CN203800401U

CN203800401U - Bypass device, drawable chassis and power distribution system

Info

Publication number: CN203800401U
Application number: CN201420179974.6U
Authority: CN
Inventors: 刘振忠
Original assignee: Schneider Electric Industries SAS
Current assignee: Schneider Electric Industries SAS
Priority date: 2014-04-14
Filing date: 2014-04-14
Publication date: 2014-08-27
Anticipated expiration: 2024-04-14

Abstract

The disclosed embodiment relates to a power distribution system. The power distribution system comprises: a circuit breaker (1) which can be electrically connected to a bus (M) and can be electrically connected to a client circuit; and a bypass device (2) having a client wire connection terminal (21) which can be electrically connected to the client circuit and a bus terminal (22) which can be electrically connected to the bus (M), wherein the client wire connection terminal (21) is in electrical connection with the bus terminal (22), and the bypass device(2) can be moved between a first position at which the bus (M) is electrically connected to the client circuit and a second position at which the bus (M) is disconnected from the client circuit. According to the power distribution system, the circuit breaker can be disconnected from portion between the bus and the client circuit without interrupting the power supply of the client so as to perform overhaul or maintenance on the circuit breaker. A bypass device and a drawable chassis which are used in the power distribution system are also disclosed.

Description

Bypass apparatus, take out frame and distribution system

Technical field

Each execution mode of the present disclosure relates to bypass apparatus, take out frame and consisting of distribution system.

Background technology

Low-voltage circuit breaker be in low voltage distribution circuit for loaded current, distribute electric energy and overload or the short circuit in the situation that, cut off the electricity supply with the element of protection equipment and circuit.Drawer-type air circuit breaker (claiming again omnipotent breaker or frame-type circuit breaker) is because the convenience of using and overhauling is subject to user's welcome deeply, and it does not need to dismantle busbar when maintenance, as long as breaker body is shaken out from take out frame.Yet some occasion, as the blast furnace of steel plant, chemical plant reaction tank etc. are because not having a power failure, and make this maintenance easily become illusory, thereby cause circuit breaker to lack maintenance regularly and the hidden danger brought.How can the in the situation that of not power-off, overhaul circuit breaker or change the circuit breaker damaging is the problem that this technology solves.

Utility model content

In view of the foregoing, one of object of the present disclosure provides a kind of distribution system, and it is for solving at least a portion of the existing problem of above-mentioned existing distribution system.

According to an aspect of the present disclosure, a kind of distribution system is provided, comprising: circuit breaker, can be electrically connected to bus, and can be electrically connected to client circuit; Bypass apparatus, has the client binding post that can be electrically connected to this client circuit, and can be electrically connected to the bus terminal of this bus, and this client binding post and this bus terminal electric connection; Wherein, this bypass apparatus can move between primary importance and the second place, in this primary importance, this this bus of bypass apparatus electric connection and this client circuit, thereby this circuit breaker of bypass, and in this second place, this bypass apparatus disconnects and being electrically connected to this client circuit from this bus.By this bypass apparatus, for bypass current path is provided between client circuit and bus, can in the situation that not interrupting client to power, circuit breaker be disconnected between bus and client circuit, circuit breaker is overhauled or safeguard.

According to an embodiment of the present disclosure, between this circuit breaker and bypass apparatus, be provided with interlocking device, so that when this circuit breaker is during in off-state, this bypass apparatus can not move to this second place from this primary importance, or moves to this primary importance from this second place.By this interlocking device, can prevent that operating personnel from accessing bypass apparatus between bus and client circuit during in off-state at circuit breaker, or break from it, thus the injury of avoiding producing electric arc and electric power and bringing to operating personnel thus.Therefore, this interlocking device provides the guarantee of safety operation bypass apparatus.

According to an embodiment of the present disclosure, this distribution system also comprises takes out frame, this bypass apparatus is installed on movably this and takes out in frame, at this, take out on frame and have rocking handle hole, a rocking handle can insert in this rocking handle hole and shake so that this bypass apparatus is taken out to frame with respect to this and move between this primary importance and this second place.

According to an embodiment of the present disclosure, this interlocking device comprises that being arranged on this takes out the interlocking on frame, the main spindle's identification part that can drive this flexible blocking lever of interlocking, be connected to the STATEMENT OF FEDERALLY SPONSORED of this blocking lever and be connected to this STATEMENT OF FEDERALLY SPONSORED; When the main shaft of this circuit breaker rotates to closing position, this main spindle's identification part is driven by the drive rod on this main shaft of this circuit breaker and rotates, thereby by this STATEMENT OF FEDERALLY SPONSORED, driving this blocking lever to press this interlocks to punctured position, make this interlocking not block this rocking handle hole, mobile this bypass apparatus thereby this rocking handle can insert wherein; And when the main shaft of this circuit breaker rotates to open position, this main spindle's identification part is driven and in the opposite direction rotation by the drive rod on this main shaft of this circuit breaker, thereby drive this blocking lever no longer to press this interlocking by this STATEMENT OF FEDERALLY SPONSORED, make this interlocking resetting to the position of blocking this rocking handle hole, mobile this bypass apparatus thereby this rocking handle can not insert wherein.

According to an embodiment of the present disclosure, at this, take out and on frame, be also provided with spring, it is configured to coordinate with the step surface on this blocking lever, while rotating to open position with the main shaft when this circuit breaker, this spring promotes that this blocking lever is no longer pressed this interlocking so that this interlocking resets from this punctured position, thereby this interlocking is blocked this rocking handle hole, this rocking handle can not be inserted wherein and mobile this bypass apparatus.

According to an embodiment of the present disclosure, this STATEMENT OF FEDERALLY SPONSORED is sleeve pipe cable, and the two ends of the sleeve pipe of this sleeve pipe cable are separately fixed at this and take out on frame.

According to an embodiment of the present disclosure, this STATEMENT OF FEDERALLY SPONSORED is the hawser of connecting rod or tensioning.

According to another aspect of the present disclosure, a kind of bypass apparatus applicable to above-mentioned distribution system is also provided, comprise the client binding post that can be electrically connected to client circuit and the bus terminal that can be electrically connected to bus, wherein this client binding post and this bus terminal electric connection.

According to another aspect of the present disclosure, a kind of frame of taking out applicable to above-mentioned distribution system is also provided, comprise movable support member, it is configured to support bypass apparatus or circuit breaker; This is taken out frame and also comprises rocking handle hole, and a rocking handle can insert in this rocking handle hole and shake so that this bypass apparatus is taken out to frame with respect to this and move; At this, take out the blocking lever that is also provided with retractable interlocking on frame, can drives this interlocking indentation, the main spindle's identification part that is connected to the STATEMENT OF FEDERALLY SPONSORED of this blocking lever and is connected to this STATEMENT OF FEDERALLY SPONSORED, at the retracted position of this interlocking, this interlocking is not blocked this rocking handle hole this rocking handle can be inserted wherein; At the not retracted position of this interlocking, this interlocking is blocked this rocking handle hole can not insert wherein this rocking handle.

According to an embodiment of the present disclosure, at this, take out and on frame, be also provided with spring, it is configured to coordinate with the step surface on this blocking lever, and to promote, this blocking lever is not pressed this interlocking so that this interlocking resets to not retracted position from this retracted position, thereby this interlocking is blocked this rocking handle hole.

Accompanying drawing explanation

When read by reference to the accompanying drawings below exemplary embodiment detailed description time, these and other object, feature and advantage will become apparent, in the accompanying drawings:

Fig. 1 is according to the perspective view of the distribution system of embodiment of the present disclosure;

Fig. 2 is according to the perspective view of the bypass apparatus of embodiment of the present disclosure;

Fig. 3 is the right side view of the bypass apparatus in Fig. 2;

Fig. 4 shows client binding post and the bus terminal of the bypass apparatus in Fig. 2;

Fig. 5 shows the bypass apparatus on frame of taking out being installed on according to embodiment of the present disclosure;

Fig. 6 is the partial enlarged drawing of taking out frame in Fig. 5, wherein interlocks in extrusion position;

Fig. 7 is the partial enlarged drawing of taking out frame in Fig. 5, wherein interlocks in retracted position;

Fig. 8 shows the interlocking device between circuit breaker and bypass apparatus;

Being connected between the main shaft that Fig. 9 shows circuit breaker and interlocking device.

Embodiment

To make reference to embodiment of the present disclosure now, one or more examples of embodiment are shown by accompanying drawing.Embodiment provides by elaboration of the present disclosure, and is not intended to conduct to restriction of the present disclosure.For example, as the shown or described feature of a part of an embodiment, may be used to generate in another embodiment another further embodiment.The disclosure is intended to comprise these and other modifications and variations that belong to disclosure scope and spirit.

Fig. 1 is according to the perspective view of the distribution system of embodiment of the present disclosure.This distribution system comprises circuit breaker 1, and this circuit breaker 1 can be electrically connected to bus M by binding post, and can be electrically connected to client circuit by binding post.The terminal that the closed and disconnected of this circuit breaker 1 by the moving contact by main shaft drives carrys out control connection bus M and the electric connection or the disconnection that are connected between the terminal of client circuit, to be electrically connected to the client circuit being connected bus M or to disconnect from bus M.This circuit breaker 1 can be various known or circuit breakers in the future, and the motion that can control the main shaft of circuit breaker by variety of ways such as manual, program control carrys out closed or cut-off breaker.As required, circuit breaker 1 can have a group or more binding post (being that three groups of binding posts are to be connected to three-phase bus M shown in Fig. 1).

This distribution system also comprises bypass apparatus 2, and it has the client binding post 21 that can be electrically connected to client circuit, and can be electrically connected to the bus terminal 22 of described bus M, as Figure 2-3.Client binding post 21 is communicated with (seeing Fig. 4) with bus terminal 22 by conducting connecting part 23 permanent electric, and can be by the client binding post 21 and bus terminal 22 of this electric connection of conductor monolithic molding.Bypass apparatus 2 also can have a group or more binding post.Figure 2 illustrates the bypass apparatus 2 with three groups of binding posts.

According to embodiment of the present disclosure, bypass apparatus 2 can move between primary importance and the second place, in primary importance, the bus terminal 22 of bypass apparatus 2 touches the terminals of bus M, the client binding post 21 of bypass apparatus 2 touches the terminals of client circuit, and the terminals of this client circuit are also connected to the client binding post on circuit breaker simultaneously.Therefore, when bypass apparatus 2 is between primary importance access bus M and client circuit, this bypass apparatus 2 and circuit breaker 1 are connected in parallel between bus M and client circuit, thus bypass apparatus 2 provide from client circuit to bus M not via the bypass resistance path of circuit breaker 1.Now, user can disconnect circuit breaker 1 from bus M and client circuit, so that circuit breaker 1 is safeguarded, simultaneously client circuit by bypass apparatus 2 still with bus M electric connection, thereby the work of client circuit will can not interrupted.And work as bypass apparatus 2, move to the second place, bypass apparatus 2 disconnects and is electrically connected to remove bypass current path with client circuit from bus M, so that the circuit breaker 1 between access bus M and client circuit can work, with the break-make between control bus M and client circuit.

Preferably, bypass apparatus 2 and circuit breaker 1 are placed on movably and are taken out in frame 3 respectively.Take out the interior setting of frame 3 can be with respect to taking out the mobile strutting piece of frame 3 turnover, for example rail plate or supporting plate, to support bypass apparatus 2 and circuit breaker 1.On frame 3, there are rocking handle hole 31, one rocking handles and shake that bypass apparatus 2 or circuit breaker 1 are shaken into or shaken out with respect to taking out frame 3 in can inserting rocking handle hole 31 taking out.Therefore the bypass apparatus 2 of, taking out in frame 3 can be moved to the primary importance contacting with client circuit connection terminal with bus M and the second place disengaging with bus M and client circuit connection terminal.Similarly, circuit breaker 1 also can be moved to the primary importance contacting with client circuit connection terminal with bus M and the second place disengaging with bus M and client circuit connection terminal.

Because bus M is conventionally with high voltage or great electric current, not by thering is the circuit breaker of safeguard procedures and directly disconnection or connection will produce electric arc with being electrically connected to of bus M, thereby this electric arc possibility ablation electrical contact and near part damage electric equipment, and the safety that may endanger operating personnel.For example, and because moment is switched on or switched off the acute variation of the induced field intensity that large electric current causes, near electric equipment bus M, (on the contact of bypass apparatus 2) can cause large electric power, this may also can endanger operating personnel's safety.Therefore, do not allow by circuit breaker 1, directly do not utilize bypass apparatus 2 to disconnect or connect bus M.That is to say, only the in the situation that of closing of power circuit breaker bus M and client circuit (being breaker closing), just allow bypass apparatus 2 access bus M or disconnect from bus M, because the now access of bypass apparatus 2 or disconnection can not affect the connected state between client circuit and bus M, thereby can not cause electric arc or electric power.

In order to ensure can not or disconnecting from bus M bypass apparatus 2 access bus M under the state not closing a floodgate at circuit breaker 1, preferably, between circuit breaker 1 and bypass apparatus 2, be provided with interlocking device, so that when circuit breaker 1 is when disconnecting (opening a sluice gate) state, bypass apparatus 2 can not move to the second place from primary importance, or from the second place, move to primary importance, namely bypass apparatus 2 can not be moved.

With reference to accompanying drawing 5-9, in one embodiment, this interlocking device comprises the main spindle's identification part 35 that is arranged on the interlocking 32 taken out on frame 3, can drives the flexible blocking lever 33 of interlocking 32, be connected to the STATEMENT OF FEDERALLY SPONSORED 34 of blocking lever 33 and be connected to STATEMENT OF FEDERALLY SPONSORED 34.Interlocking 32 is outstanding with against blocking lever 33 forward from taking out frame 3 bottom sides, and it can be being retracted in the hole of taking out frame 3 bottom sides by depressing of blocking lever 33, and can be when blocking lever 33 is no longer pressed, by being arranged on the spring reset in hole.Interlocking 32 also has and stop part (not shown) interlocking 32 one or interlock in rocking handle hole 31.When interlocking is during 32 indentation, this stop part moves to the position that can not hinder rocking handle to be inserted into rocking handle hole 31, and resets to when taking out frame 3 sidepieces and give prominence to when interlocking 31, and this stop part will stop in rocking handle hole 31 that rocking handle is inserted into rocking handle hole 31.Blocking lever 33 is L shaped, and its one end is connected to STATEMENT OF FEDERALLY SPONSORED 34 from taking out frame 3 sides, and the other end redirect to be taken out frame 3 fronts and face interlocking 32 ledge with plane.

According to embodiment of the present disclosure, main spindle's identification part 35 is rotatably mounted on the sidewall of taking out frame 3 that circuit breaker 1 is housed, and its one end is connected to STATEMENT OF FEDERALLY SPONSORED 34, and the other end has projection to form cam mechanism.Being arranged on drive rod 11 on the main shaft of driving moving contact of circuit breaker 1 can be around the pivot revolution of main shaft, thereby coordinates with projection on main spindle's identification part 35 and driving main shaft location recognition part 35 is clockwise or be rotated counterclockwise.

When circuit breaker 1 is during in "on" position, thereby main shaft rotation drives drive rod 11 revolution, thereby one end being connected with STATEMENT OF FEDERALLY SPONSORED 34 of driving main shaft location recognition part 35 rotates to the far-end of straining STATEMENT OF FEDERALLY SPONSORED 34.In the execution mode of Fig. 8, this STATEMENT OF FEDERALLY SPONSORED 34 is sleeve pipe cable (being similar to the brake cable of bicycle), the two ends of the sleeve pipe of this sleeve pipe cable are separately fixed at installs taking out frame 3 and the taking out on frame 3 of bypass apparatus 2 being installed of circuit breaker 1, cable in sleeve pipe one end is connected to main spindle's identification part 35, and the other end is connected to blocking lever 33, cable can be identified under the pulling of part 35 with respect to sleeve movement at main spindle's.Therefore, main spindle's identification part 35 tension cables by drives blocking lever 33 to taking out the motion of frame rear, thereby blocking lever 33 faces the plane of ledge of interlocking 32 by pressing 32 the ledge of interlocking, and makes its indentation (seeing Fig. 7).Interlocking 32 the stop part that is arranged in rocking handle hole 31 thereby indentation (be retracted into the more depths in rocking handle hole 31 or from the side opening wall indentation in rocking handle hole 31) will occur thereupon, thus make in rocking handle hole 31 unobstructed.Now, operator can be inserted into rocking handle in rocking handle hole 31, and shake rocking handle, thereby drive the bypass apparatus 2 of taking out in frame 3 outwards to move relative to taking out frame 3, thereby the client binding post at bypass apparatus 2 rear portions 21 disengages (the arrival second place) with client circuit terminal and bus M terminals respectively with bus terminal 22, thereby disconnect and being electrically connected to client circuit and bus M.Now, circuit breaker 1 is in closing position, thereby still keeps electric connection between client circuit and bus M, thereby can not engage the unsafe conditions such as electric arc or electric power occur due to the disconnection of bypass apparatus 2.

In the situation that STATEMENT OF FEDERALLY SPONSORED 34 is cable, be also provided with spring 36 taking out on frame 3, it is configured to coordinate with the step surface 37 on blocking lever 33.When the main shaft of circuit breaker 1 rotates to open position, main spindle's identification part 35 is driven by the drive rod 11 on the main shaft of circuit breaker 1 and in the opposite direction rotation and no longer strain cable, now, compressed spring 36 promotes blocking lever 33 against step surface 37 and no longer presses interlocking 32 to taking out frame 3 the place ahead motions.Interlocking 32 resets from punctured position under the restoring force effect of contained spring, thereby the stop part of the indentation of interlocking 32 reaches in the passage in rocking handle hole 31, blocks rocking handle hole 31, rocking handle 4 can not be inserted wherein and mobile described bypass apparatus 2.Like this, at the gate-dividing state of circuit breaker 1, operating personnel cannot mobile bypass apparatus 2, breaks, thereby prevent electric arc and electric power thereby cannot be linked in bus M or from bus M.Operating personnel in finding rocking handle cannot to be inserted into rocking handle hole 31 after, will recognize that circuit breaker 1 does not also close a floodgate.Then, operating personnel can close a floodgate circuit breaker 1, and the main shaft of circuit breaker 1 drives 35 rotations of main spindle's identification part to pull STATEMENT OF FEDERALLY SPONSORED 34, and rocking handle hole 31 is no longer blocked by interlocking 32.Now, operating personnel can insert rocking handle and in rocking handle hole 31, shake and mobile bypass apparatus 2 safely.

This STATEMENT OF FEDERALLY SPONSORED 34 can be also the hawser of connecting rod or tensioning.The connecting rod of use rigidity can be identified part 35 by main spindle's and in front and back, move up to pin respectively or unlimited rocking handle hole 31 at two rightabout rotary actuation connecting rods and blocking lever 33, thereby spring 36 can be omitted.And if use the hawser of tensioning, to be that blocking lever 33 resets necessary for spring 36, because main spindle's identification part 35 only can pull hawser and blocking lever 33 in one direction.The direction that can change the hawser of tensioning by the mechanism such as pulley is taken out frame 3 with what hawser was connected to bypass apparatus 2 from circuit breaker 1, thus can be for the different relative bearing between circuit breaker 1 and bypass apparatus 2 and by between hawser tensioning.

For the object that illustrates and describe, provided specification of the present disclosure, but it is not intended to be exhaustive or be limited to the utility model of disclosed form.It may occur to persons skilled in the art that a lot of modifications and variant.It will be appreciated by those skilled in the art that the method and apparatus in disclosure execution mode can be with software, hardware, firmware or its combination realization.

Therefore; execution mode is for principle of the present disclosure, practical application being described better and making the other staff in those skilled in the art can understand following content and select and describe;; do not departing under the prerequisite of disclosure spirit, all modifications of making and replacement all will fall in the disclosure protection range of claims definition.

Claims

1. a distribution system, is characterized in that, comprising:

Circuit breaker (1), can be electrically connected to bus (M), and can be electrically connected to client circuit;

Bypass apparatus (2), there is the client binding post (21) that can be electrically connected to described client circuit, with the bus terminal (22) that can be electrically connected to described bus (M), and described client binding post (21) and described bus terminal (22) electric connection;

Wherein, described bypass apparatus (2) can move between primary importance and the second place, in described primary importance, bus (M) and described client circuit described in described bypass apparatus (2) electric connection, thereby circuit breaker described in bypass (1), and in the described second place, described bypass apparatus (2) disconnects and being electrically connected to described client circuit from described bus (M).

2. distribution system according to claim 1, it is characterized in that, between described circuit breaker (1) and bypass apparatus (2), be provided with interlocking device, so that when described circuit breaker (1) is during in off-state, described bypass apparatus (2) can not move to the described second place from described primary importance, or moves to described primary importance from the described second place.

3. distribution system according to claim 2, it is characterized in that, also comprise and take out frame (3), described in being installed on movably, takes out described bypass apparatus (2) in frame (3), described taking out on frame (3), have rocking handle hole (31), a rocking handle can insert in described rocking handle hole (31) and shake that described bypass apparatus (2) is moved between described primary importance and the described second place with respect to the described frame (3) of taking out.

4. distribution system according to claim 3, it is characterized in that, described interlocking device comprises takes out the interlocking (32) on frame (3), the main spindle's identification part (35) that can drive the flexible blocking lever (33) of described interlocking (32), be connected to the STATEMENT OF FEDERALLY SPONSORED (34) of described blocking lever (33) and be connected to described STATEMENT OF FEDERALLY SPONSORED (34) described in being arranged on;

Wherein, when the main shaft of described circuit breaker (1) rotates to closing position, described main spindle's identification part (35) is driven by the drive rod (11) on the described main shaft of described circuit breaker (1) and rotates, thereby drive described blocking lever (33) to press described interlocking (32) to punctured position by described STATEMENT OF FEDERALLY SPONSORED (34), make described interlocking (32) not block described rocking handle hole (31), the mobile described bypass apparatus (2) thereby described rocking handle (4) can insert wherein;

And when the main shaft of described circuit breaker (1) rotates to open position, described main spindle's identification part (35) is driven and in the opposite direction rotation by the drive rod (11) on the described main shaft of described circuit breaker (1), thereby drive described blocking lever (33) no longer to press described interlocking (32) by described STATEMENT OF FEDERALLY SPONSORED (34), make described interlocking (32) reset to the position of blocking described rocking handle hole (31), the mobile described bypass apparatus (2) thereby described rocking handle (4) can not insert wherein.

5. distribution system according to claim 4, it is characterized in that, described taking out, on frame (3), be also provided with spring (36), it is configured to coordinate with the step surface (37) on described blocking lever (33), while rotating to open position with the main shaft when described circuit breaker (1), described spring (36) promotes that described blocking lever (33) is no longer pressed described interlocking (32) so that described interlocking (32) resets from described punctured position, thereby described interlocking (32) is blocked described rocking handle hole (31), described rocking handle (4) can not be inserted wherein and mobile described bypass apparatus (2).

6. according to the distribution system described in claim 4 or 5, it is characterized in that, described STATEMENT OF FEDERALLY SPONSORED (34) is sleeve pipe cable, takes out on frame (3) described in the two ends of the sleeve pipe of described sleeve pipe cable are separately fixed at.

7. according to the distribution system described in claim 4 or 5, it is characterized in that, described STATEMENT OF FEDERALLY SPONSORED (34) is the hawser of connecting rod or tensioning.

8. applicable to the bypass apparatus of the distribution system of any one in claim 1-7,

It is characterized in that, comprise the client binding post (21) that can be electrically connected to client circuit and the bus terminal (22) that can be electrically connected to bus (M), wherein said client binding post (21) and described bus terminal (22) electric connection.

9. applicable to the frame of taking out of the distribution system of any one in claim 1-7, it is characterized in that, comprise movable support member, it is configured to support bypass apparatus (2) or circuit breaker (1);

The described frame of taking out also comprises rocking handle hole (31), and a rocking handle (4) can insert in described rocking handle hole (31) and shake that described bypass apparatus (2) is moved with respect to the described frame (3) of taking out;

At the described blocking lever (33) that is also provided with retractable interlocking (32) on frame (3), can drives described interlocking (32) indentation, the main spindle's identification part (35) that is connected to the STATEMENT OF FEDERALLY SPONSORED (34) of described blocking lever (33) and is connected to described STATEMENT OF FEDERALLY SPONSORED (34) taken out, retracted position in described interlocking (32), described interlocking (32) is not blocked described rocking handle hole (31) described rocking handle (4) can be inserted wherein; At the not retracted position of described interlocking (32), described interlocking (32) is blocked described rocking handle hole (31) can not insert wherein described rocking handle (4).

10. the frame of taking out according to claim 9, it is characterized in that, described taking out, on frame (3), be also provided with spring (36), it is configured to coordinate with the step surface (37) on described blocking lever (33), to promote, described blocking lever (33) is not pressed described interlocking (32) so that described interlocking (32) resets to not retracted position from described retracted position, thereby described interlocking (32) is blocked described rocking handle hole (31).