JP5166985B2 - Circuit breaker with conductive terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive terminal device of a circuit breaker capable of simply making connection with a beltlike bus wire with small force even if capacity of the circuit breaker becomes large. <P>SOLUTION: The beltlike bus wire is held by tensional pressure of a coil spring 4 at one end side of two contact plates 1a, 1b, wherein thickness surfaces of longitudinal one side each are oppositely arranged, formed at an approximately rectangular form, and the other end side each of both contact plates 1a, 1b is electrically connected with a terminal metal fitting 7 of the circuit breaker 8. Opposite longitudinal one sides of both contact plates are respectively formed by curved surfaces 11 projected outward from an end at one end side, first perpendicular surfaces 12, gradually expanding tapered surfaces 13, and second perpendicular surfaces 14 in that order. An expanded plate 2 is locked and retained between the second perpendicular surfaces 14 (retaining position) of both contact plates 1a, 1b. An opposite distance of the curved surfaces 11 of both contact plates 1a, 1b is more enlarged than a thickness of the beltlike bus wire by moving the expanded plate 2 between the first perpendicular surfaces (extending position) of both contact plates 1a, 1b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a circuit breaker conductive terminal device for connecting a circuit breaker attached to a switchboard to a strip-shaped bus (bus bar) as a power bus.

  Generally, a circuit breaker that supplies power to a load is connected to a power supply bus when attached to a switchboard. The circuit breaker is connected to the power supply bus by sandwiching the strip bus with a bifurcated clip (contact plate) provided on the back. The bifurcated contact plate is urged by a spring pressure in the direction of narrowing the facing distance between the contact plates. Usually, the facing distance between the contact plates is smaller than the thickness of the strip bus.

  In order to sandwich the strip-shaped bus bar with the bifurcated contact plate, both the contact plates are in contact with the edge of the strip-shaped bus bar in the width direction and further press the circuit breaker to resist the action of spring pressure. Sliding in the width direction of the belt-like busbar while widening the facing interval between them. Both contact plates sandwich the strip-shaped bus bar at a position where the electrical contact surface stably contacts the flat portion of the strip-shaped bus bar. The circuit breaker is attached and fixed to the switchboard when both contact plates are in stable contact with the strip bus.

  However, when the capacity of the circuit breaker increases, it is necessary to increase the spring pressure, and a large force is required for connection with the strip-shaped bus. In order to solve this problem, it has been proposed to reduce the force required for connection to the belt-like bus bar by using two sets of contact plates at different positions in contact with the belt-like bus bar. This is described, for example, in Patent Document 1 below.

JP 2005-19199 A

  In the prior art, since the strip bus contacts and slides on one set of contact plates and then contacts the other set of contact plates, the force at the start of contact sliding can be reduced. When moving, it still has the problem of requiring a large force.

An object of the present invention is to provide a circuit breaker including a conductive terminal device that can be easily connected to a strip-shaped busbar with a small force even when the capacity of the circuit breaker increases.

A feature of the present invention is that two contact plates each having a substantially rectangular shape and having a thickness surface on one side in the longitudinal direction facing each other are composed of a plurality of plates arranged side by side. One end side of the contact plate is a conductive terminal device of a circuit breaker which is electrically connected by contacting a terminal fitting fixed to the circuit breaker while the other end side is sandwiched by a spring pressure with a strip-shaped busbar. The opposing longitudinal sides of both contact plates are formed with a curved surface projecting outward from one end side end, a first vertical surface, a gradually expanding taper surface, and a second vertical surface in order, and at the other end side end portion. Is formed with an outwardly projecting curved surface that is fitted to the terminal fitting, and is provided with an expanding plate that is latched and held between the second vertical surfaces of the contact plates. Before sandwiching the strip-shaped busbar, the expansion plate is moved to the first suspension of the contact plates. The contact plate is moved between the surfaces and pressed and locked, so that the distance between the curved surfaces of both contact plates is larger than the thickness of the strip-shaped busbar, and the expansion plate pressed and locked between the first vertical surfaces is The spread plate that is pressed by contact and moved between the second vertical surfaces to be locked is formed by a flat plate that is attracted and moved by a magnet, and is fixed to the circuit breaker. The fixed plate is brought into contact with the end surface of the fixing plate and is held and held between the second vertical surfaces .

  According to the present invention, the curved plates of both contact plates are moved by press-fitting the expanded plates between the second vertical surfaces (holding positions) of the two contact plates arranged opposite to each other and between the first vertical surfaces (expanded positions). Since the facing interval is made larger than the thickness of the strip-shaped busbar, the connection with the strip-shaped busbar can be easily performed with almost no force. The movement of the expansion plate from the holding position to the expansion position is small, for example, by attracting the expansion plate using a jig equipped with a magnet and locking the expansion plate from a tapered surface wider than the width of the expansion plate. Can be done with force.

  An embodiment of the present invention will be described below with reference to the drawings.

  1 and 2 show an embodiment of the present invention. FIG. 1A is a configuration diagram of a conductive terminal device of a circuit breaker according to an embodiment of the present invention, and FIG. 1B is a configuration diagram in a state where a fixing plate and a fixing bolt of FIG. 1A are removed. FIG. 2 is a side view of FIG.

  1 and 2, the pair of contact plates 1 (1a, 1b) are formed in a substantially rectangular shape, and the thickness surfaces on one side in the longitudinal direction are arranged to face each other. The pair of contact plates 1a and 1b constitute a clip for sandwiching the strip-shaped bus bar. Each of the pair of contact plates 1a and 1b is arranged side by side. The number of juxtaposed contact plates 1a and 1b is determined by the current capacity of the circuit breaker.

As shown in FIG. 3, the contact plate 1 is formed in a substantially rectangular shape, and has a curved surface 11, a first vertical surface 12, a gradually expanding taper surface 13, and a second vertical surface protruding outward from one end of one side in the longitudinal direction. Surface 14 is formed sequentially. A curved surface 16 protruding outward is also formed at the end of the contact plate 1 on the other end side. The curved surface 11 of the contact plate 1 serves as an electrical contact surface that contacts and sandwiches the strip-shaped bus bar, and the curved surface 16 serves as an electrical contact surface that contacts the terminal fitting 6 of the circuit breaker 10.

Two engaging grooves 15 a and 15 b are provided between the second vertical surface 14 and the curved surface 16 on one side in the longitudinal direction of the contact plate 1. The spacing plates 3a and 3b are engaged with the engaging grooves 15a and 15b. Further, a U-shaped groove 17 is provided at a substantially central portion on the other side in the longitudinal direction of the contact plate 1. Pins 7 a and 7 b for hooking the coil spring 4 are mounted in the U-shaped groove 17.

  The four contact plates 1a and 1b arranged side by side are engaged with the groove 31 of the spacing plate 3a and 3b as shown in FIG. Are brought into contact with the fixing plates 5a and 5b. The spacing plates 3a and 3b are substantially rectangular as shown in FIG. 5, and four grooves 31 are formed on each of the two short sides. In addition, two claws 32 are formed on each of the two long sides of the spacing plates 3a and 3b, and a vent hole 33 is formed in the center of the spacing plates 3a and 3b.

  Semi-circular hooks 41 formed at both ends of a coil spring (tensile spring) 4 are hooked on the pins 7a and 7b mounted in the U-shaped grooves 17 of the contact plates 1a and 1b. Only one coil spring 4 is provided between the two contact plates 1a and 1b. In the illustrated example, there are four contact plates 1a and 1b, and two coil springs 4 are provided. The pins 7 a and 7 b are also divided by the number of coil springs 4.

The spreading plate 2 is latched and held between the second vertical surfaces 14 of the contact plates 1a and 1b. As shown in FIG. 4, the spreading plate 2 has a flat rectangular shape, and legs 21 extending in the width direction are formed at the four corners. The length L1 in the width direction of the spread plate 2 is such that when the spread plate 2 is moved between the first vertical surfaces 12 of the contact plates 1a and 1b and pressed and locked, the facing interval (minimum facing interval) of the curved surface 16 is a belt shape. It is designed to be larger than the bus bar thickness. The distance L2 between the two legs 21 is slightly larger than the distance L3 (shown in FIG. 2) between the four contact plates 1.

  As shown in FIG. 6, the fixing plate 5 has a rectangular shape. Two corners are chamfered in a circular shape, and the other two corners are chamfered in a straight line. A mounting port 51 is drilled on the chamfered side, and two square holes 52 are drilled. When the fixing plates 5a and 5b are brought into contact with the contact plates 1a and 1b at both ends of the contact plates 1a and 1b, the two claws 32 of the spacing plates 3a and 3b pass through the two square holes 52, respectively. The claw 32 is caulked after passing through the square hole 52.

The contact plates 1a and 1b integrated with the expansion plate 2, the coil spring 4, the spacing plates 3a and 3b, and the fixing plates 5a and 5b are terminals fixed to the circuit breaker 8 with the curved surface 16 on the other end side. The metal fitting 6 is contacted and fitted. Contact plate 1a, the fixing plate 5a while fitting the 1b to terminal 6, screwed bolts 61 to a mounting opening 51 and the threaded hole 62 of the terminal fitting 6 and 5b are fixed. The contact plates 1a and 1b are fixed to the terminal fitting 6 and electrically connected.

  Next, a description will be given of connecting and electrically connecting to the strip-shaped bus.

  The connection with the strip-shaped busbar is performed using a jig. An example of the jig is shown in FIG. The jig 9 is provided with a cylindrical fixed handle 92 at the open leg end of the U-shaped metal fitting 91, and rods 94 are respectively inserted into the two guide holes drilled in the abdomen of the metal fitting 91. One end of the two rods 94 is fixed to the pulling handle 93, and the other end is attached with a magnet holder 95 formed of an insulating material.

  The magnet holder 95 is similar in shape to the space formed by the tapered surfaces 13 and the second vertical surfaces 14 of the contact plates 1a and 1b, and is slightly smaller than the space shape. Two magnets 96 are attached to the magnet holder 95. The metal fitting 91 is provided with a stopper 97 that contacts the contact plates 1a and 1b.

Now, in a state in which the spreading plate 2 is locked and held between the second vertical planes (holding positions) 14, the facing interval g1 of the contact plates 1a and 1b is caused by the spring pressure of the coil spring 4 as shown in FIG. It is smaller than the thickness d (plate thickness) of the strip-shaped busbar 10. The relationship between the facing gap g1 and the plate thickness d is d> g1. As shown in FIG. 8A, the spread plate 2 is held and held in contact with the plate end face side in which the two corners of the fixing brackets 5a and 5b are linearly chamfered at the holding position 14.

  In the state of FIG. 7A, as shown in FIG. 10A, the contact plate is formed into a spatial shape in which the magnet holder 95 of the jig 9 is formed by the tapered surface 13 and the second vertical surface 14 of the contact plates 1a and 1b. Insert from the side of 1a, 1b. A magnet 96 attached to the magnet holder 95 attracts the spread plate 2. After the magnet 96 attracts the expansion plate 2, the pulling handle 93 is pulled up as shown in FIG. 10B, and the expansion plate 2 is moved between the first vertical planes (expansion position) 12.

  When the expanding plate 2 is moved to the expanding position 12 and the pulling handle 93 is further pulled up, the opposing distance of the spherical surface 11 is much smaller than the opposing distance of the expanding position 12, so that the magnet 96 disengages the expanding plate 2 from being attracted. Become. Therefore, the expansion plate 2 is pressed and locked to the expansion position 12 as shown in FIG.

  In a state where the expansion plate 2 is pressed and locked at the expansion position 12, the facing distance g2 of the contact plates 1a and 1b is against the spring pressure of the coil spring 4 as shown in FIG. It becomes larger than thickness d (plate thickness). The relationship between the facing distance g2 and the plate thickness d is g2> d.

The terminal metal fitting 6 (circuit breaker 8) is moved toward the strip-shaped bus bar 10 in a state where the expanded plate 2 is press-fitted and locked at the expanded position 12, and the strip-shaped bus bar 10 is moved to the opposing gap g2 of the contact plates 1a and 1b. Accept. When the end in the width direction of the strip-shaped bus bar 10 reaches the expanded position 12 and abuts against and presses against the expanded plate 2, the expanded plate 2 is disengaged from the press contact at the expanded position 12 as shown in FIG. To the holding position 14.

  When the expansion plate 2 is removed from the expansion position 12, the facing distance between the contact plates 1a and 1b becomes the plate thickness d of the strip-shaped bus 10. Therefore, as shown in FIG. 7C, the strip-shaped bus bar 10 is held in contact with the spherical surface 11 which is the electrical contact surface of the contact plates 1a and 1b.

  In this way, the circuit breaker is connected to the strip-shaped bus bar. In the present invention, the expansion plate is disposed between the second vertical surfaces (holding position) of the contact plates disposed opposite to each other and between the first vertical surfaces (expansion position). ), And the pressure contact locking between the curved surfaces of both contact plates is made larger than the thickness of the strip-shaped busbar, so that the connection with the strip-shaped busbar can be easily performed with almost no force. The movement of the expansion plate from the holding position to the expansion position is merely a matter of attracting the expansion plate using a jig equipped with a magnet and locking it to the expansion position from a tapered surface wider than the width of the expansion plate. You can do it.

  Further, since the connection with the strip-shaped bus bar can be performed with almost no force, it is not necessary to perform the chamfering operation at the end portion in the width direction of the strip-shaped bus bar, and a standard strip-shaped conductor can be used.

  Although the above embodiment shows an example in which four contact plates are juxtaposed, it goes without saying that other numbers may be used.

  In the above-described embodiment, since one coil spring is arranged for every two contact plates, it is easy to equalize the spring pressure on the electrical contact surface of each contact plate.

It is a block diagram which shows one Example of this invention. FIG. 1A is a right side view of javascript: CheckImage (1). It is an enlarged block diagram which shows an example of the contact plate of this invention. It is an example block diagram of the expansion board of this invention. It is an example block diagram of the space | interval holding plate of this invention. It is an example block diagram of the fixed plate of this invention. It is connection operation explanatory drawing of this invention. It is connection operation explanatory drawing of this invention. It is an example block diagram of the jig | tool used for this invention. It is connection operation explanatory drawing of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Contact plate 11, 16 ... Spherical surface (electric contact surface), 12 ... 1st vertical surface (expansion position), 13 ... Tapered surface, 14 ... 2nd vertical surface, 15 ... Engaging groove, 17 ... U-shape Groove, 2 ... expansion plate, 3 ... spacing plate, 4 ... coil spring, 5 ... fixing plate, 6 ... terminal fitting, 7 ... pin, 8 ... circuit breaker, 9 ... jig.

Claims (1)

Two contact plates that are formed in a substantially rectangular shape and are disposed so that the thickness surfaces of one side in the longitudinal direction of the substantially rectangular shape are opposed to each other are formed in parallel, and one end side of the two contact plates has a strip-shaped busbar. pinched by the spring pressure, the other end is a conductive terminal device of the circuit breaker that will be electrically connected in contact with the terminal fitting which is fixed to the circuit breaker, longitudinal opposite of the both contact plates One side is formed with a curved surface projecting outward from the end on one end side, a first vertical surface, a taper surface gradually expanding, and a second vertical surface, and the other end on the other end is fitted to the terminal fitting. that curved surface protruding outward are formed, before the become equipped with both contact plates the second spreader plate which is engaging held between the vertical surfaces of sandwiching the strip-shaped bus bars in the both contact plates in, moved sealed pressure engaging said expansion plate between the first vertical surface of the both contact plates The opposing distance of the curved surface of the both contact plates is greater than the thickness of the strip bus, said pressure contact engagement sealed the expanded plate between the first vertical plane and the second vertical surface is pressed by the contact of the strip bus The expansion plate that is moved and held in between is formed by a flat plate that is attracted and moved by a magnet, and is in contact with the plate end surface of the fixed plate fixed to the circuit breaker. A conductive terminal device for a circuit breaker, which is held between the second vertical surfaces .

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