Template clamp for limiting geometric dimension of concrete member

Abstract

The invention discloses a formwork clamp for limiting the geometric dimension of a concrete member, and particularly relates to the technical field of concrete construction.The formwork clamp comprises a pair of transverse rods, the front end and the rear end of the transverse rod on the left side are connected with a fourth clamping plate and a first clamping plate correspondingly, and the front end and the rear end of the transverse rod on the right side are connected with a third clamping plate and a second clamping plate correspondingly; the interiors of the fourth clamping plate and the third clamping plate and the interiors of the second clamping plate and the first clamping plate are slidably connected with sliding pipes correspondingly, and sliding mechanisms are arranged in the pair of sliding pipes. The bottom of the second clamping plate is connected with a shell, when the thickness of the template is increased, the ball nut pair moves back to back by rotating the knob, the clamping plates are pushed to expand outwards, and the size of the opening of the clamp is increased; on the contrary, when the thickness of the template is reduced, the ball nut pairs move oppositely, the clamping plates contract inwards, the opening size is reduced, it is ensured that the opening size of the clamp is dynamically matched with the thickness of the template, and the situation that clamping force is insufficient due to too large gaps is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete construction, and particularly relates to a formwork fixture for restricting the geometric dimensions of concrete components. Background Art

[0002] Concrete components refer to building components made of concrete materials with specific shapes and functions. They are the basic units of building structures, featuring high compressive strength and good durability. They are widely used in projects such as buildings, bridges, and roads. In concrete construction, formwork is a temporary support structure for shaping concrete components, equivalent to the "mold" of the components, while the formwork fixture is a key tool for fixing the formwork and ensuring its stability, which is to ensure that the formwork remains stable during the concrete pouring process, preventing deformation, displacement, or bulging of the formwork, so as to ensure that the concrete components meet the shape, size, and accuracy requirements of the design.

[0003] During the use of current formwork fixtures for concrete components, the adaptability is poor. When used in different projects or the same project, such as wooden formwork and steel formwork, fixed-length fixtures cannot adjust the clamping force according to formwork of different thicknesses, which may lead to gaps between the formwork and concrete components. Summary of the Invention

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A formwork fixture for restricting the geometric dimensions of concrete components, comprising:

[0006] A pair of cross bars. The front and rear ends of the left cross bar are respectively connected with a fourth clamping plate and a first clamping plate, and the front and rear ends of the right cross bar are respectively connected with a third clamping plate and a second clamping plate. Inside the fourth clamping plate and the third clamping plate, as well as inside the second clamping plate and the first clamping plate, sliding tubes are slidably connected. Long strip holes are provided on the upper and lower sides of a pair of the sliding tubes, and sliding mechanisms are arranged inside the long strip holes;

[0007] The bottom of the second clamping plate is connected with a housing, and a driving mechanism is arranged inside the housing;

[0008] Lifting tubes are slidably connected to the tops of the fourth clamping plate, the first clamping plate, the third clamping plate, and the second clamping plate. A support mechanism is arranged on the back side of the lifting tubes. Seven second through holes are opened from top to bottom at the ends of the lifting tubes, and a pair of positioning mechanisms are arranged inside the second through holes.

[0009] In a possible implementation, the sliding mechanism includes a second bidirectional lead screw and a first bidirectional lead screw. The two ends of the second bidirectional lead screw are respectively rotatably connected to a first clamping plate and a second clamping plate. The two ends of the first bidirectional lead screw are respectively rotatably connected to a fourth clamping plate and a third clamping plate. A pair of ball nut pairs are connected to the outer sides of the second bidirectional lead screw and the first bidirectional lead screw. A fixed sleeve is fixedly connected to the outer side of the ball nut pair. The upper and lower sides of the fixed sleeve penetrate through the inside of the long slot and are fixedly connected to the upper and lower side walls of the third clamping plate.

[0010] In a possible implementation, a first synchronous pulley is connected to the right end of the first bidirectional lead screw, and a second synchronous pulley is connected to the right end of the second bidirectional lead screw. A synchronous belt is sleeved on the outer sides of the first synchronous pulley and the second synchronous pulley, and a protective cover is sleeved on the outer side of the synchronous belt.

[0011] In a possible implementation, the driving mechanism includes a shaft rod. A second gear is connected to the middle position of the outer side of the shaft rod. Bearing seats are connected to both sides of the second gear on the outer side of the shaft rod. The top of the bearing seat is fixedly connected to the second clamping plate. A first gear is meshed with the outer side of the second gear, and the inner side of the first gear is fixedly connected to the second bidirectional lead screw.

[0012] In a possible implementation, the right end of the shaft rod penetrates through the right side of the housing and is connected to a knob. A plurality of positioning holes are circumferentially formed on the outer side of the knob. A threaded knob penetrates through the inside of the positioning hole. A first through hole is formed in the housing on the lower side of the shaft rod on the right side. A threaded sleeve is connected to the inner wall of the housing near the first through hole. The end of the threaded knob penetrates through the inside of the first through hole and is threadedly connected to the threaded sleeve.

[0013] In a possible implementation, the supporting mechanism includes a back plate. The inner side of the back plate is fixedly connected to a lifting pipe. Four first slots are formed at the bottom of the back plate. A guide frame is slidably connected to the outer side of the back plate. The inner side of the guide frame is fixedly connected to the third clamping plate. Second slots are formed at the upper positions near the left and right sides of the guide frame. A pair of inserting plates are slidably connected to the inside of the second slots. The inserting plates penetrate through the inside of the first slots.

[0014] In a possible implementation, the back plate is in the shape of a right trapezoid.

[0015] In a possible implementation, the positioning mechanism includes a U-shaped frame. Both sides of the U-shaped frame are fixedly connected to the third clamping plate. A pair of fourth through holes are formed on one side of the U-shaped frame. A plug rod penetrates through the interior of the fourth through holes. One end of the plug rod is connected to a pull plate. A fixed ring is connected to the outer side of the plug rod and inside the U-shaped frame. A return spring is sleeved on the outer side of the plug rod. One end of the return spring is fixedly connected to the U-shaped frame, and the other end of the return spring is fixedly connected to the fixed ring.

[0016] In a possible implementation, a pair of third through holes are formed near the top positions on both sides of the third clamping plate. The other end of the plug rod penetrates through the interior of the third through holes.

[0017] In a possible implementation, the distance between a pair of the third through holes is the same as the distance between a pair of the second through holes.

[0018] In the above technical solution, the technical effects and advantages provided by the present invention are as follows:

[0019] 1. By rotating the threaded knob, it is convenient to remove the threaded knob from the knob. Then, it is convenient to rotate the knob, driving the shaft rod and the second gear to rotate, and further driving the first gear and the second bidirectional lead screw to rotate. Through the cooperation among the synchronous belt, the first synchronous pulley, and the second synchronous pulley, it is convenient to drive the first bidirectional lead screw to rotate synchronously, and further convenient to drive a pair of ball nut pairs on their respective outer sides to move towards or away from each other. When the thickness of the template increases, by rotating the knob, the ball nut pairs move away from each other, pushing the clamping plates to expand outwards and increasing the opening size of the fixture; conversely, when the thickness of the template decreases, the ball nut pairs move towards each other, and the clamping plates contract inwards, reducing the opening size, ensuring that the opening size of the fixture is dynamically matched with the thickness of the template, and avoiding situations such as insufficient clamping force caused by too large a gap.

[0020] 2. By pulling the pull plates on both sides of the clamping plate, it is convenient to remove the plug rod from the second through holes at the bottom of the lifting pipe, and then it is convenient to adjust the height of the lifting pipe. When pouring concrete members of different heights, there is no need to replace the entire set of fixtures. Just pull out the plug rod from the current hole position and insert it into the new hole position corresponding to the height, and the support height of the fixture can be quickly adjusted, reducing the equipment investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 One of the side sectional views of the first clamping plate, the second clamping plate, the third clamping plate, and the fourth clamping plate of the present invention;

[0024] Figure 3 For the present invention Figure 2 Exploded view of the sliding tube, the first double - lead screw, and the second double - lead screw in;

[0025] Figure 4 For the present invention Figure 2 Another side sectional view of the first clamping plate, the second clamping plate, the third clamping plate, and the fourth clamping plate of the present invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged view of part A in;

[0027] Figure 6 Exploded view of the third clamping plate and the lifting tube of the present invention;

[0028] Figure 7 For the present invention Figure 6 Exploded view of the U - shaped frame and the third clamping plate in;

[0029] Figure 8 For the present invention Figure 7 Enlarged view of part B in.

[0030] Explanation of reference numerals:

[0031] 1. Lifting tube; 2. First clamping plate; 3. Back plate; 4. Guide frame; 5. Second clamping plate; 6. Knob; 7. Cross bar; 8. Protective cover; 9. Third clamping plate; 10. Fourth clamping plate; 11. First double - lead screw; 12. Second double - lead screw; 13. Synchronous belt; 14. Sliding tube; 15. Long slot; 16. Fixed sleeve; 17. Ball screw nut pair; 18. First synchronous pulley; 19. First gear; 20. Bearing seat; 21. Shaft rod; 22. Outer shell; 23. Second synchronous pulley; 24. Positioning hole; 25. Second gear; 26. Threaded knob; 27. First through - hole; 28. Threaded sleeve; 29. U - shaped frame; 30. Pulling plate; 31. Inserting plate; 32. Second through - hole; 33. First slot; 34. Second slot; 35. Third through - hole; 36. Fixed ring; 37. Inserting rod; 38. Return spring; 39. Fourth through - hole. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0033] The embodiments of the present application provide a formwork fixture for restricting the geometric dimensions of concrete members to solve the problems in the prior art.

[0034] The overall idea of the technical solution in the embodiments of this application to solve the above problems is as follows:

[0035] As Figures 1-8 shown, a formwork fixture for restricting the geometric dimensions of concrete members includes:

[0036] A pair of cross bars 7, with a fourth clamping plate 10 and a first clamping plate 2 respectively connected to the front and rear ends of the left cross bar 7, and a third clamping plate 9 and a second clamping plate 5 respectively connected to the front and rear ends of the right cross bar 7. Inside the fourth clamping plate 10 and the third clamping plate 9, and inside the second clamping plate 5 and the first clamping plate 2, sliding tubes 14 are slidably connected. Longitudinal holes 15 are opened on both the upper and lower sides of the pair of sliding tubes 14, and a sliding mechanism is arranged inside the longitudinal holes 15;

[0037] The bottom of the second clamping plate 5 is connected with a housing 22, and a driving mechanism is arranged inside the housing 22;

[0038] Lifting tubes 1 are slidably connected to the tops of the fourth clamping plate 10, the first clamping plate 2, the third clamping plate 9 and the second clamping plate 5. A supporting mechanism is arranged on the back side of the lifting tubes 1. Seven second through holes 32 are opened from top to bottom at the ends of the lifting tubes 1, and a pair of positioning mechanisms are arranged inside the second through holes 32.

[0039] In some examples, the sliding mechanism includes a second bidirectional lead screw 12 and a first bidirectional lead screw 11. The two ends of the second bidirectional lead screw 12 are respectively rotatably connected to the first clamping plate 2 and the second clamping plate 5, and the two ends of the first bidirectional lead screw 11 are respectively rotatably connected to the fourth clamping plate 10 and the third clamping plate 9. A pair of ball nut pairs 17 are connected to the outer sides of the second bidirectional lead screw 12 and the first bidirectional lead screw 11. A fixed sleeve 16 is fixedly connected to the outer side of the ball nut pair 17. The upper and lower sides of the fixed sleeve 16 penetrate through the inside of the longitudinal hole 15 and are fixedly connected to the upper and lower side walls of the third clamping plate 9. Rotating the knob 6 drives the shaft rod 21 and the second gear 25 to rotate, and then drives the first gear 19 and the second bidirectional lead screw 12 to rotate. Through the cooperation among the synchronous belt 13, the first synchronous pulley 18 and the second synchronous pulley 23, it is convenient to drive the first bidirectional lead screw 11 to rotate synchronously, and further convenient to drive the pair of ball nut pairs 17 on their respective outer sides to move towards or away from each other. When the thickness of the formwork increases, by rotating the knob 6, the ball nut pairs 17 move away from each other, pushing the clamping plates to expand outwards and increasing the opening size of the fixture; conversely, when the thickness of the formwork decreases, the ball nut pairs 17 move towards each other, the clamping plates contract inwards, and the opening size is reduced, ensuring that the opening size of the fixture is dynamically matched with the thickness of the formwork and avoiding situations such as insufficient clamping force caused by too large a gap.

[0040] In some examples, a first synchronous pulley 18 is connected to the right end of the first double - lead screw 11, and a second synchronous pulley 23 is connected to the right end of the second double - lead screw 12. A synchronous belt 13 is sleeved outside the first synchronous pulley 18 and the second synchronous pulley 23, and a protective cover 8 is sleeved outside the synchronous belt 13. While the second double - lead screw 12 rotates, through the cooperation among the synchronous belt 13, the first synchronous pulley 18 and the second synchronous pulley 23, it is convenient to drive the first double - lead screw 11 to rotate synchronously.

[0041] In some examples, the driving mechanism includes a shaft rod 21. A second gear 25 is connected to the middle position on the outside of the shaft rod 21. Bearing seats 20 are connected to both sides of the second gear 25 on the outside of the shaft rod 21. The top of the bearing seat 20 is fixedly connected to the second clamping plate 5. A first gear 19 is meshed and connected to the outside of the second gear 25. The inside of the first gear 19 is fixedly connected to the second double - lead screw 12. Rotating the knob 6 drives the shaft rod 21 and the second gear 25 to rotate, and further drives the first gear 19 and the second double - lead screw 12 to rotate.

[0042] In some examples, the right end of the shaft rod 21 extends to the right side of the outer shell 22 and is connected to a knob 6. A number of positioning holes 24 are circumferentially formed on the outside of the knob 6. A threaded knob 26 is connected through the inside of the positioning hole 24. A first through - hole 27 is formed below the shaft rod 21 on the right side of the outer shell 22. A threaded sleeve 28 is connected to the inner wall of the outer shell 22 near the first through - hole 27. The end of the threaded knob 26 passes through the inside of the first through - hole 27 and is threadedly connected to the threaded sleeve 28. By rotating the threaded knob 26, it is convenient to remove the threaded knob 26 from the threaded sleeve 28 and the knob 6, and then it is convenient to rotate the knob 6. On the contrary, rotating the threaded knob 26 inserts the threaded knob 26 into the knob 6 and is threadedly connected to the threaded sleeve 28, which is convenient to complete the fixation of the knob 6.

[0043] In some examples, the support mechanism includes a back plate 3. The inside of the back plate 3 is fixedly connected to the lifting tube 1. Four first slots 33 are formed at the bottom of the back plate 3. A guide frame 4 is slidably connected to the outside of the back plate 3. The inside of the guide frame 4 is fixedly connected to the third clamping plate 9. Second slots 34 are formed at the top positions near the left and right sides of the guide frame 4. An insertion plate 31 is slidably connected to the inside of a pair of second slots 34. The insertion plate 31 passes through the inside of the first slots 33. Through the connection between the back plate 3 and the guide frame 4, it is beneficial to improve the stability of the lifting tube 1 and ensure that the fixture will not be misaligned due to lateral pressure when clamping the template.

[0044] In some examples, the back plate 3 is set in the shape of a right - angled trapezoid.

[0045] In some examples, the positioning mechanism includes a U-shaped frame 29. Both sides of the U-shaped frame 29 are fixedly connected to the third clamping plate 9. A pair of fourth through holes 39 are provided on one side of the U-shaped frame 29. A plug rod 37 is connected through the interior of the fourth through hole 39. One end of the plug rod 37 is connected to a pull plate 30. A fixing ring 36 is connected to the outer side of the plug rod 37 and inside the U-shaped frame 29. A return spring 38 is sleeved on the outer side of the plug rod 37. One end of the return spring 38 is fixedly connected to the U-shaped frame 29, and the other end of the return spring 38 is fixedly connected to the fixing ring 36. By pulling the pull plates 30 on both sides of the clamping plate, it is convenient to take out the plug rod 37 from the second through hole 32 at the bottom of the lifting pipe 1, and then it is convenient to adjust the height of the lifting pipe 1. When pouring concrete members of different heights, there is no need to replace the whole set of fixtures. Just pull out the plug rod 37 from the current hole position and insert it into a new hole position corresponding to the height, and the support height of the fixture can be quickly adjusted, reducing the equipment input cost.

[0046] In some examples, a pair of third through holes 35 are provided near the top positions on both sides of the third clamping plate 9. The other end of the plug rod 37 penetrates through the interior of the third through hole 35. When the other end of the plug rod 37 is inserted into the interior of the third through hole 35, it is convenient to complete the fixation of the height of the lifting pipe 1. On the contrary, the height of the lifting pipe 1 can be adjusted.

[0047] In some examples, the distance between a pair of third through holes 35 is the same as the distance between a pair of second through holes 32, which is beneficial to conveniently insert the upper and lower pair of plug rods 37 into the interior of the pair of second through holes 32.

[0048] In the present invention, by rotating the threaded knob 26, it is convenient to remove the threaded knob 26 from the knob 6. Then it is convenient to rotate the knob 6, driving the shaft rod 21 and the second gear 25 to rotate, and further driving the first gear 19 and the second double lead screw 12 to rotate. Through the cooperation among the synchronous belt 13, the first synchronous pulley 18 and the second synchronous pulley 23, it is convenient to drive the first double lead screw 11 to rotate synchronously, and further convenient to drive the pair of ball nut pairs 17 on their respective outer sides to move towards or away from each other. When the thickness of the formwork increases, by rotating the knob 6, the ball nut pairs 17 move away from each other, pushing the clamping plates to expand outwards and increasing the opening size of the fixture; on the contrary, when the thickness of the formwork decreases, the ball nut pairs 17 move towards each other, and the clamping plates contract inwards, reducing the opening size, ensuring that the opening size of the fixture dynamically matches the thickness of the formwork, and avoiding situations such as insufficient clamping force caused by too large a gap. By pulling the pull plates 30 on both sides of the clamping plate, it is convenient to take out the plug rod 37 from the second through hole 32 at the bottom of the lifting pipe 1, and then it is convenient to adjust the height of the lifting pipe 1. When pouring concrete members of different heights, there is no need to replace the whole set of fixtures. Just pull out the plug rod 37 from the current hole position and insert it into a new hole position corresponding to the height, and the support height of the fixture can be quickly adjusted, reducing the equipment input cost.

[0049] Only some exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of the claims of the present invention.

Claims

1. A formwork fixture for restricting the geometric dimensions of concrete components, characterized in that Comprising: A pair of cross bars (7), the front and rear ends of the left cross bar (7) are respectively connected with a fourth clamping plate (10) and a first clamping plate (2), the front and rear ends of the right cross bar (7) are respectively connected with a third clamping plate (9) and a second clamping plate (5), sliding tubes (14) are slidably connected inside the fourth clamping plate (10) and the third clamping plate (9), and inside the second clamping plate (5) and the first clamping plate (2). Long strip holes (15) are opened on the upper and lower sides of the pair of sliding tubes (14), and a sliding mechanism is arranged inside the long strip holes (15); The bottom of the second clamping plate (5) is connected with a housing (22), and a driving mechanism is arranged inside the housing (22); Lifting tubes (1) are slidably connected to the tops of the fourth clamping plate (10), the first clamping plate (2), the third clamping plate (9) and the second clamping plate (5). A supporting mechanism is arranged on the back side of the lifting tube (1). Seven second through holes (32) are opened from top to bottom at the end of the lifting tube (1), and a pair of positioning mechanisms are arranged inside the second through holes (32).

2. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 1, characterized in that: The sliding mechanism includes a second bidirectional lead screw (12) and a first bidirectional lead screw (11). The two ends of the second bidirectional lead screw (12) are respectively rotatably connected with the first clamping plate (2) and the second clamping plate (5). The two ends of the first bidirectional lead screw (11) are respectively rotatably connected with the fourth clamping plate (10) and the third clamping plate (9). A pair of ball nut pairs (17) are connected to the outer sides of the second bidirectional lead screw (12) and the first bidirectional lead screw (11). The outer sides of the ball nut pairs (17) are fixedly connected with fixing sleeves (16). The upper and lower sides of the fixing sleeves (16) penetrate through the inside of the long strip holes (15) and are fixedly connected with the upper and lower side walls of the third clamping plate (9).

3. The formwork fixture for restricting the geometric dimensions of concrete members according to claim 2, characterized in that: The right end of the first bidirectional lead screw (11) is connected with a first synchronous pulley (18), the right end of the second bidirectional lead screw (12) is connected with a second synchronous pulley (23). A synchronous belt (13) is sleeved on the outer sides of the first synchronous pulley (18) and the second synchronous pulley (23), and a protective cover (8) is sleeved on the outer side of the synchronous belt (13).

4. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 1, characterized in that: The driving mechanism includes a shaft rod (21). The middle position of the outer side of the shaft rod (21) is connected with a second gear (25). Bearing seats (20) are connected to the outer side of the shaft rod (21) on both sides of the second gear (25). The tops of the bearing seats (20) are fixedly connected with the second clamping plate (5). The outer side of the second gear (25) is meshed with a first gear (19), and the inner side of the first gear (19) is fixedly connected with the second bidirectional lead screw (12).

5. The template fixture for restricting the geometric dimensions of concrete members according to claim 4, characterized in that: The right end of the shaft rod (21) is provided on the right side of the outer shell (22) and is connected to a knob (6). A plurality of positioning holes (24) are circumferentially formed on the outer side of the knob (6). A threaded knob (26) is connected through the positioning holes (24). A first through hole (27) is formed below the shaft rod (21) on the right side of the outer shell (22). A threaded sleeve (28) is connected to the inner wall of the outer shell (22) near the first through hole (27). The end of the threaded knob (26) penetrates through the first through hole (27) and is threadedly connected to the threaded sleeve (28).

6. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 1, characterized in that: The support mechanism includes a back plate (3). The inner side of the back plate (3) is fixedly connected to the lifting pipe (1). Four first slots (33) are formed at the bottom of the back plate (3). A guide frame (4) is slidably connected to the outer side of the back plate (3). The inner side of the guide frame (4) is fixedly connected to a third clamping plate (9). Second slots (34) are formed at the top positions on the left and right sides of the guide frame (4). A plug plate (31) is slidably connected inside a pair of the second slots (34). The plug plate (31) penetrates through the first slots (33).

7. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 6, characterized in that: The back plate (3) is in the shape of a right trapezoid.

8. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 1, characterized in that: The positioning mechanism includes a U-shaped frame (29). Both sides of the U-shaped frame (29) are fixedly connected to the third clamping plate (9). A pair of fourth through holes (39) are formed on one side of the U-shaped frame (29). A plug rod (37) is connected through the fourth through holes (39). One end of the plug rod (37) is connected to a pull plate (30). A fixing ring (36) is connected to the outer side of the plug rod (37) inside the U-shaped frame (29). A return spring (38) is sleeved on the outer side of the plug rod (37). One end of the return spring (38) is fixedly connected to the U-shaped frame (29). The other end of the return spring (38) is fixedly connected to the fixing ring (36).

9. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 8, characterized in that: A pair of third through holes (35) are formed at the top positions on both sides of the third clamping plate (9). The other end of the plug rod (37) penetrates through the third through holes (35).

10. A formwork fixture for restricting the geometric dimensions of concrete members according to claim 9, characterized in that: The distance between a pair of the third through holes (35) is the same as the distance between a pair of the second through holes (32).

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