Supporting leg structure of chair, chair and clamp for machining supporting leg

Abstract

The utility model relates to a supporting leg structure of a chair, the chair and a clamp for processing the supporting leg, and the supporting leg structure of the chair comprises a first circular pipe for manufacturing a front supporting leg of the chair, a seat plate rotationally connected with the first circular pipe, and a rear chair leg connected with the first circular pipe through a connecting piece, the device is characterized in that a section with a pressure deflection section is arranged between the position, rotationally connected with the seat plate, of the first circular pipe and the lower end of the first circular pipe; and the length of the section of each section along the front-back direction of the chair is greater than that along the width direction. The supporting leg structure and the chair are reasonable in design, and the strength of the supporting leg of the chair can be improved under the condition that the material cost is not increased.

Description

TECHNICAL FIELD

[0001] The utility model discloses a supporting leg structure of a chair, the chair and the clamp of processing the supporting leg. BACKGROUND

[0002] A conventional folding chair is mainly composed of a front supporting leg in the shape of inverted U, a rear chair leg in the shape of H and a seat plate rotatably connected with the front supporting leg. Since the front supporting leg and the rear chair leg are both made of a round pipe, the front supporting leg is prone to bending deformation when subjected to a large impact force during use, thereby affecting the service life.

[0003] For example, Chinese patent "folding chair (plastic backrest fan-shaped steel 14-877)", announcement number CN3293683D.

[0004] In order to improve the strength of the front supporting leg, a section of inner pipe is inserted at a position close to the lower end (the end supported on the ground) of the front supporting leg to increase the strength. However, this structure not only increases the material cost, but also increases the manufacturing process. SUMMARY

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide a supporting leg structure of a chair, a chair and a clamp for processing the supporting leg. The supporting leg structure and the chair are designed reasonably, which is beneficial to improving the strength of the chair supporting leg without increasing the material cost.

[0006] The utility model discloses a supporting leg structure of a chair, which comprises a first circular pipe material for manufacturing a front supporting leg of a chair, a seat plate rotatably connected with the first circular pipe material and a rear chair leg connected with the first circular pipe material through a connecting piece. The utility model is characterized in that: a section with a pressure deviation is arranged between the position rotatably connected with the seat plate and the lower end of the first circular pipe material; the length of the section along the front-to-back direction of the chair is greater than the length of the section along the width direction.

[0007] Preferably, the section is in the shape of an ellipse, and the long axis direction of the elliptical section is along the front-to-back direction of the chair.

[0008] Preferably, the section is in the shape of "D", and the length direction of the "D"-shaped section is along the front-to-back direction of the chair, and the length direction of the "D"-shaped section is along the width direction of the chair.

[0009] A chair is characterized in that: the chair uses the above-mentioned supporting leg structure of a chair.

[0010] The utility model relates to a fixture of chair support leg structure, its characterized in being: including machine body, the fixture for clamping chair support leg set up on machine body and the drill bit for drilling set up on machine body and located at the side of fixture, the fixture includes fixed mould and movable mould for extruding and making first round tubular material partial segment produce pressure deviation deformation, the section of the cavity formed after fixed mould and movable mould close is same with the section of first round tubular material segment.

[0011] Preferably, the movable die is driven by a cylinder, a hydraulic cylinder or a screw nut mechanism to realize the extrusion action.

[0012] The utility model discloses a production method of chair support leg structure, first round tubular material is bent into inverted U shape in advance, and then it is installed in the fixture of the application, through the extrusion action of movable die, the segment with pressure deviation section is formed between the position of rotating connection with seat plate and the lower end of first round tubular material, because the section of the segment is greater than the length in width direction along the front and back direction of chair, thereby making the support leg of the chair have better bending strength in the corresponding position, which is beneficial to resist impact force, that is, beneficial to improve the strength of chair support leg without increasing material cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the three-dimensional structure schematic diagram of the utility model chair;

[0014] Figure 2 It is the A-A section structure schematic diagram of one embodiment of the utility model;

[0015] Figure 3 It is the A-A section structure schematic diagram of another embodiment of the utility model;

[0016] Figure 4 It is the structure schematic diagram of the fixture of the utility model;

[0017] Figure 5 It is Figure 4 the local structure schematic diagram. DETAILED DESCRIPTION

[0018] The method of the utility model will be further explained in detail in combination with the embodiments. It should be particularly pointed out that the protection scope of the utility model should include but not limited to the technical content disclosed in the embodiments.

[0019] The utility model discloses a chair support leg structure, including the first round tubular material 1 for making chair front support leg, the seat plate 2 of rotation connection with first round tubular material and the rear chair leg 4 of connecting with first round tubular material through connecting piece 3, and the structure is the existing chair structure.

[0020] The segment 5 has a pressure-biased cross section between the position of the rotating connection of the seat plate (the position of the rotating connection pin or rivet) and the lower end of the first circular tube (i.e. the position of the front support leg in contact with the ground), and the length of the cross section of the segment 5 along the front-to-back direction of the chair is greater than the length of the cross section along the width direction, so that the support leg of the chair has better bending strength at the corresponding position, which is beneficial to resist impact force, i.e. to improve the strength of the support leg of the chair without increasing the cost of materials.

[0021] In order to design reasonably, in one embodiment, the cross section of the segment 5 is in the shape of an ellipse, the long axis direction of the elliptical segment is along the front-to-back direction of the chair, as shown in the figure, the length of the long axis of the elliptical segment can be 23.5 mm, and the length of the short axis can be 20.5 mm, and the length of the segment 5 is 3-30 cm. Figure 2

[0022] In another embodiment, the cross section of the segment is in the shape of a "D" letter (or a mirror image of the "D" letter), the length direction of the "D" letter-shaped segment is along the front-to-back direction of the chair, and the length direction of the "D" letter-shaped segment is along the width direction of the chair, as shown in the figure, the length of the "D" letter-shaped segment can be 23.5 mm, and the width can be 20.5 mm, and the length of the segment 5 is 3-30 cm. Figure 3

[0023] When the chair uses the chair leg structure described above, the support leg of the chair has better bending strength at the corresponding position, which is beneficial to resist impact force.

[0024] In addition, during the production of the front support leg, drilling is required to install accessories in the drilled holes to enable connection with the seat plate 2 through pins, shafts, screws, rivets, etc. At present, drilling is processed on a drilling machine, and a clamp is required to hold the first circular tube during drilling. The clamp for processing the chair support leg structure of the present application specifically includes a machine body A1, a clamping tool A2 provided on the machine body for clamping the chair support leg, and a drill A3 provided on the machine body and located beside the clamping tool for drilling. The clamping tool includes a fixed mold A4 and a movable mold A5 for extruding to cause the local segment of the first circular tube to be pressure-biased, and the mold cavity formed after the fixed mold and the movable mold are combined has the same cross section as the segment of the first circular tube. Through the extrusion of the movable mold A5, the extruded position of the first circular tube has the same shape as the cross section of the mold cavity, i.e. the length of the cross section of the segment 5 along the front-to-back direction of the chair is greater than the length of the cross section along the width direction (such as an elliptical shape or a D shape, etc.).

[0025] ​​The utility model discloses a production method of the supporting leg structure of a chair, a first circular pipe material is bent into an inverted U shape in advance, and then the first circular pipe material is installed in the fixture of the utility model, the extrusion action of the movable die makes the first circular pipe material form a section with a pressure deviation between the position of rotationally connecting with the seat plate and the lower end of the first circular pipe material; since the length of the section along the front-back direction of the chair is greater than the length of the section along the width direction, the supporting leg of the chair has better bending strength at the corresponding position, which is beneficial to resisting impact force, that is, beneficial to improving the strength of the supporting leg of the chair without increasing the material cost.

[0026] Figure 4 、 5 The fixed die is located on the inner side of the two front supporting legs, and the movable die is located on the outer side of the two front supporting legs, of course, the fixed die can also be located on the outer side of the two front supporting legs, and the movable die can be located on the inner side of the two front supporting legs.

[0027] Specifically, the movable die can be driven by a cylinder, a hydraulic cylinder or a screw nut mechanism to realize the extrusion action.

[0028] Tests are conducted on the chair before improvement (the diameter of the first circular pipe material of the front supporting leg is 22 mm) and the improved chair of the utility model (the long axis of the pipe material of the front supporting leg is 23.5 mm, and the short axis is 20.5 mm), a 102 kg weight is used to freely fall from a position of 20 cm to impact the seat plate of the two kinds of chairs, the front supporting leg of the chair before improvement is deformed after 5 impacts, and the front supporting leg of the improved chair is not deformed after 10 impacts.

[0029] Through the above test, the supporting leg of the chair has better bending strength at the corresponding position, which is beneficial to resisting impact force, that is, beneficial to improving the strength of the supporting leg of the chair without increasing the material cost.

[0030] The above only describes the preferred embodiment of the utility model, and any change and modification made within the scope of the utility model patent application should be included in the scope of the utility model.

Claims

1. A support leg structure of a chair comprising a first round pipe material for making a front support leg of a chair, a seat plate rotatably connected with the first round pipe material, and a rear chair leg connected with the first round pipe material through a connecting piece, characterized in that: The segment has a press-biased cross section between the position of the rotational connection with the seat plate and the lower end of the first circular pipe; the length of the cross section of the segment in the front-rear direction of the chair is greater than the length in the width direction.

2. The support leg structure for a chair according to claim 1, characterized by: The cross section of the segment is elliptical, and the long axis direction of the elliptical segment is in the front-rear direction of the chair.

3. The support leg structure of a chair according to claim 1, characterized by: The cross section of the segment is "D" shaped, and the length direction of the "D" shaped segment is in the front-rear direction of the chair, and the length direction of the "D" shaped segment is in the width direction of the chair.

4. A chair, characterized by: The chair uses the support leg structure of the chair according to any one of claims 1-3.

5. A jig for processing the support leg structure of the chair according to any one of claims 1 to 3, characterized by: The machine body, a clamping tool for clamping the support leg of the chair arranged on the machine body, and a drill bit for drilling arranged on the machine body and beside the clamping tool, the clamping tool comprising a fixed die and a movable die for extruding the press-biased deformation of the local segment of the first circular pipe, and the cross section of the die cavity formed after the fixed die and the movable die are closed is the same as the cross section of the segment of the first circular pipe.

6. The clamp of claim 5, wherein: The movable die is driven by a pneumatic cylinder, a hydraulic cylinder or a screw nut mechanism to realize the extrusion action.

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