CN218780125U - Variable-length handle and electrical switch cabinet - Google Patents

Abstract

The present disclosure provides a length-variable handle and an electrical switchgear. The variable length handle has a first rotational position and a second rotational position and includes: a body (5; and an operating handle (6 ') comprising a fixed part (7') and a movable part (8 '), wherein the fixed part (7') is fixed to the body (5 '), the movable part (8') being movably arranged with respect to the fixed part (7 ') between a first position in which the operating handle (6') has a maximum length and a second position in which the operating handle (6.

Description

Variable-length handle and electrical switch cabinet

Technical Field

The present disclosure relates to a length-variable handle and an electrical switchgear.

Background

A fuse (fuse) is a commonly used current protector, and is widely applied to high and low voltage distribution systems and control systems and electric equipment. The fuse has the working principle that a metal conductor is used as a melt body to be connected in series in a circuit, and when overload or short-circuit current passes through the melt body, the melt body is melted by heat generated by the melt body, so that the circuit is disconnected.

The fuse drawer is characterized in that the fuse is arranged in the drawer, and when the fuse drawer needs to be overhauled, the drawer can be pulled out, so that the fuse is easy to replace. Other components can be installed in the fuse drawer, and the fuse drawer can be used in various switch cabinets.

In known solutions of fuse drawers, two kinds of handles are generally used to perform the switching on and off operations of the fuse, one being a short handle and the other being a long handle. In some high-current fuses, the force required by the opening and closing operation is very large, a handle needs to be operated anticlockwise, and if a short handle is used, the operation of a user is quite laborious; if a long handle is used, the lever is longer, and labor is saved. However, the long handle often interferes with some secondary components on the front panel of the drawer, such as indicator lights, emergency buttons, etc., when the drawer is opened or closed. In this case, the user can only change back to the short handle. In addition, due to the high uncertainty of the secondary components in the final solution of the user, it is difficult to determine which solutions cannot use the long handle. Even though the force required for the switching-on and switching-off operations of some low-current fuses is not large, the conventional fixed-length handle cannot meet the requirements of all users in consideration of the difference in force that can be provided by different users, and thus cannot provide high flexibility.

Therefore, there is a need in the art for a handle that is labor-efficient, easy to operate, and avoids interference with other components.

SUMMERY OF THE UTILITY MODEL

The utility model provides a variable length handle and electrical switch cabinet, the variable length handle can be used for the divide-shut brake operation of the fuse in the drawer of electrical switch cabinet especially, the variable length handle is laborsaving, easy operation and has avoided the problem of interfering with other components and parts.

In one aspect, the present disclosure provides a variable length handle having a first rotational position and a second rotational position and comprising: a main body fixedly or rotatably connected to a structure on an outer surface of a panel of a drawer of an electrical switchgear, wherein the structure has an open state and a closed state corresponding to the first rotational position and the second rotational position, respectively; and an operation handle including a fixed portion fixed to the body and a movable portion movably disposed with respect to the fixed portion between a first position where the operation handle has a maximum length and a second position where the operation handle has a minimum length.

In one embodiment, the fixing portion includes: the first shell, a first rack accommodated in the first shell, and a first elastic member arranged between the first shell and the first rack and configured to apply elastic biasing force to the first rack; the movable portion includes: a second housing and a second rack gear accommodated within the second housing, wherein the first housing is at least partially accommodated within the second housing, and a tooth portion of the first rack gear and a tooth portion of the second rack gear face each other and are capable of being engaged with each other by a bias of the first elastic member.

In an embodiment, the fixing portion further comprises a stop member and a second resilient member at a first end of the fixing portion remote from the body; the movable portion further includes a stop engagement portion at a first end of the movable portion. The stopper has a retracted position retracted within the first housing and an extended position extended out of the first housing into engagement with the stopper fitting, the second resilient member exerting a resilient biasing force on the stopper to enable biasing of the stopper to the extended position. When the movable part is not in the first position, the inner wall of the second housing holds the stopper in the retracted position against the elastic biasing force of the second elastic member, and when the movable part is in the first position, the stopper is in the extended position to engage with the stopper fitting part and lock the operation lever at the maximum length.

In one embodiment, the stop engagement portion is provided as a first hole and the stop member is provided as a stop pin received in a second hole in the first rack. The stop pin includes a first portion disposed within the second bore, a second portion biasable into the first bore by a second resilient member, and a stop wall extending perpendicular to a longitudinal axis of the stop pin and between the first portion and the second portion, the stop wall abuttable against an inner wall of the first housing to limit movement of the stop pin, and the second portion of the stop pin includes an angled guide surface oriented such that, when the movable portion moves from the first position toward the second position, the stop pin is urged by a sidewall of the first bore to move to the retracted position.

In one embodiment, the fixing portion further comprises an additional stopper. When the movable part is in the second position, the additional stop member engages with the stop fitting to lock the operating handle at the shortest length.

In one embodiment, the fixed part comprises a first rod fixed to the body and the movable part comprises a second rod rotatably disposed at a first end of the first rod remote from the body. The second lever is rotatable between the first position and a second position.

In one embodiment, the first rod has an internal hollow cavity, wherein in the second position the second rod is received within the hollow cavity.

In one embodiment, a snap-fit assembly is provided at a free end of the second lever, and a groove is provided at a second end of the first lever adjacent to the body. In the second position, the clamping assembly is at least partially engaged within the recess.

In an embodiment, a third elastic member is disposed between the second rod and the first rod. After the clamping assembly is separated from the groove, the second rod rotates to leave the second position under the action of the elastic biasing force of the third elastic piece.

In one embodiment, the clamping assembly comprises a sliding block and a fourth elastic piece arranged between the sliding block and the second rod. The slider moves along a guide provided at a free end of rotation of the second rod, and the fourth resilient member exerts a resilient biasing force on the slider to retain the slider at least partially within the recess.

In another aspect, the present disclosure provides an electrical switchgear comprising a drawer in which a fuse is located, further comprising a variable length handle as described above, the body of the variable length handle being fixedly or rotatably connected to a switching-off and closing operation mechanism of the fuse on an outer surface of a panel of the drawer.

Drawings

Advantages and objects of the present disclosure may be better understood from the following detailed description of preferred embodiments of the disclosure taken in conjunction with the accompanying drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the relationship of the various components. In the drawings:

fig. 1a and 1b show front views of a drawer of an electrical switchgear cabinet according to the present disclosure;

FIG. 2 shows a top view of the drawer according to FIGS. 1a and 1 b;

FIG. 3 shows a schematic view of a variable length handle according to one embodiment of the present disclosure;

FIG. 4 shows a schematic view of the variable length handle according to FIG. 2 with a maximum length;

FIG. 5 shows an exploded schematic view of the variable length handle according to FIG. 2;

FIG. 6 shows a cross-sectional view of the variable length handle according to FIG. 2;

FIG. 7 shows a cross-sectional view of the variable length handle according to FIG. 2 during a length change;

FIG. 8 shows a cross-section and a partially enlarged cross-section of the variable length handle according to FIG. 2 during a length change;

FIG. 9 shows a cross-section and a partially enlarged cross-section of the variable length handle according to FIG. 2 with a maximum length;

FIG. 10 shows a schematic view of the stop member of the variable length handle according to FIG. 2;

FIG. 11 shows a schematic view of a variable length handle according to another embodiment of the present disclosure;

FIG. 12 shows a cross-sectional view of the variable length handle according to FIG. 11, wherein the snap-in assembly is not engaged in the groove;

FIG. 13 shows another cross-sectional view of the variable length handle according to FIG. 11 with the snap-in assembly engaged in the groove; and

fig. 14 shows a cross-sectional view of the variable length handle according to fig. 11 with a maximum length.

Detailed Description

Various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Here, it is to be noted that, in the drawings, the same reference numerals are given to the constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted. The terms "first direction", "second direction", "height direction", "length direction", "rotation direction", "left side", "right side", "front side", "back side", and the like herein are described with respect to the drawings of the present disclosure, if not specifically stated. The term "comprising a, B, C, etc. in sequence" merely indicates the order of the included components a, B, C, etc. and does not exclude the possibility of including other components between a and B and/or between B and C. The description of "first" and its variants is merely for distinguishing between the components and does not limit the scope of the disclosure, which may be written as "second" and so on without departing from the scope of the disclosure.

The drawings in the present specification are schematic views to assist in explaining the concept of the present disclosure, and schematically show the shapes of respective portions and their interrelationships.

Some embodiments according to the present disclosure are described in detail below with reference to fig. 1a to 14.

As shown in fig. 1a, 1b and 2, a drawer of an electrical switchgear according to the present disclosure comprises a variable length handle 1, a panel 2, a drawer handle 3, and a fuse 4. The length-variable handle 1 is provided on an outer surface of a panel 2 of the drawer and has an adjustable length. The fuse 4 is provided inside the drawer, and has, for example, a switching-off and switching-on operation mechanism, such as a switching-off and switching-on main shaft, extending outside the drawer through the drawer panel. The variable length lever 1 is connected to a switching operation mechanism of the fuse 4, and is fixed to, for example, a switching main shaft. The switching-off and switching-on of the fuse 4 can be realized by rotating the length-variable handle 1. Specifically, when the variable-length handle 1 is at the first rotational position as shown by the solid line in fig. 1a and 1b, the fuse 4 is opened, and the opening and closing operation mechanism thereof is correspondingly in the opened state; when the length-variable grip 1 is at the second rotational position as shown by the broken line in fig. 1a and 1b, the fuse 4 is closed, and the switching-on/off operation mechanism is correspondingly in a closed state. That is, the closing operation requires the counterclockwise rotation of the variable length handle 1. As shown in fig. 1a, the variable-length handle 1 has the shortest length, and thus, interference with various components on the drawer panel 2, such as a switching indicator, a human-machine interface (HMI), an emergency button, and the like, is avoided. As shown in fig. 1b, the variable-length handle 1 has a maximum length, and thus can provide a labor-saving operation option. Of course, the length-variable grip 1 may also have any length between the shortest length and the maximum length, i.e. stepless adjustment of the length may be achieved. The variable length handle 1 of the present disclosure has high flexibility.

As shown in fig. 3, the variable-length handle of one embodiment of the present disclosure includes a main body 5 and a manipulation handle 6. The main body 5 is fixedly or rotatably connected to a structure, such as the opening and closing operation mechanism of the fuse 4 described above, particularly the opening and closing main shaft. Of course, in other applications, the main body 5 may be fixedly or rotatably connected to the opening and closing operation mechanism of the circuit breaker. The structure depends on the specific application scenario.

As shown in fig. 4, the operation handle 6 includes a fixed portion 7 and a movable portion 8. The fixed part 7 is fixed to the body 5, and the movable part 8 is movably disposed relative to the fixed part 7 between a first position at which the operating lever 6 has a maximum length and a second position at which the operating lever 6 has a minimum length. The operating handle 6 shown in fig. 3 has the shortest length, and the operating handle 6 shown in fig. 4 has the greatest length.

As shown in fig. 5, the fixing portion 7 includes: a first housing 9, a first rack 10 accommodated in the first housing 9, and a first elastic member 11 provided between the first housing 9 and the first rack 10 and configured to apply an elastic biasing force to the first rack 10. The movable portion 8 includes: a second housing 12 and a second rack 13 housed in the second housing 12. As shown in fig. 3 and 4, the first housing 9 is at least partially accommodated within the second housing 12. For example, the first housing 9 is a cylindrical housing having at least an open bottom to expose the teeth of the first rack 10, and the second housing 12 is a cylindrical housing having only one open end. For example, the second rack 13 may be fixed to the bottom wall of the second housing 12 by a plurality of screws 27, and the teeth of the second rack 13 face the inside of the second housing 12. As shown in fig. 6, the tooth portions of the first and second racks 10 and 13 face each other and can be engaged with each other by the bias of the first elastic member 11. When the operator pulls the second housing 12 to move toward the first position, translating in the horizontal rightward direction as shown in fig. 6 to 7, the teeth of the second rack 13 may push the first rack 10 to move upward against the elastic biasing force of the first elastic member 11. After a desired distance of movement, the teeth of the second toothed rack 13 engage with the teeth of the first toothed rack 10 under the effect of the resilient bias, so that the movable part stays in this position. In this way, a stepless adjustment of the length can be achieved. The number of the first elastic members 11 may be three, or may be other numbers. As shown in fig. 6, the first elastic member 11 is disposed in the recess of the first rack 10, and has one end abutting against the top wall of the first housing 9 or the stopper portion of the top wall of the first housing 9 extending into the recess of the second rack and the other end abutting against the bottom wall of the recess.

As shown in fig. 4 and 5, the fixed part 7 further comprises a stop member 14 and a second elastic member 15 at a first end 71 of said fixed part 7, remote from the body 5; the movable part 8 further comprises a stop fitting 16 at a first end 81 of said movable part 8. The first end 81 of the movable portion 8 is an end that is always closer to the main body 5 than the other end thereof.

As shown in fig. 8 and 9, the stopper 14 has a retracted position retracted within the first housing 9 and an extended position extended out of the first housing 9 to engage with the stopper fitting portion 16. The second elastic member 15 exerts an elastic biasing force on the stopper member 14 to be able to bias the stopper member 14 to the extended position. As shown in fig. 8, when the movable part 8 is not in the first position where the operation handle 6 has the maximum length, the inner wall of the second housing 12 holds the stopper 14 in the retracted position against the elastic biasing force of the second elastic member 15. As shown in fig. 9, when the movable portion 8 is in the first position in which the operation lever 6 has the maximum length, the stopper 14 is located at the extended position to engage with the stopper engaging portion 16 and lock the operation lever 6 at the maximum length. Preferably, the stop mating portion 16 is provided as a first hole and the stop member 14 is provided as a stop pin received in a second hole on the first rack 10. For example, the first hole is provided on a side wall of the second housing 12. The second hole is a hole through the first rack 10 transverse, for example perpendicular, to the axis of extension a of the operating handle 6. The stop member 14 may be provided as two stop pins with a second resilient member 15, such as a spring, disposed therebetween. Further, the stopper fitting portions 16 are provided as two first holes provided on the two side walls of the second housing 12, respectively, which are aligned with the second holes, respectively, when the movable portion 8 is in the above-described first position. Of course, the first housing 9 is also provided with holes through which the stop pins pass. The stopper shown in the drawings is moved in the vertical direction shown in the drawings to achieve the stopper function, but the present disclosure is not limited thereto, and a stopper that is moved in a direction perpendicular to the paper surface to achieve the stopper function is also possible, for example, the stopper may be moved perpendicular to the top wall of the first housing and the stopper fitting portion is provided on the top wall of the second housing. The top wall of the first housing is the uppermost wall of the first housing in fig. 6 and 7, and the two side walls of the first housing are walls extending downward from the edges of the top wall.

As shown in fig. 10, the stop pin includes a first portion 141 disposed in the second hole and a second portion 142 that can be biased into the first hole by the second resilient member 15. The second elastic member 15 is connected to the first portions 141 of the two stop pins. Furthermore, the stop pin comprises a stop wall 143 extending perpendicularly to the longitudinal axis B of the stop pin (i.e. an axis perpendicular to the axis a of extension of the operating handle, such as an axis extending in a vertical direction in fig. 9) and located between the first portion 141 and the second portion 142, which stop wall 143 can abut against an inner wall of the first housing 9 to limit the movement of the stop pin. The second portion 142 of the stop pin includes an inclined guide surface 144, the inclined guide surface 144 being oriented such that, when the movable part 8 moves from the first position towards the second position, i.e. in the horizontal left direction as viewed in figures 8 and 9, the stop pin is pushed by the side wall of the first bore to move to the retracted position. More precisely, the stop pin is pushed by the end of the side wall of the first hole. The second part 142 of the stop pin may have a D-shaped form so that it can only be pushed back to the retracted position when the movable part 8 moves from the first position towards the second position. Specifically, the surface of the second portion 142 of the stop pin opposite the inclined guide surface 144 is parallel to the axis of extension B of the stop pin so that the movable part 8 can no longer continue to move horizontally to the right in fig. 8 and 9 after reaching the second position.

Referring again to fig. 3 and 4, the fixing portion 7 further comprises a further stop member 17. When the movable part 7 is in the second position, the further stop 17 engages with the stop cooperating part 16 to lock the operating handle 6 in the shortest length. The further stop 17 is, for example, a projection provided on a side wall of the first housing 9 of the fixing portion 7, for example, with a rounded surface. With this arrangement, the movable portion 8 can be caught, so that a certain amount of force is required to move the movable portion 8.

The length-variable handle of the embodiment can realize stepless length adjustment, and the stop functions are designed at the first position and the second position, so that labor-saving operation options can be realized, and the problem of interference with other components is avoided.

As shown in fig. 11, the variable-length handle of another embodiment of the present disclosure has a folded form, and also includes a main body 5 'and an operation handle 6'. The body 5' is fixedly or rotatably connected to a structure, such as a switching-on/off operating mechanism of the fuse 4, in particular a switching-on/off main shaft. Of course, in other applications, the body 5' may be fixedly or rotatably connected to the opening and closing operating mechanism of the circuit breaker. The structure depends on the specific application scenario. The lever 6' includes a fixed portion 7' and a movable portion 8'. The fixed part 7 'is fixed to the body 5' and the movable part 8 'is movably arranged with respect to the fixed part 7' between a first position, in which the operating lever 6 'has the largest length, and a second position, in which the operating lever 6' has the shortest length, in particular between the first position and the second position. The lever 6' shown in fig. 11 has the shortest length, when the fixed part 7' and the movable part 8' form an angle of 0 °. The operating handle 6' shown in fig. 14 has a maximum length, in which case the fixed part 7' and the movable part 8' form an angle of 180 °. Of course, other angles are possible, and the movable part 8' may rest at any angle between 0 and 180 degrees.

As shown in fig. 12 to 14, the fixed part 5' comprises a first lever 18 fixed to the body 5', and the movable part 8' comprises a second lever 19 rotatably arranged at a first end 181 of the first lever 18 remote from the body, the second lever 19 being rotatable between a first position and a second position. In particular, the second lever 19 rotates about the rotation axis 26 at the first end 181 of the first lever 18. When the movable part 8' is in the first position, further rotation of the second lever 19 will be blocked by the first end 181 of the first lever 18, thereby achieving a stop function.

As shown in fig. 14, the first lever 18 has an inner hollow cavity. As shown in fig. 11 to 13, in the second position, the second rod 19 is housed within the hollow cavity.

As shown in fig. 11 to 14, the second lever 19 is provided with a snap-in assembly 20 at a free end 191 for rotation and the first lever 18 is provided with a recess 21 adjacent the second end 182 of the body. In the second position, the clip assembly 20 is at least partially engaged within the recess 21. The recess 21 may also be located on the body.

A third resilient member 22, such as a spring, is arranged between the second lever 19 and the first lever 18. After the latch assembly 20 is disengaged from the recess 21, the second lever 19 is rotated away from the second position by the resilient biasing force of the third resilient member 22.

Preferably, the clamping assembly 20 comprises a slider 24 and a fourth elastic member 25 (e.g. a spring) arranged between the slider 24 and the second rod 19. The slider 24 moves along a guide 23 provided at the free end 191 of the second rod 19, the guide 23 being, for example, a long and narrow hole at the free end 191 of the second rod 19, which extends in the direction of extension of the second rod. The fourth elastic member 25 is disposed between the slider 24 and the inner wall of the guide portion 23 which is a long and narrow hole or the inner wall of another recess (a recess shown as a blank at the rotational free end 191 shown in fig. 12 and 13) at the rotational free end 191 of the second lever 19, and applies an elastic biasing force to the slider 24 to keep the slider at least partially located within the groove 21, thereby locking the movable portion (i.e., the second lever 19) at the second position.

Furthermore, the slider 24 has a projection extending beyond the top of the second lever 19 for the operator to toggle the slider 24 by it, so that the slider 24 is moved out of the recess 21 (specifically, translated in the horizontal right direction shown in fig. 13) against the elastic biasing force exerted by the fourth elastic member 25, thereby allowing the second lever 19 to be rotated. As shown in fig. 12 and 13, the top of the second rod 19 has a guide hole through which the projection extends and can guide its movement. Preferably, the front end of the slider 24 is designed with a guiding bevel so that it can smoothly enter the recess 21 in the body.

The foldable length-variable handle of the embodiment can realize the rotation of any angle between 0 degree and 180 degrees, so that the adjustment of different lengths can be realized, and the stop functions are designed at the first position and the second position, so that labor-saving operation options can be realized, and the problem of interference with other components is avoided.

The above-disclosed features are not limited to the combinations with other features disclosed, and other combinations between features may be made by those skilled in the art based on the disclosure for the purpose of disclosure.

Claims (11)

1. A variable length handle having a first rotational position and a second rotational position and comprising:

a body (5, 5') fixedly or rotatably connected to a structure on an outer surface of a panel of a drawer of an electrical switchgear cabinet, wherein said structure has an open condition and a closed condition corresponding to said first and second rotational position, respectively; and

an operating handle (6,

wherein the fixed part (7.

2. The variable length handle of claim 1,

the fixing part (7) includes: a first housing (9), a first rack (10) housed within the first housing, and a first elastic member (11) provided between the first housing and the first rack and configured to apply an elastic biasing force to the first rack;

the movable part (8) comprises: a second housing (12) and a second rack (13) housed in the second housing,

wherein the first housing (9) is at least partially accommodated within the second housing (12), and the teeth of the first rack (10) and the teeth of the second rack (13) face each other and are capable of being engaged with each other by the bias of the first resilient member (11).

3. The variable length handle according to claim 2, wherein the fixed part (7) further comprises a stop member (14) and a second resilient member (15) at a first end (71) of the fixed part remote from the body (5); the movable part (8) further comprises a stop fitting (16) at a first end (81) of the movable part,

wherein the stopper (14) has a retracted position retracted within the first housing (9) and an extended position extended out of the first housing (9) to engage with the stopper fitting portion (16), the second resilient member (15) exerting a resilient biasing force on the stopper to be able to bias the stopper to the extended position,

when the movable part (8) is not in the first position, the inner wall of the second housing (12) holds the stopper (14) in the retracted position against the elastic biasing force of the second elastic member (15), and

when the movable part (8) is in the first position, the stop member (14) is in the extended position to engage the stop engagement portion (16) and lock the operating lever (6) to a maximum length.

4. Variable length handle according to claim 3, wherein the stop engagement portion (16) is provided as a first hole and the stop member (14) is provided as a stop pin received in a second hole on the first rack (10),

wherein the stop pin comprises a first portion (141) arranged in the second bore, a second portion (142) biasable into the first bore by a second resilient member (15), and a stop wall (143) extending perpendicular to the longitudinal axis of the stop pin and located between the first portion (141) and the second portion (142), the stop wall being able to abut against an inner wall of the first housing (9) to limit the movement of the stop pin, and

the second portion (142) of the stop pin includes an inclined guide surface (144) oriented such that, when the movable portion (8) moves from the first position towards the second position, the stop pin is urged by the side wall of the first aperture to move to the retracted position.

5. Variable length handle according to claim 3, wherein the fixing part (7) further comprises a further stop (17),

wherein the further stop member (17) engages with the stop cooperating portion (16) to lock the operating handle (6) at the shortest length when the movable portion (8) is in the second position.

6. Variable-length handle according to claim 1, characterized in that the fixed part (7 ') comprises a first lever (18) fixed to the body, the movable part (8 ') comprises a second lever (19) rotatably arranged at a first end (181) of the first lever (18) remote from the body (5 '),

wherein the second lever (19) is rotatable between the first and second positions.

7. The variable length handle according to claim 6, wherein the first lever (18) has an internal hollow cavity, wherein in the second position the second lever (19) is received within the hollow cavity.

8. Variable length handle according to claim 7, wherein a snap-in assembly (20) is provided at the free end of rotation (191) of the second lever and a recess (21) is provided at the second end (182) of the first lever (18) near the body,

wherein, in the second position, the clamping assembly (20) is at least partially engaged in the recess (21).

9. Variable-length handle according to claim 8, characterized in that a third elastic element (22) is arranged between the second lever (19) and the first lever (18),

wherein, after the clamping assembly (20) is disengaged from the groove (21), the second rod (19) rotates away from the second position under the action of the elastic biasing force of the third elastic piece (22).

10. Variable-length handle according to claim 8, wherein the clamping assembly (20) comprises a slider (24) and a fourth resilient member (25) arranged between the slider and the second lever,

wherein the slider (24) moves along a guide (23) provided at the free end of rotation of the second rod, an

The fourth resilient member (25) exerts a resilient biasing force on the slider to retain the slider (24) at least partially within the recess (21).

11. Electrical switchgear cabinet comprising a drawer in which a fuse is located, characterized in that it further comprises a variable length handle according to any one of claims 1 to 10, the body of which is fixedly or rotatably connected to the opening and closing operating mechanism of the fuse on the outer surface of the panel of the drawer.

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