JP2838940B2 - Circuit breaker for wiring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for wiring,
In particular, the opening and closing mechanism is fixed at a predetermined position on the main body base.

[0002]

2. Description of the Related Art FIG. 5 is a side view of a conventional circuit breaker shown in, for example, Japanese Utility Model Laid-Open Publication No. 1-140746. In the figure, reference numeral 1 denotes an outer shell, which is composed of a molded product base 1a and a cover 1b. Reference numeral 2 denotes a stator having a contact 2a at the tip. Reference numeral 3 denotes a mover having a contact 3a at one end and the other fixed to a crossbar 4. Reference numeral 5 denotes a substantially U-shaped frame which supports the opening / closing mechanism and is fixed to the base 1a by screws 6.
Reference numeral 7 denotes an upside down type, which is supported by a handle arm 8. One end of the handle arm 8 is rotatably locked to the projection of the frame 5. Reference numeral 9 denotes a pair of links, which constitute a toggle link mechanism of an opening / closing mechanism, and a lower end of which is a movable element 3.
And the upper end thereof is engaged with the lever 10. A biasing spring (not shown) is hung on the intermediate portion 11 of the pair of links 9. One end of the lever 10 is rotatably held on the frame 5 by a stopper pin 12, and the other end is locked by a trip device 13. The stopper pin 12 penetrates the vertical parallel plate portion 5a of the frame 5. Cross bar 4 is mover 3
In the case of a multipole circuit breaker, the mover 3 of each pole is interlocked and held.

Next, the operation will be described. In order to change the circuit breaker from the closed state shown in FIG. 5 to the open state, it is sufficient to move 7 in the direction of arrow 14, whereby the force of the urging spring (not shown) causes the link 9 to move up and down. The engagement point 11 is bent and the mover 3 is pulled up in the direction of the arrow 15,
It is well known that an open state occurs.

[0004]

Since the conventional circuit breaker is constructed as described above, during the opening operation, the lifted movable element 3 collides with the stopper pin 12 and stops moving. Can be The inertial force of the mover 3 at this time is transmitted as an impact to the stopper pin 12 and then to the frame 5 holding the opening and closing mechanism. As described above, the frame 5 is fixed by screws 6 from the back of the base 1a via the base 1a. However, the impact force of the mover 3 above the fixed end causes the frame 5 to vibrate without being small. The vibration of the frame 5 is also transmitted to the tip of the lever 10 that requires a fine engagement (about 0.5 mm), causing a misstrip to be disengaged from the trip device 13, There was a problem that the container was tripped.

[0005] The present invention has been made to solve the above problems, an object of the present invention to provide a circuit breaker that can be firmly fixed to the frame so that the impact from the mover does vibrate the frame.

[0006]

SUMMARY OF THE INVENTION A circuit breaker according to the present invention comprises a stator having at least one pair of contacts, a mover,
An opening / closing mechanism having a U-shaped frame;
-Shaped frame connects a pair of vertical parallel plates and these
And the outer shell is made of insulating molding material.
In a circuit breaker comprising a base and a cover ,
A pair of frame tilts converging downward on both side edges of each parallel plate
A part of the base for providing the slope and storing the frame
At a position facing the frame inclined surface.
Form a base slope with the same slope angle as the slope and
The vertical parallel plate portion of the frame is stored in the base.
At the time, first, the frame inclined surface facing the base inclined surface
The bottom part of the frame contacts the bottom of the base.
Do not touch the bottom of the frame to the bottom of the base.
Parallel plate with the frame inclined surface
Hanging in a wedge shape along the base slope of the base
With this configuration, the bottom surface of the frame is fixed to the bottom surface of the base.

[0007]

According to the present invention, when the frame is screwed and fixed to the base, the frame inclined surface and the base inclined surface engage faster than the bottom surface abuts. By further tightening the screws, the mutually inclined surfaces are press-fitted, and the frame is more firmly fixed. In addition, since it is assembled while sliding on the base wall from a state before it is completely fixed, the relative positional relationship between the frame and the base can be accurately and easily secured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Note that the description of the overall configuration and operation of the circuit breaker is the same as that of the above-described conventional example, and thus the same reference numerals are given and the description is omitted. In the figure, reference numeral 16 denotes a substantially U-shaped frame having a bottom surface 16a provided with a screw hole 17 and a pair of projections 18 for locking the handle arm 8 substantially at the center of a vertical parallel plate portion 16b. Have.
Reference numerals 19a and 19b denote frame inclined surfaces provided on both sides of the vertical parallel plate portion 16b, respectively, so that their distances gradually decrease (ie, converge) downward, and each inclination angle θ is It is about 10 ° to 15 °. 20 is a bottom surface 1 of the frame 16 formed on the base 1a.
A through hole 21 through which the screw 6 penetrates is provided substantially at the center of the bottom surface of the base to which 6a is fixed. 22a,
Reference numeral 22b denotes a base inclined surface provided on the vertical wall 101 of the base 1a, and is configured to correspond to the frame inclined surfaces 19a and 19b. Here, both inclined surfaces 19a, 19b, 2
The relationship between 2a and 22b is a parallel plate having a frame inclined surface.
Part is wedge-shaped along the inclined surface of the base
If not, the bottom surface 16a of the frame 16 is
It is configured so that it cannot contact the bottom surface 20.

Next, the incorporation of the frame 16 will be described. Now, the frame 16 is stored in the base 1a. The frame 16 is stored in the direction of the downward arrow 23, and in the process, the frame inclined surfaces 19a and 19b come into contact with the base inclined surfaces 22a and 22b. A slight gap 24 is formed between the frame bottom surface 16a and the base bottom surface 20 at that time. In this state, while the play of the frame 16 with the base 1a is absorbed, the frame 16 naturally fits in a regular position with respect to the base 1a. Further, by tightening the screw 6, the frame 16 is pulled in while slidingly press-fitting the base inclined surfaces 22a and 22b.
Then, when the bottom surface 16a of the frame 16 abuts against the base bottom surface 20 and the screw 6 is tightened with a specified torque, the assembly is completed.

[0010] As described above, the inclination angle θ is 10 °.
The reason why the angle is about 15 ° is determined by the dimension A of the press-fitting allowance and the sliding distance S. The relational expression is A = S · sin θ
Becomes That is, if the inclination angle θ is set to 15 °, the sliding distance S is set to about 0.38 in order to set the press-in allowance A to about 0.1. In addition, the screw 6
Needless to say, the screw pile strength of the screw must be large.

[0011]

As described above, according to the present invention, the frame and the base are provided with the inclined surfaces facing each other.
The effect is obtained that a circuit breaker that can be easily fixed with high relative position accuracy and can be firmly fixed can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a frame showing one embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view showing a process of storing the frame of FIG. 1 in a base.

FIG. 4 is a diagram showing a storing process further advanced from FIG. 3;

FIG. 5 is a partially cutaway side view showing a conventional circuit breaker.

FIG. 6 is a view showing a state in which the frame in FIG. 5 is stored in a base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer shell 1a Base 1b Cover 2 Stator 2a Contact 3 Mover 3a Contact 16 Frame 16a Frame bottom 16b Parallel plate 19a Frame slope 19b Frame slope 20 Base bottom 22a Base slope 22b Base slope θ Slope angle

Claims (2)

(57) [Claims] An opening / closing mechanism having a stator having at least one pair of contacts, a mover, and a substantially U-shaped frame;
The U-shaped frame has a pair of vertical parallel plates and
In a circuit breaker for wiring comprising a horizontal bottom portion connecting the base plates and having an outer shell formed of a base and a cover of an insulating molded material, a pair of frames converging downward on both side edges of the parallel plate portions.
A frame inclined surface, and the frame is provided at a position facing the frame inclined surface on a part of the base for accommodating the frame.
A base inclined surface having the same inclination angle as that of the frame inclined surface, and a vertical parallel plate portion of the frame is housed in the base.
When tilting the frame , first tilt the frame opposite the base tilt surface.
The bottom of the frame is on the bottom of the base
No contact, then touch the bottom of the frame to the bottom of the base.
To make it touch, the parallel plate part with the frame slope
The wedge is hung down along the base inclined surface of the base.
A circuit breaker for a wiring, wherein the bottom surface of the frame is fixed to the bottom surface of the base. 2. The circuit breaker for wiring according to claim 1, wherein each of the inclination angles of the base inclined surface and the frame inclined surface has the same value, and each of the inclined angles is 10 ° to 15 °.