JPH06101294B2 - Fixing device for trip coil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a trip coil fixing device applied to an earth leakage breaker or the like.

[Background technology]

In the conventional trip coil fixing device, for example, a yoke of a trip coil for detecting electric leakage is fixed to a body of a breaker with a screw or is locked in a groove provided in the body.

However, in the case of screwing, there is a drawback that the number of parts increases, and in the case of groove locking, the trip coil is apt to rattle in the direction of insertion into the groove.

[Object of the Invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a trip coil fixing device which can be securely and easily fixed without rattling without increasing the number of parts.

[Disclosure of Invention]

A device for fixing a trip coil according to the present invention includes a body having a recess for mounting parts on a side portion, and a body mounted on a back wall of the recess of the body so as to project toward an opening edge of the recess and to have a tip end portion thereof. A mounting plate having a locking projection formed thereon, and a U-shaped bottom piece mounted on the mounting plate and engaging with the locking projection on the side of the bottom piece facing the opening edge of the recess. A trip coil having a yoke and a yoke having a positioning projection on the side of at least one of the both sides facing the opening edge of the recess, and attached to the body to close the opening edge of the recess. And a cover having a locking groove for positioning the positioning projection.

According to the configuration of the present invention, the bottom piece of the yoke is placed on the mounting plate, the engaging projection of the mounting plate is engaged with the engaging hole, and the positioning projection of the yoke is locked in the locking groove of the cover. Therefore, the trip coil can be securely and easily fixed without rattling without increasing the number of parts.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 6. That is, this trip coil fixing device is provided with a body 22 having a recess 40 for incorporating parts on its side and a back wall 41 of the recess 40 of the body 22 to be mounted on the recess 41.
Projecting toward the opening edge of 40 and locking projection at the tip
A mounting plate 26 having 42 formed therein and a U-shaped bottom piece 43 thereof are placed on the mounting plate 26, and the locking projection 42 is engaged with the bottom piece 43 on the side facing the opening edge of the recess 40. It is attached to the body 22 and the trip coil 2 having a yoke 34 which forms an engaging hole 44 to be fitted and further has a positioning projection piece 46 formed on at least one side of the both side pieces 45 facing the opening edge of the recess 40. Cover 7 that forms a locking groove 47 for positioning the positioning protrusion 46 while closing the opening edge of the recess 40.
It has and.

The trip coil 2 is a trip coil for an earth leakage breaker, and is configured in the earth trip portion 10 as shown in FIG.
It is combined with the circuit breaker 11 and connected by a pin (not shown). The trip coil 2 is held between both side pieces 45 of the yoke 34 and has a coil 35 wound around the outer periphery thereof.
The coil frame 18 and the plunger device 3 penetrating the both side pieces 45 of the yoke 34 are provided.
Is held between both side pieces 45 and is fixed by an adhesive or the like. The plunger device 3 is composed of a plunger 50, a return spring 21, and an operating piece 51 attached to the plunger 50 as shown in FIGS.
By the excitation of 35, the plunger 50 is attracted and the operating piece 51 projects from the coil frame 18.

The mounting plate 25 has a vertical piece 48, and is attached to the body 22 by passing a screw 31 through holes 50 in mounting tongues 49 on both sides of the vertical piece 48. The engaging hole 44 has a projecting piece 6 for forming a hole on the side of the bottom piece 43 facing the opening edge of the recess 40. By bending the projecting piece 6 upright, the engaging hole 44 opens the recess 40. It is oriented in the same direction as the edge. The cover 7 is connected by a pin connected to the circuit breaker 11 through the hole 55.

According to this embodiment, the bottom piece 43 of the yoke 34 is placed on the mounting plate 26, the engagement hole 44 is engaged with the locking projection piece 42, and the yoke
Since the positioning protrusions 46 of 34 are locked in the locking grooves 47 of the cover 7, the trip coil 2 can be fixed reliably and easily without increasing the number of parts and without rattling. That is, the assembly procedure is such that the mounting plate 26 is attached to the body 22, and the bottom piece 43 of the yoke 34 holding the coil frame 18 is placed on the mounting plate 26 while engaging the engagement hole 44 with the locking projection 42. The cover 7 is attached to the body 22, and the engagement groove 47 is engaged with the positioning protrusion 46. Therefore, the conventional screw is not required to fix the trip coil 2, and the locking projection 42 and the positioning projection 46 lock the trip coil 2 to the mounting plate 26 and the cover 7, so that the direction of the opening edge of the recess 40 is the same. The movement of the lock projection 42
It is regulated by locking the front end of the mounting plate 26, which is the root side of the, and by contacting the front end of the positioning protrusion 46 with the bottom of the engagement groove 47, and the vertical movement with respect to the recess 40. The bottom piece 43 is placed on the mounting plate 26, and the engagement hole 44 is locked by the locking projection 42. It is regulated by being supported by the locking piece 42 and the engaging groove 47 at two points.

This embodiment will be further described. The trip coil 2
Is operated by the output of the current leakage detector 1 which is a current transformer, and the output of the current leakage detector 1 is the circuit unit 15 (FIG. 3).
It is amplified and processed by the trip coil 2 at the output end of the circuit section 15.
The coil 35 of is connected. The leakage detection unit 1 draws in the power line 56 of the circuit breaker 11.

The tripping mechanism that trips due to the operation of the trip coil 2 is a tripping mechanism that trips a trip link (not shown) of the circuit breaker 11. The arm 39 is attached to the end of the interlocking member 4 for trip-linking a plurality of poles of the circuit breaker 11. And the arm 39 is opposed to the tip of the operating piece 51. The circuit breaker 11 is of a remote control type, and is configured to actuate a bistable type polar electromagnet by an external signal to operate the handle 8 and hold each of the ON and OFF states of the contact portion. There is. Therefore, when the trip coil 2 operates, the plunger 50 operates against the return spring 21 and the operating piece
The arm 39 is pushed by 51, the interlocking member 4 is rotated, and the trip link of each pole of the circuit breaker 11 is tripped by the rotation of the interlocking member 4 to operate to release the latch link of the circuit breaker 11. By releasing the latch link, the contact portion is tripped and opened by a known operation.

The trip coil 2 has an earth leakage display portion 5, and the earth leakage display portion 5 is slidably provided in a guide 19 provided on the coil frame 18 at a right angle to the operation direction of the operating piece 51.
Is urged in the direction of protruding from the body 22. The leakage display unit 5 has a through hole 16 penetrating the operating piece 51, and has a return spring 20.
The tip of the stopper 17 formed on the actuating piece 51 is positioned in the through hole 16 in a state of being biased. The trip coil 2 operates so that the stopper 17 separates from the through hole 16 when the operating piece 51 operates, so that the earth leakage display section 5 is restored by the return spring 20, and the earth leakage display button 5a projects from the body 22. The leakage is displayed. Moreover, the leakage indicator 5 is provided on the side of the stopper 17.
Since the edge of the through hole 16 is locked, the operation piece 51 is prevented from returning.

In order to reset the earth leakage display portion 5 and the plunger device 3, a handle shaft 38 that interlocks with the handle 8 that opens and closes the contact portion of the circuit breaker 11 is provided, and an engaging recess 29 that engages with the tip of the handle shaft 38 is formed. The middle part of the interlocking lever 12 is the shaft 28
The reset lever 13 is fixed to the vertical piece 48 by means of a shaft 25 at the base end of the reset lever 13 facing the tip of the interlocking lever 12, and the projection 24 is provided at the tip of the reset lever 13.
An inclined surface 27 is formed facing the. The protrusion 24 engages with the engagement notch 23 of the leakage display unit 5. Therefore, when the stopper 17 of the leakage indicator 5 is located in the through hole 16, the protrusion 24 causes the inclined surface 27 of the reset lever 13 to move.
When the electric field is returned to the interlocking lever 12, the electric leakage indicator 5 returns to the interlocking lever 12, and the inclined surface 27 approaches the interlocking lever 12. Circuit breaker
Even if 11 is tripped, the handle 8 is kept in the ON state by the bistable type polar electromagnet, and the reset after the trip moves the knob 8a of the handle 8 or drives the bistable type polar electromagnet to move the handle 8 In the state in which the handle 8 is tilted to the off side, the handle shaft 38 moves and the interlocking lever 12 rotates as the handle 8 moves from the on state to the off state. When the trip coil 2 does not detect an electric leakage, the reset lever 13 does not operate because the inclined surface 27 of the reset lever 13 is separated from the interlocking lever 12, but when the trip coil 2 operates, the inclined surface 27 interlocks. Since the lever 12 is approached, the reset lever 13 is rotated by the operation of the interlocking lever 12 to push down the earth leakage display portion 5 against the return spring 20. When the stopper 17 moves away from the hole edge of the through hole 16 due to the lowering of the through hole 16, the plunger 50 returns by the return spring 21 of the plunger 50 and the stopper 17 enters the through hole 16 to set the leakage display unit 5 to the leakage detection standby state. Hold to complete the reset.

30 is a trip test button arranged near the arm 39,
Reference numeral 31 is a return spring thereof, 58 is a power supply line of the circuit portion 15 drawn from the circuit breaker 11, and 59 is a trip test button of the circuit breaker 11.

Although the positioning protrusion 46 is formed on only one of the side plates 45, the positioning protrusion 46 may be formed on both of the side plates 45, and an engaging groove may be formed in the cover 7 so as to face them.

〔The invention's effect〕

According to the trip coil fixing device of the present invention, the bottom piece of the yoke is placed on the mounting plate, the engaging projection is engaged with the engaging hole, and the positioning projection of the yoke is engaged with the engaging groove of the cover. The trip coil can be securely and easily fixed without rattling without increasing the number of parts.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a more detailed exploded perspective view, and FIG. 3 is a front view of the entire leakage trip portion with a cover removed. FIG. 4 is a cross-sectional view of the trip coil, FIG. 5 is a cross-sectional view seen from the lateral direction, and FIG. 6 is an exploded perspective view showing the entire earth leakage breaker. 2 ... Tripping coil, 7 ... Cover, 22 ... Body, 34 ... Yoke, 26 ... Mounting plate, 40 ... Recess, 41 ... Back wall, 42 ... Locking projection piece, 43 ... Bottom piece, 44 ... Engagement hole, 45 ... Both sides, 46 ... Positioning protrusion, 47 ... Lock groove

Claims (1)

[Claims] 1. A body having a recess for mounting parts on its side, and a body mounted on the back wall of the recess of the body to project toward the opening edge of the recess and to form a locking projection at the tip. And a U-shaped bottom piece of which the bottom piece is placed on the mounting board and an engagement hole for engaging the locking projection is formed on the side of the bottom piece facing the opening edge of the recess. A trip coil having a yoke having a positioning projection formed on at least one side of the both sides facing the opening edge of the recess, and a trip coil attached to the body to close the opening edge of the recess and the positioning projection. A device for fixing a trip coil, comprising: a cover having a locking groove for positioning.