Tying device

Abstract

A tie device includes a yoke, an axle pin, and a tie plate. The yoke includes a bottom wall and a pair of pivot ears. The bottom wall and the pivot ears together define a pivot slot. Each pivot ear has a pin hole. The axle pin is inserted into the pin hole. The tie plate is pivoted to the axle pin and includes a middle portion, a first wing, and a second wing. The middle portion has a pivot hole for the axle pin to pass through. The first wing has a first long hole, and the second wing has a second long hole. The pivot hole and the first and second long holes are located on a plane. The distance between the pivot hole and the first long hole is equal to the distance between the pivot hole and the second long hole. The first and second long holes facilitate the installation and removal of the two tie devices, and the force is more evenly distributed.

Description

Technical Field

[0001] The present invention relates to a container fastening device, in particular to a fastening device. Background Art

[0002] Containers loaded onto cargo ships are typically stacked in multiple layers. To prevent the ship from swaying and causing instability, several container tie-downs are used to secure the containers to the deck or bridge. Examples include Taiwan Patents TWI250956, TW M284618, and TW I245730.

[0003] like Figure 1 and Figure 2 As shown, the deck or bridge of a typical cargo ship is provided with a plurality of fixing bases 2 for welding and fixing a plurality of eye plates 1. The eye plates 1 are welded to the top and both side surfaces of the fixing bases 2. Each eye plate 1 has a plurality of circular holes 101, and a plurality of container tie-downs 3 can be pivotally connected to the eye plates 1. The container tie-downs 3 each include a turnbuckle 4 pivotally connected to the eye plate 1 and a lashing rod 5 adjustably locked to the turnbuckle 4. The lashing rod 5 can be hooked relative to a corner casting of a container 6 (corner casting of container).

[0004] For example Figure 1 and Figure 2 As shown, when in use, the fastening member 4 of the container tie 3 is pivotally connected to the circular hole 101 of the tie plate 1 using a shaft pin 401, so that the container tie 3 can be positioned on the deck or bridge of the cargo ship. The other end is buckled into a preset buckle hole 601 of the container corner 601 of the container 6 by using a tie rod head 501 of the tie rod 5, so that the container 6 can be firmly positioned.

[0005] Although the above-mentioned combination of the tie plate 1 and the container tie 3 can achieve the purpose of fixing the container 6, Figure 3 and Figure 4 As shown, when the ship is subjected to wind and waves during transportation and is subjected to an impact force F (as shown by the solid arrow), the container 6 tends to tilt in the opposite direction (see the dotted arrow). After the tie rod 5 is pulled by the container 6, since the ship has no buffer when the impact is applied, it is easy to cause the container 6 or the tie rod 5 to be torn and damaged (see Figure 4 ), more seriously, because the pulling force of the container is eliminated, the container 6 is more likely to tilt (see Figure 4 Left side), and even cause damage to the container 6 and loss of goods.

[0006] Furthermore, when the two tie rods 5 are pivotally connected to the tie plate 1 , the gap between the tie rods 5 is easily enlarged or reduced due to the change in the tie angle, and thus, it is easy to accidentally pinch the operator's hand during operation.

[0007] The container tie assembly disclosed in German Patent Publication No. DE202017103865U1 also has the above-mentioned problems.

[0008] Taiwan Patent No. TW I641770 has been able to overcome the above-mentioned shortcomings, but the applicant believes that the force uniformity of the tie plate can be further improved, which ultimately led to the birth of the present invention. Summary of the Invention

[0009] The object of the present invention is to provide a tying device that can solve the existing deficiencies.

[0010] The tying device described in the present invention includes a yoke seat, an axle pin and a tying plate, the yoke seat includes a bottom wall, and a pair of pivot ears connected to the bottom wall and arranged at intervals, the bottom wall and the pivot ears jointly define a pivot slot, each of the pivot ears has a pin hole, the pin hole is arranged along the center line, the axle pin is passed through the pin hole, the tying plate is plate-shaped, pivotally arranged on the axle pin and rotatably installed in the pivot slot, the tying plate includes a middle part, a first wing connected to one side of the middle part, and a second wing connected to the other side of the middle part, the middle part has a pivot hole for the axle pin to pass through, the first wing is connected to the other side of the middle part, the middle part has a pivot hole for the axle pin to pass through, the second wing is connected to the other side of the middle part, the middle part has a pivot hole for the axle pin to pass through, A wing member has a first connecting end portion connected to the middle portion, a first terminal portion opposite to the first connecting end portion, and a first long hole arranged between the first connecting end portion and the first terminal portion; the second wing member has a second connecting end portion connected to the middle portion, a second terminal portion opposite to the second connecting end portion, and a second long hole arranged between the second connecting end portion and the second terminal portion; the pivot hole and the first long hole and the second long hole are located on a plane; the distance between the pivot hole and the first long hole is equal to the distance between the pivot hole and the second long hole.

[0011] The tying device described in the present invention, the tying plate also includes a bottom edge adjacent to the bottom wall, a top edge opposite to the bottom edge, a first side edge connected between the bottom edge and the top edge and arranged on the first wing, and a second side edge connected between the bottom edge and the top edge and arranged on the second wing, the long axis length of the first long hole and the second long hole between the top edge and the bottom edge is greater than the short axis length between the first side edge and the second side edge.

[0012] In the binding device described in the present invention, the pivot hole of the binding plate is concentrically arranged with the pin hole and is also arranged along the center line. The first long hole and the second long hole each have a first arc center line that produces a first circular arc segment, and a second arc center line that is spaced apart from the first arc center line and produces a second circular arc segment. The center line and the first arc center line are located on the plane, and the long axis of the first long hole is parallel to the long axis of the second long hole.

[0013] The tying device described in the present invention defines a first reference plane tangent to the end edge of the first arc segment of the tying plate, and a second reference plane tangent to the end edge of the second arc segment of the tying plate, and the plane is arranged parallel to the first reference plane and the second reference plane.

[0014] In the tying device described in the present invention, the bottom wall of the yoke has a first abutment surface, the pivot ears each extend along an axis passing through the center line, and the axis extends at an inclination relative to the first abutment surface, and the inclination angle of the axis relative to the extension surface of the first abutment surface is between 40 and 50 degrees.

[0015] In the fastening device of the present invention, the pivot ears of the yoke each have an index portion, and the first wing of the fastening plate has an indicating portion that can correspond to the index portion.

[0016] In the tying device described in the present invention, the bottom wall of the yoke seat also has a second abutment surface in an L-shape intersecting with the first abutment surface, and a corner line between the first abutment surface and the second abutment surface, and the corner line is inclined relative to the center line.

[0017] The tying device described in the present invention has a bottom wall of the yoke seat with a stop block protruding toward the pivot groove, and the cross-section of the stop block perpendicular to the center line is in an inverted L-shape. The bottom edge of the tying plate has a groove for the stop block to extend into, and the cross-section of the groove perpendicular to the center line is in an inverted L-shape.

[0018] In the tying device of the present invention, the bottom wall of the yoke has a bottom surface opposite to the stopper, and the bottom surface is flat.

[0019] In the tie-down device of the present invention, the pivot ears of the yoke each extend along an axis passing through the center line, and the axis extends obliquely relative to the bottom surface, and the inclination angle of the axis relative to the bottom surface is between 40 and 50 degrees.

[0020] The beneficial effects of the present invention are as follows: the setting of the first long hole and the second long hole is utilized to facilitate the installation and disassembly of the two tie-down devices, and the pivot hole and the first long hole and the second long hole are located on the same plane, and the distance between the pivot hole and the first long hole is equal to the distance between the pivot hole and the second long hole, and the force on the tie-down plate is made more even, which can improve the tie-down positioning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a conventional lashing plate in combination with a container tie to secure a container loaded on a ship.

[0022] Figure 2 yes Figure 1 A partial enlarged schematic diagram;

[0023] Figure 3 This is a schematic diagram of the existing hull swaying and the container tie-down being pulled and stressed;

[0024] Figure 4 This is a schematic diagram of an existing container having its corner pulled and damaged;

[0025] Figure 5 is an exploded perspective view of a first embodiment of the tying device of the present invention;

[0026] Figure 6 is a plan view of a tie plate of the first embodiment;

[0027] Figure 7 is a combined sectional view of the first embodiment;

[0028] Figure 8 is a front view installation diagram of the first embodiment;

[0029] Figure 9 This is a top view of the installation of the first embodiment;

[0030] Figure 10 is a front view schematic diagram of the first embodiment;

[0031] Figure 11 is a top view schematic diagram of the first embodiment;

[0032] Figure 12 yes Figure 11 A partial enlarged schematic diagram;

[0033] Figure 13 is another schematic diagram of the first embodiment in use;

[0034] Figure 14 is an exploded perspective view of a second embodiment of the tying device of the present invention;

[0035] Figure 15 is a plan view of a tie plate of the second embodiment;

[0036] Figure 16 is a front view installation diagram of the second embodiment;

[0037] Figure 17 is a front view schematic diagram of the second embodiment;

[0038] Figure 18 is a top view schematic diagram of the second embodiment;

[0039] Figure 19 yes Figure 17 A partial enlarged schematic diagram;

[0040] Figure 20 1 is another schematic diagram of the second embodiment in use.

[0041] Figure 21 is an exploded perspective view of a third embodiment of the tying device of the present invention;

[0042] Figure 22 is a front view installation diagram of the third embodiment;

[0043] Figure 23 is a top view of the installation of the third embodiment;

[0044] Figure 24 is a front view schematic diagram of the third embodiment;

[0045] Figure 25 is a top view schematic diagram of the third embodiment;

[0046] Figure 26 yes Figure 24 a partially enlarged schematic diagram of ; and

[0047] Figure 27 FIG. 4 is another schematic diagram of the third embodiment in use. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0049] See Figures 5 to 9 The first embodiment of the tying device of the present invention is suitable for being fixed on the top of a vertical column 100, and the vertical column 100 has two corner ends 110 that are substantially vertical and inverted L-shaped. The tying device includes a yoke 10, an axle pin 20 and a tying plate 30.

[0050] The yoke 10 includes a bottom wall 11 and a pair of spaced-apart pivot ears 12 connected to the bottom wall 11. The bottom wall 11 and the pivot ears 12 together define a pivot slot 13. The bottom wall 11 has a top surface 111 adjacent to the pivot slot 13, a first abutting surface 112 opposite the top surface 111, an L-shaped second abutting surface 113 intersecting the first abutting surface 112, and a corner line 114 between the first and second abutting surfaces 112, 113. The top surface 111 has a straight section 115 and two inclined sections 116 intersecting at an angle on either side of the straight section 115. The inclined sections 116 gradually slope downward as they extend from one end connected to the straight section 115 to the other end. Each of the pivot ears 12 has a pin hole 121 and an indicator portion 122 provided on one side of the pin hole 121. The pin hole 121 is provided along a center line L1. The corner line 114 is provided at an angle relative to the center line L1. Each of the pivot ears 12 extends along an axis L2 passing through the center line L1. The axis L2 extends at an angle relative to the first abutting surface 112 (see FIG. Figure 7 ), the axis L2 has an inclination angle θ1 relative to the extension of the first abutting surface 112 ranging from 40 to 50 degrees, with the optimal angle θ1 being 45 degrees. Furthermore, an installation angle θ2 is defined between the corner line 114 and the center line L1, which can be machined to a suitable angle based on installation requirements.

[0051] The shaft pin 20 is inserted into the pin hole 121 .

[0052] The eye plate 30 is plate-shaped, pivotally mounted on the axle pin 20 and rotatably installed in the pivot groove 13. The eye plate 30 includes a middle portion 31, a first wing 32 connected to one side of the middle portion 31, a second wing 33 connected to the other side of the middle portion 31, a bottom edge 34 adjacent to the bottom wall 11, a top edge 35 opposite to the bottom edge 34, a first side edge 36 connected between the bottom edge 34 and the top edge 35 and arranged on the first wing 32, and a second side edge 37 connected between the bottom edge 34 and the top edge 35 and arranged on the second wing 33.

[0053] The middle portion 31 has a pivot hole 311 for the pivot pin 20 to pass through.

[0054] The first wing 32 has a first connecting end 321 connected to the middle portion 31, a first terminal portion 322 opposite to the first connecting end 321, a first long hole 323 arranged between the first connecting end 321 and the first terminal portion 322, a first stop block 324 corresponding to the first long hole 323 and protruding from the top edge 35, and an indicating portion 325 corresponding to the indicator portion 122. The first long hole 323 has a major axis length l1 between the top edge 35 and the bottom edge 34, which is greater than a minor axis length l2 between the first side edge 36 and the second side edge 37.

[0055] The second wing 33 has a second connecting end 331 connected to the middle portion 31, a second terminal portion 332 opposite to the second connecting end 331, a second long hole 333 arranged between the second connecting end 331 and the second terminal portion 332, and a second stopper 334 corresponding to the second long hole 333 and protruding at the connection between the top edge 35 and the second side edge 37. The shape and size of the second long hole 333 are the same as those of the first long hole 323. The major axis length l1 of the second long hole 333 between the top edge 35 and the bottom edge 34 is also greater than the minor axis length l2 between the first side edge 36 and the second side edge 37.

[0056] The pivot hole 311 and the first long hole 323 and the second long hole 333 are located on the same plane (see FIG. Figure 6 ), a distance d between the pivot hole 311 and the first elongated hole 323 is equal to a distance d between the pivot hole 311 and the second elongated hole 333. The pivot hole 311 is concentric with the pin hole 121 and is also arranged along the center line L1, and the major axis of the first elongated hole 323 is parallel to the major axis of the second elongated hole 333. The first long hole 323 and the second long hole 333 each have a first arc center line L3 that generates a first arc segment 326, 336, and a second arc center line L4 that is spaced apart from the first arc center line L3 and generates a second arc segment 327, 337. The center line L1 and the first arc center line L3 are located on a plane P, defining a first reference plane P1 tangent to the end edge of the first arc segment 326, 336, and a second reference plane P2 tangent to the end edge of the second arc segment 327, 337. The plane P is parallel to the first reference plane P1 and the second reference plane P2.

[0057] In order to further understand the functions, technical means, and expected effects of the various components of the present invention, the following description will be given. It is believed that this will provide a deeper and more specific understanding of the present invention.

[0058] like Figure 10 and Figure 11As shown, when several containers 6 are stacked longitudinally and arranged side by side transversely on the deck of a cargo ship, the several yokes 10 of the tie-down device are welded to the corner ends 110 of several upright columns 100 fixed to the deck or bridge. When the containers 6 are fastened together with a tightening member 4 and a tie rod 5 of several container tie-downs 3, two container tie-downs 3 can be respectively tied between a tie-down plate 30 and two containers 6. One end of each pair of container tie-downs 3 is pivotally connected to the first long hole 323 and the second long hole 333 of each tie-down plate 30, and the other end is respectively hooked into the container corner 601 (corner casting of container) of the two stacked containers 6. Figure 10 As shown, the angle of the container tie 3 connected between the container 6 and the tie plate 30 will be different to match the containers 6 of different heights. The change in the installation angle of the container tie 3 relative to the tie plate 30 is as follows. Figure 12 and Figure 13 The first stopper 324 and the second stopper 334 provide a stopper for the container tie 3, thereby enabling the container tie 3 to extend obliquely at a predetermined angle. The top end is higher than the operator's waist, providing a high enough height for grasping during operation, thereby avoiding the operator having to bend their knees to pick up the item.

[0059] For example Figures 7 to 9 As shown, when the yoke 10 is fixed to the corner end 110 of the upright column 100, the inclination angle θ1 of the axis L2 passing through the center line L1 of the pivot ear 12 relative to the extension surface of the first abutment surface 112 is substantially 45 degrees. At the same time, because the corner line 114 is inclined relative to the center line L1, the installation angle θ2 between the corner line 114 and the center line L1 is processed into a suitable angle according to the installation requirements. When the yoke 10 is fixed to the corner end 110 of the upright column 100, it is skewed, the first abutment surface 112 is fixed to the top of the column, and the second abutment surface 113 is fixed to the side of the column. Moreover, because the rigidity of the corner end 110 is the greatest, the process of welding a reinforcing base plate can be omitted. Furthermore, because the yoke 10 is welded to the corner end 110 of the upright column 100, the first abutment surface 112 is welded to the top of the column, and the second abutment surface 113 is welded to the side of the column, the height of the bending moment can be greatly reduced, thereby reducing the manufacturing volume (because the bending moment is small, the bending moment force becomes smaller), reducing the welding area, and reducing subsequent costs such as materials and welding.

[0060] And as Figures 7 to 9 As shown, when the yoke 10 is fixed to the corner end 110 of the upright post 100, the tie plate 30 pre-assembled on the yoke 10 can also produce a predetermined skew shape relative to the upright post 100, which makes assembly quite easy and positioning quite fast.

[0061] For example Figure 10 and Figure 11 As shown, the first long hole 323 and the second long hole 333 of the tie plate 30 are used to provide the container tie 3 with a pivot connection, which can generate an even distribution of pulling force on both sides of the axle pin 20, and for containers stacked at different heights (different heights, and the pulling angle changes accordingly), all the container tie 3 can apply the same force. Figure 12 As shown, when a cargo ship is impacted by wind and waves during operation, causing the stacked containers 6 to resonate with the twisting of the hull, the first and second elongated holes 323, 333 of the tie plate 30 enable the container tie 3 to slide relative to each other appropriately, absorbing shock forces and cushioning the impact load of waves on the containers 6. Furthermore, by virtue of the major axis length l1 of the first elongated hole 323 being greater than the minor axis length l2, and the major axis length l1 of the second elongated hole 333 being greater than the minor axis length l2, the container tie 3 is limited relative to the minor axis direction of the first and second elongated holes 323, 333, preventing the container tie 3 from deflecting when subjected to force.

[0062] like Figure 7 As shown, the top surface 111 of the yoke 10 has the straight section 115 and the inclined section 116, and the inclined section 116 gradually deflects downward as it extends from one end connected to the straight section 115 to the other end, so that there is a gap between the bottom edge 34 of the tie plate 30 and the top surface 111 of the yoke 10, which allows the tie plate 30 to rotate slightly. The small gap can also avoid the risk of pinching fingers.

[0063] like Figure 7 As shown, the cooperation between the indicator portion 325 of the tie plate 30 and the index portion 122 of the yoke 10 can be used as a reference when rotating the upper and lower sets of container tie-downs 3 to achieve the best construction conditions.

[0064] For example Figure 12 As shown, the first long hole 323 and the second long hole 333 of the tie plate 30 can provide the container tie 3 with a relative sliding effect, so that when the tightening member 4 of the container tie 3 is loosened relative to the pull rod 5, the bottom of the first long hole 323 and the second long hole 333 can provide the mounting positioning of the container tie 3.

[0065] For example Figures 14 to 16 As shown in FIG. 1 , the second embodiment of the tying device of the present invention is applicable to a design without a mast but with a horizontal square tube or the like. The tying device comprises a yoke 10 ′, a support pin 20 and a tying plate 30 ′.

[0066] The yoke 10' includes a bottom wall 11' and a pair of spaced-apart pivot lugs 12' connected to the bottom wall 11'. The bottom wall 11' and the pivot lugs 12' together define a pivot slot 13'. The bottom wall 11' has a stopper 14' protruding toward the pivot slot 13' and a bottom surface 15' opposite the stopper 14'. The stopper 14' has an inverted L-shaped cross-section perpendicular to the centerline L1. The bottom surface 15' is straight and can be securely welded to a horizontal square tube or other flat surface. Each pivot lug 12' extends along an axis L2 passing through the centerline L1. The axis L2 extends at an angle relative to the bottom surface 15'. The angle θ1 of the axis L2 relative to the bottom surface 15' ranges from 40 to 50 degrees, with the optimal angle θ1 being 45 degrees.

[0067] The tie plate 30' includes a middle portion 31', a first wing 32' connected to one side of the middle portion 31', a second wing 33' connected to the other side of the middle portion 31', a bottom edge 34' adjacent to the bottom wall 11', a top edge 35' opposite to the bottom edge 34', a first side edge 36' connected between the bottom edge 34' and the top edge 35' and disposed on the first wing 32', and a second side edge 37' connected between the bottom edge 34' and the top edge 35' and disposed on the second wing 33'. The bottom edge 34' has a groove 341' for the stopper 14' to extend into, and the cross-section of the groove 341' perpendicular to the center line L1 is in an inverted L shape. And the pivot hole 311' and the first long hole 323' and the second long hole 333' are located on the same plane P (see Figure 15 ), the distance d between the pivot hole 311' and the first elongated hole 323' is equal to the distance d between the pivot hole 311' and the second elongated hole 333'. Furthermore, the first elongated hole 323' and the second elongated hole 333' are arranged parallel to each other. A first reference plane P1 is tangent to the end edges of the first arc segments 326' and 336', and a second reference plane P2 is tangent to the end edges of the second arc segments 327' and 337'. The plane P is arranged parallel to the first reference plane P1 and the second reference plane P2.

[0068] like Figures 17 to 20 As shown, the second embodiment of the tie-down device of the present invention can also be used to tie down containers 6 by cooperating with a tightening member 4 and a tie rod 5 of a plurality of container tie-downs 3, and two container tie-downs 3 are respectively tied between a tie plate 30' and two containers 6, thereby achieving the same purpose and effect as the first embodiment.

[0069] like Figures 21 to 23As shown, the difference between the third embodiment of the tying device of the present invention and the second embodiment is that the two yokes 10" are connected as a whole and constitute a yoke unit, the bottom walls 11" of the yokes 10" of the yoke unit are connected as a whole, the pivot ears 12" of the yokes 10" are respectively connected to the corresponding bottom walls 11", and the pivot ears 12" are mirror-symmetrical and V-shaped. Each of the pivot ears 12" is pivoted for a tying plate 30". The shape, structure, pivotal relationship with the yoke 10", and function of the tying plate 30" in this embodiment are the same as those of the tying plate 30' of the second embodiment, so no further explanation is given.

[0070] And as Figures 22 to 26 As shown, when the yoke unit is fixed to the top surface of the upright column 100, the two tie plates 30" pre-assembled on the yoke unit can also produce a predetermined skew shape relative to the upright column 100. The two yokes 10" are connected into one body and form a yoke unit, making the overall assembly easier and positioning faster.

[0071] For example Figure 27 As shown, another use state of the third embodiment of the tie-down device of the present invention is also applicable to designs without a ship's mast but with a horizontal square tube or the like. In combination with the tightening members 4 and tie rods 5 of a plurality of container tie-downs 3, containers 6 can be tied down. Furthermore, two container tie-downs 3 are respectively tied between a tie-down plate 30" and two containers 6, achieving the same purpose and function as the above embodiment.

[0072] In summary, the tying device of the present invention has a simple overall structure and is easy to manufacture and assemble, and can indeed achieve the purpose of the present invention.

Claims

1. A tying device comprising a yoke, a shaft pin and a tying plate, characterized in that: The yoke seat includes a bottom wall and a pair of pivot ears connected to the bottom wall and spaced apart, wherein the bottom wall and the pivot ears together define a pivot slot, and each pivot ear has a pin hole, and the pin hole is arranged along the center line; The shaft pin is inserted into the pin hole; The fastening plate is in the shape of a plate, pivotally arranged on the axle pin and rotatably installed in the pivot groove, the fastening plate includes a middle portion, a first wing connected to one side of the middle portion, a second wing connected to the other side of the middle portion, a bottom edge adjacent to the bottom wall, a top edge opposite to the bottom edge, a first side edge connected between the bottom edge and the top edge and arranged on the first wing, and a second side edge connected between the bottom edge and the top edge and arranged on the second wing, the middle portion having a pivot hole for the axle pin to pass through, the first wing having a first connecting end connected to the middle portion and a first terminal portion opposite to the first connecting end. and a first long hole arranged between the first connecting end and the first terminal portion, the second wing member has a second connecting end connected to the middle portion, a second terminal portion opposite to the second connecting end, and a second long hole arranged between the second connecting end and the second terminal portion, the pivot hole and the first long hole and the second long hole are located on a plane, the distance between the pivot hole and the first long hole is equal to the distance between the pivot hole and the second long hole, the long axis length of the first long hole and the second long hole between the top edge and the bottom edge is greater than the short axis length between the first side edge and the second side edge.

2. The tying device according to claim 1, characterized in that: The pivot hole of the binding plate is concentrically arranged with the pin hole and is also arranged along the center line. The first long hole and the second long hole each have a first arc center line that generates a first arc segment, and a second arc center line that is spaced apart from the first arc center line and generates a second arc segment. The center line and the first arc center line are located on the plane, and the long axis of the first long hole is parallel to the long axis of the second long hole.

3. The tying device according to claim 2, characterized in that: A first reference plane is defined as being tangent to the end edge of the first arc segment of the tie plate, and a second reference plane is defined as being tangent to the end edge of the second arc segment of the tie plate. The plane is parallel to the first reference plane and the second reference plane.

4. The tying device according to claim 3, characterized in that: The bottom wall of the yoke has a first abutment surface, and the pivot ears each extend along an axis passing through the center line, and the axis extends obliquely relative to the first abutment surface, and the inclination angle of the axis relative to the extension surface of the first abutment surface is between 40 and 50 degrees.

5. The tying device according to claim 3, characterized in that: The pivot ears of the yoke each have an index portion, and the first wing of the tie plate has an indication portion that can correspond to the index portion.

6. The tying device according to claim 4, characterized in that: The bottom wall of the yoke seat further has an L-shaped second abutting surface intersecting with the first abutting surface, and a corner line between the first abutting surface and the second abutting surface, wherein the corner line is inclined relative to the center line.

7. The tying device according to claim 3, characterized in that: The bottom wall of the yoke seat has a stopper protruding toward the pivot slot, and the cross section of the stopper perpendicular to the center line is inverted L-shaped. The bottom edge of the tie plate has a groove for the stopper to extend into, and the cross section of the groove perpendicular to the center line is inverted L-shaped.

8. The tying device according to claim 7, characterized in that: The bottom wall of the yoke seat has a bottom surface opposite to the stopper, and the bottom surface is flat.

9. The tying device according to claim 8, characterized in that: Each of the pivot ears of the yoke extends along an axis passing through the center line, and the axis extends obliquely relative to the bottom surface, and the inclination angle of the axis relative to the bottom surface is between 40 and 50 degrees.

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