even injury of the user.

SUMMARY OF THE INVENTION

The objective of this invention is to provide a type of office chair with improved structure in view of the shortage of the present technology; it has the advantages of simple structure, low production costs, easy assembly and good safety, etc.

To achieve the aforesaid goal, the office chair with improved structure includes: chair back, seat cushion, base frame, L-shaped connecting piece; among others, the vertical part and transversal part of the connecting piece are connected with the chair back and seat cushion respectively; there is a cylinder with a cylinder rod in the middle of the base frame, a piston pin in the cylinder rod work together with a handle to realize the lifting and dropping of the seat cushion, the vertical part and transversal part of the connecting piece are directly fixed at the back end of chair back and bottom side of chair seat respectively; in addition, there is a fixing hole coordinating with the top of cylinder rod at the corresponding position of the middle of the seat cushion on the transversal part of the connecting piece.

This invention simplifies the structure by adopting the method of direct fixed connection between the transversal part of the connecting piece and the seat cushion, which is convenient to assemble and reduces production costs; in addition, it enhances the connecting intensity between the transversal part of the connecting piece and the seat cushion, which strengthened the stability of the chair.

BRIEF DESCRIPTION OF THE INVENTION

FIG. 1 is the structure scheme of the present office chair;

FIG. 2 is the structure scheme I of this invention;

FIG. 3 is the structure scheme II of this invention.

DETAIL DESCRIPTION OF THE INVENTION

The following is just one good example of the implementation of this invention; it is not used to limit the protection scope of this invention.

Please refer to the Attached Diagrams 2 and 3, this invention includes: chair back 10, seat cushion 20, base frame 30 and connecting piece 40; there is a cylinder with a cylinder rod 50 fixed in the middle of the base frame 30.

The Connecting piece 40 is L-shaped, there are several screw holes 401 on its vertical part 41 and transversal part 42 respectively, the vertical part 41 of the connecting piece 40 may be directly fixed at the back end of the chair back 10 via the screw hole 401, while the transversal part 42 is directly fixed at the bottom side of the seat cushion 20. To guarantee the intensity of the connecting piece 40, the width of the transversal part 42 of the connecting piece 40 is ⅓ to ¼ of that of the seat cushion 20 to enlarge the stressed area; and the length of the transversal part 40 of the connecting piece 40 is approximately ⅔ of that of the seat cushion 20.

Because the connecting piece 40 is molded in one piece, and its vertical part 41 and transversal part 42 are fixedly connected with chair back 10 and seat cushion 20 respectively, which makes the seat back 10 and seat cushion 20 become one piece so this fixed connection is very stable; when the consumer is leaning on the seat back 10 and rocking back and forth, the stable connection between the connecting piece 40 and seat cushion 20 can be guaranteed, and the safety of this invention is enhanced.

A fixing hole 421 is arranged on the corresponding position of the middle of the seat cushion 20 on the transversal part 42 of the connecting piece 40, and the fixing hole 421 coordinates with the top of the cylinder rod 50. The cylinder rod 50 supports the connecting piece 40 and seat cushion 20, the connecting piece 40 and seat cushion 20 may move up and down with the cylinder rod 50. The fixing hole 421 can be a run-through hole and the shape of it matches with that of the top of the cylinder rod 50 so as to fix the cylinder rod 50 firmly. The match between the fixing hole 421 and top of the cylinder rod 50 is tight fit. Metal or wood can be adopted as the materials for the connecting piece 40; if wood is adopted, a strengthening sleeve 43 can be nested in the fixing hole 421 on the transversal part 42 of the connecting piece 40, and the shape of the casing of strengthening sleeve 43 matches with that of the top of cylinder rod 50; during assembly, insert the top of cylinder rod 50 into the casing of strengthening sleeve 43 to increase the endurance of the fixing hole 421 against the top of cylinder rod 50.

In order to make the cylinder rod 50 coordinate better with the connecting piece 40 and seat cushion 20, this invention made the following improvements on the structure of cylinder rod 50: there is a connecting hole on the outer wall of cylinder rod (50) and the front end of handle 51 is inserted into the connecting hole to coordinate with a piston pin inside the cylinder rod (50). Pushing the handle 51 against the piston pin inside the cylinder rod 50 to control the upward and downward movements of the seat cushion 20.

Claims

1. An office chair with strengthened structure including:

a chair back, a seat cushion, a base frame, a L-shaped connecting piece;

a vertical part and a transversal part of the L-shaped connecting piece being connected with the chair back and the seat cushion respectively;

a cylinder with a cylinder rod in the middle of the base frame, a piston bin in the cylinder work together with a handle to realize the lifting and dropping of the seat cushion;

the vertical part and the transversal part of the L-shaped connecting piece being directly fixed at the back end of chair back and bottom side of chair seat respectively to avoid additional connection means, thereby to create a strong connection between the L-shaped connecting piece with the chair back and the chair seat;

the transversal part of the L-shaped connecting piece having a fixing hole located in the middle of the seat cushion, The fixing hole connecting the top of the cylinder rod firmly.

2. The office chair described in the claim 1, wherein the vertical part and transversal part of the L-shaped connecting piece are directly fixed with the chair back and seat cushion respectively by screws.

3. The office chair described in the claim 2, wherein the width of the transversal part of the L-shaped connecting piece is ⅓-¼ width of the seat cushion and the length is ⅔ length of the seat cushion.

4. The office chair described in the claim 3, wherein the material of the L-shaped connecting piece is metal; the top of the cylinder rod is directly inserted into the fixing hole in tight fit.

5. The office chair described in the claim 3, wherein the material of the L-shaped connecting piece is wood, the fixing hole is embedded a strengthening sleeve, the top of the cylinder rod is inserted into the strengthening sleeve.

6. The office chair described in the claim 1, wherein there is a connecting hole on the outer wall of the cylinder rod and a front end of the handle is inserted into the cylinder rod through the connecting hole to work together with a piston pin inside the cylinder rod for control hoist and recede of the seat cushion.

7. The office chair described in the claim 5, wherein there is a connecting hole on the outer wall of the cylinder rod and a front end of the handle is inserted into the cylinder rod through the connecting hole to work together with a piston pin inside the cylinder rod for control hoist and recede of the seat cushion.