Hidden lower hinge for window

Abstract

The concealed lower hinge for the window comprises an opening and closing sliding assembly and a fixing assembly, the opening and closing sliding assembly is fixed to a window frame or / and a window sash through the fixing assembly, and the opening and closing sliding assembly comprises a lower hinge chain, a second lower hinge connecting plate, a first lower hinge connecting plate and a lower hinge bottom plate which are arranged from top to bottom; the lower hinge chain is rotationally connected with the second lower hinge connecting plate through a lower shaft, the lower hinge chain is rotationally connected with the first lower hinge connecting plate through a hinge sliding rivet, and the hinge sliding rivet slides in a sliding groove formed in the lower hinge chain; the fixing assembly comprises a lower hinge base, a first lower hinge connecting plate is riveted with a lower hinge bottom plate and movably connected with the lower hinge base below the lower hinge bottom plate, and a second lower hinge connecting plate is rotationally connected with the lower hinge bottom plate. The lower hinge base is embedded into a window frame below the lower hinge base to be fixed; and the lower hinge chain is fixed with the window sash. The problems that an existing hinge influences the inward tilting distance of a window sash and the risk that the bottom of the window sash makes contact with a window frame and collides with the window frame can be solved.

Description

Technical Field

[0001] This application relates to the field of building door and window hardware technology, and in particular to a concealed bottom hinge for windows. Background Technology

[0002] Unlike conventional casement windows, the inward-opening and tilt-and-turn windows in the current window and door industry can open inwards like ordinary inward-opening casement windows, and at the same time, by rotating the window handle, the window can be tilted inwards (that is, the lower part of the window remains stationary while the upper part tilts inwards). When tilted inwards, a gap can be opened, and the opened part is suspended in the air and connected and fixed to the window frame by hinges.

[0003] However, most current tilt-in hinges achieve tilt-in movement through the arc-shaped structure of the connecting part. While this enhances the stability of the product, it increases the rotation radius of the window sash. When tilting inward, the gap between the bottom of the window sash and the window frame is too small, affecting the tilt-in distance of the window sash and posing a risk of the bottom of the window sash contacting and bumping against the window frame.

[0004] Specifically, see Figure 1 This is a schematic diagram of an existing arc-shaped bowl structure that achieves inward tilting motion. The shaft 102 is riveted to the first connecting rod 101, and the inward tilting motion is achieved through the arc-shaped bowl structure 103. However, this structure has a large rotation radius R, which has several drawbacks. Figure 2 The inward tilt distance m of the window sash is shown, and there is a risk that the distance n between the bottom of the window sash and the window frame may be too small, leading to contact and collision. Utility Model Content

[0005] To at least partially solve the above problems, this application provides a concealed bottom hinge for windows, which can solve the problem that existing hinges affect the inward tilting distance of the window sash and pose a risk of the bottom of the window sash contacting and bumping against the window frame.

[0006] This utility model is achieved through the following technical solution:

[0007] A concealed lower hinge for windows is provided, comprising an opening and closing sliding component and a fixing component, wherein the opening and closing sliding component is fixed to the window frame and / or window sash by the fixing component.

[0008] The opening and closing sliding assembly includes a lower hinge chain, a second lower hinge connecting plate, a first lower hinge connecting plate, and a lower hinge base plate arranged from top to bottom. The lower hinge chain is rotatably connected to the second lower hinge connecting plate via a lower shaft. The lower hinge chain is rotatably connected to the first lower hinge connecting plate via a hinge sliding rivet, and the hinge sliding rivet slides within a groove opened on the lower hinge chain.

[0009] The fixed assembly comprises a lower hinge base, the lower hinge connecting plate one is riveted with the lower hinge bottom plate and movably connected with the lower hinge base below, the lower hinge connecting plate two and the lower hinge bottom plate are rotationally connected;

[0010] The lower hinge base is embedded into the window frame below and fixed; the lower hinge chain is fixed with the window sash.

[0011] Preferably, the lower hinge further comprises an adjusting assembly, the adjusting assembly comprises at least one of left-right adjusting assembly, up-down adjusting assembly, front-back adjusting assembly.

[0012] Preferably, the left-right adjusting assembly comprises a slant adjusting screw block provided on the lower hinge base in the left-right direction, the slant adjusting screw block is upwardly threaded out of the lower hinge bottom plate and threadedly connected with the inner hexagonal cylindrical head screw; the lower hinge bottom plate and the lower hinge base are fixed by at least two lower hinge rivets three, the hole on the lower hinge base for threading the lower hinge rivet three is a long hole in the left-right direction.

[0013] Preferably, the front-back adjusting assembly comprises a lower hinge eccentric adjusting rivet, the lower hinge connecting plate two and the lower hinge connecting plate one are rotationally connected by the lower hinge eccentric adjusting rivet.

[0014] Preferably, the up-down adjusting assembly comprises an inner sleeve, an inner hexagonal screw, the lower hinge chain comprises a vertical shaft sleeve, the lower shaft is sleeved into the lower part of the shaft sleeve, the inner hexagonal screw is threadedly connected with the upper part of the shaft sleeve, and the inner sleeve is arranged in the middle part of the shaft sleeve and abuts against the lower shaft and the inner hexagonal screw respectively.

[0015] Preferably, the lower hinge base is L-shaped, the L-shaped long side is laid in the slot at the bottom of the window frame, the L-shaped long side is fixed with the bottom of the window frame by the pointed inner hexagonal screw; the L-shaped short side leans on the side of the window frame, and the L-shaped short side is fixed with the side of the window frame by the lower hinge frame nut, the special-shaped screw.

[0016] Preferably, the lower hinge connecting plate one and the lower hinge bottom plate are riveted by the lower hinge rivet one, the bottom of the lower hinge rivet one is a spherical body, the spherical body is rotationally connected with the inner inverted embedding block arranged below the lower hinge bottom plate, and the lower hinge base is provided with a hole part for accommodating the inner inverted embedding block.

[0017] Preferably, the lower hinge connecting plate one and the lower hinge bottom plate are riveted by the lower hinge rivet one, and the lower hinge rivet one is fixed on the lower hinge bottom plate.

[0018] Preferably, the lower hinge rivet one is sleeved with a gasket, and the rotationally connecting part of the lower hinge connecting plate two and the lower hinge bottom plate is sleeved with a flexible gasket.

[0019] Preferably, the lower hinge connecting plate two and the lower hinge bottom plate are rotationally connected by the lower hinge rivet.

[0020] The hinge provided by the application has the following technical effects:

[0021] 1. The appearance is beautiful without external hinges.

[0022] 2. The inward opening operation is stable, the sash rotation radius is small, a greater inward opening distance can be obtained, the sash bottom is prevented from contacting and colliding with the window frame, the center of gravity is not biased, and the inward opening accommodation is accurate.

[0023] 3. The three-dimensional adjustment can be realized, and the inward opening and inward closing functions and the inward opening and inward closing function conversion can be realized by replacing a small number of accessories. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only belong to the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0025] Figure 1 : a hinge structure in the related art;

[0026] Figure 2 : a sash and window frame connection schematic view in the related art;

[0027] Figure 3 : a hinge structure exploded schematic view of the first embodiment of the present application;

[0028] Figure 4 : a hinge closed state schematic view of the first embodiment of the present application;

[0029] Figure 5 : a hinge open state schematic view of the first embodiment of the present application;

[0030] Figure 6 : a hinge flat opening state schematic view of the first embodiment of the present application;

[0031] Figure 7 : a hinge inward opening state schematic view of the first embodiment of the present application;

[0032] Figure 8 : a hinge and window frame installation schematic view of the first embodiment of the present application;

[0033] Figure 9 : a hinge adjustment schematic view of the first embodiment of the present application;

[0034] Figure 10 : a hinge lower hinge part structure schematic view of the second embodiment of the present application;

[0035] Figure 11 : it is structure and connection schematic view of rivet one place of lower hinge in embodiment one of the utility model;

[0036] Figure 12 : it is structure and connection schematic view of rivet two places of lower hinge in embodiment one of the utility model;

[0037] Figure 13 : it is connection structure schematic view of sash bottom in the utility model;

[0038] Figure 14 : it is cross section schematic view of sash bottom connection structure in the utility model.

[0039] Number:

[0040] 1-lower hinge base; 2-lower hinge screw nut two; 3-odd-shaped screw; 4-lower hinge rivet three; 5-internal hexagonal cylindrical head screw; 6-sharp head internal hexagonal screw; 7-inner inverted block; 8-lower hinge rivet one; 9-lower hinge bottom plate; 10-lower hinge rivet two; 11-lower hinge connecting plate one; 12-lower hinge connecting plate two; 13-lower hinge eccentric adjustment rivet; 14-lower shaft; 15-lower hinge chain; 16-inner sleeve; 17-internal hexagonal screw; 18-lower hinge screw nut screw; 19-lower hinge screw nut; 20-hinge sliding rivet; 21-gasket; 22-flexible gasket; 102-shaft; 101-first connecting rod; 103-circular arc bowl structure. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In order to solve the above technical problems, the hinge mechanism is optimized and improved in the present application, the window sash rotation radius is reduced when realizing the inner turning function, the window sash inner turning distance is increased, the risk of contact and collision between the window sash bottom and the window frame is avoided, and the product stability can be enhanced at the same time.

[0043] The technical scheme of the utility model will be further described in combination with the drawings and specific embodiments.

[0044] The present application provides a hardware system for optimizing design of 90° hidden inner opening and inner turning lower hinge for aluminum alloy window. Specifically, a hidden lower hinge for window is provided, referring to Figures 3-10, including an opening and closing sliding assembly and a fixed assembly, the opening and closing sliding assembly being fixed to a window frame or / and a window sash through the fixed assembly, wherein

[0045] The opening and closing sliding assembly comprises, from top to bottom, a lower hinge chain 15, a lower hinge connecting plate two 12, a lower hinge connecting plate one 11, and a lower hinge bottom plate 9. The lower hinge chain 15 is rotationally connected to the lower hinge connecting plate two 12 through a lower shaft 14. The lower hinge chain 15 is rotationally connected to the lower hinge connecting plate one 11 through a hinge sliding rivet 20, and the hinge sliding rivet 20 slides in a sliding groove formed in the lower hinge chain 15.

[0046] The fixed assembly comprises a lower hinge base 1. The lower hinge connecting plate one 11 is riveted to the lower hinge bottom plate 9 and movably connected to the lower hinge base 1 below. The lower hinge connecting plate two 12 is rotationally connected to the lower hinge bottom plate 9.

[0047] The lower hinge base 1 is embedded in the window frame below and fixed. The lower hinge chain 15 is fixed to the window sash.

[0048] In an embodiment of the present application, the lower hinge further comprises an adjusting assembly, as shown in Figure 9 The adjusting assembly comprises at least one of a left-right adjusting assembly, an up-down adjusting assembly, and a front-back adjusting assembly. Wherein, X represents the left-right direction, Y represents the front-back direction, and Z represents the up-down direction.

[0049] In an embodiment of the present application, as shown in Figure 3 , 5 , 9, the left-right adjusting assembly comprises a slanted adjusting screw block arranged on the lower hinge base 1 along the left-right direction. The slanted adjusting screw block is upwardly threaded through the lower hinge bottom plate 9 and threadedly connected to a hexagonal cylindrical head screw 5. The lower hinge bottom plate 9 and the lower hinge base 1 are fixed by at least two lower hinge rivets three 4. The holes on the lower hinge base 1 for threading the lower hinge rivets three 4 are long holes along the left-right direction. By rotating the hexagonal cylindrical head screw 5 on the lower hinge base, the lower hinge bottom plate 9 and the lower hinge base 1 are laterally displaced, which drives the window sash to move left and right, achieving the purpose of left-right adjustment.

[0050] In an embodiment of the present application, as shown in Figure 3 , 9 The front-back adjusting assembly comprises a lower hinge eccentric adjusting rivet 13. The lower hinge connecting plate two 12 and the lower hinge connecting plate one 11 are rotationally connected by the lower hinge eccentric adjusting rivet 13. By rotating the lower hinge eccentric adjusting rivet 13 on the lower hinge connecting plate 12, the lower hinge chain 15 and the lower hinge base 1 are displaced front and back, which drives the window sash to move front and back, achieving the purpose of compression adjustment.

[0051] In an embodiment of the present application, as shown in Figure 3 , 9The up-and-down adjusting assembly comprises an inner sleeve 16 and a hexagonal screw 17. The lower hinge chain 15 comprises a vertical sleeve, the lower shaft 14 is sleeved into the lower part of the sleeve, the hexagonal screw 17 is threadedly connected to the upper part of the sleeve, and the inner sleeve 16 is arranged in the middle part of the sleeve and abuts against the lower shaft 14 and the hexagonal screw 17. By rotating the hexagonal screw 17 on the lower hinge chain 15, the lower hinge chain 15 is vertically displaced relative to the lower hinge short connecting plate 12, the sash is moved up and down, and the up-and-down adjusting purpose is achieved.

[0052] In an embodiment of the present application, referring to Figure 3 , In an embodiment of the present application, referring to 8 , the lower hinge base 1 is L-shaped, the long side of the L is laid in the slot at the bottom of the window frame, and the long side is fixed to the bottom of the window frame by the pointed hexagonal screw 6; the short side of the L is arranged against the side of the window frame, and the short side is fixed to the side of the window frame by the hinge frame nut 2 and the special screw 3. In a specific embodiment, the hinge and the window frame are fixed by clamping and top screwing, the lower hinge base 1 is L-shaped, and the lower hinge base 1 is directly laid in the slot of the window frame, the short side of the L is in contact with the upper edge of the slot of the window frame, the long side of the L is a long circular hole and is connected to the lower hinge base plate 9 by the base plate rivet 4, the lower hinge base plate 9 is in contact with the upper edge of the slot of the window frame, and the two sides are in sufficient contact, thereby achieving installation and positioning. By rotating the hinge frame nut 2, the hinge frame nut 2 is in sufficient contact with the inner wall of the slot of the window frame, thereby achieving clamping. At the same time, the special screw 3 and the pointed hexagonal screw 6 are embedded in the inner wall of the wall thickness of the aluminum profile, thereby achieving locking. The installation and dismounting are simple and efficient, the efficiency of installation and dismounting of the hinge is improved, and the installation difficulty is reduced.

[0053] In an embodiment of the present application, referring to Figure 3 , the lower hinge connecting plate two 12 and the lower hinge base plate 9 are rotationally connected by the lower hinge rivet 10.

[0054] By the lower hinge rivet 10 and the hinge sliding rivet 20, stable movement is achieved. In combination with the lower hinge base plate 9 and the lower hinge chain 15, stable opening and closing on the interior casement window profile is achieved.

[0055] Embodiment one

[0056] In an embodiment of the present application, based on the foregoing structure, referring to Figures 3-9 , the lower hinge connecting plate one 11 and the lower hinge base plate 9 are riveted by the lower hinge rivet one 8, the bottom of the lower hinge rivet one 8 is a ball, and the ball is rotationally connected to the inner inverted embedding block 7 arranged below the lower hinge base plate 9; the lower hinge base 1 is provided with a hole portion accommodating the inner inverted embedding block 7. Specifically, the lower hinge rivet one 8 (ball rivet) is riveted and fixed to the lower hinge connecting plate one 9, and the ball structure of the lower hinge rivet one 8 is laid into the inner inverted embedding block 7 and can be rotated and inclined in the inner inverted embedding block 7, thereby achieving opening of the lower hinge and the inverted function.

[0057] Further, the ball structure of the lower hinge rivet one 8 can also be detached from the inner reverse block 7. Exemplarily, an outlet can be formed on one side of the inner reverse block 7, which has a neck portion and a body portion for passing the cylindrical portion and the ball portion of the lower hinge rivet one 8 respectively.

[0058] The hinge provided by the embodiment can realize the inner reverse and inner opening and closing functions.

[0059] Embodiment Two

[0060] On the basis of the above-mentioned embodiment one, referring to Figure 10 the structure and connection relationship of the lower hinge bottom plate 9 and the lower hinge rivet one 8 of embodiment one are adjusted, the inner reverse block 7 is not used, but the lower hinge connecting plate one 11 is riveted with the lower hinge bottom plate 9 through the lower hinge rivet one 8, and the lower hinge rivet one 8 is fixed on the lower hinge bottom plate 9.

[0061] Further, a gasket 21 is sleeved on the lower hinge rivet one 8, and a flexible gasket 22 is sleeved on the rotating connecting piece of the lower hinge connecting plate two 12 and the lower hinge bottom plate 9.

[0062] The hinge provided by the embodiment can realize the inner flat opening and closing functions.

[0063] On the basis of the above-mentioned basis structure, only by replacing the structure and connection relationship of the inner reverse block 7, the lower hinge bottom plate 9 and the lower hinge rivet one 8, the conversion of the inner reverse and inner opening hinge and the inner flat opening hinge can be realized, which is beneficial to the standardized production of parts and flexible assembly according to the functional needs.

[0064] The hinge provided by the application can realize the bearing of the weight of the window sash and the opening, closing and inner reverse movement of the window sash after being installed on the inner opening and inner reverse or inner flat opening window profile, realizes more convenient installation and adjustment, three-dimensional adjustment, and conversion of the inner opening and inner reverse function and the inner flat opening function through replacement of a small amount of accessories.

[0065] When the flat opening function is realized, the structures of embodiments one and two can be used. Referring to Figure 4 , the lower hinge base 1 and the lower hinge chain 15 are in a parallel state in the closed state of the hinge, in the opening process, referring to Figure 5 , with the opening of the window sash, the lower hinge chain 15 is driven to move, and the lower hinge connecting plate one 11 and the lower hinge connecting plate two 12 cooperate to operate, the included angle between the lower hinge base 1 and the lower hinge chain 15 becomes larger, the hinge sliding rivet 20 gradually approaches the edge of the sliding groove of the lower hinge chain 15, until the hinge is opened to the maximum angle position, at this time, the hinge sliding rivet 20 is slid to contact the edge of the sliding groove of the lower hinge chain 15, limiting the maximum opening angle of the hinge. Referring to Figure 6, the vertical center line of the lower hinge rivet one 8 is perpendicular to the lower hinge bottom plate 9 in the inner reverse embedding block 7, and the vertical center line of the lower hinge rivet two 10 is also perpendicular to the lower hinge bottom plate 9.

[0066] In the implementation of the inner opening and inner reverse function, the structure of the first embodiment is used in cooperation with the inner opening and inner reverse upper hinge. When the window is in the inner reverse state, referring to Figure 7 , the vertical center line of the lower hinge rivet one 8 is at a certain angle with the lower hinge bottom plate 9 in the inner reverse embedding block 7, and the lower hinge rivet two 10 is at a certain angle with the lower hinge bottom plate 9, which plays a role in reverse accommodation to meet the inner reverse state of the window. Referring to Figure 6 , when the window is in the closed state, the vertical center line of the lower hinge rivet one 8 is perpendicular to the lower hinge bottom plate 9 in the inner reverse embedding block 7, and the vertical center line of the lower hinge rivet two 10 is also perpendicular to the lower hinge bottom plate 9.

[0067] Further referring to Figure 11 , unlike the scheme in the background art, the bottom of the lower hinge rivet one 8 of the first embodiment of the application adopts a spherical structure, which contacts the lower hinge base 1 and can rotate in the inner reverse embedding block 7. The inner reverse embedding block 7 is fixed by riveting between the lower hinge base 1 and the lower hinge bottom plate 9, so that it is embedded between the lower hinge base 1 and the lower hinge bottom plate 9. The rotation radius R is small, so that the lower hinge rivet one 8 will not come out when rotating and the product stability is enhanced. Referring to Figure 12 , the lower hinge rivet two 10 functions to connect the lower hinge short connecting plate 12 to drive the lower hinge chain 15 to rotate along the lower shaft 14. When the upper suspension, the lower hinge rivet two 10 is at a certain angle with the lower hinge bottom plate 9, which plays a role in upper suspension accommodation, and at the same time plays a role in linkage when the window is in the flat opening state.

[0068] Further referring to Figure 13 , Figure 14 , the lower hinge screw nut 18 penetrates through the lower hinge chain 15 and is rotationally connected with the lower hinge screw nut 19. The lower hinge screw nut 19 is located in the groove of the lower hinge chain 15. In the initial state, the length direction of the lower hinge screw nut is parallel to the lower hinge chain 15. When the lower hinge screw nut screw 18 is rotated, the lower hinge screw nut can be rotated. When it is rotated by 90°, the groove part of the lower hinge chain 15 can play a limiting role. At this time, the lower hinge screw nut can be firmly clamped in the window sash profile slot, which plays a role in connecting and positioning the lower hinge and the window sash.

[0069] The above is only an embodiment of the application and is not used to limit the application. The application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the scope of the claims of the application.

Claims

1. A concealed bottom hinge for a window, characterized in that, The application relates to a window hinge, which comprises an opening and closing sliding assembly and a fixing assembly, wherein the opening and closing sliding assembly is fixed to a window frame or / and a window sash through the fixing assembly. The opening and closing sliding assembly comprises a lower hinge chain (15), a lower hinge connecting plate two (12), a lower hinge connecting plate one (11) and a lower hinge bottom plate (9) arranged from top to bottom, the lower hinge chain (15) is rotationally connected with the lower hinge connecting plate two (12) through a lower shaft (14), the lower hinge chain (15) is rotationally connected with the lower hinge connecting plate one (11) through a hinge sliding rivet (20), and the hinge sliding rivet (20) slides in a sliding groove formed in the lower hinge chain (15). The fixing assembly comprises a lower hinge base (1), the lower hinge connecting plate one (11) is riveted with the lower hinge bottom plate (9) and movably connected with the lower hinge base (1) below the lower hinge bottom plate (9), and the lower hinge connecting plate two (12) is rotationally connected with the lower hinge bottom plate (9). The lower hinge base (1) is embedded in the window frame below and fixed, and the lower hinge chain (15) is fixed to the window sash.

2. A concealed bottom hinge for windows as claimed in claim 1, characterized in that, The lower hinge further comprises an adjusting assembly, and the adjusting assembly comprises at least one of a left-right adjusting assembly, an up-down adjusting assembly and a front-rear adjusting assembly.

3. A concealed bottom hinge for windows as claimed in claim 2, characterized in that, The left-right adjusting assembly comprises a left-right inclined adjusting screw block arranged on the lower hinge base (1), the inclined adjusting screw block is upwardly penetrated through the lower hinge bottom plate (9) and then threadedly connected with an inner hexagonal cylindrical head screw (5), the lower hinge bottom plate (9) and the lower hinge base (1) are fixed through at least two lower hinge rivets three (4), and the holes for penetrating the lower hinge rivets three (4) on the lower hinge base (1) are long holes in the left-right direction.

4. A concealed bottom hinge for windows as claimed in claim 2, characterized in that, The front-rear adjusting assembly comprises a lower hinge eccentric adjusting rivet (13), and the lower hinge connecting plate two (12) is rotationally connected with the lower hinge connecting plate one (11) through the lower hinge eccentric adjusting rivet (13).

5. A concealed bottom hinge for windows as claimed in claim 2, characterized in that, The up-down adjusting assembly comprises an inner sleeve (16) and an inner hexagonal screw (17), the lower hinge chain (15) comprises a vertical shaft sleeve, the lower shaft (14) is sleeved into the lower part of the shaft sleeve, the inner hexagonal screw (17) is threadedly connected with the upper part of the shaft sleeve, and the inner sleeve (16) is arranged in the middle part of the shaft sleeve and abuts against the lower shaft (14) and the inner hexagonal screw (17) respectively.

6. A concealed bottom hinge for windows as claimed in claim 1, characterized in that, The lower hinge base (1) is L-shaped, the long side of the L-shaped base is laid in a slot at the bottom of the window frame and fixed to the bottom of the window frame through a pointed inner hexagonal screw (6), and the short side of the L-shaped base leans against the side of the window frame and fixed to the side of the window frame through a lower hinge frame nut (2) and a special screw (3).

7. A concealed bottom hinge for windows as claimed in claim 1, characterized in that, The lower hinge connecting plate one (11) is riveted with the lower hinge bottom plate (9) through a lower hinge rivet one (8), the bottom of the lower hinge rivet one (8) is a spherical body, the spherical body is rotationally connected with an inner inverted embedding block (7) arranged below the lower hinge bottom plate (9), and the lower hinge base (1) is provided with a hole part for accommodating the inner inverted embedding block (7).

8. A concealed bottom hinge for windows as claimed in claim 1, characterized in that, The lower hinge connecting plate one (11) is riveted with the lower hinge bottom plate (9) through the lower hinge rivet one (8), and the lower hinge rivet one (8) is fixed to the lower hinge bottom plate (9).

9. A concealed bottom hinge for windows as claimed in claim 8, characterized in that, The lower hinge rivet one (8) is sleeved with a gasket (21), and the rotation connecting piece of the lower hinge connecting plate two (12) and the lower hinge bottom plate (9) is sleeved with a flexible gasket (22).

10. A concealed bottom hinge for windows as claimed in claim 1, characterized in that, The lower hinge connecting plate two (12) and the lower hinge bottom plate (9) are rotationally connected through the lower hinge rivet (10).

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