Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H1/00—Contacts
  • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
  • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
  • H01H1/20—Bridging contacts
  • H01H1/2041—Rotating bridge
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
  • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
  • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/62—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
  • H01H71/64—Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement incorporating toggle linkage

Definitions

• the invention relates to a switch according to the preamble of patent claim 1.
• the invention relates in particular to a low-voltage switch with a blocking element which prevents the transfer of an actuating handle into the switch-off position when the contacts of the switch are blocked.
• Low-voltage switch has in particular an operating lever that can be moved by an actuating handle, which acts on a knee joint by means of a drive spring, which is connected at one end to a contact carrier shaft and, at the other end, is supported on a ratchet lever, with which the overcurrent release of the low voltage nscsscanner is controlled .
• the knee joint has a knee: lascne, which is arranged in the same plane as the locking tab, in such a way that one end of the locking tab is rotatably mounted ar lock housing and the other end is coupled to the drive neoel.
• the locking tab With a further movement of the actuating handle in the switch-off direction, the locking tab generates a moment on the knee joint tab in the switch-off direction, so that the actuating handle can only be moved in the switch-off direction when the contact welding breaks open.
• This construction thus mechanically prevents the actuation handle from moving into the OFF operating position when the contacts are welded, so that a person checking the low-voltage switch can easily recognize this state in order to carry out corresponding repair measures.
• the object of the invention is to provide a low-voltage switch in which the transfer of the actuating lever into the switch-off position can be prevented even more reliably in the event of a welding of the contacts.
• FIG. 1 shows a sectional view of a low-voltage switch according to the exemplary embodiment in the switched-on state, in which the actuating lever is in the ON operating position;
• FIG. 2 is an enlarged perspective view of an inner assembly of the low-voltage switch shown in FIG. 1, in which springs are tensioned between an axis attached to the actuating lever and a knee joint axis in order to simultaneously actuate the knee joint tabs and a ratchet lever;
• FIG. 3 shows an enlarged perspective view of the assembly shown in FIG. 2, which additionally shows the assembly of the side plates of the drive housing and the release device which interacts with the latch lever;
• Fig. 4 is a perspective view of the low voltage switch shown in Fig. 1; 5 shows a sectional view of the low-voltage switch in the switched-off state, in which the actuating lever assumes an operating position;
• FIG. 6 shows a sectional view of the low-voltage switch in its transitional operating position, in which, due to contact welding, a switched-on state is still present and displacement of the actuating lever in the operating position OFF is prevented;
• a movable contact 1 of the low-voltage switch is rotatably mounted on the axis 2 of a control shaft 3.
• the selector shaft 3 is itself mounted in a pole track housing, not shown.
• the selector shaft 3 has two diametrically opposite satellite axes 4 and 5, which are rotated about the axis 2 when the selector shaft 3 rotates.
• the axis 4 is the point of application of a knee joint plate 6, which is articulated at its other end by means of a knee joint axis 7 to a second knee joint plate designed in the form of a triangular element 8.
• the triangular element 8 is articulated at a second corner by means of an axis 9 to a ratchet lever 10, which is used for overcurrent release of the switch lock and is rotatably mounted on a fixedly positioned axis 11.
• the triangular element 8 consists of two mutually parallel mirror-like plates, between which the latch lever 10 is received and mounted on the hinge axis 9, which firmly connects the plates together.
• the plates are connected by means of a pin 12 which is connected to the ratchet lever 10 can be brought into contact to limit the movement of the triangular element 8.
• a drive lever 13 shown in detail in FIG. 2 consists of two plates which extend in the respective planes from two side plates 15 of the drive housing and are supported in an articulated manner with their lower sections 13a shown in FIG. 4 on corresponding bearing sections 14 of the side plates 15 of the drive housing are.
• the drive lever 13 consists of a single U-shaped plate, on the connecting section of which a bolt 16 and an actuating handle 17 which is led out of the drive housing are attached.
• a drive spring 18 is arranged on each side of the triangular element 8 between the knee joint bolt functioning as axis 7 and the bolt 16 of the drive lever 13.
• the housing side plates 15 and the lower sections 13a of the drive lever 13 are also arranged on both sides of the triangular element 8.
• a triggering device is identified in FIG. 1 by reference number 19. With this release device, the release of the ratchet lever 10 is controlled in a manner known per se.
• the actuating handle 17 In the operating position ON shown in FIGS. 1 and 4, the actuating handle 17 is in a position tilted to the left, so that the force line of action of the spring 18 runs to the left of the axis 9. Since, in the ON operating position, the pawl lever 10 cannot perform a counterclockwise upward movement as a result of an engagement with the triggering device 19 as a result of the spring force acting via the triangular element 8 and the axis 9, the spring force shifts to a clockwise direction Directed rotary movement of the triangular element 8 about the axis 9. The axis 7 is forced to cross the line connecting the axes 9 and 4, which leads to a - as explained above - blocked latch lever 10 that the knee joint 6 on the selector shaft 3 acts in the closing direction of the movable contact 1.
• Fig. 5 shows the operating position LOST.
• the low-voltage switch comes into this operating position after the latch lever 10 has been released by the release device 19.
• the actuating handle 17 assumes the position shown in FIG. 5.
• the triangular element 8 together with the pawl lever 10 and the knee joint plate 6 articulated thereon is pulled upwards, which leads to a rotation of the control shaft 3 and thus to a separation of the movable contact 1.
• a locking lever 20 is arranged on the outside of one or both rare plates 15 of the anti-friction housing, which has one end on the satellite axis 5 of the selector shaft 3 and the other end on one Fixed pin 21 is articulated.
• the pin 21 is attached to the side plate 15 and in a formed in the locking lever 20 Elongated hole 22 out.
• a projection 23 is formed, which can be brought into engagement with a receiving section 24 formed on the drive lever 13. Thanks to this construction, the safe disconnection of the contact 1 indicating the final operating position OFF of the actuating handle 17 shown in FIG. 7 is prevented in the following way:
• the operating handle 17 is first shifted clockwise until the sections 24 and 23 come into engagement.
• a compressive force is consequently exerted directly by the operating handle 17 via the drive lever 13 on the locking lever 20 and thus a torque acting on the selector shaft 3 in the clockwise direction is generated via the axis 5.
• this torque is very small due to the relatively short distance between axes 2 and 5, the separation resistance at contact 1 on actuating handle 17 caused by micro-welding is clearly noticeable. Accordingly, a person who tries to turn off the switch is immediately able to recognize that the operating handle 17 cannot be brought into the end operating position OFF.
• the locking lever 20 assumes the position shown in FIG. 5, so that the actuating handle 17 together with the drive lever 13 can pass into the end operating position OFF shown in FIG. 7 without hindrance.
• a pin 25 attached to the drive lever 13 engages with the pawl lever 10 and pushes the latter downwards clockwise until the pawl lever 10 assumes a blocking position in the release device 19.
• a switch is equipped with a drive lever 13 which can be actuated by an actuating handle 17 and which acts by means of a drive spring 18 on a knee joint 6, 7, 8 which provides an operative connection between a control shaft 3 for actuation a contact 1 and a latch lever 10 for controlling the overcurrent release.
• the switch also has a with "the drive lever 13 cooperating locking lever 20 which prevents the transfer of the operating handle 17 to the open position in case of blocked contact 1, wherein the locking lever 20 automatically by rotation of the control shaft 3 during the closing of the contact 1 in its locking position with respect can be brought to the drive lever.

Landscapes

• Mechanisms For Operating Contacts (AREA)
• Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Breakers (AREA)
• Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7880684

Family Applications (1)

Country Status (8)

Families Citing this family (9)

Citations (4)

Family Cites Families (4)

• 1998
  • 1998-09-11 DE DE19841685A patent/DE19841685C2/de not_active Expired - Fee Related
• 1999
  • 1999-08-09 HU HU0103736A patent/HU223108B1/hu not_active IP Right Cessation
  • 1999-08-09 WO PCT/EP1999/005829 patent/WO2000016358A1/de active IP Right Grant
  • 1999-08-09 EP EP99944361A patent/EP1110230B1/de not_active Expired - Lifetime
  • 1999-08-09 JP JP2000570802A patent/JP4321965B2/ja not_active Expired - Fee Related
  • 1999-08-09 AU AU57325/99A patent/AU5732599A/en not_active Abandoned
  • 1999-08-09 CN CN99810718.2A patent/CN1208799C/zh not_active Expired - Lifetime
  • 1999-09-10 TW TW088115646A patent/TW493190B/zh not_active IP Right Cessation

Patent Citations (4)

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