Combined water supply and drainage device

Abstract

The invention discloses a combined water supply and drainage device, and relates to the technical field of water supply and drainage, the combined water supply and drainage device comprises a first pipeline, an opening and closing assembly is arranged on the first pipeline, the opening and closing assembly comprises four limiting grooves formed in the top of the first pipeline, sliding rods are slidably connected in the four limiting grooves, and fan-shaped opening and closing plates are fixedly connected to the tops of the four sliding rods; notches are formed in the positions, located in the center of the first pipeline, of the four fan-shaped opening and closing plates, the pipeline can be automatically adjusted according to the drainage amount of rainstorm, overflow caused by too large flow of the drainage pipeline can be avoided, the situation that a large amount of rainwater inflows in within a short time can be effectively coped with by adjusting the drainage opening, and rainwater accumulation on a street is reduced; in addition, dirt in rainstorm is filtered and cleaned, so that silt cannot be deposited in the pipeline, the resistance of the pipeline is reduced, the pipeline or a valve is prevented from being blocked by garbage and leaves, the risk of pipeline blockage and corrosion is further reduced, and the service life of the pipeline is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of water supply and drainage, and in particular to a combined water supply and drainage device. Background Art

[0002] At present, the water supply and drainage pipelines in some cities are interconnected to arrange rainwater collection systems for centralized treatment and utilization, so as to ensure the sustainable development of urban water resources utilization and environment. Most rainwater collection systems are connected to the drainage pipes in the city during water supply and drainage. The following problems may also arise in the process of collecting rainwater.

[0003] The pipe orifices of the water supply and drainage devices in traditional rainwater collection systems are mostly fixed. When faced with different rainfall amounts, the water supply and drainage devices with fixed pipe orifice sizes cannot flexibly adjust the drainage flow rate. When the rainfall is heavy, the water level in the drainage pipe will rise rapidly, which will put the entire drainage system in a high-load state, easily causing pipe blockage or drainage pump overload. If the pipe orifice is too large but the rainfall is very small, it will easily lead to accumulation of debris inside the drainage system, making it easier for leaves and other debris to enter the drainage system, which will affect the normal operation of the rainwater collection system and increase the difficulty of cleaning and maintenance.

[0004] In order to solve the above problems, a combined water supply and drainage device is proposed. Summary of the invention

[0005] In order to solve the above technical problems, a combined water supply and drainage device is provided. This technical solution solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention can be implemented by the following technical solutions:

[0007] The present invention provides a combined water supply and drainage device, comprising a first pipe, on which an opening and closing assembly is arranged;

[0008] The opening and closing assembly includes four limit grooves on the top of the first pipe, and sliding rods are slidably connected in the four limit grooves. The tops of the four sliding rods are fixedly connected with fan-shaped opening and closing plates, and the four fan-shaped opening and closing plates are located at the center of the first pipe and are provided with notches:

[0009] Furthermore, the four fan-shaped opening and closing plates can be combined into a circle and matched with the first pipe.

[0010] Furthermore, a resistance assembly is provided on the outer surface of the fan-shaped opening and closing plate, and the resistance assembly includes an adjustment rod fixedly connected to the outer surfaces of the four fan-shaped opening and closing plates, and the four adjustment rods are provided with resistance grooves, and the insides of the four resistance grooves are slidably connected with resistance plates, and the adjacent ends of the four resistance plates are commonly fixedly connected with a connecting ring.

[0011] Furthermore, chamfer one is provided at the diagonal of the inner wall of each conflict slot, and chamfer two is provided on both sides of the four conflict plates corresponding to chamfer one.

[0012] Furthermore, a trigger assembly is provided on the outer surface of the first pipe. The trigger assembly includes two arc-shaped connecting rods fixedly connected to the outer surface of the first pipe. The ends of the two arc-shaped connecting rods away from the first pipe are jointly fixedly connected to a second pipe. Two sliding slots are opened in the inner wall of the second pipe. Sliders are slidably connected inside the two sliding slots. The opposite ends of the two sliders are jointly fixedly connected to a control hopper. A drain opening is provided in the middle of the control hopper. An L-shaped connecting rod is fixedly connected to the bottom end of the control hopper.

[0013] Furthermore, a first spring is fixedly connected between the two sliders and the two sliding slots, and the L-shaped connecting rod is fixedly connected to one of the conflict plates.

[0014] Furthermore, a filtering assembly is provided inside the first pipe. The filtering assembly includes two I-shaped slots opened in the inner wall of the first pipe. Sliding blocks are slidably connected inside the two I-shaped slots. A second spring is fixedly connected between the two sliding blocks and the two I-shaped slots. The adjacent ends of the two sliding blocks are jointly fixedly connected to a filter plate. A plurality of first filter holes are circularly arranged on the filter plate. A shielding plate is fixedly connected to the bottom end of the filter plate.

[0015] Furthermore, an opening is provided on the outer surface of the first pipe corresponding to the shielding plate. An arc-shaped receiving plate is fixedly connected to the outer surface of the first pipe below the opening. Second filter holes are arranged in an array on the arc-shaped receiving plate.

[0016] Furthermore, a shielding assembly is provided inside the I-shaped slot. The shielding assembly includes shells fixedly connected to both ends inside the two I-shaped slots. Shaft rods are rotatably connected inside the four shells. Winding cylinders are fixedly connected to the outer surfaces of the four shaft rods. Roller blinds are wound around the four winding cylinders.

[0017] Furthermore, slots matching the roller blinds are opened at the positions corresponding to the roller blinds on the four shells, and torsion springs are installed on the outer surfaces of the four shaft rods.

[0018] As described above, the characteristics and advantages of a combined water supply and drainage device in the present invention are:

[0019] The pipe can be automatically adjusted according to the drainage volume of heavy rain, which can not only prevent the drainage pipe from overflowing due to excessive flow, but also effectively cope with the situation of a large amount of rainwater pouring in within a short time by adjusting the drainage opening, reduce the accumulation of rainwater on the street, and avoid the occurrence of waterlogging. Similarly, when the rainfall decreases, the pipe orifice of the first pipe will also become smaller, which can intercept leaves and other sundries from entering the rainwater collection system through the drainage system, and can also filter the rainwater impurities for preliminary treatment.

[0020] By filtering and cleaning these impurities, the mud and sand in the rainstorm will not be deposited inside the pipe, thereby reducing the resistance of the pipe, avoiding garbage and leaves from clogging the pipe or valve, further reducing the risk of pipe blockage and corrosion, and avoiding a large amount of mud and sand in the rainwater collection system, which reduces the subsequent rainwater collection volume. It also solves the problem of increased difficulty in the subsequent treatment of rainwater, and effectively achieves the purpose of filtering out impurities in the collected rainwater during the rainwater collection process to achieve preliminary treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the combined water supply and drainage device shown in the present invention;

[0022] Figure 2 It is a schematic cross-sectional view of the overall structure of the combined water supply and drainage device shown in the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the first pipeline of the combined water supply and drainage device shown in the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the interference component and the opening and closing component of the combined water supply and drainage device shown in the present invention;

[0025] Figure 5 Schematic diagram of the fan-shaped opening and closing plate and the adjusting rod structure of the combined water supply and drainage device shown in the present invention

[0026] Figure 6 It is a schematic diagram of the structure of the filter plate of the combined water supply and drainage device shown in the present invention.

[0027] Among them, the reference numerals in the present invention are: 1, first pipeline;

[0028] Opening and closing components: 21, limiting groove; 22, sliding rod; 23, fan-shaped opening and closing plate; 24, notch;

[0029] Interference assembly: 31, adjustment rod; 32, interference groove; 33, inclined surface 1; 34, interference plate; 35, inclined surface 2; 36, connecting ring;

[0030] Trigger assembly: 41, arc-shaped connecting rod; 42, second pipe; 43, slide; 44, slider; 45, control bucket; 46, drain outlet; 47, spring 1; 48, L-shaped connecting rod;

[0031] Filter assembly: 51, I-shaped groove; 52, sliding block; 53, spring 2; 54, filter plate; 55, filter hole 1; 56, shielding plate; 57, opening; 58, arc receiving plate; 59, filter hole 2;

[0032] Shielding assembly: 61, shell; 62, shaft; 63, winding cylinder; 64, rolling curtain; 65, notch; 66, coil spring. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] See 1~ Figure 6 As shown, an embodiment of the present invention is provided, and a combined water supply and drainage device will be described in detail below: it includes a first pipe 1, and an opening and closing assembly is arranged on the first pipe 1. The opening and closing assembly includes four limit grooves 21 opened on the top of the first pipe 1, and sliding rods 22 are slidably connected in the four limit grooves 21. The tops of the four sliding rods 22 are fixedly connected with fan-shaped opening and closing plates 23, and the four fan-shaped opening and closing plates 23 are located at the center of the first pipe 1. Notches 24 are arranged.

[0035] Furthermore, the four fan-shaped opening and closing plates 23 can be combined into a circle and matched with the first pipe 1, and the four notches 24 fit together to form a complete circular hole.

[0036] Furthermore, a resistance assembly is provided on the outer surface of the fan-shaped opening and closing plate 23, and the resistance assembly includes an adjustment rod 31 fixedly connected to the outer surfaces of the four fan-shaped opening and closing plates 23, and the four adjustment rods 31 are provided with resistance grooves 32, and the insides of the four resistance grooves 32 are slidably connected with resistance plates 34, and the adjacent ends of the four resistance plates 34 are commonly fixedly connected with a connecting ring 36, and the four resistance plates 34 are connected by the connecting ring 36, so that the four resistance plates 34 can achieve synchronous movement.

[0037] Furthermore, each of the inner walls of the interference grooves 32 is provided with a slope 1 33 at a diagonal angle, and the four interference plates 34 are provided with slope 2 35 on both sides corresponding to the slope 1 33. Every two slopes 1 33 and every two slopes 2 35 are arranged in parallel. At the same time, the initial state of the four interference plates 34 is that the slope 2 35 on the side away from the fan-shaped opening and closing plate 23 is in contact with the slope 1 33.

[0038] Further, a triggering component is provided on the outer surface of the first pipe 1. The triggering component includes two arc-shaped connecting rods 41 fixedly connected to the outer surface of the first pipe 1. The ends of the two arc-shaped connecting rods 41 away from the first pipe 1 are jointly and fixedly connected to a second pipe 42. Two sliding grooves 43 are formed in the inner wall of the second pipe 42. Two sliders 44 are slidably connected inside the two sliding grooves 43. The opposite ends of the two sliders 44 are jointly and fixedly connected to a control hopper 45. A drain port 46 is formed in the middle of the control hopper 45. An L-shaped connecting rod 48 is fixedly connected to the bottom end of the control hopper 45.

[0039] Further, a first spring 47 is fixedly connected between the two sliders 44 and the two sliding grooves 43. The L-shaped connecting rod 48 is fixedly connected to a contact plate 34. The power between the control hopper 45 and the four contact plates 34 is connected through the L-shaped connecting rod 48. In addition, whether the rainfall exceeds a certain level is detected through the control hopper 45 and the drain port 46. Then, when the control hopper 45 descends, the power is transmitted to the four contact plates 34 through the L-shaped connecting rod 48.

[0040] Further, a filtering component is provided inside the first pipe 1. The filtering component includes two I-shaped grooves 51 formed in the inner wall of the first pipe 1, and the two I-shaped grooves 51 are arranged oppositely. Two sliding blocks 52 are slidably connected in the two I-shaped grooves 51. A second spring 53 is fixedly connected between the two sliding blocks 52 and the two I-shaped grooves 51. The adjacent ends of the two sliding blocks 52 are jointly and detachably connected to a filter plate 54, and the filter plate 54 and the sliding block 52 are detachably connected by bolts, which is convenient to replace different filter plates 54 according to the actual situation. A plurality of first filter holes 55 are circularly arranged on the filter plate 54. A shielding plate 56 is fixedly connected to the bottom end of the filter plate 54.

[0041] Further, an opening 57 is formed in the outer surface of the first pipe 1 corresponding to the position of the shielding plate 56. An arc-shaped receiving plate 58 is fixedly connected to the outer surface of the first pipe 1 below the opening 57. A plurality of second filter holes 59 are arranged in an array on the arc-shaped receiving plate 58.

[0042] Further, a shielding component is provided in the I-shaped groove 51. The shielding component includes a housing 61 fixedly connected to both ends inside the two I-shaped grooves 51. A shaft rod 62 is rotatably connected inside each of the four housings 61. A winding cylinder 63 is fixedly connected to the outer surface of each of the four shaft rods 62. A rolling curtain 64 is wound outside each of the four winding cylinders 63. The two rolling curtains 64 in each I-shaped groove 51 are respectively fixedly connected to both ends of the sliding block 52.

[0043] Further, slots 65 that match each other are provided at the positions of the four housings 61 corresponding to the rolling curtain 64. A torsion spring 66 is installed on the outer surface of each of the four shaft rods 62. The width of the rolling curtain 64 matches the vertical part in the middle of the T-shaped groove 51, and the widths of the ends of the two T-shaped grooves 51 are greater than the vertical part of the T-shaped groove 51, so that the rolling curtain 64 provided inside each of the two housings 61 in each T-shaped groove 51 can block the vertical part of the T-shaped groove 51.

[0044] Combined with the above embodiments, the following is the entire working process and working principle of the above embodiments:

[0045] The working state is as follows: When collecting rainwater, the device is installed in the drainage systems such as urban roads and communities, and then the device is connected to the rainwater collection system for collection.

[0046] When encountering heavy rain, the second pipe 42 will receive the heavy rain first. Since the second pipe 42 is higher than the first pipe 1 and the connecting ring 36, rainwater from the road and other directions will first flow into the second pipe 42. The control bucket 45 in the second pipe 42 will collect the rainwater, and the collected rainwater will flow out along the drain opening 46 opened on the control bucket 45. When the rainfall is greater than the drainage volume of the drain opening 46, the rainwater cannot be discharged in time and will accumulate in the control bucket 45. The weight of the control bucket 45 will increase due to the accumulated rainwater. At this time, the control bucket 45 will drive the slider 44 to slide downward in the chute 43, and at the same time, compress the first spring 47. During the downward movement of the control, the L-shaped connecting rod 48 will be driven to descend. When the L-shaped connecting rod 48 descends, it will drive the contact plate 34 connected to it to descend. Since the four contact plates 34 are connected together by the connecting ring 36, at this time, the four contact plates 34 will descend along the contact grooves 32. At this time, the contact grooves 32 opened on the four adjusting rods 31 will be abutted by the second inclined surfaces 35 outside the four contact plates 34. At this time, the four adjusting rods 31 will move in opposite directions around the first pipe 1. During the movement of the four adjusting rods 31, the four sector-shaped opening and closing plates 23 connected to their ends will move in opposite directions around the first pipe 1. At this time, the size of the pipe orifice of the first pipe 1 will become larger. When the control bucket 45 is full of water, the two sliders 44 will move to the bottom of the chute 43, and at the same time, the four sector-shaped opening and closing plates 23 will be fully opened. The first inclined surface 33 of the contact groove 32 on the adjusting rod 31 close to the sector-shaped opening and closing plate 23 will be abutted by the second inclined surface 35 on the other side of the contact plate 34. In this way, after the rainfall decreases, the water in the shielding bucket will flow out along the drain opening 46. The first spring 47 will reset and push the slider 44 and the control bucket 45 to reset. At the same time, the L-shaped connecting rod 48, the four contact plates 34 and the connecting ring 36 will all slide upward. The second inclined surface 35 on the other side of the four contact plates 34 will abut the first inclined surface 33. At this time, the adjusting rod 31 will drive the sector-shaped opening and closing plate 23 to slide toward the center of the first pipe 1 through the sliding rod 22 in the limiting groove 21. In this way, the first pipe 1 can automatically adjust according to the drainage volume of the heavy rain, which can not only prevent the drainage pipe from overflowing due to excessive flow, but also the adjustable drainage opening 57 can effectively cope with the situation of a large amount of rainwater pouring in in a short time, reduce the accumulation of rainwater on the street, and avoid the occurrence of waterlogging. Similarly, when the rainfall decreases, the pipe orifice of the first pipe 1 will also become smaller, which can intercept leaves and other sundries from passing through the drainage system and then into the rainwater collection system, and can also achieve the effect of preliminary treatment of rainwater impurity filtration.

[0047] When draining and collecting rainstorms in the first pipeline 1, the first filter holes 55 on the internal filter plate 54 thereof will filter the dirt in the rainstorm. When the dirt on the filter plate 54 accumulates to a certain extent, the dirt on the filter plate 54 will block the first filter holes 55. At this time, it will be very difficult for the first pipeline 1 to continue draining water. However, the water with a large flow rate will accumulate at the position above the filter plate 54 in the first pipeline 1, making the downward acting force on the filter plate 54 become larger. Furthermore, the filter plate 54 will drive the sliding block 52 to move downward in the I-shaped groove 51, and at the same time, it will also squeeze the second spring 53. During the descent, the shielding plate 56 will continuously block the opening 57 on the first pipeline 1. When it descends to a certain extent, the filter plate 54 will move down to a position flush with the opening 57. At this time, the impact force of the water flow will wash the dirt on the filter plate 54 out of the opening 57 on the first pipeline 1 onto the arc-shaped receiving plate 58. Furthermore, the dirt will be collected by the second filter holes 59 on the arc-shaped receiving plate 58. At this time, the dirt in the first filter holes 55 on the filter plate 54 is washed away, restoring the drainage volume of the first pipeline 1. At the same time, the squeezed second spring 53 will reset and push the sliding block 52 and the filter plate 54 to reset. At the same time, the shielding plate 56 will also reset to block the opening 57 outside the first pipeline 1. By filtering and cleaning these dirt, the sediment in the rainstorm will not deposit inside the pipeline, thereby reducing the resistance of the pipeline, avoiding the blockage of the pipeline or valve by garbage and leaves, further reducing the risk of pipeline blockage and corrosion, and also avoiding a large amount of sediment in the rainwater collection system, which reduces the subsequent rainwater collection volume, and solving the problem of increased difficulty in the subsequent treatment process of rainwater. Furthermore, the purpose of effectively filtering the impurities in the collected rainwater during the rainwater collection process to obtain preliminary treatment is achieved. During the movement of the two sliding blocks 52, the rolling curtains 64 fixed at both ends thereof will also be pulled. When the two sliding blocks 44 move downward and the two rolling curtains 64 in each I-shaped groove 51 are pulled, the upper rolling curtain 64 will drive the upper winding cylinder 63 and the shaft rod 62 to rotate, and drive the upper coil spring 66 to be wound up. At the same time, the rolling curtain 64 on the upper winding cylinder 63 is released, so that the rolling curtain 64 protrudes from the notch 65 outside the housing 61. At the same time, the lower rolling curtain 64 will not be pulled by the sliding block 52, and the coil spring 66 arranged inside the lower housing 61 will unfold from the wound state, thereby driving the lower shaft rod 62 and the winding cylinder 63 to rotate in the opposite direction to the upper shaft rod 62 and the winding cylinder 63, and winding up the lower rolling curtain 64. When the sliding block 52 in each I-shaped groove 51 resets and moves upward, the above actions operate in the opposite direction. In this way, during the movement of the two sliding blocks 52 in the I-shaped groove 51, the rolling curtains 64 fixed at both ends thereof will be pulled to protrude from the housing 61 to block the I-shaped groove 51. In this way, during the movement of the sliding block 52 and the filter plate 54, the dirt in the rainstorm enters the I-shaped groove 51, thereby affecting the use.

[0048] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined water supply and drainage device, comprising a first pipe (1), characterized in that, An opening and closing component is provided on the first pipe (1); The opening and closing assembly comprises four limit grooves (21) formed on the top of a first pipe (1), slide bars (22) being slidably connected in the four limit grooves (21), fan-shaped opening and closing plates (23) being fixedly connected to the tops of the four slide bars (22), and notches (24) being provided at positions located at the center of the first pipe (1).

2. The combined water supply and drainage device according to claim 1, characterized in that: The four fan-shaped opening and closing plates (23) can be combined into a circle and matched with the first pipe (1).

3. The combined water supply and drainage device according to claim 2, characterized in that: An abutment assembly is provided on the outer surface of the fan-shaped opening and closing plate (23), the abutment assembly comprising an adjustment rod (31) fixedly connected to the outer surfaces of the four fan-shaped opening and closing plates (23), the four adjustment rods (31) are each provided with an abutment groove (32), the interiors of the four abutment grooves (32) are each slidably connected to an abutment plate (34), and adjacent ends of the four abutment plates (34) are commonly fixedly connected to a connecting ring (36).

4. The combined water supply and drainage device according to claim 3, characterized in that: Each of the inner walls of the abutment grooves (32) is provided with a first inclined surface (33) at a diagonal angle, and two inclined surfaces (35) are provided on both sides of the four abutment plates (34) corresponding to the first inclined surface (33).

5. The combined water supply and drainage device according to claim 4, characterized in that: The outer surface of the first pipe (1) is provided with a trigger assembly, which comprises two arc-shaped connecting rods (41) fixedly connected to the outer surface of the first pipe (1), the two arc-shaped connecting rods (41) are fixedly connected to the second pipe (42) at one end away from the first pipe (1), the inner wall of the second pipe (42) is provided with two slide grooves (43), the insides of the two slide grooves (43) are slidably connected with sliders (44), the opposite ends of the two sliders (44) are fixedly connected to a control bucket (45), the middle part of the control bucket (45) is provided with a drainage port (46), and the bottom end of the control bucket (45) is fixedly connected to an L-shaped connecting rod (48).

6. The combined water supply and drainage device according to claim 5, characterized in that: A spring 1 (47) is fixedly connected between the two sliding blocks (44) and the two sliding grooves (43), and an L-shaped connecting rod (48) is fixedly connected to a contact plate (34).

7. The combined water supply and drainage device according to claim 6, characterized in that: A filter assembly is arranged inside the first pipe (1), and the filter assembly comprises two I-shaped grooves (51) provided on the inner wall of the first pipe (1), a sliding block (52) being slidably connected in each of the two I-shaped grooves (51), a spring (53) being fixedly connected between the two sliding blocks (52) and the two I-shaped grooves (51), a filter plate (54) being fixedly connected at one end of the two sliding blocks (52) being close to each other, a plurality of filter holes (55) being provided in a circular array on the filter plate (54), and a shielding plate (56) being fixedly connected to the bottom end of the filter plate (54).

8. The combined water supply and drainage device according to claim 7, characterized in that: An opening (57) is provided on the outer surface of the first pipe (1) at a position corresponding to the shielding plate (56); an arc-shaped receiving plate (58) is fixedly connected to the outer surface of the first pipe (1) below the opening (57); and filter holes (59) are arranged in an array on the arc-shaped receiving plate (58).

9. The combined water supply and drainage device according to claim 8, characterized in that: An I-shaped groove (51) is provided with a shielding component. The shielding component includes a housing (61) fixedly connected to both ends inside the two I-shaped grooves (51). A shaft rod (62) is rotatably connected to the inside of each of the four housings (61). A winding cylinder (63) is fixedly connected to the outer surface of each of the four shaft rods (62). A rolling curtain (64) is wound around each of the four winding cylinders (63).

10. The combined water supply and drainage device according to claim 9, wherein: Notches (65) matching the rolling curtain (64) are provided at positions corresponding to the rolling curtain (64) on each of the four housings (61). A torsion spring (66) is installed on the outer surface of each of the four shaft rods (62).

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