JPH10134859A - Terminal device of electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guide a male screw to the screw hole of a fixed terminal surely by inserting the guide plate portion of an inverted L-shaped washer into a terminal containing portion, causing to hold the guide plate portion in a guide slit provided in the terminal containing portion. SOLUTION: When a terminal screw is fitted to a terminal containing portion 3, the flexible piece 1b of a cover 1 is fitted into the cutout 3k of the terminal containing portion 3, and the protrusion portion 1a of the flexible piece 1b is positioned in a guide slit 3m provided in the terminal containing portion. The guide plate portion 20 of the inverted L-shaped washer 2a of a terminal screw 2 is inserted into the guide slit 3m of the terminal containing portion 3 from above. The thin portion 2c and the thick portion 2b of the guide plate portion 20 are respectively thrust downward as guided by the longitudinal slit of the guide slit 3m and a guide wall 3p. Then, the protrusion portion 1a of the flexible piece 1b is fitted into the recessed portion of the guide plate portion 20. Since the terminal screw 2 is held so that the tip of a male screw 2n has a certain spacing from a fixed terminal in a state where the guide plate portion 20 is guided by the guide slit 3m, the falling-off of the terminal screw 2 can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device of an electric device which can easily connect an end of a conductive material such as a round crimp terminal without removing a terminal screw from a fixed terminal plate.

[0002]

2. Description of the Related Art In general, a terminal device for connecting an electric wire, which is incorporated in an electric device such as an electromagnetic contactor or an electromagnetic switch, has a fixed terminal plate having a screw hole and a male screw connected to the terminal plate. The wiring is connected to the electric device by tightening the male screw with the wiring end inserted between the washer and the washer supported by the washer. When connecting an electric wire in which a round crimp terminal having a round hole is fixed to the terminal to this terminal device, remove the screwed male screw from the fixed terminal plate and fit the hole of the round crimp terminal into this male screw. After that, the male screw had to be screwed into the screw hole of the fixed terminal plate again. This work requires time and effort to remove the male screw once screwed into the fixed terminal board, and there is a high possibility that the male screw will be dropped due to a work error, and it will take time to search for and pick up the dropped male screw. In some cases, the connection work efficiency was reduced. For this purpose, several terminal devices for electric equipment with improved connection work efficiency have been proposed.

FIG. 9 is a cross-sectional view schematically showing a main part of a terminal device of a conventional electric device having improved connection work efficiency described in Japanese Patent Application Laid-Open No. Sho 60-130068. In the figure, a fixed terminal 13 fixed to a frame side made of an insulating material of a terminal device has a screw hole 13a.
The male screw 12 to be screw-coupled to the female screw 12 is provided with a washer 12a rotatably and loosely supported at a constricted portion near the head thereof. Further, the terminal cover 11 for preventing electric shock, which covers the terminal device from above, has a round hole 11h into which a screwdriver for tightening and loosening and returning the male screw 12 is inserted. Further, a flexible holding piece 11 that engages with the lower surface of the head of the male screw 12 and supports the male screw 12 is provided below the round hole 11h.
a is formed, and is shipped in a state where the distance between the tip of the male screw 12 and the screw hole 13a is maintained. At the time of connection, the male screw 12 is pushed down and tightened after the round hole of the round crimp terminal is fitted into the end of the male screw 12 without loosening the male screw as described above.

FIG. 10 is a front view of a main part of a terminal device showing a different conventional example described in Japanese Patent Publication No. 4-4707, and FIG. 11 is a perspective view showing the shape of the terminal screw. In the figure, this terminal device is a frame 2 made of an insulating material.
A fixed terminal 17 having a screw hole 17a fixed to 1;
It comprises a male screw 16 screwed into the screw hole 17a and a terminal screw made of an inverted L-shaped washer rotatably supported by a constricted portion near the head of the male screw.

As shown in FIG. 11B, the inverted L-shaped washer 15 has an inverted L-shape including a washer through which a male screw passes and a vertical portion, and a bent portion 15a is formed at the lower end of the vertical portion. Is formed. This vertical portion engages with the guide groove 21a formed on the frame 21 side of FIG. 10 to guide the male screw 16 so as to be able to move up and down.
7 can be screwed into the screw hole 17a and then loosened back. A leaf spring 18 is provided below the fixed terminal 17, and when the tip of the leaf spring 18 is engaged with the bent portion 15a of the inverted L-shaped washer 15, the tip of the male screw 16 is separated from the screw hole 17a and held. You. In this state, the crimping terminal 31 is inserted into the tip of the male screw 16, and then the male screw 16 is pushed down and the male screw 16 is tightened, so that the electric wires can be connected without loosening and returning the male screw 16. Can be.

[0006]

However, in the terminal device shown in FIG. 9, the direction of the tip of the male screw is not fixed when the male screw comes off the holding piece when the male screw is tightened or after the male screw comes off. It was difficult to screw the tip of the male screw into the screw hole 13a. Further, when the electric wire is pulled in a state where the male screw is inserted into the round hole of the round crimp terminal, there is a possibility that the male screw falls off from the holding piece. Further, when attaching and detaching the wiring and additionally connecting the round crimp terminal, it is necessary to remove the terminal cover, and the operation is complicated.

The terminal device shown in FIG. 10 is designed to reduce wiring man-hours and prevent screws from being lost. However, a leaf spring is used to hold the inverted L-shaped washer at the upper portion, and the number of parts increases. There is a disadvantage that. In addition, since the vertical portion of the inverted L-shaped washer cannot move in the direction perpendicular to the plane of the drawing due to the guide groove 21a of the frame 21, when wires having different wire diameters are simultaneously connected to both sides of the male screw with a normal screw tightening force. The washer did not tilt, and the tightening force on thin wires was weak. Further, if a single wire is inserted into one side of the terminal screw and the screw is strongly tightened, the connecting portion between the washer portion of the inverted L-shaped washer and the vertical portion is deformed and cannot be reused.

SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal device of an electric device which can surely guide a male screw into a screw hole of a fixed terminal without increasing the number of parts and can surely perform parallel connection of different wire diameters. It is in.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a terminal device of an electric device for connecting a round crimp terminal or the like to a fixed terminal having a screw hole fixed to a terminal accommodating portion of a frame partitioned by an insulating wall. A terminal screw comprising a male screw whose tip is coupled to the screw hole, and an inverted L-shaped washer rotatably held by the male screw and having a guide plate part bent to the fixed terminal side. The guide plate portion of the inverted L-shaped washer is inserted into the terminal accommodating portion, and guides the vertical movement of the guide plate portion, and when the tip of the male screw is connected to the fixed terminal, the guide plate portion of the guide plate portion is A guide groove for releasing the guide is formed, and an engaging portion for holding a guide plate portion guided by the guide groove so that the tip of the male screw has a fixed interval with the fixed terminal is formed by the inverted L-shape. Form on the guide plate part of the washer and the guide groove side It is intended to.

According to a second aspect of the present invention, in the terminal device for an electric device described above, the guide plate portion of the inverted L-shaped washer is formed as a thick portion at the center and as a thin portion on both sides, and the guide groove is formed as the guide groove. It comprises a vertical groove for guiding the thickness direction of the thin portion and a guide wall for guiding the width direction of the thick portion.

According to a third aspect of the present invention, in the terminal device for an electric device described above, the guide groove is formed as a vertical groove for guiding a thickness direction and a width direction of the guide plate portion of the inverted L-shaped washer. .

According to a fourth aspect of the present invention, in the terminal device for an electric device described above, a notch is formed in the terminal accommodating portion so as to be continuous with the guide groove, and a flexible bending piece fitted in the notch is provided with the guide groove. It forms an engaging portion.

According to a fifth aspect of the present invention, there is provided the terminal device for electrical equipment according to the fourth aspect, further comprising a cover attached to the frame, wherein the cover is provided with the flexible bending piece.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a terminal device for electrical equipment for connecting a round crimping terminal or the like to a fixed terminal having a screw hole fixed to a terminal receiving portion of a frame partitioned by an insulating wall. A terminal screw comprising a male screw having a leading end coupled to the hole, and an inverted L-shaped washer rotatably held by the male screw and having a guide plate portion having one bent toward the fixed terminal side; The guide plate portion of the inverted L-shaped washer is inserted into the portion, to guide the vertical movement of the guide plate portion, and to guide the guide plate portion in a state where the tip of the male screw is connected to the fixed terminal. A guide groove to be released is formed, and an engaging portion for holding a guide plate portion guided by the guide groove so that the tip of the male screw has a certain interval between the male terminal and the fixed terminal is formed by the reverse L-shaped washer. Formed on the guide plate and the guide groove side It is.

[0015]

1 to 8 show an embodiment of the present invention, which will be described below. Embodiment 1 FIG. 3 is an exploded perspective view of a terminal device of an electric apparatus showing an embodiment of the present invention. This terminal device has a plurality of terminal accommodating portions 3 separated by insulating walls.
a, a terminal screw 2 attached to the terminal accommodating portion 3 of the frame 5, a claw 1g engaged with the engaging hole 5a, and a flexure 1b protruding toward the terminal accommodating portion 3. And a cover 1 having the same. The cover 1 is attached to the frame 5 by engaging the claws 1g with the engagement holes 5a of the frame 5. Further, a fixed terminal having a screw hole is fixed to the terminal accommodating portion 3.

FIG. 1 is a block diagram showing the structure of a main part of the present invention.
2 is a perspective view showing the terminal screw 2 of FIG. 1. In the figure, a terminal screw 2 includes a male screw 2n provided with a spring washer (not shown), a guide plate portion 20 having a thick portion 2b at the center and a thin portion 2c formed by crushing both sides, and a male screw 2n. The male screw 2n is rotatably attached to the inverted L-shaped washer 2a. As shown in FIG. 2, an arc-shaped concave portion (engaging portion) 2 h is provided on the back surface of the guide plate portion 20, and the concave portion of the guide plate portion 20 is provided on the flexible piece 1 b of the cover 1. An arc-shaped convex portion (engaging portion) 1a engaging with 2h is provided. Here, the positions of the concave portion 2h formed on the guide plate portion 20 and the convex portion 1b formed on the flexible piece 1b of the cover 1 are determined by the male screw of the terminal screw when the convex portion 1b and the concave portion 2h are fitted. Is set so that a space is provided between the tip of the fixed terminal and the fixed terminal. Further, in the terminal accommodating part 3,
A guide groove 3 into which the guide plate 20 of the inverted L-shaped washer 2a is inserted to guide the vertical movement of the guide plate 20.
A notch 3k into which the m and the flexible piece 1b of the cover 1 fit is formed. The guide groove 3m includes a vertical groove for guiding the thickness direction of the thin portion 2c of the guide plate portion 20 of the inverted L-shaped washer and a guide wall 3p for guiding the width direction of the thick portion 2b. A taper wider than the width direction of the thick portion 2b is provided below the guide wall 3p so that the guide of the guide plate portion 20 is released at the position where the electric wire is tightened.

In such a configuration, to attach the terminal screw 2 to the terminal accommodating portion 3, first, the flexible piece 1b of the cover 1 is fitted into the notch 3k of the terminal accommodating portion 3, and the convex portion 1a of the flexible piece 1b is fitted. Is located in the guide groove 3m. Then, the guide plate portion 20 of the inverted L-shaped washer 2a of the terminal screw 2 is inserted into the guide groove 3m of the terminal accommodating portion 3 from above, and the thin portion 2c and the thick portion 2b of the guide plate portion 20 are respectively inserted into the guide grooves 3m. When guided downward by the vertical groove and the guide wall 3p, the concave portion 2h of the guide plate portion 20 is fitted with the convex portion 1a of the flexible piece 1b.

FIG. 4 is a partial cross-sectional side view of the terminal device showing the fitted state. In a state where the concave portion 2h of the inverted L-shaped washer 2a of the terminal screw 2 and the convex portion 1a of the flexible piece 1b are fitted, a gap is maintained between the tip of the male screw 2n of the terminal screw 2 and a fixed terminal (not shown). And shipped to the customer in this state.

FIGS. 5A and 5B are cross-sectional views showing a state in which a round crimp terminal with an electric wire is connected to the terminal device of the present invention. FIG. 5A is a state in which the round crimp terminal is inserted, and FIG. The state (c) is a state where the connection of the round crimp terminal is completed. First, the tip of the male screw 2n and the fixed terminal 3n in the state of FIG.
The round crimp terminal 31 is inserted between the terminals [FIG.
In this state, when the head of the male screw 2n is pressed down with a screwdriver or the like, the concave portion of the guide plate portion 20 and the convex portion 1a of the bending piece 1b are pressed.
The guide plate 20 is guided by the guide groove 3m and moves downward while bending the flexible piece 1b while the distal end of the male screw 2n is guided toward the screw hole of the fixed terminal 3n. [Figure (b)]. In this state, the bending piece 1b
And the washer bent portion of the inverted L-shaped washer 2a are in contact with each other, and the terminal screw 2 does not rise unless force is applied in the direction opposite to the tightening direction of the male screw 2n. There is no gap between 3n and round crimp terminal 31
Can be temporarily stopped. Further, when the male screw 2n is tightened, the round crimp terminal 31 is pressed and fixed between the fixed terminal 3n and the inverted L-shaped washer 2a [FIG.

When the round crimp terminal 31 is to be removed from the connection completed state shown in FIG. 3C by changing the wiring or the like, the male screw 2n is loosened and the tip of the horizontal portion of the inverted L-shaped washer is lowered. Then, it is lifted by a tool such as a screwdriver, and is pulled up to a position where the concave portion of the guide plate portion 20 engages with the convex portion of the flexible piece 1b, that is, the state shown in FIG. 3A, and then the round crimp terminal is pulled out.

FIG. 6 is a sectional view of a main part of the terminal device showing the holding state of the terminal screw shown in FIG.
n is a diagram showing a state in which an inverted L-shaped washer having n is inserted into a guide groove;
(B) is a state diagram in which only the inverted L-shaped washer was inserted into the guide groove. In (b), the side surface of the thin portion 2c is inserted into the vertical groove of the guide groove 3m, and both sides of the thick portion 2b are restricted by the guide wall 3p. Since the male screw 2n is pushed down just below, the tip of the male screw 2n can be surely guided to the screw hole of the fixed terminal 3n.

FIGS. 7A and 7B are cross-sectional views of a main part of a terminal device according to the present invention, in which electric wires having different wire diameters are connected in parallel to both sides of a male screw, showing the completion of tightening. FIG. 7A is an inverted L-shaped washer having a male screw. (B) is an insertion state diagram showing only an inverted L-shaped washer. In the figure, a thin electric wire 35 and a thick electric wire 36
Is inserted into both sides of the male screw 2n and the terminal screw is pressed down, the guide plate portion of the inverted L-shaped washer 2a is released from the guide of the guide groove 3m as shown in FIG.
The horizontal part of the electric wire 3 is inclined, and the lower surface of the horizontal part is linear.
It is stabilized at the position where it contacts both 5 and 36. This is because the shape of the guide groove 3m is formed such that a taper is formed in the guide wall 3p in order to prevent both sides of the thick portion 2b of the guide plate portion from contacting, and both sides of the thin portion 2c of the guide plate portion contact. This is because a space portion is formed below a part of the guide wall in the vertical groove of the guide groove 3m in order to prevent the above.

It should be noted that in the above-described embodiment, two lines having different linear shapes are used.
Although the case of connecting two electric wires has been shown, the inclination of the inverted L-shaped washer 2a similarly occurs when one electric wire is connected, so that the electric wire can be securely fixed.

Embodiment 2 FIGS. 8A and 8B show another embodiment of the present invention. FIG. 8A is an exploded perspective view of a terminal device, and FIG. 8B is a partial perspective view of a terminal screw 8. In the terminal device of this embodiment, the guide plate 80 is formed with the distal end formed as a narrow portion 8s, and the engaging portion of the guide plate 80 is formed with a concave groove 8h.
A terminal screw 8 having a V-shaped washer 8a, a cover 7 in which an engaging portion formed on a flexible flexure 7b is a ridge 7a engaging with the concave groove 8h, and a guide plate 80. Vertical groove and inverted L-shaped washer 8a for guiding in the thickness direction and the width direction
9m consisting of a guide wall 9p that guides the details 8t
And a terminal accommodating portion 9 provided with a notch 9k into which the bending piece 7b is fitted. The guide groove 9
m is tapered below the guide wall 9p so that the guide of the guide plate portion 80 is released at the position where the electric wire is fastened to the inverted L-shaped washer, and is tapered below the partial guide wall in the vertical groove. Is provided with a space wider than the width direction of the guide plate portion. The other configuration is the same as that of the first embodiment, and the description thereof is omitted.

In such a configuration, the flexible piece 7b of the cover 7 is fitted into the notch 9k of the terminal accommodating portion 9 so that the convex 7a of the flexible piece 7b is positioned in the guide groove 9m. When the guide plate portion 80 of the inverted L-shaped washer 8a is inserted into the guide groove 9m of the terminal accommodating portion 9 from above, the concave groove 8h of the guide plate portion 80 is fitted with the convex streak 7a of the bending piece 7b and the embodiment of FIG. As in Example 1, a space is maintained between the tip of the male screw 8n and a fixed terminal (not shown). Further, the inverted L-shaped washer guided by the guide groove 9m is provided with the inverted L-shaped washer.
Since the guide of the guide plate portion 80 is released from the guide groove 3m at the position where the electric wire is tightened to the V-shaped washer, electric wires having different diameters can be securely tightened to the left and right similarly to FIG. In the present embodiment, the width of the guide wall 9p is substantially the same as the width of the detail 8t of the inverted L-shaped washer, and a wide taper is provided below the guide wall 9p. Larger than the detail 8t,
If the configuration is such that the side surfaces of the detail 8t do not come into contact when the character-shaped washer is inclined, it is not necessary to provide a taper, and the configuration of the guide groove can be simplified.

[0026]

According to the present invention, the terminal screw is held such that the distal end of the male screw has a fixed distance from the fixed terminal while the guide plate portion of the inverted L-shaped washer is guided by the guide groove. Since the terminal screws can be prevented from falling off, falling over, or lost, the male screw of the terminal screw can be reliably guided into the screw hole of the fixed terminal. Further, since the inverted L-shaped washer can be inclined at the tightening position of the wiring, electric wires on both sides having different wire diameters or electric wires on only one side can be firmly fixed.

[0027]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a terminal device showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a terminal screw of FIG. 1;

FIG. 3 is an exploded perspective view of a terminal device showing one embodiment of the present invention.

FIG. 4 is a partial sectional view of the terminal device showing a fitted state of the present invention.

FIGS. 5A and 5B are cross-sectional views showing a state in which a round crimp terminal is connected to the terminal device of the present invention, wherein FIG. 5A is a diagram showing an insertion state of a round crimp terminal, FIG. c) Connection completion diagram of round crimp terminal

6 (a) is a sectional view of a main part of the terminal device showing a holding state of the terminal screw of FIG. 5 (a), wherein FIG. 6 (a) is an insertion state diagram of an inverted L-shaped washer having a male screw, and FIG. Insertion diagram of L-shaped washer only

FIGS. 7A and 7B are cross-sectional views of main parts when wires having different wire diameters are fixed to both sides of a screw, wherein FIG. 7A is a view showing an inserted state of an inverted L-shaped washer having a male screw, and FIG. Insertion state diagram of washer only

FIG. 8 is an explanatory view of another embodiment of the present invention, wherein (a) is an exploded perspective view of a terminal device, and (b) is a perspective view of a terminal screw.

FIG. 9 is a schematic sectional view of a conventional terminal device.

FIG. 10 is a front view of a main part of a terminal device showing a different conventional example.

11 is a perspective view showing the shape of the terminal screw in FIG. 10, (a) is a front view, and (b) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 1a Convex part (engagement part) 1b Flexure piece 2 Terminal screw 2a Inverted L-shaped washer 2b Thick part 2c Thin part 2h Depression (engagement part) 2n Male screw 3 Terminal accommodation part 3m Guide groove 5 Frame 13 Fixed terminal 31 Round crimp terminal

Continued on the front page (72) Inventor Makoto Kawasaki 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd.

Claims (5)

[Claims] 1. A terminal device of an electric device for connecting a round crimp terminal or the like to a fixed terminal having a screw hole fixed to a terminal accommodating portion of a frame partitioned by an insulating wall, wherein a tip is coupled to the screw hole. A terminal screw comprising a male screw and an inverted L-shaped washer rotatably held by the male screw and having a guide plate bent at one side to the fixed terminal side; The guide plate portion of the letter-shaped washer is inserted to guide the vertical movement of the guide plate portion, and forms a guide groove for releasing the guide of the guide plate portion when the tip of the male screw is connected to the fixed terminal. The engaging portion for holding the guide plate portion guided by the guide groove so that the tip of the male screw has a certain distance from the fixed terminal is connected to the reverse L.
A terminal device for an electronic device, wherein said terminal device is formed on a guide plate portion of said letter-shaped washer and said guide groove side. 2. The terminal device for an electric device according to claim 1, wherein the guide plate portion of the inverted L-shaped washer is formed with a thick portion at the center and a thin portion on both sides, and the guide groove is formed with the thin portion. A terminal device for an electronic device, comprising: a vertical groove for guiding a thickness direction of a portion; and a guide wall for guiding a width direction of the thick portion. 3. The terminal device for an electric device according to claim 1, wherein the guide groove is formed as a vertical groove that guides a thickness direction and a width direction of a guide plate portion of the inverted L-shaped washer. Characteristic terminal equipment for electrical equipment. 4. The terminal device for an electric device according to claim 1, wherein the terminal receiving portion has a notch connected to the guide groove, and a flexible bend fitted into the notch. A terminal device for electrical equipment, wherein an engaging portion on the guide groove side is formed on a piece. 5. The terminal device for an electric device according to claim 4, further comprising a cover attached to a frame, wherein said flexible bending piece is provided on said cover.