Cooling and heating bladeless fan

Abstract

The cooling and heating bladeless fan comprises an air inlet base, a fan motor assembly, a front air inlet, an air outlet shell and an air outlet, a movable air deflector is arranged on the left side of the air outlet, a fixed air deflector is arranged on the right side of the air outlet, and the movable air deflector and the fixed air deflector are matched to form a horn shape; a front movable cover plate capable of sliding up and down is arranged on the front side of the air inlet base, and a transmission device is arranged between the front movable cover plate and the movable air deflector; when the front movable cover plate slides upwards to close the front air inlet, the movable air guide plate can be driven to rotate through the transmission device to be matched with the fixed air guide plate to close the air outlet. The air inlet and the air outlet are closed when the fan is idle, dust is effectively prevented, and the service life of internal elements is prolonged; the two air ports can be synchronously closed by sliding the cover plate, operation is easy and convenient, and user experience is improved; the trumpet-shaped air guide structure can optimize air flow guide, and air supply is more concentrated and smoother.

Description

Technical Field

[0001] This invention relates to the field of bladeless fan technology, and particularly to a bladeless fan for both heating and cooling. Background Technology

[0002] Bladeless fans are widely used in heating and cooling applications due to their safety and gentle airflow. While existing bladeless fans can regulate both airflow and temperature, they still have some design shortcomings: The air inlet and outlet of most bladeless fans are exposed for extended periods, allowing dust and debris to easily enter the unit when not in use. This not only makes cleaning difficult but can also affect the performance and lifespan of the internal motor. Furthermore, the lack of an effective sealing structure for the air inlet and outlet makes it impossible to ensure internal cleanliness when the product is stored or idle for extended periods. Therefore, it is necessary to design a new type of bladeless fan that combines heating and cooling functions with effective dust prevention. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the problems existing in the prior art. To this end, the present invention proposes a bladeless fan for both heating and cooling that can seal the air inlet and outlet to prevent dust.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A bladeless fan for both heating and cooling includes an air inlet base, a fan motor assembly housed within the air inlet base, a front air inlet on the front side of the air inlet base, an air outlet housing on one side of the air inlet base, an air outlet on the front side of the air outlet housing, a movable air guide plate rotatably mounted on the left side of the air outlet, and a fixed air guide plate fixedly mounted on the right side of the air outlet, wherein the cross-sectional shape of the movable air guide plate and the fixed air guide plate when engaged is trumpet-shaped, and a front movable cover plate that slides up and down on the front side of the air inlet base, wherein a transmission device is provided between the front movable cover plate and the movable air guide plate, and when the front movable cover plate slides to close the front air inlet, the transmission device can drive the movable air guide plate to rotate, thereby closing the air outlet.

[0006] In some embodiments, the front air inlet is located at the upper end of the front side of the air inlet base, and there are symmetrical slide rails on the left and right sides of the front side of the air inlet base, with the two ends of the front movable cover plate sliding on the two slide rails respectively.

[0007] In some embodiments, a rotating shaft is provided on the movable air guide plate, the rotating shaft being rotatably located on the front side of the air outlet housing. The transmission device includes a drive top plate provided on the front movable cover plate, a transmission gear is provided on the rotating shaft, and a guide seat is also provided on the air outlet housing. A transmission rack that can mesh with the transmission gear slides left and right on the guide seat. An inner limit seat and an outer limit seat are respectively provided at both ends of the transmission rack. The inner limit seat and the outer limit seat are used to limit the movement position of the transmission rack on the guide seat. An angle limit seat is also provided on the air outlet housing. When the movable air guide plate abuts against the angle limit seat, it is in an unfolded state. A first spring is connected between the inner limit seat and the guide seat. A drive inclined surface is provided at the upper end of the drive top plate. The drive inclined surface can push the inner limit seat, causing its transmission rack to move outward on the guide seat.

[0008] In some embodiments, a locking device is also provided on the air inlet base, the locking device being used to lock the front movable cover so that the front movable cover remains in a closed air inlet shape.

[0009] In some embodiments, the locking device includes a movable groove located on the front side of the upper end of the air inlet base, a locking block sliding back and forth in the movable groove, a second spring being provided between the locking block and the inner wall of the movable groove, a toggle block being provided on the locking block, the toggle block extending above the air inlet base, and a locking hole for the locking block to be inserted into being provided on the front movable cover plate.

[0010] In some embodiments, the air outlet housing is arched, comprising a transverse housing and vertical housings at both ends of the transverse housing. The air inlet base is located between the two vertical housings and communicates with both vertical housings. An air supply channel is provided in each of the two vertical housings. The air supply channel is composed of a heat-insulating front housing and a heat-insulating rear housing. The air outlet is located on the heat-insulating front housing. A heating component is also provided in the air supply channel.

[0011] In some embodiments, a rear air inlet is provided on the rear side of the air inlet base, and a rear movable cover plate that can be slidably closed or opened is also provided on the rear side of the air inlet base.

[0012] In some embodiments, handles are provided on both the front movable cover and the rear movable cover.

[0013] In some embodiments, a base is further provided at the lower end of the air inlet base, and the air inlet base is rotatably mounted on the base.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. By setting a front movable cover and a movable air guide plate, and using a transmission device to link the two together; when the front movable cover slides upward to close the front air inlet, the transmission device can drive the movable air guide plate to rotate, so that the fixed air guide plate closes the air outlet; this design ensures that when the fan is not in use, both the air inlet and the air outlet are in a closed state, which can effectively prevent dust and foreign objects from entering the machine body and extend the service life of internal components such as the fan motor.

[0016] 2. By simply sliding the front movable cover, both the inlet and outlet of the air can be closed simultaneously. The design of the transmission device makes operation simple and quick, improving the user experience, without the need to operate the inlet and outlet separately.

[0017] 3. When the movable air guide plate and the fixed air guide plate at the air outlet are combined, their cross-sectional shape is trumpet-shaped. This structure helps to optimize the airflow direction, making the air outlet more concentrated and smooth, and improving the air delivery effect. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the bladeless fan of the present invention.

[0019] Figure 2 For the present invention Figure 1 Enlarged diagram of point A.

[0020] Figure 3 This is a front view schematic diagram of the bladeless fan of the present invention.

[0021] Figure 4 For the present invention Figure 3 Schematic diagram of section AA.

[0022] Figure 5 For the present invention Figure 4 Enlarged diagram of point B.

[0023] Figure 6 This is a cross-sectional view of the air outlet when the movable air guide plate of the present invention is opened.

[0024] Figure 7 This is a cross-sectional view of the structure when the movable air guide plate of the present invention closes the air outlet.

[0025] Figure 8 This is a partial structural schematic diagram of the transmission device of the present invention. Detailed Implementation

[0026] The following detailed description provides various embodiments or examples for carrying out the present invention. Of course, these are merely embodiments or examples and are not intended to be limiting. Additionally, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. These repetitions are for the purpose of simple and clear description of the invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0027] like Figures 1-8 The bladeless fan shown includes an air inlet base 1, a fan motor assembly 3 housed within the air inlet base 1, a front air inlet 4 on the front side of the air inlet base 1, an air outlet housing 2 on one side of the air inlet base 1, an air outlet 5 on the front side of the air outlet housing 2, a movable air guide plate 6 rotatably mounted on the left side of the air outlet 5, and a fixed air guide plate 7 fixedly mounted on the right side. The cross-sectional shape of the movable air guide plate 6 and the fixed air guide plate 7 when they are engaged is trumpet-shaped. A front movable cover plate 8 also slides up and down on the front side of the air inlet base 1. A transmission device is provided between the front movable cover plate 8 and the movable air guide plate 6. When the front movable cover plate 8 slides to close the front air inlet 4, the transmission device can drive the movable air guide plate 6 to rotate, thereby closing the air outlet 5.

[0028] When the fan is in operation, the front movable cover 8 is in the open position after sliding down. At this time, the front air inlet 4 on the front side of the air inlet base 1 remains open, providing a channel for airflow. Activating the fan motor assembly 3 inside the air inlet base 1 generates negative pressure, drawing outside air into the air inlet base 1 through the open front air inlet 4. The airflow flows from the air inlet base 1 to the air outlet housing 2 on one side, and finally exits through the air outlet 5 on the front side of the air outlet housing 2. At this time, the movable air guide plate 6 on the left side of the air outlet 5 is in a cooperative state with the fixed air guide plate 7 on the right side. Both have a trumpet-shaped cross-section, which guides the exhaust airflow, optimizes the airflow direction, expands the airflow coverage area, and improves the cooling and heating effects.

[0029] When the fan stops working and dust prevention is required, the front movable cover 8 can be manually or controlled via the drive mechanism to slide upwards along the front side of the air inlet base 1 until it completely covers and closes the front air inlet 4. During this sliding process, the front movable cover 8 converts its linear sliding motion into rotational motion through the transmission device between it and the movable air guide plate 6, driving the movable air guide plate 6 to rotate around its rotation axis. As the movable air guide plate 6 rotates, its engagement with the fixed air guide plate 7 gradually changes, until the movable air guide plate 6 finally rotates to a position that completely blocks the air outlet 5, thus closing the air outlet 5. In this way, through the linkage of the front movable cover 8 and the movable air guide plate 6, the front air inlet 4 and the air outlet 5 are simultaneously closed, effectively preventing dust and debris from entering the fan and protecting the internal components.

[0030] When the fan is restarted, the front movable cover 8 is slid in the reverse direction to open the front air inlet 4. At the same time, the movable air guide plate 6 is driven to rotate in the reverse direction through the transmission device, which releases the blockage of the air outlet 5 and restores the horn-shaped engagement state. The fan can then normally draw in airflow and output cold or warm air to complete one complete working cycle.

[0031] Furthermore, the front air inlet 4 is located at the upper end of the front side of the air inlet base 1, and there are symmetrical slide rails 21 on the left and right sides of the front side of the air inlet base 1. The two ends of the front movable cover plate 8 slide on the two slide rails 21 respectively.

[0032] A stable sliding support structure is provided for the front movable cover plate 8. The two ends of the front movable cover plate 8 are respectively embedded in the two slide rails 21, so that the front movable cover plate 8 can only slide vertically along the extension direction of the slide rail 21, which restricts its lateral displacement and ensures that the sliding process is smooth and without jamming.

[0033] See Figures 1-3 , Figures 6-8 As shown, a rotating shaft 31 is provided on the movable air guide plate 6. The rotating shaft 31 is rotatably located on the front side of the air outlet housing 2. The transmission device includes a drive top plate 32 provided on the front movable cover plate 8. A transmission gear 33 is provided on the rotating shaft 31. A guide seat 34 is also provided on the air outlet housing 2. A transmission rack 35 that can mesh with the transmission gear 33 slides left and right on the guide seat 34. An inner limit seat 36 and an outer limit seat 37 are respectively provided at both ends of the transmission rack 35. The limiting seat 36 and the outer limiting seat 37 are used to limit the movement of the transmission rack 35 on the guide seat 34. An angle limiting seat 38 is also provided on the air outlet housing 2. When the movable air guide plate 6 abuts against the angle limiting seat 38, it is in an unfolded state. A first spring 39 is connected between the inner limiting seat 36 and the guide seat 34. A driving inclined surface 310 is provided at the upper end of the driving top plate 32. The driving inclined surface 310 can push the inner limiting seat 36, causing its transmission rack 35 to move outward on the guide seat 34.

[0034] First, the movable air guide plate 6 is rotatably mounted on the front side of the air outlet housing 2 via a rotating shaft 31. The rotating shaft 31 provides a fixed support point for the rotation of the movable air guide plate 6, ensuring that the movable air guide plate 6 can rotate stably around the rotating shaft 31, realizing the opening and closing switching of the air outlet 5, and at the same time providing a carrier for the installation of the transmission gear 33. The various components of the transmission device work together to complete the power transmission. Among them, the guide seat 34 is fixed on the air outlet housing 2, providing guidance and support for the left and right sliding of the transmission rack 35. The transmission rack 35 can move smoothly along the extension direction of the guide seat 34 and meshes with the transmission gear 33 on the rotating shaft 31. The inner limit seat 36 and the outer limit seat 37 provided at both ends of the transmission rack 35 are used to limit the movement stroke of the transmission rack 35 on the guide seat 34, to prevent it from sliding excessively and causing it to disengage from the transmission gear 33 or damage the components, thus ensuring the reliability of the transmission structure.

[0035] An angle limiting seat 38 is provided on the air outlet housing 2 to limit the unfolded position of the movable air guide plate 6: when the movable air guide plate 6 abuts against the angle limiting seat 38, it is in a fully unfolded state. At this time, it cooperates with the fixed air guide plate 7 to form a trumpet-shaped cross section to meet the air guiding requirements when the fan is working; at the same time, the first spring 39 connecting the inner limiting seat 36 and the guide seat 34 is in a natural extension and contraction state, providing a reset force for the transmission rack 35 to ensure the initial position of the transmission structure is stable when not in operation.

[0036] When the fan stops working and the air outlet 5 needs to be closed, the front movable cover 8 slides upward along the slide rail 21, and the driving inclined surface 310 at its upper end moves upward synchronously. After the driving inclined surface 310 contacts the inner limit seat 36, it pushes the inner limit seat 36 through the guiding action of the inclined surface, driving the transmission rack 35 to move outward along the guide seat 34. During this process, the first spring 39 is compressed and stores the reset elastic force; at the same time, the transmission gear 33 meshing with the transmission rack 35 rotates with the movement of the rack, driving the rotating shaft 31 and the movable air guide plate 6 to rotate around the rotating shaft 31, gradually disengaging from the limit of the angle limit seat 38, until the movable air guide plate 6 rotates to the position of completely closing the air outlet 5. At this time, the inner limit seat 36 abuts against the guide seat 34, restricting the transmission rack 35 from continuing to move outward, completing the closure of the air outlet 5, which is synchronized with the action of the front movable cover 8 to close the front air outlet 4.

[0037] When the fan restarts and the air outlet 5 needs to be opened, the front movable cover 8 is pushed downwards in the opposite direction, and the driving inclined surface 310 gradually disengages from the pushing action on the inner limit seat 36. The compressed first spring 39 releases its elasticity, pushing the inner limit seat 36 and the transmission rack 35 to reset inwards along the guide seat 34. The transmission rack 35 drives the transmission gear 33 to rotate in the opposite direction, thereby driving the movable air guide plate 6 to rotate in the opposite direction around the rotating shaft 31 until the movable air guide plate 6 abuts against the angle limit seat 38, restoring its unfolded shape. It cooperates with the fixed air guide plate 7 to form a trumpet-shaped air guide structure, ensuring that the fan can output air normally.

[0038] See Figure 1 , Figure 4 , Figure 5 As shown, a locking device is also provided on the air inlet base 1. The locking device is used to lock the front movable cover 8 so that the front movable cover 8 remains in the form of closing the front air inlet 4.

[0039] The locking device includes a movable groove 51 located on the front side of the upper end of the air inlet base 1. A locking block 52 slides back and forth in the movable groove 51. A second spring 53 is provided between the locking block 52 and the inner wall of the movable groove 51. A toggle block 54 is also provided on the locking block 52. The toggle block 54 extends above the air inlet base 1. A locking hole 55 is provided on the front movable cover plate 8 for the locking block 52 to be inserted.

[0040] The locking device consists of various components that work together to complete the locking function. The movable groove 51 is located on the front side of the upper end of the air inlet base 1, providing the locking block 52 with installation space and guide support for sliding back and forth. The locking block 52 can slide smoothly back and forth along the extension direction of the movable groove 51. The second spring 53 connected between the locking block 52 and the inner wall of the movable groove 51 is in a natural extension state under normal conditions, providing a forward elastic force to the locking block 52 and ensuring that the locking block 52 maintains its initial extended state when there is no external force intervention. The toggle block 54 is fixed on the locking block 52 and extends above the air inlet base 1, making it convenient for the operator to manually toggle the locking block 52 to achieve the unlocking operation. The locking hole 55 provided on the front movable cover 8 matches the position and size of the locking block 52 and is used for the insertion of the locking block 52 to achieve the locking and limiting of the front movable cover 8.

[0041] When the fan stops working and the front movable cover 8 needs to be locked to keep the inlet 4 closed, the operator pushes the front movable cover 8 upward along the slide rail 21 until the front movable cover 8 completely closes the inlet 4. At this time, the locking hole 55 on the front movable cover 8 is exactly aligned with the locking block 52 in the movable groove 51. Since the second spring 53 provides a forward elastic force under normal conditions, it will push the locking block 52 forward along the movable groove 51 until the front end of the locking block 52 is inserted into the locking hole 55. At this time, the locking block 52 limits the front movable cover 8, preventing it from sliding downward along the slide rail 21, so that the front movable cover 8 can stably maintain the closed inlet 4. At the same time, the movable air guide plate 6 also maintains the closed outlet 5 under the action of the transmission device, realizing a stable seal between the inlet and outlet, and effectively preventing accidental contact that could cause the cover to slide or the seal to fail.

[0042] See Figure 1 , Figure 3 , Figures 6-7 As shown, the air outlet housing 2 is arched, including a horizontal housing 61 and vertical housings 62 located at both ends of the horizontal housing 61. The air inlet base 1 is located between the two vertical housings 62 and is connected to both vertical housings 62 respectively. An air supply channel is provided in each of the two vertical housings 62. The air supply channel is composed of a heat-insulating front housing 63 and a heat-insulating rear housing 64. The air outlet 5 is located on the heat-insulating front housing 63. A heating component 65 is also provided in the air supply channel.

[0043] When the fan is in warm air mode, the heating component 65 starts simultaneously. The outside air drawn in by the fan motor component 3 is processed by the air inlet base 1 and enters the air delivery channel in the vertical shell 62. During the flow of air in the air delivery channel, it comes into full contact with the heating component 65 after it is started and is heated to the set temperature to form warm air. Since the air delivery channel is composed of the heat-insulating front shell 63 and the heat-insulating rear shell 64, the heat loss of warm air during the delivery process can be effectively reduced, ensuring that the warm air is stably delivered to the air outlet 5. Then, the air is gathered and guided by the funnel-shaped structure of the movable air guide plate 6 and the fixed air guide plate 7 to achieve a uniform and warm air delivery effect.

[0044] In this invention, a rear air inlet 71 is provided on the rear side of the air inlet base 1, and a rear movable cover plate 72 that can slide up and down on the rear side of the air inlet base 1 to close or open the rear air inlet 71.

[0045] A rear air inlet 71 is provided on the rear side of the air inlet base 1. It has the same structure as the original front air inlet 4 and forms a bidirectional air intake structure, which can increase the air intake volume, reduce the air intake resistance, and ensure that the fan motor assembly 3 can quickly draw in sufficient air when it is running. This provides sufficient guarantee for the generation and output of cold and warm airflow, and avoids problems such as weak air output and poor cooling and heating effect caused by insufficient air intake from a single air inlet. It is especially suitable for use in large spaces.

[0046] Handles 81 are provided on both the front movable cover 8 and the rear movable cover 72. The handles 81 provide a clear point of force for the sliding operation of the front movable cover 8 and the rear movable cover 72. The operator can easily push the cover to slide up and down by holding the handles 81 to realize the quick opening and closing of the air inlet. Compared with the handleless design, it avoids the problems of slipping and inconvenience in applying force when sliding, and the operation is more labor-saving and convenient.

[0047] A base 91 is also provided at the lower end of the air inlet base 1. The air inlet base 1 is rotatably mounted on the base 91. The air inlet base 1 can rotate around the base 91, driving the air outlet housing 2 to rotate synchronously. This allows the air outlet direction of the air outlet 5 to be flexibly adjusted, breaking the limitation of a fixed air outlet direction. Users can adjust the air outlet direction to any angle according to their needs, achieving uniform air supply throughout the house and avoiding uneven heating and cooling in local areas. It is especially suitable for use in large spaces such as living rooms and bedrooms, greatly improving the heating and cooling experience.

[0048] Based on the accompanying drawings and the foregoing illustrations and descriptions, the basic principles and main features of the present invention, as well as its advantages, those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bladeless fan for both heating and cooling, characterized in that: It includes an air inlet base (1), a fan motor assembly (3) is provided inside the air inlet base (1), a front air inlet (4) is provided on the front side of the air inlet base (1), an air outlet housing (2) is provided on one side of the air inlet base (1), an air outlet (5) is provided on the front side of the air outlet housing (2), a movable air guide plate (6) is rotatably provided on the left side of the air outlet (5), and a fixed air guide plate (7) is fixedly provided on the right side. The cross-sectional shape of the movable air guide plate (6) and the fixed air guide plate (7) is trumpet-shaped when they cooperate. A front movable cover plate (8) is also slidably provided on the front side of the air inlet base (1). A transmission device is provided between the front movable cover plate (8) and the movable air guide plate (6). When the front movable cover plate (8) slides to close the front air inlet (4), the movable air guide plate (6) can be driven to rotate through the transmission device to close the air outlet (5).

2. The bladeless fan for both heating and cooling according to claim 1, characterized in that: The front air inlet (4) is located at the upper end of the front side of the air inlet base (1). There are slide rails (21) symmetrically arranged on the left and right sides of the front side of the air inlet base (1). The two ends of the front movable cover plate (8) slide on the two slide rails (21) respectively.

3. A bladeless fan for both heating and cooling according to claim 1, characterized in that: A rotating shaft (31) is provided on the movable air guide plate (6). The rotating shaft (31) is rotatably located on the front side of the air outlet housing (2). The transmission device includes a drive top plate (32) provided on the front movable cover plate (8). A transmission gear (33) is provided on the rotating shaft (31). A guide seat (34) is also provided on the air outlet housing (2). A transmission rack (35) that can mesh with the transmission gear (33) slides left and right on the guide seat (34). An inner limit seat (36) and an outer limit seat (37) are respectively provided at both ends of the transmission rack (35). The seat (36) and the outer limit seat (37) are used to limit the movement of the transmission rack (35) on the guide seat (34). An angle limit seat (38) is also provided on the air outlet housing (2). When the movable air guide plate (6) abuts against the angle limit seat (38), it is in an unfolded state. A first spring (39) is connected between the inner limit seat (36) and the guide seat (34). A driving inclined surface (310) is provided at the upper end of the driving top plate (32). The driving inclined surface (310) can push the inner limit seat (36) to make its transmission rack (35) move outward on the guide seat (34).

4. A bladeless fan for both heating and cooling according to claim 1, characterized in that: A locking device is also provided on the air inlet base (1). The locking device is used to lock the front movable cover (8) so that the front movable cover (8) remains in the form of closing the front air inlet (4).

5. A bladeless fan for both heating and cooling according to claim 4, characterized in that: The locking device includes a movable groove (51) located on the front side of the upper end of the air inlet base (1), a locking block (52) sliding back and forth in the movable groove (51), a second spring (53) being provided between the locking block (52) and the inner wall of the movable groove (51), a toggle block (54) being provided on the locking block (52), the toggle block (54) extending above the air inlet base (1), and a locking hole (55) for the locking block (52) to be inserted being provided on the front movable cover plate (8).

6. A bladeless fan for both heating and cooling according to claim 1, characterized in that: The air outlet housing (2) is arched, including a horizontal housing (61) and vertical housings (62) located at both ends of the horizontal housing (61). The air inlet base (1) is located between the two vertical housings (62) and is connected to the two vertical housings (62) respectively. An air supply channel is provided in both vertical housings (62). The air supply channel is composed of a heat-insulating front housing (63) and a heat-insulating rear housing (64). The air outlet (5) is located on the heat-insulating front housing (63). A heating component (65) is also provided in the air supply channel.

7. A bladeless fan for both heating and cooling according to claim 1, characterized in that: A rear air inlet (71) is provided on the rear side of the air inlet base (1), and a rear movable cover plate (72) that can close or open the rear air inlet (71) is also slidably mounted on the rear side of the air inlet base (1).

8. A bladeless fan for both heating and cooling according to claim 7, characterized in that: Handles (81) are provided on both the front movable cover plate (8) and the rear movable cover plate (72).

9. A bladeless fan for both heating and cooling according to claim 1, characterized in that: A base (91) is also provided at the lower end of the air inlet base (1), and the air inlet base (1) is rotatably mounted on the base (91).

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