JPH0917481A - Washer, screw, screw mounting structure and terminal block structure - Google Patents

Abstract

PURPOSE: To prevent the loss of a screw when a lead wire is screw-connected to a terminal block or the terminal metal fitting of a socket, and facilitate the screw installing operation to the terminal metal fitting. CONSTITUTION: In a screw mounting structure in which a screw 8 is inserted to, together with a washer 7, and mounted on a screw mounting hole formed on an object to mount the screw 8, an engaging hole 10 formed vertically long along the inserting direction of the screw 8 with a width smaller than the width of the side part of the washer 7 is formed on the object. The washer 7 has a lock part 7b which is movable in the screw inserting direction within the engaging hole 10 and locked so as not to be dropped out from the engaging hole 10 on a washer body 7a to which the screw 8 is inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer, a screw, a screw mounting structure thereof, and a terminal used for screw-connecting a lead wire to a terminal block for external wiring or a terminal fitting of a socket in various control devices. Regarding the platform structure.

[0002]

2. Description of the Related Art When a lead wire is screw-connected to a terminal block or socket terminal fitting, a flat washer-like connecting fitting is crimped or soldered to the end of the lead wire in advance, and the fitting is provided with a washer. It is common to insert the screw of and tighten it to the terminal fitting to fix it.

Further, as a terminal block structure of a control device, a plurality of external wiring terminals arranged in parallel are housed and arranged between ribs provided in a case to enhance insulation between terminals to prevent a wiring short circuit accident. In order to prevent this, the terminal fittings that form the external wiring terminals and the square screws with washers are assembled in advance on each of the plurality of terminal blocks that are arranged in parallel at a predetermined interval.
There is a structure in which the terminal is housed between the ribs by inserting the pre-assembly into a case having ribs formed therein.

[0004]

SUMMARY OF THE INVENTION In order to connect a lead wire having a flat washer-like connecting fitting to a terminal fitting or to replace the lead wire, it is necessary to temporarily remove the screw from the terminal fitting. When performing wiring work in a cramped posture in a narrow work space such as inside, the screws are often lost and lost. In addition, it takes a lot of time to attach the screws that have been removed, and it takes a lot of time for the wiring work.

Further, in a control device having a structure in which a pre-assembled product in which a terminal metal fitting and a square screw with a washer are assembled in advance in each of a plurality of terminal blocks is inserted into a case, when the pre-assembled product is inserted into the case. In some cases, the square washer provided for the square screw on each terminal block may rotate around the terminal block and project from the side of the terminal block due to vibration during transportation. In other words, if a part of the washer protrudes into the space where the partition rib provided in the case is inserted, the rib will be caught by the protruding washer and it will not be possible to assemble it to the case. It was necessary to pull it out from the machine and correct the posture of the washer and then insert it again, which required a lot of assembly work.

The present invention has been made in view of such a point, and its first object is to prevent the loss of the screw when the lead wire is screw-connected to the terminal fitting of the terminal block or the socket. It is an object of the present invention to provide a washer, a screw with a washer, and a screw mounting structure using the washer that can prevent the occurrence of the above and can easily perform the screw mounting operation to the terminal fitting.

A second object of the present invention is to provide a control device having a structure in which a pre-assembled product in which a terminal fitting and a square screw with a washer are assembled in advance in each of a plurality of terminal blocks is inserted into a case.
An object of the present invention is to provide a terminal block structure that is effective for quickly assembling without requiring a washer posture correction process.

[0008]

In order to achieve the first object, the present invention has the following constitution.

The washer of the invention according to claim 1 is characterized in that a washer main body provided with a screw insertion hole is provided with an engaging portion capable of engaging with an object to which the screw is attached.

According to a second aspect of the invention, in the washer according to the first aspect, the locking portion includes an insertion portion having a width smaller than a width of a side portion of the washer body, and a retaining portion having a width greater than the insertion portion. It is characterized by having.

The invention according to claim 3 is the washer according to claim 2, wherein the retaining portion is in a plane of the washer main body.

The invention according to claim 4 is the washer according to claim 2, characterized in that the retaining portion is bent in the insertion direction of the screw into the insertion hole.

A screw according to a fifth aspect of the present invention includes the washer according to any one of the first to fourth aspects.

According to a sixth aspect of the present invention, there is provided a screw mounting structure in which a screw is inserted together with a washer into a screw mounting hole formed in an object to which the screw is attached, and the object is attached to the object. Is formed with a longitudinally long engagement hole along the insertion direction of the screw and having a width smaller than the width of the side portion of the washer, and the washer is located in the engagement hole in the washer body through which the screw is inserted. Then, it has a locking portion that is movable in the screw insertion direction and that is prevented from coming off from the engagement hole.

According to a seventh aspect of the present invention, there is provided a screw mounting structure according to the sixth aspect, wherein the locking portion is inserted into the engagement hole at a position where the screw is inserted into the object. And a retaining portion that is retained by the peripheral wall of the engagement hole in this inserted state.

A screw mounting structure according to an eighth aspect of the present invention is the screw mounting structure according to the sixth or seventh aspect, wherein the object is a terminal block or a socket.

According to a ninth aspect of the terminal block structure of the present invention, the terminal block structure is provided with a plurality of terminal blocks located between the ribs provided at a predetermined interval in the case. The terminal fittings were placed with the rear portions of the terminal fittings engaged with the receiving surfaces that were erected on the rear of the terminal fittings, and rectangular screws with rectangular washers were inserted into the respective insertion holes of the terminal fittings. In the terminal block structure housed between the ribs of the case in a state, a positioning structure for positioning the respective washers in a certain direction with respect to the ribs in a state before housing the case is provided. Is characterized by.

A terminal block structure according to a tenth aspect of the present invention is the terminal block structure according to the ninth aspect, wherein the positioning structure extends the rear surface of the washer to the receiving surface of the terminal fitting so that the terminal surface is positioned. It is characterized by doing.

According to an eleventh aspect of the present invention, in the terminal block structure according to the ninth aspect, the positioning structure positions by engaging the side surface of the washer with the protrusion of the terminal fitting. It is characterized by

A terminal block structure according to a twelfth aspect of the present invention is the terminal block structure according to the ninth aspect, wherein the positioning structure extends the receiving surface of the terminal block forward and contacts the rear surface of the washer. It is characterized by being positioned by.

[0021]

According to the first to eighth aspects of the invention, in the lead wire connecting portion for inserting the screw through the washer body and the connecting metal fitting of the lead wire and tightening on the object such as the terminal metal fitting, the screw is removed from the object. By constructing the locking part so that the locking part of the washer body is locked to the target object even if it is pulled out, the screw is pulled out from the target object and the lead wire connecting metal fitting is screwed. Even if the screw is removed, the screw is locked and held on the object through the washer body, so that the screw is not removed. Further, since the screw does not drop from the object, the screwing operation becomes easy.

Specifically, the locking portion is formed in a shape having an insertion portion smaller than the width of the side portion of the washer body and a retaining portion having a width larger than the insertion portion, and Forms a vertically long engagement hole along the insertion direction of the screw and having a width smaller than the width of the side portion of the washer, and engages the locking portion of the washer body with the engagement hole of the object. Therefore, the above function can be exerted.

Here, if the retaining portion has a shape lying in the plane of the washer body, the washer having the desired function can be manufactured only by punching.

Further, when the retaining portion is formed in a shape bent in the insertion direction of the screw into the insertion hole, the movement space of the washer accompanying the movement of the screw becomes small.

By preliminarily assembling the washer and the screw in such a state that they are not separated from each other, handling becomes easy.

By using the above screw mounting structure for a terminal block or socket of a control device having a large number of lead wire connecting portions, wiring operation can be easily performed.

According to the ninth to twelfth aspects, when the terminal fitting and the square screw with the washer are assembled in advance to each of the plurality of terminal blocks and the pre-assembly is inserted into the case,
By contact between the rear surface of the washer extended rearward and the receiving surface of the terminal block, or by the engagement of the side surface of the washer and the protrusion of the terminal fitting, or the extension of the receiving surface of the terminal block and the rear surface of the washer. By contacting, the rectangular washers provided on the square screws in each terminal block are positioned in a certain direction, and the washer is placed between the adjacent terminal blocks, that is, in the space where the partition rib provided in the case is inserted. Part of the will not overflow.

[0028]

FIG. 5 is an external view of a socket using a washer, a screw and a screw mounting structure according to the present invention, FIG. 1 is a vertical side surface of one lead wire connecting portion, and FIG. 2 is a vertical front surface thereof. 3 shows a cutaway part of the lead wire connecting part, and FIG.
Shows the disassembled state of the lead wire connecting portion.

The socket 1 is composed of a resin-molded socket body 1a and a case 1b which is externally fitted and mounted on the socket body 1a. A plurality of recessed portions 3 partitioned by insulating ribs 2 are formed in parallel on the case 1b. Then, the terminals 5 for connecting the lead wires 4 are assembled to the respective recessed portions 3. The terminal 5 is a terminal metal fitting 6 formed by punching out a thick metal plate.
And a screw 8 to which a square washer 7 is attached.

The terminal metal fitting 6 is positioned and fixed in a fixed posture in the socket body 1a, and a screw mounting hole 9 into which a screw 8 is screwed is inserted in a central portion thereof.
Is formed, and the screw mounting hole 9 is exposed at the center of the bottom of the recess 3 in a state where the socket body 1a and the case 1b are assembled.

The washer 7 is mounted just below the head of the screw 8 so that it can only rotate and cannot be pulled out. The washer 7 is integrally formed with a locking portion 7b on one side of the square washer body 7a. ing. The locking portion 7b includes an insertion portion 7b ₁ of width less than the width of one side of the washer body 7a, which has a stopper portion 7b ₂ dislodgement larger width than the insertion portion, the retaining portion 7b ₂ screw 8 is bent at a right angle to the insertion direction.

An opening 3a for exposing the terminal fitting 6 is formed at the bottom of each recess 3 in the case 1b, and a side wall 3a of the recess 3 has a slit-like engagement opening toward the opening 3a. A joint hole 10 is formed. The engagement hole 10 is formed to have a width slightly larger than the width of the insertion portion 7b ₁ of the locking portion 7b, and the locking portion 7b ₂ is engaged with the locking portion 7b in the engagement hole 10. The peripheral wall of the hole 10 is designed to be prevented from coming off.

A flat washer-like connecting fitting 4a is fixed to the lead wire 4 by caulking or soldering at the tip. As shown in FIG. 1A, the screw 8 inserted in the connecting fitting 4a is connected to the terminal. By screwing into the metal fitting 6, the connecting metal fitting 4a is sandwiched and fixed between the terminal metal fitting 6 and the washer body 7a of the washer 7, and the lead wire 4 and the terminal metal fitting 6 are electrically connected. Then, as shown in FIG. 1B, even when the screw 8 is loosened and removed from the terminal fitting 6, and the screw 8 is retracted to a state where the connecting fitting 4a can be pulled out, the locking portion of the washer 7 is also removed. The engagement state between 7b and the engagement hole 10 is maintained, and the screw 8 inserted into the washer 7 is also retained in the socket 1 without coming off.

A modified example of the washer 7 is shown in FIGS. 6 and 7.

The washer 7 in this example includes the insertion portion and 7b ₁
And the locking portion 10 having the retaining portion 7b ₂ and the washer body 7a.
It is formed so as to lie in the plane of, and is manufactured only by punching the material, and functions as in the previous example.

8 to 16 show an embodiment in which the terminal block structure according to the present invention is applied to a control device.

As shown in FIGS. 8 and 9, a large number of recessed portions 13 partitioned by insulating ribs 12 are formed in parallel at the end of the case 11 of the control device, so that the control circuit structure inside the case is formed. A large number of connected external wiring terminals 14 are assembled in each recess 13. The group of terminals 14 is
For example, the sensor lines, the power lines, the output lines, and the like are arranged with step differences according to the line type, so that miswiring can be prevented.

As shown in FIG. 8, the terminal 14 includes a terminal fitting 16 which is fitted and fixed in a resin-molded terminal block 15.
And a washer 1 that is screwed into the mounting hole 19 of the
Some of this terminal block structure is shown below.

(First Example) As shown in FIGS. 10 and 11, a circuit connecting portion 16a is bent and extended from a terminal fitting 16 formed by punching a thick plate material, and a tip end of the circuit connecting portion 16a is a circuit board. It is inserted and connected to the connection hole 20a formed in parallel with 20, and is soldered and connected to the circuit pattern on the substrate surface.

A receiving surface 15a is provided upright on the rear portion of the terminal block 15, and the terminal fitting 1 is fitted in the engaging hole 21 formed in the receiving surface 15a.
6 is engaged with a projecting piece 16b provided at the rear end of the terminal block 15, and the projecting portions 15b provided on the left and right of the front part of the terminal block 15 and the terminal fitting 1
The terminal fitting 16 is positioned and fixed on the terminal base 15 by engaging with the notch recess 16c formed at the front corner of the terminal 6.

The washer 17 attached to the square screw 18 is formed in a long rectangle extending back and forth with respect to the screw insertion portion, and the square screw 8 is inserted into the screw mounting hole 19 of the terminal fitting 16. In the inserted state, the rear surface 17a of the washer 17 contacts the receiving surface receiving surface 15a of the rear portion of the terminal block over the entire width. In other words, when the square screw 18 is assembled, the washer 17 is positioned so as not to protrude to the left and right of the terminal block 15 in a fixed direction.

In this way, the terminals 14 are connected through the terminal block 15.
After preliminarily assembling the group to the circuit board 20, by inserting this preliminary assembly into the case 11, the recessed portion 1 between the ribs 12 is formed.
The terminals 14 are housed in the housing 3. However, at this time, since the washers 17 are attached to the left and right of the terminal block 15 without protruding, the terminals 14 can be housed between the ribs 12 without any trouble.

(Second Example) FIGS. 12 and 13 show a second example of the terminal block structure. In this example, a square washer 17 is used, but one of the recesses 17b formed by cutting out at four sides of the washer 17 is engaged with the protrusion 16d formed by cutting and raising the side of the terminal fitting 16. By doing so, the washer 17 is positioned and assembled in a fixed direction so as not to protrude to the left and right of the terminal block 15.

(Third Example) FIGS. 14 and 15 show a third embodiment of the terminal block structure. In this example, a square washer is used as the washer 17, but a part of the receiving surface 15a at the rear of the terminal block 15 is extended forward, and the extending portion 15c is formed on the rear surface 17a of the square washer. By making contact with each other, the washer 17 is positioned and assembled in a fixed direction so as not to protrude to the left and right of the terminal block 15.

[0045]

According to the present invention, the following effects can be obtained.

According to the washer according to the first to fourth aspects of the invention, the screw according to the fifth aspect of the invention, and the screw mounting structure according to the sixth aspect to the eighth aspect of the invention, a lead having a flat washer-like coupling fitting is provided. Even if the screw is loosened and removed from the terminal metal fitting to remove or attach the wire, it is possible to hold the screw through the washer engaged with the screwed object through the locking portion, This is effective for easy wiring work in a narrow control panel.

According to the terminal block structure of the ninth to twelfth aspects of the present invention, a structure in which a pre-assembled product in which a terminal metal fitting and a square screw with a washer are previously assembled to each of a plurality of terminal blocks is inserted into a case In the control equipment of the above, when inserting the pre-assembly into the case, the rectangular washer provided for the square screw in each terminal block does not rotate in an arbitrary direction and protrudes from the terminal block. The square screw can be easily housed between the ribs, and the assembly process can be performed quickly without the need for the posture correction process of the washer.

[Brief description of the drawings]

FIG. 1A is a vertical sectional side view showing a lead wire connecting portion in a lead wire connected state. FIG. 1B is a vertical sectional side view showing a lead wire connecting portion in a lead wire detached state.

FIG. 2 is a vertical sectional front view showing a lead wire connecting portion in a lead wire connected state.

FIG. 3 is a perspective view of a lead wire connecting portion.

FIG. 4 is an exploded perspective view of a lead wire connecting portion.

FIG. 5 is an external perspective view of the socket.

FIG. 6 is a perspective view showing a screw with a washer of another embodiment.

FIG. 7A is a vertical sectional side view showing a lead wire connecting portion using a screw with a washer of another embodiment. FIG. 7B is a vertical sectional front view showing a lead wire connecting portion using a screw with a washer of another embodiment.

FIG. 8A is a vertical cross-sectional view showing a main part of a terminal block structure. FIG. 8B is a vertical cross-sectional view of a main part showing an assembly process.

FIG. 9 is an external perspective view of the device

FIG. 10A is an exploded perspective view of the terminal structure in the first example. FIG. 10B is a perspective view of the assembled terminal.

FIG. 11 is a partially cutaway plan view of the preassembled terminal structure.

FIG. 12A is an exploded perspective view of the terminal structure in the second example. FIG. 12B is a perspective view of the assembled terminal.

FIG. 13 is a partially cutaway plan view of the preassembled terminal structure.

FIG. 14A is an exploded perspective view of the terminal structure in the third example. FIG. 14B is a perspective view of the assembled terminal.

FIG. 15 is a partially cutaway plan view of the preassembled terminal structure.

[Explanation of symbols]

7 Washer 7a Washer main body 7b Locking part 7b ₁ Inserting part 7b ₂ Retaining part 8 Screw 9 Screw mounting hole 10 Engagement hole 11 Case 12 Rib 13 Recessed part 14 Terminal 15 Terminal block 15a Receiving surface 16 Terminal metal fitting 16d Protrusion 17 Washer 17a Rear surface 18 Square screw 19 Screw mounting hole

Claims (12)

[Claims] 1. A washer comprising: a washer body provided with a screw insertion hole; 2. The washer according to claim 1, wherein the locking portion has an insertion portion smaller than a width of a side portion of the washer body and a retaining portion having a width larger than the insertion portion. 3. The washer according to claim 2, wherein the retaining portion is in a plane of the washer body. 4. The washer according to claim 2, wherein the retaining portion is bent in a direction in which the screw is inserted into the insertion hole. 5. A screw provided with the washer according to any one of claims 1 to 4. 6. A screw mounting structure in which a screw is inserted together with a washer into a screw mounting hole formed in an object to which the screw is attached, the object being along an insertion direction of the screw and the washer. Is formed in the washer main body through which the screw is inserted and is movable in the screw insertion direction. And a screw mounting structure having a locking portion that is prevented from coming off from the engagement hole. 7. The engagement portion has an insertion portion that is inserted into the engagement hole at a position where a screw is inserted into the object, and in this insertion state, a retaining wall is provided on the peripheral wall of the engagement hole. 7. The screw mounting structure according to claim 6, further comprising: a retaining portion to be removed. 8. The screw mounting structure according to claim 6, wherein the object is a terminal block or a socket. 9. A case is provided with a plurality of terminal blocks arranged between ribs provided at a predetermined interval,
Each terminal block is placed with its rear part engaged with the receiving surface that is erected on the rear part of each terminal block, and the corners with rectangular washers are inserted into the insertion holes of each of these terminal blocks. In a terminal block structure housed between ribs of the case with screws respectively inserted therein, a positioning structure for positioning the respective washers in a certain direction with respect to the ribs before housing the case. A terminal block structure characterized by having. 10. The terminal block structure according to claim 9, wherein the positioning structure positions the rear surface of the washer by extending and contacting a receiving surface of the terminal fitting. 11. The terminal block structure according to claim 9, wherein the positioning structure positions by engaging a side surface of the washer with a protrusion of the terminal fitting. 12. The terminal block structure according to claim 9, wherein the positioning structure performs positioning by extending a receiving surface of the terminal block forward and contacting a rear surface of the washer.