JPH06253425A - Drawing-out mechanism of drawer type breaker - Google Patents

Abstract

PURPOSE:To obviate a guide rail and reduce the number of components and the manhours in manufacture, and cut down the cost by constituting the head of a fixing axle so as to contact with a guide frame, and making the guide frame bear the role of the guide rail thereby. CONSTITUTION:A cone 10D equipped with a conical incline is made at the hexagonal head 10a of fixing axle 20 so that it may contact with the side plate 9A of a guide frame 9. Moreover, for the shape of the cone 10D, it is made in such shape that the axle 4 can be accommodated smoothly with in the frame of guide frame 9 when placing a breaker 1 on a floor plate 3. Accordingly, since it can contact with the side plate 9A of the cone 10D, a wheel 4 is guided in advance direction. Hereby, the guide rail can be omitted, and the cost can be cut down.

Description

Detailed Description of the Invention

[0001]

This invention is housed in a switchboard,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer type breaker withdrawal mechanism that can be withdrawn to the outside of a switchboard by a wheel provided at the bottom.

[0002]

2. Description of the Related Art A drawer type circuit breaker is stored in a storage frame installed in a circuit breaker room of a switchboard, and when the circuit breaker is stored in its regular position, a disconnecting contact provided behind the circuit breaker is used. The main circuit is formed by contacting the disconnecting terminal on the main circuit side, and when the breaker is pulled out of the switchboard, the disconnecting contact is disconnected from the disconnecting terminal on the main circuit side to disconnect the main circuit. Has been done.

FIG. 4 is a front view showing a state in which such a conventional drawer type circuit breaker is mounted on a storage frame of a switchboard.
A storage frame 2 for accommodating the circuit breaker 1 is provided with a floor plate 3, and wheels 4 for receiving the weight of the circuit breaker 1 are arranged on the floor plate 3 in front of and behind the bottom of the circuit breaker 1 (the left side in FIG. 4 is the front side). There is. Wheel 4
Are also arranged on both sides of circuit breaker 1 (depth side in Fig. 4), and a total of 4
It is provided individually. A disconnecting contact 5 is arranged behind (right side) the circuit breaker 1, and a disconnecting terminal 6 on the main circuit side is arranged in the housing frame 2 via an insulator 8. FIG. 4 is a view in which the disconnection contactor 5 and the disconnection terminal 6 are in the disconnection state. Circuit breaker 1
By pushing to the right, the disconnecting contact 5 is fitted into the disconnecting terminal 6, and the circuit breaker 1 is connected to the main circuit.

FIG. 5 is a view taken in the direction of arrow A in FIG. 4, and the circuit breaker 1 is not shown. The disconnection terminals 6 are arranged side by side for three phases and are brought into contact with and separated from each phase disconnection contactor on the circuit breaker side not shown. Guide rails 7 are attached to both sides of the top surface of the floor plate 3 of the storage frame 2, and the left end portion 7A of the guide rail 7 is inclined. FIG. 6 is a view on arrow B of FIG. As for the disconnection terminal 6, the one for three phases is the upper and lower two
A total of 6 are arranged in rows. A disconnecting contact (not shown) is provided so as to face each of the disconnecting terminals 6.

FIG. 7 is an enlarged front view of the portion C of FIG. 6 and also includes the circuit breaker 1. Base 1 at the bottom of circuit breaker 1
The fixed axle 10 is fixed via A by a spring washer 12 and a nut 11. Wheels 4 are rotatably supported on the fixed axle 10 via bearings (not shown). The floor plate 3 has its end bent twice in a U shape, and the side plate 9A forms a guide frame 9 including a horizontal plate 9B. The wheel 4 is housed in the frame of the guide frame 9 and is arranged at a position along the guide rail 7. The wheels 4 are guided in the traveling direction by the guide rails 7. The horizontal plate 9B serves as a jump stopper that prevents the wheel 4 from floating upward.

FIG. 8 is a view on arrow D in FIG. 7, and FIG.
It is the side view which took out and showed only the fixed axle 10 of this.
In FIG. 8, a part of the side plate 9A of the guide frame 9 is shown to be crushed so that the fixed axle 10 can be seen. The fixed axle 10 has a hexagonal head portion 10A, and the pedestal 1
The head 10A can be fixed so as not to rotate with a spanner when the nut is tightened to A. As shown in FIG. 9, the fixed axle 10 has a hexagonal head portion 10A and a columnar shaft portion 10.
B, consisting of a threaded portion 10C. As described above, the head portion 10A is a portion on which the spanner is hooked, and the shaft portion 10B is a portion fitted to the wheel. Further, the screw portion 10C is the shaft portion 10
It is a portion which is formed thinner than B and is fitted with a nut after penetrating the pedestal.

Returning to FIG. 7, the fixed axle 10 is fixed to the base 1A with the shaft 10B pressing the base 1A. The head 10A also serves as a retainer for the axle 4. In FIG. 5, the left end portion 7A of the guide rail 7 is
Inclination processing is performed for mounting the circuit breaker on the floor board 3 from the outside and for running its wheels along the guide rails 7. The circuit breaker can be smoothly stored in the storage frame 2 by the inclination processing.

[0008]

However, the above-mentioned conventional device has a problem that the guide rail is required, and the number of parts of the guide rail and the number of man-hours for attaching the guide rail are large. For each circuit breaker, two guide rails were required on each side, which required man-hours such as inclining at the end and welding work on the floor plate. Further, in the welding work, the two guide rails had to be parallel to each other, so that careful attention was required.

An object of the present invention is to reduce costs by omitting guide rails.

[0010]

In order to achieve the above object, according to the present invention, a wheel housed in a switchboard and rotatably supported by a fixed axle provided at the bottom is pulled out of the switchboard. A drawer mechanism of a draw-out circuit breaker that can be provided, wherein the guide frame is fixed to both sides of a floor plate that is in contact with the lower surface of the wheel and extends in the front-rear direction, and a guide frame that guides the wheel in the traveling direction is provided. It is assumed that the head portion of the fixed axle is formed so as to be in contact with the guide frame, and in this configuration, the head portion of the fixed axle is provided with a conical inclined surface.

[0011]

According to the structure of the present invention, since the head portion of the fixed axle is formed so as to contact the guide frame, the wheel can be guided in the traveling direction without the guide rail, which is conventionally required. In addition to such a configuration, since the head portion of the fixed axle has the conical inclined surface, the wheel can be smoothly housed in the frame of the guide frame when the circuit breaker is placed on the floor plate.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an enlarged front view of an essential part showing a drawing mechanism of a draw-out type circuit breaker according to an embodiment of the present invention. Fixed axle 2
No. 0 hexagonal head portion 10A is provided with a conical portion 10D having a conical inclined surface, and the conical portion 10D forms the guide frame 9
It is formed so as to contact the side plate 9A.

FIG. 2 is a view taken in the direction of arrow P in FIG.
A part of the side plate 9A is crushed so that the fixed axle 20 can be seen. Further, FIG. 3 is a side view showing only the fixed axle 20 of FIG. 1 to 3
Is the same as the conventional device except that the head portion 10A includes a conical portion 10D in contact with the side surface plate 9A and the guide rail is omitted. The same parts are designated by the same reference numerals, and detailed description thereof is omitted.

In FIG. 1, the conical portion 10 of the fixed axle 20.
The shape of D is a shape that allows the wheels 4 to be smoothly stored in the frame of the guide frame 9 when the circuit breaker 1 is placed on the floor plate 3. Since the conical portion 10D is in contact with the side plate 9A,
The wheels 4 are guided in the traveling direction. It should be noted that the fixed axle 20 may have its end contacting the side surface plate 9A. Therefore, instead of the conical portion 10D, for example, a hemispherical or elliptical shape may be attached to the hexagonal head 10A. Also,
A free bearing in which a part of the steel ball is exposed may be attached on the head 10A and the steel ball may be brought into contact with the side plate 9A.

Since the fixed axle 20 of FIG. 1 is manufactured integrally with the conical portion 10D, the number of parts of the fixed axle 20 does not increase as compared with the conventional device. Therefore, in the configuration of the present invention, the total number of parts is reduced as compared with the conventional device because the guide rail is omitted.

[0016]

As described above, according to the present invention, the head portion of the fixed axle is configured to come into contact with the guide frame, and the guide frame serves as a guide rail. As a result, the guide rail can be omitted, and the cost of the device can be reduced by reducing the number of parts and manufacturing man-hours. Further, since the head portion of the fixed axle is provided with the conical inclined surface, the circuit breaker can be smoothly placed on the floor plate, and the work of storing the circuit breaker becomes very easy.

[Brief description of drawings]

FIG. 1 is an enlarged front view of an essential part showing a drawer mechanism of a drawer type circuit breaker according to an embodiment of the present invention.

FIG. 2 is a view on arrow P of FIG.

FIG. 3 is a side view showing only the fixed axle shown in FIG.

FIG. 4 is a front view showing a state in which a conventional drawer type circuit breaker is placed on a storage frame of a switchboard.

5 is a view on arrow A of FIG.

FIG. 6 is a view on arrow B of FIG.

FIG. 7 is an enlarged front view of part C of FIG.

FIG. 8 is a view on arrow D of FIG.

FIG. 9 is a side view showing only the fixed axle shown in FIG.

[Explanation of symbols]

1: Circuit breaker, 1A: Pedestal, 20: Fixed axle, 10A: Head, 10B: Shaft, 10C: Screw, 10D: Cone,
9: Guide frame, 9A: Side plate, 9B: Horizontal plate, 3: Floor plate, 4: Wheel, 11: Nut, 12: Spring washer

Claims (2)

[Claims] 1. A drawer mechanism of a drawer type circuit breaker which is housed in a switchboard and can be drawn out of the switchboard by a wheel which is rotatably supported by a fixed axle provided at the bottom, and which is in contact with the lower surface of the wheel. It is fixed on both sides of the floorboard that extends back and forth,
A drawer mechanism of a drawer breaker, characterized in that a guide frame for accommodating wheels and guiding the same in a traveling direction is provided, wherein a head portion of the fixed axle is formed to be in contact with the guide frame. 2. A drawer mechanism for a drawer type circuit breaker according to claim 1, wherein the head portion of the fixed axle has a conical inclined surface.