JPS648406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a rotatable member arranged to rotate when biased by a force storage device, and a rotatable member that is rotatably supported to engage the member and prevent the rotation. The present invention relates to a latch locking device equipped with a latch lever.

This type of latch locking device is mechanically and electrically
Very widely used in mechanical technology. This device is used to release force storage devices as a function of influencing variables such as displacement, temperature, current or voltage. An example is a latch locking device in a circuit or disconnector, in which the switching mechanism is to be opened when the passing current reaches a certain value. Another example is an auxiliary trip device that may be attached to such a disconnector,
In this case, the amount of trip itself is not sufficient for unlatching the shutter or disconnector, and a force storage device is therefore required. In this device, it is important that the tripping force is kept within as small an error as possible during multiple trippings. This condition is necessary, for example, in the case of the above-mentioned shield disconnectors, which remain in place without maintenance for many years and must react quickly and precisely in the event of an abnormality.

For undervoltage tripping devices for low voltage breakers and disconnectors.
Known latch locking devices, such as those described in the General Electric publication GET-2779D, page 8 and in Ottermill MBR1001/73, consist of metal parts. In that case, many processing steps are required to produce this part, such as cutting, bending, drilling, grinding, polishing and subsequent plating. In order to reduce the costs of these various processing steps, it is also conceivable to manufacture the synergistic or interlocking parts of the latch locking device from synthetic resin by compression or injection molding. However, tests of latch locking devices made of such materials have shown that the constantness of the tripping force is insufficient. SUMMARY OF THE INVENTION It is an object of the present invention to provide a latch locking device that uses a synthetic resin member and operates with a constant tripping force and with less friction and wear.

According to the present invention, at least the region of the rotatable member that engages with the latch lever is made of thermoplastic synthetic resin, and that at least the region of the latch lever that engages with the rotatable member is made of thermosetting synthetic resin. This is achieved by means of a latch locking device which is characterized in that it forms an arcuate surface which is concentric with the support axis of the latch lever.
Studies and practical tests have shown that the combination of materials in the device described above does not result in deleterious changes in the properties of the device over multiple tripping cycles. The reason for this is believed to be that thermosetting synthetic resins, compared to thermoplastic synthetic resins, undergo only a very small deformation under the influence of the force storage device. Thermoplastic synthetic resins, on the other hand, tend to flow under pressure and are therefore easier to adapt to the rigid counterpart. What is important here is that the latch lever, which is rotatably supported, engages the rotatable member, which is arranged to rotate under the force accumulating device, to some extent at its abutting surface, so that both members are compatible with each other. That is, depending on the loading of the latch locking device by the force storage device and on the given properties of the synthetic resin, the abutment surface of the latch lever penetrates the movably arranged part to different depths. This process occurs once during assembly of the latch locking device, after which the latch locking device has constant characteristics.

In the following, the invention will be explained in more detail with reference to the embodiments shown in the drawings.

The undervoltage trip device 1 shown in FIG. 1 has one holder 2 made of plastic for all movable or otherwise active parts, which will be explained in more detail below. The holder 2 has an approximately right triangular shape in side view, from one of its triangular sides protruding approximately perpendicularly projections 8 and 9 for attaching the tripping device to the case of the cutter. An electromagnet 6 is mounted on another triangular side 3 of the holder 2 between the ribs 4 and 5, and this electromagnet connects a yoke 7 and a plunger core 10 with a return spring 11 and a guide pin 12. have The holes in the holder 2 are used to receive the mounting elements of the electromagnet 6.
The electromagnet 6 can be connected by means of a connecting line 14 to the voltage source to be monitored. The coil winding of the electromagnet 6 and the connecting wire 14 are connected at both sides 15 of the holder 2.
and 16 are arranged near the triangular side surface 19. As shown in FIG. 1, a soldering hole 17 is located in the side surface 16 of the holder 2. A hole 18 forming another soldering hole is on the opposite side 15. The holder 2 is provided with a protective plate 20,
This protective plate is the guide pin 12 of the plunger core 10.
from dust, foreign objects or other influences that may enter in the direction of arrow 21 (FIG. 1).

Third triangular side 22 from which protrusions 8 and 9 protrude
The holder 2 is of forked design in order to form supporting points in the area of both edges. In this case, the forked arms 23 and 24 with aligned holes serve to commonly support the angled lever 25 and the return lever 26 on the support pin 27, while the forked arms 28 and 30 A simultaneously aligned hole is provided on the support pin 32 which serves to support the latch lever 31 and for receiving this support pin. The latch lever 31 is made of a molded material mainly composed of thermosetting synthetic resin, such as polyester resin. In contrast, the angular lever 25 is made of thermoplastic synthetic resin.

One leg 35 of the angled lever, which is provided with support holes 33 and 34, is connected to side walls 36 and 37.
It also has a window-like hole 38 in which the return lever 26 can move. The side wall 36 has internally a support 40 for the leg of a bending spring 41 and externally, concentrically with respect to the support hole 34, another bending spring serving to connect the latch lever 31 with the plunger core 10 of the electromagnet 6. It has a cylindrical protrusion 42 as a support part for the 43 coils. Support part 40
acts as an actuating surface for introducing a restoring force into the angled lever 25, as will be explained in more detail below. The other leg 44 of the angled lever 25 extends approximately in extension of the side wall 37 of the leg 35 and forms an angle of approximately 60 DEG therewith. At its front end, the leg 44 is bent so that it can come into contact with an end face 46 of the plunger core 10. Near the point where the leg 35 of the angled lever 25 transitions into the other leg 44, a latch locking surface 47 is located which cooperates with the latch lever 31. This latch lever has an arcuate surface 48 arranged concentrically with respect to its support axis 49, this portion having a corner 50.
Furthermore, the latch lever 31 is connected to the leg 52 of the bending spring 43.
The bending spring has a cam 51 as a support part, and this bending spring surrounds the cylindrical projection 42 of the angled lever 25 with a large number of coils, and is supported by the holder 2 by the other leg 53. The bending spring 43 is the latch lever 3
1 is brought into constant contact with the end surface 46 of the plunger core 10 with its operating surface 54 and serves to connect the plunger core 10 to the end surface 46 of the plunger core 10.

The bending spring 41 includes two parts 55 and 56 with coils wound in opposite directions. Furthermore, these parts 55 and 56 have end legs 60 and 61. Portion 55 acts as a force storage device, while portion 56 forms an effective return spring upon return. Figure 9 shows the angled lever 25.
This figure shows the engaged state of the latch lever 31 and the latch locking surface 47 of the angled lever 25.
The engagement relationship between the latch lever 31 and the arcuate portion 48 of the latch lever 31 will be better understood.

In particular, in the assembled state shown in FIG. It is supported by the support part 40 of. Since the winding direction is different between the portions 55 and 56, and the number of windings is also different, on the one hand a biasing force is applied to the angular lever 25 in the direction of the stopper 62 of the projection 9 of the holder 2, and on the other hand it applies a biasing force to the return lever. The return lever 26 is moved toward the angled lever 25 so that the return lever 26 is in contact with the stopper surface.
A biasing force can be applied to the The force of the spring is such that when the return force is applied to the actuating surface 64 of the return lever 26, the angular lever 25 moves the plunger core 10 with its actuating surface 45 against its return spring 11 to the end position limited by its stopper. The return lever 26 and the angled lever 2 are pressed until the return is completed.
5 so that no relative movement occurs between the two. During this relative movement, the support 40 of the angular lever 25 acts as an operating surface for the restoring force transmitted by the bending spring 41. If the part of the breaker that acts on the operating surface 64 continues to move,
The return lever 26 is separated from the angled lever 25 with its stop surface 63 and continues to move around the common support independently of this.

Figures 1 and 2 show the undervoltage tripping device 1.
is shown in its latched operating state, in which electromagnet 6 is energized and plunger core 10 is attracted. that time,
The angled lever 25 rests with its latch locking surface 47 on the arcuate surface 48 of the latch lever 31. The angled lever 25 is then under the action of a force storage device formed by the section 55 of the bending spring 41. When the voltage to be monitored, which is now being applied to the electromagnet 6, drops to a certain value, the return spring 11 of the plunger core 10 overcomes the return force exerted on the latch lever 31 by the bending spring 43, and the latch lever 31 is activated by the angular lever 25. The latch locking surface 47 is the arcuate surface 48 of the latch lever 31.
It is rotated until it is deflected from the object. The angled lever 25 is thereby suddenly released and swung counterclockwise as viewed in FIG. The stopper 62 of the projection 9 of the holder 2 limits this rocking movement after release. During this swinging, the leg 4 of the angled lever 25
The actuating surface 65 of 4 can actuate the tripping device of the shingle breaker.

As can be easily understood, the present invention can be practiced by changing the size and shape of each part.
In particular, the length of the legs of the angled lever and the angle formed by the legs, as well as the strength of the spring and the form of the holder, are adapted to the breaker to which the undervoltage trip device is to be fitted. In this case, it may be advantageous for the holder to have a shape different from the triangular shape mentioned above.
Furthermore, instead of the plunger core electromagnet, any other electromagnet structure can be used as long as it is suitable for the undervoltage trip device. Furthermore, the cooperation between the angular lever 25 and the latch lever 31 is achieved by the fact that the directly co-acting areas of these parts, namely the latch locking surface 47 and the arcuate abutment surface 48, are made of the material according to the invention. It works just as well. This can be carried out, for example, by fitting a part made of the material according to the invention into a lever body made of another material.

[Brief explanation of drawings]

Figures 1 and 2 show an undervoltage tripping device with a force accumulating device for low-voltage breakers, which are arranged perpendicularly to each other.
Views from three directions, Figures 3, 4 and 5
The figures show the latch lever as seen from two directions and a sectional view, and Figures 6, 7 and 8 show the members movably arranged and co-acting with the latch lever as seen from two directions. and FIG. 9 is a partial cross-sectional view showing the engagement relationship between a latch lever and a member that cooperates with the latch lever. 25... Rotatable member, 31... Latch lever, 47, 48... Cooperation range, 49... Support shaft.

Claims (1)

[Claims] 1. A latch chain comprising a rotatable member arranged to rotate when biased by a force storage device, and a latch lever rotatably supported to engage the member and prevent its rotation. In the lock device, at least a region 47 of the rotatable member 25 that engages and contacts the latch lever 31 is made of thermoplastic synthetic resin, and a region 48 of the latch lever 31 that engages and contacts at least the rotatable member 25, A latch locking device comprising a rotatable latch lever made of thermosetting synthetic resin and forming an arcuate surface concentric with a support shaft 49 of a latch lever 31.