JPH08153438A - Terminal structure of electric equipment - Google Patents

Abstract

PURPOSE: To mount a crimp terminal on a terminal part without removing a terminal cover each time. CONSTITUTION: A collar part 15 is protruded radially outward from the screw head 13B outer circumferential wall of a terminal screw 13. An engaging part 14 is protruded radially inward from the through-hole 4 inner circumferential wall of a terminal cover 11 to form a ridge where the collar part 15 and the engaging part 14 are mutually fitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device having a contact inside such as an electromagnetic contactor and a switch, and more particularly to a structure in which a crimp terminal can be easily attached to its terminal portion.

[0002]

2. Description of the Related Art Generally, the above electric equipment has a structure in which a crimp terminal is attached to its terminal portion and is connected to an external circuit through the crimp terminal. FIG. 13 is an exploded perspective view showing a terminal structure of a conventional electric device. In this case, the electric device is an electromagnetic contactor, and the main body case 3
The terminal cover 1 covers the terminal screw 7 fixed to the side. The upper part of the body case 3 is covered with the arc extinguishing cover 2. Each terminal screw 7 is an insulating partition 3A.
And a side wall 3B.

FIG. 13 shows a state before the terminal cover 1 is attached to the main body case 3. The terminal cover 1 is provided with protrusions 1A and 1B and also has a slit 1C.
Are formed. In this terminal cover 1, the projection 1A is formed in the hole 3C formed on the side wall 3B side, and the projection 1B is formed in the arc-extinguishing cover 2.
It is fixed by fitting it into each of the holes 3D formed in the side. The slit 1C is fitted in the partition 3A.

FIG. 14 is a perspective view showing a state where the terminal cover 1 of FIG. 13 is attached to the main body case 3. The terminal cover 1 is provided with a through hole 4, and the through hole 4
By inserting a driver (not shown), the internal terminal screw is rotated, and maintenance is always performed so that the screw is not loosened. FIG. 15 shows F of FIG.
It is a -F sectional view, and the left and right sides of the figure are symmetrical. The arc extinguishing cover 2 on the upper part of the main body case 3 covers the contacts 5A and 10A. The contact 5A is attached to the movable contact 5, and the contact 10A is attached to the fixed contact 10. The movable contact 5 is supported via a spring 6 so as to be movable in the vertical direction. Further, the fixed contact 10 is fixedly supported by the body case 3.

The arc-extinguishing cover 2 shown in FIG. 15 is for confining the arc between the contacts 5A and 10A generated when opening and closing. The terminal screw 7 is screwed to the terminal portion 20 on the fixed contact 10 side via the spring washer 8 and the terminal washer 9. In this case, the terminal portion 20 for screwing is formed integrally with the fixed contact 10. FIG. 16 is a perspective view showing a state in which the lead wire 9 is crimped to the crimp terminal 22. This crimp terminal 22 is a washer terminal 9 and a terminal portion 20 in FIG.
Is interposed between and. An external circuit (not shown) is connected to the right side of the lead wire 21.

Next, a method for attaching the crimp terminal 22 shown in FIG. 16 to the terminal portion 20 shown in FIG. 15 will be described. In FIG. 15, first, the terminal cover 1 is removed. Next, the terminal screw 7 is turned by a driver (not shown), and the terminal screw 7 is pulled out from the terminal portion 20. Next, attach the crimp terminal 22 to the terminal screw 7
The terminal screw 7 is screwed to the terminal portion 20 while being passed through the shaft portion. Finally, the terminal cover 1 is attached. The lead wire 21 of FIG. 16 is drawn out through the gap 23 between the terminal cover 1 and the terminal portion 20 of FIG.

[0007]

However, in the conventional device as described above, it takes a long time to attach the crimp terminal. That is, it was necessary to remove the terminal cover each time the crimp terminal was attached to the terminal portion. Therefore, it took time for the mounting work. In addition, when there are many wiring changes and the like, it is necessary to separate the engaging portion between the protrusion fixing the terminal cover and the main body case side and the hole many times. Therefore, this engaging part is mechanically fatigued,
Finally, it was sometimes impossible to fix the terminal cover to the main body case side.

An object of the present invention is to enable a crimp terminal to be attached to a terminal portion without removing the terminal cover one by one.

[0009]

In order to achieve the above object, according to the present invention, there is provided a terminal structure in which a crimp terminal is attached to a terminal portion pulled out from the inside of a main body case accommodating an electric device. , A terminal screw for screwing the crimp terminal to the terminal portion, a terminal washer that penetrates the shaft portion of the terminal screw and is interposed between the screw head of the terminal screw and the crimp terminal, and a terminal cover that covers the terminal screw The terminal cover is provided with a through hole that is opened on the screw head side of the terminal screw in the axial direction of the terminal screw, and a gap for inserting the crimp terminal is opened between the terminal cover and the terminal portion. In the above, a flange portion projects radially outward from the screw head outer peripheral wall of the terminal screw, an engaging portion projects radially inward from the through hole inner peripheral wall of the terminal cover, and the flange portion and the engaging portion Screw with and fit together To form.

Further, in this structure, a plurality of flange portions may be partially provided in the circumferential direction of the through hole. Further, in such a configuration, the thickness of each flange may be formed so as to become thinner toward the edge on the circumferential direction side of the through hole. Further, in such a configuration, a plurality of engaging portions may be partially provided in the circumferential direction of the through hole.

Further, in this structure, the engaging portions may be formed so that the wall thickness of each engaging portion becomes thinner toward the edge of the through hole in the circumferential direction. Further, in such a configuration, a cutout portion into which the terminal washer is fitted may be formed on the inner wall of the through hole of the terminal cover. Further, in such a configuration, the electric device may include a movable contactor and a fixed contactor that form a contact portion that can be contacted and separated from each other, and a cover that covers the contact portion may be integrally formed with the terminal cover.

[0012]

According to the structure of the present invention, the flange portion is provided so as to project radially outward from the screw head outer peripheral wall of the terminal screw, and the engaging portion is provided radially inward from the through hole inner peripheral wall of the terminal cover. To project. The collar portion and the engaging portion form threads that fit together. When installing the crimp terminal, insert the screwdriver into the through hole of the terminal cover and rotate the terminal screw in the loosening direction. Just before the shaft portion of the terminal screw comes out from the terminal portion on the fixed contact side, the flange portion and the engaging portion are fitted to each other on the screw head side. When the terminal screw is further rotated in the loosening direction, the flange portion and the engaging portion are fitted together, and the shaft portion of the terminal screw separates from the terminal portion on the fixed contact side. At that time, a space between the tip of the shaft portion of the terminal screw and the terminal portion on the fixed contact side is opened, so that the crimp terminal can be inserted between them. Insert the crimp terminal into the interior through the gap between the terminal cover and the terminal on the fixed contact side, and pass the crimp terminal through the shaft of the terminal screw. In this state, rotate the terminal screw in the tightening direction to fix the terminal screw to the terminal portion on the fixed contact side. By this method, the crimp terminal can be attached to the terminal portion without removing the terminal cover one by one.

Further, in this structure, if a plurality of flange portions are partially formed in the circumferential direction of the through hole, the collar portion is simultaneously molded when the screw head of the terminal screw is cold forged. be able to. Further, in such a configuration, by forming the thickness of each brim portion to become thinner toward the edge of the through hole circumferential direction side,
When the terminal screw is turned, the collar portion and the engaging portion fit smoothly with each other.

Further, in such a structure, if a plurality of engaging portions are partially formed in the circumferential direction of the through hole, the engaging portions should be pre-molded in the mold when the terminal cover is resin-molded. Thereby, the engaging portion can be molded at the same time. Further, in such a configuration, the engaging portion is formed such that the wall thickness becomes thinner toward the edge on the circumferential side of the through hole, so that when the terminal screw is turned, the collar portion and the engaging portion are rotated. And fit smoothly together.

Further, in this structure, the terminal screw is loosened by forming the notch in which the terminal washer is fitted on the inner wall of the through hole of the terminal cover, and the shaft portion of the terminal screw is separated from the terminal portion on the fixed contact side. However, since the terminal washer fits into the notch, the terminal screw does not tilt. Further, the notch portion serves as a stopper for the terminal screw, and it is possible to prevent the terminal screw from being excessively turned.

Further, in such a structure, the electric device is provided with a movable contactor and a fixed contactor which form a contact portion which can be contacted and separated from each other, and a cover which covers the contact portion is formed integrally with the terminal cover. Since it is not necessary to remove the terminal cover when attaching the crimp terminal, if there is a cover for covering the contact portion, there is no problem even if the cover and the terminal cover are integrally formed in advance.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a terminal structure of an electric device according to an embodiment of the present invention. Through hole 4 of terminal cover 11
The inner wall is provided with an engaging portion 14 that projects inward in the radial direction. In addition, the terminal screw 13 screwed to the terminal portion 20
The screw head 13B is provided with a flange portion 15 that projects radially outward.

FIG. 2 is an enlarged sectional view of the main part of FIG. The engaging portion 14 and the collar portion 15 form a thread for fitting with each other as described later. The terminal screw 13 is composed of a screw head 13B protruding from the flange portion 15 and a shaft portion 13A fitted in the screw hole 25, and is screwed to the terminal portion 20 via the spring washer 8 and the terminal washer 16. . The crimp terminal 22 shown in FIG. 16 is interposed between the terminal washer 16 and the terminal portion 20.

FIG. 3 is a perspective view showing the terminal screw and the washer of FIG. 2 taken out. The collar portion 15 has a screw head 13B.
Is partially formed over the outer circumference of the terminal screw 13 and is provided with a step in the axial direction of the terminal screw 13 so that each flange portion 15 becomes a screw thread. A spring washer 8 formed by twisting a washer and a barbed terminal washer 16 penetrate through the shaft portion 13A.

FIG. 4 is a fragmentary perspective view showing a fragmentary part of the terminal cover 11 shown in FIG. Engaging part 14
Are partially formed over the inner peripheral wall of the through hole 4 of the terminal cover 11. FIG. 5 is a fragmentary enlarged perspective view of the crushing and enlarging the through hole of FIG. 4. The thickness of each of the engaging portions 14 is equal to the edge 14 of the through hole 4 on the circumferential direction 4A side.
It is inclined so that it becomes thinner as it goes to A on both sides.

Other configurations not described in FIGS. 1 to 5 are the same as those of the conventional configuration shown in FIGS. 13 to 15. The same portions will be denoted by the same reference symbols and repeated detailed description will be omitted. Especially,
FIG. 1 corresponds to the cross section of the conventional device of FIG. Figure 6
FIG. 2 is a sectional view taken along line GG in FIG. 1. In this embodiment, four terminal screws 13 are arranged side by side, but FIG. 6 shows a cross section of up to three terminal screws 13 and shows the operating condition when the terminal screws 13 are loosened. The terminal screw 13 on the left side of FIG.
The crimp terminal is not attached yet and is in the lowest position.

In the terminal screw 13 at the center of FIG. 6, a driver (not shown) is inserted from the upper portion of the through hole 4 in the left side state, the screw head 13B is rotated, and the collar portion 15 and the engaging portion 14 are fitted to each other. It is in the state where it has begun to do. At that time, the lowermost end of the shaft portion 13A is left on the dimension C, and is set just before coming out of the terminal portion 20. Further, the terminal washer 16 has a screw head 13
When B is rotated, it self-ups along with the shaft 13A. That is, in the shaft portion 13A, the screw is formed only halfway, and from there, the screw head 13
The diameter is narrowed to the lower end of B. The terminal washer 16 does not drop downward from the threaded portion of the shaft portion 13A, and only the upper portion thereof can slide up and down.

The terminal screw 13 on the right side of FIG. 6 is in the state of being raised to the maximum by further rotating the screw head 13B in the central state. The shaft portion 13A rises due to the screw effect due to the engagement between the engaging portion 14 and the collar portion 15, and the dimension B becomes clear between the shaft portion 13A and the terminal portion 20. A crimp terminal is inserted from the front side in FIG. 6 between the dimensions B, and the screw head 13B is rotated in the opposite direction. As a result, the terminal screw 13 is lowered in the order of the center and the left side of FIG. 6, so that the crimp terminal is fixed to the terminal portion 20. That is, with the configuration of FIG. 1, the crimp terminal can be attached to the terminal portion 20 without removing the terminal cover 11.

In FIG. 6, the dimension A obtained by subtracting the remaining dimension C at the tip of the shaft 13A from the step dimension A of the engaging portion 14 is B.
Equivalent to. The dimension B is set to be equal to or larger than the thickness of the crimp terminal in advance. If the dimension B is set to be multiple times the thickness of the crimp terminal, a plurality of crimp terminals can be attached at the same time. The configuration of FIG. 6 is not limited to the electromagnetic contactor, and is also applicable to a terminal structure of a general electric device that includes a terminal portion that is pulled out from the inside of the main body case to which a crimp terminal is attached. It is possible.

FIGS. 7 to 9 are views showing the structure of the terminal screw according to different embodiments of the present invention, in which (A) is a plan view and (B) is a side view. The outer peripheral wall of the screw head 13B in FIGS. 7, 8 and 9 is partially provided with three, four and two flange portions, respectively. 7 to 9, the collar portion 15 may not be partially arranged, and may be a continuous thread like the shaft portion 13A. However, lathe machining is required to form continuous threads. Collar 1 of FIGS. 7 to 9
By partially forming the threaded portion as in No. 5, it is possible to perform work forming by cold forging only by hammering. Therefore, the manufacturing time of the terminal screw is significantly reduced.

Further, the engaging portion 14 of FIG. 5 may also be a continuous thread without being partially disposed. However, in this case as well, lathe processing is required as with the collar portion. By partially forming the screw portion like the engaging portion 14 in FIG. 5, the shape of the engaging portion can be included in advance in the mold for molding the terminal cover. Therefore, the manufacturing time of the terminal cover is significantly reduced.

That is, both the brim portion and the engaging portion may be circumferentially continuous, or one of them may be partially formed and the other may be continuous. Further, the collar portion and the engaging portion may be partially formed as in the above-described embodiment, which greatly reduces the manufacturing time of the entire device. In addition, in FIG. 5, FIG. 7 to FIG.
The thickness of the flange portion 15 and the flange portion 15 become thinner toward the circumferential edges 14A and 15A of the through hole 4.
Therefore, the engaging portion 14 and the collar portion 15 are fitted smoothly.

FIG. 10 is a sectional view showing a terminal structure of an electric device according to a further different embodiment of the present invention. A cutout portion 18 is provided in the lower portion of the inner wall of the through hole 4 of the terminal cover 17, and the cutout portion 18 is formed so that the terminal washer 16 is just fitted therein. Other configurations are the same as those in FIG. FIG. 11 is an enlarged cross-sectional view of the main part of FIG. 10, showing a state where the terminal screw 13 is loosened and screwed up to the uppermost part. The terminal washer 16 fits into the notch 18, and the terminal screw 1
3 is prevented from tilting at an angle. Also, the notch 18
The upper surface 18A of the above serves as a stopper for the terminal washer 16. As a result, the terminal screw 13 is prevented from being excessively turned, and the terminal screw 1
It is possible to prevent 3 from coming out upward.

FIG. 12 is a sectional view showing a terminal structure of an electric device according to still another embodiment of the present invention. A cover 19 in which an arc extinguishing cover and a terminal cover are integrated is arranged. Other configurations are the same as those in FIG. Since it is not necessary to remove the terminal cover when attaching the crimp terminal, the arc extinguishing cover 2 and the terminal cover 11 do not have to be separately provided as in FIG. As a result, the number of parts is reduced and the cost is greatly reduced.

[0030]

As described above, according to the present invention, the flange portion projects radially outward from the screw head outer peripheral wall of the terminal screw, and engages radially inward from the through hole inner peripheral wall of the terminal cover. Project the part. The collar portion and the engaging portion are formed with threads that fit with each other. As a result, the crimp terminal can be attached to the terminal portion without removing the terminal cover one by one, and the number of steps for attaching the crimp terminal is significantly reduced.

Further, in this structure, if a plurality of collar portions are partially formed in the circumferential direction of the through hole, the collar portion is simultaneously molded when the screw head of the terminal screw is cold forged. Therefore, the manufacturing cost of the terminal screw is significantly reduced. In addition, in such a configuration, by forming the thickness of each collar portion to become thinner toward the edge of the through hole circumferential direction side, when the terminal screw is rotated, the collar portion and the engaging portion are Fits smoothly with each other, making it easy to attach the crimp terminal.

Further, in such a structure, if a plurality of engaging portions are partially formed in the circumferential direction of the through hole, the engaging portions should be pre-molded in the mold when the terminal cover is resin-molded. Thereby, the engaging portion can be molded at the same time, and the manufacturing cost of the terminal cover is significantly reduced. Further, in such a configuration, the engaging portions are formed such that the wall thickness of the engaging portions becomes thinner toward the peripheral edge of the through hole, so that when the terminal screw is turned, the engaging portions engage with the flange portions. The mating part fits smoothly and the crimp terminal can be easily attached.

Further, in such a structure, by forming a notch in which the terminal washer is fitted in the inner wall of the through hole of the terminal cover, when the terminal screw is loosened, the terminal screw does not tilt and the terminal screw falls down. Will disappear. Further, the notch portion serves as a stopper for the terminal screw, and it is possible to prevent the terminal screw from being excessively turned. Also, in such a configuration,
The electric device includes a movable contactor and a fixed contactor that form a contact portion that can be contacted and separated from each other, and a cover that covers the contact portion is formed integrally with the terminal cover. As a result, the number of parts of the device is reduced and the manufacturing cost is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a terminal structure of an electric device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the main part of FIG.

FIG. 3 is a perspective view showing a terminal screw and a washer of FIG. 2 taken out and shown.

FIG. 4 is a perspective view of an essential part showing only the terminal cover shown in FIG.

5 is a fragmentary enlarged perspective view showing the fragmentary enlarged crushed through-hole of FIG. 4;

6 is a sectional view taken along line GG of FIG.

7A and 7B are diagrams showing a configuration of a terminal screw according to another embodiment of the present invention, in which FIG. 7A is a plan view and FIG. 7B is a side view.

8A and 8B are diagrams showing a configuration of a terminal screw according to a further different embodiment of the present invention, in which FIG. 8A is a plan view and FIG. 8B is a side view.

9A and 9B are diagrams showing a structure of a terminal screw according to still another embodiment of the present invention, FIG. 9A being a plan view and FIG. 9B being a side view.

FIG. 10 is a sectional view showing a terminal structure of an electric device according to still another embodiment of the present invention.

11 is an enlarged cross-sectional view of the main part of FIG.

FIG. 12 is a sectional view showing a terminal structure of an electric device according to still another embodiment of the present invention.

FIG. 13 is an exploded perspective view showing a terminal structure of a conventional electric device.

FIG. 14 is a perspective view showing a state in which the terminal cover shown in FIG. 13 is attached to a main body case.

FIG. 15 is a sectional view taken along line F-F in FIG.

FIG. 16 is a perspective view showing a state in which a lead wire is crimped to a crimp terminal.

[Explanation of symbols]

1, 11, 17: terminal cover, 2: arc extinguishing cover, 4: through hole, 5: movable contact, 10: fixed contact, 5A, 10
A: contact, 22: crimp terminal, 13: terminal screw, 13A:
Shaft part, 13B: Screw head, 14: Engagement part, 15: Collar part,
16: Terminal washer, 20: Terminal part, 14A, 15A: Edge, 18: Notch part, 19: Cover

Claims (7)

[Claims] 1. A terminal structure for attaching a crimp terminal to a terminal portion drawn out from the inside of a main body case for accommodating an electric device, the terminal screw for screwing the crimp terminal to the terminal portion, and the terminal screw It consists of a terminal washer that penetrates the shaft part and is interposed between the screw head of the terminal screw and the crimp terminal, and a terminal cover that covers the terminal screw.The terminal cover covers the terminal screw on the screw head side of the terminal screw. With a through hole opened in the axial direction and a gap for inserting the crimp terminal between the terminal cover and the terminal part is opened, the flange part is located radially outward from the screw head outer peripheral wall of the terminal screw. The engaging portion is provided so as to project from the inner peripheral wall of the through hole of the terminal cover inward in the radial direction, and the flange portion and the engaging portion form a thread for fitting with each other. Terminal structure of electrical equipment. 2. The terminal structure for an electric device according to claim 1, wherein a plurality of flange portions are partially provided in a circumferential direction of the through hole. 3. The terminal structure for an electric device according to claim 2, wherein the thickness of each of the flange portions is formed so as to become thinner toward an edge of the through hole in the circumferential direction. 4. The terminal structure for an electric device according to claim 1, wherein a plurality of engaging portions are partially provided in a circumferential direction of the through hole. 5. The terminal structure for an electric device according to claim 4, wherein the thickness of each engaging portion is formed so as to become thinner toward the edge of the through hole in the circumferential direction. . 6. The terminal structure for an electric device according to claim 1, wherein a cutout portion into which a terminal washer is fitted is formed in an inner wall of the through hole of the terminal cover. 7. The device according to claim 1, wherein the electric device includes a movable contactor and a fixed contactor that form a contact portion that can be contacted and separated from each other, and a cover that covers the contact portion is a terminal. A terminal structure for an electric device, which is formed integrally with a cover.