Position indicating device for a double power transfer switch and double power transfer switch

Abstract

The embodiment of the present disclosure provides a position indicating device for a double power transfer switch and the double power transfer switch. The position indicating device comprises an indicating piece arranged inside a shell of the double power transfer switch; and a driving piece connected to an action mechanism of the double power transfer switch and adapted to abut against the indicating piece and push the indicating piece to rotate around a rotation axis during at least an action period of the action mechanism to the closed position, so as to switch a part of the indicating piece aligned with a viewing window of the shell, and the driving piece is spaced apart from the indicating piece by a predetermined distance during a period when the action mechanism is in the open energy storage position. Thus, the working state of the double power transfer switch can be indicated.

Description

Technical Field

[0001] The exemplary embodiments disclosed herein generally relate to the field of electrical equipment, and particularly to position indication devices and dual power transfer switches for dual power transfer switches. Background Technology

[0002] A dual power transfer switch is an electrical device used for automatic or manual switching between two different power sources, primarily used in applications requiring high power supply reliability. It can detect parameters such as voltage and frequency of both power sources. When one power source fails or experiences a power outage, it can quickly switch the load to the other normal power source, ensuring continuous power supply and effectively preventing equipment shutdowns and production interruptions caused by power outages.

[0003] During the switching between two power sources, the user cannot intuitively determine the current connection status of the dual power transfer switch with the two power sources, which causes inconvenience to the user. Utility Model Content

[0004] In a first aspect of this disclosure, a position indicating device for a dual-power transfer switch is provided. The position indicating device includes: an indicator element disposed inside the housing of the dual-power transfer switch; and a drive element connected to an actuating mechanism of the dual-power transfer switch, adapted to abut against and push the indicator element about a rotation axis at least during operation of the actuating mechanism in the closed position, thereby switching the portion of the indicator element aligned with the viewing window of the housing, wherein the drive element is spaced apart from the indicator element by a predetermined distance during operation of the actuating mechanism in the open energy storage position.

[0005] In some embodiments, the indicator includes: a coupling portion rotatably connected to the housing about a rotation axis; an indicator portion connected to the coupling portion and extending in a direction perpendicular to the rotation axis, the indicator portion being partially aligned with the viewing window of the housing; and an extension portion connected to the coupling portion and protruding from the coupling portion in a direction perpendicular to the rotation axis.

[0006] In some embodiments, the direction in which the indicator extends has a predetermined non-zero angle with the direction in which the extension protrudes from the coupling portion.

[0007] In some embodiments, the drive includes: a mounting plate connected to the main shaft of the actuating mechanism and connected to the output shaft of the actuating mechanism to rotate about the main shaft with the output shaft; and a drive arm formed on the mounting plate in a direction perpendicular to the main shaft, the drive arm being adapted to contact the extension during the actuating mechanism's movement toward the closed position and to push the indicator to rotate.

[0008] In some embodiments, the indicator further includes at least one status indicator surface, which is disposed at the end of the indicator portion away from the coupling portion and is adapted to be exposed to the observation window or shielded by the housing as the indicator portion rotates.

[0009] In some embodiments, at least one status indicator surface includes: a break indicator surface adapted to be aligned with the observation window during the break of the actuation mechanism; and a pair of closed indicator surfaces disposed at both ends of the break indicator surface along the rotation direction of the indicator, and one of the closed indicator surfaces is adapted to be aligned with the observation window during the conduction of the actuation mechanism.

[0010] In some embodiments, the position indicating device further includes: a limiting protrusion connected to the indicator and protruding in a direction parallel to the rotation axis; and a side plate connected to the housing and including: a limiting hole adapted to receive the limiting protrusion to constrain the rotation angle of the indicator.

[0011] In some embodiments, the position indicating device further includes a return spring disposed between the housing and the indicator to provide an elastic force to the indicator for rotating the indicator during disengagement of the actuation mechanism.

[0012] In some embodiments, the return spring is arranged to interact with the side of the limiting protrusion to actuate the indicator.

[0013] In some embodiments, the contour of the limiting hole is formed as an arc segment centered on the axis of the spindle.

[0014] According to some embodiments of the position indicating device disclosed herein, a drive member coupled to the operating mechanism of the dual power transfer switch actuates the indicator, allowing it to be driven and rotated relative to the housing during the closing of the dual power transfer switch. This aligns different portions of the indicator on the indicator with the observation window of the housing. The user can observe the aligned portions of the indicator through the observation window to determine the current operating state of the dual power transfer switch. In this manner, the service life of the position indicating device can be extended, and the accuracy of the position indicating the state of the dual power transfer switch can be improved.

[0015] In a second aspect of this disclosure, a dual-power transfer switch is provided. The dual-power transfer switch includes: a housing including an observation window; a pair of actuating mechanisms; rotatably connected within the housing; and a pair of position indicating devices according to the first aspect of this disclosure, each coupled to the pair of actuating mechanisms.

[0016] It should be understood that the content described in this content section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0017] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0018] Figure 1 A schematic diagram of the internal structure of a dual power transfer switch according to some embodiments of the present disclosure is shown, wherein the first actuating mechanism is in the closed, non-energy-storing position and the second actuating mechanism is in the open, non-energy-storing position;

[0019] Figure 2 A schematic diagram of the internal structure of a dual power supply transfer switch according to some embodiments of the present disclosure is shown, wherein the first actuating mechanism is in the closing energy storage position and the second actuating mechanism is in the opening energy storage position;

[0020] Figure 3 A schematic diagram of the internal structure of a dual power transfer switch according to some embodiments of the present disclosure is shown, wherein the first actuating mechanism is in the open, non-energy-storage position and the second actuating mechanism is in the closed, non-energy-storage position.

[0021] Figure 4 A schematic diagram of the internal structure of a dual power transfer switch according to some embodiments of the present disclosure is shown, wherein the first actuating mechanism is located in the open energy storage position and the second actuating mechanism is located in the closed energy storage position;

[0022] Figure 5 A schematic diagram of the overall structure of an indicator according to some embodiments of the present disclosure is shown;

[0023] Figure 6 A schematic diagram of the structure of the status indication surface of an indicator according to some embodiments of the present disclosure is shown;

[0024] Figure 7 A schematic diagram showing the connection relationship between the indicator and the return spring according to some embodiments of the present disclosure is shown; and

[0025] Figure 8 A schematic diagram of a side panel structure according to some embodiments of the present disclosure is shown. Detailed Implementation

[0026] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0027] It should be noted that the headings of any section / subsection provided herein are not limiting. Various embodiments are described throughout this document, and embodiments of any type may be included under any section / subsection. Furthermore, embodiments described in any section / subsection may be combined in any way with any other embodiments described in the same section / subsection and / or different sections / subsections.

[0028] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "based on" should be understood as "at least partially based on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The term "some embodiments" should be understood as "at least some embodiments". Other explicit and implicit definitions may also be included below. The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0029] As briefly mentioned earlier, dual-power transfer switches typically include an indicator. This indicator is linked to the switch's operating mechanism and can move with it. Users can determine the switch's status based on the indicator's current position or the information it indicates. Traditional position indicators connected to the operating mechanism are easily damaged by the rapid movement of the mechanism.

[0030] This disclosure provides a position indicator for a dual-power transfer switch and a dual-power transfer switch, addressing or at least partially addressing the aforementioned problems or other potential problems existing in the conventional art. According to some embodiments of the position indicator, an indicator is actuated by a drive member connected to the operating mechanism of the dual-power transfer switch, allowing the indicator to be driven and rotated relative to the housing during switch closing. This aligns different portions of the indicator's pointing portion with the viewing window of the housing. The user can observe the aligned portions of the indicator through the viewing window, thereby determining the current operating state of the dual-power transfer switch. In this way, the service life of the position indicator can be extended, and the accuracy of the position indicator in indicating the state of the dual-power transfer switch can be improved.

[0031] Figures 1 to 4 A schematic diagram of the internal structure of a dual power supply transfer switch according to some embodiments of the present disclosure in different operating states is shown. (Reference) Figures 1 to 4 The dual power transfer switch generally includes a housing 1, an actuating mechanism arranged inside the housing 1, and a position indicator device arranged inside the housing 1. An observation window 11 is also provided on the side of the housing 1 facing the user, allowing the user to observe the current status of the position indicator device and determine the current operating status of the dual power transfer switch.

[0032] The dual power transfer switch includes a pair of actuating mechanisms. For ease of reference, the pair of actuating mechanisms will be referred to below as the first actuating mechanism 12 and the second actuating mechanism 13, respectively. The first actuating mechanism 12 and the second actuating mechanism 13 can be used to control the on / off switching of the main power supply and the backup power supply. Correspondingly, two position indicators are provided, corresponding to the first actuating mechanism 12 and the second actuating mechanism 13, respectively.

[0033] As mentioned above, the dual-power transfer switch has a pair of operating mechanisms associated with the primary power supply and the backup power supply, respectively. The dual-power transfer switch can switch between the primary and backup power supplies, meaning it can switch the load from being powered by the primary power supply to being powered by the backup power supply. To ensure stable operation of the load without power loss during power switching, the spring of the operating mechanism can be energy-stored, allowing the mechanism to quickly close or open under the spring's actuation. Therefore, for this type of dual-power transfer switch, the operating mechanism includes at least four operating states. The following will provide a more detailed explanation of the four operating states of the dual-power transfer switch and the indication of the position indicator in these four operating states, with reference to the accompanying drawings.

[0034] Figure 1 The first actuating mechanism 12 is in the closed, uncharged position, and the second actuating mechanism 13 is in the open, uncharged position. Under the action of the motor of the dual-power transfer switch, the actuating mechanisms gradually rotate and pass the dead point (also known as the critical point) before reaching the [position not specified]. Figure 2 The state shown. Figure 2 The first actuating mechanism 12 is in the closing energy storage position, and the second actuating mechanism 13 is in the opening energy storage position. The first actuating mechanism 12 can quickly open under the drive of an internal spring, and the second actuating mechanism 13 can quickly close under the drive of an internal spring. Figure 3 The first actuating mechanism 12 is in the open, uncharged position, and the second actuating mechanism 13 is in the closed, uncharged position. Under the action of the dual-power transfer switch motor, the actuating mechanisms gradually rotate and pass the dead point (also known as the critical point) before reaching the [position not specified]. Figure 4 The state shown. Figure 4 The first actuating mechanism 12 is in the open energy storage position, and the second actuating mechanism 13 is in the closed energy storage position. Figure 2 Similar to the structure shown, the first actuating mechanism 12 can quickly close the circuit under the drive of the internal spring, and the second actuating mechanism 13 can quickly open the circuit under the drive of the internal spring.

[0035] During the operation of the first actuating mechanism 12 and the second actuating mechanism 13, the position indicator can be triggered accordingly to change its display state in the observation window 11. The position indicator generally includes an indicator 2 and a drive member 3 arranged inside the housing 1 of the dual-power transfer switch. The indicator 2 is positioned near the observation window 11 of the housing 1 and is rotatably connected to the housing 1. The drive member 3 is connected to the actuating mechanism and can rotate around the main shaft 15 with the actuating mechanism. Thus, during the closing operation of the actuating mechanism, the drive member 3 can contact the indicator 2 and push the indicator 2 to rotate.

[0036] Figure 5 A schematic diagram of the overall structure of an indicator according to some embodiments of the present disclosure is shown. For example... Figure 5 As shown, the indicator 2 includes a coupling portion 21, an indicator portion 22, and an extension portion 23. The coupling portion 21 is rotatably connected to the housing 1, allowing the indicator 2 to rotate relative to the housing 1 about a rotation axis. The rotation axis may be parallel to the main shaft 15 of the actuating mechanism. The indicator portion 22 is connected to the coupling portion 21 and extends in a direction perpendicular to the rotation axis (hereinafter also referred to as the first radial direction). In some embodiments, the first radial direction may be towards the observation window 11 of the housing 1. For example, the first radial direction may be directly opposite the observation window, or it may be at a certain angle to the observation window. Thus, a portion of the indicator portion 22 may be aligned with the observation window 11, and the user can observe this portion of the indicator portion 22 through the indicator window. The extension portion 23 is connected to the coupling portion 21 and extends in a direction perpendicular to the rotation axis (hereinafter also referred to as the second radial direction). In some embodiments, the first radial direction extending from the indicator portion 22 and the second radial direction extending from the extension portion 23 have a predetermined angle. For example, the first radial direction and the second radial direction may have an angle of 180°; the first radial direction and the second radial direction may also have an angle of 150°, 135°, etc.

[0037] If the actuating mechanism performs a closing action, that is, the actuating mechanism rotates from the open energy-storing position to the closed non-energy-storing position, the driving member 3 can contact the extension 23 of the indicator 2 and push the indicator 2 to rotate around the rotation axis. At this time, the indicator 2 moves relative to the observation window 11, and the other parts of the indicator 22 are aligned with the observation window 11. The user can determine the current state of the dual power transfer switch based on the different parts of the indicator 22 exposed in the observation window 11.

[0038] When the actuating mechanism is in the open, uncharged position, the drive arm 32 of the drive member 3 is spaced apart from the extension 23 by a first distance. As the actuating mechanism continuously stores energy, if it reaches the open, charged position, the drive arm 32 rotates towards the extension 23 at a certain angle, and the drive arm 32 and the extension 23 are spaced apart by a predetermined distance. The predetermined distance is less than the first distance. This predetermined distance between the drive arm 32 and the extension 23 helps to reduce the impact force exerted by the drive arm 32 on the extension 23 during the closing action of the actuating mechanism, and reduces damage caused by excessive impact force during contact between the drive arm 32 and / or the extension 23.

[0039] Figure 6 A structural schematic diagram of the status indication surface of an indicator according to some embodiments of the present disclosure is shown. For example... Figure 6 As shown, in some embodiments, the indicator 2 further includes at least one status indicator surface formed on the side of the indicator portion 22 facing the observation window 11. When the dual power supply transfer switch is in the ON or OFF state, at least one status indicator surface can be switched within the observation window 11. For example, at least one indicator surface may include an OFF indicator surface 25. Indication information can be presented on the OFF indicator surface 25 by painting, engraving, or marking relevant text or symbols. When the actuator is in the OFF state (e.g., the actuator is in the open energy storage position or the open non-energy storage position), the OFF indicator surface 25 is aligned with the observation window 11, allowing the user to obtain the indication information from the observation window 11 and thus determine that the current actuator is in the OFF state. Similarly, the status indicator surface may also include a OFF indicator surface 26, which is adapted to be aligned with the observation window 11 during the actuator's ON state (e.g., the actuator is in the closed energy storage position or the closed non-energy storage position).

[0040] In some embodiments, the dual-power transfer switch includes a pair of actuating mechanisms and a pair of position indicating devices. At least one status indicating surface mentioned above may include a break indicating surface 25 and a pair of closed indicating surfaces 26. The pair of closed indicating surfaces 26 are respectively arranged at both ends of the break indicating surface 25 along the rotation direction of the indicator 2. This structure allows an indicator 2 of the same specification to be reused for position indication of the first actuating mechanism 12 and the second actuating mechanism 13. In this way, the reusability of the indicator 2 can be improved, thereby reducing production and assembly costs. In some embodiments, the pair of closed indicating surfaces 26 may also be distinguished by painting or engraving different markings.

[0041] Specifically, in some embodiments, a pair of closed indicator surfaces 26 includes a first closed indicator surface and a second closed indicator surface. The first closed indicator surface and the second closed indicator surface can be distinguished by different markings. If the indicator 2 is connected to the first actuating mechanism 12, the indicator 2 can rotate between a state in which the first closed indicator surface is aligned with the observation window 11 and a state in which the split indicator surface 25 is aligned with the observation window 11. If the indicator 2 is connected to the second actuating mechanism 13, the indicator 2 can rotate between a state in which the second closed indicator surface is aligned with the observation window 11 and a state in which the split indicator surface 25 is aligned with the observation window 11.

[0042] In some embodiments, the coupling portion 21, the extension portion 23, and the indicator portion 22 may be integrally formed, for example, by injection molding or other processes. In some other embodiments, the coupling portion 21, the extension portion 23, and the indicator portion 22 may also be fixed by snap-fitting, bonding, or other methods.

[0043] In some embodiments, the drive member 3 includes a mounting plate 31 and a drive arm 32 connected to the mounting plate 31. The mounting plate 31 is connected to the main shaft 15 of the actuating mechanism and is also connected to the output shaft 14 of the actuating mechanism. Thus, the mounting plate 31 can rotate about the main shaft 15 with the output shaft 14. The drive member 3 is arranged on one side of the mounting plate 31 and is adapted to extend in a direction perpendicular to the main shaft 15 (also referred to as the third radial direction). The drive member 3 can contact the extension 23 of the indicator 2 during the closing of the actuating mechanism and push the indicator 2 to rotate about the rotation axis.

[0044] In some embodiments, the mounting plate 31 may be sleeved on the spindle 15, thereby allowing the mounting plate 31 to rotate about the axis of the spindle 15 under the drive of the output shaft 14. In some other embodiments, the mounting plate 31 may also be partially arranged around the circumference of the spindle 15. For example, the mounting plate 31 may surround the spindle 15, and the angle of the mounting plate 31 around the spindle 15 may be greater than 180°. Exemplarily, the angle of the mounting plate 31 around the circumference of the spindle 15 may be 210°, 240°, etc. In this way, the mounting plate 31 can be connected to the spindle 15 by compressing the mounting plate to cause elastic deformation. Figure 7 A schematic diagram illustrating the connection relationship between the indicator and the return spring according to some embodiments of the present disclosure is shown. Figure 7As shown, in some embodiments, the position indicating device further includes a return spring 4 disposed between the housing 1 and the indicator 2. The return spring 4 can provide an elastic force to the indicator 2, allowing the indicator 2 to rotate to its initial state without being subjected to a pushing force from the drive member 3 (e.g., when the actuating mechanism is in the open-charge position or the open-uncharge position). In the initial state, the break indication surface 25 of the indicator 2 is aligned with the observation window 11. In some embodiments, the return spring 4 can abut against the side of the limiting protrusion 24, which will be described below, to connect with the indicator 2.

[0045] It should be understood that the return spring 4 is merely an exemplary reset mechanism. In other embodiments, other types of elastic elements, such as leaf springs, rubber elastomers, etc., may be used, or magnetic force (such as repulsion of magnets) or even gravity may be used to reset the indicator 2. Any biasing device capable of providing a reset force for the indicator 2 falls within the scope of this disclosure.

[0046] In some embodiments, a pair of position indicators of a dual power supply changeover switch may share a single return spring 4. Specifically, the return spring 4 is arranged between a pair of indicators 2 and is sleeved on a mounting post of the housing. The two ends of the return spring 4 abut against the sides of the limiting protrusions 24 of the pair of indicators 2, respectively. In this way, the return spring 4 can provide elastic force to each pair of indicators 2 to align the break indication surface 25 with the observation window 11, so that after the drive member 3 separates from the indicator 2, the indicator 2 can rotate to indicate only the breakage state of the corresponding actuating mechanism.

[0047] Figure 8 A schematic diagram of the side panel 5 structure according to some embodiments of the present disclosure is shown. For example... Figure 8 As shown and referenced Figure 4 In some embodiments, the position indicating device further includes a limiting protrusion 24. The limiting protrusion 24 is connected to the indicator 2 and protrudes in a direction parallel to the rotation axis. The limiting protrusion 24 can be connected at any suitable position of the indicator 2 off the rotation axis; for example, the limiting protrusion 24 can be connected to the indicator portion 22 or to the extension portion 23. The position indicating device also includes a side plate 5. The side plate 5 is arranged at one end of the indicator 2 along the rotation axis and is connected to the housing 1 of the dual power supply changeover switch. A limiting hole 51 is formed on the side plate 5, and the limiting protrusion 24 can be embedded in the limiting hole 51. During the rotation of the indicator 2 about the rotation axis, the wall of the limiting hole 51 can contact the limiting protrusion 24, thereby constraining the rotation angle of the indicator 2. In some embodiments, the wall of the limiting hole 51 is formed as an arc segment centered on the axis of the main shaft 15. Thus, the arc segment of the limiting hole 51 can match the rotation trajectory of the limiting protrusion 24 about the rotation axis, thereby improving the stability of the rotation of the indicator 2.

[0048] By precisely constraining the rotation endpoint of the indicator, it is ensured that the break indicator surface 25 and the close indicator surface 26 are accurately aligned with the observation window 11, avoiding incorrect indication information observed by the user due to excessive or insufficient rotation, thereby improving the accuracy and reliability of the indication. In addition, this limiting mechanism also provides a limit to the deformation of the return spring 4, preventing the return spring from plastic deformation or even failure due to excessive stretching or compression, and ensuring the long-term stability of the reset function.

[0049] Various implementations of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed implementations. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described implementations. The terminology used herein is chosen to best explain the principles, practical applications, or improvements to technology in the market, or to enable others skilled in the art to understand the various implementations disclosed herein.

Claims

1. A position indicator device for a dual-power transfer switch, characterized in that, include: Indicator (2) is arranged inside the housing (1) of the dual power supply changeover switch; as well as A drive member (3) is connected to the operating mechanism of the dual power transfer switch and is adapted to abut against the indicator (2) and push the indicator (2) to rotate about the rotation axis at least during the operation of the operating mechanism to the closed position, so as to switch the portion of the indicator (2) aligned with the observation window (11) of the housing (1), wherein the drive member (3) is spaced apart from the indicator (2) by a predetermined distance during the operation of the operating mechanism to the open energy storage position.

2. The position indicating device according to claim 1, characterized in that, The indicator (2) includes: The coupling part (21) is rotatably connected to the housing (1) about the rotation axis; An indicator (22), connected to the coupling (21) and extending in a direction perpendicular to the rotation axis, the indicator (22) being partially aligned with the observation window (11) of the housing (1); and An extension (23) is connected to the coupling portion (21) and protrudes from the coupling portion (21) in a direction perpendicular to the rotation axis.

3. The position indicating device according to claim 2, characterized in that, The direction in which the indicator (22) extends has a predetermined non-zero angle with the direction in which the extension (23) protrudes from the coupling (21).

4. The position indicating device according to claim 1, characterized in that, The driving component (3) includes: A mounting plate (31) is connected to the main shaft (15) of the actuating mechanism and to the output shaft (14) of the actuating mechanism, so as to rotate about the main shaft (15) with the output shaft (14); and A drive arm (32) is formed on the mounting plate (31) in a direction perpendicular to the main shaft (15). The drive arm (32) is adapted to contact the extension (23) and push the indicator (2) to rotate during the movement of the actuating mechanism toward the closed position.

5. The position indicating device according to claim 1, characterized in that, The indicator (2) further includes at least one status indicator surface, which is arranged at one end of the indicator (22) away from the coupling (21) and is adapted to be exposed to the observation window (11) or covered by the housing (1) as the indicator (22) rotates.

6. The position indicating device according to claim 5, characterized in that, The at least one status indication surface includes: The break indicator surface (25) is adapted to be aligned with the observation window (11) during the break of the actuation mechanism; and A pair of closed indicator surfaces (26) are arranged at both ends of the break indicator surface (25) along the rotation direction of the indicator (2), and one of the closed indicator surfaces (26) is adapted to be aligned with the observation window (11) during the activation of the actuation mechanism.

7. The position indicating device according to any one of claims 1-6, characterized in that, Also includes: A limiting protrusion (24) is connected to the indicator (2) and protrudes in a direction parallel to the rotation axis; as well as Side plate (5), connected to the housing (1), and comprising: A limiting hole (51) is adapted to accommodate the limiting protrusion (24) to constrain the rotation angle of the indicator (2).

8. The position indicating device according to claim 7, characterized in that, Also includes: A return spring (4) is arranged between the housing (1) and the indicator (2) to provide an elastic force to the indicator (2) for rotating the indicator (2) during the disengagement of the actuation mechanism.

9. The position indicating device according to claim 8, characterized in that, The reset spring (4) is arranged to interact with the side of the limiting protrusion (24) to push the indicator (2) to rotate.

10. The position indicating device according to claim 8, characterized in that, The contour of the limiting hole (51) is formed as an arc segment centered on the axis of the main shaft (15).

11. A dual-power transfer switch, characterized in that, include: The housing (1) includes an observation window (11); A pair of actuating mechanisms; rotatably connected within the housing (1); as well as A pair of position indicating devices according to any one of claims 1-10 are respectively connected to the pair of actuating mechanisms.

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