KR100880775B1 - Circuit breaker - Google Patents

Abstract

An object of the present invention is to close the gap between the operation handle and the window frame opened in the cover without interference with other functional parts mounted on the main body case so as to effectively prevent dust from entering.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention mounts the functional part of the circuit breaker containing an operation handle in the main body case which consists of a case and a cover, and the said operation handle 7 is in the top part of the oscillating handle lever 8; In the circuit breaker in which the handle portion is raised in the center of the upper surface of the coupled flange-shaped base (7a) and protrudes outward through the handle window frame opened in the cover of the main body case, the operation handle (7) A closing means for preventing a gap between the base 7a of the handle and the handle window frame (window frame 2B-1 opened in the rear cover 2B), which is loosely fitted to the handle portion of the handle to form a seat-shaped handle shutter on the upper surface of the base. (10) are laid down, and the front and rear ends of the front and rear edges of the base positioned at the window frame of the cover with the handle shutter 10 respectively at the ON and OFF positions of the operation handle 7. And it extends rearward so as to close the gap from the edge.

Description

Circuit breaker {CIRCUIT BREAKER}

1 is an exploded perspective view of a main body case of a circuit breaker and a handle shutter mounted to the case according to an embodiment of the present invention.

FIG. 2 is an exploded view of the main body case of FIG. 1 viewed from the side. FIG.

3 is an external perspective view of a circuit breaker assembled by mounting a functional part on the main body case of FIG.

Fig. 4 is a cross-sectional view of the handle periphery showing the shutter operation position when the operation handle is moved to the ON and OFF positions in the breaker with the handle shutter shown in Fig. 3, wherein (a) and (b) are the handles, respectively. Figures corresponding to ON and OFF positions.

FIG. 5 is an enlarged cross-sectional view of the portion P in FIG. 4A.

FIG. 6 is an enlarged cross-sectional view of the portion P in FIG. 4B.

7 is a plan view of a handle shutter and a peripheral portion thereof corresponding to FIG. 4B.

8 is an enlarged cross-sectional view of the main part of FIG. 7 as viewed from the side.

9 is an exploded perspective view showing the assembly structure of a conventional circuit breaker.

It is sectional drawing which looked at the cover and operation handle of the main body case of FIG.

* Description of the symbols for the main parts of the drawings *

1: case 2: middle cover

2A: front cover 2A-1: recess

2B: rear cover 2B-1: handle window frame

2B-2: Shutter presser 3: Top cover

7: operation handle 7a: flange-shaped base

8: handle lever 10: handle shutter

10a: loose-fit hole 10b: coupling tab

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for a circuit breaker, an earth leakage breaker, and the like, and more particularly, to a handle shutter structure that prevents dust from entering through a handle window frame opened in the main body case.

First, the overall structure of the circuit breaker and the conventional structure of the periphery of the operation handle thereof are shown in Figs. 9 and 10, respectively, for the earth leakage breaker described above. In FIG. 9, 1 is a lower case constituting a main body case (molded resin case), 2 is an intermediate cover, 3 is an upper cover, and the case 1 is a current blocking unit including a main circuit conductor 4 and a contact mechanism. Various parts, such as the part 5, the opening-closing mechanism 6, the operation handle 7, and the video current transformer 9, are assembled. Here, as shown in FIG. 10, the operation handle 7 is a resin molded article having a shape in which a handle portion stands up from the center of a flange-shaped base 7a having an arcuate cross section, and swings the base 7a. A handle which engages with the top of the pull handle lever 8 and protrudes outward through the handle window frame (window frame 3a of the upper cover) opened in the opening of the intermediate cover 2 and the upper cover 3; The handle part of (7) is made to be operated to ON and OFF positions manually (for example, refer patent document 1).

In addition, although the type is slightly different from the operation handle 7 described above, a wing-shaped elastic shield member extending from the base of the handle handle in the front-rear direction (the moving direction of the handle) is provided, and the shield member is covered by the cover of the main body case. The structure which presses on the circumferential edge of the handle window frame opened to the inside, and prevents invasion of dust from the outside is also known (for example, refer patent document 2).

[Patent Document 1] Japanese Patent Application Laid-open No. H8-255548 (FIGS. 1 and 2)

[Patent Document 2] Japanese Patent Laid-Open No. S62-170123 (Figs. 1 to 10)

By the way, in the circuit breaker shown in Figs. 9 and 10, in order to prevent dust from entering the interior of the main body case through the handle window frame opened in the covers 2 and 3 of the main body case, the window frame is turned on. On the other hand, the length of the front and rear directions of the flange-shaped base 7a of the operation handle is increased while suppressing it to the minimum size necessary for stroke operation between and OFF. Consideration should be given so that a gap does not occur between the window frame and the cover even when the cover is moved to one position.

By the way, the functional parts are assembled side by side at a high density side by side without leaving almost unnecessary clearance inside the main body case of the circuit breaker, and when the base 7a of the operation handle 7 is enlarged, There is a danger of interfering with other functional parts in position. In particular, an arc extinguish chamber is provided in the current interrupting part 5 shown in FIG. 9, and an arc gas generated in the middle cover 2 is formed along with the blocking of current. gas) does not blow into the window frame. For this reason, the base 7a of the operation handle 7 has a structural design restriction such that the opposite side to the current interrupting portion is short and small, and it is difficult to completely prevent the gap between the cover and the window frame. Do.

Further, as disclosed in Patent Literature 2, a wing-shaped shielding member (flexible elastic material) extending in the front-rear direction is provided at the base of the handle of the operation handle, and the shielding member is attached to the circumferential edge of the window frame of the cover. According to the structure which was pressed and covered, invasion of dust can be prevented effectively. However, when a tool (driver or the like) is inserted into the cover opening of the main body case from the outside, the shielding member is simply deformed inward to create a gap between the operation handle and the tip of the tool is in contact with the charging part inside the case. There is a risk of electric shock, there is a problem that can not ensure the safety of the circuit breaker.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to solve the above problems, to suppress interference with other functional parts mounted on a main body case of a circuit breaker, and to ensure sufficient safety while operating handles and covers. It is to provide a circuit breaker having a shutter means of the handle that can effectively prevent the intrusion of dust from the outside by closing the gap between the window frame opened in the.

In order to achieve the above object, according to the present invention,

A breaker functional part including an operation handle is mounted on a main body case formed of a case and a cover, and the operation handle has a shape in which a handle portion stands in the center of an upper surface of a flange-shaped base coupled to a top of a swing handle lever. A circuit breaker which protrudes outward through a handle window frame opened in the cover,

As a closing means for preventing a gap between the base of the operation handle and the handle window frame, the handle shutter is loosely fitted to the handle portion of the handle to install a seat-shaped handle shutter on the upper surface of the base, and the handle shutter is turned on and off of the operation handle. Are respectively set so as to extend rearward from the front and rear end edges of the base located in the handle window frame to close the gap between the handle window frame and the handle (claim 1). It consists of an aspect as described.

(1) One end of the handle shutter is extended in the longitudinal direction, and then the extension part is guided and supported along the upper surface of the cover of the main body case (claim 2).

(2) In the above (1), the cover of the main body case is composed of an intermediate cover divided into a front cover and a rear cover, and an upper cover covering the upper surface of the intermediate cover, wherein the extension of the handle shutter is formed by It is inserted and guided between the recess formed on the upper surface of the one side cover and the shutter pressing piece of the sunshade formed on the other side cover to face the recess (claim 3).

(3) In the configuration of (2), a coupling tab is formed at the side edge of the extension portion of the handle shutter, and a stopper portion for restricting the moving range of the shutter is provided on the intermediate cover opposite to the coupling tab (claim 4). .

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring an Example shown in FIGS. 1 to 8 illustrating an embodiment, the same reference numerals are used for members corresponding to FIGS. 9 and 10, and description thereof is omitted.

First, an exploded view of a main body case of a circuit breaker according to an embodiment of the present invention is shown in Figs. 1 and 2, and Fig. 3 is a perspective view of the assembled state of the circuit breaker.

In the main body case of the embodiment shown in Figs. 1 to 3, the intermediate cover forms a divided structure in which the front cover 2A and the rear cover 2B are combined, and the window frame 2B- opened on the upper surface of the rear cover 2B. As for the operation handle 7 which protrudes to 1), the sheet-shaped handle shutter 10 which was loosely fitted to the handle part of the operation handle 7 and laid on the upper surface side of the handle base as described later is further provided. have.

Here, the handle shutter 10 is, for example, a flexible plastic sheet, and at the center of the sheet surface is a handle clearance of an angled shape having the same width as that of the handle of the operation handle 7 and having a length in the front-back direction longer than the handle. The engagement hole 10a is opened, and one end side (the ON position side of the operation handle) of the shutter is extended, and the engagement tab 10b protrudes from the left and right edges of the tip. Then, the handle shutter 10 inserts the clearance engaging hole 10a into the handle portion of the operation handle 7, and then the extension portion has a flat shape recess formed on the upper surface of the front cover 2A of the intermediate cover. It is sandwiched between 2A-1 and the shutter pressing piece 2B-2, which is mounted in a sunshade shape from the front edge of the rear cover 2B to face the concave portion, and is guided to be slidably supported.

Next, in the circuit breaker in which the handle shutter 10 is loosely laid on the operation handle 7 and installed, the operation states in which the operation handle 7 is moved to the ON and OFF positions are shown in FIGS. 4A and 4B, respectively. ) And enlarged cross-sectional views of the portion P of FIGS. 4A and 4B are shown in FIGS. 5 and 6, respectively.

That is, in the states of FIGS. 4A and 5 in which the operation handle 7 is moved to the ON position (left side in the drawing), the flange-shaped base 7a of the flange 7 is loosely fitted to the handle portion of the operation handle 7. The handle shutter 10 installed on the upper surface side has its front end (right end of the drawing) further extending rearward from the end edge of the base 7a, and the rear cover of the handle base 7a and the intermediate cover at this position. The handle shutter 10 closes the gap g between the handle window frame 2B-1 opened in 2B (see Fig. 5) to prevent intrusion of dust from the outside. In addition, the extension portion extending to the left end side of the handle shutter 10 is a gap between the recessed portion 2A-1 formed on the upper surface of the front cover 2A and the shutter pressing piece 2B-2 of the rear cover 2B. Housed in space.

Here, in order to turn off the circuit breaker, if the handle part of the operation handle 7 is moved from the ON position of FIG. 4 (a) toward the OFF position shown in FIG. 4 (b), a handle shutter will be started at the beginning of a movement. The handle is moved only while the handle 10 stays at the position of FIG. 4 (a). When the handle part contacts the right end of the handle clearance engaging hole 10a of the handle shutter 10 during the movement, the handle is interlocked with the handle. The shutter 10 also starts to move in the right direction. And in the terminal position of the operation handle 7, as shown in FIG.4 (b) and FIG.6, the extension part of the handle shutter 10 is the said recessed part 2A-1 and the shutter pressing piece 2B-2. The inner side of the handle window frame 2B-1 opened in the middle cover with its end left in the gap between them is pulled out to close the gap g between the handle base 7a and the window frame at that position (see FIG. 6). do.

As can be seen from the above operation description, in the ON and OFF positions of the operation handle 7, a gap between the window frame 2B-1 of the intermediate cover and the end edge of the operation handle 7 located inside thereof is It is closed by the handle shutter 10 further extending from the rear end edge of the handle base 7a to the rear side thereof, whereby dust can be reliably prevented from invading the inside of the device from the outside. In addition, the movement range of the handle shutter 10 loosely inserted in the handle portion of the operation handle 7 is shorter than the movement stroke of the operation handle 7, and the handle shutter ( Since the front end (right side of the drawing) of 10) does not protrude forward than the end edge of the handle base 7a, there is no fear of improperly interfering with other functional parts mounted inside the main body case.

In addition, in the state of FIG. 4 (b) in which the operation handle 7 is moved to the OFF position, the extension side end of the handle shutter 10 is the front cover as shown in the plan view of FIG. 7 and the enlarged cross-sectional view of FIG. It stays in the position sandwiched between the recessed part 2A-1 of (2A) and the shutter pressing piece 2B-2 of the sunshade formed in the back cover 2B. The stopper portion 2B-3 protrudes from the rear cover 2B to face the engaging tab 10b formed at the tip of the extension portion.

Accordingly, even if a tool such as a driver is to be inserted into the handle window frame 2B-1 from the OFF position of the operation handle 7 to the outside of the main body case, it cannot be inserted into the case by being blocked by the handle shutter 10. In addition, even if the tool is forcibly pushed in, the engaging tab 10b of the handle shutter 10 is restrained by the stopper portion 2B-3 of the intermediate cover, so that the shutter does not come out, thereby ensuring safety. In addition, in FIG. 8, when the terminal side step part 2A-2 of the recessed part 2A-1 formed in the upper surface of 2 A of front covers moved the operation handle 7 to the ON position, It functions as a stopper part for regulating the moving range of the steering wheel shutter 10 in association with the steering wheel.

According to the above configuration, the seat-shaped handle shutter extending forward and rearward from the end edge of the flange-shaped base at the ON and OFF positions of the operation handle respectively closes the gap between the handle and the handle window frame of the main body case. The intrusion of dust can be prevented reliably. Also, in this case, the handle shutter is loosely fitted to the handle portion of the operation handle through the longitudinally long angled opening opened in the seat surface, so that the handle shutter moves in the forward and backward directions in conjunction with the ON and OFF operation of the operation handle. The movement range of X is smaller than the movement stroke between ON and OFF of the operation handle, thereby making it possible to artfully avoid interference between the handle shutter and other functional parts assembled inside the breaker.

Further, one end of the handle shutter is extended in the longitudinal direction, and then between the top recess of the front cover of the divided intermediate cover and the shutter pressing piece of the rear cover so that the extension does not interfere with other functional parts. Loosely inserted and guided, the moving range of the handle shutter was regulated by a stopper provided on the cover side within a range not impairing the shutter function. Accordingly, even if a tool or the like is inserted into the window frame of the cover from the outside, safety can be secured by preventing the handle shutter from being inserted into the inside of the device.

In addition, the structure of the operation handle does not need to be changed, and it is not necessary to add a low-cost seat-shaped handle shutter to it, which does not cause a significant increase in cost.

Claims (4)

A breaker functional part including an operating handle is mounted on a main body case formed of a case and a cover, and the flange has a flange shape coupled to the top of the swing handle lever. A circuit breaker having a shape in which a handle portion stands in the center of an upper surface of a base and protrudes outwardly through a handle window frame opened in the cover. As a closing means for preventing a gap between the base of the operation handle and the handle window frame, the handle shutter is loosely fitted to the handle portion of the handle and a sheet-shaped handle shutter is installed on the upper surface of the base. In the ON and OFF positions of the steering wheel, a gap between the handle window frame and the handle window frame of the handle extends in one direction from the one end edge and the other end edge of the base on the base positioned in the handle window frame, in the opposite direction to the direction. Circuit breaker, characterized in that set to close. The method of claim 1, And one end of the handle shutter is extended in the longitudinal direction, and then the extension part is guided along the upper surface of the cover of the main body case. The method of claim 2, The cover of the main body case is composed of a middle cover divided into a front cover and a rear cover, and a top cover covering the upper surface of the middle cover, and the extension of the handle shutter is divided into one side of the middle cover. A circuit breaker characterized in that it is inserted and guided between a recess formed on the upper surface of the cover and a sunshade-shaped shutter pressing piece formed on the other divided cover facing the recess. The method of claim 3, wherein And a stopper portion formed at a side edge of the extension portion of the handle shutter, and a stopper portion for restricting a moving range of the shutter on the intermediate cover opposite the engagement tab.

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