JPS6126174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit protector that cuts off current when an overcurrent occurs, and in which side pieces 2b, 2b are extended from both ends of a central piece 2a to form a movable contact plate 2 in a U-shape. A tension piece 22 is provided on the central piece 2a of the movable contact plate 2 between the two side pieces 2b, extending parallel to each side piece 2b, and a tension piece 22 is provided at the tip of the side piece 2b to extend in the direction in which the side piece 2b extends. A long hole 25 is bored, and the return spring piece 24 is made to extend from the tip of the side piece 2b of the movable contact plate 2,
A long hole 2 is formed on a mounting protrusion 30 that protrudes on the body 1 with the movable contact 4 provided on the center piece 2a of the movable contact plate 2 facing the fixed contact 3 provided on the body 1.
5 is inserted into the side piece 2 of the movable contact plate 2.
b is fixed, and the tip of the tension piece 22 is tension-locked on the body 1, and each side piece 2 of the movable contact plate 2 is fixed.
b is reversely curved toward the fixed contact 3 side, and curved convexly toward the side opposite to the fixed contact 3, and the movable contact 4 of the movable contact plate 2 is brought into contact with the fixed contact 3 in a removable manner by reversely curving each side piece 2b. This circuit protector is characterized in that a reset button 9, which is reversed by pressing the side piece 2b of the movable contact plate 2, is attached to a return spring piece 24.

A conventional circuit protector that cuts off the current when an abnormal overcurrent flows, as shown in FIG. However, when the movable contact 4 is brought into contact with the fixed contact 3 again, the pedestal 31
By pushing the reset button 9, which is biased upward by the return spring 32 attached to the terminal, downward, and pressing the movable contact plate 2 with the reset button 9, the movable contact plate 2 is reversed from the two-dot chain line to the solid line. This is to perform a reset. However, in such a conventional example, the return spring 32 for biasing the reset button 9 upward is required as a separate member, which is disadvantageous in terms of cost and assembly man-hours. Furthermore, in order to adjust the amount of bending deformation of the movable contact plate 2 to adjust the overcurrent interrupting characteristic, a conventional structure was used as shown in FIG. 2. That is, in FIG. 2, the movable contact plate 2 is integrally connected to the inside of the frame from the tip of the side member 15 in the shape of a square frame, and the free end of the movable contact plate 2 is fixed to the body 1. Locking piece 17 of tension plate 16
The movable contact plate 2 is bent by hooking the side member 15 on the side member 15 and pulling the side member 15, and as shown in FIG. is reversed and the movable contact 4 is released from contact with the fixed contact 3. In this case, as shown in FIG. 4, when the jig 18 is placed on the lower surface of the center piece 19 at the base of the locking piece 17 and the center piece 19 is partially crushed with the punch 21, the size of the center piece 19 is expanded. The tension on the side member 15 by the locking piece 17 is loosened, and the warpage of the movable contact plate 2 is reduced. Also, when the jig 18 is applied to the lower surface of the side piece 20 on both sides of the tension plate 16 and the side piece 20 is crushed with the punch 21, the side As the size of the piece 20 increases, the tension of the side member 15 increases, and the warpage of the movable contact plate 2 increases. In this way, the movable contact plate 2
This means that the overcurrent characteristics of the device can be adjusted. However, this method requires the tension plate 16 as a separate member, which is disadvantageous in terms of cost and assembly work, and also requires a jig for adjustment.

The present invention has been made in view of the above points, and does not require a return spring as a separate member or an independent member for adjusting overcurrent cutoff characteristics, making it inexpensive and reducing the number of assembly steps. The purpose is to provide a circuit protector that can.

The present invention will be explained in detail below with reference to Examples. FIG. 5 shows an embodiment of the present invention, in which an inverted L-shaped fixed contact 3 is mounted on a body 1. Movable contact plate 2
is formed into a U-shape by extending side pieces 2b, 2b from both ends of the center piece 2a, and has a long hole 2 at the tip of the side piece 2b.
5 is perforated. Also, the center piece 2 of the movable contact plate 2
A tension piece 22 extends from a portion a, and locking pieces 32 extend from both sides of the tip of the tension piece 22. Also, return spring pieces 24 extend from both ends of the movable contact plate 2 and are bent upward. A pair of mounting protrusions 30 and a locking protrusion 23 are protruded from the body 1.
Reference numeral 26 denotes a positioning portion projecting from the upper end of the mounting projection 30. When attaching the movable contact plate 2 to the body 1, position the movable contact plate 2 as shown in FIG.
0, and by locking the locking piece 32 at the tip of the tension piece 22 with the locking protrusion 23, the movable contact plate 2 is pulled and the side piece 2b of the movable contact plate is bent. . A pair of attachment holes 28, 28 are bored in the return spring piece 24, and a pair of holding protrusions 29, 29 of the reset button 9 are inserted therein, respectively. Therefore, when the movable contact plate 2 is curved downward, the movable contact 4 at the tip of the movable contact plate 2 contacts the fixed contact 3 and is energized.
When the movable contact plate 2 is reversed and curved upward, the movable contact 4 moves downward and the contact with the fixed contact 3 is dissociated, and the current supply is cut off. This movable contact 4
To reset the movable contact plate 3 from a state in which it is separated from the fixed contact plate 3 to a state in which it contacts again, the reset button 9 is pushed downward against the return spring piece 24, and the movable contact plate is The contacts are reset to the closed state by pressing the curved center portion of the side piece 2b of the contact plate 2 and inverting the movable contact plate 2 downward.

As described above, in the present invention, the return spring piece is extended from the tip of the side piece of the movable contact plate, and the reset button for pressing the movable contact plate is attached to the return spring piece. There is no need to attach a return spring for force as an independent member, and the number of parts can be reduced, the construction can be made at low cost, and the number of assembly steps can be reduced. In addition, a long hole is drilled in the tip of the side piece of the movable contact plate, and the tip of the movable contact plate is fixed to the mounting protrusion on the body using a driving stud inserted through the long hole, so the overcurrent interrupting property is improved. The adjustment can be made by selecting the driving position of the driving rivet on the long axis of the elongated hole, and there is no need to use a special independent member for adjusting the overcurrent interrupting characteristic, which reduces the number of parts. It can be formed at low cost and the number of assembly steps can be reduced.

[Brief explanation of the drawing]

1 and 2 are a sectional view and a perspective view showing a conventional example, respectively, FIGS. 3 and 4 are action explanatory diagrams of the conventional example shown in FIG. 2, and FIG. 5 is an exploded perspective view of an embodiment of the present invention. , FIG. 6 is a partially cutaway enlarged perspective view of the same as above. 1 is the body, 2 is the movable contact plate, 3 is the fixed contact,
4 is a movable contact, 9 is a reset button, 22 is a tension piece,
24 is a return spring piece, 25 is a long hole, and 27 is a driving stud.

Claims (1)

[Claims] 1 A movable contact plate is formed in a U-shape by extending side pieces to both ends of the center piece, and a tension piece is provided in the center piece of the movable contact plate between both sides in parallel with each side piece, and the side pieces are extended parallel to each side piece. Drill a long hole in the end of the side piece in the direction in which the side piece extends,
A mounting protrusion that protrudes from the body with a return spring piece extending from the tip of the side piece of the movable contact plate and a movable contact provided on the center piece of the movable contact plate facing the fixed contact provided on the body. Fix the tips of the side pieces of the movable contact plate with driving rivets inserted through long holes on the body, and tighten and lock the tips of the tension pieces on the body to attach each side piece of the movable contact plate to the fixed contacts. The movable contacts of the movable contact plate are brought into contact with the fixed contacts in a convex manner in a direction opposite to the fixed contact so as to be able to be reversed and curved to the side, and the movable contacts of the movable contact plate are brought into contact with the fixed contact in a removable manner by the reverse curvature of each side piece, and the side pieces of the movable contact plate are pressed. A circuit protector characterized in that a reset button is attached to a return spring piece and the reset button is reversely operated.