Extremely-narrow three-dimensional adjustable hidden hinge

Abstract

The extremely-narrow three-dimensional adjustable hidden hinge comprises a movable hinge piece, a fixed hinge piece, a hinge piece, a first installation base and a second installation base, transverse kidney-shaped holes are formed in the two ends of the first installation base, first screws penetrate through the transverse kidney-shaped holes to be in threaded connection with the movable hinge piece, adjusting holes and opening grooves are formed in the two ends of the second installation base, and the second installation base is in threaded connection with the movable hinge piece. The opening groove is formed in the end, away from the middle of the second installation base, of the adjusting hole, the opening direction of the opening groove deviates from the adjusting hole, the two ends of an inner cavity of the fixed hinge piece are each provided with two connecting pieces, the two connecting pieces are arranged at the bottoms of the two ends of the second installation base respectively, and threaded holes and clamping holes are formed in the connecting pieces. The second screw penetrates through the adjusting hole to be connected into the threaded hole in a threaded mode and can slide up and down along the adjusting hole, the third screw sequentially penetrates through the open groove and the clamping hole to be connected with the fixed hinge piece in a threaded mode, the rod portion of the third screw is connected with the clamping hole in a clamped mode, and the hinge is suitable for a door plate with the small thickness.

Description

Technical Field

[0001] The utility model relates to the technical field of door and window hardware, in particular to an extremely narrow three-dimensional adjustable concealed hinge. Background Art

[0002] The thickness of wardrobe, cabinet or wine cabinet door panels on the market is generally below 25mm. The opening and closing adopts the traditional old-style hinges and flat hinges as the way to connect the frame end and the door end. The maximum opening and closing angle of the old-style hinges can only reach 115 degrees, and the link axis of the flat hinge is exposed. The above two products are not only exposed, but also cannot achieve the hidden effect. The door gap is too large after opening the door leaf, and the door closing is easy to pinch the hand, and it affects the appearance and use space on the cabinet. Chinese utility model patent CN212478883U discloses a three-dimensional adjustable concealed hinge, which can achieve the hidden effect, the maximum opening and closing angle can reach 180°, and the door gap is small after opening the door leaf, which can avoid pinching people's hands, but the minimum width of this hinge is 23MM, which is not suitable for door panels with smaller thickness. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides an extremely narrow three-dimensional adjustable concealed hinge, which is suitable for door panels with smaller thickness.

[0004] The technical solution of the utility model is achieved in this way:

[0005] An extremely narrow three-dimensional adjustable concealed hinge comprises a moving leaf piece, a fixed leaf piece and a hinge connecting the moving leaf piece and the fixed leaf piece, the moving leaf piece and the fixed leaf piece are both provided with an inner cavity, the inner cavity of the moving leaf piece is provided with a first mounting seat, the inner cavity of the fixed leaf piece is provided with a second mounting seat, and two ends of the hinge are respectively hinged to the first mounting seat and the second mounting seat;

[0006] Both ends of the first mounting seat are provided with transverse waist-shaped holes along the width direction thereof, and the first screw passes through the transverse waist-shaped holes and is screwed to the movable leaf piece;

[0007] Both ends of the second mounting seat are provided with an adjustment hole and an opening groove, the adjustment hole and the opening groove are connected, the opening groove is arranged at an end of the adjustment hole away from the middle of the second mounting seat, the opening direction of the opening groove is away from the adjustment hole, the width of the opening groove is greater than the width of the adjustment hole, and two connecting pieces are provided at both ends of the inner cavity of the fixed page sheet, the two connecting pieces are respectively arranged at the bottom of the two ends of the second mounting seat, and threaded holes and clamping holes are opened on the connecting pieces. The second screw passes through the adjustment hole and is screwed in the threaded hole, and the second screw can slide up and down along the adjustment hole. The third screw passes through the opening groove and the clamping hole in turn and is screwed to the fixed page sheet, and the rod of the third screw is clamped with the clamping hole.

[0008] Preferably, the shank of the third screw is interference fit with the clamping hole.

[0009] Preferably, the rod portion of the third screw is provided with an annular slot, and the slot is engaged with the hole.

[0010] Preferably, the second screw is a screw with a gasket, and the top surfaces at both ends of the second mounting seat are concave to form grooves for the gasket to slide up and down, and the adjustment hole and the opening groove are arranged in the middle of the groove.

[0011] Preferably, the top surface of one or more of the first screw, the second screw and the third screw is recessed with an adjustment groove for inserting a screwdriver bit.

[0012] Preferably, the first mounting seat, the second mounting seat and the connecting piece are all made of wear-resistant plastic.

[0013] Preferably, the second mounting seat includes a main body and two ears connected to both ends of the main body, the adjustment hole and the opening slot are both arranged on the ears, both ends of the inner cavity of the fixed page sheet are provided with step portions, a first sliding slot for sliding the main body is formed between the two step portions, and a second sliding slot for sliding the ears is formed above the step portions.

[0014] The connecting piece is arranged in the second sliding groove.

[0015] Preferably, the moving leaf piece has a length of 75 to 85 mm, a width of 13 to 15 mm, and a thickness of 15 to 17 mm;

[0016] The length of the fixed page piece is 75-85 mm, the width is 13-15 mm, and the thickness is 15-17 mm.

[0017] Preferably, a third sliding groove is provided in the first mounting seat, a fourth sliding groove is provided in the second mounting seat, and both ends of the hinged member are slidably matched with the third sliding groove and the fourth sliding groove respectively.

[0018] Preferably, the hinge comprises a first crank arm, a second crank arm, a third crank arm, a first rotating shaft, a second rotating shaft, a third rotating shaft, a fourth rotating shaft and a fifth rotating shaft, the first rotating shaft and the second rotating shaft are respectively arranged at two ends of the first crank arm, the first rotating shaft is slidably matched with the third sliding groove, the second rotating shaft is rotatably arranged in the inner cavity of the fixed page piece, the second crank arm and the third crank arm are located on both sides of the first crank arm, one end of the second crank arm and the third crank arm are connected to the third rotating shaft, the other ends of the second crank arm and the third crank arm are connected to the fourth rotating shaft, the third rotating shaft is rotatably arranged in the inner cavity of the moving page piece, the fourth rotating shaft is slidably matched with the fourth sliding groove, and the middle part of the first crank arm, the middle part of the second crank arm and the middle part of the third crank arm are hinged through the fifth rotating shaft.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) The movable leaf piece is installed in a preset groove of the door panel, and the fixed leaf piece is installed in a preset groove of the door frame. The movable leaf piece and the fixed leaf piece are hinged by a hinge. The first screw passes through the transverse waist-shaped hole of the first mounting seat and is screwed to the movable leaf piece. When the two first screws at both ends of the first mounting seat are rotated and loosened, the first mounting seat and the movable leaf piece can slide left and right relative to each other to adjust the left and right distance between the door leaf and the door frame; both ends of the second mounting seat are provided with adjustment holes, and the second screw passes through the adjustment hole and is screwed to the threaded hole of the connecting piece. The second screw can slide up and down along the adjustment hole to adjust the left and right distance between the door leaf and the door frame. The second mounting seat can slide up and down relative to the fixed page piece. When the two second screws at both ends of the second mounting seat are rotated and loosened, the second mounting seat and the fixed page piece can slide up and down relatively to each other to adjust the up and down distance between the door leaf and the door frame. Open grooves are provided at both ends of the second mounting seat and at one end away from the adjustment hole and away from the middle of the second mounting seat. The third screw passes through the open groove and the card hole in sequence and is screwed to the fixed page piece. When the third screw rotates, the third screw drives the connecting piece, the second screw and the second mounting seat to move forward and backward to adjust the front and back distance between the door leaf and the door frame.

[0021] (2) Existing three-dimensional adjustable hinges generally adjust the front-to-back and up-down distances between the door leaf and the door frame by means of two screws arranged on the left and right. This will make the required width of the fixed leaf piece larger. In the present application, the second screw passes through the adjustment hole of the second mounting seat and is screwed into the threaded hole of the connecting piece. The third screw passes through the opening groove and the clamping hole in turn and is screwed into the fixed leaf piece. The opening groove and the adjustment hole are arranged up and down. The second screw and the third screw are also arranged up and down. This can reduce the space for the horizontal arrangement, thereby reducing the width of the fixed leaf piece and is suitable for door panels with smaller thickness.

[0022] (3) The width of the opening slot is greater than the width of the adjustment hole, which facilitates the opening of the adjustment hole and the opening slot and simplifies the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model;

[0024] Figure 2 This is an exploded view of the first embodiment of the utility model;

[0025] Figure 3 It is a three-dimensional cross-sectional view of the first embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the fixed page piece in the first embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the second mounting base in the first embodiment of the utility model;

[0028] Figure 6It is a three-dimensional cross-sectional view of the second screw, the third screw and the connecting piece in the first embodiment of the utility model;

[0029] Figure 7 It is a three-dimensional structural schematic diagram of the hinge in the first embodiment of the utility model;

[0030] Figure 8 It is a three-dimensional cross-sectional view of the second screw, the third screw and the connecting piece in the second embodiment of the utility model.

[0031] Figure ID:

[0032] 1-moving page; 2-fixed page; 21-step portion; 22-first sliding groove; 23-second sliding groove; 3-hinge; 31-first crank arm; 32-second crank arm; 33-third crank arm; 34-first rotating shaft; 35-second rotating shaft; 36-third rotating shaft; 37-fourth rotating shaft; 38-fifth rotating shaft; 4-first mounting seat; 41-transverse waist hole; 42-third sliding groove; 5-second mounting seat; 51-adjusting hole; 52-opening groove; 53-recessed groove; 54-main body; 55-ear; 56-fourth sliding groove; 6-first screw; 7-second screw; 8-third screw; 81-slot; 9-connecting piece; 91-threaded hole; 92-slot; 10-cover plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] Embodiment 1

[0036] See also Figures 1 to 5, an extremely narrow three-dimensional adjustable concealed hinge, comprising a moving page piece 1, a fixed page piece 2 and a hinge 3 connecting the moving page piece 1 and the fixed page piece 2, the moving page piece 1 and the fixed page piece 2 are both provided with an inner cavity, the inner cavity of the moving page piece 1 is provided with a first mounting seat 4, the inner cavity of the fixed page piece 2 is provided with a second mounting seat 5, and the two ends of the hinge 3 are respectively hinged to the first mounting seat 4 and the second mounting seat 5; both ends of the first mounting seat 4 are provided with transverse waist-shaped holes 41 along the width direction thereof, and a first screw 6 passes through the transverse waist-shaped hole 41 and is screwed to the moving page piece 1 so that the first mounting seat 4 can slide left and right relative to the moving page piece 1;

[0037] Both ends of the second mounting seat 5 are provided with an adjusting hole 51 and an opening groove 52, the adjusting hole 51 and the opening groove 52 are connected, the opening groove 52 is arranged at one end of the adjusting hole 51 away from the middle of the second mounting seat 5, the opening direction of the opening groove 52 is away from the adjusting hole 51, and the width of the opening groove 52 is greater than the width of the adjusting hole 51, and two connecting pieces 9 are provided at both ends of the inner cavity of the fixed page sheet 2, and the two connecting pieces 9 are respectively arranged at the bottom of the two ends of the second mounting seat 5, and the connecting pieces 9 are provided with threaded holes 91 and clamping holes 92. The second screw 7 passes through the adjusting hole 51 and is screwed in the threaded hole 91, and the second screw 7 can slide up and down along the adjusting hole 51, and the third screw 8 passes through the opening groove 52 and the clamping hole 92 in turn and is screwed to the fixed page sheet 2, and the rod of the third screw 8 is clamped with the clamping hole 92.

[0038] The movable leaf piece 1 is installed in the preset groove of the door panel, and the fixed leaf piece 2 is installed in the preset groove of the door frame. The movable leaf piece 1 and the fixed leaf piece 2 are hinged by the hinge 3. The first screw 6 passes through the transverse waist hole 41 of the first mounting seat 4 and is screwed to the movable leaf piece 1. When the two first screws 6 at both ends of the first mounting seat 4 are rotated and loosened, the first mounting seat 4 and the movable leaf piece 1 can slide left and right relatively to adjust the left and right distance between the door leaf and the door frame; both ends of the second mounting seat 5 are provided with adjustment holes 51, and the second screw 7 passes through the adjustment hole 51 and is screwed to the threaded hole 91 of the connecting piece 9, and the second screw 7 can slide up and down along the adjustment hole 51 so that The second mounting seat 5 can slide up and down relative to the fixed leaf piece 2. When the two second screws 7 at both ends of the second mounting seat 5 are rotated and loosened, the second mounting seat 5 and the fixed leaf piece 2 can slide up and down relatively to adjust the vertical distance between the door leaf and the door frame. The second mounting seat 5 is provided with an open slot 52 at both ends and at one end away from the adjustment hole 51 and away from the middle of the second mounting seat 5. The third screw 8 passes through the open slot 52 and the clamping hole 92 in sequence and is screwed to the fixed leaf piece 2. When the third screw 8 rotates, the third screw 8 drives the connecting piece 9, the second screw 7 and the second mounting seat 5 to move forward and backward to adjust the front and rear distance between the door leaf and the door frame. Therefore, the door leaf can be adjusted left and right, up and down, and front and back respectively by the first screw 6, the second screw 7 and the third screw 8, so as to achieve three-dimensional adjustment.

[0039] The existing three-dimensional adjustable hinges generally adjust the front-to-back and up-down distances between the door leaf and the door frame by two screws arranged on the left and right, which will make the required width of the fixed leaf piece larger. In this application, the second screw 7 passes through the adjustment hole 51 of the second mounting seat 5 and is screwed into the threaded hole 91 of the connecting plate 9. The third screw 8 passes through the opening slot 52 and the clamping hole 92 in sequence and is screwed with the fixed leaf piece 2. The opening slot 52 and the adjustment hole 51 are arranged up and down, and the second screw 7 and the third screw 8 are also arranged up and down, which can reduce the space for horizontal arrangement, thereby reducing the width of the fixed leaf piece, and is suitable for door panels with smaller thickness. Among them, the length of the moving leaf piece 1 is 75-85mm, the width is 13-15mm, and the thickness is 15-17mm; the length of the fixed leaf piece 2 is 75-85mm, the width is 13-15mm, and the thickness is 15-17mm. In this embodiment, the moving leaf piece 1 has a length of 80 mm, a width of 14 mm, and a thickness of 16 mm. The moving leaf piece 1 has a length of 80 mm, a width of 14 mm, and a thickness of 16 mm. It is suitable for door panels with a thickness of 18 mm or above. The achievable adjustment range is: left and right adjustable by ±1 mm, up and down adjustable by ±1.5 mm, and front and back (i.e., door gap) size adjustable by ±2 mm.

[0040] In addition, the width of the opening groove 52 is greater than the width of the adjusting hole 51, which facilitates the opening of the adjusting hole 51 and the opening groove 52, and the manufacturing process is simpler. The third screw 8 can limit the upward and downward movable range of the second mounting seat 5. If the width of the opening groove 52 is less than or equal to the width of the adjusting hole 51, the third screw 8 passing through the opening groove 52 can slide in the adjusting hole 51, and the third screw 8 cannot limit the upward and downward movable range of the second mounting seat 5. Moreover, when the width of the opening groove 52 is less than the width of the adjusting hole 51, the processing difficulty is great.

[0041] In this embodiment, see Figure 3 and Figure 6 The rod of the third screw 8 is interference-fitted with the clamping hole 92 to achieve clamping connection between the rod of the third screw 8 and the clamping hole 92 , thereby clamping the third screw 8 on the connecting plate 9 .

[0042] Preferably, see Figures 1 to 3 The second screw 7 is a screw with a gasket. The top surfaces of both ends of the second mounting seat 5 are concave to form grooves 53 for the gasket to slide up and down. The adjustment hole 51 and the opening groove 52 are arranged in the middle of the groove 53. The gasket in the screw with a gasket can slide in the groove 53 by setting the groove 53. The groove 53 cooperates with the gasket to play a role of sliding guide when the second mounting seat 5 slides up and down. Moreover, the gasket is pressed in the groove 53 to increase the contact area between the second screw 7 and the second mounting seat 5, and the friction between the two is increased, thereby improving the stability of the second mounting seat 5.

[0043] Among them, the top surface of one or more of the first screw 6, the second screw 7 and the third screw 8 is recessed with an adjustment groove for the screwdriver bit to be inserted. A screwdriver matching the adjustment groove is used to act on the adjustment groove, so that the first screw 6, the second screw 7 or the third screw 8 can be twisted when the screwdriver is turned, so that the hinge can be adjusted left and right, up and down, front and back. More preferably, the adjustment groove is a hexagonal groove, and correspondingly, the screwdriver is a hexagonal key. In fact, the adjustment groove can be selected from a slotted slot, a cross slot, a plum blossom slot or a slot type, and the screwdriver bit can be selected from a slotted bit, a cross bit, a plum blossom bit or other shaped bits that are adapted to the adjustment slot.

[0044] Preferably, the first mounting seat 4, the second mounting seat 5 and the connecting plate 9 are all made of wear-resistant plastic, which can reduce the friction between the first mounting seat 4 and the hinge 3, between the second mounting seat 5 and the hinge 3, between the second mounting seat 5 and the connecting plate 9, and between the connecting plate 9 and the second mounting seat 5, thereby achieving a smooth sound elimination effect and avoiding friction noise when closing the door or inability to open and close smoothly.

[0045] In this embodiment, see Figures 2 to 5 The second mounting seat 5 includes a main body 54 and two ears 55 connected at both ends of the main body 54. The adjustment hole 51 and the opening groove 52 are both arranged on the ears 55. Step portions 21 are provided at both ends of the inner cavity of the fixed page sheet 2. A first sliding groove 22 for the main body 54 to slide is formed between the two step portions 21. A second sliding groove 23 for the ears 55 to slide is formed above the step portion 21. The connecting piece 9 is arranged in the second sliding groove 23. The first sliding groove 22 and the two second sliding grooves 23 are respectively provided for the main body 54 and the two ears 55 to slide, and the distance between the two step portions 21 determines the size of the first sliding groove 22, thereby limiting the up and down sliding range of the main body 54. Preferably, a cover plate 10 is provided on the top of the two second sliding grooves 23 to cover the second sliding groove 23, so as to protect the second screw 7 and the third screw 8 and prevent the second screw 7 and the third screw 8 from being misoperated. In addition, cover plates 10 can be provided at both ends of the first mounting seat 4 to protect the first screw 6. In order to facilitate the understanding of the structure of this hinge, in Figure 3 In the figure, only one end of the second mounting seat 5 is provided with the second screw 7, the third screw 8 and the connecting piece 9. In fact, the second screw 7, the third screw 8 and the connecting piece 9 are provided at both ends of the second mounting seat 5.

[0046] In this embodiment, see Figure 2 and Figure 3, a third sliding groove 42 is provided in the first mounting seat 4, a fourth sliding groove 56 is provided in the second mounting seat 5, and both ends of the hinge 3 are respectively slidably matched with the third sliding groove 42 and the fourth sliding groove 56. The moving leaf piece 1 is installed on the door leaf, and the fixed leaf piece 2 is installed on the door frame. When the door is closed, the moving leaf piece 1 rotates and drives one end of the hinge 3 to slide downward in the third sliding groove 42, and the other end of the hinge 3 slides downward in the fourth sliding groove 56, so that the hinge 3 can be hidden in the inner cavity of the moving leaf piece 1 and the inner cavity of the fixed leaf piece 2, thereby covering the hinge 3 and preventing the hinge 3 from being exposed, thereby achieving a hidden effect.

[0047] For details, see Figure 2 , Figure 3 and Figure 7 The hinge 3 includes a first crank arm 31, a second crank arm 32, a third crank arm 33, a first rotating shaft 34, a second rotating shaft 35, a third rotating shaft 36, a fourth rotating shaft 37 and a fifth rotating shaft 38. The first rotating shaft 34 and the second rotating shaft 35 are respectively arranged at both ends of the first crank arm 31, the first rotating shaft 34 is slidably matched with the third sliding groove 42, the second rotating shaft 35 is rotatably arranged in the inner cavity of the fixed page piece 2, the second crank arm 32 and the third crank arm 33 are located on both sides of the first crank arm 31, one end of the second crank arm 32 and the third crank arm 33 are connected to the third rotating shaft 36, the other end of the second crank arm 32 and the third crank arm 33 are connected to the fourth rotating shaft 37, the third rotating shaft 36 is rotatably arranged in the inner cavity of the moving page piece 1, the fourth rotating shaft 37 is slidably matched with the fourth sliding groove 56, and the middle part of the first crank arm 31, the middle part of the second crank arm 32 and the middle part of the third crank arm 33 are hinged through the fifth rotating shaft 38. When the door is opened, the moving leaf piece 1 and the fixed leaf piece 2 move away from each other, the first rotating shaft 34 moves upward in the third sliding groove 42, the fourth rotating shaft 37 moves upward in the fourth sliding groove 56, and under the hinged action of the five rotating shafts, the first turning arm 31, the second turning arm 32, and the third turning arm 33 are exposed from the inner cavity of the moving leaf piece 1 and the inner cavity of the fixed leaf piece 2; when the door is closed, the moving leaf piece 1 and the fixed leaf piece 2 approach each other, the first rotating shaft 34 moves downward in the third sliding groove 42, the fourth rotating shaft 37 moves downward in the fourth sliding groove 56, and under the hinged action of the five rotating shafts, the first turning arm 31, the second turning arm 32, and the third turning arm 33 are hidden in the inner cavity of the moving leaf piece 1 and the inner cavity of the fixed leaf piece 2.

[0048] Embodiment 2

[0049] See also Figure 8 Different from the first embodiment, the rod of the third screw 8 is not interference fit with the clamping hole 92, but an annular clamping groove is provided on the rod of the third screw 8, and the clamping groove of the third screw 8 is clamped with the clamping hole 92 to achieve the fixation of the third screw 8 and the connecting plate 9.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An extremely narrow three-dimensional adjustable concealed hinge, characterized in that: The invention comprises a moving leaf piece (1), a fixed leaf piece (2) and a hinge (3) connecting the moving leaf piece (1) and the fixed leaf piece (2); the moving leaf piece (1) and the fixed leaf piece (2) are both provided with an inner cavity; the inner cavity of the moving leaf piece (1) is provided with a first mounting seat (4); the inner cavity of the fixed leaf piece (2) is provided with a second mounting seat (5); and two ends of the hinge (3) are respectively hinged to the first mounting seat (4) and the second mounting seat (5); Both ends of the first mounting seat (4) are provided with transverse waist-shaped holes (41) along the width direction thereof, and the first screw (6) passes through the transverse waist-shaped holes (41) and is screwed to the moving leaf piece (1); Both ends of the second mounting seat (5) are provided with an adjustment hole (51) and an opening groove (52), the adjustment hole (51) and the opening groove (52) are communicated, the opening groove (52) is arranged at one end of the adjustment hole (51) away from the middle of the second mounting seat (5), the opening direction of the opening groove (52) is away from the adjustment hole (51), the width of the opening groove (52) is greater than the width of the adjustment hole (51), and two connecting pieces (9) are provided at both ends of the inner cavity of the fixed page sheet (2), and the two connecting pieces (9) are connected to each other. The connecting pieces (9) are respectively arranged at the bottom of both ends of the second mounting seat (5); the connecting piece (9) is provided with a threaded hole (91) and a clamping hole (92); the second screw (7) passes through the adjusting hole (51) and is screwed into the threaded hole (91); the second screw (7) can slide up and down along the adjusting hole (51); the third screw (8) passes through the opening groove (52) and the clamping hole (92) in sequence and is screwed into the fixed page piece (2); the rod of the third screw (8) is clamped into the clamping hole (92).

2. The extremely narrow three-dimensional adjustable concealed hinge according to claim 1, characterized in that: The rod portion of the third screw (8) is interference fit with the clamping hole (92).

3. The extremely narrow three-dimensional adjustable concealed hinge according to claim 2, characterized in that: The rod portion of the third screw (8) is provided with an annular clamping groove (81), and the clamping groove (81) is clamped with the clamping hole (92).

4. The extremely narrow three-dimensional adjustable concealed hinge according to claim 1, characterized in that: The second screw (7) is a screw with a gasket, and the top surfaces at both ends of the second mounting seat (5) are concave to form a groove (53) for the gasket to slide up and down, and the adjustment hole (51) and the opening groove (52) are arranged in the middle of the groove (53).

5. The extremely narrow three-dimensional adjustable concealed hinge according to claim 4, characterized in that: An adjustment groove for inserting a screwdriver bit is concavely formed on the top surface of one or more of the first screw (6), the second screw (7) and the third screw (8).

6. The extremely narrow three-dimensional adjustable concealed hinge according to claim 2, characterized in that: The first mounting seat (4), the second mounting seat (5) and the connecting piece (9) are all made of wear-resistant plastic.

7. The extremely narrow three-dimensional adjustable concealed hinge according to claim 2, characterized in that: The second mounting seat (5) comprises a main body (54) and two ears (55) connected to both ends of the main body (54); the adjustment hole (51) and the opening groove (52) are both arranged on the ears (55); both ends of the inner cavity of the fixed page sheet (2) are provided with step portions (21); a first sliding groove (22) for the main body (54) to slide is formed between the two step portions (21); a second sliding groove (23) for the ears (55) to slide is formed above the step portions (21); and the connecting piece (9) is arranged in the second sliding groove (23).

8. The extremely narrow three-dimensional adjustable concealed hinge according to claim 1, characterized in that: The moving leaf piece (1) has a length of 75 to 85 mm, a width of 13 to 15 mm, and a thickness of 15 to 17 mm; The fixed page sheet (2) has a length of 75-85 mm, a width of 13-15 mm, and a thickness of 15-17 mm.

9. The extremely narrow three-dimensional adjustable concealed hinge according to claim 1, characterized in that: A third sliding groove (42) is provided in the first mounting seat (4), a fourth sliding groove (56) is provided in the second mounting seat (5), and two ends of the hinged member (3) are respectively slidably matched with the third sliding groove (42) and the fourth sliding groove (56).

10. The extremely narrow three-dimensional adjustable concealed hinge according to claim 9, characterized in that: The hinge (3) comprises a first crank arm (31), a second crank arm (32), a third crank arm (33), a first rotating shaft (34), a second rotating shaft (35), a third rotating shaft (36), a fourth rotating shaft (37) and a fifth rotating shaft (38); the first rotating shaft (34) and the second rotating shaft (35) are respectively arranged at two ends of the first crank arm (31); the first rotating shaft (34) and the third sliding groove (42) are slidably matched; the second rotating shaft (35) is rotatably arranged in the inner cavity of the fixed page sheet (2); the second crank arm (32) and the third crank arm (33) are located in the third sliding groove (42); On both sides of a crank arm (31), one end of the second crank arm (32) and the third crank arm (33) are connected to the third rotating shaft (36), and the other ends of the second crank arm (32) and the third crank arm (33) are connected to the fourth rotating shaft (37). The third rotating shaft (36) is rotatably arranged in the inner cavity of the movable leaf piece (1), and the fourth rotating shaft (37) is slidably matched with the fourth sliding groove (56). The middle part of the first crank arm (31), the middle part of the second crank arm (32) and the middle part of the third crank arm (33) are hinged through the fifth rotating shaft (38).

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