Lifting device of movable CT (Computed Tomography) machine

Abstract

The utility model relates to a lifting device of a mobile CT (Computed Tomography) machine, which comprises a supporting and fixing component, a guide component, a C ring supporting and connecting component and a lifting driving component, a C ring is separated from an equipment main body of the mobile CT machine, the lifting device is arranged between the C ring and the equipment main body, the supporting and fixing component is connected onto the equipment main body, and the C ring is arranged on the C ring supporting and connecting component. When the lifting driving assembly provides upward thrust for the C-ring supporting and connecting assembly, the C-ring supporting and connecting assembly moves upwards, and the C-ring moves upwards along with the C-ring supporting and connecting assembly. On the contrary, when the lifting driving assembly provides downward force for the C ring supporting and connecting assembly, the C ring moves downwards; the guide assembly limits the movement of the C-ring supporting and connecting assembly in the vertical direction, and the C-ring supporting and connecting assembly is prevented from moving in the horizontal direction due to uneven stress. The lifting device can adapt to body positions of different heights of a patient, and has the advantages that the body position height of the patient does not need to be adjusted, the application range of scanning is expanded, and operation is easy and convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of radiological medical imaging equipment, and in particular to a lifting device for a mobile CT machine Background Art

[0002] A CT machine, namely a computed tomography X-ray machine, emits X-rays through an X-ray tube, rotates to scan a patient, a detector receives the X-ray data passing through the patient, and a computer processes these data to reconstruct tomographic images inside the body for doctors to diagnose. The emergence of mobile CT machines has solved the problem that traditional CT machines are huge in size and cannot diagnose patients immediately. However, the height of the C-ring of the mobile CT machine is fixed, and it is often impossible to effectively diagnose patients with body positions that cannot be adjusted in height. The existing solutions usually adjust the patient's body position to adapt to the fixed height of the CT machine. This method has great limitations for patients with body positions that cannot be adjusted in height (such as patients lying on different operating tables and stretchers).

[0003] The invention patent application CN104814755A discloses a movable radiology CT device. The CT device includes a device bearing base. A bearing loading groove is provided on the lower side of the device bearing base. A roller bearing is provided on the lower side of the bearing loading groove. A rotatable support arm is provided on the right side of the device bearing base. An instrument operation switch is provided on the front side of the device bearing base. A support plate placement groove is provided on the left side of the device bearing base. A sliding convex strip is provided on the upper side of the device bearing base. A ray emission line processing cylinder is provided inside the device bearing base. A collection suction cup is provided on the upper side of the ray emission line processing cylinder. When medical staff perform a CT examination on a patient, first insert a safety plug to connect the examination device to the power supply, and then pull the movable inspection protective cover to a suitable position by pulling the handle frame, let the patient lie on the upper side of the device bearing base, and the medical staff press the instrument operation switch to start the instrument.

[0004] It can be seen from the relevant prior art that the mobile CT device is fully functional and easy to use. When medical staff perform a CT examination on a patient, it is relatively time-saving, labor-saving, safe, efficient, intelligent and accurate, reducing the work difficulty of medical staff. However, the disadvantage is that it cannot move the patient's body position, and there are certain loopholes in the existing methods. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, one of the purposes of the present utility model is to provide a lifting device for a mobile CT machine. The main improvement lies in controlling the lifting of the C-ring to achieve the purpose of performing a CT scan on a patient without adjusting the height of the patient's body position, with a simple structure, convenient use, and without losing the flexibility of the mobile CT machine.

[0006] The above-mentioned invention purpose of the present utility model is achieved through the following technical solutions. A lifting device for a mobile CT machine is proposed, including:

[0007] A support and fixing component, having a first contact surface for connecting the main body of a mobile CT device, and a lower mounting connecting plate is provided on a second contact surface of the support and fixing component relative to the first contact surface;

[0008] A guiding component, including a first guiding member and a second guiding member fixedly connected to one side of the lower mounting connecting plate;

[0009] A lifting driving component, capable of lifting and lowering based on the guiding of the guiding component, and one end of the lifting driving component is connected to the support and fixing component;

[0010] A C-ring support and connection component, connected to the other end of the lifting driving component, the C-ring support and connection component has a third contact surface and a fourth contact surface for connecting the C-ring, an upper mounting connecting plate is provided on the third contact surface of the C-ring support and connection component, and the second guiding member is fixedly connected to one side of the upper mounting connecting plate.

[0011] By adopting the above technical solution, the C-ring is separated from the main body of the mobile CT machine, and the lifting device of the mobile CT machine is installed between the two. The support and fixing component is connected to the main body of the device, and the C-ring is installed on the C-ring support and connection component. When the lifting driving component provides an upward thrust to the C-ring support and connection component, the C-ring support and connection component moves upward, and the C-ring moves upward together; when the lifting driving component provides a downward force to the C-ring support and connection component, the C-ring support and connection component moves downward, and the C-ring moves downward together; the guiding component restricts the movement of the C-ring support and connection component in the vertical direction, preventing it from moving horizontally due to uneven force, and changing the height of the C-ring to adapt to the body position heights of different patients.

[0012] In a preferred example, it can be further configured that: a lower limit buffer component including a plurality of protrusions with spherical arc-shaped upper surfaces is provided on the second contact surface of the support and fixing component, in the same vertical plane as the upper mounting connecting plate, to limit the guiding component in the vertical direction and buffer the lifting driving component.

[0013] By adopting the above technical solution, when the C-ring support and connection component moves downward, the upper mounting connecting plate located on the third contact surface of the C-ring support and connection component moves downward accordingly, and the lower limit buffer component can prevent the lower end of the upper mounting connecting plate from hitting the support and fixing component and limit the guiding component in the vertical direction.

[0014] In a preferred example, it can be further configured that: an upper buffer limit component is installed at the top of the lower mounting connecting plate to limit the guiding component in the vertical direction and buffer the lifting driving component.

[0015] By adopting the above technical solution, when the C-ring support connection assembly moves upward, the upper buffer limit assembly can prevent the C-ring from moving to a position beyond the expected position.

[0016] In a preferred example, it can be further configured that: the lifting drive assembly includes a motor, a push rod cylinder, and a push rod. The motor is installed on one side close to the support fixing assembly and is fixedly connected to the push rod cylinder through a motor mounting sheet metal part. The push rod is sleeved in the push rod cylinder and is connected to the third contact surface of the C-ring support assembly. The motor drives the push rod to extend and retract, so that the C-ring support connection assembly performs a lifting movement.

[0017] By adopting the above technical solution, the motor drives the push rod to perform a linear motion, realizing the linear displacement control of the C-ring support connection assembly, and the C-ring performs a lifting movement to adapt to the body positions of patients at different heights.

[0018] In a preferred example, it can be further configured that: the lifting drive assembly includes a cylinder and a push rod. The cylinder is located at one end of the lifting drive assembly close to the support fixing assembly. The pneumatic joint of the cylinder is connected to the push rod. The third contact surface of the C-ring support connection assembly is fixedly connected to the push rod. The cylinder drives the push rod to extend and retract, so that the C-ring support connection assembly performs a lifting movement.

[0019] By adopting the above technical solution, the cylinder provides a driving force for the lifting drive assembly, drives the push rod to move, makes the C-ring support connection assembly move, and the C-ring performs a lifting movement to adapt to the body positions of patients at different heights.

[0020] In a preferred example, it can be further configured that: the first guiding component includes a plurality of slide rails. The slide rails are provided with a plurality of mounting holes and are installed on the side of the lower mounting connecting plate close to the lifting drive assembly in cooperation with bolts. The second guiding component includes a plurality of slide rail seats installed below one side of the upper mounting connecting plate. The slide rails are slidably connected to the slide rail seats.

[0021] By adopting the above technical solution, the slide rails and the slide rail seats can slide relative to each other to realize the guiding function. The combination of a plurality of slide rails and slide rail seats improves the structural strength and stability of the entire lifting device.

[0022] In a preferred example, it can be further configured that: the slide rails are all vertically installed on one side of the lower mounting connecting plate, the slide rail seats are all vertically installed on one side of the upper mounting connecting plate, and the slide rails and the slide rail seats are respectively slidably matched to limit the movement of the lifting drive assembly in the vertical direction.

[0023] By adopting the above technical solution, the slide rail and the slide rail seat cooperate with each other. When the lifting drive assembly works, the C-ring support connection assembly drives the C-ring to move up and down. The slide rail and the slide rail seat slide relative to each other in the vertical direction with low friction to guide the up and down movement of the C-ring.

[0024] In a preferred example, it can be further configured that: two identical second support plates are provided at both ends of one side of the upper mounting connecting plate, and the C-ring support connection assembly is connected to the second support plate to enhance the stability when supporting the C-ring.

[0025] By adopting the above technical solution, one right-angled side of the second support plate is connected to the C-ring support connection assembly, and the other adjacent right-angled side is connected to the upper mounting connecting plate. The upper end of the upper mounting connecting plate is connected to the C-ring support connection assembly, and the connection method of the other second support plate is the same as above. By using the high stability of this geometric structure, the support strength of the C-ring support connection assembly is improved.

[0026] In a preferred example, it can be further configured that: two identical first support plates are fixed at both ends of the side of the lower mounting connecting plate where the slide rail is installed, and the support fixing assembly is connected to the first support plate to enhance the stability of the support fixing assembly.

[0027] By adopting the above technical solution, one right-angled side of the first support plate is connected to the support fixing assembly, and the other adjacent right-angled side is connected to the lower mounting connecting plate. The lower end of the lower mounting connecting plate is connected to the support fixing assembly, and the connection method of the other first support plate is the same as above. By using the high stability of this geometric structure, the support strength of the support fixing assembly for the entire lifting device is improved.

[0028] In a preferred example, it can be further configured that: the upper mounting connecting plate and the lower mounting connecting plate are parallel to each other.

[0029] By adopting the above technical solution, the second guiding component on the upper mounting connecting plate and the first guiding component on the lower mounting connecting plate are in parallel cooperation. The C-ring support connection assembly maintains a parallel relationship with the support fixing assembly through the geometric connection relationship between the upper mounting connecting plate and the lower mounting connecting plate. The support fixing assembly is fixed to the main body of the CT machine equipment and remains horizontal. Through the parallel relationship, the C-ring support connection assembly remains horizontal.

[0030] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0031] 1. By the driving force provided by the lifting drive assembly, the C-ring can adjust its own height according to the body position height of different patients, expanding the applicable range of scanning and being easy to operate;

[0032] 2. Reduce the risk of equipment damage: Equipped with a buffer component to reduce the impact risk and lower the equipment damage and failure rate;

[0033] 3. Through the cooperation of the slide rail and the slide rail seat, ensure the vertical movement direction of the C-ring during the lifting process and prevent horizontal offset;

[0034] 4. High stability: Both the support and fixing component and the C-ring support and connection component are provided with support plates, forming a stable geometric structure. Description of the Drawings

[0035] Figure 1 is a side view of the overall structure of the lifting device of a mobile CT machine according to an embodiment of the present invention;

[0036] Figure 2 is Figure 1 a three-dimensional view of the overall structure of the lifting device of the mobile CT machine;

[0037] Figure 3 is Figure 1 an isometric view of the lifting device of the mobile CT machine;

[0038] Figure 4 is Figure 1 an exploded view of the lifting device of the mobile CT machine.

[0039] Description of the reference numerals: 10, support and fixing component; 20, lower limit buffer component; 21, spherical arc-shaped protrusion; 30, lifting drive component; 31, lower sheet metal part; 32, connecting buckle; 33, motor mounting sheet metal part; 34, motor; 35, push rod cylinder; 36, push rod; 37, upper sheet metal part; 40, guiding component; 41, first guiding part; 42, second guiding part; 50, upper buffer limit component; 60, C-ring support and connection component; 70, lower mounting connecting plate; 80, upper mounting connecting plate; 91, first support plate; 92, second support plate. Detailed Description of the Embodiment

[0040] The following Figures 1 to 4 further describes the present invention in detail with reference to the attached

[0041] Refer to Figure 1 and Figure 4 , an embodiment of the present invention discloses a lifting device of a mobile CT machine, which includes: a support and fixing component 10, a guiding component 40, a lifting drive component 30 and a C-ring support and connection component 60. The support and fixing component 10 has a first contact surface for connecting the main body of the mobile CT machine equipment (such as Figure 1 the lower surface of the support and fixing component 10 shown), and the support and fixing component 10 has a second contact surface relative to the first contact surface (such as Figure 1the upper surface of the shown support and fixing assembly 10), a lower mounting connecting plate 70 is provided on the second contact surface. The guiding assembly 40 includes a first guiding member 41 fixedly connected to one side of the lower mounting connecting plate 70 and a second guiding member 42 configured to move up and down in the guiding direction of the first guiding member 41 (as Figure 2 shown). The lifting drive assembly 30 can move up and down based on the guiding of the guiding assembly 40, and the lower end of the lifting drive assembly 30 is connected to the support and fixing assembly 10. The C-ring support and connection assembly 60 is connected to the upper end of the lifting drive assembly 30. The C-ring support and connection assembly 60 has a third contact surface (such as the lower surface of the C-ring support and connection assembly 60 shown in Figure 1 ), and a fourth contact surface for connecting the C-ring (such as the upper surface of the ring support and connection assembly 60 shown in Figure 1 ). A longitudinally extending upper mounting connecting plate 80 is provided on the third contact surface of the C-ring support and connection assembly 60, and the second guiding member 42 is fixedly connected to the upper mounting connecting plate 80.

[0042] In the lifting device of this embodiment, the C-ring is separated from the equipment main body of the mobile CT machine, and a lifting device of a mobile CT machine as described above is installed between the two. Refer to Figure 2 , the fixing assembly 10 is connected and supported on the equipment main body, the C-ring is installed on the C-ring support and connection assembly 60. When the lifting drive assembly 30 provides an upward thrust to the C-ring support and connection assembly 60, the C-ring support and connection assembly 60 moves upward, and the C-ring moves upward together; when the lifting drive assembly 30 provides a downward force to the C-ring support and connection assembly 60, the C-ring support and connection assembly 60 moves downward, and the C-ring moves downward together. The guiding assembly 40 restricts the movement of the C-ring support and connection assembly 60 in the vertical direction, preventing the C-ring support and connection assembly 60 from generating horizontal movement due to uneven force, and changing the height of the C-ring through lifting movement to adapt to the body position height of different patients.

[0043] Refer to Figure 3 , a lower limit buffer assembly 20 is provided on the second contact surface of the support and fixing assembly 10, specifically including a plurality of protrusions 21 with spherical arc-shaped upper surfaces. The installation positions of the spherical arc-shaped protrusions 21 are in the same vertical plane as the upper mounting connecting plate 80 (as shown in Figure 1 and Figure 2 ), and play a role in vertically limiting the first guiding member 41 of the guiding assembly 40 at the lower limit position of lifting (as shown in Figure 3As shown in the figure), and it plays a buffering role for the lifting drive assembly 30. When the C-ring support connection assembly 30 moves downward, the upper mounting connecting plate 80 located on the third contact surface of the C-ring support connection assembly 30 also moves downward. The lower limit buffering assembly 20 can prevent the lower end of the upper mounting connecting plate 80 from directly hitting the support and fixing assembly 10, and limit the second guiding member 42 of the guiding assembly 40 in the vertical direction.

[0044] Refer to Figure 1 and Figure 2 , at the top of the lower mounting connecting plate 70, an upper buffering and limiting assembly 50 is installed, which limits the second guiding member 42 of the guiding assembly 40 in the vertical direction upward and plays a buffering role for the lifting drive assembly 30. When the C-ring support connection assembly 30 moves upward, the upper buffering and limiting assembly 50 can prevent the C-ring from moving to a position higher than the expected rising position. In a specific example, an upper buffering and limiting assembly 50 is located between the upper edges of the two slide rails of the first guiding member 41 to block the upper limiting height in the vertical direction of the two slide rail seats of the second guiding member 42.

[0045] Refer to Figure 4 , the lifting drive assembly 30 includes a lower sheet metal part 31, an upper sheet metal part 37 and a motor mounting sheet metal part 33. Among them, the lower sheet metal part 31 is connected to the support and fixing assembly 10, and the upper sheet metal part 37 is connected to the C-ring support connection assembly 60 to ensure that the lifting drive assembly 30 realizes power transmission. A connecting buckle 32 is installed on the lower sheet metal part 31, which is used to cooperate with a bolt to connect the lower sheet metal part 31 and the motor mounting sheet metal part 33. The motor mounting sheet metal part 33 is used to install the motor 34 and is fixedly connected to a push rod cylinder 35. A push rod 36 is sleeved on the push rod cylinder 35, and the motor 34 is pivotally connected to the push rod 36 to provide power to the push rod 36, so that the push rod 36 can perform lifting movement in the push rod cylinder 35. The push rod 36 is connected to the upper sheet metal part 37 and transmits power to the C-ring support connection assembly 60. When the motor 34 is started, it drives the push rod 36 to perform a linear motion, realizing the linear displacement control of the C-ring support connection assembly 60, and the C-ring can then perform lifting movement.

[0046] Refer to Figure 4 , the first guiding member 41 includes a plurality of slide rails provided with mounting holes. The mounting holes are used to cooperate with bolts to fix the slide rails on the side of the lower mounting connecting plate 70 close to the lifting drive assembly 30. The second guiding member 42 includes a plurality of slide rail seats installed below one side of the upper mounting connecting plate 80. The slide rails are slidably connected to the slide rail seats to realize the guiding function. The slide rails are all vertically installed on one side of the lower mounting connecting plate 70, and the slide rail seats are all vertically installed on one side of the upper mounting connecting plate 80. The combination of a plurality of slide rails and slide rail seats limits the movement of the lifting drive assembly 30 in the vertical direction, improving the structural strength and stability of the entire lifting device.

[0047] Refer to Figure 1And Figure 2 At both ends of one side of the upper mounting connecting plate 80, there are two identical second support plates 92. The C-ring support connection assembly 60 is connected to the second support plate 92 to enhance the stability when supporting the C-ring. At both ends of one side of the lower mounting connecting plate 70 where the slide rail is installed, two identical first support plates 91 are fixed. The support and fixation assembly 10 is connected to the first support plate 91 to enhance the stability of the support and fixation assembly 10. The upper mounting connecting plate 80 and the lower mounting connecting plate 70 are parallel to each other.

[0048] The implementation principle of this embodiment is as follows: When the lifting drive assembly 30 starts to work, the push rod 36 applies a pushing force to the C-ring support connection assembly 60, thereby driving the C-ring to move up and down along the vertical path formed by the slide rail and the slide rail seat. During this process, the slide rail and the slide rail seat slide relative to each other in the vertical direction with low friction to guide the up and down movement of the C-ring. The lower limit buffer assembly 20 and the upper buffer and limit assembly 50 provide necessary buffering and limiting functions to prevent impacts or damages caused by excessive movement.

[0049] One right-angled side of the second support plate 92 (such as Figure 2 the top right-angled side of the second support plate 92 shown) is connected to the C-ring support connection assembly 60, and the other adjacent right-angled side (such as Figure 2 the left right-angled side of the second support plate 92 shown) is connected to the upper mounting connecting plate 80. The upper end of the upper mounting connecting plate 80 is connected to the C-ring support connection assembly 60. The connection method of the other support plate is the same as above. Utilizing the high stability of this geometric structure, the support strength of the C-ring support connection assembly 60 is improved.

[0050] One right-angled side of the first support plate 91 (such as Figure 2 the bottom right-angled side of the first support plate 91 shown) is connected to the support and fixation assembly 10, and the other adjacent right-angled side (such as Figure 2 the left right-angled side of the first support plate 91 shown) is connected to the lower mounting connecting plate 70. The lower end of the lower mounting connecting plate 70 is connected to the support and fixation assembly 10. The connection method of the other first support plate is the same as above. Utilizing the high stability of this geometric structure, the support strength of the support and fixation assembly 10 for the entire lifting device is improved.

[0051] The second guiding component 42 on the upper mounting connecting plate 80 is in parallel cooperation with the first guiding component 41 on the lower mounting connecting plate 70. The C-ring support connection assembly 60 maintains a parallel relationship with the support and fixation assembly 10 through the geometric connection relationship between the upper mounting connecting plate 80 and the lower mounting connecting plate 70. The support and fixation assembly 10 is fixed to the main body of the CT machine equipment and remains horizontal. Through the parallel relationship, the C-ring support connection assembly 60 remains horizontal, ensuring the stability and accuracy during CT scanning.

[0052] The embodiments of this specific implementation manner are all preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A lifting device for a mobile CT machine, characterized in that: include: A support fixing assembly (10) having a first contact surface for connecting to a mobile CT machine device body, wherein a second contact surface of the support fixing assembly (10) opposite to the first contact surface is provided with a lower mounting connection plate (70); A guide assembly (40) comprising a first guide component (41) and a second guide component (42) fixedly connected to one side of the lower mounting connection plate (70); A lifting drive component (30) capable of lifting and lowering movement based on the guidance of the guide component (40), one end of the lifting drive component (30) being connected to the supporting and fixing component (10); A C-ring supporting connection assembly (60) is connected to the other end of the lifting drive assembly (30), the C-ring supporting connection assembly (60) having a third contact surface and a fourth contact surface for connecting the C-ring, the third contact surface of the C-ring supporting connection assembly (60) being provided with an upper mounting connection plate (80), one side of the upper mounting connection plate (80) being fixedly connected to the second guide component (42).

2. The lifting device of the mobile CT machine according to claim 1, characterized in that: The second contact surface of the supporting and fixing assembly (10) is provided with a lower limit buffer assembly (20) including a plurality of protrusions (21) with spherical arc-shaped upper surfaces, which is in the same vertical plane as the upper mounting connecting plate (80), limits the guide assembly (40) in the vertical direction, and acts as a buffer for the lifting drive assembly (30).

3. The lifting device of the mobile CT machine according to claim 1, characterized in that: An upper buffer limit assembly (50) is installed at the top end of the lower mounting connection plate (70) to limit the guide assembly (40) in the vertical direction and to buffer the lifting drive assembly (30).

4. The lifting device of the mobile CT machine according to claim 1, characterized in that: The lifting drive assembly (30) comprises a motor (34), a push rod tube (35) and a push rod (36); the motor is mounted on a side close to the support fixing assembly (10) and is fixedly connected to the push rod tube (35) via a motor mounting sheet metal component (33); the push rod (36) is sleeved on the push rod tube (35) and connected to a third contact surface of the C-ring support assembly; the motor (34) drives the push rod (36) to extend and retract, thereby causing the C-ring support connection assembly (60) to perform lifting and lowering movements.

5. The lifting device of the mobile CT machine according to claim 1, characterized in that: The lifting drive assembly (30) comprises a cylinder and a push rod. The cylinder is located at one end of the lifting drive assembly (30) close to the supporting and fixing assembly (10). The pneumatic joint of the cylinder is connected to the push rod. The third contact surface of the C-ring supporting and connecting assembly (60) is fixedly connected to the push rod. The cylinder drives the push rod to extend and retract, so that the C-ring supporting and connecting assembly (60) performs lifting and lowering movements.

6. The lifting device of the mobile CT machine according to claim 1, characterized in that: The first guide component (41) includes a plurality of slide rails, each of which has a plurality of mounting holes and is mounted on a side of the lower mounting connecting plate (70) close to the lifting drive assembly (30) in cooperation with bolts. The second guide component (42) includes a plurality of slide rail seats mounted below one side of the upper mounting connecting plate (80), and the slide rails are slidably connected to the slide rail seats.

7. The lifting device of the mobile CT machine according to claim 6, characterized in that: The slide rails are vertically mounted on one side of the lower mounting connection plate (70), the slide rail seats are vertically mounted on one side of the upper mounting connection plate (80), and the slide rails and the slide rail seats are respectively slidably matched to restrict the movement of the lifting drive assembly to a vertical direction.

8. The lifting device of the mobile CT machine according to claim 1, characterized in that: Two identical second support plates (92) are provided at both ends of one side of the upper mounting connection plate (80), and the C-ring support connection assembly (60) is connected to the second support plates (92) to enhance stability when supporting the C-ring.

9. The lifting device of the mobile CT machine according to claim 1, characterized in that: Two identical first support plates (91) are fixed at both ends of one side of the lower mounting connection plate (70) mounting the slide rail, and the support fixing assembly (10) is connected to the first support plates (91) to enhance the stability of the support fixing assembly (10).

10. The lifting device of the mobile CT machine according to claim 1, characterized in that: The upper mounting connection plate (80) and the lower mounting connection plate (70) are parallel to each other.

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