JP2002190332A - Contact device - Google Patents

Abstract

(57) [Problem] To provide a contact device that is reduced in the number of parts, facilitates assembling, and is downsized. A base (1) is provided between one end of a pair of contacts (3).
And a blade 2 is disposed between the other ends thereof. The elastic holder 23 is provided for pressing the pair of contacts 3 against the base 1 and the blade 2.
Is a stop shaft 21 having a pin hole 21b at one end and a collar 21a at the other end, and a spring 2 which is locked to the collar 21a of the stop shaft 21 and applies a contact pressure to one contact 3b.
0, and a retaining pin 22 that is inserted into the pin hole 21b and locked by the other contact 3a to apply a contact pressure to the contact 3a by the elastic repulsive force of the spring 20.
The number of parts can be reduced and the size can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact device for opening and closing an electric circuit.

[0002]

2. Description of the Related Art A contact device is often used as a disconnector for ensuring the safety of work when repairing or inspecting a circuit breaker such as a VCB or a transformer. The contact device must be easily openable and closable, and must be in reliable contact and have a simple structure. FIG. 9 is a front view showing a configuration of a conventional contact device in which a blade is inserted, and FIG. 10 is a cross-sectional view taken along line DD of FIG. 9 and 10, a conventional contact device includes a base 1 that is a conductor on the VCB or the like and a base 1 that is a conductor on the VCB or the like in order to electrically connect the plate conductor on the VCB or the like and the plate conductor on the power supply side. 1. A pair of contacts 3 arranged on both sides of the base 1 and an elastic holding device 4 for pressing one end of the pair of contacts 3 against both surfaces of the base 1 are provided. The elastic holding device 4 presses the other end to both surfaces of the blade 2 by being inserted between the other ends of the pair of contacts 3 having a width smaller than the width of the contact 2.

The elastic holding device 4 includes a bolt 5 that penetrates the base 1 and the pair of contacts 3 to support the pair of contacts 3 and a pair of the contacts 3.
And a nut 7 that generates a contact pressure on the pressing device 6 by screwing and tightening the bolt 5 on the pressing device 6. The pressing device 6 includes a spring 9
And receiving plates 10 arranged on both sides of the spring 9 in the elastic direction.
And a tube 11 provided in the center of the spring 9 in the elastic direction and penetrating the base 1 and the pair of contacts 3. The bolt 5 is inserted through the center of the receiving plate 10 and the tube 11 in the elastic direction. I have. The bolt 5 inserted through the base 1, the pair of contacts 3 and the pressing device 6 via the washer 8
The end has a screw portion 5a, and a nut 7 is screwed to the screw portion 5a. The nut 7 is in contact with the receiving plate 10 of the pressing device 6. By tightening the nut 7, an elastic repulsive force is generated in the spring 9 of the pressing device 6. On the other hand, the elastic repulsive force is received by the bolt 5 and transmitted to the contact 3a through the head 5b and the washer 8 of the bolt 5, and the contact 3a presses the base 1 and one surface of the blade 2 in the inserted state. On the other hand, the elastic repulsive force of the spring 9 is directly transmitted to the contact 3b via the receiving plate 10, and the contact 3b presses the base 1 and the other surface of the blade 2 in the inserted state. Becomes The nut 7 has a partially different shape, but is a double nut composed of two nuts, thereby preventing the nut 7 from loosening.

[0004] Each of the pair of contacts 3 has a hole 3c in which a bolt 5 is inserted at a substantially central portion, and a contact portion 3d with which the base 1 contacts at one end and a contact 3d at the other end. Have contact projections 3e which are spread outward to facilitate insertion of the blade 2.

[0005] The base 1 is provided with a roll pin 12 for preventing the pair of contacts 3 from rotating around the bolt 5 so that the blade 2 can be reliably inserted between the contact protrusions 3e. It is assumed.

[0006]

In a conventional contact device, an elastic holding device 4 for generating a necessary contact pressure when the blade 2 is sandwiched between a pair of contacts 3 comprises a bolt and a nut, a spring and a receiving plate. And a pressing device having a tube, the number of parts is large, and the assembling requires time and labor. FIG. 11 is a side view showing a state where the contact device is attached to the VCB. As shown in FIG. 11, each contact device does not cause insulation breakdown due to a voltage applied to each contact device. So that the insulation distance between the poles A
And is attached to the VCB with a ground insulation distance B secured. As described above, the pole-to-pole insulation distance A and the ground insulation distance B are indispensable for safety, and downsizing of the contactor device is required to downsize the entire circuit breaker while securing these distances. However, in the elastic holding device 4 of the contact device,
Since it is necessary to provide a margin for tightening the nut to the screw portion of the bolt, the protrusion of the screw portion and the nut portion has been an obstacle to downsizing the contact device.

The present invention has been made in order to solve the above-mentioned problems, and has reduced the number of parts to facilitate the assembly operation and reduced the size by eliminating the projecting portions of the bolt screw portion and the nut. It is intended to obtain a contact device.

[0008]

A contact device according to the present invention comprises a plate-like base, a pair of contacts arranged on both sides of the base, and one end of the pair of contacts on both sides of the base. An elastic holding device that is in pressure contact with the other end of the pair of contacts that is narrower than the width of the blade. A contact device that presses against the contact member, wherein the elastic holding device is provided at one end while supporting a spring that contacts the contact member and applies a contact pressure, and penetrates the base and the pair of contacts. A stop shaft for locking the spring with a brim, and a stopper member detachably attached to the other end of the stop shaft to prevent the stop shaft from coming off.

The contact has a recess in which the spring fits.

Further, the contact has a recess in which the retaining member fits.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a schematic diagram showing the configuration of the contact device according to the first embodiment, and FIG. 2 is a cross-sectional view taken along line BB in FIG. 3 is a front view of the contact of the contact device, FIG. 4 is a side view of the contact, and FIG. 5 is a cross-sectional view taken along line CC in FIG. FIG. 6 is a side view showing the shape of the stop shaft of the contact device. Note that components that are the same as or correspond to those of the conventional example are denoted by the same reference numerals as those of the conventional example.
In FIGS. 1 and 2, the contact device includes a base 1, which is a conductor on the VCB or the like, for electrically connecting the plate conductor on the VCB or the like and the plate conductor on the power supply side.
And a resilient holding device 23 that presses one end of the pair of contacts 3 against both surfaces of the base 1, and the blade 2, which is a conductor on the power supply side, is connected to the blade 2. Is inserted between the other ends of the pair of contacts 3 having a width smaller than the width of the blade 3 so that the elastic holding device 23 presses the other end against the both surfaces of the blade 2.

The elastic holding device 23 includes a spring 20 which contacts one contact 3b and applies a contact pressure, and a collar 21a provided at one end while being pivotally supported through the base 1 and the pair of contacts 3. It has a stop shaft 21 for locking the spring 20 and a stop pin 22 as a stop member detachably attached to the other end of the stop shaft 21 to prevent the stop shaft 21 from coming off. . A pin hole 21b is formed in the other end of the stop shaft 21. A stopper pin 22 is inserted into the pin hole 21b to prevent the stop shaft 21 from coming off. A force always acts in a direction in which the contact 3a is pressed against the base 1 and the inserted blade 2 by the elastic repulsive force of the spring 20 inserted between the collar 21a provided at one end of the 21 and the contact 3b. It is held down and keeps a stable state. At the same time, the elastic repulsive force always acts directly on the contact 3b, and the contact 3b is pressed against the base 1 and the inserted blade 2 to stabilize the state of the contact 3b and hinder the power supply. The contact pressure between the pair of contacts 3 and the base 1 and the blade 2 is kept to such an extent that the contact does not occur.

As shown in FIGS. 3, 4 and 5, each of the pair of contacts 3 is provided with a recess 3f for fitting the spring 20 around the hole 3c.
Is provided with a recess 3g in which the retaining pin 22 fits. For this reason, the retaining pin 22 and the spring 20, which are in contact with the respective contacts 3a and 3b, slide on the contact and the axis of the retaining shaft 21 does not shift, and is always perpendicular and stable to the contact surface of the base 1 and the blade 2. Can be applied. Further, since the contacts 3a and 3b have the same shape, 3b on the spring 20 side and the retaining pin 22
It can be used for either side without discriminating the side 3a, and assembling becomes easy.

As shown in FIG. 6, since the inside of the collar 21a of the stop shaft 21 has a shaft portion having the same diameter as the inside diameter of the spring 20, the spring 20 is fitted into this shaft portion to stabilize the spring 20. Elastic repulsion can be obtained. Other configurations are the same as those of the conventional example.

Since the contact device is configured as described above, the pressing device having the receiving plate 10, the tube 11, and the spring 9 as in the conventional example shown in FIGS. Also, the elastic holding device, which has been supported and fixed by the bolt 5 and the nut 7, is supported and fixed by the stop shaft 21 and the retaining pin 22 as shown in FIG. The protrusion of the nut 7 screwed to the head 5b of the bolt 5 or the thread 5a of the bolt 5 is eliminated, and the center distance of the contact device is reduced while maintaining the inter-electrode insulation distance A shown in FIG. And the contact pressure of the pair of contacts 3 on the base 1 and the blade 2 due to insufficient tightening of the nut 7 does not occur.

Although the retaining pin 22 is inserted into the pin hole 21b of the retaining shaft 21 to prevent the retaining shaft 21 from coming off, the retaining pin 22 is not limited to this configuration. A groove perpendicular to the axial direction may be provided on the shaft 21 around the shaft, and a member such as a snap ring may be fitted therein to prevent the stopper shaft 21 from coming off.

The shaft inside the collar 21a is a spring 20.
The spring 20 need not be the same diameter as the inside diameter of the
For example, as shown in FIG. 7, the spring 20 may be fixed by providing a projection 30 for preventing the spring 20 from coming off, as shown in FIG. Absent.

The contacts 3a and 3b are provided with depressions 3f and 3g for fixing the spring 20 and the retaining pin 22 around the hole 3c. Since it is sufficient that the spring 20 and the retaining pin 22 are fixed, the projection 20 is provided on the outer periphery of the place where the spring 20 and the retaining pin 22 come into contact, as shown in FIG. 8, for example. No problem.

[0019]

As is apparent from the above description, according to the present invention, a plate-like base, a pair of contacts arranged on both sides of the base, and one end of the pair of contacts are attached to the base. An elastic holding device that presses against both surfaces of the pair of contacts.The elastic holding device inserts a plate-shaped blade between the other ends of the pair of contacts narrower than the width of the blade so that the other end of the blade has the blade. A contact device that presses against both surfaces of the contact device, wherein the elastic holding device is provided at one end while being supported at one end while passing through the base and the pair of contacts and applying a contact pressure to the contact. A locking shaft for locking the spring with a provided collar, and a retaining member detachably attached to the other end of the retaining shaft to prevent the retaining shaft from coming off. Reduced number of parts and assembly It can be obtained contact device miniaturized with the easy.

Further, since the contact has a recess in which the spring fits, the contact for preventing the inclination of the stop shaft due to the slippage of the spring and supplying a stable contact pressure of the contact is provided. A device can be obtained.

Further, since the contact has a recess into which the retaining member fits, the stopper is prevented from tilting due to slippage of the retaining member, and a stable contact pressure of the contact is reduced. A contact device for feeding can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a configuration of a contact device according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a schematic front view showing a contact of the contact device according to Embodiment 1 of the present invention;

FIG. 4 is a schematic side view of the contact of FIG. 3;

FIG. 5 is a sectional view taken along the line CC of FIG. 4;

FIG. 6 is a side view showing a stop shaft of the contact device according to Embodiment 1 of the present invention.

FIG. 7 is a sectional view of a main part showing a configuration of a contact device in which a projection is provided on the outer periphery of a collar of a stop shaft.

FIG. 8 is a cross-sectional view of a main part showing a configuration of a contact device in which a projection is provided on an outer periphery of a contact portion of a contact with a spring or a retaining pin.

FIG. 9 is a schematic front view showing the configuration of a conventional contact device.

FIG. 10 is a sectional view taken along line DD in FIG. 9;

FIG. 11 shows a VCB to which a conventional contact device is attached.
It is a side view which shows the external appearance.

[Explanation of symbols]

1 Base, 2 blades, 3 pairs of contacts, 4 elastic holding device, 3a contact, 3b contact, 3c hole, 3d contact, 3e contact protrusion, 3f recess (for spring), 3g recess (retainer) For components), 20 springs, 2
1 Stop shaft, 21a Collar, 21b Pin hole, 22 Retaining pin (retaining member), 23 Elastic holding device.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hideo Nojiri 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5E086 CC24 DD10 DD45 LL04 LL07 LL12 LL14 LL16 LL17

Claims (3)

[Claims] 1. A plate-like base comprising: a plate-like base; a pair of contacts arranged on both sides of the base; and an elastic holding device for pressing one end of the pair of contacts against both surfaces of the base. A contact device wherein the elastic holding device presses the other end against both surfaces of the blade by inserting the blade between the other ends of the pair of contacts narrower than the blade. A holding device is a spring that contacts the contact and applies a contact pressure, a stop shaft that penetrates the base and the pair of contacts and supports the spring with a flange provided at one end, A contact member which is detachably attached to the other end of the stop shaft to prevent the stop shaft from coming off. 2. The contact device according to claim 1, wherein the contact has a recess in which the spring fits. 3. The contact according to claim 1, wherein the contact has a recess into which the retaining member fits.
A contact device according to claim 1.