A building frame structure with good earthquake resistance

Abstract

The present invention discloses a building frame structure with good earthquake resistance effect, which relates to the technical field of building frame earthquake resistance. It includes two support columns, and a frame beam is fixedly connected to the tops of the two support columns. A platform plate is fixedly connected to one side of the frame beam. Through the setting of the support mechanism of the present invention, after the support frame is installed, the ratchet wrench is put on the hexagonal cap, and the ratchet wrench is used to rotate the hexagonal cap, the rotating shaft and the driving bevel gear to rotate. The rotation of the driving bevel gear drives the rotating threaded rod to rotate through the driven bevel gear. The rotation of the threaded rod drives the sliding rod to move. The movement of the sliding rod squeezes the telescopic spring to compress and undergo elastic deformation. The platform plate is supported by the extrusion force when the telescopic spring is compressed, and then the sliding plate is fixed, realizing that the staff can install the support frame of the platform plate indoors, so that the staff does not need to perform high-altitude operations, and thus can ensure the personal safety of the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of seismic resistance of building frames, and particularly to a building frame structure with good seismic resistance effect. Background Art

[0002] For the seismic foundation of traditional buildings, most of them only rely on load-bearing columns and load-bearing walls for load-bearing, and there are no good auxiliary seismic components between the floors, and even no building reinforcement system is set up. These houses simply cannot withstand the attack of seismic shear waves and longitudinal waves. In an earthquake, these houses are extremely prone to collapse, posing a great threat to people's lives and property safety. The flying platforms of most houses lack support and have poor seismic resistance effect.

[0003] Chinese Patent with publication number CN213709857U discloses a building frame structure with good seismic resistance effect, including a foundation; a reinforced concrete layer is laid on the top of the foundation; an anti-seismic seat is fixedly installed on the top of the reinforced concrete layer; four anti-seismic connecting rods are installed in a circular arrangement on the anti-seismic seat through a rotating shaft; a composite anti-seismic layer is arranged on the top of the anti-seismic seat; a protective sleeve is fixedly installed on the outside of the composite anti-seismic layer; an anti-seismic support seat is embedded and installed on the top of the composite anti-seismic layer, and anti-seismic devices are arranged in a circular arrangement on the outside of the anti-seismic support seat through a rotating shaft, and the bottom of the anti-seismic device is connected to the anti-seismic connecting rod through bolts and nuts.

[0004] However, the above invention has the following deficiencies: During the installation process of the support frame of the flying platform of the existing building frame, since the flying platform is located outdoors of the building, it requires workers to work at high altitude, which not only increases the operation difficulty of installing the support rod, but also cannot guarantee the personal safety of the workers. Summary of the Invention

[0005] The purpose of the present invention is to provide a building frame structure with good seismic resistance effect to solve the problems raised in the above background art.

[0006] The technical solution of the present invention is: A building frame structure with good seismic resistance effect includes two support columns, a frame beam is fixedly connected to the tops of the two support columns together, a platform plate is fixedly connected to one side of the frame beam, and further includes;

[0007] Two support pipes, both of the two support pipes are arranged below the platform plate;

[0008] A support mechanism, the support mechanism is located on the support pipe, and the support mechanism is used to support the platform plate;

[0009] The support mechanism includes sliding rods slidably connected to both ends of the two support tubes. One end of each of the four sliding rods is provided with a sliding groove, and a movable column is slidably connected in each of the four sliding grooves. One end of each of the four movable columns is fixedly connected to a U-shaped block. A telescopic spring is sleeved on each of the four movable columns, and two ends of the telescopic spring are respectively fixedly connected to the U-shaped block and the movable column. Two partition plates are fixedly connected to the inner wall of the support tube. A rotation hole is provided on one side of each of the two partition plates, and a threaded rod is rotatably connected in each of the two rotation holes. The two sliding rods are respectively screwed onto the two threaded rods. One end of the two threaded rods close to each other is key-connected with a driven bevel gear. An activity hole is provided on one side inner wall of the support tube, and a rotating shaft is rotatably connected in the activity hole. One end of the rotating shaft is key-connected with a driving bevel gear. The two driven bevel gears are both engaged with the driving bevel gear. One end of each of the two rotating shafts is fixedly connected with a hexagonal cap.

[0010] Preferably, support bars are embedded at the bottom of the platform plate. Fixed columns are fixedly connected to both ends of the support bars. Two of the U-shaped blocks are respectively rotatably sleeved on the two fixed columns. A sliding plate is provided on one side of each of the two support columns. Fixed blocks are fixedly connected to one side of each of the two sliding plates. The other two U-shaped blocks are respectively rotatably sleeved on the two fixed blocks.

[0011] Preferably, a set of expansion bolts are fixedly connected to both sides of the two support columns. A U-shaped plate is sleeved on each two sets of the expansion bolts. Two slide rails are fixedly connected to one side of each of the two U-shaped plates. The two sliding plates are respectively slidably sleeved on the four slide rails. A nut is screwed on each of the expansion bolts.

[0012] Preferably, the shape of the width cross-section of the support bar is "T-shaped", and the top of the support bar is located inside the platform plate.

[0013] Preferably, fixed rails are fixedly connected to one side of the two support tubes. Slide blocks are slidably connected to the two fixed rails. Limit clamping blocks are fixedly connected to one side of each of the two slide blocks. Ring gear blocks are fixedly sleeved on the cylindrical outer walls of the two rotating shafts. The two ring gear blocks are respectively engaged with the two limit clamping blocks.

[0014] Preferably, movable rods are fixedly connected to one side of the two slide blocks away from the limit clamping blocks. One end of each of the two movable rods is slidably sleeved with an L-shaped rod. The bottom ends of the two L-shaped rods are respectively fixedly connected to the top ends of the two fixed rails. A return spring is sleeved on each of the two movable rods. Two ends of the return spring are respectively fixedly connected to the L-shaped rod and the slide block.

[0015] Preferably, arc-shaped pieces are fixedly connected to one side of each of the two limit blocks, and the two arc-shaped pieces are respectively adapted to the two hexagonal caps.

[0016] Preferably, installation grooves are formed in the tops of the two sliding plates, T-shaped rotating rods are rotatably connected in the two installation grooves, card strips are fixedly connected to one side of each of the two U-shaped plates, card slots are formed in one side of each of the two card strips, and the top ends of the two T-shaped rotating rods respectively penetrate through two of the card slots and are screwed with installation caps.

[0017] Preferably, limiting strips are fixedly connected to the inner walls of the two installation grooves, and the two limiting strips are respectively adapted to the two T-shaped rotating rods.

[0018] The present invention provides a building frame structure with good earthquake resistance through improvement. Compared with the prior art, it has the following improvements and advantages:

[0019] First: Through the setting of the support mechanism of the present invention, after the support frame is installed, the ratchet wrench is put on the hexagonal cap, and the hexagonal cap is rotated by using the ratchet wrench to drive the rotation. The rotation of the hexagonal cap drives the rotation shaft and the driving bevel gear to rotate. The rotation of the driving bevel gear drives the driven bevel gear to rotate. The rotation of the driven bevel gear drives the rotating threaded rod to rotate. The rotation of the threaded rod drives the sliding rod to move, so that the two sliding rods move away from each other. The movement of the sliding rod compresses the telescopic spring and causes elastic deformation. The squeezing force when the telescopic spring is compressed is used to support the platform plate, and then the sliding plate is fixed. It realizes that the staff can install the support frame of the platform plate indoors, so that the staff does not need to perform high-altitude operations, and thus can ensure the personal safety of the staff.

[0020] Second: Before the ratchet wrench of the present invention is put on the hexagonal cap, it will squeeze the arc-shaped piece to move. The movement of the arc-shaped piece drives the limit block to move, so that the limit block moves away from the ring gear block. When the ratchet wrench is removed, the return spring drives the sliding block to reset and the limit block and the arc-shaped piece to reset, so that the limit block contacts and meshes with the ring gear block, realizing that the rotation shaft will not loosen.

[0021] Third: The installation cap is lifted by hand to drive the T-shaped rotating rod to rotate, so that the T-shaped rotating rod enters one of the card slots on the card strip. The installation cap is rotated and moves downward along the vertical rod of the T-shaped rotating rod until the installation cap contacts the card strip, thereby being able to fix the sliding plate. It realizes that the staff can install the support frame of the platform plate indoors, so that the staff does not need to perform high-altitude operations, and thus can ensure the personal safety of the staff. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure in the present invention;

[0024] Figure 2 It is a schematic diagram of the overall three-dimensional structure from another perspective in the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the support mechanism in the present invention;

[0026] Figure 4 It is a schematic diagram of the sectional three-dimensional structure of the support mechanism in the present invention;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the cooperation between the limit block and the ring gear block in the present invention;

[0028] Figure 6 It is a schematic diagram of the sectional structure of the cooperation between the support bar and the platform plate in the present invention;

[0029] Figure 7 It is a schematic diagram of the three-dimensional structure of the cooperation between the T-shaped rotating rod and the clamping bar in the present invention;

[0030] Figure 8 In the present invention Figure 3 The enlarged structure schematic diagram at position A.

[0031] Reference numerals:

[0032] 1, support column; 101, frame beam; 102, platform plate; 103, U-shaped plate; 104, slide rail; 105, sliding plate; 106, fixed block; 107, expansion bolt; 108, nut; 109, support bar; 110, fixed column; 2, support tube; 201, sliding rod; 202, movable column; 203, U-shaped block; 204, telescopic spring; 205, partition board; 206, threaded rod; 207, driven bevel gear; 208, driving bevel gear; 209, rotating shaft; 210, hexagon cap; 3, fixed rail; 301, sliding block; 302, limit block; 303, ring gear block; 304, arc-shaped piece; 305, movable rod; 306, L-shaped rod; 307, return spring; 4, installation groove; 401, T-shaped rotating rod; 402, installation cap; 403, clamping bar; 404, limit bar. Specific embodiments

[0033] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] The present invention provides a building frame structure with good earthquake resistance through improvement. The technical solution of the present invention is as follows:

[0035] As Figures 1 to 8 shown, the embodiment of the present invention provides a building frame structure with good earthquake resistance, including two support columns 1. The tops of the two support columns 1 are fixedly connected together with a frame beam 101. One side of the frame beam 101 is fixedly connected with a platform plate 102, and further includes;

[0036] Two support pipes 2, and both of the two support pipes 2 are arranged below the platform plate 102;

[0037] A support mechanism, the support mechanism is located on the support pipe 2, and the support mechanism is used to support the platform plate 102;

[0038] The support mechanism includes sliding rods 201 slidably connected to both ends of the two support pipes 2. One ends of the four sliding rods 201 are all provided with sliding grooves. Movable columns 202 are all slidably connected in the four sliding grooves. One ends of the four movable columns 202 are all fixedly connected with U-shaped blocks 203. Telescopic springs 204 are all sleeved on the four movable columns 202. Two ends of the telescopic springs 204 are respectively fixedly connected with the U-shaped blocks 203 and the movable columns 202. Two partition plates 205 are fixedly connected to the inner wall of the support pipe 2. Rotation holes are all opened on one sides of the two partition plates 205. Threaded rods 206 are all rotatably connected in the two rotation holes. The two sliding rods 201 are respectively screwed on the two threaded rods 206. Driven bevel gears 207 are all key-connected to one ends of the two threaded rods 206 close to each other. An activity hole is opened on one side inner wall of the support pipe 2. A rotating shaft 209 is rotatably connected in the activity hole. A driving bevel gear 208 is key-connected to one end of the rotating shaft 209. The two driven bevel gears 207 are all meshed with the driving bevel gear 208. Hexagonal caps 210 are all fixedly connected to one ends of the two rotating shafts 209; Through the setting of the support mechanism, after the support frame is installed, the rotating shaft 209 is rotated by using a ratchet wrench, so that the telescopic spring 204 is in a state. Through the mutual cooperation of the support pipe 2, the sliding rod 201, the movable column 202, the U-shaped block 203 and the telescopic spring 204, it is realized that after being shock-absorbed by the telescopic spring 204, the platform plate 102 can be timely extruded for reset, improving the earthquake resistance effect on the platform plate 102.

[0039] Furthermore, support bars 109 are embedded at the bottom of the platform plate 102. Fixed columns 110 are fixedly connected to both ends of the support bars 109. Two of the U-shaped blocks 203 are respectively rotatably sleeved on the two fixed columns 110. Slide plates 105 are provided on one side of the two support columns 1. Fixed blocks 106 are fixedly connected to one side of the two slide plates 105. The other two U-shaped blocks 203 are respectively rotatably sleeved on the two fixed blocks 106. Through the setting of the fixed columns 110, one end of the support frame is sleeved on the fixed column 110, realizing the support of the platform plate 102 by supporting the support bar 109.

[0040] Furthermore, a set of expansion bolts 107 are fixedly connected to both sides of the two support columns 1. U-shaped plates 103 are jointly sleeved on every two sets of expansion bolts 107. Two slide rails 104 are fixedly connected to one side of the two U-shaped plates 103. The two slide plates 105 are respectively slidably sleeved on the four slide rails 104. Nuts 108 are screwed on each of the expansion bolts 107. Through the setting of the expansion bolts 107 and their cooperation with the nuts 108, the fixation of the U-shaped plates 103 is realized.

[0041] Furthermore, the shape of the width cross-section of the support bar 109 is in a "T" shape, and the top of the support bar 109 is located inside the platform plate 102. Through the setting of the support bar 109, with a "T" shaped cross-section, the contact area between the support bar 109 and the platform plate 102 can be increased, realizing better support for the platform plate 102.

[0042] Furthermore, fixed rails 3 are fixedly connected to one side of the two support pipes 2. Slide blocks 301 are slidably connected to the two fixed rails 3. Limit blocks 302 are fixedly connected to one side of the two slide blocks 301. Ring gear blocks 303 are fixedly sleeved on the outer cylindrical walls of the two rotating shafts 209. The two ring gear blocks 303 are respectively engaged with the two limit blocks 302. Through the setting of the limit blocks 302, when the limit blocks 302 are in contact with the ring gear blocks 303, they are in an engaged state, realizing the fixation of the rotating shaft 209 and preventing the rotating shaft 209 from loosening.

[0043] Furthermore, movable rods 305 are fixedly connected to the sides of the two slide blocks 301 away from the limit blocks 302. L-shaped rods 306 are respectively slidably sleeved on one end of the two movable rods 305. The bottom ends of the two L-shaped rods 306 are respectively fixedly connected to the tops of the two fixed rails 3. Return springs 307 are sleeved on the two movable rods 305. The two ends of the return springs 307 are respectively fixedly connected to the L-shaped rods 306 and the slide blocks 301. Through the setting of the return springs 307, when no external force is applied, the return springs 307 can squeeze the slide blocks 301 to press the limit blocks 302 against the ring gear blocks 303.

[0044] Further, arc-shaped pieces 304 are fixedly connected to one side of each of the two limit blocks 302, and the two arc-shaped pieces 304 are respectively adapted to the two hexagonal caps 210; through the arrangement of the arc-shaped pieces 304, when the ratchet handle is put on the hexagonal cap 210, the arc-shaped pieces 304 will be squeezed to move, realizing that the ratchet handle drives the limit block 302 away from the ring gear block 303 through the arc-shaped pieces 304.

[0045] Further, mounting grooves 4 are formed in the tops of the two sliding plates 105, T-shaped rotating rods 401 are rotatably connected in the two mounting grooves 4, clamping bars 403 are fixedly connected to one side of each of the two U-shaped plates 103, clamping grooves are formed in one side of each of the two clamping bars 403, the top ends of the two T-shaped rotating rods 401 respectively penetrate through two of the clamping grooves and are screwed with mounting caps 402; through the arrangement of the T-shaped rotating rods 401, when the T-shaped rotating rod 401 enters one of the clamping grooves on the clamping bar 403 and the mounting cap 402 is tightened, the fixing of the sliding plate 105 is realized.

[0046] Further, limiting strips 404 are fixedly connected to the inner walls of the two mounting grooves 4, and the two limiting strips 404 are respectively adapted to the two T-shaped rotating rods 401; through the arrangement of the limiting strips 404, the T-shaped rotating rods 401 can be limited, preventing the T-shaped rotating rods 401 from rotating too much, so that the T-shaped rotating rods 401 will not contact the U-shaped blocks 203.

[0047] Specific implementation steps: First, the staff fixes the U-shaped plate 103 at a predetermined position on the support column 1 through expansion bolts 107 and nuts 108, slides the sliding plate 105 onto the slide rail 104, holds the support tube 2 and rotates it with the fixed block 106 as the center of the circle, so that one of the U-shaped blocks 203 rotates to the position of one of the fixed columns 110, aligns the jack on one of the U-shaped blocks 203 with the fixed column 110, and pushes the support tube 2 to drive the sliding rod 201, the movable column 202, the fixed block 106, the U-shaped block 203 and the sliding plate 105 to move until the sliding plate 105 is sleeved on the fixed column 110. Use a ratchet wrench to squeeze the arc-shaped piece 304 to move. The movement of the arc-shaped piece 304 drives the limit block 302 to move, so that the limit block 302 moves away from the circular ring gear block 303. The movement of the limit block 302 drives the sliding block 301 to move on the fixed rail 3. Since the movable rod 305 and the L-shaped rod 306 can be combined into a telescopic rod, the movement of the sliding block 301 squeezes the telescopic rod to contract. At the same time, the movement of the sliding block 301 drives the return spring 307 to compress and undergo elastic deformation. Put the ratchet wrench on the hexagon cap 210 and use the ratchet wrench to rotate the hexagon cap 210 to drive it to rotate. The rotation of the hexagon cap 210 drives the rotating shaft 209 and the driving bevel gear 208 to rotate. The rotation of the driving bevel gear 208 drives the driven bevel gear 207 to rotate. The rotation of the driven bevel gear 207 drives the rotating threaded rod 206 to rotate. The rotation of the threaded rod 206 drives the sliding rod 201 to move, so that the two sliding rods 201 move away from each other. The movement of the sliding rod 201 squeezes the telescopic spring 204 to compress and undergo elastic deformation. Use the extrusion force when the telescopic spring 204 is compressed to support the platform plate 102. When the platform plate 102 vibrates, after being shock-absorbed by the telescopic spring 204, it can timely squeeze the platform plate 102 to reset, improving the seismic resistance effect of the platform plate 102. Remove the ratchet wrench. At this time, the return spring 307 in the compressed state drives the telescopic rod and the sliding block 301 to reset. The reset of the sliding block 301 drives the limit block 302 and the arc-shaped piece 304 to reset, so that the limit block 302 contacts and meshes with the circular ring gear block 303, thereby being able to fix the rotating shaft 209 and prevent the rotating shaft 209 from loosening. Lift the mounting cap 402 by hand to drive the T-shaped rotating rod 401 to rotate, so that the T-shaped rotating rod 401 enters one of the card slots on the card strip 403. Rotate the mounting cap 402 and move downward along the vertical rod of the T-shaped rotating rod until the mounting cap 402 contacts the card strip 403, thereby being able to fix the sliding plate 105. It realizes that the staff installs the support frame of the platform plate 102 indoors, so that the staff does not need to perform high-altitude operations, and thus can ensure the personal safety of the staff.

[0048] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A building frame structure with good earthquake resistance effect, including two support columns (1), characterized in that: The tops of the two support columns (1) are fixedly connected together with a frame beam (101). One side of the frame beam (101) is fixedly connected with a platform plate (102). Further included are; Two support tubes (2), both of the two support tubes (2) are arranged below the platform plate (102); A support mechanism, the support mechanism is located on the support tubes (2), and the support mechanism is used to support the platform plate (102); The support mechanism includes sliding rods (201) slidably connected to both ends of the two support tubes (2). One end of each of the four sliding rods (201) is provided with a sliding groove. An active column (202) is slidably connected in each of the four sliding grooves. One end of each of the four active columns (202) is fixedly connected with a U-shaped block (203). A telescopic spring (204) is sleeved on each of the four active columns (202). Two ends of the telescopic spring (204) are respectively fixedly connected with the U-shaped block (203) and the active column (202). Two partition plates (205) are fixedly connected to the inner wall of the support tube (2). A rotation hole is provided on one side of each of the two partition plates (205). A threaded rod (206) is rotatably connected in each of the two rotation holes. The two sliding rods (201) are respectively screwed onto the two threaded rods (206). One end of the two threaded rods (206) close to each other is key-connected with a driven bevel gear (207). An activity hole is provided on one side inner wall of the support tube (2). A rotation shaft (209) is rotatably connected in the activity hole. One end of the rotation shaft (209) is key-connected with a driving bevel gear (208). The two driven bevel gears (207) are both meshed with the driving bevel gear (208). One end of each of the two rotation shafts (209) is fixedly connected with a hexagonal cap (210); A support bar (109) is embedded at the bottom of the platform plate (102). Fixed columns (110) are fixedly connected to both ends of the support bar (109). Two of the U-shaped blocks (203) are respectively rotatably sleeved on the two fixed columns (110). A sliding plate (105) is provided on one side of each of the two support columns (1). A fixed block (106) is fixedly connected to one side of each of the two sliding plates (105). The other two U-shaped blocks (203) are respectively rotatably sleeved on the two fixed blocks (106); Fixed rails (3) are fixedly connected to one side of the two support tubes (2). Sliding blocks (301) are slidably connected on the two fixed rails (3). A limit clamping block (302) is fixedly connected to one side of each of the two sliding blocks (301). Ring gear blocks (303) are fixedly sleeved on the cylindrical outer walls of the two rotation shafts (209). The two ring gear blocks (303) are respectively meshed with the two limit clamping blocks (302); On one side of the two sliding blocks (301) away from the limit clamping block (302), a movable rod (305) is fixedly connected. One end of each of the two movable rods (305) is slidably sleeved with an L-shaped rod (306). The bottom ends of the two L-shaped rods (306) are respectively fixedly connected to the top ends of the two fixed rails (3). A return spring (307) is sleeved on each of the two movable rods (305). The two ends of the return spring (307) are respectively fixedly connected to the L-shaped rod (306) and the sliding block (301).

2. A building frame structure with good earthquake resistance according to claim 1, characterized in that: On both sides of the two support columns (1), a set of expansion bolts (107) are fixedly connected. A U-shaped plate (103) is sleeved on every two groups of the expansion bolts (107). On one side of each of the two U-shaped plates (103), two slide rails (104) are fixedly connected. Two sliding plates (105) are respectively slidably sleeved on the four slide rails (104). A nut (108) is screwed on each of the expansion bolts (107).

3. A building frame structure with good earthquake resistance according to claim 2, characterized in that: The shape of the width cross-section of the support bar (109) is in a "T" shape, and the top of the support bar (109) is located inside the platform plate (102).

4. A building frame structure with good earthquake resistance according to claim 3, characterized in that: On one side of the two limit clamping blocks (302), an arc-shaped piece (304) is fixedly connected. The two arc-shaped pieces (304) are respectively adapted to the two hexagonal caps (210).

5. A building frame structure with good earthquake resistance according to claim 4, characterized in that: On the top of each of the two sliding plates (105), an installation groove (4) is formed. A T-shaped rotating rod (401) is rotatably connected in each of the two installation grooves (4). On one side of each of the two U-shaped plates (103), a clamping bar (403) is fixedly connected. A clamping groove is formed on one side of each of the two clamping bars (403). The top ends of the two T-shaped rotating rods (401) respectively penetrate through two of the clamping grooves and are screwed with installation caps (402).

6. The frame structure of a building with good earthquake resistance according to claim 5, characterized in that: The inner walls of the two installation grooves (4) are fixedly connected with limit bars (404). The two limit bars (404) are respectively adapted to the two T-shaped rotating rods (401).

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