Patent Application
20080087534
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiment of the invention and together with the description serve to explain the principles of the invention.
In the drawings:
Hereinafter, description will be given in detail of the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Referring to the drawings, like numerals indicate like elements and the same reference numerals appearing in more than one drawing figures refer to the same elements.
As shown in
The switching mechanism 2 includes: a cam 22 connected to a rotational shaft 21 and rotated manually or automatically; a driving lever 24 rotatably installed at a frame 9 supporting both sides of the switching mechanism 2, and provided with a lever roller 23 so as to be rotated resulting from the lever roller 23 rotating along a curved surface of the cam 22, when the cam 22 is rotated; a closing spring 25 having one end connected to a lower end portion of the driving lever 24 and the other end supported at the frame 9 and compressed by a rotation of the driving lever 24 according to the rotation of the cam 22 so as to store an elastic energy; a first latch 27 extending longitudinally to be elastically installed at the frame 9, and having a particular recess at its lower side surface such that it is restrained when a pin 26 disposed at the cam 22 is locked by the recess; a closing switch 28 disposed at an upper side of the first latch 27 to release the restraint of the first latch 27; a first link 29 extending longitudinally, and having a lower end portion of the first link 29 connected to an upper end portion of the driving lever 24 so as to be rotated by the rotation of the driving lever 24 and a particular recess 49 at its upper side; a second latch 31 disposed at the upper side of the first link 29, and having a latch roller 30 in contact with an upper surface of the first link 29 to be rotated by the rotation of the first link 29, wherein the second latch 31 is restrained when the latch roller 30 is locked by the recess 49 of the first link 29; an opening switch 32 disposed at the upper side of the second latch 31 to release the restraint of the second latch 31; a stopper 42 disposed at a lower side of the frame 9 to prevent the rotation of the first link 29 over a certain displacement when the air circuit breaker performs a breakage (opening) operation; a second link 34 having a lower end portion connected to the driving lever 24 together with the first link 29, and disposed to come in contact with a pin 33 formed at the driving lever 24; a third link 35 connected to an upper end of the second link 34 by a connection pin 41 to be rotated according to a displacement of the second link 34; a connection shaft 36 for allowing the third link 35 to be connected to the switching shaft 3; an opening spring 37 having one end fixed to the connection shaft 36 and the other end supported at the frame 9; and a leg 40 fixed to the switching shaft 3 to move the movable contact 38 toward a terminal 39 when the switching shaft 3 is rotated.
As shown in
An insertion recess 91 for rotatably inserting the switching shaft 3 thereinto is formed at the frame 9, and a fixing hole 92 for fixing the holder 45 at the frame 9 is formed at one side of the insertion recess 91.
As shown in
The support portion 51 of the holder 45 includes an insertion portion 55 inserted into the insertion recess 91 so that an outer circumferential surface thereof can be adhered to an inner circumferential surface of the insertion recess 91; and a stopping portion 56 formed at an outer circumference of the insertion portion 55 to be contacted to the outer side surface of the frame 9.
A coupling hole 57 corresponding to the fixing hole 92 of the frame 9 is formed at the fixing portion 52 of the holder 45, accordingly, the holder 45 is fixed at the frame 9 through coupling means such as a screw, a rivet, or the like.
Accordingly, the insertion portion 55 is inserted into the insertion recess 91 of the frame 9 and the stopping portion 56 is contacted to the outer side surface of the frame 9 so as to support the insertion portion 55, under a state that the switching shaft 3 is inserted into the through hole 53 of the support portion 51 of the holder 45. Thereby, the holder 45 supports the switching shaft 3 at the insertion recess 91 of the frame 9 and serves as a bearing preventing the switching shaft 3 from having a friction with the frame 9, when the switching shaft 3 is rotated.
Meanwhile, preferably, the support portion 51 and the fixing portion 52 of the holder 45 are integrally formed as one member so as to be easy to be processed and assembled and disassembled to the frame 9.
In the meantime, as shown in
In such air circuit breaker in accordance with the present invention, as shown in
And, the elastic energy of the closing spring 25 is transferred through each link element of the switching mechanism 2, and then the switching shaft 3 connected to the third link 35 is rotated, as shown in
That is, in the process of contacting the movable contact 38 with the terminal 39 to be conducted, the elastic energy of the closing spring 25 is transferred to the third link 35, and then the third link 35 moves to the left side. Accordingly, the switching shaft 3 connected to the third link 35 through the connection shaft 36 and the holder 45 comes to be rotated, and then the movable contact 38 is moved by the leg 40 installed at the switching shaft 3 to be connected to the terminal 39.
Also, when the circuit is broken, the movable contact 38 is spaced from the terminal 39 by the elastic force of the tensioned opening spring 37, as shown in
Here, the switching shaft 3 is supported at both sides of the frame 9 through the holder 45, accordingly the load transferred to the switching shaft 3 is not concentrated to the central portion of the switching shaft 3, but distributed to both sides of the switching shaft 3, thereby preventing the central portion of the switching shaft 3 from being curved, for example.
As aforementioned, in the air circuit breaker in accordance with the present invention, the switching shaft 3 transferring the driving force generated from the switching mechanism 2 is rotatably supported at the frame 9 supporting both sides of the switching mechanism 2 by using the pair of holders 45, accordingly the load applied to the central portion of the switching shaft 3 is distributed to both sides of the switching shaft 3. Accordingly, the switching shaft 3 can be prevented from being deformed when the circuit performs the switching operation, thereby being capable of minimizing the operation deviation of the circuit. Further, the air circuit breaker can have an increased lifespan by reducing abrasion the components.
The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. The present teachings can be readily applied to other types of apparatuses. This description is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and/or alternative exemplary embodiments.
As the present inventive features may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2006-0101065 | Oct 2006 | KR | national |
