Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/20—Interlocking, locking, or latching mechanisms
  • H01H9/28—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
  • H01H9/281—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member making use of a padlock
  • H01H9/282—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member making use of a padlock and a separate part mounted or mountable on the switch assembly and movable between an unlocking position and a locking position where it can be secured by the padlock
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/20—Interlocking, locking, or latching mechanisms
  • H01H9/28—Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
  • H01H2009/288—Provisions relating to welded contacts

Definitions

• Circuit breaker with actuating handle that can be secured against being switched on
• the invention relates to a circuit breaker, in particular a circuit breaker or motor protection switch, with a housing and a rotatable actuating handle which is arranged on the housing and can be secured against being switched on by locking it with at least one padlock.
• Circuit breakers of this type are used, for example, as safety switches on machines and are arranged, for example, in the power supply to drive motors. In the case of maintenance and repair work, the installers are thus able to interrupt the power supply for the duration of the work on the machine by means of the safety switch and to secure this safety switch against being switched on, for example by means of a locking device with padlocks.
• a known embodiment of such a circuit breaker uses an actuating handle, which is arranged as a rotary handle in a cup-shaped manner in a cylinder guide of the housing, one or more bores being arranged in the cylinder wall and the wall of the cup-shaped actuating handle, which are in the A us position of the circuit breaker correspond to each other and allow the insertion of a padlock, so that the circuit breaker can be locked in this off position.
• circuit breakers used as circuit breakers, the problem arises that they can be welded to one another at their contact points, for example as a result of a briefly occurring high short-circuit current, and that when the circuit breaker is switched off, the corresponding switching movements are carried out, the contacts inside the circuit breaker However, they are not separated from each other and the machine connected to the circuit breaker remains connected to its power source despite the circuit breaker being switched off and represents a danger to persons working on the machine. It is therefore required that motor circuit breakers and circuit breakers are protected as circuit breakers in such a way that they enable the detection of welded contacts and do not permit the closing of such a welded switch.
• a disadvantage of this circuit breaker is that the mechanism used with cam, cam and pawl controlled via it is complicated on the one hand in production and therefore leads to high costs in production, and on the other hand the circuit breaker is easy to manipulate, for example when the operating handle is forced into its correct off position is brought and held here and then the locking device is actuated inadmissibly against switching on.
• GB-PS 1 528 692 describes a cover for locking a circuit breaker, which can be equipped, for example, with a rotary handle. This cover is placed as a loose part on the actuating handle to be locked. This has the major disadvantage that the lid can easily be lost.
• the object of the invention is therefore to further develop the known circuit breakers in such a way that locking or manipulation for the purpose of closing the circuit breaker in the case of welded contacts is reliably prevented, so that safe, safe working on the machine protected by the circuit breaker is possible .
• a hinged cover to the housing of the circuit breaker, which has a sufficient size to cover the actuating handle and is used for closing by means of the padlocks. Furthermore, the cover has a recess for immersing the actuating handle, the recess is aligned in accordance with the position of the actuating handle in its off position when the contacts of the protective switch are fully open, ie actuating handle in the "off" position and contacts are not welded, and the actuating handle can only be immersed in the opening of the cover in its off position and the cover can only be moved into the closed position by means of the padlocks when the circuit breaker is fully open, when the actuating handle is in its off position.
• the actuating handle when turned to its off position, always jumps out of its off position due to the strong springs arranged in the interior of the switching device a certain amount (angle) back towards the on position, this angle usually being about 5 to 10 ° when welding a bridge contact on one side and about 15 to 25 ° when welding a bridge contact on both sides.
• the cover can be move completely onto the actuating handle in its closed position, since the actuating handle can dip into the correspondingly arranged recess, and can be locked with the padlocks. In this position, the cover, due to its size selected according to the actuating handle, completely covers it and prevents the protective switch which has been locked according to the invention from being switched on, since it is no longer accessible from the outside.
• a hinge-like receptacle with a pivot axis for the lid be attached to the housing next to the actuating handle to be covered. In this way, correct guidance of the cover and the maintenance of the desired orientation of the recess in the cover for the actuating handle are ensured and the cover is captively connected to the circuit breaker.
• a projecting flange on the housing next to the actuating handle on the side opposite the pivot axis and to provide the flange with at least one opening for pushing through a padlock each.
• the cover has a slot for pushing the flange through in the closed position of the cover, so that the push-through openings for the padlocks are in the closed position above the cover.
• the invention also proposes to protrude the cover on its side facing the actuating handle with projecting bulkheads. form, which isolate the operating handle in the closed position on all sides from the environment.
• manipulation of the circuit breaker according to the invention is prevented to the extent that it is usually not possible to bring and hold the actuating handle, which is inclined as a result of welded contacts, into its correct position, for example by means of a screwdriver, during the movement of the cover in the direction of its closed position and to be able to move the lid into its closed position after all, since such a manipulation object collides prematurely with the partition walls of the lid and it is impossible to close the lid.
• the bulkheads of the cover advantageously have such a length that they sit on the front of the housing, at least in some areas, in the closed position of the cover.
• the operating handle is not accessible from the outside, since it is surrounded by the cover and the bulkheads.
• At least one integrally formed web is advantageously formed on the flange, which rests on the housing and covers at least one screw connection of the housing. In this way it is prevented that when the circuit breaker is closed The housing cannot be opened without being destroyed and the contacts that are switched off are bridged.
• the invention proposes to form, at least on the upper edge of the actuating handle facing the flange, a latching lip which protrudes above the upper side of the actuating handle, and furthermore on the cover on the boundary edge of the facing the flange Form recess a protruding locking edge.
• the locking lip prefferably protrude in a wedge-shaped manner towards the outer edge of the actuating handle and protrude above the upper side of the actuating handle.
• the bulkheads of the cover are designed at such a height as a further safeguard that when the cover is in contact with the latching lip when the operating handle is in position, the bulkheads already cover the operating handle to such an extent that it is no longer accessible from the outside and therefore manipulation cannot take place.
• the invention makes it possible to keep the manufacturing costs of a circuit breaker or motor circuit breaker designed as lockable in accordance with the invention low, since the closure device according to the invention for the circuit breakers or motor circuit breakers manufactured in large series only additionally at the switch in the 2-3% desired cases of the total production need to be attached without having to make changes within the switch.
• FIG. 1 a perspective view of a front view of a circuit breaker with an operating handle designed as a circuit breaker;
• Figure 2 a top view of the circuit breaker with fully open contacts with closed
• FIG. 3 shows a section through the circuit breaker according to FIG 2 along the line AA.
• FIG. 4 a top view of the circuit breaker with welded contacts according to FIG. 1;
• FIG. 5 a side view of the circuit breaker according to FIG. 4.
• the circuit breaker 1 is housed in a housing 6.
• a protruding cylindrical guide socket 10 is formed, which is seated on the housing 6 on the front 6a with a molded flange 10a.
• the actuating handle 3 with its integrally formed cup-shaped guide element 3a is inserted in the guide socket 10 and is rotatably guided about the axis of rotation X, see FIG. 2.
• the cup-shaped guide element 3a is also seated on the upper edge of the cylindrical guide stub 10, for example with a slightly flared edge.
• the actuating handle 3 is operatively connected to a switching shaft inside the circuit breaker 1 via a screw 31, the switching state being able to be read through a viewing window 30 in the bottom area of the molded-on guide part 3a and the markings on the housing underneath.
• a structure of a circuit breaker 1 is common. It is also possible to arrange the guide socket 10 with the actuating handle 3 by 180 ° with respect to the position shown on the front of the housing 6.
• circuit breaker 1 In order to operate such a circuit breaker, for example in cooperation with a machine, it must be provided with a device which allows the circuit breaker 1 to be locked when it is switched off, ie when the contacts are opened properly.
• the circuit breaker 1 with the cover 2 shown in the figures equipped which is pivotally mounted on a receptacle 5, which is fastened to the front plate 6a of the housing 6 with screws 50.
• the receptacle 5, see FIG. 3 has a pivot axis 52 about which the cover 2 is pivotally mounted.
• the cover 2 is held in the opened position by a return spring 51 which is fastened on the pivot axis 52 of the receptacle 5 and engages on one side on the receptacle 5 and on the other side on the cover 2, see FIG. 1.
• the cover 2 has such a size that it can be pivoted over the actuating handle 3 including the molded cup-shaped guide element 3a for the purpose of closing and completely covers it in this position and in this position the circuit breaker should then be lockable against being switched on.
• a projecting flange 4 is also fastened to the housing 6 by means of a screw 43 on the side of the actuating handle 3 opposite the receptacle with the pivot axis 52.
• the flange 4 is arranged at a short distance next to the cylindrical guide stub 10 and projects in the same direction as the actuating handle over the housing surface.
• the flange 4 is designed as an angle with a cover web 44, which starts at an angle from the projecting flange and rests on the front side 6a of the housing, to which it is also screwed to the housing.
• the flange 4 has in its upper region three bores 41 arranged next to one another for pushing through a padlock each.
• the cover 2 has a slot 24 in its front area, that is to say opposite the pivot axis, through which the area of the flange 4 with the bores 41 can be pushed through when the cover 2 is pivoted into its closed position, ie into its position covering the actuating handle, and the flange area with the holes 41 for the padlocks is above the cover 2 - with the cover closed - and the padlocks are hooked into the holes 41 and the cover can be locked in this position.
• a slot 24 in its front area that is to say opposite the pivot axis, through which the area of the flange 4 with the bores 41 can be pushed through when the cover 2 is pivoted into its closed position, ie into its position covering the actuating handle, and the flange area with the holes 41 for the padlocks is above the cover 2 - with the cover closed - and the padlocks are hooked into the holes 41 and the cover can be locked in this position.
• the actuating handle 3 is raised in relation to its surroundings, i.e. it projects beyond the cup-shaped guide element 3 and the guide connector 10.
• the cover 2 has a recess 22 which is designed as a bulge of the cover on its upper side, in the example shown as a groove-shaped recess. The size of this recess is sufficient so that the actuating handle 3 can engage or immerse in this recess.
• the arrangement of the recess 22 in the cover 2 is such that when the cover is closed over the flange 4, the actuating handle 3 can only dip into the recess 22 when the actuating handle is in its off position, which is the fully open position Circuit breaker corresponds, that is, with non-welded contacts.
• the recess 22 is designed as a groove-shaped recess which extends parallel to the position of the actuating handle 3 in the off position. As can be seen in FIGS.
• the cover 2 can only be brought into its closed position shown there if the actuating handle 3 engages exactly in the recess 22 in the cover and this is only due to the arrangement and format of the recess 22 in the cover possible when the switch is fully open, ie the operating handle 3 is in the off position.
• the recess 22 is only so wide that the actuating handle fits straight in, but so long, i.e. Continuously formed in the lid that the actuating handle can be received both in the position shown and in a position rotated by 180 °.
• the cover 2 is provided on its underside with side-by-side bulkheads walls 20 and a front bulkhead 27 which delimits the side opposite the receptacle and which is recessed relative to the front edge 26 of the cover.
• the bulkheads 20 and 26 are delimited in their corner regions via corner bulkheads 21 as well as for receiving 5 with corner bulkheads 21.
• the bulkheads 20, 21, 27 together with the receptacle 5 make it possible to completely cover the actuating handle 3, including the cylindrical guide stub 10 in which the actuating handle 3 is inserted, when the cover is folded over the actuating handle. When the actuating switch is covered by the cover, it can no longer be manipulated from the outside.
• the actuating handle is then locked away, as can be seen from the views according to FIGS. 2 and 3.
• the push-through slot 24 for the flange 4 is formed between the front edge 26 and the front bulkhead side 27 of the cover 2.
• the Schott ⁇ wall 27 is inserted when the lid is closed between the gap between the flange 4 and the guide stub 10.
• the circuit breaker 2 shows the circuit breaker in a top view in a position secured and closed against being switched on.
• the actuating handle 3 is in its off position, ie the circuit breaker is fully open and the contacts are not welded.
• the off position of the actuating handle 3 is to be selected such that the actuating handle is arranged with its longitudinal axis Y parallel to the pivot axis 52 of the receptacle 5 of the cover 2.
• the cover is completely folded over the actuating handle and the guide socket 10 receiving it, the part of the actuating handle 3 projecting over the guide socket 10 being inserted into the Cover 2 formed recess 22 is immersed and covered by this.
• the recess 22 is formed in such a size and arrangement on the lid that it only in the position shown in FIGS. 2 and 3 of the actuating handle this can accommodate.
• the recess 22 is designed as a groove-shaped bulge in the cover, which likewise runs parallel to the longitudinal axis Y of the actuating handle, with a width which is somewhat greater than the maximum width of the actuating handle.
• the bulkheads 20, 21, 27 together with the receptacle 5 partition off the actuating handle with guide stub 10 on all sides, the bulkheads resting at least partially on the housing surface of the housing 6 or to get close to them.
• the bulkhead 27 is inserted between the guide stub 10 and the flange 4 in the gap there and the flange 4 is guided through the slot 24 of the cover with the area in which the push-through holes 21 are located, so that the holes 41 are above of the lid and after inserting padlocks, the lid 2 can be locked in the positions shown in FIGS. 2 and 3.
• the actuating handle 3 is hidden under the cover and is therefore no longer accessible to manipulation. In this way, switch 1 is secured against being switched on.
• the actuating handle 3 assumes a different position from the position of the actuating handle 3 just described when the circuit breaker 1 is open. This position of the actuating handle 3 is shown in FIGS. 4 and 5. Due to the welded contacts in the circuit breaker 1, the contacts no longer open and the actuating handle 3 is held in the position of the circuit breaker 1 in a direction turned back about 5 to 10 ° in the direction of the switch-on position by means of strong springs. This effect can always be observed in the conventional circuit breakers with a rotatable operating handle.
• the easy in terms of correct The position of the operating handle 3 rotated from the position in contrast to its position when the circuit breaker 1 is fully open has the result that when the cover 2 is moved in the direction of its closed position, parts of the raised operating handle 3 no longer enter the recess 22 in the Engage the cover, but collide with the boundary edges 22a of the recess 22. As can be seen in particular from FIG. 5, the cover 2 cannot be brought into its closed position, as a result of which the holes 41 in the flange 4 for the padlocks do not appear on the top of the cover 2 and the circuit breaker 1 is not closed can be.
• the actuating handle 3 has on its upper side on its edge facing the flange 4 and on the opposite edge a detent lip 32 which protrude above the upper side of the actuating handle 3. Furthermore, a protruding latching edge 25 is formed on the cover 2 on the boundary edge 22a of the recess 22 facing the flange 4, which with the circuit breaker open and welded contacts, as shown in FIGS. 4 and 5, with the latching lip 32 of the Actuating handle 3 comes into operative connection. In this way it is prevented that the actuating handle 3 springs back into its position corresponding to a fully open circuit breaker by pressing firmly on the cover 2 sitting on its upper side, and that it would therefore be possible to close the circuit breaker despite welded contacts.
• the latching lip 32 of the actuating handle can also be designed to rise in a wedge shape towards the outer edge of the actuating handle, thereby increasing the effectiveness of the operative connection.
• the bulkheads 20, 21, 27 projecting from the cover are of such a height that when the cover 2 is in contact with the locking lip 32 of the actuating handle 3 due to welded contacts in the circuit breaker 1, the bulkheads 20 , 21, 27 already cover the operating handle 3 to such an extent that it is no longer accessible from the outside. It is therefore not possible to hold the actuating handle in position with a suitable object, such as a screwdriver, in accordance with the open circuit breaker and then to place the cover 2 on the correctly positioned actuating lever 3, since the bulkheads collide with the object at an early stage and thereby a further closing of the lid 2 is impossible.
• a suitable object such as a screwdriver
• the housing and the cover can therefore not be opened in this position.
• These parts can only be assembled or disassembled when the cover 2 is open, ie after all padlocks have been removed from the bores 41 in the flange 4.
• the flange 4 also covers, with its integrally formed web 44, which rests on the housing 6, a screw connection 13b with which the front plate 6a is connected to the other housing parts 6 of the circuit breaker 1.
• the flange 4 has two protruding pins 45 along its web 44 on its side facing the housing 6, which pins extend into corresponding recesses 11 in the front plate 6a of the
• the flange 4 Furthermore, on its side facing the actuating handle 3, the flange 4 has reinforcing ribs 40 which, when the cover 2 is closed, fit into corresponding ribs 40
• Intervene cover 2 and enable improved guidance of the cover when moving into its closed position.
• a circuit breaker 1 is created which is very simple and inexpensive, for example after injection molding.
• Process made of thermoplastic, lockable device can be manufactured against switching on, which can also be retrofitted to existing circuit breakers, for example for use as a safety switch.
• the invention allows the circuit breaker to be locked away only when the contacts are fully open and offers a particularly high degree of security against manipulation attempts, for example in order to want to lock the circuit breaker despite the welded contacts.
• the invention described above is not limited to the exemplary embodiment shown in the figures, but can also be applied to other types of circuit breakers.
• an actuating handle instead of the actuating handle described, which is raised in relation to its surroundings, which does not protrude beyond the areas surrounding it.
• the cover has correspondingly shaped areas which engage in the recessed grips which are necessarily present next to the actuating handle and also has a recess between these areas into which the actuating handle can only be inserted in the off position, analogously to what has been described above which it assumes with a fully opened circuit breaker without welded contacts and thus the desired security against switching on with welded contacts and against manipulation is achieved.

Landscapes

• Breakers (AREA)
• Switch Cases, Indication, And Locking (AREA)
• Walking Sticks, Umbrellas, And Fans (AREA)
• Lock And Its Accessories (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7781544

Family Applications (1)

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Family Cites Families (5)

• 1995
  • 1995-12-28 DE DE19548948A patent/DE19548948C2/de not_active Expired - Fee Related
• 1996
  • 1996-12-06 AT AT96943893T patent/ATE186610T1/de active
  • 1996-12-06 CN CN96199801A patent/CN1065647C/zh not_active Expired - Fee Related
  • 1996-12-06 WO PCT/EP1996/005461 patent/WO1997024741A1/fr active IP Right Grant
  • 1996-12-06 EP EP96943893A patent/EP0870313B1/fr not_active Expired - Lifetime
• 1999
  • 1999-05-28 HK HK99102394A patent/HK1017482A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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