EP0802551B1 - Locking device for cartridge fuses in an isolating switch - Google Patents

Abstract

The device has securing fittings arranged transversely adjacent, separated from each other by at least one phase isolation wall and held by suspension parts via grip lugs. Each has a sprung latch (15) which can be locked with the lug (2). At least two latches (15) are mounted on a common slider which can be moved transversely to the longitudinal direction (11) of the securing device mounted in the isolating switch against the bias force of a spring. This brings the latches out of engagement with the lugs. The latches extend through a cover side wall to form a pushbutton (21).

Description

The invention relates to a NH fuse switch disconnector with switch frame and with respect to this Movable cover, in which the fuse links next to each other transversely to their longitudinal direction arranged, separated from each other by at least one phase partition and by means of their Handle straps are held by suspension parts, with a device for releasable locking of fuse links is provided, in each of which a spring-loaded bolt with the respective grip tab can be brought into locking engagement, with at least two bolts on a common slide are attached, which counter to the biasing force of a spring is displaceable and brings the latches from the handle tabs out of locking engagement.

It is known to remove fuse links in NH fuse switch disconnectors or strips attached to switch consumers on or off with these switches. The relative to The switch frame can be swung out and swung back onto the cover Switches the fuse links that are used in a switch disconnector known from operation three of them are arranged side by side, one insert for each phase (RST). Therefore are on the lids of the known switch hanging parts for receiving handle straps attached. Step out of the switch frames by swiveling them out and pushing them in Centrifugal forces on which unsecured fuse links disengage from the suspension parts would push. With some switches, the fuse links are attached so that first engages a lower contact spring, then swivels the upper contact spring, whereby also axial force components occur that push the relevant one out Can cause fuse insert from its anchoring in the lid.

For this reason, the respective handle tab has been locked in the hanging parts. At a known solution is in the longitudinal direction of the fuse link outside the first tab a plastic latch arranged resiliently biased so that the handle tab when inserted pushes the bolt in the longitudinal direction of the fuse link by manual force, so that the user then push the rear grip tab down into the hanging parts and insert it can. The spring behind the bolt pushes the fuse link over the handle tab so far to the rear, that the rear grip tab also engages in the recesses there and the fuse link is firmly locked. This known solution is a form and non-positive locking, which can be released by having such a hand exerts great force so that the front grip tab can push the bolt back.

It has been shown that with this as well as with other interlocks known from practice of security interventions, the staff should touch and counter each individual security interlock must press the locking pressure of the bolt and only then can it be removed. One often occurs such removal after operation. The fuse link heats up during operation Part not insignificant, so that the operator can burn and injure himself.

There are also devices in practice in which the operator concerned besides touching unlock the bolt with a special tool must, and such accesses are difficult because of the limited space.

DE 74 17 818 U1 shows a tool designed as a handle insert with which several Fuse links can be pulled out of their circuits or inserted into them. For this purpose, the tool has T-shaped recesses into which the tabs of the fuse links are inserted can be used. A locking bar can be moved lengthways using a handle the fuse links are moved so that part of the T-shaped recesses is blocked and the grip tabs are held securely in the tool.

DE 94 03 039 U1 shows an NH fuse-switch disconnector of the generic type the bolts are identical to the suspension parts, so that the fuse links only in the locked state are held by means of their tabs. Here, too, the bolts can be moved lengthways the fuse links arranged in the disconnector are moved. This embodiment has the disadvantage, however, that the locking device has a large spatial extent and transmits the switching forces via the bolts to the tabs on the fuses become.

The object of the invention is therefore to provide a NH fuse switch disconnector of the type mentioned to create, in which the removal of the fuse links easily, with great reliability and can be done at any time without touching personnel.

According to the invention, this object is achieved in that the slide crosswise in the transverse direction is displaceable to the longitudinal direction of the fuse links arranged in the disconnector and that it extends through a side wall of the lid to form a button.

The removal of the fuse links before or after operation, d. H. after switching off the Energy is significantly simplified in a facility with the measures mentioned above. The operator only needs to press the button protruding from one side wall to press and can thus simultaneously unlock at least two fuse links such that both inserts fall out almost simultaneously when the lid is tipped over or held at an angle. No The fuse link needs to be handled more by hand or even pressed. If the button is no less than a hand's width from the opposite side wall, as in smaller disconnectors is the case, for example size 00, then the user can use a Unlock hand. The thumb grips one side wall and one of the fingers on the key protruding opposite. The key is pressed in the mentioned transverse direction, i. H. transverse to the longitudinal direction of the fuse links. Their longitudinal direction is in the direction of the two opposite contact knife or the connecting line between them assumed. The Slider thus extends at least over one, preferably over two or three side by side arranged fuse links in this cross direction, because the fuse links sit crosswise so that their longitudinal directions are parallel. The preload the spring naturally also acts in this transverse direction, because it presses the Slider in locking engagement. Without touching a fuse link by the hand of a Users can remove one or even three fuse links from the cover at the same time of a switch disconnector. So even with very warm fuse links a removal possible immediately after switching off the consumer. The lid is on one embodiment pivotable relative to the switch frame. It is also particularly advantageous the possibility to make the cover removable from the switch frame. The unlocking is evident and removing the fuse links easily and without problems and risk of injury possible.

The button extending through the side wall of the cover in the said transverse direction protrudes half a finger width laterally out of the side wall. This is the key easily accessible for every user. But it can also be useful at the point of passage a small recess in the side wall of the button so that the button accessible and to be operated by the user in the same way from the outside, nevertheless the outer contour of the entire lid is not exceeded. This allows compact Mount the switch disconnectors close together so that they do little Need space.

For effective locking, it goes without saying that for a fuse link Slider with latch must only be provided in the area of one of the two tabs. The opposite side is through the rigid connection of the other handle tab with the Fuse insert locked equally.

In a further advantageous embodiment of the invention, the bolt is as a web with the Slider connected hook formed, which engages around the grip tab. This structure advantageously allows the arrangement of the plate-shaped or substantially flat Handle tab between the slide on the one hand and the hook or bolt on the other. The rest- or locking surface of the hook encompasses the grip tab in this way. This results in good ones Possibilities to optimally use the space available in the disconnector. For example the unwanted pressing out of the grip tab in the longitudinal direction of the fuse link avoid upwards by the hook that grips the handle tab from above, while below, i.e. with regard to the tab on the side opposite the hook of the slider is arranged. This requires one for its extension in the transverse direction mentioned Minimum space, including the height that can be seen in the longitudinal direction of the fuse links

There are embodiments in which the front wall of the lid through a window or even is closed by a sliding window, in which test holes for the voltage test are arranged. By sliding this window, the hole in question can either be covered or exposed. A voltage measuring tool is through this hole to Handle tab or contact knife inserted through it. For this correct application of the tool a minimum space is required on the securing part. There are embodiments of switch disconnectors, where this space is limited in relation to the position of the grip tab For one such embodiment, the design of the bolt as a hook is very cheap because of relatively large slide then on the lower side of the handle tab and the hook with its locking or blocking surface are to be arranged on the top of the grip tab.

It is also advantageous according to the invention if the slide has an elongated box profile and at the end opposite the key receives a compression spring. The slide can be for example, from solid, electrically insulating and durable plastic or injection molding. An inexpensive design for an elongated slide that preferably extends over two or three fuse links arranged side by side in the mentioned transverse direction extends, is the box profile mentioned. Its cross-section is U-shaped, with the two free leg of the U connecting middle web towards the front wall of the cover is arranged. The hollow box of this slide profile is then behind this web.

On the side of this elongated slider opposite the button, the mentioned one can Compression spring can be received and locked in the cavity of this slide. It supports itself against the side wall of the cover or an intermediate web in the cover, which is opposite the side wall with the recessed grip through which the button protrudes.

According to the invention, the slide can also be fastened between one on the cover Arrange the guide bracket and a preferably removable cover front wall in a sliding manner. This configuration significantly improves the installation of the slide with or without its hook. Even if the slider is elongated and arranged side by side over all three Fuse links, he can from, i.e. simple from the front wall of the lid be used without unscrewing other parts on the cover beforehand. There are those before already mentioned embodiment, in which a part of the front cover as a window or is even designed as a sliding window. You can do this with the right construction for the Assemble the slider, then snap the slider in the shape of the elongated one Insert the box profile against the compression spring and then the window again snap in.

The guide angle mentioned, which in cross section is L-shaped in one embodiment is, can have legs so long that the leg heights the cross-sectional dimensions of the Slide. Then the tab can like the L-shaped guide bracket up complete the second free leg of a U. The slidable reciprocating slider is then enclosed between the handle tab and the guide bracket as in a cage. According to either the front wall of the cover or its sliding window can close the guide bracket close a closed box housing. Tilting and jamming of the slide before and while pressing the button is then excluded. In the case of a sliding window With a test hole for voltage measurement, the hole can be pushed through the slide be covered. After pushing up this window, the hole of the covering walls (e.g. the slide) vertically in the longitudinal direction of the fuse link away and clears the space behind to the grip tab for voltage measurement.

It is also expedient if, according to the invention, the slide and the latches are in one plane the hanging parts leaving an insertion slot and behind the front cover wall are movable. The elongated slide can be thought of as being placed in a vertical plane, which is parallel to the front wall of the lid. The normal direction of view is then perpendicular to this Level. In the case of a flat cover front wall, this is the one considered here preferred embodiment opposite to the viewing direction close (1- 5 mm) in front, or that The window or the sliding window is there. Between this front cover or the The window or the sliding window is there. Between this front cover or the Windows on the one hand and the hanging parts on the lid for the grip tab of the fuse link on the other hand, there is a certain amount of space due to the design, and this is exactly where the slide with the Bars arranged, which by its arrangement the compact structure of the whole Disconnector not affected. Also vertically above the slide is the Leave enough space between the bars to hold tools for tension testing if necessary, lead to the contact blades.

It is also advantageous if, according to the invention, on the locking surface of the bolt opposite side and / or between these an inlet slope is formed similar to other spring-loaded bolts can also be the plate to be locked here considered embodiment namely the grip tab, when pushing in against the Run in chamfer and thus counter the spring pressure in the longitudinal direction of the Push the slide away so that the locking surface or locking surface when inserting the grip tab is pushed to its end position to the side after positioning the Snap the grip tab back into locking engagement. There are different ones here Hook shapes possible. In essence, the inlet slope should be on the restricted area of the Riegel's opposite side or next to it. You then need to insert the Locking tabs are not a special tool to slide the slide in with its bolts to bring the unlocking position.

Another advantageous embodiment of the invention is characterized in that Slider approximately perpendicular to its longitudinal and sliding direction at a distance from each other protrude arranged blocking webs. Similar to the first considered embodiment with the hook-shaped bolt, which is also connected to the slider via a web, the bars themselves are designed as such bridges. The hook at the end is missing this Embodiment does not encompass the grip tabs to be locked but lies down on one side in front of this, so that the tabs on this side are not without deliberate unlocking can be taken out or fall out. The number of blocking bars corresponds to Number of fuse links to be locked in the switch disconnector.

Figur 1

die Draufsicht auf einen NH-Sicherungslasttrennschalter für drei nebeneinander angeordnete Sicherungseinsätze, die hier aber nicht gezeigt sind,

Figur 2

eine Seitenansicht auf den Trennschalter der Figur 1, wenn man in Figur 1 von rechts nach links blickt,

Figur 3

schematisch und abgebrochen eine Einzelheit entsprechend dem Kreis X in Figur 1,

Figur 4

eine Draufsicht auf einen abgebrochen dargestellten Sicherungseinsatz mit Grifflasche mit den Aufhängeteilen und dem gemäß Pfeil verschiebbaren hakenförmigen Riegel,

Figur 5

eine andere Ausführungsform des Riegels am Schieber in Form von Blockierstegen, und

Figur 6

eine vergrößerte Querschnittsansicht eines abgebrochenen Sicherungseinsatzes mit links daneben angeordnetem Deckel und dazwischen befindlichem Schieber

Further advantages, features and possible uses of the present invention result from the following description of preferred exemplary embodiments in conjunction with the attached drawings. Show it:

Figure 1

the top view of a NH fuse switch disconnector for three fuse inserts arranged side by side, but which are not shown here,

Figure 2

2 shows a side view of the isolating switch of FIG. 1 when looking from right to left in FIG. 1,

Figure 3

schematically and broken a detail corresponding to the circle X in Figure 1,

Figure 4

2 shows a plan view of a safety insert, shown broken off, with a grip tab with the hanging parts and the hook-shaped bolt which can be moved according to the arrow,

Figure 5

another embodiment of the bolt on the slide in the form of blocking webs, and

Figure 6

an enlarged cross-sectional view of a broken fuse link with the lid arranged to the left and a slide located between them

The fuse link generally designated 1 in the embodiments shown here is attached via its grip tab 2 in the suspension parts 4 forming an insertion slot 3

In the fuse switch disconnector shown in FIGS. 1 and 2, which consists of switch frame 5 and cover 6 with handle 7, the suspension parts 4 are in the cover 6. The front cover of the cover 8 is closed at the front by a sliding window 9, in the test holes above and below 10 are provided for the voltage test.

The terms “above” and “below” are taken from the consideration of FIGS. 1 and 2. To The dash-dotted lines 11 in FIG. 1, which the Longitudinal direction of the fuse links not shown in Figure 1, but arranged in the disconnector 1 represent. If one spans a thought coordinate system, then these run the Longitudinal direction 11 straight lines in the Y direction. Right across, i.e. in X direction runs the horizontal, dash-dotted line 12 shown in Figure 1, which is the transverse direction 2, while the horizontal dash-dotted line 13 runs in the Z direction, which is in the direction of view when looking at Figure 1. The upper parts are located accordingly the disconnector in the longitudinal direction 11 in the direction of arrow + Y. The slide 14 with the Bolt 15 is against the X direction (horizontal line 12) against the action of a Compression spring 16 slidable.

In the embodiment shown here there are three fuse links 1 in the transverse direction 12 next to each other, which is why three bars 15 are formed on the slide 14. On the respective web 17 are the bolts 15 in the embodiments according to FIGS. 1-4 and 6 connected in hook form on the slide 14. These hook-shaped bars 15 can be seen around the handle tab 2. In other words, there is one side of the handle tab 2 (below) the slide 14, and on the opposite side the latch 15 engages in a hook-like manner the grip tab 2 that the blocking surface 18 shown in Figure 3 is above the grip tab 2 with the Result that this is not from the insertion slot 3 between the suspension parts 4 after can move out in the longitudinal direction 11 in the direction + Y.

But if you want to remove the fuse links 3, then you press on the in the transverse direction 12 in the recess 19 of the right side wall 20 of the disconnector and more precisely its cover 6 protruding button 21. This pushes the slide 14 against the force of the compression spring 16 in Direction -X of the transverse direction 12, i.e. in Figure 1 to the left and in Figure 2 in the direction of view. On in this way the bolt 15 shown in FIGS. 3 and 4 moves in Transverse direction 12 from the locking position shown in solid lines in Figure 3 in the unlocked position shown with dashed lines. The compression spring 16 then pushes the slider 14 by itself again in the transverse direction 12 in the shown with solid lines Position. To reinsert the handle tab according to Figures 1, 3 and 6 in the longitudinal direction 11 pressed vertically from top to bottom, with the grip tab 2 on the inlet slope 22 of the hook-shaped bolt 15 presses and this again in the transverse direction 12 in the dashed shown position presses until the grip tab 2 has the position shown in Figure 3, so that the Bolt 15 can be pushed back into the locking position. This entry slope 22 is in the embodiment shown here according to FIGS. 1 and 3 on the blocking surface 18 of the side facing away from the bolt 15, i.e. attached above.

In Figure 1 you can see how the suspension parts 4 are an integral part of the lid 6 and that the Cover has phase partitions 23. The switch frame 5 has phase partitions 24, which are between the fuse inserts 1 not shown up to the position of the Slider 14 extend. Cover 6 can be pivoted about pivot point 25 using bearing guide 26 can be pivoted up into the open position (not shown) by pulling the handle 7 in Figure 1 moves to the left and in Figure 2 to the left. The switch frame 5 is on the mounting holes 27 for mounting on a base plate, for example on the plate of a closet.

In the illustration in FIG. 6, the upper part of the cover front wall 8 is perpendicular in one plane cut to the paper plane of Figure 1 and through the longitudinal direction 11. You can see behind the cover front wall 8 a connecting web 28, which is part of an L-shaped guide bracket 29, on the horizontally lying connecting web 28, the slide 14 is guided. In addition, the cover is also stiffened by this guide bracket 29 The place within this guide angle 29 behind the sliding window 9 is just enough for Recording of the hollow, cross-sectionally U-shaped box profile of the slide 14 on the outside at the free end of the upper leg of the U, the bars 15 are formed vertically upright.

The cross-sectional design of the slide 14 of the other embodiment shown in FIG. 5 is structured similarly. Here, too, the user can push the slide by pressing in the transverse direction 12 14 push against the force of the compression spring 16 out of the position shown in FIG.

Approximately perpendicular to the sliding direction 12, which is called the transverse direction for the entire device here is, three blocking webs 30 protrude downward in the longitudinal direction 11 of the fuse links 1. They are mutually a distance a from each other. Your restricted area 18 is yours End face, if you consider their direction of extension from the slide 14 This In the locking position, which is shown in FIG. 5, the locking surface 18 lies above the grip tab 2 and also prevents it from being lifted upwards out of the suspension parts 4. Man depending on the space available in the switch disconnector, the slide 14 either below the Handle straps 2 or at a distance from the blocking webs 30 above the same (FIG. 5) arrange. The advantages of the invention result in both embodiments.

Claims (7)

1. A low-voltage HRC safety load-break switch with a switch frame (5) and a cover (6) which is movable with respect thereto, in which the safety inserts (1) are arranged in mutually juxtaposed relationship transversely with respect to their longitudinal direction (11), are separated from each other by at least one phase separating wall (23, 24) and are held by means of their gripping bars (2) by suspension members (4), wherein there is provided a device for releasably locking safety inserts (1), in which a respective resiliently biased locking bar (15) can be brought into locking engagement with the respective gripping bar (2), wherein at least two locking bars (15) are mounted on a common slider (14) which is displaceable in opposition to the biasing force of a spring (16) and in so doing takes the locking bars (15) out of locking engagement with the gripping bars (2), characterised in that the slider (14) is displaceable in the transverse direction (12) transversely with respect to the longitudinal direction (11) of the safety inserts (1) arranged in the disconnect switch and that it extends through a side wall (20) of the cover (6) forming a button (21).
2. A low-voltage HRC safety load-break switch according to claim 1 characterised in that the locking bar (15) is in the form of a hook which is connected by way of a leg (17) to the slider (14) and which embraces the gripping bar (2).
3. A low-voltage HRC safety load-break switch according to claim 1 or claim 2 characterised in that the slider (14) is of an elongate box-shaped profile and accommodates a compression spring (16) at the end in opposite relationship to the button (21).
4. A low-voltage HRC safety load-break switch according to one of claims 1 to 3 characterised in that the slider (14) is arranged slidably between an angle guide member (29) secured to the cover (6) and a preferably removable cover front wall (8).
5. A low-voltage HRC safety load-break switch according to one of claims 1 to 4 characterised in that the slider (14) and the locking bars (15) are displaceable in a plane in front of the suspension members (4) leaving an insertion slot (3) and behind the cover front wall (8).
6. A low-voltage HRC safety load-break switch according to one of claims 1 to 5 characterised in that an inclined entry surface (22) is provided on the side remote from the locking surface (18) of the locking bar (15) and/or between them.
7. A low-voltage HRC safety load-break switch according to one of claims 1 to 6 characterised in that blocking legs (30) arranged at a spacing from each other project from the slider (5) approximately perpendicularly to the sliding direction (12) thereof (Figure 5).

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