Handheld aromatherapy diffuser with negative pressure trigger structure

Abstract

The invention relates to the technical field of handheld aromatherapy machines, and provides a handheld aromatherapy machine with a negative pressure trigger structure, the handheld aromatherapy machine comprises a protective shell, the top end of the protective shell is fixedly connected with a top cover, the upper surface of the top cover is provided with an air suction hole, the bottom of the top cover is fixedly connected with a negative pressure bin, the air suction hole is communicated with the negative pressure bin, and the negative pressure bin is communicated with the negative pressure trigger structure. A one-way air valve is fixedly connected to the bottom of the negative pressure bin, a negative pressure sensor is fixedly connected to the outer side wall of the negative pressure bin, and a fan is fixedly connected to the inner side wall of the protective shell. According to the technical scheme, the problems that in the prior art, when a snorting type aromatherapy machine is idle, dust and foreign matter easily enter the machine through an air inlet and an air outlet, and when the snorting type aromatherapy machine is used, the dust and the foreign matter are easily inhaled into the human body by the nasal cavity or blown to the face along with airflow, the use experience is affected, and the health of the human body is harmed are solved.

Description

Technical Field

[0001] This invention relates to the field of handheld aroma diffuser technology, specifically to a handheld aroma diffuser with a negative pressure triggering structure. Background Technology

[0002] An aroma diffuser is a small household appliance that uses atomization technology to diffuse essential oils (or essential oil mixtures) into the air, achieving fragrance regulation, mood soothing, and environmental improvement. Combining atomization technology with aromatherapy functions, it is widely used in homes, offices, and cars. With the diversification of people's needs, aroma diffusers have also evolved into various models. Among them, aroma diffusers that produce fragrance through aromatherapy tablets have emerged. These diffusers can emit scented air without atomizing aromatherapy liquid, and they offer various triggering methods. Models that trigger operation through inhalation via the nostrils and blow the fragrance onto the face are particularly popular. However, when these diffusers are not in use, dust and foreign objects can easily enter the machine through its air inlet and outlet. During use, dust and foreign objects can be inhaled through the nasal cavity or blown onto the face by the airflow, affecting the user experience and potentially harming health. Therefore, this invention proposes a handheld aroma diffuser with a negative pressure triggering structure. Summary of the Invention

[0003] This invention proposes a handheld aroma diffuser with a negative pressure triggering structure, which solves the problem in related technologies where dust and foreign objects can easily enter the interior of a nasal inhalation aroma diffuser through its air inlet and outlet when it is not in use. When in use, dust and foreign objects can be easily inhaled into the nasal cavity or blown to the face by the airflow, which not only affects the user experience but also harms human health.

[0004] The technical solution of the present invention is as follows: A handheld aroma diffuser with a negative pressure triggering structure includes a protective shell, a top cover fixedly connected to the top of the protective shell, an air intake hole opened on the upper surface of the top cover, a negative pressure chamber fixedly connected to the bottom of the top cover, the air intake hole communicating with the negative pressure chamber, a one-way valve fixedly connected to the bottom of the negative pressure chamber, a negative pressure sensor fixedly connected to the outer side wall of the negative pressure chamber, a fan fixedly connected to the inner side wall of the protective shell, a negative ion generator fixedly connected to the inner side wall of the protective shell, the negative ion generator being located below the fan, and two symmetrically arranged air duct baffles fixedly connected to the inner side wall of the protective shell. The top surface of the top cover has ventilation slots. Two symmetrically arranged sliding baffles are slidably connected inside the top cover. The sliding baffles are located in the ventilation slots. Two symmetrically arranged air outlet opening and closing mechanisms are fixedly connected to the outer wall of the negative pressure chamber. The air outlet opening and closing mechanisms are fixedly connected to the bottom of the top cover. The two air outlet opening and closing mechanisms are respectively fixedly connected to the two sliding baffles. Two symmetrically arranged air inlet opening and closing mechanisms are fixedly connected to the outer wall of the negative pressure chamber. The air inlet opening and closing mechanisms are slidably connected to the air duct partition. An air intake opening and closing mechanism is provided in the air intake hole.

[0005] Preferably, the ventilation slot is located on one side of the air intake hole, and a ventilation mesh plate is fixedly connected to the inner wall of the ventilation slot. Four rectangular positioning blocks are fixedly connected to the upper surface of the ventilation mesh plate, and an aromatherapy tablet is placed between the four positioning blocks. The aromatherapy tablet abuts against the upper surface of the ventilation mesh plate. A cover plate is snapped onto the upper surface of the top cover. The cover plate is located above the ventilation slot and on one side of the air intake hole, with its horizontal height lower than the top of the air intake hole. Multiple evenly distributed air outlets are opened on the upper surface of the cover plate. Two symmetrically arranged pressure strips are fixedly connected to the bottom of the cover plate, and the pressure strips abut against the upper surface of the aromatherapy tablet.

[0006] Preferably, the sensing end of the negative pressure sensor is located inside the negative pressure chamber, the negative pressure sensor is electrically connected to the fan, and the negative pressure sensor is electrically connected to the negative ion generator.

[0007] Preferably, the air outlet opening and closing mechanism includes a first cylinder, which is fixedly installed on one side of the negative pressure chamber. An installation collar is fixedly sleeved on the telescopic end of the first cylinder, and the first cylinder is fixedly connected to the bottom of the top cover through the installation collar. A Z-shaped transmission rod is fixedly connected to the telescopic end of the first cylinder away from the negative pressure chamber. A first return spring is slidably sleeved on the telescopic end of the first cylinder. The two ends of the first return spring abut against the sides of the first cylinder body and the Z-shaped transmission rod that are close to each other. A vertical rod is fixedly connected to the end of the Z-shaped transmission rod away from the first cylinder, and the vertical rod is fixedly connected to the bottom of the sliding cover.

[0008] Preferably, the first reset spring is set in a compressed state.

[0009] Preferably, the air intake opening and closing mechanism includes a second cylinder, which is fixedly installed on one side of the negative pressure chamber. A limiting collar is fixedly sleeved on the telescopic end of the second cylinder, and a second return spring is slidably sleeved on the telescopic end of the second cylinder. The two ends of the second return spring abut against the sides of the body of the second cylinder and the limiting collar that are close to each other. The telescopic end of the second cylinder is slidably installed on one side of the air duct partition. A closing baffle is fixedly connected to the end of the telescopic end of the second cylinder away from the negative pressure chamber. An air inlet is opened on the outer wall of the protective shell, and the closing baffle is located in the air inlet.

[0010] Preferably, the second reset spring is in a compressed state, and the outer wall size of the closing baffle is adapted to the inner wall size of the air inlet.

[0011] Preferably, the intake opening and closing mechanism includes a fixed ring, which is fixedly connected to the inner wall of the intake hole. Two symmetrically arranged semi-circular baffles are movably hinged to the upper surface of the fixed ring. Two symmetrically arranged arc-shaped slots are opened inside the top cover. An arc-shaped insert rod is slidably inserted into each of the two arc-shaped slots. An arc-shaped return spring is provided inside the arc-shaped slot. The two ends of the arc-shaped return spring abut against the arc-shaped insert rod and the inner wall of the top cover, respectively. The end of the arc-shaped insert rod away from the arc-shaped return spring is fixedly connected to the upper surface of the semi-circular baffle. The arc-shaped return spring is set in a compressed state.

[0012] The beneficial effects of this invention are as follows: 1. Take a deep breath and feel the fragrant breeze on your face to relieve stress and relax, enhancing the user experience. Triggered by inhaling through the nostrils, the fragrance is blown to the face through the ventilation channels, enhancing facial awareness during deep breathing, quickly relieving stress and relaxing, and the built-in negative ion generator purifies the air while releasing fragrance.

[0013] 2. Intelligent sealing protection for superior cleanliness. Through multiple sets of opening and closing mechanisms linked by negative pressure (inhalation opening and closing mechanism, air outlet opening and closing mechanism, and air intake opening and closing mechanism), the entire channel is sealed when the equipment is not in use. The semi-circular baffle of the air intake, the sliding baffle of the ventilation slot, and the closing baffle of the air inlet close simultaneously, which can effectively prevent dust, hair, and other foreign objects from entering the machine body. This solves the problem of internal dust accumulation caused by long-term exposure in traditional aromatherapy diffusers, ensuring the cleanliness of the equipment's interior and avoiding the health hazards of foreign objects coming into contact with the human body during use. 3. Instant negative pressure triggering for more convenient operation. Using the negative pressure generated by the user's inhalation as the trigger signal, it eliminates the need for manual button or touch operation, conforming to natural breathing movements and making it especially suitable for scenarios requiring quick activation, such as offices and rest areas. The negative pressure sensor is highly responsive, with a delay of less than 0.5 seconds from inhalation to device activation, achieving a seamless transition of "inhalation to work, stopping to turn off," enhancing ease of use.

[0014] 4. Atomization-free design for enhanced safety and maintainability. Using aromatherapy tablets instead of traditional atomized liquid aromatherapy avoids the risk of liquid leakage and eliminates respiratory sensitivities that may be caused by atomized particles, making it suitable for a wider range of people (including children and those with respiratory sensitivities). The aromatherapy tablets are secured by positioning blocks and snap-on covers, and replacement is as simple as removing the cover, eliminating the need to disassemble complex parts and reducing maintenance costs. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is an overall perspective view of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the air outlet opening and closing mechanism and the air inlet opening and closing mechanism in this invention; Figure 4 This is a schematic diagram of the internal structure of the present invention during use; Figure 5 This is a schematic diagram of the rear structure of the negative pressure chamber in this invention; Figure 6 This is a schematic diagram of the top cover structure in this invention; Figure 7 This is a schematic diagram of the cover plate in this invention; Figure 8 This is a schematic diagram of the intake opening and closing mechanism in this invention; Figure 9 for Figure 8 A magnified structural diagram of part A in the middle.

[0017] In the diagram: 1. Protective outer casing; 11. Top cover; 12. Air intake port; 13. Negative pressure chamber; 14. One-way air valve; 15. Negative pressure sensor; 16. Fan; 17. Negative ion generator; 18. Air duct partition; 2. Ventilation slot; 21. Ventilation mesh panel; 22. Positioning block; 23. Aromatherapy tablet; 24. Cover plate; 25. Air outlet; 26. Pressure strip; 3. Sliding cover; 4. Air outlet opening and closing mechanism; 41. No. 1 cylinder; 42. Mounting collar; 43. Z-shaped transmission rod; 44. No. 1 return spring; 45. Vertical rod; 5. Intake opening and closing mechanism; 51. No. 2 cylinder; 52. Limiting collar; 53. No. 2 return spring; 54. Closing baffle; 55. Intake port; 6. Inhalation opening and closing mechanism; 61. Fixing ring; 62. Semicircular baffle; 63. Arc-shaped slot; 64. Arc-shaped insert rod; 65. Arc-shaped return spring. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example like Figures 1-9 As shown, this embodiment proposes a handheld aroma diffuser with a negative pressure triggering structure, including a protective shell 1. A top cover 11 is fixedly connected to the top of the protective shell 1. An air intake hole 12 is opened on the upper surface of the top cover 11. A negative pressure chamber 13 is fixedly connected to the bottom of the top cover 11. The air intake hole 12 communicates with the negative pressure chamber 13. A one-way valve 14 is fixedly connected to the bottom of the negative pressure chamber 13. A negative pressure sensor 15 is fixedly connected to the outer wall of the negative pressure chamber 13. A fan 16 is fixedly connected to the inner wall of the protective shell 1. A negative ion generator 17 is fixedly connected to the inner wall of the protective shell 1. The negative ion generator 17 is located below the fan 16. Two symmetrically arranged air duct partitions 18 are fixedly connected to the inner wall of the protective shell 1. The top cover 11 has a ventilation slot 2 on its upper surface. Two symmetrically arranged sliding baffles 3 are slidably connected inside the top cover 11. The sliding baffles 3 are located in the ventilation slot 2. Two symmetrically arranged air outlet opening and closing mechanisms 4 are fixedly connected to the outer wall of the negative pressure chamber 13. The air outlet opening and closing mechanisms 4 are fixedly connected to the bottom of the top cover 11. The two air outlet opening and closing mechanisms 4 are respectively fixedly connected to the two sliding baffles 3. Two symmetrically arranged air inlet opening and closing mechanisms 5 are fixedly connected to the outer wall of the negative pressure chamber 13. The air inlet opening and closing mechanisms 5 are slidably connected to the air duct partition 18. An air intake opening and closing mechanism 6 is provided in the air intake hole 12.

[0020] The ventilation slot 2 is located on one side of the air intake hole 12. A ventilation mesh plate 21 is fixedly connected to the inner wall of the ventilation slot 2. Four rectangular positioning blocks 22 are fixedly connected to the upper surface of the ventilation mesh plate 21. A fragrance chip 23 is arranged between the four positioning blocks 22. The fragrance chip 23 abuts against the upper surface of the ventilation mesh plate 21. A cover plate 24 is snapped onto the upper surface of the top cover 11. The cover plate 24 is located above the ventilation slot 2. The cover plate 24 is located on one side of the air intake hole 12 and its horizontal height is lower than the horizontal height of the top of the air intake hole 12. Multiple evenly distributed air outlets 25 are opened on the upper surface of the cover plate 24. Two symmetrically arranged pressure strips 26 are fixedly connected to the bottom of the cover plate 24. The pressure strips 26 abut against the upper surface of the fragrance chip 23.

[0021] The sensing end of the negative pressure sensor 15 is located inside the negative pressure chamber 13. The negative pressure sensor 15 is electrically connected to the fan 16 and the negative ion generator 17.

[0022] The air outlet opening and closing mechanism 4 includes a first cylinder 41, which is fixedly installed on one side of the negative pressure chamber 13. An installation collar 42 is fixedly sleeved on the telescopic end of the first cylinder 41. The first cylinder 41 is fixedly connected to the bottom of the top cover 11 through the installation collar 42. A Z-shaped transmission rod 43 is fixedly connected to the telescopic end of the first cylinder 41 away from the negative pressure chamber 13. A first return spring 44 is slidably sleeved on the telescopic end of the first cylinder 41. The two ends of the first return spring 44 abut against the sides of the first cylinder 41 body and the Z-shaped transmission rod 43 that are close to each other. A vertical rod 45 is fixedly connected to the end of the Z-shaped transmission rod 43 away from the first cylinder 41. The vertical rod 45 is fixedly connected to the bottom of the sliding baffle 3. The air outlet opening and closing mechanism 4 can prevent dust and foreign objects from entering the device through the ventilation slot 2 when the device is idle.

[0023] The first reset spring 44 is set in a compressed state, and the compressed first reset spring 44 can provide driving force for the reset of the sliding cover 3.

[0024] The air intake opening and closing mechanism 5 includes a second cylinder 51, which is fixedly installed on one side of the negative pressure chamber 13. A limiting collar 52 is fixedly sleeved on the telescopic end of the second cylinder 51, and a second return spring 53 is slidably sleeved on the telescopic end of the second cylinder 51. The two ends of the second return spring 53 abut against the body of the second cylinder 51 and the side of the limiting collar 52 that are close to each other. The telescopic end of the second cylinder 51 is slidably installed on one side of the air duct partition 18. A closing baffle 54 is fixedly connected to the end of the telescopic end of the second cylinder 51 away from the negative pressure chamber 13. An air inlet 55 is opened on the outer wall of the protective shell 1, and the closing baffle 54 is located in the air inlet 55. The air intake opening and closing mechanism 5 can prevent dust and foreign objects from entering the device through the air inlet 5 when the device is idle.

[0025] The second return spring 53 is set in a compressed state, and the outer wall size of the closed baffle 54 is adapted to the inner wall size of the air inlet 55. The compressed second return spring 53 can provide driving force for the reset of the closed baffle 54.

[0026] The suction opening and closing mechanism 6 includes a fixed ring 61, which is fixedly connected to the inner wall of the suction hole 12. Two symmetrically arranged semi-circular baffles 62 are movably hinged to the upper surface of the fixed ring 61. Two symmetrically arranged arc-shaped slots 63 are opened inside the top cover 11. Arc-shaped insert rods 64 are slidably inserted into each of the two arc-shaped slots 63. Arc-shaped return springs 65 are arranged inside the arc-shaped slots 63. The two ends of the arc-shaped return springs 65 abut against the arc-shaped insert rods 64 and the inner wall of the top cover 11, respectively. The end of the arc-shaped insert rods 64 away from the arc-shaped return springs 65 is fixedly connected to the upper surface of the semi-circular baffles 62. The arc-shaped return springs 65 are arranged in a compressed state. The suction opening and closing mechanism 6 can prevent dust and foreign objects from entering the negative pressure chamber 13 when the device is idle.

[0027] Specifically, the working process of this device is as follows: 1. Idle state: The semi-circular baffle 62 of the intake opening and closing mechanism 6 is closed, the sliding baffle 3 blocks the ventilation slot 2, and the closing baffle 54 of the intake opening and closing mechanism 5 closes the air inlet 55. The whole machine is in a sealed state to prevent dust from entering. 2. Triggering Operation: The user inhales through the nostrils towards the air intake 12, generating negative pressure in the negative pressure chamber 13. Upon detecting the pressure change, the negative pressure sensor 15 activates the fan 16 and the negative ion generator 17, supplying air to cylinders 41 and 51. Cylinder 41 retracts its telescopic end, causing the sliding baffle 3 to open the ventilation slot; cylinder 51 retracts its telescopic end, pulling the closing baffle 54 to open the air inlet 55; simultaneously, the semi-circular baffle 62 inside the air intake is pushed open by the airflow, compressing the arc-shaped return spring 65.

[0028] 3. Aroma release: Outside air enters through the air inlet 55, is purified by the negative ion generator 17, flows through the aroma diffuser 23, and carries the aroma through the ventilation slot 2 and the air outlet 25 to blow it toward the face; part of the airflow enters the negative pressure chamber 13 through the one-way valve 14 to maintain the negative pressure state.

[0029] 4. Stop working: When the user stops inhaling, the pressure in the negative pressure chamber 13 rises, the negative pressure sensor 15 triggers power off, the first cylinder 41 and the second cylinder 51 lose pressure, the reset spring pushes the sliding cover 3 and the closing baffle 54 to reset and close the channel; the semi-circular baffle 62 of the air intake hole closes under the action of the arc-shaped reset spring 65, and the whole machine returns to the sealed state.

[0030] The above are merely 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 within the protection scope of the present invention.

Claims

1. A handheld aroma diffuser with a negative pressure triggering structure, characterized in that, The protective housing (1) includes a top cover (11) fixedly connected to the top of the protective housing (1). An air intake hole (12) is provided on the upper surface of the top cover (11). A negative pressure chamber (13) is fixedly connected to the bottom of the top cover (11). The air intake hole (12) is connected to the negative pressure chamber (13). A one-way air valve (14) is fixedly connected to the bottom of the negative pressure chamber (13). A negative pressure sensor (15) is fixedly connected to the outer wall of the negative pressure chamber (13). A fan (16) is fixedly connected to the inner wall of the protective housing (1). A negative ion generator (17) is fixedly connected to the inner wall of the protective housing (1). The negative ion generator (17) is located below the fan (16). Two symmetrically arranged air duct baffles (18) are fixedly connected to the inner wall of the protective housing (1). The top cover (11) has a ventilation slot (2) on its upper surface. The top cover (11) has two symmetrically arranged sliding baffles (3) that are slidably connected inside. The sliding baffles (3) are located in the ventilation slot (2). The negative pressure chamber (13) has two symmetrically arranged air outlet opening and closing mechanisms (4) that are fixedly connected to its outer side wall. The air outlet opening and closing mechanisms (4) are fixedly connected to the bottom of the top cover (11). The two air outlet opening and closing mechanisms (4) are fixedly connected to the two sliding baffles (3) respectively. The negative pressure chamber (13) has two symmetrically arranged air inlet opening and closing mechanisms (5) that are fixedly connected to its outer side wall. The air inlet opening and closing mechanisms (5) are slidably connected to the air duct partition (18). The air intake hole (12) is provided with an air intake opening and closing mechanism (6).

2. A handheld aroma diffuser with a negative pressure triggering structure according to claim 1, characterized in that, The ventilation slot (2) is located on one side of the air intake hole (12). A ventilation mesh plate (21) is fixedly connected to the inner wall of the ventilation slot (2). Four rectangular positioning blocks (22) are fixedly connected to the upper surface of the ventilation mesh plate (21). A fragrance chip (23) is arranged between the four positioning blocks (22). The fragrance chip (23) abuts against the upper surface of the ventilation mesh plate (21). A cover plate (24) is snapped onto the upper surface of the top cover (11). The cover plate (24) is located above the ventilation slot (2). The cover plate (24) is located on one side of the air intake hole (12) and its horizontal height is lower than the horizontal height of the top of the air intake hole (12). Multiple evenly distributed air outlets (25) are opened on the upper surface of the cover plate (24). Two symmetrically arranged pressure strips (26) are fixedly connected to the bottom of the cover plate (24). The pressure strips (26) abut against the upper surface of the fragrance chip (23).

3. A handheld aroma diffuser with a negative pressure triggering structure according to claim 1, characterized in that, The sensing end of the negative pressure sensor (15) is located inside the negative pressure chamber (13). The negative pressure sensor (15) is electrically connected to the fan (16) and the negative ion generator (17).

4. A handheld aroma diffuser with a negative pressure triggering structure according to claim 1, characterized in that, The air outlet opening and closing mechanism (4) includes a first cylinder (41), which is fixedly installed on one side of the negative pressure chamber (13). An installation collar (42) is fixedly sleeved on the telescopic end of the first cylinder (41). The first cylinder (41) is fixedly connected to the bottom of the top cover (11) through the installation collar (42). A Z-shaped transmission rod (43) is fixedly connected to the telescopic end of the first cylinder (41) away from the negative pressure chamber (13). A first return spring (44) is slidably sleeved on the telescopic end of the first cylinder (41). The two ends of the first return spring (44) abut against the sides of the first cylinder (41) body and the Z-shaped transmission rod (43) that are close to each other. A vertical rod (45) is fixedly connected to the end of the Z-shaped transmission rod (43) away from the first cylinder (41). The vertical rod (45) is fixedly connected to the bottom of the sliding cover (3).

5. A handheld aroma diffuser with a negative pressure triggering structure according to claim 4, characterized in that, The first reset spring (44) is set in a compressed state.

6. A handheld aroma diffuser with a negative pressure triggering structure according to claim 1, characterized in that, The air intake opening and closing mechanism (5) includes a second cylinder (51), which is fixedly installed on one side of the negative pressure chamber (13). A limiting collar (52) is fixedly sleeved on the telescopic end of the second cylinder (51). A second return spring (53) is slidably sleeved on the telescopic end of the second cylinder (51). The two ends of the second return spring (53) abut against the sides of the body of the second cylinder (51) and the limiting collar (52) respectively. The telescopic end of the second cylinder (51) is slidably installed on one side of the air duct partition (18). A closing baffle (54) is fixedly connected to the end of the telescopic end of the second cylinder (51) away from the negative pressure chamber (13). An air inlet (55) is opened on the outer wall of the protective shell (1). The closing baffle (54) is located in the air inlet (55).

7. A handheld aroma diffuser with a negative pressure triggering structure according to claim 6, characterized in that, The second reset spring (53) is set in a compressed state, and the outer wall size of the closing baffle (54) is adapted to the inner wall size of the air inlet (55).

8. A handheld aroma diffuser with a negative pressure triggering structure according to claim 1, characterized in that, The air intake opening and closing mechanism (6) includes a fixed ring (61), which is fixedly connected to the inner wall of the air intake hole (12). The upper surface of the fixed ring (61) is movably hinged with two symmetrically arranged semi-circular baffles (62). The top cover (11) has two symmetrically arranged arc-shaped slots (63) inside. Arc-shaped rods (64) are slidably inserted into each of the two arc-shaped slots (63). Arc-shaped return springs (65) are provided inside the arc-shaped slots (63). The two ends of the arc-shaped return springs (65) abut against the arc-shaped rods (64) and the inner wall of the top cover (11) respectively. The end of the arc-shaped rods (64) away from the arc-shaped return springs (65) is fixedly connected to the upper surface of the semi-circular baffles (62). The arc-shaped return springs (65) are in a compressed state.

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