JPH077619B2 - Rotary switch contacts - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a contact of a so-called rotary switch in which a movable contact comes into contact with a fixed contact by an arc motion about a shaft. .

(Prior Art) A conventional rotary switch is one in which a knife-type movable contactor is fitted into a female fixed contactor consisting of two contact pieces, and the movable contactor is clamped by the spring force of these contact pieces. is there.

On the other hand, in order to improve the electrical contact of the fixed contactor, a large number of contact pieces are arranged in a ring and spring springs are provided on the outer periphery of these contact pieces, and each contact piece is pressed in the central axis direction. A so-called tulip type fixed contactor,
There is also a switch in which a round bar-shaped movable contact is inserted into the annular contact piece by linear movement.

(Problems to be Solved by the Invention) In the rotary type switch, the female fixed contactor must hold the movable contactor during closing of the switch,
Therefore, this clamping force must be increased. On the other hand, when the clamping force is large, the operating force becomes large when the knife type movable contactor is inserted into and released from the female fixed contactor. Therefore, these adjustments are necessary for smooth loading and releasing, but this adjustment is extremely difficult.

In addition, a so-called tulip-shaped fixed contactor, in which the movable contactor is opened and closed by linear movement, has a structure in which one end of the movable contactor on the power supply side slides and rubs against the support and the electrical connection body. However, there is a drawback that the operating force at the time of opening becomes unnecessarily large.

(Means for Solving the Problems) Therefore, according to the present invention, a tulip-shaped fixed contactor and a rotary-type movable contactor are combined, and the movable contactor that performs an arc motion is a rigid body, and the fixed contactor is swingably supported. By doing so, it is possible to provide a contact for a switch, which can be operated very smoothly at the time of closing and opening.

Further, the specific configuration of the present invention is such that, with respect to the fixed contactor supported and connected to one electrode conductor of the switch, the movable contactor is provided at the other end of the arm whose one end is fixed to the shaft provided in the switch. The other electrode conductor of the container is connected to this movable contactor by a flexible conductor, and the movable contactor makes contact with and disengages from the fixed contactor by the pivotal movement of the arm around the shaft to make and open. In the switch, the fixed contact has a large number of contact pieces arranged in an annular shape on the outer circumference of a cylinder whose one end is closed, and spring springs are wound around the outer circumference of both ends of each contact piece protruding from both ends of the cylinder. The tip of one of the electrode conductors is press-fitted into the hollow portion from one end of the tubular contact piece, pressed against the closed end wall of the tubular body, and loosely penetrates the hole formed in the closed end wall to end face the electrode conductor. Has a bolt head with a larger diameter than the hole A bolt is planted to swingably support the fixed contact at the tip of the electrode conductor, and a cover cylinder is covered on the outer circumference of the fixed contact, and the movable contact is a cylindrical shape of the fixed contact. It is a round bar that can be freely inserted into the contact piece.

(Function) To open the switch from the open state, when the shaft is rotated, the arm is rotated, and the movable contact enters the hollow portion of the cylindrical contact piece of the fixed contact, and a large number of contact pieces. The inner circumference of the pressure contact the outer circumference of the movable contact. This movable contact is inserted into the hollow part of the fixed contact by an arc motion. At that time, since the fixed contact is swingably supported by the tip of the electrode conductor, the fixed contact is inserted in the insertion direction of the movable contact. When the child moves and the tip of the movable contact hits one end of the fixed contact, the neck is lowered with respect to the supported electrode conductor, and the neck moves as the movable contact enters the hollow part of the fixed contact. It will be in a state of raising. Also, when the switch is released from the closed state, the fixed contact oscillates in accordance with the movable contact.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an open state of a switch using the present invention, where 1 is a box-shaped switch body, 2 is a bushing provided on one side of the switch body 1, and the bushing 2 is One end penetrates one side of the switch body 1 and projects in and out of the switch body 1. 3 is a packing provided on the outer periphery of the bushing 2 and the inner periphery of the through hole of the switch body 1, 4 is an O-ring provided on the outer periphery of the packing 3, and 5 is an electrode conductor passing through the bushing 2. , This electrode conductor 5
In the switch body 1, a round bar-shaped projecting end 5a projects from the tip of the bushing 2. Reference numeral 6 denotes a fixed contact which is swingably supported by the round bar-shaped protruding end 5a. The fixed contact 6 is provided on the outer periphery of a cylindrical body 7 having a closed end wall 7a at one end as shown in FIG. A large number of contact pieces 8 are arranged in parallel to the axial direction of the body 7, and the projections 8a on the inner circumference of each contact piece 8 are fitted into the small holes 7b formed on the outer circumference of the cylinder 7 so that both ends of the cylinder 7 are outward. Each protruding contact piece 8
Spring springs 9 are wound around the outer circumferences of both ends, and the projecting end portion 5a of the electrode conductor 5 is press-fitted into the hollow portion at one end of the cylindrical contact piece 8 and the end surface of the projecting end portion 5a is closed. The bolt 10 is applied to the end wall 7a, and the bolt 10 is inserted from the hollow portion of the other end of the contact piece 8 to loosely penetrate the hole 11 formed in the closed end wall 7a of the cylindrical body 7 to plant the bolt 10 on the end surface of the projecting end 5a. A spring washer 12 having a smaller diameter than the hole 11 and a washer 13 having a larger diameter than the hole 11 are provided between the head of the bolt 10 and the end surface of the projecting end 5a. Therefore, there is a gap between the closed end wall 7a of the cylindrical body 7 and the washer 13.

The inner circumference of each of the contact pieces 8 and the outer circumference of the projection 5a of the electrode conductor 5 have a certain contact length in the axial direction as shown in FIGS. Since the spring spring 8 is wound around, the fixed contact 6 is swingably supported with respect to the electrode conductor 5, but is always oriented in the axial direction of the electrode conductor 5. Reference numeral 14 denotes a tubular cover that covers the outer circumference of the fixed contactor 6, and the inner diameter of the tubular cover 14 is slightly larger than the outer diameter of the tubular contact piece 8 of the fixed contactor 6. An inner peripheral edge 14a is provided at one end of the cylindrical cover 14 and at a position contacting the end of the bushing 2. The inner peripheral diameter of the inner peripheral edge 14a is larger than the outer diameter of the projecting end 5a of the electrode conductor 5. . Reference numeral 15 is an annular cushioning material interposed between the inner peripheral edge 14a of the cylindrical cover 14 and one end of the contact piece 8.

16 is a bushing provided in the switch body 1, 17 is a connecting conductor supported by the bushing 16, 18 is a shaft provided in the switch body 1, 19 is a movable arm whose one end is fixed to the shaft 18, and 20 is this The movable contactor 20 is a round bar-shaped movable contactor provided at the tip of the movable arm 19, and the movable contactor 20 can contact the fixed contactor 6. The tip of the round bar-shaped movable contactor 20 has an end face cut by the upper surface of the radiation 18 of the shaft 18, as shown in FIG. Reference numeral 21 is a guide made of an insulating material provided at the tip of the movable contact 20. Reference numeral 22 is a flexible conductor connecting the movable contact 20 and the connecting conductor 17, and 23 is a packing provided on the inner circumference of the through hole between the bushing 16 and the switch body 1.

In the case of this embodiment, when the shaft 18 is turned counterclockwise in FIG. 1 from the outside of the switch main body 1 by a handle (not shown) or the like, the movable arm 19 rotates and the guide 21 at the tip of the movable contact 20. Comes into contact with the contact piece 8 of the fixed contact 6, the guide 21 enters the hollow portion of the cylindrical contact piece 8, and the tip of the fixed contact 6 moves toward the guide 21 as shown in FIG. Then, the end of the movable contact 20 behind the guide 21 contacts the contact piece 8 of the fixed contact 6, but at this time, since the end face of the movable contact 20 coincides with the radiation upper surface of the shaft 18 as described above, the movable contact Child
The outer circumference of the end of 20 simultaneously contacts all of the contact pieces 8 of the fixed contactor 6. Further, since the movable contactor 20 enters the inner part of the fixed contactor 6 by an arc motion, the tip of the fixed contactor 6 swings in accordance with the movement of the movable contactor 20. Then, as shown in FIG. 4, the outer periphery of the movable contactor 20 is clamped by the force of the spring 9 between the inner periphery of each of the cylindrical contact pieces 8 and electrically connected.

When the shaft 18 is rotated clockwise from this closed state, the movable contact 20 is separated from all the contact pieces 8 of the fixed contact 6 at the same time, and the tips of the fixed contact 6 follow the movements of the movable contact 20 and the guide 21. Moves. And these movable contacts
When the 20 and the guide 21 are disengaged from the fixed contact 6, the fixed contact 6 is directed to the axial extension line of the electrode conductor 5 by the force of the spring 9 of the fixed contact 6 capped on the projecting end 5a of the electrode conductor 5. .

The cylindrical cover 14 prevents the fixed contacts 6 from collapsing when the fixed contacts 6 swing.

Further, as described above, in the above embodiment, when the movable contact 20 is separated from the fixed contact 6, the fixed contact 6 faces the axial extension line of the electrode conductor 5, but this is made more reliable. Therefore, a spring spring is interposed between the washer 13 of the fixed contact 6 and the closed end wall 7a of the cylindrical body 7,
The restoring force when the fixed contact 6 swings can be made stronger.

(Effects of the Invention) The present invention has the above-described configuration. For the contact between the movable contact and the fixed contact, the fixed contact is configured by forming a plurality of contact pieces into a tubular shape, and the fixed contact The inner circumference of the contact piece presses the outer circumference of the movable contact by the force of the spring spring wound around the outer circumference of the contact piece. Therefore, the electrical connection between the fixed contact and the movable contact is extremely good. In addition, because the fixed contact swings in accordance with the circular motion of the movable contact that is a rigid body,
The opening and closing of the switch requires only a small amount of operating force for smooth opening and closing.

Further, since the contactor of the present invention is a rotary switch, the stroke length of the movable contactor can be shortened and the switch can be downsized as a whole.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a vertical sectional view showing an open state of a switch using the present invention, FIG. 2 is an enlarged sectional view of a fixed contact of the present invention, and FIG. FIG. 4 is an enlarged sectional view showing a state where the movable contactor starts to contact the fixed contactor of the present invention, and FIG. 4 is a longitudinal sectional view showing a closed state of the switch using the present invention. In the figure, 1 is a switch body, 2 is a bushing, 5 is an electrode conductor, 6 is a fixed contact, 7 is a cylindrical body, 8 is a contact piece, 9 is a spring spring, 10 is a bolt, 11 is a hole, and 13 is a washer. ,14
Is a cylindrical cover, 17 is a connecting conductor, 18 is a shaft, 19 is a movable arm, and 20 is a movable contact.

Claims (1)

[Claims] 1. A rotary switch in which a movable contact comes into contact with a fixed contact by an arc motion, wherein the fixed contact has a large number of contact pieces arranged in an annular shape on the outer periphery of a cylindrical body having one end closed. Spring springs are wound around the outer circumferences of the contact pieces protruding from both ends of the tubular body, and one end of the electrode conductor fixed to the switch is press-fitted into the hollow portion from one end of the tubular contact piece to close the tubular body. Pressing against the end wall, loosely penetrating the hole formed in the closed end wall of the cylinder body, and planting a bolt having a bolt head with a larger diameter than the hole on the end face of the electrode conductor, and attaching this fixed contact to the electrode. The tip of the conductor is swingably supported, and the outer circumference of the fixed contact is covered with a cover cylinder, and the movable contact is a round bar that can be fitted into the cylindrical contact piece of the fixed contact. Contactor characterized by.