CN211666494U

CN211666494U - Integrated damping optimizing structure of furniture hinge

Info

Publication number: CN211666494U
Application number: CN202020014687.5U
Authority: CN
Inventors: 伍志勇
Original assignee: Guangdong DTC Hardware Precision Manufacturing Co Ltd
Current assignee: Guangdong DTC Hardware Precision Manufacturing Co Ltd
Priority date: 2020-01-04
Filing date: 2020-01-04
Publication date: 2020-10-13
Anticipated expiration: 2030-01-04

Abstract

An integrated optimized damping structure of a furniture hinge comprises a hinge cup and a connecting arm which are mutually elastically hinged, opened and closed and matched through a hinge arm component and a hinge arm elastic part, wherein the hinge arm component at least comprises an inner hinge arm which is respectively hinged with the hinge cup and the connecting arm; a damper is arranged between the connecting arm and the positioning piece; the inner hinged arm acts when the hinged cup is elastically hinged to the connecting arm to open and close and drives the damper to reset and slide and/or compress and slide between the connecting arm and the positioning piece so as to realize automatic resetting of the damper and/or damping closing of the furniture hinge. The utility model has the characteristics of simple structure is reasonable, the dependable performance, and it is high to use the flexibility, low in manufacturing cost, long service life, easy production, easy realization, the outward appearance is exquisite and the security is high etc, and the practicality is strong.

Description

Integrated damping optimizing structure of furniture hinge

Technical Field

The utility model relates to an integrated damping structure that optimizes of furniture hinge.

Background

Chinese patent document No. CN103953239B discloses a fixed base for a furniture hinge at 2016, 7, 6, which includes an articulated arm, a connecting arm, a fixed base connected with a wall plate, and a movable cup connected with the door plate; the articulated arm is arranged on the fixed base through a connecting arm and is matched and connected with the movable cup seat through an articulated assembly, and the connecting arm is arranged on the articulated arm, is provided with a locking device and is detachably matched and connected with the fixed base through the locking device; the fixed base is in a straight line shape, and is provided with at least two fixed parts at the front and back positions and is fixedly arranged on the wall plate through the fixed parts; the rear part of the fixed base is provided with an adjusting part, and the relative position between the wall plate and the door plate is adjusted through the adjusting part; the adjusting part is located behind the articulated arm and/or the connecting arm when the hinge is installed. The furniture hinge is characterized by simple and reasonable structure, reliable performance, flexible adjustment, low manufacturing cost, easy production, easy realization, small occupied space, compact connection of all components, exquisite appearance, high safety and the like, and has strong practicability; however, the attenuator setting of this structure is in the linking arm, the linking arm sets up in the articulated arm again, the overall structure that leads to the hinge is comparatively complicated, high in production cost, be not convenient for make and assemble, whole length is great simultaneously, the assembly can occupy more positions when the furniture cabinet body, influence the parking space of the furniture cabinet body, and the attenuator can only adopt automatic reset formula attenuator in addition, it is great to use the limitation, because the problem of production and assembly again when using, the dead phenomenon of card appears very easily in the automatic reset formula attenuator, can't really reach the automatic damping that produces and reset. Therefore, further improvements are necessary.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simple structure is reasonable, the dependable performance, uses the flexibility high, low in manufacturing cost, long service life, easy production, and easy realization, the integrated damping structure that optimizes of furniture hinge that the outward appearance is exquisite and the security is high to overcome the weak point among the prior art.

The integrated optimized damping structure of the furniture hinge comprises a hinge cup (2) and a connecting arm (3) which are mutually elastically hinged, opened and closed and matched through a hinge arm component and a hinge arm elastic part (1), and is characterized in that: the hinged arm assembly at least comprises an inner hinged arm (4), the inner hinged arm (4) is respectively hinged with the hinged cup (2) and the connecting arm (3), a positioning piece (5) is arranged on the inner hinged arm (4), the positioning piece (5) is positioned on the inner hinged arm (4) and is provided with an extension part (6), and the extension part (6) is positioned and acts on the hinged arm elastic piece (1) or the hinged arm assembly at least when stressed; a damper is arranged between the connecting arm (3) and the positioning piece (5); the inner hinged arm (4) acts when the hinged cup (2) is elastically hinged to the connecting arm (3) to open and close and drives the damper to reset and slide and/or compress and slide between the connecting arm (3) and the positioning piece (5) so as to realize automatic resetting of the damper and/or damping closing of the furniture hinge.

The utility model discloses an improvement of above-mentioned structure, compared with the prior art, has following advantage:

1. the positioning piece is arranged on the inner hinged arm in a rotating or swinging mode, the sliding groove portion is formed by surrounding the supporting portion of the positioning piece and the U-shaped connecting arm, the damper is supported on the supporting portion and is reset and/or compressed to slide on the sliding groove portion under the action of the inner hinged arm, and the damper can be directly arranged in the connecting arm in a built-in mode, so that the space occupied by the damper on the furniture hinge is reduced, the overall size of the furniture hinge is reduced, the space position occupied by the furniture hinge when the furniture hinge is assembled on the furniture cabinet is reduced, the storage space of the furniture cabinet is increased, the defect that the damper can be assembled only by adopting an intermediate piece in the prior art is overcome, the production cost of the furniture hinge is reduced, the assembling steps and the assembling process of the furniture hinge are simplified, and the production and assembling requirements of manufacturers are greatly met.

2. The single action part is arranged on the inner hinged arm, the cylinder body of the damper is provided with a groove part consisting of a compression action matching part and a reset action matching part, the action part of the inner hinged arm can extend into the groove part during assembly, and simultaneously, when the hinged cup is hinged to the connecting arm for opening and closing, the action parts can respectively act on the compression action matching part and the reset action matching part, namely, the automatic reset of the damper and the damping closing of the furniture hinge can be realized The furniture hinge is closed in a damping mode, the structure of the furniture hinge is effectively simplified, and the problem that the damper cannot automatically reset or generate damping force due to the fact that the production size is not standard or the assembly position is not accurate is solved, so that the production cost is further reduced, and the assembly steps and the assembly process are simplified.

3. The extension part of the positioning part and the piston rod of the damper directly interact or form a certain gap, so that the connection stability of the extension part and the piston rod of the damper during opening and closing of the furniture can be improved, and meanwhile, the extension part can be positioned and acted on the hinge arm elastic part when stressed and is buckled between the inner hinge arm and the hinge arm elastic part or on the hinge arm elastic part by utilizing at least one buckling position, so that the positioning part is quite firm after being assembled, the problem of separation cannot occur during working, and the assembly stability of the damper is further improved.

4. Because the attenuator can reset through the internal hinge arm is automatic, therefore furniture hinge can select for use automatic formula attenuator that resets or the formula attenuator that resets of non-automatic to improve the application range of hinge product, if having selected for use non-automatic formula attenuator that resets simultaneously, not having the use of the elastic component that resets in the cylinder body, can further reduce manufacturing cost, simplify assembly steps and technology, can also reduce the length of attenuator simultaneously, make furniture hinge's whole volume more light and handy.

5. Be provided with the tortuous section between action portion and the slot part, it is said that action portion respectively with compression action cooperation portion, can carry out the conversion of power through the tortuous section when restoring to the throne and acting on cooperation portion and interacting, frictional loss when not only having reduced cylinder body and internal hinge arm and interacting to prolong furniture hinge's life, the tortuous section can realize furniture hinge's all acceleration simultaneously, or all slow down, or the articulated switching of uniform velocity, certain guide effect still has, thereby improve the connection rationality between each component, stability during operation and user's use experience.

In summary, the novel multifunctional electric heating cooker has the advantages of being simple and reasonable in structure, reliable in performance, high in use flexibility, low in manufacturing cost, long in service life, easy to produce, easy to achieve, exquisite in appearance, high in safety and the like, and is high in practicability.

Drawings

Fig. 1 is an exploded schematic view of a first embodiment of the present invention.

Fig. 2 is a schematic view of an assembly structure according to a first embodiment of the present invention.

Fig. 3 is a schematic view of a positioning member according to a first embodiment of the present invention.

Fig. 4 is a schematic structural view (side sectional view) of the first embodiment of the present invention in an open state.

Fig. 5 is a schematic structural view (a three-dimensional half-sectional view) of the first embodiment of the present invention in an open state.

Fig. 6 is a schematic structural diagram (side sectional view) of the closed state of the first embodiment of the present invention.

Fig. 7 is a schematic structural diagram (a three-dimensional half-sectional view) of the first embodiment of the present invention in a closed state.

Fig. 8 is a schematic view of the assembly structure of the hinge cup, the hinge arm assembly, the damper and the hinge arm elastic member according to the first embodiment of the present invention.

Fig. 9 is a schematic view of an assembly structure of the hinge cup, the hinge arm assembly, and the positioning member according to the first embodiment of the present invention.

Fig. 10 is a schematic structural view (side sectional view) of the second embodiment of the present invention in an open state.

Fig. 11 is a schematic view of a positioning member according to a second embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

First embodiment

Referring to fig. 1 to 9, the integrated optimized damping structure of the furniture hinge comprises a hinge cup 2 and a connecting arm 3 which are elastically hinged to each other to open and close through a hinge arm assembly and a hinge arm elastic member 1, wherein the hinge arm assembly at least comprises an inner hinge arm 4, the inner hinge arm 4 is respectively hinged to the hinge cup 2 and the connecting arm 3, a positioning member 5 and a damper are arranged on the inner hinge arm 4, the positioning member 5 is rotatably or swingably arranged on the inner hinge arm 4 and provided with an extending part 6, the positioning member is positioned and acted on the hinge arm elastic member 1 or the hinge arm assembly at least when being stressed through the extending part 6, and the damper is positioned between the inner hinge arm 4 and the positioning member 5; the inner hinged arm 4 acts when the hinged cup 2 is elastically hinged to the connecting arm 3 to be opened and closed and drives the damper to reset and slide and/or compress and slide between the inner hinged arm 4 and the positioning piece 5, so that the automatic resetting of the damper and/or the damping closing of the furniture hinge are realized.

The positioning piece 5 is provided with a supporting part 7; the connecting arm 3 be the U-shaped, setting element 5 is located the U-shaped of connecting arm 3, is provided with axial region 8 between supporting part 7 and the inner hinge arm 4, and setting element 5 rotates or the swing sets up in the U-shaped of inner hinge arm 4 through axial region 8.

A sliding groove part 9 is formed between the supporting part 7 and the U-shaped connecting arm 3; the damper is supported on the bearing part 7 and slides in a restoring and/or compression manner on the sliding groove part 9 by the action of the inner hinge arm 4.

The extending part 6 extends on the supporting part 7, and a certain included angle is formed between the extending part and the supporting part; wherein, the front end of the extension part 6 is positioned and acted on the hinged arm elastic part 1 or the hinged arm component at least when the damper is compressed and slides, and a certain gap is formed between the top end of the extension part 6 and the inner hinged arm 4.

The hinged arm assembly further comprises an outer hinged arm 10, one end of each of the outer hinged arm 10 and the inner hinged arm 4 is hinged with the hinged cup 2, and the other end of each of the outer hinged arm 10 and the inner hinged arm 4 is hinged with the connecting arm 3; the hinged arm elastic part 1 is arranged at the hinged part of the outer hinged arm 10 and the connecting arm 3; the hinged cup 2 is elastically hinged and opened on the connecting arm 3 through the matching of the external hinged arm 10, the internal hinged arm 4 and the hinged arm elastic piece 1; wherein the front end of the extension part 6 is positioned to act on the hinge arm elastic member 1 at least when the damper is compressed and slid.

The positioning element 5 is made of plastic.

The front end of the extension part 6 is provided with an upper buckling position 11, and the front end of the extension part 6 is positioned and acted on the hinge arm elastic part 1 at least when the damper is compressed and slides and is buckled between the inner hinge arm 4 and the hinge arm elastic part 1 through the upper buckling position 11.

The damper can be an automatic reset damper, the automatic reset damper comprises a cylinder body 13, a piston and a piston rod 14, the cylinder body 13 is made of plastics and is supported on the supporting part 7, a reset elastic part 15 is further arranged in the cylinder body 13, the piston is arranged in the cylinder body 13, one end of the piston rod 14 is positioned and acts on the extending part 6 or forms a certain gap with the extending part 6, the other end of the piston rod 14 is matched and connected with the piston and slides in the cylinder body 13 through the piston in a telescopic mode, one end of the reset elastic part 15 elastically acts on the cylinder body 13, the other end of the reset elastic part elastically acts on the piston, and the cylinder body 13 automatically resets and slides between the inner hinge arm 4 and the positioning part 5 through the action of the reset elastic part 15 and/.

Besides, the damper can also be a non-automatic reset damper, the non-automatic reset damper comprises a cylinder body 13, a piston and a piston rod 14, the cylinder body 13 is made of plastic and is supported on the supporting part 7, the piston is arranged in the cylinder body 13, one end of the piston rod 14 is fixedly arranged on the extending part 6, the other end of the piston rod is connected with the piston in a matched mode and slides in the cylinder body 13 in a telescopic mode through the piston, and the cylinder body 13 automatically resets and slides between the inner hinged arm 4 and the positioning part 5 under the action of the connecting arm 3.

The cylinder body 13 is provided with a compression action matching part 16 and a reset action matching part 17, and a groove part is formed between the compression action matching part 16 and the reset action matching part 17; the inner hinge arm 4 is provided with an active portion 18, and the active portion 18 extends into the groove portion.

The inner hinged arm 4 acts on a compression action matching part 16 of the cylinder body 13 through an acting part 18 when the hinged cup 2 is hinged and closed relative to the connecting arm 3, the cylinder body 13 is compressed and slides between the inner hinged arm 4 and the positioning part 5 through the interaction of the acting part 18 and the compression action matching part 16, the damper generates damping force when the cylinder body 13 is compressed and slides and acts on the extension part 6 through the piston rod 14, and the extension part 6 is positioned and acts on the hinged arm elastic part 1 or the hinged arm assembly through the action of the piston rod 14 so as to finally realize the damping closing of the furniture hinge.

The inner hinged arm 4 acts on a resetting action matching part 17 of the cylinder body 13 through an acting part 18 when the hinged cup 2 is hinged and opened relative to the connecting arm 3, the cylinder body 13 resets and slides between the inner hinged arm 4 and the positioning part 5 through the interaction of the acting part 18 and the resetting action matching part 17, the damper automatically resets when the cylinder body 13 resets and slides, wherein the piston rod 14 is positioned and acts on the extension part 6 or forms a certain gap with the extension part 6 when the damper automatically resets.

A zigzag section is also arranged between the using part 18 and the compression action matching part 16 and/or the reset action matching part 17, and the acting part 18 interacts with the compression action matching part 16 and/or the reset action matching part 17 through the zigzag section when the hinged cup 1 is hinged to the connecting arm 2 for opening and closing; the supporting part 7 is also provided with a reset limiting position 19; the cylinder body 13 slides between the inner hinged arm 4 and the positioning piece 5 in a limiting reset mode through the reset limiting position 19.

The hinged arm elastic piece 1 is a torsion spring, the middle part of the hinged arm elastic piece is provided with a connecting shaft 20, and the hinged arm elastic piece is positioned and arranged at the hinged part of the outer hinged arm 10 and the connecting arm 3 through the connecting shaft 20; the hinge arm elastic part 1 is further provided with at least two support legs which are respectively a first support leg 21 and a second support leg 22, the hinge arm elastic part 1 elastically acts on the connecting arm 3 through the first support leg 21, and the hinge arm elastic part 1 elastically acts on the inner hinge arm 4 through the second support leg 22.

Second embodiment

Referring to fig. 10 and 11, the integrated optimized damping structure of the furniture hinge is different from the first embodiment in that: the front end of the extension part 6 is provided with an upper buckling position 11 and a lower buckling position 12, the front end of the extension part 6 is positioned and acted on the hinge arm elastic part 1 at least when the damper is compressed and slides, and is buckled between the inner hinge arm 4 and the hinge arm elastic part 1 through the upper buckling position 11 and is buckled on the hinge arm elastic part 1 through the lower buckling position 12.

The other parts not described are the same as those of the first embodiment.

The drawings are for illustrative purposes only and are presented in the form of illustrations only, not illustrations as physical or logical, and should not be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Moreover, like or similar reference numerals in the drawings of the embodiments of the present invention correspond to like or similar parts; in the description of the present invention, it should be understood that, if there are any terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "longitudinal", "top", "bottom", "inner", "outer", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, the description is for convenience and simplicity, and it is not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationships in the drawings are used for illustrative purposes only and are not to be construed as limiting the present patent.

Claims

1. The utility model provides an integrated damping structure of optimizing of furniture hinge, includes through hinge arm subassembly, hinge arm elastic component (1) mutual elastic hinge switching complex hinge cup (2) and linking arm (3), its characterized in that: the hinged arm assembly at least comprises an inner hinged arm (4), the inner hinged arm (4) is respectively hinged with the hinged cup (2) and the connecting arm (3), a positioning piece (5) is arranged on the inner hinged arm (4), the positioning piece (5) is positioned on the inner hinged arm (4) and is provided with an extension part (6), and the extension part (6) is positioned and acts on the hinged arm elastic piece (1) or the hinged arm assembly at least when stressed; a damper is arranged between the connecting arm (3) and the positioning piece (5); the inner hinged arm (4) acts when the hinged cup (2) is elastically hinged to the connecting arm (3) to open and close and drives the damper to reset and slide and/or compress and slide between the connecting arm (3) and the positioning piece (5) so as to realize automatic resetting of the damper and/or damping closing of the furniture hinge.

2. The integrated optimized damping structure for furniture hinges according to claim 1, characterized in that: a supporting part (7) is arranged on the positioning part (5), a shaft part (8) is arranged between the supporting part (7) and the inner hinged arm (4), and the connecting arm (3) is U-shaped; the positioning piece (5) is positioned in the U-shaped of the connecting arm (3) and positioned and arranged on the inner hinged arm (4) through the shaft part (8).

3. The integrated optimized damping structure for furniture hinges according to claim 2, characterized in that: a sliding groove part (9) is enclosed between the support part (7) and the U-shaped connecting arm (3); the damper is supported on the supporting part (7) and slides on the sliding groove part (9) in a resetting and/or compression way under the action of the inner hinged arm (4).

4. The integrated optimized damping structure for furniture hinges according to claim 3, characterized in that: the extension part (6) is arranged on the support part (7) in an extending way, and a certain included angle is formed between the extension part and the support part; wherein, the front end of the extension part (6) is positioned and acted on the hinged arm elastic part (1) or the hinged arm component at least when the damper is compressed and slides, and a certain gap is formed between the top end of the extension part (6) and the connecting arm (3) or depends on the top end of the extension part.

5. The integrated optimized damping structure for furniture hinges according to claim 4, characterized in that: the hinged arm assembly further comprises an outer hinged arm (10), one end of the outer hinged arm (10) and one end of the inner hinged arm (4) are respectively hinged with the hinged cup (2), and the other end of the outer hinged arm (10) and the other end of the inner hinged arm are respectively hinged with the connecting arm (3); the hinged arm elastic piece (1) is arranged at the hinged part of the outer hinged arm (10) and the connecting arm (3); the hinged cup (2) is hinged and opened on the connecting arm (3) through the matching elasticity of the external hinged arm (10), the internal hinged arm (4) and the hinged arm elastic piece (1); wherein the front end of the extension part (6) is positioned to act on the hinge arm elastic member (1) at least when the damper slides in compression.

6. The integrated optimized damping structure for furniture hinges according to claim 5, characterized in that: the positioning piece (5) is made of plastic;

the front end of the extension part (6) is provided with an upper buckling position (11), and the front end of the extension part (6) is positioned and acts on the hinged arm elastic part (1) at least when the damper is compressed and slides and is buckled on the hinged arm elastic part (1) or between the connecting arm (3) and the hinged arm elastic part (1) through the upper buckling position (11);

or the front end of the extension part (6) is provided with an upper buckling position (11) and a lower buckling position (12), the front end of the extension part (6) is positioned and acts on the hinge arm elastic part (1) at least when the damper is compressed and slides, and is buckled on the hinge arm elastic part (1) or between the connecting arm (3) and the hinge arm elastic part (1) through the upper buckling position (11), and is buckled on the hinge arm elastic part (1) through the lower buckling position (12).

7. An integrated optimized damping structure for furniture hinges according to any of claims 2-6, characterized in that: the damper is an automatic resetting damper and comprises a cylinder body (13), a piston and a piston rod (14), wherein the cylinder body (13) is made of plastics and is supported on a supporting part (7), a resetting elastic part (15) is further arranged in the cylinder body (13), the piston is arranged in the cylinder body (13), one end of the piston rod (14) is positioned and acts on the extending part (6) or forms a certain gap with the extending part (6), the other end of the piston rod is matched and connected with the piston and slides in the cylinder body (13) through the piston in a telescopic mode, one end of the resetting elastic part (15) elastically acts on the cylinder body (13), the other end of the resetting elastic part elastically acts on the piston, and the cylinder body (13) automatically resets and is positioned and slides between the connecting arm (3) and the positioning part (5) through the action of the resetting elastic part (15) and/or the inner hinge;

or the damper is a non-automatic reset type damper and comprises a cylinder body (13), a piston and a piston rod (14), the cylinder body (13) is made of plastics and is supported on the supporting part (7), the piston is arranged in the cylinder body (13), one end of the piston rod (14) is fixedly arranged on the extending part (6), the other end of the piston rod is connected with the piston in a matched mode and slides in the cylinder body (13) in a telescopic mode through the piston, and the cylinder body (13) automatically resets and slides between the connecting arm (3) and the positioning part (5) under the action of the inner hinged arm (4).

8. The integrated optimized damping structure for furniture hinges according to claim 7, characterized in that: the cylinder body (13) is provided with a compression action matching part (16) and a reset action matching part (17), and a groove part is formed between the compression action matching part (16) and the reset action matching part (17); the inner hinged arm (4) is provided with an acting part (18), and the acting part (18) extends into the groove part;

the inner hinged arm (4) acts on a compression action matching part (16) of the cylinder body (13) through an action part (18) when the hinged cup (2) is hinged and closed relative to the connecting arm (3), the cylinder body (13) is compressed and slides between the connecting arm (3) and the positioning part (5) through the interaction of the action part (18) and the compression action matching part (16), the damper generates damping force when the cylinder body (13) is compressed and slides and acts on the extension part (6) through the piston rod (14), and the extension part (6) is positioned and acts on the hinged arm elastic part (1) or the hinged arm assembly through the action of the piston rod (14) so as to finally realize the damping closing of the furniture hinge;

the hinge cup (2) is articulated when opening relative to connecting arm (3) and is acted on the effect cooperation portion (17) that resets of cylinder body (13) through effect portion (18) in hinge arm (4), cylinder body (13) restore to the throne through the mutual action of effect portion (18), effect cooperation portion (17) that resets and slide between connecting arm (3) and setting element (5), the attenuator is automatic re-setting when cylinder body (13) restore to the throne and slide, wherein, piston rod (14) location effect forms certain clearance on extension (6) or with extension (6) when the attenuator automatic re-setting.

9. The integrated optimized damping structure for furniture hinges according to claim 8, characterized in that: a zigzag section is further arranged between the acting part (18) and the compression action matching part (16) and/or the reset action matching part (17), and the acting part (18) interacts with the compression action matching part (16) and/or the reset action matching part (17) through the zigzag section when the hinged cup (2) is hinged to the connecting arm (3) for opening and closing; the supporting part (7) is also provided with a reset limiting position (19); the cylinder body (13) is reset and slides between the connecting arm (3) and the positioning piece (5) in a limiting mode through the reset limiting position (19).

10. An integrated optimized damping structure for furniture hinges according to claim 5, or 6, or 8, or 9, characterized in that: the hinged arm elastic piece (1) is a torsion spring, the middle part of the hinged arm elastic piece is provided with a connecting shaft (20), and the hinged arm elastic piece is positioned and arranged at the hinged part of the outer hinged arm (10) and the connecting arm (3) through the connecting shaft (20); the hinge arm elastic piece (1) is further provided with at least two support legs which are respectively a first support leg (21) and a second support leg (22), the hinge arm elastic piece (1) elastically acts on the connecting arm (3) through the first support leg (21), and the hinge arm elastic piece (1) elastically acts on the inner hinge arm (4) through the second support leg (22).