Resetting and fixing orthosis for orthopedics department

Abstract

The invention relates to the technical field of orthotics, and provides an orthopedic reduction and fixation orthotics which comprises a base, a supporting plate is arranged on the inner side of the base, one end of the supporting plate is rotationally connected with the inner wall of the base through a pin shaft, and the other end of the supporting plate is fixedly connected with a fixing frame used for foot orthotics. A buffering mechanism is arranged at the bottom of the supporting plate and comprises an inclined supporting rod, one end of the inner side of the base is fixedly connected with a mounting base, the top end of the mounting base is slidably connected with a sliding rod, one end of the sliding rod is fixedly connected with a connecting base, the bottom end of the inclined supporting rod is hinged to the connecting base, and the sliding rod is sleeved with a buffering spring. An air outlet groove is formed in one side of the base, and a ventilation mechanism is arranged on the inner side of the air outlet groove. The walking sliding rods on the feet of the patient slide, so that the massage mechanisms massage the feet of the patient, blood circulation of the feet of the patient can be promoted, and muscles of the feet of the patient are relaxed.

Description

Technical Field

[0001] The present invention relates to the technical field of orthoses, and in particular to an orthopedic reduction and fixation orthosis. Background Art

[0002] Orthosis is a general term for external devices installed on the limbs, trunk and other parts of the human body. Its purpose is to prevent or correct deformities of the limbs and trunk or treat bone and joint and neuromuscular diseases and compensate for their functions. The main function of lower limb orthosis is to support body weight, assist or replace limb function, limit unnecessary activities of lower limb joints, maintain lower limb stability, improve posture when standing and walking, prevent and correct deformities. When choosing lower limb orthosis, you must pay attention to the fact that there is no obvious compression on the limbs after wearing it. For example, when using KAFO with knee flexion 90°, the popliteal fossa cannot be compressed, and there is no compression on the inner perineum; for patients with edema in the lower limbs, the orthosis should not be close to the skin. Orthosis is a method of fixing bones or joints. First of all, you should understand the structure and mechanical properties of the orthosis and be familiar with its operation techniques to obtain good treatment results.

[0003] After searching, the Chinese patent publication number CN216365473U disclosed "an orthopedic reduction and fixation orthopedic orthosis, including an outer shell, a hard support frame and a hard splint, the hard support frame is fixedly connected to the outer shell, a cavity is opened at the lower inner part of the hard support frame, a plurality of air outlet holes are evenly opened on one side of the hard support frame, the air outlet holes are connected with the cavity, a micro air pump is fixedly installed on one side of the outer shell, the output end of the micro air pump is fixedly connected with one end of the trachea, the end of the trachea is connected with the cavity and installed; a plurality of binding mechanisms are arranged on the outer shell".

[0004] However, in the process of implementing relevant technologies, this type of patent has certain technical defects:

[0005] First, although the patent can fix and correct the foot, after long-term use, the patient's foot muscles cannot relax, resulting in poor blood circulation in the foot, which will cause damage to the foot muscles;

[0006] Second, the orthosis of the patent uses a micro air pump for ventilation. Since the micro air pump needs to be battery-driven and the battery has limited power storage, it needs to be charged or the battery replaced once the power is exhausted. This not only increases the cost of use, but also makes it inconvenient to use because it cannot be used during charging or battery replacement. In view of this, the present invention proposes an orthosis for reduction and fixation for orthopedics. Summary of the invention

[0007] The invention provides an orthopedic reduction and fixation orthosis, which solves the problem of blood circulation loss in the foot caused by long-term use of the orthosis in the prior art.

[0008] The technical solution of the present invention is as follows: an orthopedic reduction and fixation orthosis comprises a base, a support plate is arranged on the inner side of the base, one end of the support plate is rotatably connected to the inner wall of the base through a pin shaft, and the other end of the support plate is fixedly connected to a fixing frame for correcting the foot, and a buffer mechanism is arranged at the bottom of the support plate, and the buffer mechanism comprises an oblique support rod, the top end of the oblique support rod is hinged to one end of the bottom of the support plate, one end of the inner side of the base is fixedly connected to a mounting seat, the top end of the mounting seat is slidably connected to a sliding rod passing through the mounting seat, one end of the sliding rod is fixedly connected to a connecting seat, and the bottom end of the oblique support rod is hinged to the connecting seat, a buffer spring is sleeved on the sliding rod, one end of the buffer spring is in contact with the connecting seat, and the other end of the buffer spring is in contact with the mounting seat, and a massage mechanism for massaging the foot by cooperating with the sliding of the sliding rod is arranged at the bottom of the support plate, an air outlet groove is provided on one side of the base, and a ventilation mechanism for discharging air inside the base by cooperating with the sliding of the sliding rod is arranged on the inner side of the air outlet groove.

[0009] Preferably, a plurality of straps for fixing the feet are fixedly connected to the outer side of the fixing frame.

[0010] Preferably, the massage mechanism includes a movable seat, which is fixedly connected to the middle part of the sliding rod, a connecting rod is hinged at the top end of the movable seat, a mounting plate is hinged at the top end of the connecting rod, a plurality of push rods are fixedly connected to the top of the mounting plate, a plurality of push rods are arrayed on the mounting plate, a plurality of push rods all penetrate the supporting plate, and a plurality of push rods are slidably connected to the supporting plate, and a massage bump is fixedly connected to the top of a plurality of push rods.

[0011] Preferably, the mounting plate is arranged parallel to the supporting plate, and the mounting plate is located directly below the middle position of the supporting plate.

[0012] Preferably, the support plate is provided with a plurality of guide grooves corresponding to the push rods one by one, and the plurality of push rods are slidably connected to the inner walls of the corresponding guide grooves.

[0013] Preferably, the support plate is provided with a plurality of through ventilation holes, a plurality of the ventilation holes are arrayed on the support plate, and a plurality of the ventilation holes are staggered with the guide grooves.

[0014] Preferably, the ventilation mechanism includes an air suction impeller, which is rotatably connected to the inner side of the air outlet slot, one side of the air suction impeller is coaxially fixedly connected to a first gear, the inner side of the base is rotatably connected to a rotating shaft, one end of the rotating shaft is fixedly connected to a second gear, the second gear is meshed with the first gear, and the other end of the rotating shaft is provided with a linkage member that drives the rotating shaft to rotate by sliding in conjunction with a sliding rod.

[0015] Preferably, the number of teeth of the first gear is smaller than the number of teeth of the second gear, and the axes of the first gear and the second gear are located on the same horizontal plane.

[0016] Preferably, the linkage member comprises a rack, the rack is fixedly connected to the end of the sliding rod, and the inner side of the base is rotatably connected to a third gear, and the third gear is meshed with the rack.

[0017] Preferably, the linkage member further comprises a first bevel gear coaxially fixedly connected to the third gear, and the end of the rotating shaft is fixedly connected to a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0018] The working principle and beneficial effects of the present invention are:

[0019] 1. Fix the patient's feet on the fixing frame by means of a strap for correction. During walking, when the base contacts the bottom surface and the foot applies pressure to the support plate, the support plate applies pressure to the diagonal support rod, which applies thrust to the connecting seat, causing the slide bar to slide. At this time, the buffer spring is squeezed by the connecting seat to generate a reverse elastic force, so that the buffer spring buffers the connecting seat, which can reduce the reaction force on the support plate, and also reduce the reaction force on the patient's foot from the support plate, thereby avoiding a large reaction force on the patient's foot during walking and increasing the pressure on the foot;

[0020] 2. The walking slide bar of the patient's foot slides, so that the massage mechanism massages the patient's foot, which can promote blood circulation in the patient's foot and relax the muscles of the patient's foot, thereby avoiding the problem of long-term fixation of the orthopedic muscles of the foot and causing damage;

[0021] 3. When the slide bar is sliding, the ventilation mechanism will discharge the air inside the base, so as to reduce the internal pressure of the base and discharge the air from the area above the support plate that contacts the patient's feet. This will speed up the air flow around the patient's feet and greatly improve the breathability. The whole process provides power for ventilation through the patient's feet walking. The structure is ingenious and does not rely on electric drive, which effectively reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figure 1 The structure of an orthopedic reduction and fixation orthosis of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of an orthopedic reduction and fixation orthosis of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 3 It is a structural schematic diagram of the buffer mechanism of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the massage mechanism of the present invention;

[0027] Figure 5 It is a schematic diagram of the partial structure of the support plate of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the ventilation mechanism of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the linkage member of the present invention.

[0030] In the figure: 1. base; 2. support plate; 21. guide groove; 22. air vent; 3. fixing frame; 4. strap; 5. buffer mechanism; 51. diagonal support rod; 52. mounting seat; 53. slide rod; 54. connecting seat; 55. buffer spring; 6. massage mechanism; 61. movable seat; 62. connecting rod; 63. mounting plate; 64. push rod; 65. massage bump; 7. ventilation mechanism; 71. suction impeller; 72. first gear; 73. rotating shaft; 74. second gear; 75. linkage member; 751. rack; 752. third gear; 753. first bevel gear; 754. second bevel gear; 8. air outlet groove. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 to Figure 7As shown, this embodiment proposes an orthopedic reduction and fixation orthosis, including a base 1, a support plate 2 is arranged on the inner side of the base 1, one end of the support plate 2 is rotatably connected to the inner wall of the base 1 through a pin, the other end of the support plate 2 is fixedly connected to a fixing frame 3 for correcting the foot, the outer side of the fixing frame 3 is fixedly connected to a plurality of straps 4 for fixing the foot, a buffer mechanism 5 is arranged at the bottom of the support plate 2, the buffer mechanism 5 includes an oblique support rod 51, the top end of the oblique support rod 51 is hinged to one end of the bottom of the support plate 2, one end of the inner side of the base 1 is fixedly connected to a mounting seat 52, the mounting seat 52 The top end is slidably connected with a slide rod 53 that passes through the mounting seat 52, one end of the slide rod 53 is fixedly connected with a connecting seat 54, the bottom end of the diagonal support rod 51 is hinged to the connecting seat 54, a buffer spring 55 is sleeved on the slide rod 53, one end of the buffer spring 55 is in contact with the connecting seat 54, and the other end of the buffer spring 55 is in contact with the mounting seat 52, and a massage mechanism 6 is provided at the bottom of the support plate 2 for massaging the foot by cooperating with the sliding of the slide rod 53, an air outlet groove 8 is provided on one side of the base 1, and a ventilation mechanism 7 is provided on the inner side of the air outlet groove 8 for exhausting the air inside the base 1 by cooperating with the sliding of the slide rod 53.

[0033] The patient's foot is fixed to the fixing frame 3 by the strap 4 for correction. During walking, when the base 1 contacts the bottom surface and the foot applies pressure to the support plate 2, the support plate 2 applies pressure to the diagonal support rod 51, so that the diagonal support rod 51 applies thrust to the connecting seat 54, which causes the slide bar 53 to slide. At this time, the buffer spring 55 is squeezed by the connecting seat 54 to generate a reverse elastic force, so that the buffer spring 55 buffers the connecting seat 54, which can reduce the reaction force on the support plate 2, and also reduce the reaction force on the patient's foot on the support plate 2, thereby avoiding the patient's foot from being subjected to a large reaction force during walking and increasing the pressure on the foot;

[0034] The walking slide bar 53 of the patient's foot slides, so that the massage mechanism 6 massages the patient's foot, which can promote blood circulation in the patient's foot and relax the muscles of the patient's foot, thereby avoiding the problem of long-term fixation of the orthopedic muscles of the foot being unable to relax and being damaged;

[0035] When the slide bar 53 is sliding, the ventilation mechanism 7 will discharge the air inside the base 1, thereby reducing the internal pressure of the base 1 and discharging the air in the area above the support plate 2 that contacts the patient's feet. This will speed up the flow of air around the patient's feet, thereby greatly improving the air permeability. The whole process provides power for ventilation through the patient's walking feet. The structure is ingenious, does not rely on electric drive, and effectively reduces the cost of use.

[0036] Furthermore, the massage mechanism 6 includes a movable seat 61, which is fixedly connected to the middle part of the slide rod 53. The top of the movable seat 61 is hinged with a connecting rod 62, and the top of the connecting rod 62 is hinged with a mounting plate 63. The top of the mounting plate 63 is fixedly connected with a plurality of push rods 64, and the plurality of push rods 64 are distributed in an array on the mounting plate 63. The plurality of push rods 64 all penetrate the support plate 2, and the plurality of push rods 64 are slidably connected to the support plate 2. The tops of the plurality of push rods 64 are fixedly connected with massage protrusions 65. The mounting plate 63 is arranged parallel to the support plate 2, and the mounting plate 63 is located directly below the middle position of the support plate 2.

[0037] When the patient's feet walk, when the base 1 contacts the bottom surface and the feet apply pressure to the support plate 2, the support plate 2 applies pressure to the diagonal support rod 51, so that the diagonal support rod 51 applies a thrust to the connecting seat 54, which causes the slide bar 53 to slide. At this time, the buffer spring 55 is compressed and accumulates potential energy, so that the movable seat 61 moves synchronously, so that the connecting rod 62 can apply a thrust to the mounting plate 63, so that all the ejector rods 64 are pushed upward, so that all the massage protrusions 65 apply a pressing force to the patient's feet for massage; when the base 1 is separated from the bottom surface, , the buffer spring 55 releases potential energy, causing the slide bar 53 to slide in the opposite direction, which causes the movable seat 61 to move in the opposite direction, and the connecting rod 62 can apply a pulling force to the mounting plate 63, so that all the top rods 64 move downward and the massage protrusions 65 are separated from the patient's feet. In this way, the massage protrusions 65 can intermittently massage the feet during the walking process of the massage protrusions 65, which can promote blood circulation in the patient's feet and relax the muscles of the patient's feet, thereby avoiding the problem of long-term fixation of the orthopedic muscles of the feet and the inability to relax and damage.

[0038] Furthermore, the support plate 2 is provided with a plurality of guide grooves 21 corresponding to the push rods 64 one by one, and the push rods 64 are slidably connected to the inner walls of the corresponding guide grooves 21. The support plate 2 is provided with a plurality of through-going air holes 22, which are distributed in an array on the support plate 2 and are staggered with the guide grooves 21. The guide grooves 21 can ensure that the push rods 64 remain stable during the sliding process, and the air holes 22 can further improve the air permeability of the patient's foot, greatly improving the comfort of wearing the fixed orthosis.

[0039] Furthermore, the ventilation mechanism 7 includes an air suction impeller 71, which is rotatably connected to the inner side of the air outlet slot 8. A first gear 72 is coaxially fixedly connected to one side of the air suction impeller 71. A rotating shaft 73 is rotatably connected to the inner side of the base 1. A second gear 74 is fixedly connected to one end of the rotating shaft 73. The second gear 74 meshes with the first gear 72. A linkage member 75 is provided at the other end of the rotating shaft 73 for driving the rotating shaft 73 to rotate by sliding in cooperation with the sliding rod 53. The number of teeth of the first gear 72 is less than that of the second gear 74. The axes of the first gear 72 and the second gear 74 are located on the same horizontal plane.

[0040] When the patient's feet walk, when the base 1 contacts the bottom surface and the feet apply pressure to the support plate 2, the support plate 2 applies pressure to the diagonal support rod 51, so that the diagonal support rod 51 applies thrust to the connecting seat 54, which causes the slide bar 53 to slide, so that the linkage member 75 drives the rotating shaft 73 to rotate, so that the second gear 74 rotates, which causes the first gear 72 to rotate synchronously, and the suction impeller 71 to rotate synchronously, and the air inside the base 1 is discharged, so that the internal pressure of the base 1 is reduced, and the air in the area above the support plate 2 that contacts the patient's feet is discharged, thereby accelerating the flow speed of air around the patient's feet, thereby greatly improving the air permeability.

[0041] Furthermore, the linkage member 75 includes a rack 751, which is fixedly connected to the end of the slide rod 53. The inner side of the base 1 is rotatably connected to a third gear 752, which meshes with the rack 751. The third gear 752 is coaxially fixedly connected to a first bevel gear 753. The end of the rotating shaft 73 is fixedly connected to a second bevel gear 754, which meshes with the first bevel gear 753.

[0042] Working principle: The patient's foot is fixed to the fixing frame 3 by the strap 4 for correction. During walking, when the base 1 contacts the bottom surface and the foot applies pressure to the support plate 2, the support plate 2 applies pressure to the diagonal support rod 51, so that the diagonal support rod 51 applies thrust to the connecting seat 54, which causes the slide bar 53 to slide. At this time, the buffer spring 55 is squeezed by the connecting seat 54 to generate a reverse elastic force, so that the buffer spring 55 buffers the connecting seat 54, which can reduce the reaction force on the support plate 2, and also reduce the reaction force on the patient's foot from the support plate 2, thereby avoiding the patient's foot from being subjected to a large reaction force during walking and increasing the pressure on the foot;

[0043] When the patient walks, the base 1 contacts the bottom surface and the foot applies pressure to the support plate 2, which causes the support plate 2 to apply pressure to the diagonal support rod 51, so that the diagonal support rod 51 applies a thrust to the connecting seat 54, which causes the slide bar 53 to slide. At this time, the buffer spring 55 is compressed and accumulates potential energy, so that the movable seat 61 moves synchronously, so that the connecting rod 62 can apply a thrust to the mounting plate 63, so that all the ejector rods 64 are pushed upward, so that all the massage protrusions 65 apply a pressing force to the patient's feet for massage; when the base 1 is separated from the bottom surface, the buffer spring 55 is compressed and accumulates potential energy, so that the movable seat 61 moves synchronously, so that the connecting rod 62 can apply a thrust to the mounting plate 63, so that all the ejector rods 64 are pushed upward, so that all the massage protrusions 65 apply a pressing force to the patient's feet for massage; The impact spring 55 releases potential energy, causing the slide bar 53 to slide in the opposite direction, which causes the movable seat 61 to move in the opposite direction, and the connecting rod 62 can apply a pulling force to the mounting plate 63, so that all the top rods 64 move downward and the massage protrusions 65 are separated from the patient's feet. In this way, the massage protrusions 65 can intermittently massage the feet during the walking process of the massage protrusions 65, which can promote the blood circulation of the patient's feet and relax the muscles of the patient's feet, thereby avoiding the problem of long-term fixation of the orthopedic muscles of the feet and the inability to relax and damage;

[0044] When the patient walks, when the base 1 contacts the bottom surface and the foot applies pressure to the support plate 2, the support plate 2 applies pressure to the diagonal support rod 51, so that the diagonal support rod 51 applies a thrust to the connecting seat 54, which causes the sliding rod 53 to slide, so that the rack 751 moves, so that the rack 751 drives the third gear 752 to rotate, and the first bevel gear 753 rotates synchronously, so that the second bevel gear 754 rotates synchronously, so that the rotating shaft 73 rotates, so that the second gear 74 rotates, so that the first gear 72 rotates synchronously, and the air suction impeller 71 rotates synchronously, and the air inside the base 1 is discharged, so that the internal pressure of the base 1 is reduced, and the air in the area above the support plate 2 that contacts the patient's foot is discharged, so as to accelerate the flow speed of the air around the patient's foot, thereby greatly improving the air permeability. The whole process provides the power for ventilation through the patient's foot walking, and the structure is ingenious, does not need to rely on electric drive, and effectively reduces the cost of use.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An orthopedic reduction and fixation orthosis, comprising a base (1), wherein a support plate (2) is arranged inside the base (1), characterized in that: One end of the support plate (2) is rotatably connected to the inner wall of the base (1) through a pin shaft, and the other end of the support plate (2) is fixedly connected to a fixing frame (3) for correcting the foot. A buffer mechanism (5) is provided at the bottom of the support plate (2), and the buffer mechanism (5) comprises an oblique support rod (51), the top end of the oblique support rod (51) is hinged to one end of the bottom of the support plate (2), one end of the inner side of the base (1) is fixedly connected to a mounting seat (52), the top end of the mounting seat (52) is slidably connected to a sliding rod (53) penetrating the mounting seat (52), and one end of the sliding rod (53) is fixedly connected to a connecting seat ( 54), the bottom end of the diagonal support rod (51) is hinged with the connecting seat (54), a buffer spring (55) is sleeved on the sliding rod (53), one end of the buffer spring (55) is in contact with the connecting seat (54), and the other end of the buffer spring (55) is in contact with the mounting seat (52), the bottom of the support plate (2) is provided with a massage mechanism (6) for massaging the feet by sliding in cooperation with the sliding rod (53), an air outlet groove (8) is provided on one side of the base (1), and a ventilation mechanism (7) is provided on the inner side of the air outlet groove (8) for discharging the air inside the base (1) by sliding in cooperation with the sliding rod (53).

2. The orthopedic reduction and fixation orthosis according to claim 1, characterized in that: A plurality of straps (4) for fixing the feet are fixedly connected to the outer side of the fixing frame (3).

3. The orthopedic reduction and fixation orthosis according to claim 1, characterized in that: The massage mechanism (6) comprises a movable seat (61), wherein the movable seat (61) is fixedly connected to the middle part of the sliding rod (53), the top end of the movable seat (61) is hinged with a connecting rod (62), the top end of the connecting rod (62) is hinged with a mounting plate (63), the top of the mounting plate (63) is fixedly connected with a plurality of push rods (64), the plurality of push rods (64) are distributed in an array on the mounting plate (63), the plurality of push rods (64) all penetrate the supporting plate (2), and the plurality of push rods (64) are slidably connected to the supporting plate (2), and the tops of the plurality of push rods (64) are fixedly connected with massage protrusions (65).

4. The orthopedic reduction and fixation orthosis according to claim 3, characterized in that: The mounting plate (63) is arranged parallel to the support plate (2), and the mounting plate (63) is located directly below the middle position of the support plate (2).

5. The orthopedic reduction and fixation orthosis according to claim 3, characterized in that: The support plate (2) is provided with a plurality of guide grooves (21) corresponding to the push rods (64) one by one, and the plurality of push rods (64) are slidably connected to the inner walls of the corresponding guide grooves (21).

6. The orthopedic reduction and fixation orthosis according to claim 3, characterized in that: The support plate (2) is provided with a plurality of through ventilation holes (22), the plurality of ventilation holes (22) are distributed in an array on the support plate (2), and the plurality of ventilation holes (22) and the guide grooves (21) are arranged in a staggered manner.

7. The orthopedic reduction and fixation orthosis according to claim 6, characterized in that: The ventilation mechanism (7) comprises an air suction impeller (71), the air suction impeller (71) is rotatably connected to the inner side of the air outlet groove (8), one side of the air suction impeller (71) is coaxially fixedly connected to a first gear (72), the inner side of the base (1) is rotatably connected to a rotating shaft (73), one end of the rotating shaft (73) is fixedly connected to a second gear (74), the second gear (74) is meshed with the first gear (72), and the other end of the rotating shaft (73) is provided with a linkage member (75) which drives the rotating shaft (73) to rotate by sliding in cooperation with the sliding rod (53).

8. The orthopedic reduction and fixation orthosis according to claim 7, characterized in that: The number of teeth of the first gear (72) is smaller than the number of teeth of the second gear (74), and the axes of the first gear (72) and the second gear (74) are located on the same horizontal plane.

9. The orthopedic reduction and fixation orthosis according to claim 7, characterized in that: The linkage member (75) comprises a rack (751), the rack (751) is fixedly connected to the end of the slide rod (53), and a third gear (752) is rotatably connected to the inner side of the base (1), and the third gear (752) is meshed with the rack (751).

10. The orthopedic reduction and fixation orthosis according to claim 9, characterized in that: The linkage member (75) further comprises a first bevel gear (753) coaxially fixedly connected to the third gear (752); the end of the rotating shaft (73) is fixedly connected to a second bevel gear (754); the second bevel gear (754) is meshed with the first bevel gear (753).

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