JPH03122937A - Circuit breaker - Google Patents

Abstract

PURPOSE:To facilitate assembly by constructing a frame so that an operating handle and a latch can be installed from the axial direction of the rotation. CONSTITUTION:A left frame 122a, handle spring 45, operating handle 132, link 36, lever 137, latch 139, tripping spring 44, and right frame 122b are set by mechanical means in place in a jig provided in advance, and then a protrusion 129 on the left frame protruding from a square hole 131 in the right frame is caulked to achieve a solidly coupled construction. A framing 121 is accomplished thereby. A handle spring 45 is stretched over between the hooking protrusion 28 on the left frame and the tip of the upper member 36a of link which protrudes from a hole 27 in the operating handle. Assembly is thus made easier through constituting of the framing 121 so that it admits installation of the operating handle 132 and latch 139 from the axial direction of the rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit breaker such as a no-fuse breaker (hereinafter referred to as NFB).

[Conventional technology]

Figures 5 to 10 show conventional NFB,
Figure 5 is an exploded perspective view showing the configuration of the opening/closing mechanism unit (15), and Figure 6 shows the engaged state of the trip spring (44) (Figure a is a side view, Figure (b) is a rear view). Figures 7 to 10 show opening, closing, and tripping of the NFB, respectively.

FIG. 3 is a side sectional view showing a reset operation state. In these figures, (1) is a base, (1a) is a groove provided in the base (1), and (2) is a cover. (3) is the power supply side terminal, (4) is the fixed contact conductor (fixed contact provided in the
6) and a movable contact provided on the movable contact conductor (2), (9) is a flexible copper stranded wire, α is an automatic tripping device having a movable iron piece (11), ( 12)
are load side terminals, and these are connected in series to open and close the circuit. (13) is the opening spring, (
14) is an insulating push plate that slides up and down in the groove (1a) of the base to operate the movable contact conductor (2) up and down, and (15) is an opening/closing mechanism unit 1 whose detailed configuration will be described later. ,
The bottom of the link (36) (described later) is the push plate (14)
It comes into contact with the upper surface of the spring and receives the upward force from the separation spring (13). Next, based on Fig. 5, the opening/closing mechanism unit (
The configuration of 15) will be described. (21) is a frame formed into an inverted U shape by integrally pressing a steel plate, and holes (23a), (23b),
Shaft holes (25a>, (25b) are provided, and mounting feet (26a), (26b) for attaching to the base (1) are provided at the bottom of the frame.Furthermore, on the left side of the frame (21), there are links (described later). (36) is provided with an elongated (27) that engages with the tip of the upper side (36a) and a latching protrusion (28), and a stopper (30) is provided on the right side of the frame (21). 32) is a plastic molded operating handle, which has a support hole (32a) in the center, a hole (33) in the lower part, and protrusions (34) on both sides.
36) is a U-shaped link whose upper side (36a) is inserted into the hole (33) of the operating handle and has a length in which the tip protrudes, and the handle spring (45) is inserted into the protruding tip.
One end (described later) is latched and engaged with the long part (27) to regulate the maximum angle of left and right rotation of the operating handle (32), and the lower side is removable from the upper part of the push plate (14). is engaged with. (37) is a lever, and both arms (38a) are shaped to hold the operation handle (32) from both sides.
, (38b) and rotation holes (38c) provided on both arms and having the same size as the support hole (32a) of the operating handle,
(38d). (35) is the support shaft,
Operation handle support hole (32a), lever rotation hole (3
8c), (38d) and the hole in the frame (23a).

(23b) to rotatably support the operation handle (32) and lever (37). (39)
is a latch made by molding plastic, (40
) is the arm of the latch, (41) is the through hole provided in the central bent part, and (42) is the stepped part provided on the front side of the latch. The latch (39) is rotatably supported by the frame (21) by being inserted through the shaft holes (25a) (25b) and the through hole (41).

(44) is a trip spring attached to the shaft (43) between the frame (21) and the latch (39), and is formed into a torsion coil spring with steel wire wound into a coil. the right side of the frame (21) and the latch (3) as shown in
9) on the rotating shaft (43), and one arm <
44a) on the right side of the frame (21), and the other arm (44a) on the right side of the frame (21).
4b) is engaged with the stepped part (42) of the latch (Fig. 6), applying clockwise rotational force to the latch (39) and hitting the stopper (30) (Figs. 5 and 6). They are kept in contact with each other in a predetermined position. Further, the latch (39) normally comes into contact with the lower part of the lever (37) as shown in FIG. 7, and locks the lever (37) so that it does not rotate counterclockwise. (45) is a handle spring which, when the NFB performs a known tripping operation, pulls the operation handle (32) so that it stands vertically as shown in Figure 9, indicating the tripped state. The opening/closing mechanism unit (15) is constructed as shown in FIG. 7, and is assembled into the base (1) and includes an operation handle (32), a support shaft (35), holes (23a) and (23b). , long hole (27
), the link (36) constitutes a link mechanism (46), and is locked by a latch (39) via a lever (37). That is, the opening/closing contact (2) is a link mechanism (46)
It is opened and closed by an operation handle (32) via a latch (39), and the opening is controlled by a lever (37).

Next, the assembly work of the opening/closing mechanism unit (15) will be explained.

First, insert the upper side (36a) of the link into the hole (33) of the operating handle (32), hook one end of the handle spring (45) to the protruding part, and then connect the link (36) and the handle spring (45). is suspended from the operating handle (32), and after aligning the centers of the support hole (32a) of the lower operating handle with the rotation holes (38c) and (38d) of the lever, insert the frame from below the frame (21). insert it into the frame, align it with the holes (23a) and (23b) in the frame, and insert it into the shaft (
35) into these holes.
6a) further toward the elongated hole (27).
), stretch the handle spring (45) slightly, and attach the other end to the latching protrusion (45) on the lower left side of the frame (
28). At this time, the operating handle (32) is pulled by the handle spring (45) and becomes vertically oriented as shown in FIG. 9 (details will be described later). Next, insert the latch (39) so that its through hole (41) is aligned with the shaft holes (25a) and (25b) of the frame, and then insert the trip spring (44) so that the center axis of its coil portion aligns with the through hole (41). ) and insert the rotation shaft (43) so that it aligns with the center axis of the trip spring (44).
) arms (44a) and (44b) are respectively locked to the stepped part (42) of the latch on the right side of the frame (21) (Fig. 6). , Also, the operation handle support hole (32a>, the lever rotation hole (38c), (38dl), the frame hole (
23a) and (23b), the through hole (41) of the latch, the central axis of the coil part of the trip spring (44), and the rotation hole (25a) of the frame.

(25b) is difficult, so it is all done manually.

Opening/closing mechanism unit assembled as above (1
5) is assembled into the base (1) by machine, and the link (
36) by engaging the lower side with the upper part of the push plate (14) and
Set it in the open state shown in the figure. Other parts, such as the fixed contact conductor (9), the movable contact conductor port, the separation spring (13), and others are also mechanically assembled into the base. When current flows, it operates and attracts the movable iron piece (11) and rotates it clockwise, causing the latch (39) to trip the spring (
The lever (37) is unlocked by rotating it counterclockwise against the spring force of the lever (37).

Since the operation is well known, only the main points will be briefly described. In the open state shown in FIG.
), but it is prevented from rotating by the tip of the upper side (36a) of the link engaged with the left end of the long part (27) and the latch (39) in a predetermined position as shown in Fig. 7. The operating handle (32) is rotated to the left and counterclockwise when the movable contact conductor (7) is stopped in the upper position due to the reaction force from the lever (37) that is locked to the movable contact conductor (7). As shown in FIG. 8, the lower side of the link (36) pushes down the push plate (14) against the force of the opening spring (13), and the upper side (36a) of the link moves beyond the dead center to the right. The contact point (A) is kept in the closed state by moving to the right end of the long part (27). In this closed state, if an overcurrent flows, the automatic trip device operates to rotate the latch (39) from the above-mentioned predetermined position to another position shown in FIG.
37), the opening/closing contact is released, and the zero-order reset operation is performed at the 1st θ.
As shown in the figure, rotate the operating handle (32) clockwise all the way and press the bottom side of the link (36) onto the plate (14).
At the same time, the protrusions (34) provided on both sides of the operating handle raise the lever's both arms (38a),
(38b), rotate the lever (37) clockwise, disengage it from the latch (39), and then latch the lever (37).
39) from the released position shown in FIG. 9 to the predetermined position shown in FIG. 7 by the trip spring (44) and release the operating handle (32), the position shown in FIG. Return to open state.

The reason why the operating handle (32), lever (37), and latch (39) are supported on the same frame (21) is to ensure the dimensional accuracy of each part in order to perform the operations described above. This is to increase the stability and reliability of the operation by ensuring a predetermined accuracy with respect to the positional relationship between the two.

[Problem to be solved by the invention]

As described above, the conventional circuit breaker has an operating handle (32), a lever (37), a latch (39), etc. arranged inside the frame (21) formed in an inverted U shape, and the operating handle ( 32) and lever (37) are frame (21)
It is supported by a common support shaft (35), and when assembled into the frame (21), it must be inserted from below (perpendicular to the axial direction) and aligned. There have been problems in that it is difficult to align each part and takes time to assemble, and it is extremely difficult to assemble by a machine such as an assembly robot.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a circuit breaker that is easy to assemble and can also be easily assembled by machine.

Another object of the present invention is to provide a circuit breaker that is easy to assemble, has a stable operating handle and latch, and has high reliability.

[Means to solve the problem]

A circuit breaker according to the present invention includes a frame fixed to a base, an operating handle rotatably disposed on the frame for opening and closing a switching contact, and a latch for controlling opening and closing of the switching contact. In the above-mentioned frame, the operation handle and the latch can be disposed in the direction of the axis of rotation.

Further, the frame is constructed by integrally joining two frame members, and the operating handle and the latch are pivoted or pivotally supported by both frame members.

[For production]

In this invention, since the frame is configured such that the operating handle and the latch can be disposed in the direction of the axis of rotation thereof, the operating handle and the latch can be placed on the frame at respective predetermined positions from the direction of the axis of rotation. They can be arranged in this order.

In addition, since the frame is constructed by combining two frame members into one body, and the operating handle and latch are upwardly pivoted or pivotally supported on both frame members, the operating handle and latch are attached to one frame member along its rotation axis. After arranging the two frame members at respective predetermined positions in a predetermined order from the direction, the other frame member can be joined together to form a frame, and both frame members stably support the operating handle and the latch.

[Embodiments of the invention]

1 and 2 show one embodiment of the present invention, FIG. 1 is an exploded perspective view showing the configuration of the opening/closing 81 structure unit (115), and FIG. 2 is a side view showing the NFB in the open state. FIG. In these figures, (121) is a frame, which is composed of a left frame (122a) which is one frame member formed by pressing harmonics and a right frame (122b) which is the other frame member. , a protruding shaft (124a) formed by punching on each of the opposing opposing parts of the left and right frames (122a) and (122b).
, (124b) are provided. Also, the left frame (1
22a), there are left and right frames (122a) at the tips of the pillars.
>, (122b) are provided with three protrusions (1291) for fixing them together, and the right frame (122b) has a first square hole (131) that fits with the protrusion (129) on the left frame. Three are provided as shown in the figure. (13
2) is an operating handle with a pair of opposing support shafts (135a) and (135b) on both sides, and an arm (+34) on the back.
), has a hole (33) in the lower part, and is manufactured as an integral molded piece of plastic. (137) is a lever, which is separate from the left and right frame holes (23a) and (23b) that support the support shafts (135a) and (135b) of the operating handle as shown in the figure. Both arms (138a), (138b) are rotatably supported by protruding shafts (124a), (124b) provided at positions, and rotation holes (138c), (138c) provided in these both arms.
38d). (139) is a latch integrally molded from plastic, and has a pair of opposing rotation shafts (143a), (14) protruding from both sides and integrally provided.
3b) are shaft holes (25a) in the left and right frames, similar to the rotation shaft (43) of the conventional device in FIG.

(25b). The configuration of the pond is the same as that of the conventional example shown in FIG. 5, so corresponding parts are given the same reference numerals and a description thereof will be omitted.

The open/open fifli unit (+15) is constructed as described above and assembled as follows. As shown in Fig. 1, all the parts that make up the opening/closing R structure units 1 to 115 are the left frame (115) including the operating handle (+32).
22a>, the parts have a shape that does not overlap each other when viewed from the side so that they can be installed in a specified order in a specified position, and in order to be installed and assembled by machine. Since it is necessary to accurately position the parts, some of the parts are provided with auxiliary holes to determine the position and orientation when they are mounted, but these holes are not shown here.

Now, to get things started, put the left frame (122a), handle spring (45), operating handle (132), link (36), lever (137) into a jig (not shown) prepared in advance.
), latch (+39), trip spring (44), and right frame (122b) in this order using an i-machine. ) are joined together to form a frame (121) by "caulking".The handle spring (45) is attached to the link protruding from the latch protrusion (28) on the left frame and the hole (27) in the operating handle. Top side <36a
The detailed procedure is as follows. A guide pin (not shown) having a hollow portion slightly larger than the diameter of the upper side (36a) of the link in a circular expanded portion (127a) provided in advance near the right end of the elongated hole (27).
protrude from the jig, extend the handle spring (45) and hold it in the machine, and temporarily hang it on the latch protrusion (28) and the guide bottle (therefore, during assembly, the upper side of the link ( The tip of 36a) is inserted into the hollow part of the guide bottle), and after the left and right frames (122a>, 122b) are fixed together as described above, the opening/closing mechanism is removed from the jig. When the unit (+15) is removed, the guide bin remains in its original position, so the handle spring (4)
5) One end is hooked to the tip of the upper side (36a) of the link. In this embodiment, the operation handle (+32), the support shaft (135a), (135b), the hole (23a),
(23b), the long length (27), and the link (36) constitute a link mechanism (146) that opens and closes the opening/closing contact (4), and is locked by a latch (139) via a lever (137).

NFB equipped with such an opening/closing mechanism unit <115)
The operation is the same as that of the conventional NFB shown in Fig. 7, but in the reset operation after automatic tripping,
The conventional NFB has an operation handle (3) as shown in Figure 7.
Push the arms (38a) and (38b) on both sides of the lever using the protrusions (34) provided on both sides of the lever (3).
7) in the clockwise direction, in this embodiment, the arm (134) of the operating handle rotates the lever (+
Push the center of the vertical part of 37) to the left and release the lever (+37).
) is rotated clockwise.

Further, in this embodiment, the operating handle (132) is attached to its support shaft (135a) with respect to the left frame (122a).
is in the hole (23a), and the lever (137) is in the rotation hole (1).
38c) is engaged with the protruding shaft (124a), and the latch (139) is positioned by engaging its rotation shaft (143a) with the shaft hole (25a), so after positioning each component, a separately provided For example, in the conventional example shown in Fig. 5, the latch (
39) into the shaft hole (25a) and then inserting the rotation shaft (43) for the latch (39). The number of component parts is also one less.

FIGS. 3 and 4 show other embodiments of the present invention, in which FIG. 3(a) is a perspective view of the lever (237), FIG. 3(b) is a perspective view of the lever shaft, FIG. 4 is a side sectional view showing the open state of the NFB, and in the reset operation, a lever (237) is used instead of providing an arm on the operation handle (232).
), both arms (238a) and one side (238b) of (238b)
38a) is provided with an extension arm (238e), the tip of which is hooked onto the upper side (36a) of the link protruding from the hole (33) of the operating handle (232), and the protruding shaft (124a) shown in FIG. , instead of (124b), the left and right frames (
122a) and (122b), and when the operation handle <232) is rotated clockwise, the extension arm (238
The tip of e) is moved upward and the lever (237)
The reset operation is performed by rotating clockwise. In this embodiment, as in the embodiment shown in FIG. 2, each part constituting the opening/closing i-structure unit (215) is separated from other parts at a predetermined position when viewed from the front side in FIG. The shape is such that there are no overlapping parts, that is, the shape is such that each component can be sequentially attached to the left frame (122a).

In each of the above embodiments, the support shafts (135a) and (135b) of the operating handle, and the rotation shaft (14) of the latch are
3a>.

(143b) etc. are manufactured by integral molding of plastic with each main body, but the same as the support shaft (35) and rotation shaft (43) of the conventional example shown in Fig. 5 are separately manufactured. It may be provided and inserted during assembly, or the operating handle or latch may be formed by integrally molding the metal support shaft (35) and rotation shaft (43) made in advance during plastic molding. good.

In addition, the necessity of the lever (137), handle spring (45)', link (36), latch (1) in each of the above embodiments
39) can be designed in various ways depending on the configuration of the link mechanism (146) and the drive spring (in this example, the separation spring (13)). For example, in the embodiment shown in FIG.
The opening stroke of the movable contact conductor ■ is reduced, and the latch (
By making the vertical dimension (thickness) of the tip of the link (139) (the part that comes into contact with the lever (137)) larger than the above stroke, the lower side of the link (36) can be directly connected without using the lever (137). It can also be locked.

Furthermore, in each of the embodiments described above, for example, the embodiment shown in FIG.
9) is shown supported by both sides of the left and right frames (122a) and (122b), but if necessary, a cantilevered type can have the same effect.

〔Effect of the invention〕

As described above, according to the present invention, the frame is configured such that the operating handle and the latch can be disposed in the direction of the axis of rotation thereof, so assembly is easy and the working time can be shortened.

Furthermore, since the frame is constructed by integrally joining two frame members, and the operating handle and latch are pivoted or pivoted by both frame members, assembly is easy and work time can be shortened. The latch operates stably and is highly reliable.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is an exploded perspective view showing the configuration of the opening/closing mechanism unit (115), and FIG. 2 is a side cross-sectional view showing the NFB in the open state. 3 and 4 show other embodiments of the present invention, FIG. 3(a) is a perspective view of the lever (237), and FIG. 3(b) is a perspective view of the lever (237).
is a perspective view of the lever shaft, FIG. 4 is a side sectional view showing the open state, and FIGS. 5 to 1θ show the conventional NFB.
The figure is an exploded perspective view showing the opening/closing mechanism unit (15).
The figure shows the engaged state of the trip spring (44) (a
) is a side view, (b) is a rear view, and FIGS. 7 to 1O are open and closed views of the NFB, respectively. FIG. 3 is a side sectional view showing a pullout and reset operation state. In the figure, (1) is the base, (4) is the opening/closing contact, and (2) is the base.
3a), (23b) are holes, (25a), (25b)
is the shaft hole, (121) is the frame, (122a), (
122b) are left and right frames, (132), (232
) is the operation handle, (135a), (135b) is the support shaft, (139) is the latch, (143a), (143
b) is the rotation axis. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a circuit breaker comprising a frame fixed to a base, an operating handle rotatably disposed on the frame for opening and closing the switching contacts, and a latch for controlling the opening and closing of the switching contacts, the frame is A circuit breaker characterized in that the operating handle and the latch are configured so that they can be arranged from the direction of the axis of rotation. (2) A circuit breaker including a frame fixed to a base and rotatably supporting an operating handle for opening and closing a switching contact and a latch for controlling opening of the switching contact,
A circuit breaker characterized in that the frame is constructed by integrally joining two frame members, and the operating handle and the latch are pivoted or pivotally supported by both the frame members.