JPH0878082A - Electric power supplying pin - Google Patents

Abstract

PURPOSE: To make an electric power supplying pin durable for long time use independently of fields of such as light electric appliances, strong electric appliances, etc., by making a ball of a non-conductive material and at the same time installing a non-conductive spring in the inside of a case and making the spring electrically shielded from a contact pin and the case. CONSTITUTION: Regarding an electricity supplying pin 1, when a contact pin 4 is pressed by a contact 2 on the opposite side, a sliding part 40 of the pin 4 is slider backward while being brought into contact with the inner face of the case 3. At that time, the pin 4 and the contact 2 are put in a state wherein the pin and the contact 2 are brought into contact at a constant pressure by the assistance of a spring 5. Though electric current from the contact 2 flows to a cable 11 after passing the pin 4, the case 3, a bus bar 9, and a press-bonded terminal 10, the current does not flow in the spring 5 since a non-conductive ball 6 is put between the pin 4 and the spring 5 and a spring surrounding material 8 is put between the case 3 and the spring 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply pin for flowing an electric current in an automatic tool changer or the like for contact with a contact on the other side which is moving away from or approaching the contact.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a contact pin 4 that contacts the inner surface of the case 3 is slidably provided at the tip of the case 3, and a conductive ball 6'is provided inside the case 3.
A power supply pin having a spring 5 for urging the contact pin 4 via the power supply pin has been used.

This conventional power supply pin is a contact pin 4
Contacting the mating contact 2 causes the cable
Although a current is made to flow to 11, there are two current paths, a path passing from the contact pin 4 to the case 3 and a path passing from the contact pin 4 to the ball 6 ′ and the spring 5.

Of these, the contact pin 4 to the ball 6 '
And the path through the spring 5 does not cause much problem when used in a weak electric field where only a small current flows,
In the case of use in a high electric field where a large current of 100 amperes or more flows, there is a high possibility that the balls 6 ′ and the springs 5 will be melted by resistance heat and will be welded to the inner surface of the case 3 or the like.
Also, contact pins 4, balls 6 ', springs 5
Then, conductive wear powder is generated by contact with the inner surface of the case 3, and there is a high possibility that the balls 6 ′ and the spring 5 are welded to the inner surface of the case 3 and the like by the wear powder melted by resistance heat.

When such welding occurs, the contact pin 4 cannot smoothly come in and out, and an appropriate contact pressure between the contact pin 4 and the mating contact 2 cannot be obtained. In other words, this conventional power supply pin has a problem that it cannot be expected to have a long life when it is used in the field of high power.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention
An object of the present invention is to provide a power supply pin that can be used for a long period of time regardless of the fields of low power and high power.

[0007]

In order to solve the above-mentioned problems, the present invention takes the following technical means.

In the power feeding pin of the present invention, a contact pin that comes into contact with the inner surface of the case is slidably provided at the tip of the conductive case, and a spring that biases the contact pin via a ball is provided inside the case. In the feeding pin, the ball is made of a non-conductive material and a non-conductive spring enclosing material is provided inside the case so that the spring is electrically isolated from the contact pin and the case.

Further, a non-conductive cylindrical portion may be provided inside the case so that the balls are closely fitted in the cylindrical portion so as to be movable.

[0010]

As a result of adopting the above means, the present invention has the following effects.

In the power supply pin of the present invention, current flows from the contact pin through the case, but a non-conductive ball is interposed between the contact pin and the spring, and the case is surrounded by the non-conductive spring. Since the material is provided, the spring is electrically isolated from the contact pin and the case. Therefore, since the electric current does not pass through the ball and the spring, it is unlikely that the ball and the spring are melted by the resistance heat and adhered to the inner surface of the case or the like.

Further, if a non-conductive cylindrical portion is provided inside the case and the balls are tightly fitted in the cylindrical portion so as to be movable, conductive abrasion powder is generated by contact between the contact pin and the inner surface of the case. However, since there is almost no gap between the ball and the cylindrical portion, the wear powder does not reach the area where the spring is disposed, and the spring or ball is formed by the wear powder melted by the resistance heat to the current. It is possible to prevent the welding to the inner surface of the case or the like.
Further, even if the balls slide in the cylindrical portion to generate abrasion powder, since the abrasion powder is non-conductive, it does not melt due to resistance heat and causes the welding of springs and balls. Does not mean

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a power supply pin 1 of an embodiment of the present invention in contact with a mating contact 2. The power feeding pin 1 has a slightly smaller diameter hole formed in the end surface of the conductive cylindrical case 3, and the tip of the contact pin 4 projects from this hole.

The contact pin 4 has a sliding portion 40 having a diameter substantially the same as the inner diameter of the case 3, and the sliding portion 40 makes contact with the inner surface of the case 3 in the front-back direction (left-right direction in the drawing).
It can be slid on. Since the sliding portion 40 has a diameter larger than that of the hole, it also serves to prevent the contact pin 4 from coming off the case 3.

Inside the case 3, the contact pin 4
A spring 5 and a non-conductive ball 6 are housed in the rear area of the contact pin 4, and the contact pin 4 is biased by the spring 5 via the ball 6 in a direction projecting from the case 3.

The ball 6 contacts the inner surface of a non-conductive cylindrical portion 7 provided on the inner surface of the case 3 with almost no space, and is movable in the cylindrical portion 7. Considering that the contact pin 4 can be smoothly moved in and out, it is preferable to adopt a slide bearing for the cylindrical portion 7.

Further, inside the case 3, a non-conductive spring enclosing material 8 is provided continuously with the cylindrical portion 7. The spring enclosing member 8 is for preventing the spring 5 from coming into contact with the inner surface of the case 3, and is formed in a cylindrical shape like the cylindrical portion 7.

The cylindrical portion 7 and the spring enclosing material 8 are
It is desirable to use one having a small sliding resistance so as not to hinder the operation of the ball 6 and the spring 5.

In this power feeding pin 1, when the contact pin 4 is pressed by the mating contact 2, the sliding portion 40 of the contact pin 4 slides rearward in contact with the inner surface of the case 3. At this time, the contact pin 4 and the mating contact 2 are in contact with each other at a constant contact pressure due to the bias of the spring 5.

The current from the mating contact 2 flows to the cable 11 through the contact pin 4, the case 3, the booth bar 9 and the crimp terminal 10, but a non-conductive ball 6 is provided between the contact pin 4 and the spring 5. But then case 3
Since the non-conductive spring enclosing material 8 is interposed between the spring 5 and the spring 5, no current flows through the spring 5.

Therefore, in the conventional power feeding pin 1, the ball 6 '
Even when a large current is applied to the or spring 5 such that it melts due to resistance heat, no current flows through the ball 6 and the spring 5 in the power supply pin 1, so that they do not melt.

Further, in the conventional power feeding pin 1, the conductive abrasion powder generated by the contact pin 4 sliding on the inner surface of the case 3 causes the welding of the spring 5 and the inner surface of the case 3. In the power supply pin 1, even if the abrasion powder is generated, since there is almost no gap between the ball 6 and the cylindrical portion 7, the abrasion powder does not reach the area where the spring 5 is arranged. ing.

Moreover, even if the ball 6 slides in the cylindrical portion 7, the inner surface of the cylindrical portion 7 has a small sliding resistance and is less likely to generate abrasion powder, and even if abrasion powder is generated, it is non-conductive. Therefore, it does not melt due to resistance heat against a large current,
It does not cause the welding of the spring 5 and the ball 6.

The power supply pin 1 of the present invention is connected to the first unit U1 connected to the robot R as shown in FIG.
It can be used in an automatic tool changer in which a second unit U2, to which various tools can be attached, is detachably connected.

As shown in FIG. 3, in this automatic tool changer, the power feed pin 1 is provided on the side portion of the second unit U2, and the mating contact 2 is provided on the side portion of the first unit U1. At this time, the contact pin of the power supply pin 1 comes into contact with the contact 2 on the other side, and the tool is operated by receiving the supply of electric current.

[0027]

Since the power supply pin of the present invention has the above-mentioned structure, the current does not pass through the balls or springs even when a large current flows, and the balls or springs are melted by resistance heat and the inner surface of the case or the like. Unlikely to be welded to.
Therefore, it can be used for a long period of time regardless of the fields of weak electric power and strong electric power.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a power supply pin according to the present invention.

FIG. 2 is a perspective view of an automatic tool changer using an embodiment of a power feeding pin according to the present invention.

FIG. 3 is a first unit and a second unit of the automatic tool changer.
The perspective view which shows a unit.

FIG. 4 is a cross-sectional view of a conventional power supply pin.

[Explanation of symbols]

 1 Power supply pin 3 Case 4 Contact pin 5 Spring 6 Ball 7 Cylindrical part 8 Spring enclosing material

Claims (2)

[Claims] 1. A power supply pin comprising: a conductive case; a contact pin slidably provided on the tip of the conductive case; and a spring for urging the contact pin via a ball. A feed pin, characterized in that the ball is made of a non-conductive material, a non-conductive spring enclosing material is provided inside the case, and the spring is electrically isolated from the contact pin and the case. 2. A non-conductive cylindrical portion is provided inside the case,
The power supply pin according to claim 1, wherein the ball is tightly fitted in the cylindrical portion so as to be movable.