JPH0328027B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a wiring duct plug used in a wiring duct in which a plug is connected at an arbitrary length position.

[Background technology]

Conventionally, the 14th to 16th plugs were used as plugs for wiring ducts.
There is one shown in the figure. This is the wiring duct 107
A contact 105 for branching the load current by contacting the conductor 109 of the load current is formed of a leaf spring.
As shown in FIG.
5a is fixed to a terminal block 110 inside the plug body 101, and by bending it with a cam 104 using this fixed part as a fulcrum, the tip protrudes from the plug body 101 and comes into contact with or separates from the conductor 109 of the wiring duct 107. or The contactor 105 contacts the conductor 109 as shown by the chain line in FIG. 15, and leaves as shown by the solid line.

A cam 104 is provided on a cam shaft 103 and rotated by a handle 102. As the handle 104 rotates, the fixing piece 106 also projects and rotates as shown in FIG. 14, and the plug body 101 is fixed to the wiring duct 107 with the lip portion 108 of the wiring duct 107 interposed therebetween.

However, this conventional example has the following problems.

Since the contactor 105 is formed of a leaf spring and is brought into contact with the conductor 109 of the wiring duct 102 with its spring pressure, it is difficult to obtain spring characteristics when making a large capacity plug. In order to increase the capacity, it is necessary to increase the cross-sectional area of the conductor 105 made of a leaf spring, but if the cross-sectional area becomes large, the spring property will be lost. In order to ensure springiness, a large structure is required, which poses difficulties in commercialization.

The material used for the contactor 105 must be a copper-based spring material with low electrical resistance and good conductivity in order to allow current to flow; however, in the case of non-ferrous copper alloy, it is generally more It has poor spring characteristics and is weak against heat. That is, it tends to become dull due to heat, and its springiness decreases.

The contact 105 is the conductor 10 of the wiring duct 102
Because the structure is such that the plug moves toward and away from the plug while facing the plug, if the plug is connected or removed while the load is still connected, the contact point will be easily damaged by arcing.
Reliability of contact area decreases. Further, if insulating foreign matter adheres to the surface of the contact portion, there is a problem that it is not removed and comes into contact with the contact portion.

In order to solve these problems, we considered a system in which the contactor is of a rotary type and the contact pressure is obtained using the contactor and another leaf spring. However, when the proximal end of the leaf spring, which presses against the contact at the tip, is embedded and fixed in the plug body, a large stress is applied to the spring fixing part of the plug body, which may cause the spring fixing part to deform due to long-term use. Characteristics change easily. If the embedded portion of the leaf spring is lengthened, changes in characteristics can be reduced, but the overall length of the leaf spring becomes longer, and the length of the plug increases accordingly.

[Purpose of the invention]

An object of the present invention is to provide a plug for a wiring duct which is small in size, has a large current capacity, and which is easy to obtain, and which allows reliable contact with the contacts.

[Disclosure of the invention]

In the wiring duct plug of the present invention, a rod-shaped contact is rotatably loosely fitted into a hole in a plug body, and as the contact rotates, the contact protrudes and retracts from the plug body, and is inserted into the wiring duct in a protruding state. Provide a plug blade in contact with the conductor. A means for rotating the contactor and a pressure spring for biasing the contactor in a direction in which the blade protrudes are provided. The pressure spring is provided with a pair of support pieces extending toward the tip of the pressure piece on both sides of the base end of the pressure piece in the form of a plate spring whose tip is pressed against the contact, and approximately the entire length of the support piece is Supported by the plug body.

According to this configuration, since the contact through which current flows and the pressure spring that applies contact pressure are constructed as separate members, it is possible to select the necessary materials for each of the contact and the pressure spring. The pressure spring has a pair of support pieces extending toward the tip of the pressure piece on both sides of the base end of a plate spring-shaped pressure piece whose tip is pressed against the contact, so that approximately the entire length of the support piece is By supporting the plug body with the plug body, it can be supported over a wide area. Therefore, even if the spring pressure is increased, there is no problem of change in spring characteristics due to deformation of the member supporting the pressure spring.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 13. As shown in FIG. 8, this wiring duct plug includes a plug body 1 that is partially inserted into an opening 3 along the longitudinal direction of the wiring duct 2, and a pair of levers for attaching and detaching the plug body 1. 4 is provided. The wiring duct 2 is connected to the lip part 2
The conductor 5 has a substantially groove shape with a diameter of 1.3 mm, and three conductors 5 are provided inside the conductor 5 exposed from the coating.

The plug main body 1 has a body 6, a cover 7 covering the lower surface of the body 6, and a head cover 8 provided above. As shown in FIG. 8C, contact blades 9a, 9a' protrude from both side surfaces and the top surface of the head cover 8, and these blades 9a, 9a' contact each conductor 5 of the wiring duct 2. A metal frame 10 is provided on the upper surface of the body 6 (see FIG. 9), and fixing rotary pieces 11 are attached to the metal frame 10 by fixed shafts 12 at both ends of the body 6. As shown in FIG. 8C, the plug body 1 is fixed to the wiring duct 2 by vertically sandwiching the lip portion 2a of the wiring duct 2 between the rotating fixing piece 11 and the metal frame 10.

FIG. 9 is an exploded perspective view of this wiring duct plug. The fixing rotary piece 11 is fixed by caulking or the like with the fixing shaft 12 via the metal frame 10, and the lever 4
Insert the gear portion 4a provided in the square shaft portion of the fixed shaft 12. Therefore, the lever 4 and the fixing rotating piece 11
and rotate together via a fixed shaft 12. The contacts 9, 9' provided with the plug blades 9a, 9a' are pipe-shaped, into which a lead wire 23 is inserted and crimped. These contacts 9 and 9' are provided with pressure springs 13 and 13, respectively.
13' as well as holes 15, 1 in the insulating frame 14.
Insert into 5'. The lower part of the insulating frame 14 fits into the long hole of the metal frame 10. A gear 16 is fitted to the lower ends of the two contacts 9 that protrude below the insulating frame 14. The relationship between the contactor 9 and the gear 16, the structure of the contactor 9, etc. will be explained later.

Cover the insulating frame 14 with the head cover 8,
These are fixed to the metal frame 10 with fixing screws 19. The plug blade 9a of the contactor 9 is inserted into the slit 20 formed between the head cover 8 and the insulating frame 14.
It is made to protrude so that it can be freely protruded and retracted by rotation.
The plug blade 9a' of the center contactor 9' is attached to the head cover 8.
protrude from the hole on the top surface of the

The metal frame 10 is fixed to the body 6 in a hugging state by the mounting piece portion 10a. The body 6 is open at the top and bottom, and has the gear 1 inside.
6, the gear portion 4a of the lever 4, and the terminal block 21 are housed. Three terminal boards 22 are arranged in each partition chamber of the terminal block 3, and lead wires 23 of the contacts 9, 9' are connected to the upper ends of these terminal boards 22 with terminal screws 24. The lead wire 23 is made of a flexible copper strand,
Absorbs the rotation of the contactor 9. An electric wire for taking out current is connected to the lower end of the terminal plate 22 by a terminal screw 25.

FIG. 10 is an enlarged sectional view of the main part. contact 9
The gear 16 fitted to the lower end of the gear 16 is prevented from coming off by a retaining ring 17. The gear 16 has a concave portion on its upper surface that is loosely fitted into the boss 27 of the insulating frame 14 so as to be freely rotatable. The contactor 9 has protrusions 28 on both sides of the lower end, and these protrusions 28 fit into the cross-shaped key groove 16 of the gear 16.
a (see Figure 9). Therefore, gear 1
When the contactor 6 is rotated, the contactor 9 is also rotated.

As shown in FIG. 3, the gear 16 meshes with the gear portion 4a of the lever 4, and by rotating the lever 4, the contact 9 also moves and rotates. The gear portion 4a of the lever 4 and the gear 16 constitute an interlocking mechanism 30.

The pair of levers 4 are rotatable in a range between an angle in which they mutually open outward and an angle in which they mutually protrude toward the same side surface of the plug body 1. The rotation range is restricted by a lever protrusion notch 3 formed in the body 6.
1 (see Figure 9). Fixing rotating piece 11
Interference with the insulating cover 14 is avoided by providing the notch 11a.

As shown in Fig. 1, the contact 9 has a hollow round shaft shape with a plug blade 9a at the tip, and a lead wire 23 (see Figs. 9 and 10) is crimped and fixed with a crimping tool. There is. The pressure spring 13 has a pressure piece 13a whose tip p is in pressure contact with the contact 9, and on both sides of the base end of the pressure piece 13a.
A pair of support pieces 13b are provided extending toward the tip end of the pressure piece, and the entire body is formed of a single plate spring. The hole 15 of the insulating frame 14 that accommodates the contactor 9 and the pressure spring 13 has a cross-sectional shape that is a combination of a round hole portion 15a and a convex portion 15b, as shown in FIG. The 11th
The pressure spring 13 is housed as shown in the figure. The support piece 13b of the pressure spring 13 is inserted into the narrow portion of the convex portion 15b, and the support piece 13b is supported over substantially the entire length by its inner wall. The contact 9 is inserted through the round shaft portion 15a.

The attachment and detachment of this wiring duct plug will be explained. When installing, as shown in FIG. 8A, the head cover 8 of the plug body 1 is inserted into the wiring duct 2 with the lever 4 protruding to the side. In this state, by rotating both levers 4 outward by approximately 90 degrees, the fixing rotating piece 11 directly connected to the lever 4 is turned sideways as shown in FIG. 3A.
Both ends thereof engage with the lip portion 2a of the wiring duct 2 (FIG. 8C). Therefore, the plug body 1 is fixed to the wiring duct 2. Also, lever 4 is gear 1
6, the contact 9 also rotates, and its plug blade 9a protrudes from the plug body 1 and comes into contact with the conductor 5 of the wiring duct 2.

To remove it, rotate the lever 4 toward the side of the plug body 1 in the opposite direction to the above. As a result, the fixing rotating piece 11 is oriented vertically as shown by the solid line in FIG. 7, and the plug blade 9a is retracted, allowing the plug body 1 to be pulled out.

Although attachment and detachment are performed in this way, the contact 9
It is loosely fitted into the hole 15 so as to be tilted by θ about the base end R against the force in the Q direction in the figure, and a contact pressure is applied by the pressure spring 13. The pressure spring 13 has a pair of support pieces 13 on both sides of the base end of a plate spring-shaped pressure piece 13a whose tip is in pressure contact with the contactor 9, and which extends toward the tip side of the pressure piece.
b, and the supporting piece 13b is the pressure piece 1.
Since it can be formed to have approximately the same length as 3a, the dimensions are stable and it can be supported over a wide area. Since the insulating frame 14 is supported over a large area, large stress does not concentrate on the insulating frame 14 made of a molded product.
The hole 15 of No. 4 will not be deformed. In this way, dimensional stability and prevention of deformation of the hole 15 are obtained, so there is no variation in the spring characteristics of the pressure spring 13,
Stable pressurization can be performed.

Since the support pieces 13b of the pressure spring 13 are provided on both sides of the pressure piece 13a, the overall length of the pressure spring 13 (FIG. 2B) can be shortened, and the plug can be made smaller. Although the width of the pressure spring 13 becomes wider, there is generally a dimensional margin in this direction, and there is no problem even if the width becomes wider.

In addition, since the contact 9 that conducts current and the pressure spring 13 that applies contact pressure are configured as separate members, the pressure spring 13 can be made of a highly reliable general iron-based material that does not require good conductivity. Spring materials can be used. Further, since the contactor 9 does not require spring properties, a copper material with good conductivity can be used, and the cross-sectional shape can be freely made large, so that a plug with a large current capacity can be easily manufactured.

Furthermore, since the contact 9 has a hollow shaft shape,
The lead wires 23 made of flexible copper strands can be easily connected by crimping.

〔Effect of the invention〕

In the wiring duct plug of the present invention, the contact element that conducts current and the pressure spring that applies contact pressure are constructed as separate members, so the pressure spring does not require good conductivity. Spring materials such as iron can be used. Further, since the contact does not require spring properties, a copper material with good conductivity can be used, and the cross-sectional shape can be freely made large, so that a plug with a large current capacity can be easily manufactured.

The pressure spring has a pair of support pieces extending toward the tip of the pressure piece on both sides of the base end of a plate spring-shaped pressure piece whose tip is pressed against the contact, so that approximately the entire length of the support piece is By supporting the plug body with the plug body, it can be supported over a wide area. Therefore, even if the spring pressure is increased, there is no problem of change in spring characteristics due to deformation of the member supporting the pressure spring, and stable support can be achieved. Since the support pieces are provided on both sides of the pressure piece,
The overall length of the pressure spring can be shortened, and the plug can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a contactor and a pressure spring according to an embodiment of the present invention, FIGS. 2A and B are a front view and a side view of the pressure spring, respectively, and FIGS. 3A and B are respectively Similarly, Fig. 4 is a side view of the same, Fig. 5 is a cutaway front view of the same, Fig. 6 is a side view of the same with the cover removed, and Fig. 7 is the same. Its broken plan view, Figure 8, is also an explanatory diagram of its installation process, Figure 9.
The figure is an exploded perspective view of the same, FIG. 10 is an enlarged sectional view thereof, FIG. 11 is a partially enlarged plan view thereof, and FIGS. 12 and 13 are a horizontal sectional view and a vertical sectional view, respectively, of the insulating cover. , 1st
Figure 4 is a front view of the conventional example, Figure 15 is its sectional view,
FIG. 16 is an exploded perspective view of the same. 1...Plug body, 2...Wiring duct, 4...
Lever, 9... Contact, 9a... Bungler, 10...
Metal frame, 11... Fixed rotation piece, 13...
Pressure spring, 13a...pressure piece, 13b...support piece, 14...insulation frame, 15...hole.

Claims (1)

[Claims] 1. A rod-shaped contact is rotatably fitted loosely into a hole in a plug body, and a plug blade is provided on the contact, which protrudes and retracts from the plug body as the contact rotates, and contacts the conductor of the wiring duct in a protruding state; A means for rotating the contact and a pressure spring for urging the contact in the direction of protrusion of the plug blade are provided, and the pressure spring is a pressure piece in the form of a leaf spring whose tip is pressed against the contact. A pair of support pieces are provided on both sides of the proximal end, extending toward the distal end side of the pressure piece.
A wiring duct plug in which substantially the entire length of this support piece is supported by the plug body.