Hidden hinge

Abstract

The present invention provides a hidden top and bottom hinge, which includes a first component and a second component, and a connecting force arm hinged to the first component and the second component at both ends, the connecting force arm includes a first force arm and a second force arm, the first component includes a hinge box, a mounting frame, a transmission shaft, a damping assembly and a spring assembly, the mounting frame is arranged in the hinge box, and the transmission shaft, the damping assembly and the spring assembly are all located on the mounting frame; the first force arm abuts against the damping assembly through the transmission shaft, so as to provide a buffering force for the closing rotation of the connecting force arm when the first component and the second component are closed; the second force arm abuts against the spring assembly through the transmission shaft, so as to provide a restoring force for the closing rotation of the connecting force arm when the angle between the first component and the second component is within a preset range, so that the closing speed of the door or window is moderate and smooth.

Description

Technical Field

[0001] The present invention relates to the technical field of hardware accessories, and in particular to a hidden top and bottom hinge. Background Art

[0002] A hinge is a mechanical device used to connect two solid bodies and allow rotation between them.

[0003] Floor hinges are commonly used in opening and closing structures such as doors and windows to ensure the stability of their opening and closing. However, existing floor hinges do not have or cannot provide sufficient closing force for doors or window sashes, resulting in gaps or rebound after the doors and windows are closed; or, when the door is closed, the door is pulled by the hinge or pushed by human hands, and it is easy to hit the door frame or window frame and other structures heavily, making a loud noise, affecting people's use, and the collision can easily cause damage to furniture, so further improvement is needed. Summary of the Invention

[0004] The object of the present invention is to provide a hidden ceiling hinge with closing and buffering functions.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A concealed top and bottom hinge comprises a first component and a second component respectively mounted on a door frame and a door leaf, and a connecting arm hingedly connected to the first component and the second component at both ends, the connecting arm comprising a first arm and a second arm, the first component comprising a hinge box, a mounting frame, a transmission shaft, a damping assembly, and a spring assembly, the mounting frame being mounted in the hinge box, and the transmission shaft, damping assembly, and spring assembly being located on the mounting frame;

[0007] The first lever arm abuts against the damping assembly through the transmission shaft, so as to provide a buffering force for the closing rotation of the connecting lever arm when the first component and the second component are closed;

[0008] The second lever arm abuts against the spring assembly through the transmission shaft, so as to provide a restoring force for the closed rotation of the connecting lever arm when the angle between the first component and the second component is within a preset range.

[0009] It is further configured that the first component further includes a depth adjustment component, a lateral adjustment component and a restoring force adjustment component;

[0010] The depth adjustment assembly is used to adjust the depth of the connecting arm in the up and down directions;

[0011] The lateral adjustment assembly is used to adjust the position of the connecting arm in the left and right directions;

[0012] The restoring force adjustment component is used to adjust the restoring force of the spring component.

[0013] It is further configured that the depth adjustment assembly includes an adjustment screw extending in the up and down directions, the adjustment screw is threadedly connected to the hinge box, and the tail end of the adjustment screw is rotatably connected to the mounting bracket.

[0014] It is further configured that: a guide groove extending in the front-to-back direction is provided on the mounting frame, and a guide block inserted into and sliding in the guide groove is provided at a position corresponding to the guide groove in the hinge box.

[0015] Further configuration: the mounting frame includes a main mounting frame and a sub-mounting frame, the sub-mounting frame is sleeved on the outside of the main mounting frame, the connecting force arm, spring assembly and damping assembly are all arranged on the main mounting frame, and the guide block is arranged on the sub-mounting frame.

[0016] It is further configured that the lateral adjustment assembly includes an eccentric screw passing between the main mounting frame and the auxiliary mounting frame, the axial direction of the eccentric screw is parallel to the front-rear direction, and the tail end thereof is rotatably connected to the main mounting frame.

[0017] It is further configured that: a slider is provided on the main mounting frame, and a guide hole extending in the left-right direction and for inserting the slider is opened on the auxiliary mounting frame at a position corresponding to the slider.

[0018] It is further configured that the restoring force adjustment assembly includes a rotating force arm and a push rod, the push rod extends in the front-to-back direction, the rotating force arm is rotatably provided on the mounting frame, and one end of the rotating force arm is abutted against the end of the spring assembly away from the connecting force arm, and the other end thereof can be pushed by the push rod to rotate around the rotating axis of the rotating force arm.

[0019] It is further configured that the mounting bracket is provided with a positioning block, the positioning block is provided with a positioning hole extending along the front-rear direction, the push rod is passed through the positioning hole and moves along the front-rear direction of the positioning hole.

[0020] It is further configured that the push rod is a stud, and the stud is threadedly connected to the hinge box and the positioning block.

[0021] Compared with the prior art, the solution of the present invention has the following advantages:

[0022] 1. The concealed hinge of the present invention is suitable for use in opening and closing structures such as doors and windows. It utilizes a first and second lever arms to move along a predetermined trajectory via a transmission shaft under the action of a spring assembly and a damping assembly to achieve the opening and closing motion of the door or window. The spring assembly provides a closing force to the closing rotation of the connecting lever arm, enabling the door or window to automatically close and return to its original position when the angle between the first and second members is within a preset range. Furthermore, during the closing process of the door or window, and when the angle between the first and second members is within a preset range, the damping assembly provides a buffering force to the connecting lever arm, ensuring a moderate and smooth closing speed.

[0023] 2. In the concealed top and bottom hinge of the present invention, the front-to-back position of the connecting force arm relative to the hinge box is adjusted by the depth adjustment assembly. By adjusting the depth of the adjusting screw entering the hinge box, the front-to-back position of the mounting frame relative to the hinge box is changed, so that the connecting force arm moves forward and backward relative to the hinge box. The front-to-back adjustment is simple and effective.

[0024] 3. In the concealed top and bottom hinge of the present invention, the left and right position of the connecting force arm relative to the hinge box is adjusted by a lateral adjustment component. The lateral adjustment mechanism utilizes an adjustment screw passing between the main mounting frame and the auxiliary mounting frame. By rotating the adjustment screw, the main mounting frame and the auxiliary mounting frame are dislocated left and right, causing the connecting force arm to move left and right relative to the hinge box, and the left and right adjustment is effective.

[0025] 4. In the concealed top and bottom hinge of the present invention, the relative position of the first component and the second component is adjusted by a height adjustment assembly. By rotating the eccentric bolt, the lever arm slider can slide up and down in the slide groove of the top cover, thereby driving the connecting lever arm to move up and down to achieve the adjustment of the relative position of the first component and the second component. The up and down adjustment is effective.

[0026] 5. In the concealed top and bottom hinge of the present invention, the restoring force of the spring assembly is adjusted by a restoring force adjustment assembly. When the spring becomes fatigued due to long-term use, the push rod is rotated to push the rotating force arm to rotate to lift the spring assembly, thereby changing the compression amount of the spring assembly to achieve the purpose of adjusting its restoring force. This ensures that when the opening range of the door or window sash is within the preset range, it can automatically close and return to its original position. The adjustment is simple and effective, while extending the service life of the spring assembly and reducing costs.

[0027] Additional aspects and advantages of the present invention will be set forth in part in the following description, will become apparent from the following description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 This is a structural diagram of an embodiment of a hidden top and bottom hinge of the present invention;

[0030] Figure 2 This is a split diagram of the first component of the hidden top and bottom hinge of the present invention;

[0031] Figure 3 This is a split diagram of the second mechanism in the hidden top and bottom hinge of the present invention;

[0032] Figure 4 A schematic diagram of the state in which the first component and the second component of the hidden top and bottom hinge of the present invention are closed;

[0033] Figure 5 This is a schematic diagram of the state when the first component and the second component of the hidden top and bottom hinge of the present invention are opened to the maximum angle.

[0034] In the figure, 1. first component; 11. hinge box; 111. guide block; 121. main mounting frame; 1211. first slot; 1212. second slot; 1213. slider; 1214. positioning plate; 122. auxiliary mounting frame; 1221. guide hole; 1222. T-slot; 1223. guide slot; 1224. jack; 13. transmission shaft; 14. spring assembly; 141. spring; 142. spring fixing block; 15. damping assembly; 151. damping tube; 152. top tube; 16. depth adjustment mechanism; 161 , adjusting screw; 162, T-block; 17, lateral adjustment mechanism; 171, eccentric screw; 18, restoring force adjustment assembly; 181, rotating force arm; 182, push rod; 183, positioning block; 184, insert block; 185, limiting groove; 2, second component; 21, top cover; 211, accommodating groove; 212, slide groove; 22, height adjustment assembly; 221, force arm slider; 222, eccentric bolt; 23, force arm guide sleeve; 24, pin; 25, fastening screw; 3, connecting force arm; 31, first force arm; 32, second force arm. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] It should be understood that the terms "front and back", "left and right", and "up and down" in the drawings and the specification are only used to illustrate the structure and working principle of the hidden top and bottom hinge of the present invention in conjunction with the drawings, and cannot be regarded as limiting the present invention.

[0037] See Figures 1 to 5 The present invention relates to a concealed top and bottom hinge, which is suitable for opening and closing structures such as gates, room doors, cabinet doors, and window sashes. It includes a first component 1, a second component 2, and a connecting arm 3, wherein the first component 1 is embedded in the door frame or window frame, and its installation surface is flush with the surface of the door frame or window frame; the second component 2 is embedded in the door sash or window sash, and its installation surface is flush with the surface of the door sash or window sash; the two ends of the connecting arm 3 are rotatably connected to the first component 1 and the second component 2, respectively, thereby realizing the concealed installation of the top and bottom hinge.

[0038] In the present invention, the Z axis is perpendicular to the surface between the first and second components 1 and 2, and the X axis is perpendicular to the surface along the thickness of the first component 1. The Y axis is perpendicular to the Z axis along the length of the first component 1. The "front-back direction" is the Z axis, the "up-down direction" is the X axis, and the "left-right direction" is the Y axis.

[0039] It should be noted that, when the hidden hinge is used, two hinges are usually used in pairs, and the two hinges are symmetrically arranged on the upper and lower parts of the door body. This embodiment is specifically described with the opening and closing movement of the door.

[0040] Specifically, the connecting force arm 3 includes a first force arm 31 and a second force arm 32, and one end of each of the first force arm 31 and the second force arm 32 is hinged to the first component 1. At the same time, the other end of the first force arm 31 and the second force arm 32 away from the first component 1 is hinged to the second component 2 respectively.

[0041] The first component 1 includes a hinge box 11, a mounting frame, a transmission shaft 13, a spring assembly 14, and a damping assembly 15. The mounting frame is placed in the hinge box 11, and the transmission shaft 13, spring assembly 14, and damping assembly 15 are all mounted on the mounting frame. The mounting frame includes a main mounting frame 121 and a secondary mounting frame 122. The secondary mounting frame 122 is sleeved onto the outside of the main mounting frame 121. The thickness of the main mounting frame 121 is adapted to the width of the inner cavity of the secondary mounting frame 122.

[0042] The main mounting frame 121 is provided with a slider 1213 that passes through the sub-mounting frame 122. This slider 1213 locks the front-to-back and vertical positions of the main mounting frame 121 and the sub-mounting frame 122. Correspondingly, a guide hole 1221 extending in the left-right direction is defined on the sub-mounting frame 122 at a position corresponding to the slider 1213. The slider 1213 passes through the sub-mounting frame 122 through the guide hole 1221 and can slide left and right within the guide hole 1221, allowing the main mounting frame 121 to move left and right relative to the sub-mounting frame 122.

[0043] Preferably, in this embodiment, two groups of guide blocks 111 and guide holes 1221 are provided in parallel along the front-to-back direction, which further improves the stability of movement between the main mounting frame 121 and the auxiliary mounting frame 122 .

[0044] In addition, the hinge box 11, the main mounting frame 121 and the auxiliary mounting frame 122 are all split structures, specifically, they can be divided into two parts with structural symmetry along the front-to-back direction, which is convenient for disassembly and assembly.

[0045] Please combine Figure 2 The end of the connecting arm 3 hinged to the second member 2 is rotatably attached to the main mounting frame 121. The spring assembly 14 and the damping assembly 15 are both mounted on the main mounting frame 121 and are capable of elastically acting on the connecting arm 3. Specifically, the mounting frame is provided with a first retaining slot 1211 and a second retaining slot 1212 extending in the front-to-back direction. The first retaining slot 1211 and the second retaining slot 1212 are arranged side by side in the front-to-back direction. The spring assembly 14 is positioned in the first retaining slot 1211 to limit its elastic expansion and contraction path, and the damping assembly 15 is positioned in the second retaining slot 1212 to limit its damping variation path.

[0046] The transmission shaft 13 is provided in each of the first and second slots 1211, 1212. These two transmission shafts 13 are located at the ends of the spring assembly 14 and the damping assembly 15, respectively, near the connecting arm 3. They abut against the spring assembly 14 and the damping assembly 15, respectively, to provide a force redirection effect. The first arm 31 abuts against the spring assembly 14 via the transmission shaft 13 to provide a restoring force for the closing rotation of the connecting arm 3 when the angle between the first component 1 and the second component 2 is within a preset range. The second arm 32 abuts against the damping assembly 15 via the transmission shaft 13 to provide a buffering force for the closing rotation of the connecting arm 3 when the first component 1 and the second component 2 are closed.

[0047] Specifically, please combine Figure 2 、 Figure 4and Figure 5 The preset range of the above-mentioned angle is 0-30°. When the door leaf is opened by applying external force and the door leaf angle is between 0 and 30°, the second component 2 installed on the door leaf pulls the first force arm 31 to overcome the elastic action of the spring assembly 14 through the transmission shaft 13 and moves along a predetermined trajectory. The transmission shaft 13 placed in the first slot 1211 is always subjected to the spring thrust of the spring assembly 14, so that after the external force is removed, the spring assembly 14 pushes the first force arm 31 through the transmission shaft 13 so that the door leaf automatically returns to the closed state; and when the door leaf opening angle is greater than 30°, there is no interaction between the second force arm 32 and the transmission shaft 13 in the door opening direction, so that the door leaf can stop arbitrarily and will not automatically close and return to its original position, and the door leaf rotates from a state parallel to the door frame to a maximum angle of 105° with the door frame.

[0048] Similarly, by applying an external force to close the door, the second member 2 pushes the first and second lever arms 31, 32 to perform a connecting rod motion. When the angle between the door and the door frame is less than 30°, the spring assembly 14 pushes the first lever arm 31 back to its original position via the transmission shaft 13 located in the first retaining groove 1211. Simultaneously, the second lever arm 32 compresses the damping assembly 15 via the transmission shaft 13 located in the guide groove 1223, allowing the door to slowly and smoothly return to its original position, thereby preventing collision between the hinges when the door is closed.

[0049] Please combine Figure 2 The spring assembly 14 includes a spring 141 and a spring fixing block 142 provided at both ends of the spring 141. The spring fixing block 142 is formed with protrusions on both sides along its width direction (not marked in the figure, the same below). The protrusions cooperate with the first slot 1211 to enable the spring 141 to move only along the length direction of the first slot 1211.

[0050] The damping assembly 15 includes a damper, which includes a damping tube 151 and a top tube 152 inserted in the damping tube 151. One end of the top tube 152 can elastically expand and contract in the damping tube 151, and the other end is fixedly connected to the side wall of the second slot 1212 away from one end of the transmission shaft 13, so that when the angle between the door leaf and the door frame is less than 30°, the second force arm 32 applies a thrust to the transmission shaft 13 disposed in the second slot 1212, and then the transmission shaft 13 presses the damping tube 151, so that the top tube 152 located in the damping tube 151 expands and contracts, thereby providing resistance to the rotation of the first force arm 31 to consume the rotation energy of the second force arm 32, so that the door leaf can slowly and smoothly return to its original position.

[0051] In addition, a positioning plate 1214 is provided at the bottom of the second slot 1212 , and the end of the top tube 152 away from the transmission shaft 13 is fixed to the positioning plate 1214 .

[0052] Please combine Figure 2 The first component 1 also includes a depth adjustment mechanism 16, a lateral adjustment mechanism 17 and a restoring force adjustment mechanism, which are used to solve the problem that after long-term use, the door leaf is used for its own weight, resulting in a gap between the door leaf and the door frame or the door cannot be aligned, and the spring component 14 suffers elastic fatigue and cannot automatically recover within a limited range.

[0053] Among them, the depth adjustment mechanism 16 is used to adjust the position of the mounting frame and the hinge box 11 in the front-to-back direction, and includes an adjusting screw 161 extending in the front-to-back direction, and the adjusting screw 161 is threadedly connected to the hinge box 11. At the same time, the end of the adjusting screw 161 located in the hinge box 11 is rotatably connected to the mounting frame. The worker can screw the adjusting screw 161 to move the adjusting screw 161 along its axial direction, thereby driving the mounting frame and the overall component assembled on the mounting frame, and the connecting force arm 3 to move in the front-to-back direction, thereby achieving the purpose of adjusting the depth of the connecting force arm 3, and the depth adjustment range of the connecting force arm 3 in this embodiment is -0.5cm to +2cm.

[0054] Furthermore, the end of the adjusting screw 161 is rotatably connected to the top of the auxiliary mounting frame 122, and a T-block 162 is provided at the end of the adjusting screw 161. At the same time, a T-slot 1222 adapted to the T-block 162 is provided on the auxiliary mounting frame 122, so that when the T-block 162 is located in the T-slot 1222, the T-stage 162 can rotate relative to the mounting frame, but cannot be relatively displaced with the mounting frame along the axial direction of the adjusting screw 161.

[0055] At the same time, since the front and rear positions between the main mounting frame 121 and the auxiliary mounting frame 122 are locked, the auxiliary mounting frame 122 can also drive the main mounting frame 121 to move forward and backward while moving with the adjusting screw 161, thereby achieving the purpose of driving the mounting frame to move forward and backward by rotating the adjusting screw 161, and then realizing the adjustment of the connecting force arm 3 in the depth direction of the hinge box 11.

[0056] Furthermore, the mounting frame is provided with a guide groove 1223 extending in the front-to-back direction, and a guide block 111 is provided at a position corresponding to the guide groove 1223 in the hinge box 11. The guide block 111 is inserted into the guide groove 1223 and slides to limit the moving path of the mounting frame, thereby improving the stability of the mounting frame in adjusting the front-to-back movement.

[0057] Preferably, the guide groove 1223 is provided on the auxiliary mounting frame 122 .

[0058] The lateral adjustment mechanism 17 is used to adjust the left-right position of the connecting arm 3 by adjusting the left-right positions of the main mounting frame 121 and the auxiliary mounting frame 122 to change the left-right position of the connecting arm 3 . The lateral adjustment mechanism 17 includes an eccentric screw 171 rotatably provided on the hinge box 11, and the tail end of the eccentric screw 171 is rotatably connected to the main mounting frame 121. By adjusting the eccentric screw 171, since the auxiliary mounting frame 122 is restricted by the guide block 111 on the hinge box 11, and the slider 1213 on the main mounting frame 121 cooperates with the guide hole 1221 of the auxiliary mounting frame 122, to ensure that the main mounting frame 121 is driven by the eccentric shaft of the eccentric screw 171. The main mounting frame 121 moves left and right relative to the auxiliary mounting frame 122, that is, the main mounting frame 121 can move left and right relative to the hinge box 11, thereby achieving the purpose of adjusting the lateral position of the connecting force arm 3. The lateral adjustment range of the connecting force arm 3 in this embodiment is +2cm to -2cm.

[0059] In addition, it should be noted that the eccentric screw 171 is rotatably connected to the main mounting frame 121, and the main mounting frame 121 is provided with a transverse groove arranged in the up and down directions at the connection position corresponding to the eccentric screw 171 (not shown in the figure, the same below), and the eccentric shaft of the eccentric screw 171 can move in the transverse groove, thereby pushing the main mounting frame 121 to move in the left and right directions.

[0060] The restoring force adjustment assembly 18 is used to adjust the restoring force of the spring assembly 14, which includes a rotating force arm 181 and a push rod 182, wherein the rotating force arm 181 is rotatably provided on the secondary mounting frame 122, and the push rod 182 passes through the hinge box 11 and extends in the front-to-back direction. One end of the rotating force arm 181 abuts against the end of the spring assembly 14 away from the connecting force arm 3, and the other end can be pushed by the push rod 182 to rotate around the rotating shaft fulcrum of the connecting force arm 3, that is, the restoring force adjustment assembly 18 utilizes the principle of leverage, by moving the push rod 182 to push the rotating force arm 181, so that the end of the rotating force arm 181 away from the push rod 182 can push the spring assembly 14 upward, and the purpose of adjusting the compression amount of the spring assembly 14 is achieved by changing the position of the spring assembly 14. The greater the compression amount of the spring assembly 14, the greater its restoring force.

[0061] Preferably, the connecting lever 3 includes two parallel pressure rods (not shown in the figure, the same below) and a connecting portion (not shown in the figure, the same below) connecting the two pressure rods. The two pressure rods are centrally symmetrically arranged with respect to the connecting portion, and each pressure rod and the connecting portion can form a whistle-like structure. In addition, when the push rod 182 is not in contact with the connecting lever 3, the pressure rod closer to the push rod 182 is higher than the pressure rod closer to the spring assembly 14.

[0062] The push rod 182 extends in the front-to-back direction, and a positioning block 183 is provided on the mounting frame. The positioning block 183 is provided with a positioning hole extending in the front-to-back direction (not shown in the figure, the same below). The push rod 182 is passed through the positioning hole and can move forward and backward along the positioning hole, thereby limiting the moving path of the push rod 182 through the positioning block 183.

[0063] Insert blocks 184 are further provided on both end sides of the positioning block 183 in the up and down directions, and a socket 1224 for inserting the plug block 184 is provided on the auxiliary mounting frame 122 at a position corresponding to the plug block 184. The plug-in cooperation between the plug block 184 and the socket 1224 realizes the connection between the positioning block 183 and the auxiliary mounting frame 122, which facilitates disassembly and assembly.

[0064] Preferably, the push rod 182 is a stud, and the stud is threadedly connected to the hinge box 11 and the positioning block 183 , so that the push rod 182 can be moved in the front-to-back direction by rotating the push rod 182 .

[0065] In addition, the rotating force arm 181 is installed on the auxiliary mounting frame 122. Since the auxiliary mounting frame 122 is sleeved on the outside of the main mounting frame 121, the rotating shaft of the rotating force arm 181 needs to pass through the main mounting frame 121. Therefore, the main mounting frame 121 is provided with a limiting groove 185 extending in the left and right directions at the rotating shaft corresponding to the rotating force arm 181 to avoid conflict with the main mounting frame 121 when moving left and right relative to the auxiliary mounting frame 122.

[0066] Preferably, the operating ends of the adjusting screw 161 , the eccentric screw 171 and the push rod 182 are all located on the side of the hinge box 11 opposite to the second member 2 , resulting in a compact structure.

[0067] Please combine Figure 3 The second component 2 includes a top cover 21 and a height adjustment component 22. The top cover 21 is fixed to the door frame. The height adjustment component 22 is arranged on the top cover 21 and is used to adjust the gap size between the first component 1 and the second component 2 when they are in a closed state.

[0068] Preferably, the height adjustment assembly 22 includes a lever arm slider 221 and an eccentric bolt 222 rotatably provided on the lever arm slider 221, the first lever arm 31 and the second lever arm 32 are respectively hinged to the lever arm slider 221, and the eccentric shaft of the eccentric bolt 222 passes through the lever arm slider 221 and is connected to the top cover 21, so that the lever arm slider 221 can be driven by rotating the eccentric bolt 222, so that the first lever arm 31 and the second lever arm 32 can move in the height direction.

[0069] The top cover 21 is L-shaped and defines a receiving groove 211 for accommodating the first and second lever arms 31 and 32. Furthermore, a sliding groove 212 is defined on the top cover 21 for accommodating the lever slider 221. The receiving groove 211 is longer than the sliding groove 212, and the sliding grooves 212 are located on the long and short sides of the L-shaped top cover 21, respectively. Furthermore, the sliding groove 212 is longer than the lever slider 221, and its width matches the width of the lever slider 221, allowing the lever slider 221 to slide along its length within the sliding groove 212. A waist-shaped hole (not marked in the figure, the same below) is provided on the force arm slider 221, and the length direction of the waist-shaped hole is parallel to the hinge axis of the connecting force arm 3 and the force arm slider 221. A circular hole (not marked in the figure, the same below) is provided on the top cover 21, and the operating end (i.e., the bolt head) of the eccentric bolt 222 is located in the waist-shaped hole, and the end of the eccentric shaft of the eccentric bolt 222 is located in the circular hole and is rotatably connected to the top cover 21.

[0070] Therefore, when the eccentric bolt 222 is rotated, it pushes the lever arm slider 221 to move up and down in the chute 212. At the same time, the waist-shaped hole on the lever arm slider 221 also provides clearance for the eccentric shaft of the eccentric bolt 222 to slide up and down in the lever arm slider 221. In other words, the rotation of the eccentric bolt 222 can push the lever arm slider 221 to move in the height direction relative to the top cover 21 in its chute 212 by contacting and pushing the lever arm slider 221. At the same time, it can drive the connecting lever arm 3 to move in the height direction relative to the top cover 21, thereby adjusting the relative positions of the first component 1 and the second component 2 in the height direction, which is convenient to operate.

[0071] In addition, the hinged portion of the arm slider 221 and the connecting arm 3 is located in the accommodating groove 211, and the width of the accommodating groove 211 is greater than the thickness of the hinged portion of the arm slider 221 and the connecting arm 3, so that the arm slider 221 has sufficient clearance to slide.

[0072] Furthermore, the arm slider 221 and the connecting arm 3 are hingedly connected to the arm guide sleeve 23, the arm guide sleeve 23 is fixed to the top cover 21, and the arm slider 221 and the connecting arm 3 hinged part slide in the arm guide sleeve 23, thereby improving the stability of the arm guide sleeve 23 and the connecting arm 3 in movement.

[0073] Furthermore, the top cover 21 is located in the accommodating groove 211 and is also provided with a pin 24 that passes through the hinged part of the force arm slider 221 and the connecting force arm 3. The pin 24 is parallel to the hinge axis of the connecting force arm 3, and the hinged part of the force arm slider 221 and the connecting force arm 3 can slide on the pin 24, thereby achieving the purpose of limiting the moving path of the force arm slider 221.

[0074] The second component 2 is also provided with a fastening screw 25 for locking the top cover 21 and the lever arm slider 221. The fastening screw 25 passes through the lever arm slider 221 and is threadedly connected thereto, so that the fastening screw 25 is rotated to abut against the top cover 21 to achieve relative fixation of the top cover 21 and the lever arm slider 221, thereby achieving relative position fixation of the first component 1 and the second component 2.

[0075] The concealed hinge of the present invention can be used in opening and closing structures such as doors and windows. The first lever arm 31 and the second lever arm 32 move along a predetermined trajectory under the spring assembly 14 and the damping assembly 15 via the transmission shaft 13 to achieve the opening and closing movement of the door or window. The spring assembly 14 can provide a closing force for the closing rotation of the connecting lever arm 3, so that when the angle between the first component 1 and the second component 2 is within the range of 0 to 30 degrees, the door or window can automatically close and return to its original position. At the same time, during the closing process of the door or window, and when the angle between the first component 1 and the second component 2 is within the range of 0 to 30 degrees, the damping assembly 15 can provide a buffering force to the connecting lever arm 3, so that the closing speed of the door or window is moderate and stable.

[0076] In addition, the hidden top and bottom hinge of the present invention is also provided with a depth adjustment component, a lateral adjustment component and a height adjustment component 22, so that the position of the connecting force arm 3 relative to the hinge box 11 in various directions and the relative position of the first component 1 and the second component 2 are adjusted by each component, thereby ensuring the consistency of the gaps in the three directions of the assembly of the door and window sash and the door and window frame, improving the firmness, increasing the service life, improving the tightness of the doors and windows, and making the appearance of the doors and windows more beautiful.

[0077] Among them, the depth component utilizes the adjusting screw 161 connected to the mounting frame. By adjusting the depth of the adjusting screw 161 entering the hinge box 11, the front and rear position of the mounting frame relative to the hinge box 11 is changed, so that the connecting force arm 3 moves forward and backward relative to the hinge box 11, and the front and rear direction adjustment is simple and effective.

[0078] The lateral adjustment mechanism 17 utilizes an adjustment screw 161 that passes between the main mounting frame 121 and the auxiliary mounting frame 122. By rotating the adjustment screw 161, the main mounting frame 121 and the auxiliary mounting frame 122 are displaced left and right, so that the connecting force arm 3 moves left and right relative to the hinge box 11, and the left and right direction adjustment is effective.

[0079] The height adjustment component 22 utilizes a lever arm slider 221 and an eccentric bolt 222 provided in the top cover 21. By rotating the eccentric bolt 222, the lever arm slider 221 can slide up and down in the slide groove 212 of the top cover 21, thereby driving the connecting lever arm 3 to move up and down, so as to adjust the relative position of the first component 1 and the second component 2, and the up and down adjustment is effective.

[0080] In addition, the restoring force adjustment component 18 in the hidden top and bottom hinge of the present invention can be used to adjust the restoring force of the spring component 14. When the spring 141 is fatigued due to long-term use, the push rod 182 is rotated to push the rotating force arm 181 to rotate to lift the spring component 14, and then the compression amount of the spring component 14 is changed to achieve the purpose of adjusting its restoring force. When the opening range of the door or window is within the range of 0 to 30°, it can automatically close and return to its original position. The adjustment is simple and effective, and at the same time, the service life of the spring component 14 is increased, and the cost is reduced.

[0081] The above descriptions are only partial embodiments of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A concealed hinge comprising a first member and a second member mounted on a door frame and a door leaf, respectively, and a connecting arm hingedly connected to the first and second members at both ends, characterized by: The connecting arm includes a first arm and a second arm, the first component includes a hinge box, a mounting bracket, a transmission shaft, a damping assembly and a spring assembly, the mounting bracket is arranged in the hinge box, and the transmission shaft, the damping assembly and the spring assembly are all located on the mounting bracket; The first lever arm abuts against the damping assembly through the transmission shaft, so as to provide a buffering force for the closing rotation of the connecting lever arm when the first component and the second component are closed; The second lever arm abuts against the spring assembly through the transmission shaft, so as to provide a restoring force for the closed rotation of the connecting lever arm when the angle between the first component and the second component is within a preset range; The first component further includes a depth adjustment assembly, a lateral adjustment assembly, and a restoring force adjustment assembly. The depth adjustment assembly is used to adjust the depth of the connecting force arm in the front-to-back direction. The depth adjustment assembly includes an adjustment screw extending in the front-to-back direction. The adjustment screw is threadedly connected to the hinge box, and its tail end is rotatably connected to the mounting bracket. The lateral adjustment assembly is used to adjust the position of the connecting force arm in the left-right direction. The restoring force adjustment assembly is used to adjust the restoring force of the spring assembly. The restoring force adjustment assembly includes a rotating force arm and a push rod, the push rod extends in the front-to-back direction, the rotating force arm is rotatably provided on the mounting frame, and one end of the rotating force arm is abutted against the end of the spring assembly away from the connecting force arm, and the other end can be pushed by the push rod to rotate around the rotating axis of the rotating force arm.

2. The hidden hinge according to claim 1, characterized in that: The mounting frame is provided with a guide groove extending in the front-back direction, and a guide block inserted into the guide groove and sliding is provided at a position corresponding to the guide groove in the hinge box.

3. The hidden hinge according to claim 2, characterized in that: The mounting frame includes a main mounting frame and a sub-mounting frame, the sub-mounting frame is sleeved on the outside of the main mounting frame, the connecting force arm, spring assembly and damping assembly are all arranged on the main mounting frame, and the guide block is arranged on the sub-mounting frame.

4. The hidden hinge according to claim 3, characterized in that: The lateral adjustment assembly includes an eccentric screw passing between the main mounting frame and the auxiliary mounting frame. The axial direction of the eccentric screw is parallel to the front-back direction, and the tail end of the eccentric screw is rotatably connected to the main mounting frame.

5. The hidden top and bottom hinge according to claim 3 or 4, characterized in that: The main mounting frame is provided with a sliding block, and the auxiliary mounting frame is provided with a guide hole extending in the left-right direction and for inserting the sliding block at a position corresponding to the sliding block.

6. The hidden hinge according to claim 1, characterized in that: The mounting frame is provided with a positioning block, the positioning block is provided with a positioning hole extending in the front-rear direction, the push rod is passed through the positioning hole and moves along the front-rear direction of the positioning hole.

7. The hidden hinge according to claim 6, characterized in that: The push rod is a stud, and the stud is threadedly connected to the hinge box and the positioning block.

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