JPS5868830A - Electric switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises at least one fixed contact, a movable contact mounted on a swingably supported holder, and one
The present invention relates to an electric switch having an opening/closing lock mechanism including a lever that can be driven by a manual edge mechanism and a latch lever that can be released by a tripping mechanism.

A switch of this kind is known, for example, from German Patent Application No. 2757696. The switch described in this publication belongs to the group of low-voltage protection or power switches, so-called switches of compact construction, which have an approximately rectangular segmented case made of insulating synthetic resin. Connection devices for external conductors are located on opposite front sides of the case. Instead of a center of rotation located inside the case, an operating handle that can swing in a circular orbit protrudes through a hole in the lid of the case and can assume four different positions depending on the operating state of the switch.

The four types of positions are 1. A closed position caused by manual operation, 1. An open position caused by manual operation, a tripped position between the closed and open positions caused by automatic side removal, and a position beyond the open position. This is the reset position used for relatching the opening/closing mechanism after a trip.

The central feature of the opening/closing locking mechanism of the switch according to the above publication is a toggle link mechanism supported at one end by the boulder of the movable contact and at the other end by a latch lever.

A spring is arranged between the knuckle pin and the swing lever that supports the manual operation mechanism. Swinging of the swinging lever changes the direction of action of the spring force on the knuckle bin so as to bring the toggle linkage into a straight or bent position. These two positions correspond to the closed and open positions of the movable contact. On the other hand.

When the latch lever is released by the tripping device, the toggle linkage moves as a whole under the action of the spring, so that the movable contact likewise reaches the open position.

By the way, the toggle link mechanism is not only used as the main component of the opening/closing lock mechanism of a switch with a combination structure, but is also commonly used in various types of switches.
ikl″ 8th edition, 1960, Part 9, Vl Chapter 11 “Opening/Closing Lock”).

The latching of a toggle linkage is carried out by another smaller toggle linkage - or by a latch, in which case several latches are generally arranged one after the other in order to minimize the forces in the tripping position. can be switched. Although it has been found that this type of locking mechanism generally works well in its various embodiments, it is difficult to meet the particular requirements that may arise, especially in switchgears of compact construction. In other words, in order to increase the opening/closing ability of a switch with a compact structure, it is necessary to increase the opening speed and opening angle when opening, and it is also desirable that the opening/closing lock mechanism respond quickly to a trip command. However, these requirements cannot be fully met with conventional toggle link mechanisms.

Therefore, an object of the present invention is to configure the opening/closing lock mechanism of this type of electric switch so that the opening angle and opening speed can be increased with a small latching force in order to improve the opening/closing ability.

According to the present invention, the holder of the movable contact is configured as an angle lever consisting of one and the other lever arms extending in two directions intersecting with its support axis (opening/closing axis); One lever arm supports a movable contact, and the other lever arm is swingably connected to an opening/closing link, which is swingably supported on a fixed fulcrum via a swinging arm. Like the double-arm lever, the electric lever is connected so as to be swingable, and one lever arm of the double-arm lever is used as a latch lever, and the other lever arm also functions as a manual operation mechanism. This is accomplished by a switch.

In this case, the holder of the movable contact, together with the opening/closing link and the rocker arm, forms a four-lever system which can snap into place if the length of the lever and the initial angular position during opening are selected appropriately. This allows rapid opening movement at large angles.

In order to achieve the desired movement, the opening/closing link is arranged so that in the closed position it extends substantially parallel to the direction of extension of the lever arm of the holder supporting the movable contact;
It is also advantageous for the rocker arm to be oriented at an obtuse angle with the extension of the opening/closing link in a direction opposite to the boulder. This results in the desired movement and a lever arrangement suitable for compact switch construction. That is, the extension of the toggle link mechanism perpendicular to the plane of the current path of the switch determines the height of the switch case, but since many parts of the opening/closing lock mechanism according to the present invention extend parallel to the plane of the current path, The height of the switch case can be lowered.

As mentioned above, conventional switches of compact structure have an operation handle supported so as to be swingable around a center of rotation. In contrast, according to one embodiment of the invention, the single rotation center point is omitted and a linearly movably guided manual operating mechanism is provided. This manual operating mechanism has an active surface that abuts the nose of one of the lever arms of the double-armed lever, and can be moved into a retracted position by this lever arm. The omission of a center of rotation simplifies the construction, and at the same time the linear movement is favorable for cooperation with hand-cranked or electric drives.

An additional tripping four-cooking mechanism may be provided independently of the double-arm lever. For this purpose, it is advantageous if the rocking arm support is movably guided and can be released by means of a tripping device. Thereby, the delay in closing can be made particularly small.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

The low-voltage power switch 1 according to FIGS. 1 and 2 has a case 2 on the front side of which a connection device 3 for the power supply and load-side connection lines is arranged. An operating handle 5 protrudes through a hole in the upper part of the case, and this handle is marked with a double-headed arrow 6.
It is guided so that it can move in a straight line in the direction of. The current path of the switch 1 starts from the connecting device 3 and passes through the thermal separate disconnecting device 11
The heater wire 7 for the bimetal 10 is included. The electromagnetic yoke 12 of the electromagnetic draw device 13 is connected to the heater wire 7.
A flexible conductor 14 for connecting to the movable contact 15 follows, and a fixed contact 16 faces the movable contact 15. The fixed contact 16 is connected to another external line connecting device 4.

The movable contact 15 is swingably supported by a holder 20 in place of the support bin 17, and is under the action of a contact force spring 210 applied between the inner end of the movable contact 15 and the fulcrum 22 of the holder 20. It is in. The holder 20 is attached to an opening/closing shaft 23, and is configured as an angle lever consisting of one lever arm and the other lever arm extending in two directions substantially perpendicular to the axis of the holder 20. One lever arm swingably supports the movable contact 15 via a bearing 24 and a support bin 17, and the other lever arm swingably connects to an opening/closing link 26 via another support bin 25. has been done. The opening/closing link 26 is swingably connected to a swinging arm 28 via a knuckle bin 27, and the swinging arm 28 is supported swingably except for a fixed fulcrum 30. The opening/closing link 26 is swingably connected to the double-arm lever 31 via the knuckle bin 27. One lever arm 32 of the double-armed lever 31 is used as a latch lever, and the other lever arm 33 is in contact with the inner working surface 34 of the manual operating mechanism 5. The latch lever 32 is supported by a hook portion of a tripping lever 35. The tripping lever 359 is pivotable about a bearing 37 by means of an anchor lever 36 which cooperates with the bimetal 10 on the one hand and with the electromagnetic yoke 12 on the other hand. In the illustrated closed position, the double-armed lever 31 on the one hand has its latching lever 3
2 on the hook of the tripping lever 35 and, on the other hand, on the active surface 34 of the manual operating mechanism 5 by the lever arm 33.

In this closed position, the contact force spring 21 applies the necessary contact force between the movable contact 15 and the fixed contact 16. Furthermore, the force of the opening spring 40 disposed between the holder 20 and the fixed fulcrum 41 is acting. Opening spring 4
0 is a holder 20, which is hung on a support 22 as shown in FIG.

If an overcurrent or short-circuit current flows through the current path of the power switch 1, the separate thermal disconnect device 11 and the electromagnetic trip device 3 are activated. In either case, the trip lever 35 is swung clockwise, and the latch lever 35 is swung clockwise.
Separated from 2. As a result, the opening/closing link 26 loses its fulcrum. Then, the relative positions of each part are as shown in FIG.

At this time, as the opening/closing link 26 shifts and swings, the holder 20 swings counterclockwise due to the action of the opening spring 40 to separate the movable contact 15 from the fixed contact 16. that time,
It will be appreciated that the angular relationship of the levers to each other changes.

In other words, in the closed position, the swinging arm 28 and the opening/closing link 26 are slightly out of alignment with each other, while the opening/closing link 26 and the lever arm between the opening/closing shaft 23° of the holder 20 and the support bin 25 are not aligned with each other. Although nearly perpendicular, their angular relationship is reversed in the open position. That is,
In the open position, the opening/closing link 26 and the lever arm of the holder 20 extend substantially in line with each other.

The movement history of the holder 20 is almost the same as above.

This also occurs when the latch lever 32 is operated while being engaged with the hook portion 18 of the tripping lever 35 and the handle 5 is moved in the direction of the arrow 6. Namely.

The lever arm 33 of the double-arm lever 31 loses its fulcrum.

As a result, the opening/closing link 26 reaches the open position shown in FIG. 4 with the same displacement and rocking noise.

When automatically opening the pole by swinging the trip lever 12.

The double-armed lever 31 is moved in the direction of the arrow 6, and in the process moves the operating handle 5 with it by means of its nose 42, which is in close contact with the working surface 34. This indicates that the operating knob occupies the position if '5 between the closed and open positions and is in the tripped condition. In order to enable the switch to open and close (1), the operating handle 5 is moved beyond the open position in the direction of the arrow 6, and the return spring 43 prevents the rattle lever 32 from being pulled again and engages with the hook portion 18 of the lever. It is necessary to move it to #.

The switch described here is of multi-pole, in particular three-pole construction as shown in FIG. The opening/closing lock mechanism shown in FIG. 1 is associated with the central current path of the three pole current paths of the switch.

The transmission of force to the current paths on both sides takes place by means of an opening and closing shaft 23 that interconnects all three holders 20. In a known manner, the gap left next to the opening/closing locking mechanism is, for example, an operating current trip device.

It can be used to provide additional devices such as undervoltage trip devices and alarm and indicator switches. Furthermore, an arc extinguishing chamber (45 in FIGS. 1 and 4) may be associated with the contact in a known manner. Since a loop-shaped current path is used between the movable contact 15 and the fixed contact 16 to accelerate the opening movement during opening, an impact force is exerted on the movable contact 15 at a sufficiently large current.

5 and 6 show another embodiment of the opening/closing lock mechanism. The structure of this opening/closing lock mechanism is also the same in principle as the structure of the opening/closing lock mechanism described above. A current path is formed by the first connection device 50, the flexible conductor 51°, the movable contact 52, the fixed contact 53, and the second connection device 54. The holder 55 of the movable contact 52 is likewise constructed as an angle lever, the first lever arm of which is connected to the fulcrum 56 of the holder 55 and the support pin 5 of the movable contact 52.
7, and the second lever arm extends perpendicularly to the first lever arm between the fulcrum 56 and the support pin 58 of the opening/closing link 60.

13- Further, as in the previous embodiment, a swinging arm 61 is provided which is connected to the opening/closing link 60 by a knuckle bin 62 and connected to a fulcrum 81 by a knuckle bin 63.

The swinging arm 61 and the opening/closing link 60 form an obtuse angle in the closed position (FIG. 5).

The difference from the embodiment shown in FIGS. 1 to 4 is as follows.
The opening/closing link 60 extends beyond the knuckle bin 62 and is connected to a double-arm lever 66 by a knuckle bin 65 at its end. One lever arm 67 of this double-arm lever
may be used in conjunction with a manual operating mechanism or by itself as a manual operating mechanism. The other lever arm 71 of the double-armed lever 66 is used as a latch lever and engages with a pin 72 located at its end in a slit 73 of a tripping lever 74 which is swingable about a fulcrum 75. Double arm lever 6
6 to the extended end of the opening/closing link 60, the switch is moved when the pivot points 56. Reclosing is also possible when the lever arm between the knuckle bins 58 and the opening/closing link 60 extend in a straight line.

The trip lever 74 was connected to the connecting device 50. It cooperates with an electromagnetic yoke 76 through which a conductor 78 is passed. In the closed position shown in FIG.
The lever arm 67 is held by the above-mentioned operating knob which completely prevents the lever arm 67 from swinging in the counterclockwise direction. When the operating handle is moved to the left, the opening spring 77 becomes effective and swings the holder 55 into the open position shown in FIG. At this time, the angular relationship of the levers changes so that the opening/closing link 60 and the lever arm between the fulcrums 56 and 57 of the holder 55 form an obtuse angle. Since the slit 73 of the trip lever 74 acts as a support for the pin of the latch lever 71, the double-arm lever 67 is swung clockwise.

The automatic disengagement by swinging the launch 74 in the counterclockwise direction also leads to isolation of the iJ movable contact 52 from the fixed contact 53, while the lever arm 67 maintains contact with the operating handle 70. In addition, the opening/closing link 60 and the double-arm lever 6
6 is moved to the position shown in FIG.

As with the embodiments of FIGS. 1-4, the tripping movement of the latch 74 is achieved by means of an electromagnetic tripping device which is one-pull or by a thermal separate tripping device (to simplify the drawings) in a known manner. (not shown) may also be used. Thermal disconnect devices operate by the heating effect of the current flowing through the current path of the switch.

Another tripping device is an electromagnetic quick tripping device that includes a slot guide 80 for the fulcrum 64 and an anchor 81 that supports the fulcrum 64 in a normal state. When the anchor 81 is attracted by the electromagnetic yoke 82, the fulcrum 64
is displaced within the elongated hole guide portion 80. The displacement of the connection point is thereby linked to the result of the isolation of the contact.

The extension of the opening/closing link 60 beyond the knuckle pin 62 thickens the conversion ratio so that for the same contact force, less force is produced on both the operating knob 70 and the trip lever 74. This conversion ratio is related on the one hand to the spacing between the articulation points 62 and 65 if the spacing between the articulation points 57 and 62 is the same, and on the other hand to the length of the double-armed lever 66 and to the length of the double-armed lever 66. It concerns the position of the connection point 65 relative to the end.

[Brief explanation of the drawing]

Figure 1 is a side view showing a low-voltage power switch with a compact structure, Figure 2 is a cross section taken along the line ■-■ in Figure 1, showing the three-pole structure of the switch, and Figures 3 and 4 are Figure 5 showing the opening/closing locking mechanism in the tripped position and open position, respectively.
6 and 6 are views showing another embodiment of the opening/closing locking mechanism in the closed position and the open position, respectively. 1...Low voltage power switch, 2...Case, 3.4...
・Connection device, 5... Operation as manual operation mechanism... Handle, 6... Direction of movement of operating handle, 7... Heater wire, 10... Bimetal, 11... Thermal separate disconnection Device. 12... Electromagnetic yoke, 13... Electromagnetic trip device, 14... Flexible conductor, 15... Movable contact, 16
...Fixed contact, 17...Support pin %20...Holder, 21...Contact force spring, 23...Opening/closing shaft, 24
... @j receiver, 2517- ... Support pin, 26 ... Opening/closing link, 27 ... Knuckle pin, 28 ... Swinging arm, 30 ... Fixed fulcrum,
31...Double-arm lever, 32...Ratsutele Heart Shiteleha arm, 33...Lever arm operable by manual operation mechanism, 34...Action surface, 35...Retractable lever, 37 ...bearing, 40...opening spring, 41...fulcrum, 42...nose, 45...arc extinguishing chamber, 61...swinging arm, 64...support, 81°82 ... Draw-out mechanism, 80... Long hole guide section. 18-

Claims (1)

[Scope of Claims] E) at least one stationary contact, a movable contact mounted on a swingably supported holder, a lever actuable by a manual operating mechanism, and a lever releasable by a tripping mechanism. In an electric switch having an opening/closing lock mechanism including a latch lever, the holder of the movable contact is configured as an angle lever consisting of one lever arm and the other lever arm extending in two directions intersecting with the support axis (opening/closing axis) of the holder of the movable contact. The one lever arm supports a movable contact, and the other lever arm is swingably connected to an opening/closing link, and this opening/closing link swings to a fixed fulcrum via the swinging arm. The two-armed lever is supported in the same way as the two-armed lever and is pivotably connected to the two-armed lever, one lever arm of which is used as a latching lever and the other lever arm jointly acting as a manual operating mechanism. In the electrical switch O 2 characterized by:
In the closed position, the opening/closing link is arranged so as to extend approximately parallel to the extending direction of the lever arm of the holder supporting the movable contact, and the swinging arm forms an obtuse angle with the opening/closing link. An electric switch characterized by: 3) In the electric switch according to claim 1, 1
characterized in that the manual rimming mechanism is linearly movable and can be moved into a trip position between a closed position and an open position by being carried by the nose of one lever arm of the double-armed lever; Electric switch. 4) In the electric switch according to claim 1,
An electric switch characterized in that a swinging arm support is movably guided and can be released by a tripping mechanism.