Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
  • H01H3/04—Levers
  • H01H3/06—Means for securing to shaft of driving mechanism
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/54—Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts
  • H01H3/58—Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts using friction, toothed, or other mechanical clutch
• • 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
  • H01H9/22—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
• • 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
  • H01H9/22—Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
  • H01H9/223—Defeatable locking means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H3/00—Mechanisms for operating contacts
  • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
  • H01H3/0253—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch two co-operating contacts actuated independently

Definitions

• the invention relates to a lever for a disconnector comprising a handle part which is arranged to turn between a first position and a second position, whereby the lever for the disconnector is arranged to control contacts of the disconnector to be in an open position in the first handle part position and in a closed position in the second handle part position, and which handle part is provided with a position indicator and a lock latch wherewith the handle part may be locked into place the handle part remaining in the open position.
• the invention also relates to a disconnector.
• the disconnector is a switching device by means of which an electric load may be disconnected from an electric circuit, when the disconnector is without current.
• the disconnector provides a visible opening space between the contacts of the disconnector.
• connection is to be interpreted broadly in this connection.
• said term also covers, for instance, a switch disconnector, which is required to have a given switching and interrupting capacity and also properties required of a disconnector.
• switch disconnector which is required to have a given switching and interrupting capacity and also properties required of a disconnector.
• the above- described low-voltage switch disconnector is also known as a disconnecting switch.
• the disconnector has to be furnished with a reliable position indicator.
• the open position refers here to a position in which the contacts of the disconnector are apart from one another, i.e. there is a visible opening space between the contacts. This feature is defined in standard IEC 60947-1 7.1 .7.
• the actuating moment of the disconnector lever of a switch used as disconnector has to be set relatively high in order to achieve a sufficient contact speed and hence a sufficient capacity of disconnecting in the required class.
• Reliable indication of a position and fulfilment of a locking option in turn, require a relatively short lever.
• the above details as a whole contribute to the fact that the lever for the disconnector is excessively short for the actuating moment, i.e. it is difficult to readily control the disconnector lever.
• a drawback with the above known solutions is that they are complex, which causes increased costs. Moreover, operating characteristics of the above prior art solutions are not so good as possible.
• the object of the invention is to provide a lever for a disconnector and a disconnector by which the prior-art disadvantages can be eliminated. This is achieved by means of the lever for the diconnector and the disconnector in accordance with the invention.
• the lever for the disconnector of the invention is characterized in that the handle part is furnished with a detachable extension part that is arranged to prevent the use of a lock latch in the handle part during operation.
• An advantage of the invention is above all its simplicity, which makes the adoption and use of the invention advantageous.
• the simple structure also results in high reliability of operation.
• a further advantage of the invention is that the invention may be applied in connection with all known disconnector levers in an advantageous manner.
• the usability of the lever will be substantially improved over prior art, because the length of the lever is no longer a limiting factor for achieving a lockable disconnector feature. This appears to the operator in such a way that the disconnect- or is lighter to control than before and a possibility of locking errors is eliminated.
• Figures 1 and 2 show schematically a disconnector which employs a first embodiment of the invention
• Figure 3 shows schematically a disconnector which employs a second embodiment of the invention
• FIGS. 4 to 6 show schematically a handle part in accordance with the embodiment of Figure 3,
• FIGS. 7 and 8 show schematically a handle part in accordance with a third embodiment of the invention
• FIGs 9 and 10 show schematically a disconnector which employs the handle part in accordance with Figures 7 and 8,
• Figures 1 1 and 12 show an alternative implementation to the embodiment of Figures 1 to 6 and
• Figures 13 to 16 show an alternative implementation to the embodiment of Figures 7 to 10.
• Figures 1 to 2 show, in principle, a disconnector employing a disconnector lever in accordance with a first embodiment of the invention.
• the disconnector is generally denoted by reference numeral 1 .
• the disconnector 1 has a disconnector lever that comprises a handle part 2.
• Figure 3, in turn, is a general view of a disconnector which employs the disconnector lever in accordance with the second embodiment of the invention.
• the handle part 2 employed in the application of Figure 3 is shown in greater detail in Figures 4 to 6.
• the handle part 2 of the disconnector lever is arranged to turn between a first position and a second position, whereby the disconnector lever is arranged to control the contacts of the disconnector 1 to be in an open position in the first position of the handle part 2, and in a closed position in the second position of the handle part 2.
• the handle part 2 is also furnished with a position indicator 3 and a lock latch 4, by means of which the handle part 2 may be locked into place the handle part remaining in the open position.
• Disconnector contacts are inside the disconnector 1 , so they are not visible in the figures.
• the position indicator may be provided in many different ways, for instance, the handle part may include a sign that moves, when turned, to a specific point, the whole handle part may serve as the position indicator, etc.
• lock latch 4 The purpose of the lock latch 4 is to enable locking of the handle part to the open position. Locking may take place, for instance, by lifting the lock latch to the locking position and arranging a padlock, for instance, into an opening 6 of the latch. The principle of this situation is shown in Figure 5, for instance.
• the extension part 5 may be arranged to form a one-sided handle, in other words a one-hand-operated lever, or a two-sided handle, i.e. a two-hand-operated lever.
• the one-hand-operated lever refers here to a handle type, in which a detachable extension part 5 is arranged to provide an extension only on one side of the pivoting axis of the handle part 2.
• the two-hand- operated lever in turn, refers to an application, in which the detachable extension part 5 is arranged to provide an extension on both sides of the pivoting axis of the handle part 2.
• the extension part 5 prevents the lock latch 4 from being lifted during control, in other words, when the extension part 5 is mounted on the handle part 2 and the handle part is turned.
• Operation of this kind prevents locking during a switch control. For instance, in a situation, in which the disconnector contacts are engaged in the closed position and when the handle part is turned towards the open position, it is not even possible to try to lift the lock latch 4 for locking. After the control step, in other words in a situation, in which the control force no longer acts on the handle part, the extension part 5 may be withdrawn, whereby locking will be possible. This situation is shown, in principle, in Figure 5.
• Figures 1 to 6 show an application, the basic principle of which is that the detachable extension part 5 is arranged for mounting on the handle part 2.
• the extension part may be pressed, for instance, on the handle part 2, as shown in Figures 4 to 6.
• the application, in which the extension part 5 is arranged on the handle part 2 may also be provided such that, in the situation of the figures, the extension part is horizontally slipped onto the handle part 2.
• Figures 7 to 10 show an application whose basic idea is that the detachable extension part 5 is arranged to surround, at least partly, the handle part 2.
• the same reference numerals are used in Figures 7 to 10 as in Figures 1 to 6 to refer to the corresponding parts.
• Figures 7 to 8 show, in principle, a handle part 2 and an extension part 5 of this application and Figures 9 to 10 show correspondingly a disconnector that is furnished with a disconnector lever employing the application of Figures 7 to 8.
• the invention may be used in connection with various disconnectors.
• the invention may be applied, in principle, in the following manner.
• the structure includes, for instance, two switches in superposition, in connection with said structure the actuating moment is at least double in comparison with a single switch.
• a test force is three times the normal actuating moment. In that case an approximately sextuple force is exerted on a single switch.
• the switch structure does not stand said force, but the control mechanism of the switch breaks down, and consequently, the indication of position may be erroneous. A situation of this kind is not allowable, because it may lead to serious hazards.
• Figures 1 1 to 16 Such applications of the invention are shown in Figures 1 1 to 16.
• the application of Figures 1 1 to 12 is based on the application of Figures 1 to 6, in other words on the application, in which the extension part 5 is attached from above onto the handle part 2.
• the application of Figures 13 to 16, in turn, is based on the application of Figures 7 to 10, in other words, on the application, in which the extension part 5 is horizontally slipped onto the handle part 2.
• the locking means are provided by edges 8, 9. This is not the only option, however, but it is possible to form the locking means in some other manner, for instance, by providing surfaces in the upper surface of the handle part and mating surfaces in the lower surface of the extension part, which surfaces interlock when the extension part is pressed onto the handle part.
• the above-described detachment of the handle part 5 is implemented by providing at least one weakening point 10 in the locking plate 7.
• the weakening point is provided by means of two weakening grooves, as appears from Figure 15. Naturally, it is also possible to use only one weakening groove, etc.
• the weakening points give in and the locking plate detaches, whereby the extension part 5 detaches before the switch will break down. Also in this application the indication of position will be retained. Also in this application the detachment of the extension part 5 at the right time is provided by a specific construction of locking, in other words, by furnishing the locking element with weakening points. Selection of the material of which the extension part is manufactured also contributes to the detachment of the extension part at the right time.

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• Breakers (AREA)
• Knives (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Applications Claiming Priority (2)

Publications (3)

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ID=48872921

Family Applications (1)

Country Status (4)

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Family Cites Families (10)

• 2012
  • 2012-01-23 FI FI20125070A patent/FI124010B/fi active IP Right Grant
• 2013
  • 2013-01-21 CN CN201380006387.5A patent/CN104067364B/zh active Active
  • 2013-01-21 WO PCT/FI2013/050064 patent/WO2013110855A1/en active Application Filing
  • 2013-01-21 EP EP13741046.0A patent/EP2807665B1/de active Active

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