JP2020080210A - Terminal metal fitting of circuit breaker - Google Patents

Abstract

To provide a terminal metal fitting of a circuit breaker, which can secure a wide internal space of a device formed inside a cover without deteriorating the strength of the cover.SOLUTION: There is provided a terminal metal fitting 25 of a circuit breaker, which includes a housing composed of a base 10 and a cover 11. The terminal metal fitting 25 has an L-shape that includes an electric wire fixing surface 30 and a rising piece 31 that is raised vertically from the electric wire fixing surface 30, and forms a thin portion 32 at a tip of the rising piece 31, and forms a space in which a part of the cover 11 is the thin portion 32.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a terminal fitting of a circuit breaker for wiring, which includes a housing including a base and a cover.

  The circuit breaker for wiring generally has a structure in which an overcurrent detecting means, a tripping mechanism, and the like are housed inside a housing composed of a base and a cover. The operating handle is projected above the cover, and the terminal fitting is also exposed outside the cover.

  As shown in Patent Document 1 and Patent Document 2, the load-side terminal fitting has an L-shape that includes an electric wire fixing surface formed on the base and a rising piece that is vertically raised from the electric wire fixing surface. In many cases, the tip of the startup piece is connected to the instantaneous trip device.

  In the load side terminal fitting of Patent Document 1, as shown in FIG. 7, in order to avoid the movement restricting wall portion 2 formed on the upper portion of the base 1, the rising piece 3 is bent inward in a crank shape. The structure is covered with a cover 4 from above. The cover 4 covers the outer side (right side) of the start-up piece 3 which is a power application section to prevent an electric shock accident. Reference numeral 8 is an instantaneous trip device in which the tip of the rising piece 3 is welded.

  However, in this structure, since there is a gap between the right end of the cover 4 and the rising piece 3 of the terminal fitting, it is necessary to make a bending allowance in order to bend it in a crank shape. There is a waste in the inner space of the cover 4 indicated by W because a gap is created between the cover 4 and the cover 3. Therefore, there is a problem that the rising piece 3 of the terminal fitting presses the inner space of the cover 4.

  As shown in FIG. 8, the load side terminal fitting of FIG. 2 of Patent Document 2 is provided with a rising piece 5 which is vertically raised from the wire fixing surface formed on the base 1. The corresponding end portion 7 of the cover 6 is thinned. With such a structure, the rising piece 5 of the terminal fitting does not press the inner space of the cover 6 indicated by W.

  However, since the cover 6 is made of resin, a draft is required to mold it with a mold. Therefore, the structure of Patent Document 2 has a problem that the end portion 7 of the cover 6 becomes thin and the strength of the cover 6 is reduced.

JP 2000-294105 A Japanese Patent No. 3228081

  Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and to provide a terminal fitting for a circuit breaker for wiring, which can secure a wide internal space of the equipment formed inside the cover without impairing the strength of the cover. It is to be.

  The present invention made in order to solve the above problems is a terminal fitting for a circuit breaker having a housing including a base and a cover, the wire fixing surface and vertically rising from the wire fixing surface. Is formed in a space formed by forming a thin-walled portion at the tip of the rising piece and making a part of the cover into the thin-walled portion of the rising piece. It is characterized by having done.

  As in claim 2, it is preferable to form a connecting portion of the electric path on the surface of the rising piece opposite to the thin portion. Further, as in claim 3, it is preferable that the base is formed with a pinching portion for pinching the terminal fitting from both left and right sides.

  Since the terminal fitting of the circuit breaker for wiring of the present invention has a structure in which a thin portion is formed at the tip of the rising piece and a part of the cover is formed in this thin portion, the cover is covered. It is not necessary to reduce the thickness of the cover, and the strength of the cover can be secured. In addition, since a useless gap is not formed between the rising piece and the cover, there is an advantage that a large internal space of the device formed inside the cover can be secured.

  If the electric path connecting portion is formed on the surface of the rising piece opposite to the thin portion as in the second aspect of the invention, the heat capacity of that portion of the rising piece is reduced, so that heating is facilitated during welding, and welding of the electric path is performed. Is easier to do.

  As in the invention of claim 3, if the base is formed with the pinching part for pinching the terminal fitting from both left and right sides, the rattling of the terminal fitting can be prevented, and further, the pinching part may press the internal space of the device. Absent.

It is an appearance perspective view of a circuit breaker for wiring of an embodiment. It is sectional drawing of a contact open state. It is an enlarged view of a terminal fitting on the load side. It is a perspective view of the terminal fitting by the side of a load. It is a horizontal cross-sectional view of the circuit breaker of the embodiment. It is an enlarged view of a main part. It is a schematic diagram which shows the structure of patent document 1. It is a schematic diagram which shows the structure of patent document 2.

Embodiments of the present invention will be described below.
FIG. 1 is an external perspective view of the wiring breaker of the embodiment, in which a housing is formed by a base 10 and a cover 11. Reference numeral 12 is a handle protruding from the upper surface of the cover 11, 13 is a load side terminal, and 14 is a power source side terminal.

  FIG. 2 is a sectional view of the contact open state. Reference numeral 15 denotes a fixed contact having a power supply side terminal 14 formed on an upper portion thereof, and a fixed contact 16 is provided on a lower end thereof. A movable contact 17 has a movable contact 18 at its tip. The open end 19 of the movable contact 17 is bent upward, and one end of the twisted wire 20 is welded.

  Reference numeral 21 is a cross bar that pushes down the movable contactor 17, and reference numeral 22 is a spring that is arranged below the movable contactor 17 and elastically urges the movable contactor 17 upward. A known opening/closing link mechanism 23 is arranged between the handle 12 and the crossbar 21, and when the handle 12 is tilted leftward from the position in FIG. 2, the crossbar 21 is pushed down and the movable contact 17 is also pushed down. The movable contact 18 contacts the fixed contact 16.

  The other end of the stranded wire 20 is welded to the lower end of the coil 24. The upper end of the coil 24 is welded to a load-side terminal metal fitting 25, which will be described later, and forms an electric path connecting the power-source side terminal 14 and the load-side terminal 13. Therefore, when a large current flows in the electric path when the movable contact 18 is in contact with the fixed contact 16 and a large current flows in the coil 24, a strong magnetic field is generated in the coil 24, and the armature 26 is attracted to the dashpot 27 at the center of the coil 24 and the known pulling force is applied. The removal mechanism is activated to raise the crossbar 21. At the same time, the movable contact 17 is pushed up by the spring 22 and the circuit is cut off. The power supply side terminal 14 and the load side terminal 13 are shown to be locations where the electric wire fixing surface 30, screws for fixing electric wires, nuts and the like are formed.

  The coil 24 and the armature 26 form an instantaneous trip mechanism. In addition to this, a known overcurrent trip mechanism is also housed inside the housing, and when an overcurrent flows for a predetermined time, The trip mechanism is activated to shut off the circuit.

  The configuration and operation of the circuit breaker for wiring described above are the same as those of the conventional one, but the structure of the terminal fitting 25 on the load side is different from the conventional one, and will be described below.

  FIG. 3 is an enlarged view of the terminal fitting 25 on the load side, and FIG. 4 is a perspective view of the terminal fitting 25 for three poles. The terminal fitting 25 is formed by bending a copper plate and has an L shape as a whole. A lower portion thereof is a horizontal electric wire fixing surface 30, and a screw type load side terminal 13 is provided. Since the wire fixing surface 30 is a part of the crimp terminal, it is assumed that the wire fixing surface 30 has sufficient thickness and strength. An electric wire is directly connected to the electric wire fixing surface 30, or an electric wire is connected via a crimp terminal.

  Reference numeral 31 is a rising piece that is vertically raised from the wire fixing surface 30. As shown in FIG. 3, a thin portion 32 is formed at the tip of the rising piece 31. In this embodiment, the thin portion 32 is formed outside the upper half of the rising piece 31. Since the terminal fitting 25 is a member that forms an electric path, it is not preferable to make the thin portion 32 extremely thin, and the thickness is about 50 to 80% of the other portions. The thin portion 32 may be press-molded or cut. Thus, even if the thickness is reduced by pressing or cutting, the height of the rising piece 31 does not change, and the cover 11 does not rattle.

  As shown in FIG. 3, the end portion 33 of the cover 11 is formed in the space 35 formed by forming the thin portion 32 so as to overlap the end portion 33 of the cover 11 and the thin portion 32, and the terminal fitting 25 It covers the upper side and the side of the rising piece 30 of. With this structure, it is not necessary to form the end portion 33 of the cover 11 to be thin as in the conventional case, and therefore the strength of the cover 11 is not reduced. Further, since the end portion 33 of the cover 11 can be brought into close contact with the rising piece 30 of the terminal fitting 25 or can be arranged at a close distance, it is possible to secure a wide device internal space formed inside the cover 11. .

  As described above, the upper end of the coil 24 is welded to the surface of the load side terminal fitting 25 opposite to the thin portion 32. Since the thin portion has a smaller heat capacity than the thick portion and is easily heated, there is an advantage that welding can be performed easily. The space 35 formed by forming the thin portion 32 has a flat surface on the side opposite to the surface formed so as to overlap the end portion 33 of the cover 11 and the thin portion 32. Can be widely secured.

  FIG. 5 is a horizontal sectional view of the wiring breaker of the embodiment, and FIG. 6 is an enlarged view of the vicinity of the load-side terminal fitting 25. As clearly shown in FIG. 6, the base 10 is formed with a pinching portion 34 that pinches the terminal fitting 25 from both left and right sides. The terminal fitting 25 is attached so as to be dropped into the U-shaped holding portion 34.

  With such a structure in which the terminal fittings 25 are held from the left and right, the rattling of the terminal fittings 25 can be reliably prevented, and the base of the crimp terminal can be reinforced.

  As described above, according to the present invention, it is possible to secure a wide device internal space formed inside the cover 11 without deteriorating the strength of the cover 11 as in the conventional case.

DESCRIPTION OF SYMBOLS 1 Base 2 Wall for restricting movement 3 Startup piece 4 Cover 5 Startup piece 6 Cover 7 End of cover 8 Instantaneous trip device 10 Base 11 Cover 12 Handle 13 Load side terminal 14 Power supply side terminal 15 Fixed contact 16 Fixed contact 17 Movable contact 18 Movable contact 19 Open end 20 Stranded wire 21 Crossbar 22 Spring 23 Open/close link mechanism 24 Coil 25 Terminal fitting 26 Armature 27 Dashpot 30 Wire fixing surface 31 Start-up piece 32 Thin portion 33 End of cover 34 clamp

Claims (3)

A terminal metal fitting for a circuit breaker for wiring, comprising a housing made up of a base and a cover,
It has an L-shape that includes a wire fixing surface and a rising piece that is vertically raised from the wire fixing surface,
Form a thin part at the tip of this startup piece,
A terminal fitting for a circuit breaker for wiring, characterized in that a part of the cover is formed in a space formed by making the rising piece into a thin portion.   The terminal fitting for a circuit breaker for wiring according to claim 1, wherein a connection portion of the electric path is formed on a surface of the rising piece opposite to the thin portion.   The terminal fitting of the circuit breaker for wiring according to claim 1, wherein the base is formed with a holding portion for holding the terminal fitting from both left and right sides.

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