WO2019196409A1

WO2019196409A1 - Hinge

Info

Publication number: WO2019196409A1
Application number: PCT/CN2018/115537
Authority: WO
Inventors: 戚志; 关振铃; 黎善雄
Original assignee: 广东炬森五金精密制造有限公司
Priority date: 2018-04-10
Filing date: 2018-11-15
Publication date: 2019-10-17
Also published as: CN108412355B; CN108412355A

Abstract

A hinge, comprising a hinge cup (3), a base (1), a hinge arm (2) separately connected to the hinge cup (3) and the base (1), and a cushion cylinder (6) and a protection cover (4) which are arranged in the hinge cup (3), and further comprising: a first locking structure provided on one side of the cushion cylinder (6) and locking one side of the protection cover (4) on one sidewall of the hinge cup (3); and a second locking structure provided on the other side of the cushion cylinder (6) and locking the other side of the protection cover (4) on the other sidewall of the hinge cup (3). The position of the cushion cylinder (6) in the hinge cup (3) is limited by means of the first locking structure and the second locking structure in the radial direction of the cushion cylinder (6). The hinge is simple in manufacturing process, easy and convenient to assemble, reasonable in structure, and low in production costs; the cushion cylinder (6) can be firmly locked in the hinge cup (3); the phenomenon that the cushion cylinder (6) is separated from the hinge cup (3) in an operation process of the hinge is prevented; furthermore, the buffer stroke of the cushion cylinder (6) can be adjusted according to actual use conditions, and the practicability of the hinge is improved.

Description

Hinge

Technical field

The invention relates to the technical field of hardware accessories, in particular to a hinge.

Background technique

Chinese Patent No. CN102587779A discloses a furniture hinge with a damper, comprising a hinge cup seat arranged on the furniture door body and a base arranged on the furniture body, the base being connected with one end of the hinge arm, the hinge cup seat and the hinge arm The other end is hinged, and a damper is arranged in the cup body of the hinge cup holder. The damper includes a piston cylinder and a piston rod. The cup body of the hinge cup holder is provided with a sliding slot, and the piston cylinder can slide back and forth on the sliding slot. When the hinge is closed, The articulated arm drives the damper to compress and the damper is reset when the hinge is open. The left and right sides of the chute are provided with a limiting surface that can restrict the left and right movement of the piston cylinder. The cup body of the hinge cup holder is also provided with a damper cover for restricting the movement of the piston cylinder up and down. In order to fix the damper in the hinge cup holder, a damper cover is arranged above the damper, the middle part of the damper cover is a curved surface, and buckles (or screws) are arranged on both sides of the damper cover, so that the damper The manufacturing process of the cover is complicated, the production cost of the hinge is increased, and the position of the damper in the left and right of the hinge cup seat cannot be firmly locked, and is easily released from the hinge cup holder.

The Chinese Patent No. CN204728878U discloses a hinge with a stepless adjustment buffer angle, comprising a hinge cup and a hinge arm hingedly coupled thereto, wherein the hinge cup is provided with a buffer cylinder, and the piston rod of the buffer cylinder is fixed to the hinge cup. The piston cylinder of the buffer cylinder is pressed against the hinge arm, and the buffer cylinder is pushed to be compressed when the hinge arm is closed. The buffer cylinder is provided with an adjusting device for controlling the maximum buffer stroke of the buffer cylinder. The hinge of the patent, the movement of the slider of the driving adjustment device is the way of meshing by the rack and pinion. Since the rack and pinion in the hinge structure are small-sized members, the contact surface between the two is small, so the transmission force is small. In addition, the processing technology of the small-sized rack and pinion is complicated and difficult to process, which makes the cost expensive and increases the cost of the hinge.

Summary of the invention

The object of the present invention is to solve the above problems and provide a hinge with simple manufacturing process, simple assembly, reasonable structure and low production cost, and the buffer cylinder can be firmly locked in the hinge cup to prevent the hinge from being buffered during work. The phenomenon that the cylinder flies out of the hinge cup, and the buffer stroke of the buffer cylinder can be adjusted according to the actual use, and the utility of the hinge is improved.

In order to achieve the above object of the present invention, a hinge of the present invention includes a hinge cup, a base, a hinge arm respectively connected to the hinge cup and the base, a buffer cylinder and a protective cover disposed in the hinge cup, and further includes: setting a first locking structure on one side of the buffer cylinder and locking one side of the protective cover on a side wall of the hinge cup; disposed on the other side of the buffer cylinder and locking the other side of the protection cover a second locking structure of the other side wall of the hinge cup; wherein, by the first locking structure and the second locking structure, a position of the buffer cylinder within the hinge cup is radially defined along the buffer cylinder.

The first locking structure includes: a positioning slot or a positioning hole disposed on an inner wall of a side wall of the hinge cup; a lever that passes through a side of the protection cover from top to bottom; wherein The lever includes a cylindrical body having an upper end inserted in the protective cover and at least one annular boss disposed in a middle of the cylindrical body; wherein the annular boss can be engaged with the positioning groove or the positioning hole, In order to define a position of the buffer cylinder on one side within the hinge cup.

Preferably, the annular boss includes a first annular boss and a second annular boss spaced apart from each other in the axial direction of the cylindrical body.

Further, the lever further includes a rotating rod disposed at an upper end of the cylindrical body to facilitate rotation of the cylindrical body, one end of which is fixedly connected to a sidewall of the cylindrical body, and the other end of which is along the column The body of the body extends radially outward.

Preferably, a bottom end surface of the other end of the rotating rod is flush with a bottom end surface of the first annular boss.

Preferably, one side of the protective cover has an arcuate hole extending through the thickness thereof, and a radius of the arcuate hole matches a radius of the cylindrical body.

Preferably, the upper end surface of the protective cover further defines an annular groove surrounding the arcuate hole and communicating with the arcuate hole, and the radial width of the annular groove is equivalent to the length of the rotating rod.

Preferably, the second locking structure comprises: a positioning piece disposed on an inner wall of the other side wall of the hinge cup and being bendable; a receiving groove disposed on a side wall of the other side of the protection cover; The positioning piece is bent and then engaged in the receiving groove.

Further, the method further includes: a buffer stroke stepless adjustment structure, comprising: a slider disposed in the hinge cup, one end of which is provided with a spring placement hole extending in a direction parallel to an axial direction of the buffer cylinder; a spring disposed in the hole for the resetting action; a reset block disposed on the outer wall of the piston cylinder of the buffer cylinder; wherein the other end of the slider opens a reset block through hole communicating with the spring seating hole The reset block can be brought into contact with a spring in the spring seating hole through the reset block through hole.

Further, the buffer stroke stepless adjustment structure further includes: a cam disposed at a lower end of the cylindrical body for pushing the slider to move to adjust a buffer stroke of the buffer cylinder.

The hinge of the present invention has the following advantages over the prior art:

1. The hinge of the invention has simple manufacturing process, simple assembly, reasonable structure and low production cost, and can lock the buffer cylinder firmly in the hinge cup to prevent the hinge cylinder from flying out of the hinge cup during the working process and causing the hinge to be damaged. The phenomenon can be adjusted according to the actual situation of use, and the cushioning stroke of the buffer cylinder can be adjusted to improve the practicality of the hinge.

2. The hinge of the present invention is provided with a first locking structure and a second locking structure on both sides of the buffer cylinder. The two locking structures fix the protective cover on the hinge cup and define the buffer cylinder in the radial direction of the buffer cylinder. The position inside the cup can be double-locked, and the buffer cylinder can be firmly locked in the hinge cup to prevent the buffer cylinder from flying out of the hinge cup during the working process.

3. The hinge of the present invention has a function of locking one side of the protective cover on the hinge cup to define the position of one side of the buffer cylinder, and also functions to push the slider to move to adjust the buffer stroke of the buffer cylinder, so that the entire hinge The structure is simpler and the reliability of the hinge work is improved.

The invention will be described in detail below with reference to the accompanying drawings.

DRAWINGS

Figure 1 is a perspective view of a first perspective of the hinge of the present invention;

Figure 2 is a cross-sectional view of the hinge of the present invention;

Figure 3 is an enlarged view of a portion A in Figure 2;

Figure 4 is an enlarged view of a portion B of Figure 2;

Figure 5 is a perspective view of a second perspective of the hinge of the present invention;

Figure 6 is an enlarged view of a portion C of Figure 5;

Figure 7 is an exploded view of the hinge of the present invention with the protective cover and the lever removed;

Figure 8 is a partial exploded view of the hinge of the present invention;

Figure 9 is an assembled view of the lever, the slider, the buffer cylinder and the bracket of the present invention;

Figure 10 is an exploded view of Figure 9;

Figure 11 is a schematic structural view of a protective cover of the present invention;

Figure 12 is a schematic structural view of the lever of the present invention;

Figure 13 is a perspective view of a first perspective of the slider of the present invention;

Figure 14 is a perspective view of a second perspective of the slider of the present invention.

detailed description

As shown in Fig. 1, which is a perspective view of the hinge of the present invention, the hinge can be used for furniture. As can be seen from the figure, the hinge of the present invention comprises a hinge cup 3, a base 1, and a hinge arm 2 respectively hinged to the hinge cup 3 and the base 1. a buffer cylinder 6 and a protective cover 4 disposed in the hinge cup, and further comprising: a first locking structure disposed on one side of the buffer cylinder 6 and locking one side of the protective cover 4 on a side wall of the hinge cup 3; a second locking structure on the other side of the cylinder 6 and locking the other side of the protective cover 4 on the other side wall of the hinge cup 3; wherein the buffer cylinder is radially defined along the buffer cylinder 6 by the first locking structure and the second locking structure 6 Position in the hinge cup 3.

Specifically, as shown in FIG. 1 , one end of the hinge arm 2 of the present invention is hingedly hinged on the hinge cup 3 , and the other end of the hinge arm 2 is connected to the base 1 , and the hinge cup 3 has a downward groove in the middle and a connection on the left and right sides. In the ear, a buffer cylinder 6 and a protective cover 4 are mounted in the recess of the hinge cup 3, and the protective cover 4 is located above the buffer cylinder 6 for defining the up and down position of the buffer cylinder 6 in the hinge cup 3. The front end of the piston rod of the buffer cylinder 6 (ie, the end of the piston rod away from the piston cylinder of the buffer cylinder) is fixed to the bracket 9 by snapping, and the bracket 9 is fixedly mounted on the hinge cup 3 by detachable or non-detachable manner (see FIG. 8). - Figure 10) The inner wall of the front side wall, so that the front end of the piston rod of the buffer cylinder 6 is fixed, and the piston cylinder of the buffer cylinder 6 is movably disposed in the hinge cup 3, and can reciprocate relative to the piston rod along the axial direction of the piston rod. Move (ie move back and forth).

The present invention provides a first locking structure and a second locking structure on both sides of the buffer cylinder 6 to define a radial position of the buffer cylinder 6 in the hinge cup 3 through the first locking structure and the second locking structure, wherein the buffer cylinder is The radial position in the hinge cup refers to the position of the buffer cylinder in the radial direction of the piston rod or the piston cylinder of the buffer cylinder 6 in the hinge cup, that is, the buffer cylinder is defined by the two locking structures not to be in the hinge cup Move to prevent the buffer cylinder from coming out of the hinge cup and causing the hinge to fail.

The first locking structure of the present invention can adopt the structure shown in FIG. 2 and FIG. 3, and includes: a positioning groove or a positioning hole 31 which is disposed on the inner wall of a side wall (ie, the left side wall) of the hinge cup 3 (FIG. 2). 3 is a positioning hole 31); a lever 5 that passes through the side of the protective cover 4 (ie, the left side) from top to bottom; wherein the lever 5 includes a cylindrical body whose upper end is inserted in the protective cover 4 51 and at least one annular boss disposed in the middle of the cylindrical body 51; wherein, by engaging the annular boss of the lever 5 with the positioning groove or the positioning hole 31, one side of the buffer cylinder 6 (ie, the left side) The position of the buffer cylinder 6 within the hinge cup 3 is defined.

The lever 5 of the present invention adopts the structure shown in FIG. 12, and includes: a cylindrical body 51; at least one annular boss ringed in the middle of the cylindrical body 51; and a rotating cylindrical shape disposed at the upper end of the cylindrical body 51 a rotating lever 55 of the main body 51; a cam 54 provided at a lower end of the cylindrical main body 51.

Specifically, the upper end of the cylindrical body 51 of the present invention is inserted into the left side of the protective cover 4, and correspondingly, an arcuate hole 42 extending through the thickness thereof is formed on the left side of the protective cover 4 (as shown in FIG. 11). And the radius of the arcuate hole 42 is greater than or equal to the radius of the cylindrical body 51, so that the upper end of the cylindrical body 51 can be inserted just inside the arcuate hole 42.

At least one annular boss is disposed in the middle of the cylindrical body 51. Preferably, the first annular boss 52 and the second annular boss 53 are vertically spaced apart along the axial direction of the cylindrical body 51, and the first ring is The distance between the upper surface of the boss 52 and the lower surface of the second annular boss 53 is less than or equal to the height of the positioning groove or the positioning hole 31 formed in the inner wall of the left side wall of the hinge cup 3, the first annular boss The radius of the 52 and second annular bosses 53 should be greater than the distance between the center of the arcuate hole 42 and the inner wall of the left side wall of the hinge cup 3 after the protective cover 4 is inserted into the cylindrical body 51 located in the hinge cup 3. Therefore, the pair of annular bosses can be engaged in the positioning groove or the positioning hole 31 of the hinge cup and can not be easily taken out, so that the left side of the protective cover 4 through which the lever 5 passes cannot move relative to the hinge cup 3, and then from the left The side defines the position of the buffer cylinder within the hinge cup. In design, the first annular boss 52 and the second annular boss 53 may have the same radius, and the radius of the first annular boss 52 may be slightly larger than the radius of the second annular boss 53.

In order to facilitate the holding or rotating of the cylindrical body 51, the present invention is provided with an elongated rotating rod 55 at the upper portion of the cylindrical body 51. One end of the rotating rod 55 is fixedly coupled to the outer side wall of the cylindrical body 51, and the rotating rod 55 is additionally One end extends outward in the radial direction of the cylindrical body 51. The rotating rod 55 is a stepped rod having a first section and a second section. The upper and lower heights of the first section are equal to the height of the upper portion of the cylindrical body 51 above the upper surface of the first annular boss 52, and the first section is cylindrical. The outer side wall of the main body 51 begins to extend radially outward along the cylindrical body 51 until it is flush with the outer surface of the first annular boss 52; the upper and lower heights of the second section and the upper surface of the cylindrical body 51 and the first annular boss 52 The heights between the lower surfaces are equal, and continue to extend outward from the end of the first segment so that the bottom end surface of the second segment is flush with the bottom end surface of the first annular boss 52.

In order to ensure that the lever 5 is inserted into the arcuate hole 42 of the protective cover 4, the position of the protective cover 4 and the buffer cylinder relative to the hinge cup can be locked from the left side, and a circular arc hole 42 is further formed in the upper end surface of the protective cover 4. And an annular groove 43 (shown in FIG. 11) communicating with the arcuate hole, and the radial width of the annular groove 43 in the radial direction of the arc hole is equivalent to the length of the rotating rod 55, so that the second section of the rotating rod 55 is correctly placed In the arcuate groove 43 of the protective cover 4, the bottom end surface of the second section of the rotating rod 55 abuts against the upper surface of the annular groove 43, and the outer peripheral surface of the second section can abut against the inner wall of the arcuate groove of the protective cover 4, and the rotating rod 55 can The central axis of the cylindrical body 51 is a center of rotation and rotates in the arcuate groove 43.

When assembling the lever and the protective cover, the lever 5 should be placed in the hinge cup 3 from top to bottom, so that a pair of annular bosses of the lever are engaged in the positioning groove or the positioning hole of the hinge cup, and then the protection is protected. The cover passes through the upper end of the lever, so that the rotating lever 55 of the lever is engaged in the arcuate groove of the protective cover. Preferably, in order to facilitate further rotation of the lever, an elongated groove 56 is formed on the upper surface of the lever, and the extending direction of the groove 56 coincides with the extending direction of the rotating rod 55, and a part of the groove is opened on the rotating rod 55. Upper surface.

In addition to defining the position of the buffer cylinder 6 in the hinge cup 3 on the left side by the first locking structure, the present invention also defines the position of the buffer cylinder 6 in the hinge cup 3 on the right side by the second locking structure, the second locking structure. As shown in FIG. 2, FIG. 4 to FIG. 7, the positioning piece 32 is disposed on the inner wall of the other side wall (ie, the right side wall) of the hinge cup 3 and is bendable; and is disposed on the other side of the protective cover 4 ( The accommodating groove 41 on the side wall of the right side (as shown in FIG. 11). The positioning piece 32 has a sheet shape and extends from the inner wall of the right side wall of the hinge cup 3 toward the left side wall, and the position thereof corresponds to the position of the accommodating groove 41 opened in the protective cover 4. When the protective cover 4 is placed in the hinge cup 3 from top to bottom, the positioning piece 32 is just aligned with the accommodating groove 41, and under the force of arranging the protective cover downward, a part of the protruding end of the positioning piece 32 is bent upward and The card is connected to the receiving slot 41. Since the positioning piece 32 is integrally formed with the hinge cup 3, it is not easy to fall off from the hinge cup 3, and a part of the protruding end of the positioning piece is bent upwardly and snapped into the receiving groove 41 of the protective cover 4, so that the protective cover 4 is relatively hinged. The possibility that the cup 3 moves upwards and disengages from the hinge cup 3 is greatly reduced, so that the hinge does not escape from the hinge cup 3 due to the protection cover being detached from the hinge cup 3, thereby improving the safety and life of the hinge.

Further, the hinge of the present invention further includes a buffer stroke stepless adjustment structure. As shown in FIG. 8 , FIG. 10 , FIG. 13 and FIG. 14 , the buffer stroke stepless adjustment structure includes: the movable placement in the hinge cup 3 and the buffer cylinder The slider 7 on the left side of the 6 has a spring-receiving hole 75 extending in the extending direction from the axial direction of the buffer cylinder 6 at one end (toward one end of the bracket); and is disposed in the spring seating hole 75 of the slider 7 for resetting a spring 8; a reset block 61 disposed on the outer wall of the piston cylinder of the buffer cylinder 6; wherein the other end of the slider 7 opens a reset block through hole 71 communicating with the spring seating hole 71 so that the reset block 61 can pass through the reset block The through hole 71 is in contact with the spring 8 in the spring seating hole 71. Further, the cushion stroke stepless adjustment structure further includes a cam 54 provided at a lower end of the cylindrical body 51 of the lever 5 for pushing the slider 7 to move to adjust the cushioning stroke of the buffer cylinder 6.

Specifically, as shown in FIG. 10, the buffer cylinder 6 of the present invention is provided with a sheet-like reset block 61 extending outward from the outer wall of the piston cylinder thereof, and the sheet-shaped reset block 61 is bent and has an axial direction along the buffer cylinder. Projecting in the direction of the bracket to resist against the tab of the spring 8.

As shown in FIG. 13 and FIG. 14 , the slider of the present invention comprises: a slider body having an elongated shape, which is disposed on one side of the buffer cylinder (ie, the left side described above), and is located at the bracket 9 and the buffer cylinder 6 . Between the reset blocks 61; an upper stopper 72 fixedly mounted on one side of the upper surface of the slider body and extending along the axial direction of the buffer cylinder; and a front stop fixedly mounted on the upper surface of the slider body and connected to the end surface of the upper stopper 72 a block 74 (located at one end of the slider body near the bracket), the upper block 72, the front block 74 and the slider body enclose a cam seating groove 73 for arranging the cam 54 of the shift lever 5; at one end of the slider body ( That is, a circular spring-positioning hole 75 is formed toward one end of the bracket 9, the radius of the spring-receiving hole 75 is larger than the outer diameter of the spring 8, and is parallel to the axial direction of the buffer cylinder 6 along the extending direction; The other end (ie, the end away from the bracket 9) defines an elongated reset block through hole 71. Preferably, the reset block through hole 71 is an open hole, that is, the end of the opening is located at the other end of the slider body and faces the buffer. The reset block through hole 71 communicates with the spring seating hole 75 on the side end surface of the cylinder, and the reset block is pierced The aperture of the 71 is smaller than the spring seating hole 75, so that the spring 8 disposed in the spring seating hole 75 does not enter the reset block insertion hole 71, and the aperture of the reset block through hole 71 is slightly larger than the sheet-like reset block 61 of the buffer cylinder 6. The tab is sized such that the tab can extend into the reset block through hole 71 and move forward along the reset block through hole 71 to abut against the spring 8 to compress the spring. Then, the buffer cylinder can be reset under the force of the spring restoring force.

In design, one end of the cam 54 is fixedly disposed at the center of the lower end surface of the cylindrical body 51 of the lever 5, and the other end extends outward in the radial direction of the cylindrical body 51 and protrudes outside the cylindrical body 51, and protrudes from The outer peripheral surface of the portion outside the cylindrical main body 51 is a smoothly transitioning curved surface.

The invention uses the lever to preset the buffering angle between the buffer cylinder and the hinge arm, that is, the slider is adjusted toward the front (toward the bracket) or backward (toward the direction away from the bracket) by the lever to adjust the spring stroke. Shorten or lengthen to achieve the purpose of adjusting the buffer angle.

For example, as shown in FIG. 10, the lever 5 is rotated clockwise, and the cam 54 that drives the lever 5 is rotated, so that the portion of the cam 54 that protrudes outside the cylindrical body 51 is rotated just right to the cam that can be inserted in the slider 7. Positioning in the groove 73, continue to rotate the lever 5, so that the cam 54 abuts against the slider 7 and pushes the slider to move toward the bracket 9, so that the stroke of the spring 8 disposed in the slider can be compressed. After the buffer cylinder is reset, the stroke of the spring-driven buffer cylinder resetting is shortened, so that the hinge closing angle becomes smaller and the buffering function is obtained.

In summary, the hinge of the present invention has the following advantages over the prior art:

1. The hinge of the invention has simple manufacturing process, simple assembly, reasonable structure and low production cost, and can lock the buffer cylinder firmly in the hinge cup to prevent the buffer cylinder from flying out of the hinge cup during the working process, and The buffer stroke of the buffer cylinder can be adjusted according to the actual situation of use, and the utility of the hinge can be improved.

3. The hinge of the present invention, the lever has the function of locking one side of the protective cover on the hinge cup to define the position of one side of the buffer cylinder, and also acts to push the slider to adjust the buffer stroke of the buffer cylinder, so that the whole The hinge structure is simpler and improves the reliability of the hinge work.

Although the present invention has been described in detail above, the present invention is not limited thereto, and those skilled in the art can make modifications according to the principles of the present invention. Therefore, various modifications in accordance with the principles of the present invention should be understood as falling. It is within the scope of protection of the present invention.

Claims

A hinge includes a hinge cup, a base, a hinge arm respectively connected to the hinge cup and the base, a buffer cylinder and a protective cover disposed in the hinge cup, and further comprising:

a first locking structure disposed on one side of the buffer cylinder and locking one side of the protective cover on a side wall of the hinge cup;

a second locking structure disposed on the other side of the buffer cylinder and locking the other side of the protective cover on the other side wall of the hinge cup;

Wherein, the position of the buffer cylinder in the hinge cup is defined along the radial direction of the buffer cylinder by the first locking structure and the second locking structure.
The hinge of claim 1 wherein said first locking structure comprises:

a positioning groove or a positioning hole disposed on an inner wall of a side wall of the hinge cup;

a lever that passes through the side of the protective cover from top to bottom;

Wherein the lever comprises a cylindrical body having an upper end inserted in the protective cover and at least one annular boss disposed in a middle of the cylindrical body;

Wherein, the annular boss can be engaged with the positioning groove or the positioning hole to define a position of the buffer cylinder on one side in the hinge cup.
The hinge according to claim 2, wherein said annular boss comprises a first annular boss and a second annular boss spaced apart from each other in the axial direction of said cylindrical body.
The hinge according to claim 3, wherein said lever further comprises a rotary lever provided at an upper end of said cylindrical body for facilitating rotation of said cylindrical body, one end thereof and a side wall of said cylindrical body The fixed connection has its other end extending outward in the radial direction of the cylindrical body.
The hinge according to claim 4, wherein a bottom end surface of the other end of the rotating rod is flush with a bottom end surface of the first annular boss.
The hinge according to claim 5, wherein one side of the protective cover has an arcuate hole extending through its thickness, and a radius of the arcuate hole matches a radius of the cylindrical body.
The hinge according to claim 6, wherein the upper end surface of the protective cover further defines an annular groove surrounding the arcuate hole and communicating with the arcuate hole, the radial width of the annular groove and the rotating rod The length is equivalent.
The hinge according to any one of claims 1 to 7, wherein the second locking structure comprises:

a positioning piece that is disposed on an inner wall of the other side wall of the hinge cup and bendable;

a receiving groove disposed on a sidewall of the other side of the protective cover;

The positioning piece is bent and then engaged in the receiving groove.
The hinge according to claim 2, further comprising a buffer stroke stepless adjustment structure comprising:

a slider disposed in the hinge cup, one end of which has a spring setting hole extending in a direction parallel to an axial direction of the buffer cylinder;

a spring disposed in the spring seating hole of the slider for resetting;

a reset block disposed on an outer wall of the piston cylinder of the buffer cylinder;

Wherein, the other end of the slider opens a reset block through hole communicating with the spring setting hole, so that the reset block can pass through the reset block through hole to be in contact with the spring in the spring seating hole.
The hinge according to claim 9, wherein the buffer stroke stepless adjustment structure further comprises:

A cam disposed at a lower end of the cylindrical body for urging the slider to move to adjust a buffer stroke of the buffer cylinder.