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

Definitions

• the invention relates to a circuit breaker, in particular circuit breaker or motor protection switch, with a housing and a rotatable actuating handle arranged on the housing for a switching shaft of the circuit breaker and with a locking device against switching on the circuit breaker.
• circuit breakers are used, for example, in the connecting lines of a machine drive, so that it is possible, for example, to interrupt the power supply to the drive during a maintenance-related stay in the danger zone of the machine and to secure it against being switched on, which is usually done by hanging padlocks in corresponding locking openings of the locking device he follows.
• circuit breakers of this type have an additional device which only allows the circuit breaker to be closed in the event that the contacts of the circuit breaker have opened completely and are not welded to one another as a result of, for example, a previous high short-circuit current, and therefore the circuit breaker can no longer interrupt the power supply.
• EP 450 699 A2 a blocking device for preventing the switch-on movement of the actuating handle and a release device for the To create closing openings by means of a displaceable slide and a disk that is operatively connected to the switching shaft of the circuit breaker, the disk preventing the movement of the slide when the switch contacts of the circuit breaker are not properly opened.
• the locking device with blocking and releasing device is accommodated in the actuating handle of the circuit breaker, and the actuating handle, like the disk, is operatively connected to the switching shaft of the circuit breaker.
• a disadvantage of this known embodiment is that, on the one hand, the accommodation of the locking device in the actuating handle is associated with a high level of constructional and manufacturing expenditure, but in particular due to the actuating handle which is operatively connected to the selector shaft and which at the same time carries all the elements of the locking device, manipulator -
• the release device for the locking openings which does not open as a result of welded contacts, for example if the actuating handle is actuated with great effort and the effect of the pane which prevents the slide from moving when the switch contacts of the circuit breaker are not properly opened is canceled.
• the invention proposes a protective switch in which the actuating handle on the selector shaft is freely rotatable, the disc without play with the selector shaft is connected and the actuating handle and the disk are operatively connected to one another by means of at least one elastic claw, so that rotation of the actuating handle is transmitted via the elastic claw to the disk and from there to the selector shaft, and the slide of the locking device for Blocking the switch-on movement of the selector shaft acts on the disc.
• the actuating handle can now be turned into this off position with little effort, since it can be freely rotated on the selector shaft, but the disc arranged without play on the selector shaft does not follow this further rotation, but remains together with the selector shaft in the consequence of the restoring torque to the on position by a certain, for example approximately 10 °, angle set back position.
• a certain, for example approximately 10 °, angle set back position it is not possible to actuate the locking device, since the movement of the slide from the disk is still prevented.
• Even a greater effort on the actuating handle leads to no success, since this is not passed on by the elastic claw to the disk and thus to the selector shaft.
• the invention further proposes to connect the locking device to the housing so that it can be easily arranged in a simple unit on commercially available circuit breakers with a housing.
• To block the switch-on movement of the selector shaft it is then only necessary to allow the slide of the locking device to act on the disk that is operatively connected to the selector shaft and at the same time to release the closing openings, so that the disk can be locked in its blocked position by means of a curtain lock is.
• the invention proposes that the disc is circular with a cut-away segment and when the switch contacts are fully open, the disc is in such a position that the slide can be inserted into the free space of the cut-off circular segment and in this position the disc blocked and at the same time releases the closing openings.
• a single movement namely that of the slide, simultaneously causes the disc to be blocked and the closing openings to be released, provided that when the circuit breaker is switched off, the switch contacts open completely and the control shaft and the disc arranged thereon without play the corresponding off position take so that the slide can be moved.
• the invention proposes to design the disk at least partially in a circular manner with a raised edge extending at least over part of the outer circumference, an insertion slot being formed in the edge and the disk when the switching contacts are fully open is in such a position that the slide can be inserted into the insertion slot and in this position blocks the disc and at the same time releases the closing openings.
• the slide too, only a movement of the slide is necessary in order to block the pane and at the same time expose the closing openings.
• a holder is advantageously attached to the housing outside of the actuating handle, in which the slide is guided and in which at least one locking opening is formed for hanging the padlocks.
• the invention proposes to secure the actuating handle against being pulled off the selector shaft when the slide is in the locking position. This can be effected, for example, by a correspondingly designed projection on the slide, which prevents the actuating handle from being pulled off the selector shaft. In this way, a further possibility of manipulating the circuit breaker is eliminated, since it is not possible to remove the actuating handle on the locked circuit breaker and to cause the circuit breaker to be switched on without authorization on the switching shaft located underneath.
• the slide has a protruding pin which, when the slide is inserted into the free space of the cut-off circular segment, can be inserted into an opening formed on the actuating handle in order to secure the actuating handle in the closed position against being pulled off the selector shaft.
• Insert slot of the disc inserted slider on the upper edge of the operating handle can be placed around the Secure the operating handle in the closed position against being pulled off the selector shaft.
• the invention further proposes that hooks are attached to the housing, which grip the actuating handle on its outer wall and secure the actuating handle against being pulled off the selector shaft.
• hooks provide even greater protection against manipulation of the circuit breaker according to the invention, since the hooks continuously pulling the actuating handle away from the control shaft, i.e. prevent regardless of the position of the operating handle and the locking device.
• FIG. 1 a perspective view of a circuit breaker according to the invention with the operating handle pulled off the control shaft and the disk pulled off;
• Figure 2 is a plan view of the circuit breaker of FIG. 2;
• Figure 3 a section B-B through the circuit breaker - ⁇ äs Fig. 2;
• Figure 4 in a schematic representation of the way he locking device
• FIG. 4a fully open and Fig. 4b: not fully open switch contacts;
• Figure 5 is a plan view of another embodiment of the circuit breaker according to the invention.
• FIG. 6 shows a section C-C through the circuit breaker according to FIG. 5 and
• FIG. 7 a perspective view of a further embodiment of the circuit breaker according to the invention.
• the circuit breaker 1 has a base plate 10 on its housing front 11.
• a switching shaft 5 protrudes on the base plate 10 and is operatively connected to the interior of the circuit breaker 1 in a manner not shown.
• a guide ring 2 is fastened on the base plate 10, which serves to axially guide an actuating handle 3 when it is seated on the selector shaft 5.
• the actuating handle 3 is cup-shaped with an annular outer wall 31 and a bottom surface 32, from which a handle part 30 protrudes. In the assembled state, the actuating handle 3 lies with its upper edge 39 protruding beyond the outer wall 31 on the upper edge surface
• a disk 4 is provided which is circular along a chord 44 with a segment cut away.
• the disc 4 is placed on the base plate 10 and for this purpose has in its center a guide pin 40 which is provided with a square bore 41 which is formed corresponding to a square section 50 on the control shaft 5, so that the disc 4 with the Switching shaft 5 comes into operative connection via the bore 41 and the square section 50.
• the operating handle 3, which is above the disc 4 on the selector shaft 5th is placed, freely rotatable on this control shaft 5.
• the control shaft 5 has at its end region assigned to the actuating handle a round section 51 which is inserted into a corresponding bore 36 in the interior of the actuating handle 3, without any torque being transferable.
• the rotation of the actuating handle for switching the circuit breaker 1 on and off does not act directly on the control shaft 5.
• the washer 4, which is operatively connected to the control shaft 5 has on its side facing the actuating handle 3 a protruding elastic claw 42, which can be made of spring steel, for example.
• This elastic claw 42 engages in a corresponding recess 35 in the actuating handle 3, so that rotation of the actuating handle 3 is transmitted via the elastic claw 42 to the disk 4 and from there to the selector shaft 5 in an indirect way.
• the switching state of the protective switch 1 can be read through inspection openings 33, 43 in the actuating handle 3 or in the disk 4 from switching markings on the base plate 10.
• a locking device 6 is attached on the front side 11.
• the locking device 6 has a holder 65, in which a closing opening 60 is formed for hanging a padlock.
• this locking opening 60 is closed by means of a release device 63, which is formed on a slide 61, so that it is not possible to hang a padlock into the locking opening 60.
• the slide 61 also has a blocking device in the form of a finger 62, which is aligned with the guide ring 2 with the disk 4 arranged therein on the control shaft 5.
• the disk 4 assumes such a position that the slide 61 with its finger 62 as a blocking device along an opening 21 in the guide ring 2 into the free space of the cut off circular segment the tendon 44 can be inserted when the slide 61 is moved in the direction of arrow A.
• the finger 62 causes the disk 4 to be blocked in the off position by resting on the chord 44 of the disk 4.
• the release device 63 is moved out of the latter in the direction of the guide ring 2. so that a padlock can be hung in the closing opening 60 when the slide 61 has blocked the disc 4 in the off position.
• a cover strip 68 can also be provided on the base plate 10, which extends along the finger 62.
• FIG. 4a shows the position of actuating handle 3, disk 4 and selector shaft 5 when the switching contacts are fully open.
• the switching shaft 5 and the disk 4 which is in play-free operative connection, moves completely into the off position, so that the slide 62 can be inserted with its finger 62 along the chord 44 of the disk 4 in the direction of arrow A and the disk is locked 4 and thus the switching shaft 5 in the off position.
• the locking device can be locked by means of padlocks through the released locking openings and secured against being switched on.
• the switching shaft 5 and thus also the disk 4 assume a position shown in FIG.
• the disc 4 has an inserted slot 47 in the raised edge 48, into which a finger 62 of a slide 61 can be inserted when the slide 61, as shown in FIG. 6, is moved in the direction of arrow A.
• the insertion slot 47 in the washer 4 is formed at the point at which the washer 4 is when the switch contacts of the circuit breaker are fully open.
• the locking device 6 in turn has a holder 65 in which the slide 61 is guided.
• a closing opening 60 is formed on the holder 65, which is delimited on the upper side by a bracket 69.
• the slide 61 in turn has a release device 63 for the closing opening 60, which releases the closing opening 60 when the slide 61 moves in the direction of arrow A, so that a shackle 8 of a padlock can be inserted into the closing opening 60 and the locking device 6 in it Position is lockable.
• the finger 62 inserted into the insertion slot 47 of the disk 4 blocks a switch-on movement of the selector shaft 5 by locking the disk 4 in the position shown in FIG. 5. If the switching contacts of the circuit breaker do not open completely as a result of welding or the like, the switching shaft 5 and the washer 4 in operative connection with it assume a position moved back in the direction of the on position analogous to the example shown in FIG.
• the elastic claw 42 is fastened in a recess 38 on the actuating handle 3 and projects into a corresponding recess 45 in the disk 4.
• protruding pins 46 can also be formed in the recess 45 on the disk 4, which form additional contact surfaces for the claw 42.
• the slide 61 shown in FIGS. 1 and 2 has a protruding pin 66 parallel to the finger 62, which engages via a recess 20 in the guide ring 2 when the slide 61 moves in the direction of arrow A in the space delimited by the guide ring 2.
• the actuating handle 3 on its outer wall 31 has an opening 34 corresponding to the protruding pin 66, so that the slide 61 engages with its protruding pin 66 in the opening 34 in the actuating handle 3 when moving in the direction of arrow A, simultaneously with its finger 62 Einschalt ⁇ movement of the disc 4 blocked and the release device 63 moved out of the closing opening, so that the locking device 6 can be locked and in this position the actuating handle 3 secured by engagement of the protruding pin 66 in the opening 34 against removal from the control shaft is.
• a projection not shown for the sake of simplicity, which secures the actuating handle 3 against being pulled off the selector shaft 5 when the slide 61 is in the locked position .
• This projection can in turn be designed in the form of a protruding pin which can be placed on the upper edge 39 of the actuating handle 3 when the slider 61 is inserted into the insertion slot 47 of the disk, in order in this way to actuate the actuating handle 3 in the closed position against being pulled off the selector shaft 5 to secure.
• the invention proposes to secure the actuating handle 3 against being pulled off the control shaft 5, as shown in FIG. 7, to attach hooks 7 to the housing of the circuit breaker 1, which grip the actuating handle 3 on its outer wall and the actuating handle 3 Secure against being pulled off the selector shaft 5.
• the hooks 7 are fastened, for example, by means of screws in screw holes 70 on the base plate 10 and, with their bent hook surface 71, grip the upper edge 39 of the actuating handle 3 and thus prevent the actuating handle 3 from being pulled off the switching shaft 5 in any switching state Circuit breaker 1.
• the hooks 7 can be attached at any suitable point on the housing of the circuit breaker 1, where they

Landscapes

• Switch Cases, Indication, And Locking (AREA)
• Breakers (AREA)
• Push-Button Switches (AREA)
• Slide Switches (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7785899

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (7)

Family Cites Families (4)

• 1996
  • 1996-02-21 DE DE19606271A patent/DE19606271A1/de not_active Withdrawn
• 1997
  • 1997-01-22 EP EP97901075A patent/EP0882301B1/fr not_active Expired - Lifetime
  • 1997-01-22 DE DE59700623T patent/DE59700623D1/de not_active Expired - Fee Related
  • 1997-01-22 CN CN97192457A patent/CN1067485C/zh not_active Expired - Fee Related
  • 1997-01-22 WO PCT/EP1997/000291 patent/WO1997031382A1/fr not_active Ceased
  • 1997-01-22 AT AT97901075T patent/ATE186153T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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