Interlocking mechanism of automatic transfer switch and automatic transfer switch

Abstract

The present disclosure relates to an interlocking mechanism of an automatic transfer switch and an automatic transfer switch. The automatic transfer switch has an automatic mode and two manual modes and includes: a base; a housing connected to the base and having an operating hole; two operating mechanisms installed on the base and driving the contact mechanism to open and close in the manual mode. The interlocking mechanism includes: a switching operating member, which is arranged on the housing and can move to three positions corresponding to the automatic and manual modes; a gate opening operating member, which is arranged on the housing and can drive the contact mechanism to open in the manual mode; a sliding member, which is movably connected to the switching operating member; a lever member, which is pivotally connected to the housing and movably connected to the sliding member, and has a locking posture for limiting the gate opening operating member in the automatic mode and an unlocking posture for avoiding the gate opening operating member in the manual mode; a stopper, which is pivotally connected to the housing and movably connected to the lever member, and has a stopping posture for blocking the operating hole in the automatic mode and an avoiding posture for making way for the operating hole in the manual mode.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic transfer switches, in particular to an interlocking mechanism of an automatic transfer switch and an automatic transfer switch. Background Art

[0002] The automatic transfer switch (ATS) is a key component of any emergency or backup power system, used to transfer the base load and distribution system from one power source to another. An existing automatic transfer switch has two modes: manual control opening and closing and automatic control opening and closing, and the conversion between the two modes is achieved through a switching mechanism. During the automatic control opening and closing, it is not expected that the user can interfere with the operation of the automatic transfer switch, while during the manual control opening and closing, it is hoped that the user's operation will not be affected. Therefore, it is necessary to design a joint defense mechanism to meet the technical requirements of interlocking between multiple modes of the automatic transfer switch. Utility Model Content

[0003] The utility model aims to provide an interlocking mechanism which is applied to an automatic transfer switch and can at least solve some of the above technical problems.

[0004] The utility model also aims to provide an automatic transfer switch using the improved interlocking mechanism.

[0005] According to one aspect of the utility model, an interlocking mechanism of an automatic transfer switch is provided, wherein the automatic transfer switch has an automatic mode and two manual modes, and comprises: a base; a housing connected to the base and having an operating hole; two operating mechanisms installed to the base and capable of driving the corresponding contact mechanisms to open and close in the two manual modes respectively; the interlocking mechanism comprises: a switching operating member, provided in the housing and configured to be movable to three positions corresponding to the automatic mode and the two manual modes; a gate opening operating member, provided in the housing and configured to drive the corresponding contact mechanisms to open in the two manual modes; a sliding member, movably connected to the switching operating member; a lever member, pivotally connected to the housing and movably connected to the sliding member, the lever member having a locking posture for limiting the gate opening action of the gate opening operating member in the automatic mode and an unlocking posture for avoiding the gate opening operating member in the two manual modes; a stopper, pivotally connected to the housing and movably connected to the lever member, wherein the stopper has a stopping posture for blocking the operating hole in the automatic mode and a avoiding posture for making way for the operating hole in the two manual modes.

[0006] The interlocking mechanism provided by the present solution is suitable for interlocking between multiple modes of the automatic transfer switch, which can ensure the safety of the operation of the automatic control mode and the manual control mode of the automatic transfer switch, while not affecting the user's normal control of the switching operating member to switch the mode. The interlocking mechanism of the present solution can improve the operational reliability and diversity of the automatic transfer switch, and has a simple structure, compact layout, and good economic benefits.

[0007] In some embodiments, the lever member has a first section, one of the first section and the sliding member is provided with a first sliding groove, and the other of the first section and the sliding member can move along the first sliding groove.

[0008] In some embodiments, the lever member has a second section, and in the locked position, the second section moves to overlap with the gate-opening operating member, and in the unlocked position, the second section moves to be offset from the gate-opening operating member.

[0009] In some embodiments, the second section is configured as an arc-shaped cantilever extending toward the opening gate operating member.

[0010] In some embodiments, the lever member has a third section, one of the third section and the stop member is provided with a second sliding groove, and the other of the third section and the stop member can move along the second sliding groove.

[0011] In some embodiments, the second slide groove is formed on the stop member, and the lever member is provided with a pin movably inserted into the second slide groove, wherein the second slide groove includes a first groove section and a second groove section connected at an angle, and in the automatic mode, the pin is in the first groove section, and in the two manual modes, the pin enters the second groove section from the first groove section.

[0012] In some embodiments, the second slot segment is configured as an arcuate slot segment, wherein in the two manual modes, the stop member is rotated to make the center of the second slot segment and the pivot center of the lever member be located in the same horizontal line.

[0013] In some embodiments, the interlocking mechanism further comprises a fixing member connected to the housing, and the stop member is pivotably connected to the fixing member.

[0014] In some embodiments, the switching operating member includes: a switching button having an operating end extending out of the housing; and a slider slidably disposed on the housing and connected to the switching button, wherein the slider is connected to the sliding member.

[0015] According to another aspect of the utility model, an automatic transfer switch is provided, which has an automatic mode and two manual modes, and includes: a base; a shell connected to the base and having an operating hole; two operating mechanisms, which are installed on the base and can respectively drive the corresponding contact mechanisms to open and close in the two manual modes; an interlocking mechanism, which is arranged on the shell; wherein the interlocking mechanism is the aforementioned interlocking mechanism.

[0016] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 is a schematic diagram of an automatic transfer switch according to an embodiment of the utility model, wherein the automatic transfer switch is in automatic mode;

[0019] Figure 2 is a posture schematic diagram of the interlocking mechanism in the automatic mode according to an embodiment of the utility model;

[0020] Figure 3 yes Figure 2 Axonometric drawing of the interlocking mechanism;

[0021] Figure 4 is a schematic diagram of a sliding member of an interlocking mechanism according to an embodiment of the utility model;

[0022] Figure 5 is a schematic diagram of a lever member of an interlocking mechanism according to an embodiment of the utility model;

[0023] Figure 6 is a schematic diagram of a stopper of an interlocking mechanism according to an embodiment of the utility model;

[0024] Figure 7 is a schematic diagram of an automatic transfer switch according to an embodiment of the utility model, wherein the automatic transfer switch is in a first manual mode;

[0025] Figure 8 is a posture schematic diagram of the interlocking mechanism in the first manual mode according to an embodiment of the utility model;

[0026] Fig. 9 is a schematic diagram of an automatic transfer switch according to an embodiment of the utility model, wherein the automatic transfer switch is in a second manual mode;

[0027] Fig.10 It is a posture schematic diagram of the interlocking mechanism in the second manual mode according to an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1-automatic transfer switch; 2-housing; 21-panel; 211-operating hole; 22-flip cover; 3-interlocking mechanism; 4-opening operating member; 5-switching operating member; 51-switching button; 52-baseline; 53-fixed cover; 6-sliding member; 61-hole; 7-lever member; 71-hole; 72-first section; 721-first slide slot; 722-pin; 74-second section; 741-cantilever arm; 75-third section; 751-hole; 752-pin; 76-pin; 8-stopper; 81-hole; 82-second slide slot; 821-first slot section; 822-second slot section; 83-pin; 9-fixed member DETAILED DESCRIPTION

[0030] Now, with reference to the accompanying drawings, the interlocking mechanism of the automatic transfer switch and the schematic scheme of the automatic transfer switch disclosed in the utility model are described in detail. Although the accompanying drawings are provided to present some embodiments of the utility model, the accompanying drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed or partially cut to better illustrate and explain the disclosure of the utility model. Some components in the accompanying drawings can be adjusted in position according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0031] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0032] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0033] Figure 1The front view of the automatic transfer switch 1 is shown. The automatic transfer switch 1 is connected to two power supplies, one of which is a normal power supply and the other is a backup power supply. There are two sets of operating mechanisms in the automatic transfer switch 1, which are installed on the base, and each operating mechanism can drive a set of contact mechanisms to open and close. One set of contact mechanisms can connect or disconnect the load with the normal power supply, and the other set of contact mechanisms can connect or disconnect the load with the backup power supply. The automatic transfer switch 1 has an automatic mode and a manual mode, wherein in the automatic mode, the conversion between the normal power supply and the backup power supply of the automatic transfer switch 1 does not require user intervention and is completed by its own preset mechanism. In the manual mode, the opening and closing action of the contact mechanism is realized by user operation. In order to realize the switching of the automatic transfer switch 1 between various modes, the automatic transfer switch 1 is provided with a switching operating member 5 on the housing 2, and the switching operating member 5 is particularly provided on the panel 21 of the housing 2 for user operation.

[0034] The switching operating member 5 can move relative to the housing 2 to switch the automatic transfer switch 1 to different modes. The switching operating member 5 has different positions corresponding to different modes of the automatic transfer switch 1. For example, in one embodiment, the automatic transfer switch 1 has an automatic mode, a first manual mode, and a second manual mode, and the switching operating member 5 has a first position corresponding to the automatic mode, a second position corresponding to the first manual mode, and a third position corresponding to the second manual mode. In order to facilitate the user to identify the current mode of the automatic transfer switch 1, identification marks can be respectively set on the housing 2, especially on the panel 21 on which the switching operating member 5 is installed, corresponding to different positions of the switching operating member 5, and the meanings are defined by words at each identification mark. For example, the identification mark can be an identification line, and the text "Auto" or "Automatic" is marked at the identification line aligned with the first position of the switching operating member 5, the text "S1" or "Manual 1" is marked at the identification line aligned with the second position of the switching operating member 5, and the text "S2" or "Manual 2" is marked at the identification line aligned with the third position of the switching operating member 5.

[0035] The movement of the switching operating member 5 can be linear or rotational. In the embodiment shown, the switching operating member 5 can move vertically relative to the housing 2 to switch between different positions. For ease of operation, the switching operating member 5 has a switching button 51, which can be, for example, a dial button. One end of the switching button 51 extends from the housing 2 for user operation, and the other end extends into the housing 2 and is connected to a slider. The user's operation of the switching button 51 will drive the slider to move synchronously. A fixed cover 53 (see FIG. 5 ) may be provided inside the housing 2. Figure 2 ) and form a slide groove on the fixed cover 53 to accommodate the slider and limit the movement trajectory of the slider.

[0036] In order to clearly distinguish the position of the switching operating member 5, a baseline 52 can be provided on the switching operating member 5. When the switching operating member 5 is in different positions, the baseline 52 can be aligned with the identification mark corresponding to the position on the housing 2. In one embodiment, the baseline 52 is formed on the switching button 51 and is displayed in a different color at the end of the switching button 51 extending out of the housing 2.

[0037] The automatic transfer switch 1 has different control strategies in the automatic mode and the manual mode. In the automatic mode, it is hoped that the user cannot interfere with the operation of the automatic transfer switch 1, while in the manual mode, it is hoped that the user can operate the corresponding contact mechanism to open and close. In addition, the user's behavior of controlling the movement of the switching operating member 5 to change the mode of the automatic transfer switch 1 will not be restricted. For this purpose, an interlocking mechanism 3 is set in the housing 2.

[0038] like Figure 2 and Figure 3 As shown, in the interlocking mechanism 3, the sliding member 6 is connected to the switching operating member 5, for example, connected to the slider of the switching operating member 5. In this way, the movement of the switching operating member 5 will drive the sliding member 6 to move synchronously. The lever member 7 is pivotally mounted to the housing 2 and controllably connected to the sliding member 6. Figure 4 and Figure 5 As shown, the sliding member 6 may be provided with a hole 61, and the lever member 7 may be provided with a hole 71 and a first slide groove 721. By passing a pin 76 fixed to the inner wall of the housing 2 through the hole 71, the lever member 7 can be pivoted around the pin 76. By passing a pin 722 through the hole 61 of the sliding member 6 and the first slide groove 721 of the lever member 7, the lever member 7 is controllably connected to the sliding member 6. When the sliding member 6 is driven by the switching operating member 5 to move up and down, the lever member 7 is driven to pivot, and at the same time, the pin 722 moves along the first slide groove 721, so that the lever member 7 moves relative to the sliding member 6. In one embodiment, the lever member 7 is formed with a first section 72 extending from its pivot point or near the pivot point toward the sliding member 6, and the first slide groove 721 is formed in the first section 72.

[0039] In other embodiments, the sliding member 6 may form a first sliding groove, and the lever member 7 may form a hole for the pin 722 to pass through.

[0040] One end of the lever member 7 extends to the vicinity of the opening gate operating member 4. The opening gate operating member 4 can move relative to the housing 2. In the first and second manual modes of the automatic transfer switch 1, the user can operate the opening gate operating member 4 to open the corresponding contact mechanism. One end of the opening gate operating member 4 extends out of the housing 2 for user operation, and the other end extends into the housing 2 and aligns with the opening gate mechanism. The movement mode of the opening gate operating member 4 can be linear motion or rotational motion. In the embodiment shown, the opening gate operating member 4 is configured as a button. When the automatic transfer switch 1 switches between different modes, the lever member 7 is driven to pivot around the pin 76. During the automatic mode, the lever member 7 pivots to the end thereof extending to the vicinity of the opening gate operating member 4 to form a locking relationship with the opening gate operating member 4, and the opening gate operating member 4 cannot be engaged to the opening gate mechanism. During the first and second manual modes, the lever member 7 pivots to the end thereof extending to the vicinity of the opening gate operating member 4 to leave the opening gate operating member 4, so that both are unlocked to allow the opening gate operating member 4 to engage to the opening gate mechanism.

[0041] The locking relationship between the lever member 7 and the opening gate operating member 4 can be achieved by overlapping the two along the movement direction of the opening gate operating member 4. In one embodiment, the lever member 7 can be pivoted to its end to be placed between the opening gate operating member 4 and the opening gate mechanism member to prevent the opening gate operating member 4 from engaging with the opening gate mechanism member. In another embodiment, the opening gate operating member 4 can form a groove along its circumference, and the lever member 7 can be pivoted to its end to fall into the groove to prevent the movement of the opening gate operating member 4 relative to the housing 2, thereby preventing the opening gate operating member 4 from engaging with the opening gate mechanism member. In other embodiments, the end of the lever member 7 can also form a groove, and the opening gate operating member 4 forms a protrusion that can be inserted into the groove.

[0042] The end of the lever member 7 close to the opening operating member 4 can be constructed in any suitable shape. Figure 5 As shown, the lever member 7 has a second section 74 that is angled with the first section 72, and the second section 74 extends from the pivot point or the vicinity of the pivot point of the lever member 7 toward the opening gate operating member 4. An arc-shaped (hook-shaped) cantilever arm 741 is configured at the extended end of the second section 74, and the cantilever arm 741 can form a locking relationship with the opening gate operating member 4.

[0043] When the automatic transfer switch 1 is in the first and second manual modes, in addition to being able to control the opening of the corresponding contact mechanism through the opening operating member 4, it is also desired that the user can operate the corresponding contact mechanism to open and close the switch. To this end, an operating hole 211 is provided on the housing 2, especially on the panel 21. The user can extend the operating rod into the operating hole 211 to complete the opening and closing operations. In the automatic mode, the action of extending the operating rod into the operating hole 211 is prohibited. To this end, the interlocking mechanism 3 is also provided with a stopper 8 that can block and clear the operating hole 211, and the stopper 8 can be pivotally mounted to the housing 2 and is controllably connected to the lever member 7.

[0044] like Figure 6 As shown, the stopper 8 has a hole 81 and a second slide groove 82. By passing a pin 83 fixed relative to the housing 2 through the hole 81, the stopper 8 can be pivoted around the pin 83. The pin 83 can be directly fixed to the inner wall of the housing 2. Alternatively, the pin 83 can be mounted to the fixing member 9, and the fixing member 9 is mounted to the inner wall of the housing 2. The end of the lever member 7 can move along the second slide groove 82. Figure 5 As shown, the lever member 7 is provided with a hole 751, and the pin 752 passes through the hole 751 and is movably inserted into the second slide groove 82. The user's operation of the switching operating member 5 will drive the sliding member 6 to move, drive the lever member 7 to pivot synchronously, and then drive the stopper 8 to pivot. In the automatic mode, the stopper 8 will pivot to cover the operating hole 211 from the inside, and in the first and second manual modes, the stopper 8 will pivot to clear the operating hole 211.

[0045] In the illustrated embodiment, the lever member 7 may be formed with a third section 75 which is angled with the first section 72 and the second section 74 respectively, and the third section extends from the pivot point or vicinity of the pivot point of the lever member 7 toward the stop member 8, and a hole 751 is formed at the extended end of the third section 75.

[0046] The principle of the interlocking mechanism 3 of this article will be described in detail below with reference to the accompanying drawings.

[0047] like Figures 1 to 3 As shown, the user can push the switch button 51 of the automatic transfer switch 1 to the first position to put the automatic transfer switch 1 into the automatic mode. The first position is, for example, at the top of the vertical motion track of the switch button 51. During this period, the slide 6 moves upward with the switch button 51, and the lever 7 is driven to move in the first direction (for example, Figure 2 The cantilever arm 741 of the second section 74 is close to the opening operating member 4 and forms a stop relationship with the opening operating member 4 in the movement direction of the opening operating member 4, so that the user cannot operate the opening operating member 4. At the same time, the pivoting of the lever member 7 drives the stopper 8 to pivot synchronously, and the stopper 8 eventually covers the operating hole 211, so that the operating rod cannot extend into the housing 2.

[0048] In order to prevent the operating rod from being lost, a receiving chamber may be provided on the housing 2 , and a cover plate, such as a flip cover 22 , may be provided for the receiving chamber.

[0049] like Figure 7 and Figure 8 As shown, the user can push the switch button 51 of the automatic transfer switch 1 to the second position, so that the automatic transfer switch 1 enters the first manual mode. The second position is, for example, in the middle of the vertical motion track of the switch button 51. During this period, the slide 6 moves downward with the switch button 51, and the lever 7 is driven in a second direction opposite to the first direction (for example, Figure 2 The cantilever arm 741 of the second section 74 moves away from and releases the opening switch operating member 4, allowing the user to operate the opening switch operating member 4 to open the switch. At the same time, the pivoting of the lever member 7 drives the stopper 8 to pivot synchronously, and the stopper 8 finally leaves the operating hole 211 to allow the operating rod to pass through the operating hole 211 to perform opening and closing operations.

[0050] like Fig. 9 and Fig.10 As shown, the user can push the switch button 51 of the automatic transfer switch 1 to the third position, so that the automatic transfer switch 1 enters the second manual mode. The third position is, for example, at the lowest end of the vertical motion trajectory of the switch button 51. During this period, the slide 6 moves downward with the switch button 51, and the lever 7 is driven in a second direction (for example, in a direction opposite to the first direction) opposite to the first direction. Figure 2 The cantilever arm 741 of the second section 74 is still away from and releases the gate-opening operating member 4, allowing the user to operate the gate-opening operating member 4 to open the gate. At the same time, since the stopper 8 has already cleared the operating hole 211 when the switch button 51 is in the second position, the stopper 8 can remain motionless during the movement of the switch button 51 from the second position to the third position. To this end, the second slide groove 82 of the stopper 8 can be designed with an angled first groove section 821 and a second groove section 822. During the movement of the switch button 51 to the first position, the lever member 7 enters the first groove section 821 and moves along the first groove section 821 to drive the stopper 8 to pivot. During the movement of the switch button 51 to the second position, the lever member 7 enters the second groove section 822 from the first groove section 821. The second groove section 822 can be configured as an arc-shaped groove section. When the switch button 51 moves to the second position, the stopper 8 rotates until the center of the arc-shaped groove section is in the same horizontal line with the pivot center of the lever member 7. In this way, no matter whether the switch button 51 moves from the second position to the third position or from the third position to the second position, the pivoting of the lever member 7 and the movement along the second groove section 822 will not cause the pivoting of the stop member 8, and the operating rod can be allowed to pass through the operating hole 211 to perform opening and closing operations.

[0051] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An interlocking mechanism for an automatic transfer switch, wherein the automatic transfer switch has an automatic mode and two manual modes, and comprises: Base; A housing (2) connected to the base and having an operation hole (211); Two operating mechanisms, mounted on the base and capable of driving the corresponding contact mechanisms to open and close the switch respectively in the two manual modes; Its characteristic is that the interlocking mechanism comprises: A switching operating member (5) is disposed on the housing (2) and is configured to be movable to three positions corresponding to the automatic mode and the two manual modes; A switch-off operating member (4), disposed on the housing (2) and configured to drive the corresponding contact mechanism to switch off in the two manual modes; A sliding member (6) movably connected to the switching operating member (5); a lever member (7) pivotally connected to the housing (2) and movably connected to the sliding member (6), the lever member (7) having a locking posture for limiting the opening action of the opening operating member (4) in the automatic mode and an unlocking posture for avoiding the opening operating member (4) in the two manual modes; A stopper (8) is pivotally connected to the housing (2) and movably connected to the lever member (7), wherein the stopper (8) has a stopper posture for blocking the operating hole in the automatic mode and a avoidance posture for leaving the operating hole open in the two manual modes.

2. The interlocking mechanism according to claim 1, characterized in that: The lever member (7) has a first section (72), one of the first section (72) and the sliding member (6) is provided with a first sliding groove (721), and the other of the first section (72) and the sliding member (6) can move along the first sliding groove (721).

3. The interlocking mechanism according to claim 1, characterized in that: The lever member (7) has a second section (74), and in the locked position, the second section (74) moves to overlap with the gate opening operating member (4), and in the unlocked position, the second section (74) moves to be offset from the gate opening operating member (4).

4. The interlocking mechanism according to claim 3, characterized in that: The second section (74) is configured as an arc-shaped cantilever extending toward the opening gate operating member (4).

5. The interlocking mechanism according to claim 1, characterized in that: The lever member (7) has a third section (75), one of the third section (75) and the stop member (8) is provided with a second sliding groove (82), and the other of the third section (75) and the stop member (8) can move along the second sliding groove (82).

6. The interlocking mechanism according to claim 5, characterized in that: The second slide groove (82) is formed in the stop member (8), and the lever member (7) is provided with a pin which is movably inserted into the second slide groove (82), wherein the second slide groove (82) comprises a first groove section (821) and a second groove section (822) which are connected at an angle, and in the automatic mode, the pin is in the first groove section (821), and in the two manual modes, the pin enters the second groove section (822) from the first groove section (821).

7. The interlocking mechanism according to claim 6, characterized in that: The second slot segment (822) is configured as an arc-shaped slot segment, wherein in the two manual modes, the stop member (8) rotates until the center of the second slot segment (822) and the pivot center of the lever member (7) are located in the same horizontal line.

8. The interlocking mechanism according to claim 1, characterized in that: The interlocking mechanism further comprises a fixing member (9) connected to the housing (2), and the stop member (8) is pivotally connected to the fixing member (9).

9. The interlocking mechanism according to claim 1, characterized in that: The switching operating member (5) comprises: A switch button (51) having an operating end extending out of the housing (2); A slider is slidably disposed on the housing (2) and connected to the switch button (51), wherein the slider is connected to the sliding member (6).

10. An automatic transfer switch having an automatic mode and two manual modes, and comprising: Base; A housing (2) connected to the base and having an operation hole (211); Two operating mechanisms, mounted on the base and capable of driving the corresponding contact mechanisms to open and close the switch respectively in the two manual modes; An interlocking mechanism, arranged on the housing (2); Its characteristic is that the interlocking mechanism is the interlocking mechanism according to any one of claims 1 to 9.

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