A swing arm type mortise and tenon joint

Abstract

This utility model discloses a hinged structure with a rotating arm, which is mainly composed of a door leaf fixing component assembly, a rotating arm assembly, a door frame fixing seat, and a shaft A. The door leaf fixing component assembly includes a door leaf hinge, a shaft B, a bushing, a flat-head screw A, a T-shaped adjusting foot, a flat support A, and a positioning device A. The mounting plate of the door leaf hinge is provided with at least a screw hole A and a mounting hole A for installing the T-shaped adjusting foot. Adjusting the T-shaped adjusting foot can easily adjust the relative gap between the door leaf and the door frame. The rotating arm assembly includes a rotating arm A, a positioning device B, a countersunk screw A or a flat-head screw A. The positioning device B includes a tubular device body, a compression spring B, and a steel ball A. The rotating arm A is connected and fixed to the rotating arm B (23) through the connecting part A and the connecting part B of the rotating arm A (23) with a countersunk screw A to form a space A for concealing the door leaf cover sealing strip and a space B for the door frame clearance.

Description

Technical Field

[0001] This utility model relates to a swivel-arm concealed hinge structure, which belongs to the category of hardware products. Background Technology

[0002] Hinges are a crucial component of door products. Existing security doors use ordinary swivel hinges, where the pivot is concealed within the door frame. The door panel mounting base and swivel arm are fixed together with multiple screws, making disassembly and installation difficult. Furthermore, the market demand for high-end security doors has led to an increasing adoption of concealed hinges. Concealed swivel hinges are generally single-axis hinges with the pivot inside the door frame, commonly referred to as concealed swivel hinges. These hinges are welded to the door frame via a hinge box. Door installation and adjustment are cumbersome, and the opening angle is limited, typically reaching only about 120 degrees. Therefore, developing a swivel hinge that is easy to assemble, adjust, and install, allows for smooth and flexible opening, and enables a 180-degree opening angle is becoming increasingly important. Summary of the Invention

[0003] Based on the aforementioned product defects and requirements, the technical problem to be solved by this utility model is to provide a swivel-arm concealed hinge structure that enables the door leaf to open at an angle of 180 degrees.

[0004] The following is the technical solution (one) adopted by this utility model:

[0005] A concealed hinge structure with a swivel arm mainly consists of a door leaf fixing component assembly, a swivel arm assembly, a door frame fixing seat, and shaft A. The door leaf fixing component assembly includes a door leaf hinge, shaft B, a bushing or flat washer, a flat-head screw A, a T-shaped adjusting leg, a flat support A, and a positioning device A. The mounting plate of the door leaf hinge is provided with at least screw holes A and mounting holes A for installing the T-shaped adjusting leg. Adjusting the T-shaped adjusting leg allows for convenient adjustment of the relative gap between the door leaf and the door frame. A protruding boss perpendicular to and intersecting the center line of the fixed shaft hole A is provided on the outer side of the fixed shaft hole A, and a threaded hole B is provided. The threaded hole B penetrates and connects to the hole wall of the fixed shaft hole A. The positioning device A is installed on the outer side in cooperation with the threaded hole B. The positioning device A includes an external threaded device body, a compression spring A, and a steel ball B. The positioning device A initially restricts the relative rotation of the door leaf and the rotating arm assembly when the door leaf is opened. The bushing or flat washer is provided at both outer ends of the door leaf hinge and is movably engaged with the shaft B. The shaft B has threaded holes B at both ends. The flat-head screw A matches the threaded holes B to install and fix the shaft B, or the shaft B has no threaded holes B at both ends, but has a flat-head screw A and a bushing or flat washer. The door leaf fixing component assembly is connected to the fixed shaft hole B end of the rotating arm assembly through the shaft B. The flat support component A The shaft B is installed at the inner end of the two fixed shaft holes A of the door hinge and abuts against the fixed shaft hole B of the swivel arm assembly; the shaft B is movably connected to the door fixing component assembly, and the shaft B is fixedly connected to the fixed shaft hole B of the swivel arm assembly; the shaft B is provided with a circumferential positioning groove or fixed hole at the position corresponding to the positioning device A, and the circumferential positioning groove or fixed hole is provided with an R-shaped convex surface to make the door opening smooth and stable, and the positioning device A controls and limits the relative rotation of the door fixing component assembly and the swivel arm assembly; the shaft hole C of the swivel arm assembly is movably connected to the shaft hole D of the door frame fixing seat through the shaft A, and the flat support B is provided on the inner side of the shaft hole D of the door frame fixing seat and abuts against the shaft hole C of the swivel arm assembly; the shaft A is fixedly connected to the outer side of the shaft hole D of the door frame fixing seat by welding or riveting.

[0006] The rotating arm assembly includes a rotating arm A, a positioning device B, and a countersunk screw A or a flat-head screw A; the rotating arm A includes a fixing part shaft hole C, a connecting part A, and a connecting section A connecting the fixing part shaft hole C and the connecting part A; the positioning device B is located inside or outside the connecting section A, and is welded, riveted, or integrally designed with the connecting section A; the positioning device B includes a tubular device body, a compression spring B, and a steel ball A; the rotating arm B includes a fixing shaft hole B, a connecting part B, and a connecting section B connecting the fixing shaft hole B and the connecting part B. The connecting part B has at least one open insertion groove with a countersunk hole that matches the countersunk screw A, and several circular countersunk mounting holes B / several open insertion grooves with countersunk holes or circular countersunk mounting holes B; the rotating arm A is connected and fixed to the connecting part B of the rotating arm B through the connecting part A and the connecting part B of the rotating arm B with countersunk screw A, forming a space A for concealing the door leaf edge sealing strip and a door frame clearance space B. The door leaf edge sealing strip space A allows the edge sealing strip to remain unbroken when the door leaf is opened to the first state, improving the airtightness and sound insulation of the frame-sash joint. The door frame clearance space B, combined with the shaft B, allows the door leaf to be opened to the second state position.

[0007] The connecting part of the rotating arm A and the rotating arm B is designed as at least one open insertion groove with countersunk hole that matches the countersunk screw A and several round countersunk mounting holes B / several open insertion grooves with countersunk hole or round countersunk mounting holes B, and the connecting part of the rotating arm B is designed as several screw holes.

[0008] The door frame fixing seat is an ear-type door frame fixing seat a. The ear-type door frame fixing seat a is symmetrically designed with mounting feet, ear-type legs, and ear-type leg bearing surfaces. The ear-type leg bearing surfaces include at least a shaft hole D, an arc-shaped guide groove, and a positioning hole. The mounting feet are provided with at least a longitudinal or transverse countersunk mounting hole A.

[0009] The planar support A and planar support B are planar bearing structures or planar shims, such as bushings with planar shims, two planar shims with a copper washer or planar shim sandwiched in between, or steel ball planar bearings.

[0010] The door frame fixing seat includes at least a shaft hole D, an arc-shaped guide groove, a positioning hole support surface, and a mounting foot, with a mounting hole C on the mounting foot.

[0011] Furthermore: the door frame fixing seat is designed with an angle limiting stop strip; the mounting foot is provided with mounting holes C, which are circular or oval mounting holes, and the oval mounting holes are designed with a longitudinal or transverse layout.

[0012] Technical Solution (II):

[0013] A concealed hinge structure with a rotating arm further comprises a door leaf fixing component a, a rotating arm assembly, a door frame fixing seat, and a shaft A. The door leaf fixing component a comprises a door leaf hinge a, a shaft Ba, a bushing or flat washer, a flat-head screw A, an adjusting screw, a connecting plate, a flat support A, a positioning device A, a screw hole plate, a mounting plate, a countersunk screw B, a guide sleeve, and a set of flat-head screws B. The mounting plate of the door leaf hinge a is provided with at least a plurality of open mounting holes D and closed mounting holes E for mounting and fixing the flat-head screws B. A set of closed mounting holes E or a set of open mounting holes D are connected to a screw hole plate with a flat-head screw B to fix the door hinge a. The flat-head screw B passes through the fixing hole, guide sleeve, screw hole plate and connecting hole on the mounting plate in sequence to fix the mounting plate. The screw hole plate can be adjusted in position with the mounting plate by adjusting the screw. On the outside of the fixing shaft hole A, there is an outward protrusion perpendicular to and intersecting the center line of the fixing shaft hole A, and a threaded hole B. The threaded hole B passes through the hole wall of the fixing shaft hole A. The positioning device A is connected to the threaded hole B. The positioning device A, installed on the outside, includes an external threaded device body, a compression spring A, and a steel ball B; the bushing or flat washer is located at both outer ends of the door hinge shaft hole and movably engages with the shaft B; the shaft B has threaded holes B at both ends, and a flat-head screw A matches the threaded holes B to install and fix the shaft B, or the shaft B has no threaded holes B at both ends, a flat-head screw A, and a bushing or flat washer; the door fixing component assembly is connected to the rotating arm assembly through the connecting fixed shaft hole B end of the shaft B, and the flat support A is located at the inner end of the two connecting fixed shaft holes A of the door hinge and connects to the rotating arm assembly. The shaft B is fixedly installed at the end of the fixed shaft hole B, and the shaft B is fixedly connected to the fixed shaft hole B of the rotating arm assembly. The shaft B is provided with a circumferential positioning groove or fixed hole at the position corresponding to the positioning device A. The positioning device A controls and limits the relative rotation of the door leaf fixing component assembly and the rotating arm assembly. The shaft hole C end of the rotating arm assembly is movably connected to the shaft hole D of the door frame fixing seat through the shaft A. The planar support B is located on the inner side of the shaft hole D of the door frame fixing seat and is installed at the end of the shaft hole C of the rotating arm assembly. The shaft A is fixedly connected to the outer side of the shaft hole D of the door frame fixing seat by welding or riveting.

[0014] Furthermore: the door hinge a includes a door hinge b, the door hinge b includes a double-sided or single-sided grid mounting surface, several square mounting holes G and open square mounting holes H; the mounting plate is provided with at least several mounting holes F and fixing holes.

[0015] In addition, the rotating arms A and B in the above technical solutions can be designed as integral folded or cast-formed rotating arms C according to the structural requirements of the door leaf and door frame, especially the shape design of rotating arm A. The rotating arm C or rotating arm A is provided with a fixed part shaft hole C, a connecting part including a fixed part shaft hole C, a connecting part A, and a connecting section A connecting the fixed part shaft hole C and the connecting part A. The connecting section A includes at least the following structural designs: fixed part shaft hole C, extended edge of fixed part shaft hole C, outer bend angle A, vertical edge, outer bend angle B, arc-shaped surface, inner bend angle, and straight edge A; or fixed part shaft hole C, extended edge of fixed part shaft hole C, outer bend angle A, vertical edge, outer bend angle B, inclined edge A, outer bend angle C, straight edge B, outer bend angle D, inclined edge B, inner bend angle, and straight edge A; or fixed part shaft hole C, extended edge of fixed part shaft hole C, outer bend angle A, vertical edge, R-arc angle, straight edge B, outer bend angle D, inclined edge B, inner bend angle, and straight edge A.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] Firstly, the concealed hinge of this utility model allows for easy adjustment of the relative gap between the door leaf and the door frame by adjusting the T-shaped adjusting foot or adjusting screw; combined with the square mounting hole G and open square mounting hole H of the door leaf hinge b structure, the concealed hinge can achieve three-dimensional adjustable function.

[0018] Secondly, in the concealed hinge of this utility model, if the swing arm component is designed as a U-shaped double-axis hole swing arm structure, its U-shaped recessed space can conceal the door leaf edge sealing strip and make room for the door frame, ensuring the door leaf sealing strip remains intact. This improves the airtightness and sound insulation of the frame-sash joint, and allows for a wider door opening angle.

[0019] Thirdly, the concealed hinge of this utility model has a dual-axis structure of axis A and axis B. First, the door leaf is opened to the normal opening angle through axis A or axis B. Then, the opening angle is increased again through axis B or axis A. Therefore, the door leaf is always opened by a single axis. The hinge has advantages such as strong load-bearing capacity, no abnormal noise caused by the simultaneous rotation of multiple axes, long service life, and opening angle of more than 175 degrees.

[0020] Fourth, the concealed hinge of this utility model comprises a hinge assembly A and a hinge assembly B. Hinge assembly A is connected to the door frame, and hinge assembly B is connected to the door leaf. Hinge assembly A connects to hinge assembly B via an outwardly extending connecting part A, allowing for quick installation of the door leaf and door frame. The structure employs a countersunk screw A with a countersunk opening groove and a matching circular countersunk mounting hole B, resulting in stronger connection strength compared to flat-head screws. This structural design is reasonable, simple, and easy to disassemble and install. Attached Figure Description

[0021] Figure 1This is a three-dimensional structural illustration of the concealed hinge of this utility model.

[0022] Figure 2 This is an exploded three-dimensional diagram illustrating the concealed hinge of this utility model (I).

[0023] Figure 3 This is a three-dimensional illustration of the door hinge structure of the concealed hinge of this utility model.

[0024] Figure 4 A three-dimensional illustration of the structural features of shafts B and Ba.

[0025] Figure 5 A three-dimensional illustration of the structural features of the door frame fixing seat.

[0026] Figure 6 A three-dimensional illustration of the structural features of the swing arm assembly.

[0027] Figure 7 A three-dimensional exploded view illustrating the structural features of the swing arm assembly (I).

[0028] Figure 8 Three-dimensional exploded diagram illustrating the structural features of the swing arm assembly (II).

[0029] Figure 9 An exploded three-dimensional diagram illustrating the structural features of door leaf fastener assembly a.

[0030] Figure 10 This is a three-dimensional exploded view (II) illustrating the concealed hinge of this utility model.

[0031] Figure 11 This is an illustration of the cross-sectional structural features of the concealed hinge of this utility model.

[0032] Figure 12 This is a diagram illustrating the structural features of door hinge b (11b).

[0033] Figure 13 Explanation of the structural features of the ear-type door frame fixing seat a (3a).

[0034] Figure 14 This is a diagram illustrating the structural features of the C-arm, which is a folded or cast integral structure.

[0035] Figure 15 Figure 1 illustrates the structural features of the rotating arm A.

[0036] Figure 16 Figure 2 illustrates the structural features of the rotating arm A.

[0037] Figure 17 Figure 3 illustrates the structural features of the rotating arm A.

[0038] Figure 18This diagram shows the door in its first open position, with concealed hinges installed on the door frame and door leaf.

[0039] Figure 19 This diagram illustrates the second open position of the door leaf when the concealed hinges are installed on the door frame and door leaf. Detailed Implementation

[0040] See attached document Figures 1-19 The present invention will be further described in conjunction with the embodiments:

[0041] A concealed hinge structure with a swivel arm mainly consists of a door leaf fixing component 1, a swivel arm assembly 2, a door frame fixing seat 3, and a shaft A4. The door leaf fixing component 1 includes a door leaf hinge 11, a shaft B12, a bushing or flat washer 13, a flat-head screw A14, a T-shaped adjusting leg 15, a flat support A16, and a positioning device A17. The mounting plate 111 of the door leaf hinge 11 is provided with at least screw holes A112 and mounting holes A113 for mounting the T-shaped adjusting leg 15. Adjusting the T-shaped adjusting leg 15 can easily adjust the relative gap between the door leaf and the door frame. An outwardly protruding boss 114 perpendicular to and intersecting the center line of the fixed shaft hole A117 is provided on the outer side of the connecting fixed shaft hole A117, and a threaded hole B115 is provided. The threaded hole B115 penetrates the hole wall of the fixed shaft hole A117. The positioning device A17 is installed on the outer side in cooperation with the threaded hole B115. The positioning device A17 includes an external threaded device body 171, a compression spring A172, and a steel ball B173. The positioning device A17 initially restricts the relative rotation of the rotating arm assembly 2 when the door leaf is opened. The bushing or flat washer 13 is provided at both outer ends of the door leaf hinge 11 and is movablely engaged with the shaft B12. The shaft B12 has threaded holes B122 at both ends. The flat-head screw A14 matches the threaded holes B122 to install and fix the shaft B12, or the shaft B12 has no threaded holes B122 at both ends, and has the flat-head screw A14 and bushing or flat washer 13. The door leaf fixing component 1 is connected to the connecting fixed shaft hole B231 end of the rotating arm assembly 2 through the shaft B12. The planar support A16 is installed inside the two fixed shaft holes A117 of the door hinge 11, and abuts against the end of the connecting fixed shaft hole B231 of the swing arm assembly 2; the shaft B12 is movably connected to the door fixing component assembly 1, and the shaft B12 is fixedly connected to the end of the connecting fixed shaft hole B231 of the swing arm assembly 2; the shaft B12 is provided with a circumferential positioning groove or fixed hole 121 corresponding to the position of the positioning device A17, and the circumferential positioning groove or fixed hole 121 is provided with an R-shaped convex surface 123 to allow The door opens smoothly and moves stably. The positioning device A17 controls and limits the relative rotation of the door fixing component 1 and the rotating arm component 2. The shaft hole C211 end of the rotating arm component 2 is movably connected to the shaft hole D31 of the door frame fixing seat 3 through the shaft A4. The flat support B5 is located on the inner side of the shaft hole D31 of the door frame fixing seat 3 and abuts against the shaft hole C211 end of the rotating arm component 2. The shaft A4 is welded or riveted to the outer side of the shaft hole D31 of the door frame fixing seat 3 for a fixed connection.

[0042] The rotating arm assembly 2 includes a rotating arm A21, a positioning device B22, a rotating arm B23, and a countersunk screw A24 or a flathead screw A; the rotating arm A21 includes a fixing part shaft hole C211, a connecting part A213, and a connecting section A214 connecting the fixing part shaft hole C211 and the connecting part A213; the positioning device B22 is located inside or outside the connecting section A214, and is welded, riveted, or integrally designed with the connecting section A214; the positioning device B22 includes a tubular device body 27, a compression spring B28, and a steel ball A29; the rotating arm B23 includes a fixing shaft hole B231, a connecting part A214, a positioning device B22, a positioning device B23, a positioning device B24, a positioning device B22, a positioning device B23, a positioning device B24, a positioning device B25, a positioning device B26, a positioning device B27, a positioning device B28, and a positioning device B29; the rotating arm B23 includes a fixing shaft hole B231, a positioning device B22, a positioning device B23, a positioning device B24, a positioning device B25, a positioning device B26, a positioning device B27, a positioning device B28, a positioning device B29, a positioning device B23, a positioning device B24, a positioning device B25, a positioning device B26, a positioning device B27, a positioning device B27, a positioning device B28, and a positioning device B29; the rotating arm B23 includes a fixing shaft hole B231, a positioning device B22, a positioning device B23, a positioning device B24, a positioning device B25, a positioning device B26, a positioning device B27, a positioning device B27, a positioning device B28, and a positioning device B29; the rotating arm B23 includes a fixing shaft hole B231, a positioning device B26, a positioning device B27, a positioning The connecting part B232 and the connecting section B235 connecting the fixed shaft hole B231 and the connecting part B232 are provided. The connecting part B232 has at least one open insertion groove 233 with countersunk hole matching the countersunk screw A24 and several round countersunk mounting holes B234 / several open insertion grooves 233 with countersunk hole or round countersunk mounting holes B234. The rotating arm A21 is connected and fixed to the connecting part B232 of the rotating arm B23 through the connecting part A213 with the connecting part B232 of the rotating arm B23 by the countersunk screw A24 to form the space A26 for hiding the door leaf cover sealing strip and the door frame clearance space B25.

[0043] The connecting part of the rotating arm A21 is designed as at least one open insertion groove 233 with countersunk hole matching the countersunk screw A24 and several round countersunk mounting holes B234 / several open insertion grooves 233 with countersunk hole or round countersunk mounting holes B234. The connecting part of the rotating arm B23 is designed as several screw holes.

[0044] The door frame fixing seat 3 is an ear-type door frame fixing seat a3a. The ear-type door frame fixing seat a3a is symmetrically designed with mounting foot plate 36a, ear-type support foot 37a, and ear-type support foot bearing surface 37a-1. The ear-type support foot bearing surface 37a-1 includes at least a shaft hole D31, an arc-shaped guide groove 32, and a positioning hole 33. The mounting foot plate 36a is provided with at least a longitudinal or transverse oval countersunk mounting hole A35a.

[0045] The planar support A16 and planar support B5 are planar bearing structures consisting of a bushing or a planar shim with two planar shims or two planar shims with a copper washer sandwiched in between, or planar bearing structures consisting of steel balls or planar shims.

[0046] The door frame fixing seat 3 includes at least a shaft hole D31, an arc-shaped guide groove 32, a positioning hole 33, a support surface 34, and a mounting foot 36, with a mounting hole C35 on the mounting foot 36.

[0047] Preferably, the door frame fixing seat 3 is designed with an angle limiting stop strip 37; the mounting foot 36 is provided with a mounting hole C35, which is a circular or oval mounting hole, and the oval mounting hole is designed with a longitudinal or transverse layout.

[0048] Technical Solution (II):

[0049] A concealed hinge structure with a rotating arm further comprises a door leaf fixing component assembly a1a, a rotating arm assembly 2, a door frame fixing seat 3, and a shaft A4. The door leaf fixing component assembly a1a includes a door leaf hinge a11a, a shaft Ba12a, a bushing or flat washer 13, a flat-head screw A14, an adjusting screw 15a, a connecting plate 16a, a flat support A16, a positioning device A17, a screw hole plate 17a, a mounting plate 18a, a countersunk screw B19a, a guide sleeve 20a, and a flat-head screw B21a. The mounting plate 111a of the door leaf hinge a11a has at least a combination of several open mounting holes D11a-2 and closed mounting holes E11a-1, or a set of closed mounting holes E11a-1 or a set of open mounting holes D11a-2, for mounting and fixing the flat-head screw B21a. The screw hole 17a-1 on the screw hole plate 17a is used to fix the door hinge a11a; the flat head screw B21a passes through the fixing hole 18a-2 on the mounting fixing plate 18a, the guide sleeve 20a, the screw hole plate 17a and the screw hole 16a-1 on the connecting plate 16a to fix the mounting fixing plate 18a. The screw hole plate 17a can be adjusted in position with the mounting fixing plate 18a by adjusting the screw 15a; on the outside of the fixing shaft hole A117, there is an outward protrusion 114 perpendicular to and intersecting the center line of the fixing shaft hole A117 and a threaded hole B115. The threaded hole B115 passes through and connects to the hole wall of the fixing shaft hole B115. The positioning device A17 is installed on the outside in cooperation with the threaded hole B115. On the side, the positioning device A17 includes an external threaded device body 171, a compression spring A172, and a steel ball B173; the bushing or flat washer 13 is tightly fitted with the fixing shaft holes A117 at both ends of the door hinge 11; the shaft B12 has screw holes B122 at both ends, and the flat-head screw A14 matches the screw holes B122 to install and fix the shaft B12, or the shaft B12 has no screw holes B122 at both ends, and the flat-head screw A14 and the bushing or flat washer 13 are installed; the door fixing component 1 is connected to the connecting fixing shaft hole B231 of the rotating arm component 2 through the shaft B12, and the flat support A16 is located inside the two fixing shaft holes A117 of the door hinge 11 and connected to the connecting fixing shaft hole B231 of the rotating arm component 2. The ends are installed abutting each other; shaft B12 is movably connected to door leaf fixing component 1, and shaft B12 is fixedly connected to the connecting fixing shaft hole B231 end of the rotating arm component 2; the shaft B12 is provided with a circumferential positioning groove or fixed hole 121 at the position corresponding to the positioning device A17, and the relative rotation of door leaf fixing component 1 and rotating arm component 2 is controlled and limited by the positioning device A17; the shaft hole C211 end of the rotating arm component 2 is movably connected to the shaft hole D31 of the door frame fixing seat 3 through shaft A4, and the flat support B5 is provided on the inner side of the shaft hole D31 of the door frame fixing seat 3 and abutting the shaft hole C211 end of the rotating arm component (2); shaft A4 is welded or riveted to the outer side of the shaft hole D31 of the door frame fixing seat 3.

[0050] Preferably, the door hinge a11a includes a door hinge b11b, the door hinge b11b includes a double-sided or single-sided grid 113b mounting surface 111b, a plurality of square mounting holes G11b-1 and open square mounting holes H11b-2; the mounting plate 18a is provided with at least a plurality of mounting holes F18a-1 and fixing holes 18a-2.

[0051] Furthermore, the rotating arms A21 and B23 in the above technical solutions can be designed as integrally folded or cast-formed rotating arms C2c according to the structural requirements of the door leaf and door frame, especially the shape design of rotating arm A21. The rotating arm C2c or rotating arm A21 is provided with a fixing part shaft hole C211, a connecting part including a fixing part shaft hole C211, a connecting part A213, and a connecting section A214 connecting the fixing part shaft hole C211 and the connecting part A213. The connecting section A214 at least includes the fixing part shaft hole C211, an extension edge 215 of the fixing part shaft hole C211, an outer bending angle A216, a vertical edge 217, an outer bending angle B218, an arc-shaped surface 219, an inner bending angle 220, and a straight edge A221 or the fixing part shaft hole C211 and the fixing part shaft hole C21. 1. Structural designs including: extension edge 215, outer bend angle A216, vertical edge 217, outer bend angle B218, hypotenuse A222, outer bend angle C223, straight edge B224, outer bend angle D225, hypotenuse B226, inner bend angle 220, and straight edge A221, or fixed part shaft hole C211, fixed part shaft hole C211, extension edge 215, outer bend angle A216, vertical edge 217, R-curved angle 227, straight edge B224, outer bend angle D225, hypotenuse B226, inner bend angle 220, and straight edge A221.

[0052] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of this utility model. Obviously, it is not limited to the above embodiments, and many variations are possible. All structural, principle, and shape variations (specifically referring to the shape and structure of the swing arm) that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A concealed hinge structure with a rotating arm, mainly composed of a door leaf fixing component assembly (1), a rotating arm assembly (2), a door frame fixing seat (3), and a shaft A (4), characterized in that: The door leaf fixing assembly (1) includes a door leaf hinge (11), shaft B (12), bushing or flat washer (13), flat head screw A (14), T-shaped adjusting leg (15), flat support A (16), and positioning device A (17). The mounting plate (111) of the door leaf hinge (11) is provided with at least a screw hole A (112) and a mounting hole A (113) for mounting the T-shaped adjusting leg (15). On the outside of the fixed shaft hole A (117), there is an outward boss (114) perpendicular to and intersecting with the center line of the fixed shaft hole A (117) and a threaded hole B (115). The threaded hole B (115) penetrates the wall of the fixed shaft hole B (231). The positioning device A (17) is installed on the outside in cooperation with the threaded hole B (115). The positioning device A (17) includes an external threaded device body (171), a compression spring A (172), and a steel ball B (173). The bushing or flat washer (13) is located at both outer ends of the door hinge (11) and is movablely engaged with the shaft B (12). The shaft B (12) has threaded holes B (122) at both ends. The flat-head screw A (14) matches the threaded holes B (122) to install and fix the shaft B (12) or the shaft B (12) does not have threaded holes B (122) at both ends. 22) Flathead screw A (14) and bushing or flat washer (13); the door leaf fixing component (1) is connected to the connecting fixing shaft hole B (231) end of the rotating arm component (2) through shaft B (12), the flat support A (16) is provided in the inner end of the two connecting fixing shaft holes A (117) of the door leaf hinge (11) and abuts against the connecting fixing shaft hole B (231) end of the rotating arm component (2); shaft B (12) is movably connected to the door leaf fixing component (1), and shaft B (12) is fixedly connected to the connecting fixing shaft hole B (231) end of the rotating arm component (2); the shaft B (12) corresponds to The positioning device A (17) is provided with a circumferential positioning groove or fixed hole (121). The positioning device A (17) controls and limits the relative rotation of the door leaf fixing component (1) and the rotating arm component (2). The shaft hole C (211) end of the rotating arm component (2) is movably connected to the shaft hole D (31) of the door frame fixing seat (3) through the shaft A (4). The flat support component B (5) is located on the inner side of the shaft hole D (31) of the door frame fixing seat (3) and abuts against the shaft hole C (211) end of the rotating arm component (2). The shaft A (4) is welded or riveted to the outer side of the shaft hole D (31) of the door frame fixing seat (3).

2. The concealed hinge structure of the swing arm type according to claim 1, characterized in that: The rotating arm assembly (2) includes a rotating arm A (21), a positioning device B (22), a rotating arm B (23), and a countersunk screw A (24) or a flathead screw A; the rotating arm A (21) includes a fixing part shaft hole C (211), a connecting part A (213), and a connecting section A (214) connecting the fixing part shaft hole C (211) and the connecting part A (213); the positioning device B (22) is located inside or outside the connecting section A (214), and is welded, riveted, or integrally designed with the connecting section A (214); the positioning device B (22) includes a tubular device body (27), a compression spring B (28), and a steel ball A (29); the rotating arm B (23) includes a connecting fixing shaft hole B (231). The connecting part B (232) and the connecting section B (235) of the connecting fixed shaft hole B (231) and the connecting part B (232) are provided. The connecting part B (232) is provided with at least one open insertion groove (233) with countersunk hole matching countersunk screw A (24) and several round countersunk mounting holes B (234) / several open insertion grooves (233) with countersunk hole or round countersunk mounting holes B (234). The rotating arm A (21) is connected and fixed by the connecting part B (232) of the connecting part A (213) and the connecting part B (232) of the rotating arm B (23) with countersunk screw A (24) to form a space A (26) for hiding the door leaf cover sealing strip and a space B (25) for the door frame clearance.

3. The concealed hinge structure of the swing arm type according to claim 2, characterized in that: The connecting part of the rotating arm A (21) and the rotating arm B (23) is designed as at least one open insertion groove (233) with countersunk hole matching the countersunk screw A (24) and several round countersunk mounting holes B (234) / several open insertion grooves (233) with countersunk hole or round countersunk mounting holes B (234), and the connecting part of the rotating arm B (23) is designed as several screw holes.

4. The concealed hinge structure of the swing arm type according to claim 1, characterized in that: The door frame fixing seat (3) is an ear-type door frame fixing seat a (3a). The ear-type door frame fixing seat a (3a) is symmetrically designed with mounting foot plate (36a), ear-type support (37a), and ear-type support bearing surface (37a-1). The ear-type support bearing surface (37a-1) includes at least shaft hole D (31), arc-shaped guide groove (32), and positioning hole (33). The mounting foot plate (36a) is provided with at least longitudinal or transverse oval countersunk mounting hole A (35a).

5. The concealed hinge structure of the swing arm type according to claim 1, characterized in that: The planar support A (16) and planar support B (5) are planar bearing structures with a bushing plus two planar washers or two planar washers with a copper washer sandwiched in between, or planar bearing structures with steel balls or planar washers.

6. The concealed hinge structure of the swing arm type according to claim 1, characterized in that: The door frame fixing seat (3) includes at least a shaft hole D (31), an arc-shaped guide groove (32), a positioning hole (33), a support surface (34), and a mounting foot (36), with a mounting hole C (35) on the mounting foot (36).

7. The concealed hinge structure of claim 6, characterized in that: The door frame fixing seat (3) is designed with an angle limiting stop (37); the mounting foot (36) is provided with a mounting hole C (35) which is a circular or oval mounting hole, and the oval mounting hole is designed with a longitudinal or transverse layout.

8. A concealed hinge structure according to any one of claims 1, 2, 4, 5, and 6, comprising a door leaf fixing assembly a (1a), a hinge assembly (2), a door frame fixing seat (3), and a shaft A (4), characterized in that: The door leaf fixing component assembly a (1a) comprises a door leaf hinge a (11a), a shaft Ba (12a), a bushing or flat washer (13), a flat-head screw A (14), an adjusting screw (15a), a connecting plate (16a), a flat support A (16), a positioning device A (17), a screw hole plate (17a), a mounting plate (18a), a countersunk screw B (19a), a guide sleeve (20a), and a flat-head screw B (21a). The mounting plate (111a) of the door leaf hinge a (11a) is provided with at least a combination of several open mounting holes D (11a-2) and closed mounting holes E (11a-1) for mounting and fixing the flat-head screw B (21a). -1) or a set of open mounting holes D (11a-2), flat-head screw B (21a) connects to the screw hole (17a-1) on the screw hole plate (17a) to fix the door hinge a (11a); the flat-head screw B (21a) passes through the fixing hole (18a-2) on the mounting fixing plate (18a), the guide sleeve (20a), the screw hole plate (17a) and the screw hole (16a-1) on the connecting plate (16a) to connect and fix the mounting fixing plate (18a); the screw hole plate (17a) can be adjusted to be positioned relative to the mounting fixing plate (18a) by adjusting the screw (15a); an outward protrusion (114) is provided on the outside of the connecting fixing shaft hole A (117) that is perpendicular to and intersects the center line of the connecting fixing shaft hole A (117).

1. Threaded hole B (115), the threaded hole B (115) passes through and connects to the wall of the fixed shaft hole A (117). The positioning device A (17) is installed on the outside in cooperation with the threaded hole B (115). The positioning device A (17) includes an external threaded device body (171), a compression spring A (172) and a steel ball B (173). The bushing or flat washer (13) is provided at both ends of the door hinge (11) and is in movable cooperation with the shaft B (12). The shaft B (12) is provided with threaded holes B (122) at both ends. The flat head screw A (14) matches the threaded holes B (122) to install and fix the shaft B (12) or the shaft B (12) is not provided with threaded holes B (122) at both ends and is flat head screw A (14) and bushing or flat washer (13). The door leaf fixing component (1) is connected to the connecting fixing shaft hole B (231) end of the rotating arm component (2) through shaft B (12). The flat support A (16) is located inside the two fixing shaft holes A (117) of the door leaf hinge (11) and abuts against the connecting fixing shaft hole B (231) end of the rotating arm component (2). Shaft B (12) is movably connected to the door leaf fixing component (1) and fixedly connected to the connecting fixing shaft hole B (231) end of the rotating arm component (2). The shaft B (12) is provided with a circumferential positioning groove or fixed hole (121) at the position corresponding to the positioning device A (17). The relative rotation of the door leaf fixing component (1) and the rotating arm component (2) is controlled and limited by the positioning device A (17).The shaft hole C (211) end of the swing arm assembly (2) is movably connected to the shaft hole D (31) of the door frame fixing seat (3) via shaft A (4). The planar support B (5) is located inside the shaft hole D (31) of the door frame fixing seat (3) and abuts against the shaft hole C (211) end of the swing arm assembly (2). Shaft A (4) is welded or riveted to the outside of the shaft hole D (31) of the door frame fixing seat (3).

9. The concealed hinge structure of claim 8, characterized in that: The door hinge a (11a) includes a door hinge b (11b), the door hinge b (11b) includes a double-sided or single-sided grid (113b) mounting surface (111b), a plurality of square mounting holes G (11b-1) and an open square mounting hole H (11b-2); the mounting plate (18a) is provided with at least a plurality of mounting holes F (18a-1) and fixing holes (18a-2).

10. A concealed hinge structure with a rotating arm according to any one of claims 1, 2, 4, 5, and 6, characterized in that: The rotating arm A (21) and rotating arm B (23) are integrally folded or cast rotating arm C (2c). The rotating arm C (2c) or rotating arm A (21) is provided with a fixing part shaft hole C (211), a connecting part including a fixing part shaft hole C (211), a connecting part A (213), and a connecting section A (214) connecting the fixing part shaft hole C (211) and the connecting part A (213). The connecting section A (214) includes at least a fixing part shaft hole C (211), an extension edge (215) of the fixing part shaft hole C (211), an outer bend angle A (216), a vertical edge (217), an outer bend angle B (218), an arc-shaped surface (219), an inner bend angle (220), and a straight edge A (221) or a fixing part. Shaft hole C (211), fixed part shaft hole C (211) extension edge (215), bend outer angle A (216), vertical edge (217), bend outer angle B (218), hypotenuse A (222), bend outer angle C (223), straight edge B (224), bend outer angle D (225), hypotenuse B (226), bend inner angle (220) and straight edge A (221) or fixed part shaft hole C (211), fixed part shaft hole C (211) extension edge (215), bend outer angle A (216), vertical edge (217), R arc angle (227), straight edge B (224), bend outer angle D (225), hypotenuse B (226), bend inner angle (220) and straight edge A (221).

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