JPH0129726Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a block terminal that is installed in a molded circuit breaker or the like and is composed of a terminal plate and a block for connecting electric wires of a main circuit. This type of terminal can be used even if the connecting part of the wire of the main circuit that is connected after installing the circuit breaker at a predetermined location is a bare core wire with the insulation coating of a normal wire removed, or it can be crimped to the core wire. It is desirable to have a structure that allows even a crimp terminal to be freely and easily connected to the terminal board.

[Prior art and its problems]

Conventionally, the terminals of molded circuit breakers and the like mainly have a bare wire clamping structure or a crimp terminal clamping structure, depending on the structure of the connection part of the main circuit electric wire. As is clear from FIG. 2, the block terminal shown in FIG. 1, which is usually widely used as A slit 7 is formed in the side surface of the block 3, which has a screw hole 6 into which the retaining plate 4 is screwed, and the protrusions at both ends of the retaining plate 4 are inserted into the slit 7 and caulked at the parts. It is constructed by joining together. At this time, the holding plate 4 is provided with a hole 9 through which the threaded portion of the female thread 8 can freely go in and out when the terminal plate 2 inserted between the legs of the block 3 and the holding plate 4 are connected.

In the block terminal 1 constructed as described above, when connecting the bare core wire 12 of the connection part of the main circuit electric wire 11 to the terminal board 2, first connect the block terminal 1 to the terminal as shown in FIGS. 1 and 2. Cover the plate 2 in the direction of the arrow, and screw the set screw 8 into the screw hole 10 provided in the terminal plate 2 through the hole 9 of the holding plate 4. As a result, the block terminal 1 is connected to the terminal plate 2 via the holding plate 4. After that, the main circuit wire 11
Insert the bare wire 12 into the block 1 from the opposite side to the terminal plate 2, and press the bare wire 12 with the tightening screw 5 through the screw 6 of the block terminal 1 to form a terminal. Connect to board 2.

When connecting an electric wire having a crimp terminal to the connecting portion of this type of block terminal, the block 3 of the block terminal 1 becomes an obstacle and the crimp terminal cannot be connected to the terminal board 2 as it is. Therefore, in order to connect the crimp terminal 13 of the main circuit electric wire to the terminal board 2, the block terminal 1 is first separated from the terminal board 2 by unscrewing the female screw 8 and the screw hole 10 as shown in FIG. Thereafter, as shown in FIG. 3, the crimp terminal 13 and the terminal plate 2 must be connected to each other by connecting them with a machine screw 14 which is a combination of a spring washer and a small round washer.

As explained above, in conventional block terminals, when using main circuit wires with crimp terminals, the molded circuit breaker is always removed from the predetermined placement location, and the block terminal 1 is connected to the terminal board from the back side of the circuit breaker. The main circuit electric wire 11 having a crimp terminal can be connected to the terminal plate 2 only after unscrewing the screw 8 connected to the terminal plate 2 from the screw hole 10 and separating the block terminal 1 from the terminal plate 2. Because I can't
If the main circuit wire is replaced for some reason after the circuit breaker has been placed in the designated location, the connection should be changed from a wire with a bare core wire to a wire with a crimp terminal, or vice versa. This is particularly inconvenient in places where the work space is narrow. Moreover, the number of parts constituting the terminal portion of the molded circuit breaker is large, and the overall cost is unavoidable.

[Purpose of invention]

In view of the above-mentioned drawbacks of the block terminals used in conventional molded circuit breakers, the present invention proposes a method for converting the connection part of the main circuit wire from a wire with a bare core wire itself to a wire with a crimp terminal, or vice versa. When changing the circuit breaker, the block terminal and the terminal board can be easily attached and detached without removing the circuit breaker from its predetermined location, and the main circuit electric wire can be connected to the terminal board. The purpose is to provide terminals.

[Key points of the idea]

In order to achieve the above-mentioned object, the present invention provides the above-mentioned block terminal with a terminal plate that protrudes inwardly from one side edge of each of the legs of the U-shaped block constituting the block terminal. A guide protrusion and an engaging protrusion are formed in two stages, and a gap is maintained between the upper end of the guide protrusion so that the terminal board can be freely inserted, and the connection part of the main circuit wire is maintained. A retainer plate having screw holes for the tightening screws to be press-connected to the terminal plate is disposed, and both sides of the retainer plate are connected near the free ends of both legs of the block to make them integral, and the block A guide groove and an engagement protrusion disposed inside the guide groove are formed on both sides of the terminal plate in correspondence with the guide protrusion and the engagement protrusion formed in two stages, and the main circuit electric wire A screw hole is provided into which a crimp terminal is screwed, and the guiding protrusion of the block is guided into the guiding groove of the terminal plate, and the engaging protrusion of the block is engaged with the engaging protrusion of the terminal plate. By connecting and holding the block to the terminal plate so that the block can be attached to and detached from the terminal plate, the connecting portion of the main circuit electric wire can be exposed without removing the circuit breaker from its predetermined location each time. Regardless of whether it is a core wire itself or a crimp terminal, it can be connected to the terminal board extremely easily.

[Example of idea]

Hereinafter, the present invention will be explained in detail with reference to the drawings showing embodiments.

Block 3 formed in a U-shape in Fig. 4
A guiding protrusion 31 and an engaging protrusion 32 continuous with and formed at a different level from the guiding protrusion 31 and the engaging protrusion 32 are provided on the side edges of one side of both legs of the block 3, and the guide protrusion 31 and the engaging protrusion 32 are provided near the free ends of both legs of the block 3. In the slit 7 formed in the main circuit wire 1 as shown in FIG.
A holding plate 1 having a screw hole 6 for a tightening screw 5 for press-connecting the bare core wire 12 of the connection part 1 to the terminal plate 2.
The protrusions at both ends of the block 5 are inserted and caulked to be integrally connected to the block 3. At this time, the distance between the upper surface of the guide protrusion 31 and the lower surface of the holding plate 15 is made larger than the thickness of the terminal plate 2 so that the terminal plate 2 can be inserted freely. On the other hand, a guide groove 21 corresponding to the guide protrusion 31 of the block 3 is formed on both sides of the terminal plate 2 having the screw hole 10, and an engaging protrusion of the block 3 is formed inside the guide groove 21. An engaging protrusion 22 corresponding to the protrusion 32 and mutually engaging with the protrusion 32 is formed, and the dimensions of the guide groove 21 are set to have a margin sufficient to easily guide the guide protrusion 31 of the block 3. There is an interference margin between the one engagement protrusion 22 and the engagement protrusion 32 of the block 3 to the extent that they can be lightly press-fitted into each other. Therefore, the terminal plate 2 is inserted above the guide protrusion 31 between the legs of the block 3, and the guide groove 21 of the terminal plate 2 is inserted.
When the guide protrusion 31 of the block 3 is guided and the block 3 is pushed upward, the engagement protrusion 32 of the block 3 and the engagement protrusion 22 of the terminal plate 2 are lightly pressed into each other as shown in FIG. Block 3
is connected and held to the terminal plate 2 at its bottom, thereby forming the block terminal 1.

In order to connect the main circuit electric wire 11 whose connecting portion is the bare core wire 12 to the block terminal 1 configured as described above, the bare core wire 12 is inserted into the block 3 as shown in FIG. The clamping screw 5 may be inserted through the screw hole 6 of the holding plate 15 to press the bare wire 12 against the terminal plate 2. As a result, both are joined and connected.

In addition, in the case of a main circuit wire having a crimp terminal at its connection part, the tip of the tightening screw 5 of the block terminal 1 shown in FIG. Screw 5 until matched
When the terminal board 2 is unscrewed and its head is tapped lightly, the engagement protrusion 22 of the terminal board 2 and the engagement protrusion 32 of the block 3 are disengaged, so that the block 3 can be easily removed from the terminal board 2. Thereafter, as shown in FIG. 3, the crimp terminals 13 of the main circuit electric wires 11 are connected to the terminal plate 2, which has become independent, using machine screws 14 having a combination of a spring washer and a small round washer.

Although the block terminal of the present invention has been explained above mainly in the case of a molded case circuit breaker, it goes without saying that it can be applied to similar circuit breakers in general such as earth leakage circuit breakers. Similar effects can be expected by using

[Effect of idea]

As explained above, the present invention provides a block terminal which is provided in a molded circuit breaker and is composed of a terminal plate and a block for connecting main circuit electric wires, in which both legs of the U-shaped block constituting the block terminal are connected to each other. A guiding protrusion and an engaging protrusion for the terminal board, which protrude inwardly from each other, are formed in two stages on the side edges, and the terminal board is freely positioned between the upper end of the guiding protrusion. A retaining plate is provided with a screw hole for a tightening screw that presses and connects the connecting portion of the main circuit electric wire to the terminal plate, and the both sides of the retaining plate are connected to both legs of the block. are connected near the free end of the terminal plate to make them integral, and guide grooves are formed on both sides of the terminal plate corresponding to the guide protrusion and the engagement protrusion formed in two stages on the block. A screw hole is provided in which a crimp terminal of the main circuit electric wire is screwed, and the guide protrusion of the block is guided into the guide groove of the terminal board. By engaging the engaging protrusions with the engaging protrusions of the terminal board to connect and hold the block to the terminal board, the circuit breaker can be attached to the circuit breaker if necessary after the circuit breaker is placed at a predetermined location. When replacing the connected main circuit electric wire, regardless of whether the connection part of the electric wire is a bare core wire or has a crimp terminal, the circuit breaker can be replaced from the block terminal without removing the circuit breaker from its predetermined location. By easily attaching and detaching the block to the terminal board, connections can be made as appropriate, which greatly simplifies the wiring work, and has the effect of significantly improving work efficiency and making it more economical, especially in cases where the work space is narrow. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the structure and related parts of a conventional block terminal, Fig. 2 is a perspective view showing the conventional block terminal when the main circuit electric wire is connected when the connection part is a bare core wire, and Fig. 3 is a perspective view showing the structure of a conventional block terminal and related parts. The figure is a perspective view showing the connection between the main circuit electric wire and the terminal board when the connection part has a crimp terminal, FIG. 4 is a perspective view showing the structure of the block terminal of the present invention and related parts, and FIG. Each figure is a perspective view showing the block terminal of the present invention when the main circuit electric wire is connected when the connecting portion is a bare core wire. 1...Block terminal, 2...Terminal board, 3...Block, 5...Tightening screw, 6...Screw hole, 10
... Screw hole of terminal board, 15 ... Holding plate, 21 ...
Guide groove for terminal board, 22... Engagement protrusion for terminal board, 31... Guide protrusion for block, 32...
Engagement protrusion of block.

Claims (1)

[Scope of utility model registration request] In a block terminal which is provided in a molded circuit breaker and is composed of a terminal plate and a block for connecting electric wires of the main circuit, there are two terminals connected to each other on one side edge of each of both legs of the U-shaped block constituting the block terminal. A guiding protrusion and an engaging protrusion for the terminal board protruding inward are formed in two stages, and a gap is provided between the upper end of the guiding protrusion and the terminal board such that the terminal board can be freely inserted. A retaining plate is provided with a screw hole for a tightening screw for press-connecting the connecting portion of the main circuit electric wire to the terminal plate, and both sides of the retaining plate are connected near the free ends of both legs of the block. to integrate each other, and to add two parts to the block.
A guide groove and an engagement protrusion arranged inside the guide groove are formed on both sides of the terminal plate in correspondence with the guide protrusion and the engagement protrusion formed in steps, and the main circuit electric wire is crimped. A screw hole for screwing a terminal is provided, a guide protrusion of the block is guided into a guide groove of the terminal plate, an engaging protrusion of the block is engaged with an engaging protrusion of the terminal plate, and the block is closed. A block terminal for a molded circuit breaker, characterized in that the block terminal is connected to and held by the terminal plate.