TWM308613U - Hinge with reduced number of parts - Google Patents

Description

M308613 VIII. New description: [New technical field] This creation is a kind of hinge for reducing parts. It refers to a kind of installation between the upper cover and the base of the flip cover device, so that the upper cover can be opened and closed relative to the base. The hub. [Prior Art] General clamshell electronic devices, such as notebook computers, mobile phones

4. A hinge is arranged between the upper cover and the base. The hinge mainly enables the upper cover to open and close relative to the base. With the evolution of the manufacturing technology of the hinge and the increasing demand of the user, the prior art hub can not only The upper cover is opened and closed relative to the base, and the upper cover can be rotated relative to the base, so as to facilitate the user to conveniently use the electronic device at any angle, and in order to avoid the electronic device from being damaged to the fork and to maintain the normal operation of the electronic device, The prior art hinge device may have a structure J for positioning and limiting the upper cover relative to the base. In order to enable the upper cover to open and close and rotate relative to the base, and in order to have the functions of clamping and limiting, the prior art hinge structure is complicated. And the components are sturdy + but the production cost is high and the assembly difficulty is also high, so the prior art hub has an improved space. [New content] The shortcomings of the existing hinges on the side of J, this creation department is designed to reduce the hub of the parts@络&&&, ^ ... which maintains the function of the hub itself and can effectively reduce the parts of the hinge. In order to achieve the above-mentioned creative purposes, the technical means adopted in this creation is to design a hub for reducing parts, and the towel comprises: ·,,, 5 M308613, a flute-support, which has a bottom plate and is respectively formed on the bottom plate. The first side flap and the second side wing at both ends; the package person-: the opening and closing shaft group, which is connected with the first side wing, the first opening and closing shaft group can be the shaft and the first rotating bracket, and the rotating shaft is disposed at the One side of the wing is up; rotating on the first side wing, the first rotating bracket is sleeved and fixed on the rotating shaft

The first opening and closing axis group of the deaf person is connected with the second side wing, the second opening and closing shaft group port and the second rotating frame, and the fixed shaft section is non-circular, :: axis first end In the second side wing, the second end of the fixed shaft extends axially to a '° 卩 疋. The outer diameter of the shaft decreases from the first end to the second end. The rotating frame is sleeved on the second end of the fixed shaft and Abutting against the annular protrusion; the rotating shaft set is connected to the bottom plate, the rotating shaft set includes a central shaft and a fixed bracket, the central shaft is disposed in the bottom plate and can be rotated relative to the bottom plate Fixed at the end of the center shaft. The hinge of the creation is installed between the upper cover of the clamshell device and the base, and the fixed bracket of the rotating shaft set and the upper cover of the clamshell device are fixed to each other, and the bases of the first and second rotating brackets and the clamshell device are mutually fixed. The advantage of this creation is that the use of a fixed shaft shaped like a class allows the fixed shaft itself to replace the arrangement of a plurality of spacers to reduce parts, thereby reducing manufacturing costs and assembly steps. [Embodiment] Please refer to the first and second figures. The creation includes a center frame (10), a first opening and closing axis group (2 〇), and a second opening and closing axis group (3 〇). And a rotating shaft group (40). 6

M3 08613 Please refer to the third and fourth figures. Yiyi is open, H+ is not, ^The central frame (1 0) is the threshold/slice, the central frame (I n 笛一伽习,木1 10) having a bottom plate (1 1 ), a (1 1 2 3 ) and a second side wing (丄3); a central hole (1 1 1) is formed through the center (1 1), the bottom plate C 1 1) Two ribs (1 1 2 ) are respectively formed on the two sides of the adjacent seven workers A y at both ends, and the side ribs τ η 0, ^, the distal ribs (112) have a certain height, the bottom plate ( 1 1) The bottom side is located at the center hole (^, the periphery of the hole (111) is concavely formed with at least one positioning recess (&gt;1 Ί ^ 'the top side of the bottom plate (1 1 ) is located at the periphery of the center hole (1 1 1 ) Extendedly formed with at least one limiting protrusion (Η 4) 'the bottom side of the bottom plate (1 1) is concavely formed along the circumference of the central hole &quot;n) and the positioning recess (1 1 3) has a ring groove (丄丄5) The two side wings (1 2 ) ( ! g, eight w + < 丄 3 ) are respectively vertically formed at the two ends of the bottom plate (1 1 ), and a central hole is formed through the center of the first side wing (Ip, 丄2) (1 2 7 1 ), the first flank (1 ?, + & μ工, 丄匕) The inner side surface is concavely formed with a ring-shaped concave groove (122) in a periphery of the center hole (1 2 1 ), and a bevel surface t, 丄2 3 ) is formed on the circumference of the ring groove (122), and the first side wing (1 2 ) The inner side surface is formed with a limiting protrusion (丄2 2 4) at the periphery of the annular recess #(1 2 2 ), and the outer side of the first side flap (i 2) is concavely formed at the periphery of the central hole (working area 2) a r, a long groove (1 2 5 ), and a ring groove on the outer side of the first side wing (1 2 ) (&quot;1 9 =, ± & 1 ^ 1 , 丄 25) has a concave shape at least a positioning recess (1 2 6 ), an annular oil groove (1 2 7 ) is concavely formed on the outer side of the first side I ( 1 2 ); a non-circular perforation is formed through the center of the first side wing (13). 1 3 1)° M3 08613 Please refer to the first and second figures of the first opening and closing axis group (2 〇) and the center frame (1 〇) as shown in the third and fourth figures. , 9, 4 Λ The training C 1 2 ) is connected, the first opening and closing axis group (20) includes a rotating shaft (2 1 ), π, 匕丄) convex positioning piece (22), fixing piece (2 one brother one Rotating frame (23), a gasket (24) and 5); ~ shaft (2 1 ) The axial extension of the end is formed by a shaft (211) having a non-circular cross section, the shaft (211) can be a screw, and the shaft (2 11) is disposed through the central hole of the first side (i 2) ( In the 丄2 work), the other end of the rotating shaft (2 1 ) is radially extended to form a positioning crown (2丄2), and the shaft rod (2 1 1 ) is radially extended to form a limiting crown (2 working 3) The limit crown (2 1 3 ) is adjacent to the inner side of the first side wing (Work 2), and the limit crown (213) is radially extended to form a fan-shaped limit protrusion (2 1 4 ) , the limit crown (2 ! 3 ) is adjacent to the first side wing (丄 2) / side extension molding has a ring protrusion (215), the rotation axis (21) = ring protrusion (2 i 5 ) relative to the first A positioning protrusion (2 16) is formed on the inner side of the groove (122) of the side wing (122), and the positioning piece (2 16) is axially extended; the tenon piece (22) is sleeved and fixed to the rotating shaft (21) On the shaft (211), the convex positioning piece (22) is adjacent to the first side wing (I). ) On the outside side, please refer to the sixth and seventh figures. The convex positioning piece (2 2 ) = elastic piece body, and the convex positioning piece (2 2 ) has a radial cross-sectional shape of <shaped shape: the convex positioning piece is made (2 2 ) &lt; the edge abuts against the center of the side flank (2 2 ) of the first side flap (1 2 ) and extends away from the first side wing (1 ) to form a central convex portion, and the convex positioning piece 8

M3 08613 (2 2) adjacent to the side of the first positioning convex portion (2", ) extending at least - 2 2) phase cake in the Chu-' convex positioning piece (2 2) positioning convex portion (2,; The positioning recess (1 2 6 ) of the side flap (1 2 ); the first rotating bracket (23) on the shaft rod (211), the flute #疋疋辨神, Z_L) 9, ^) (2 3) and the convex positioning piece (2 mesh: "moon fitting refer to the sixth rotating frame (2) of the first rotating bracket (2), the side of the convex positioning piece (22) is extended to form a central convex portion (2) &quot;The central convex part (231) of the 帛一红转架 (23) 盥 locating piece (2...the central convex part (22 &quot;opposed to force) and can be changed by changing the first rotating frame ( 23) Middle ~ convex Deng (23 1) #height' and change the degree of tension of the first rotating frame (2 3 ) to the convex positioning piece (2 2 ); the spacer (2 4 ) is set on the rotating shaft (2丄) shaft (2 completion) The upper fixing piece (25) is sleeved and fixed to the end of the shaft (2 1 1 ) of the rotating shaft (21), and the fixing member (25) can be a nut and The shaft (2 1 1 ) is screwed and fixed. Please refer to the third opening and closing shaft mentioned in the third to fifth figures. (3 〇) is connected to the second side wing (13) of the center frame (1 〇), and the second opening and closing shaft set (30) includes a fixed shaft (31) and a second rotating frame (32). The fixed shaft (31) has a non-circular cross section, and the external control of the fixed shaft (31) is stepped down from the first end to the second end, and the fixed shaft (3 1 ) has the largest outer diameter crown (3 1 3) The first-order part (3 1 4 ) with the largest outer diameter and the last-stage part (3 1 5 ) with the smallest outer diameter, see the fourteenth and fifteenth figures, the fixed shaft (3 1) Crown (3 1 3) 9 M3 08613 2: Retaining (10) side (11) side radial extension forming - extension wing (3i7), extension wing (317) and bottom plate (but against to enhance overall stability, The first step of the fixed shaft (31) (: 14) is pierced and fixed to the second side flap (13) (3): the end of the 'solid block# (3 1) (3 1 5) axially extending the forming ring protrusion (3 1 1 )' or as shown in the fourteenth and fifteenth figures, the outer side wall of the Pth self-stage (3 1 4 ) of the fixed shaft (3 1 ) is formed Hong tail bump

The second rotating bracket (3 2 ) is sleeved on the fixed shaft (3 working) end portion (3 1 5 ) and abuts against the annular convex portion (3丄丄), and the annular convex portion (3 1 1 ) is pressed The straightness is greater than the diameter of the end of the fixed shaft (3丄) to prevent the second rotating bracket (32) from being axially disengaged from the shaft (3 1 ), and a plurality of notches (312) are formed on the ring protrusion (311). . Referring to Figures 3 and 4, the rotating shaft set (4〇) is connected to the bottom plate (1 1 ) of the middle to the bearing (1 〇), and the rotating shaft set (4 〇) includes a central axis (41). a spring piece (42), a convex positioning piece (316) for abutting against the second side wing (&quot;), and avoiding the axial separation of the second side wing (丄3) of the solid axis _(3 1 ), or As shown in the sixteenth figure, the 'fixed shaft (31) and the second side flap (&quot;) are integrally formed; (43), a limit piece (44), a limit block (45), and a fixed frame (4) 6); The central shaft (4 1 ) is disposed in the central hole (worker 1) of the bottom plate (1 1 ), and one end of the central shaft (4 1 ) is radially extended to form a limit crown (4 1 1 ) The crown portion (4 1 1 ) has two opposite limiting sides (4 1 2 ) and two opposite planar sides (4 1 3 ), and the limiting side (4 1 2 ) M308613 to the limit position is difficult 4 (4 1 1 The distance between the center is greater than the distance from the plane side (4 1 3 ) to the center of the limit domain (4 1 1 ), and the limit of the center car from (4 1 ) is 相对 (4 1 1 ) relative to the first-opening axis Limiting crown (2丄3) of the shaft (2 1 ) of the group (2 0 ), the limit of the central axis (4丄) The crown portion 11) is formed by a ring groove (414) in a radially concave shape, and a ring groove (4 work 4) of the central axis (4 1 ) is opposite to the central axis (4 1 ) of the convex portion of the central shaft (4) The axial extension is formed with a plurality of fixing protrusions (4 1 5 ); the piece (4 2 ) is sleeved on the central axis (4 i ), and the convex positioning piece (43) is sleeved and fixed at the center, (41) The convex positioning piece (43) is adjacent to the bottom side of the bottom plate (11) of the center bearing 〇 〇 ,, and the convex positioning 4 3 ) extends relative to the side of the bottom plate ( 431) 43) the positioning protrusion (43) is opposite to the positioning recess (ii 3) of the bottom plate (ii); the two-piece piece (44) is sleeved on the central axis (4 &quot;, limited = circumferentially extending radially to form a fan-shaped limit The convex portion (:=45) is sleeved and fixed on the central axis (the upper limit block), the limit block &quot;: has a certain thickness, and the limit block (45) is adjacent to the limit block (45) with respect to the limit piece "4) There is a ^ 4 4 } side axial extension forming 1 (457? / ^ (451), &quot;&quot; ^ (45) - 451) relative to the limiting piece (44) of the limit convex (4 〇), see the thirteenth figure, the limit convex part of the position piece (44) (441 = real % example In the middle, the limit piece (4 4 ), the moon system 1) is axially extended to the limit) the circumference 'is opposite to the first limit of the limit block (45) 11 M308613 bump (4 5 1 ), the limit block (4 5) different from the limiting piece (4 4 ), one side of the axial extension is formed with a second limiting protrusion (4 5 2 ); the fixed frame (4 6) is sleeved and fixed to the central axis (4 1 At the end, a fixing hole (461) is formed through the center of the fixing bracket (46), and a plurality of fixing recesses (462) are formed in the inner wall surface of the fixing hole (46 1), and the fixing recess of the fixing bracket (46) is fixed. (462) and

The fixing protrusions (4 1 5 ) of the center shaft (4 1 ) are fitted together. Please refer to the thirteenth figure. The fixed bracket (46) is adjacent to the limiting block (45), and the fixed frame (4) 6) relative to the limiting block (45), at least one limiting protrusion (4 6 3 ) is formed by axially extending, and the limiting protrusion (4 6 3 ) of the fixed receiving frame (4 6 ) is opposite to the limit The second limit bump of the bit block (45) is (452). Please refer to the third and eighth figures. The creation is installed between the cover (50) and the base (60) of the electronic device. The rotating shaft set (4〇): the carrier (4 6 ) and the upper cover ( 5 0) The two rotating brackets (32) of the first opening and closing axle (20) and the second rotating bracket (32) of the second opening and closing axle (3 upper) are The bases (60) are fixed to each other, and the eye fittings are shown in the figure IX. When the upper cover (5 〇) is opened and closed relative to the base (6 〇), the upper cover (5 〇) drives the center frame (10) and the rotating shaft stage. (4 0 ) Relative to the first and second rotating brackets (2 3 ) ( 3 2 ): Turn 'Please refer to the tenth figure, when the upper i ( 5 〇) is rotated relative to the bottom (6 〇) The upper cover (50) drives the fixed frame (46) to rotate relative to the center frame (10). Please refer to the third, eighth and ninth diagrams. When the upper cover (5 〇) phase 12 M308613 (4 6 ) drives the rotary shaft to rotate, the center support (1 open and close shaft set (2 〇) for the base (6 Ο) When opening and closing, the first frame (1 2 ) of the fixed frame (40) and the center frame (丄〇) 旋转 is rotated relative to the first to the axis (21); (20) The convex positioning piece shafts (2 1 ) are fixed to each other, so the first side. Rotate (2 2 ) rotation, when the first side wing (relative to the convex positioning 〇, t positioning recess

3) Positioning convex with the convex positioning piece (2 2 ) (1 1 upper cover (5 〇) is positioned relative to the base (6 〇) · when the target is closed] due to the first flank (1 2 ) relative to the first flank of the rotating shaft (1 2) The limit convex part (丄2 ★ turn, when 丄24) and the turn of the turn by "9ί, = position...210, limit the angle of the upper cover (50" i on the base (θ 〇) opening and closing ; 3 0) relative to the axis (21) of the limit crown (213 ^ ^ 2) (four), the inner side of the shaft friction, the first side wing (the flank (1 2) groove (&quot; 2) and the slope; 123: The ring with a concave surface on the side is prepared for the friction of the material when the material is pressed. The crown of the crown (1) 3) is worn. 2) The inner side is restricted 2) Relative to the first side wing (12) = ' Similarly, when the outer side of the 'protruding positioning piece (2, 〇2) is rotated, the outer side of the ring groove (, 2) on the outer side of the first side (1 2) is worn. 125) Slow down the first flank (1 〇) Γ See Figures 3, 4, 8, and 10 to 12, when the upper cover (50) is rotated relative to the base (60) to rotate the field cover lb, The fixed frame (4 6 ) drives the central axis ( 4 1 ) of the M308613 rotating shaft set (40) to rotate relative to the center frame (work 0); due to the convex positioning piece (4 3 ) of the rotating shaft set (40) Fixing with the central shaft (4 1 ), the convex positioning piece (43) rotates relative to the bottom plate (11) of the center frame (work 0), and the positioning protrusion (431) and the bottom plate of the convex positioning piece (43)上) when the positioning recess (113) is fitted, the upper cover (50) is positioned relative to the base (6〇);

Since the limiting block (45) and the central axis (4 1 ) are fixed to each other, the limiting block (45) rotates relative to the limiting piece (4 4 ), and the first limiting convex of the limiting block (45) Block (4 5 1 ) and limit tab (4 4 ) limit bump (4 4 1 ) ( 4 4 1 '), and limit block (45) second limit bump (4 5 2 ) resisting the limit projections (4 6 3) of the fixed bracket (4 6 ), limiting the angle of opening and closing of the upper cover (50) relative to the base (60); - when the convex positioning piece (4 3 ) When rotating relative to the bottom plate (1 1 ), the tabs (43) and the bottom side of the bottom plate (11) rub against each other, and since the bottom side of the bottom: b) is provided with a concave ring groove (115), the same can be slowed down. The degree of wear on the bottom side of the bottom plate (11); : Medium: Axis (4 η limit crown (41 U on the plane side (4 ::= shaft (21) limit crown (213), medium. (4D limit crown (411) limit crown (2 i 3 ) rotation axis C... The first - opening and closing axis group (2〇) turn ^ center axis (41) can be relative to the body axis (2 1) Rotation; when the central axis (4·1) $ pp α ) is limited to the limit side of the crown (41 1) (4 14 M308613 1 2 ) When the limit crown (2 1 3 ) of the rotating shaft (2 1 ) is limited, the positioning convex portion (2 1 6) and the central axis (4 1 ) of the limiting crown (2 1 3) of the rotating shaft (2 1 ) The ring groove (4 work) of the crown (4 1 1) is only inserted into &amp; ', then the upper cover (5 0 ) is restricted to open and close the rotating shaft set (40) with respect to the base (60). It can avoid damage caused by malfunctions. [Simplified description]

The first picture is the three-dimensional appearance of the creation. The second picture is the perspective view of the other perspective of the creation. The second picture is the exploded view of the creation. The fourth picture is an exploded view of another perspective of the creation. The sixth drawing of the components of this creation is the side view of the creation. The seventh view is the top view of the creation. The view of the creation is the end view of the creation state. The ninth 11 is the action end view of the creation state. The tenth figure is the action perspective view of the creation. The eleventh figure is the action side view of the creation. The eleventh figure is the action of the creation. The twelfth figure is an exploded view of another embodiment of the present creation. The fifteenth drawing of the components of the present invention is a side cross-sectional view of the components of the creation. FIG. 16 is a side cross-sectional view of another embodiment of the creative component. [Main component symbol description] 15 M308613

(1 ο) center frame (1 1 1 ) center hole (1 1 3 ) positioning recess (1 1 5) ring groove (1 2 1 ) center hole (1 2 3 ) bevel (1 2 5) ring groove (1 2 7) oil groove (1 3 1 ) perforation (2 1 ) rotation axis (2 1 2 ) positioning crown (2 1 4 ) limiting convex part (2 1 6 ) positioning convex part (2 2 1 ) central convex Part (2 3 ) first rotating bracket (2 3 2 ) central recess (2 5 ) fixing member (3 1 ) fixed shaft (3 1 2 ) notch (3 1 4 ) first step portion (3 1 6 ) Bump (3 2 ) second rotating frame (4 1 ) central axis (4 1 2 ) limiting side (1 1 ) bottom plate (112) side rib (1 1 4 ) limiting convex portion (1 2 ) first Flank (1 2 2 ) ring groove (1 2 4 ) limiting protrusion (1 2 6 ) positioning recess (1 3 ) second side wing (20) first opening and closing axis group (2 1 1 ) shaft ( 2 1 3) Restricted crown (215) ring convex part (2 2 ) convex positioning piece (2 2 2 ) positioning convex part (2 3 1 ) central convex part (2 4 ) spacer (30) Closed axis group (3 1 1 ) ring convex part (3 1 3 ) crown part (3 1 5 ) end stage part (317) extension wing (40) rotation axis group (4 1 1 ) limit crown (4 1 3) Plane side 16 M308613 (414) Ring groove (415) Fixing protrusion (42) Spring piece (43) Positioning piece (4 3 1 ) Positioning block (4 4 Limiting piece (4 4 1 ) limiting convex part (441') limiting convex part (45) limiting piece (4 5 1 ) first limiting convex piece (4 5 2 ) second limiting position convex block (4 6 ) Fixed bracket (461) fixing hole (462) fixing recess (4 6 3 ) Limiting projection (5 0 ) Upper cover # ( 6 0 ) Base

17

Claims (1)

M308613 IX. Patent application scope: 1 · A hinge for reducing parts, including: a central support frame having a bottom plate and a first side wing and a second side wing respectively formed at two ends of the bottom plate; An opening and closing shaft set, which is connected to the first side wing, the first opening and closing shaft group ^: the rotating shaft and the - first rotating bracket, the rotating shaft is disposed in the first side flap and rotates relative to the first side flap - Rotating frame is sleeved and fixed to the shaft Baoren = second opening and closing shaft group, which is connected with the second side wing, the second opening and closing shaft group is fixed by the Q axis and a second rotating frame, and the fixed shaft section is non-circular, solid: shaft The end is disposed in the second side wing, the second end of the fixed shaft extends axially to the portion, and the outer diameter of the fixed shaft decreases in a stepwise manner from the first end to the second end, and the suspected rotating frame is sleeved on the second end of the fixed shaft And abutting against the ring convex portion; a rotating shaft group, which is connected to the bottom plate, the rotating shaft group includes a center=and m "support frame, the car is driven by the bottom plate and can be rotated relative to the bottom plate, and the fixed bearing The frame is sleeved and fixed at the end of the central shaft. ^, 2 · The hinge for reducing parts as described in claim 1 wherein the fixed shaft forms the crown having the largest outer diameter from the first end to the second end, the first step portion and the outer diameter of the outer = second largest The smallest end-stage part, the fixed axis and the # are disposed in the second side wing, the annular protrusion of the fixed shaft extends axially to 1; the end of the fixed-stage part, and the second rotating frame is sleeved on the fixed axis Class department. 〇〇3, as claimed in claim 1 of the patent scope of the invention, wherein the central portion of the second side wing of the center frame is formed with a perforation, and the first stage portion of the 18 M308613 shaft is pierced and fixed. In the perforation of the two side wings. 4. A hub for reducing parts as described in claim 2, wherein the outer side wall of the first-stage portion of the fixed shaft is formed with at least one tail projection, and the dovetail abuts against the second side wing. π. The hinge reducing member of claim 2, wherein the fixed shaft is integrally formed with the second side wing. 6. If you want to reduce the number of drag-and-drop devices as described in any of the first to fifth patent applications, A plurality of notches are formed on the bad tenons of the eight jaw shafts. The hinge reducing member of the sixth aspect of the invention, wherein the fixed shaft extends radially toward the bottom side of the center frame to form an L-extending wing, the extending wing abutting against the bottom plate. ^8 The hinge for reducing parts as described in claim 7 is wherein the outer side of the first side wing is concavely formed with at least one positioning recess, and the convex positioning piece is sleeved and fixed to the first opening and closing shaft group. On the rotating shaft, the convex positioning piece adjacent to the first side wing is convexly formed with at least one positioning convex portion, and the positioning convex portion of the convex positioning piece is located on the positioning concave portion of the first side wing. y • As claimed in the eighth paragraph of the patent application, the inner side of the first-wing is extended with a limit protrusion, and the two crowns: the radial extension of the shaft is formed with a limit crown, and the limit of the shaft Adjacent to the inner side of the first side wing, the shaft is extended to form a limiting protrusion, and the limiting protrusion of the rotating shaft is opposite to the body: Γ: two parts: the limiting crown of the rotating shaft is opposite to the side of the first side wing The % convex portion is extended, and the ring convex portion of the rotating shaft is grooved with respect to the 19 M308613 ring on the inner side surface of the first side wing. The ruthenium of the ninth item of the patent application scope is reduced, and the bottom side of the bottom plate of the center frame is concavely formed with at least one positioning concave portion, and the convex positioning piece is sleeved and fixed to the rotating shaft group. The convex positioning piece of the rotating shaft group on the central axis is adjacent to the bottom side of the bottom plate, and the protruding positioning piece of the rotating shaft group is formed with at least one positioning protrusion with respect to the side of the bottom plate, and the positioning of the convex positioning piece of the rotating shaft group a positioning recess of the protrusion relative to the bottom plate. , / 1 - The dragging device for reducing parts according to the invention of claim 1, wherein the rotating shaft of the first opening and closing shaft group is radially formed with a positioning crown relative to one of the inner sides of the first side wing, positioning The central portion of the crown is axially extended to form a positioning protrusion. The central axis of the rotating shaft group is radially extended with respect to the bottom end of the bottom plate to form a limiting crown. The limiting crown has two opposite limiting sides and two opposite sides. On the plane side, the distance from the limit side to the center of the limit crown is greater than the distance from the plane side to the center of the limit crown, and the limit crown of the central axis For the positioning crown of the rotating shaft of the first opening and closing shaft group, the limiting crown portion of the central shaft is concavely formed with a ring groove, and the ring groove of the central shaft is positioned with respect to the rotating shaft. X. Schema: as the next page 20