JP4800411B2 - Screw-up unit and manufacturing method thereof, switch unit section, switch - Google Patents

Description

  The present invention provides a screw-up operation that facilitates screw fastening work by moving (up) the screw together with a washer in a direction perpendicular to the terminal surface in a state where the screw is rotated and removed from the screw hole of the terminal. Screw-up unit having function and manufacturing method thereof, switch unit portion using this screw-up unit, switchboard such as nuclear power plant, thermal power plant and substation, control panel and monitoring panel using this screw-up unit It is related with switches, such as change-over switches, such as a drum switch and a cam switch used for the above.

  This type of conventional screw-up function is used in a screw-up type terminal block as a wiring relay and branching device used in the above-described switchboards, control panels and monitoring panels. The screw-up function of the conventional screw-up type terminal block will be described in detail with reference to FIGS.

  7 is a perspective view of the conventional screw-up type terminal block disclosed in Patent Document 1 when viewed obliquely from above, and FIG. 8 shows a state in which the screw, washer and compression spring of FIG. 7 are assembled. It is a perspective view.

  As shown in FIGS. 7 and 8, the conventional screw-up type terminal block 1 includes a screw 2 such as a pan screw formed by fitting a spack as a washer means and a flat washer 21 into a screw neck, An L-shaped washer 3 having a screw-holding hole capable of holding the head by externally fitting the neck, and a terminal 5 having a screw-hole 4 for fastening at one end of a strip-shaped metal strip A unit 6 made of an insulating member that holds the terminal 5 and guides the screw 2 in a direction perpendicular to the terminal 5 so as to move (up / down) together with the washer 3, and a unit below the screw hole 4 of the terminal 5 One end is inserted into a nut 7 that is accommodated in the hexagonal hole 6 and can be screwed into the screw 2 through the screw hole 4, and a protrusion provided on the back of the L-shaped washer 3. In the direction away from 3 and a compression spring 8 for biasing the.

  Since the screw 2 is screw-formed after the spack (S washer) and the flat washer 21 are fitted into the screw neck, the spuck and the flat washer 21 do not fall off from the screw body. In this case, the outer diameter of the flat washer 21 is larger than the outer diameter of the spuck.

  The washer 3 is composed of a rectangular washer member 31 having a screw holding hole and a support member 32 connected to one side of the washer member 31 in an L shape. The support member 32 is arranged in a direction perpendicular to the wide surface of the terminal 5, and a central portion in the width direction in the vicinity of the continuous portion of the support member 32 is cut and raised so that the tip portion is directed to the terminal 5 side. A protrusion 33 is formed. A compression spring 8 is attached to the tip of the L-shaped projection 33. Thus, a washer and a spring-loaded screw (see FIG. 8), which are intermediate assemblies, are configured. In this case, the L-shaped projecting portion 33 is cut and raised from the support member 32, and the groove width of the cut and raised portion is a groove width smaller than the spring outer diameter of the compression spring 8, and The die is pulled out in the arrangement direction of the compression spring 8. As a result, as shown in FIG. 8, the L-shaped projection 33 is tapered so that the tip end portion of the L-shaped projection 33 becomes thinner, and the compression spring at the time of spring compression is formed. 8, and the L-shaped protrusion 33 (one-stage bent structure) is inserted into the inner diameter of the compression spring 8 so that the compression spring 8 is not easily caught by the L-shaped protrusion 33. In addition, when the spring is extended, the compression spring 8 is surrounded by a columnar shape or a prismatic shape by assembling it in a predetermined position (for example, a recess) of the unit 6 that constitutes, and the stability of the position of the compression spring 8 is secured. Yes.

  In this case, the screw 2 and the washer 3 may be caulked so that the screw 2 does not fall off the washer 3. The screw 2 and the washer 3 are not caulked, and the screw 2 and the washer 3 are inserted into the screw holding hole of the washer 3. The head of the screw 2 that is screwed up, the flat washer 21 and the like may be held from above by the screw holding portion 63 as will be described later. That is, the screw 2 and the washer 3 are separable (when the screw 2 is not crimped to the washer 3).

  A plurality of units 6 are connected in the thickness direction, and a wall member 61 having a vertical surface structure for insulation from adjacent units 6, the above-described screw 2, washer 3, terminal 5, nut 7 and compression spring. And a rib member 62 erected from the wall member 61 in order to accommodate 8.

  The unit 6 has a screw holding portion 63 that holds the screw 2 together with the washer 3 by the urging force of the compression spring 8. The screw holding portion 63 is provided on the ceiling portion of the unit 6, and a rib is provided for fixing the outer peripheral edge portion of the flat washer 21 by letting the pan-like head of the screw 2 escape through the hole in the ceiling portion of the unit 6. ing.

  Since the compression spring 8 is disposed behind the washer 3 and has a spring length, the outer diameter of the spring can be reduced. Therefore, the space of the spring portion can be reduced and the outer diameter of the spring is smaller than that of a normal spring. Since a large number can be taken, the spring sag can be reduced as compared with the conventional spring.

  Next, as a conventional power control switch, a basic structure of a cam switch as a changeover switch is disclosed in Patent Document 2. A conventional cam switch disclosed in Patent Document 2 will be described with reference to FIG.

  FIG. 9 is a plan view of a housing unit of a conventional cam switch.

  As shown in FIG. 9, in a conventional cam switch, an insulating rotating cam 101 having a cam groove 100 formed on the outer periphery is accommodated in a housing unit 102. The rotating cam 101 is configured so that a metallic shaft 103 is passed through a central square hole thereof and is rotatable together with the metallic shaft. A movable rod 105 having a movable contact 104 is brought into contact with the outer periphery of the rotating cam 101 in a state where it is urged by a contact spring 106. The fixed contact 107 is attached to the housing unit 102 so as to be opposed to the movable contact 104 and to be disposed closer to the rotating cam 101 than the movable contact 104. The fixed contact 107 is integrally connected to a wiring terminal 108 disposed outside the housing unit 102.

  The casing unit 102 has a stacked structure in which a necessary number of casing units 102 are connected in the thickness direction.

  A metallic shaft 103 (not shown) has a handle fixed to one end thereof and is rotatably supported by a bearing. As the metal shaft 103 rotates, the rotating cam 101 is rotated in each case unit 102 of the hierarchy, and the movable contact 104 and the fixed contact are made using the cam groove 100 provided on the outer periphery of the rotating cam 101. 107 is turned on / off according to the rotation angle of the rotary cam 101.

Japanese Patent No. 4116972 JP 2000-133088 A

  When the screw-up mechanism in the conventional screw-up type terminal block is to be applied on the wiring terminal 108 of the conventional cam switch, the conventional cam switch has a plurality of switch units each having a contact structure. Since the parts are stacked in the thickness direction, the switch unit itself is not so thick that the screw-up mechanism can be used, and the wiring terminal itself of the conventional cam switch is not large in area, It has been difficult to apply the screw-up mechanism in the conventional screw-up type terminal block 1 to the wiring terminal 108 of the cam switch in terms of size.

  The present invention solves the above-described conventional problems, and a screw-up unit that can use a screw-up mechanism for a wiring terminal of a switch such as a cam switch, a manufacturing method thereof, and a switch unit using the screw-up unit It is an object to provide a switch such as a changeover switch using the screw-up unit.

  The screw-up unit of the present invention includes a housing-like insulating block surrounding the periphery in a plan view, and a rear one side of a washer that is accommodated in the insulating block and can be held by fitting the neck of the screw with a holding hole. A screw washer formed with a protrusion protruding downward from an L-shaped bent portion bent in an L-shape upward from the other side, and received in the insulating block and engaged with the protrusion And a compression spring for urging the threaded washer portion in the screw-up direction, whereby the above object is achieved.

  Preferably, the insulating block in the screw-up unit of the present invention surrounds four sides of the quadrangular shape in a plan view, and two mounting projections whose tip portions bulge outward from each other protrude from the rear wall side. ing.

  Further preferably, the insulating block in the screw-up unit of the present invention surrounds four sides of the quadrangle in a plan view, and the slit portion that accommodates the L-shaped bent portion on the back wall side and can move up and down. And one end of the slit portion communicates with the washer housing portion, and a protrusion for preventing the L-shaped bent portion from coming off is formed on the opening entrance side of the slit portion. A circular hole for accommodating the compression spring is formed in the depth direction in the middle of the slit portion.

  Further preferably, in the screw-up unit of the present invention, the screw-up mechanism is configured by arranging the washer and the compression spring in the front-rear direction.

  The screw-up unit manufacturing method of the present invention is the above-described screw-up unit manufacturing method of the present invention, in which the compression spring insertion step of inserting the compression spring into the circular hole from above, and the washer together with the screw Insert the L-shaped bent part into the slit part, engage the protrusion of the L-shaped bent part with the compression spring, and insert it beyond the detent protruding part. A threaded washer part insertion step, which achieves the above object.

  The switch unit portion of the present invention includes a switch unit in which a fixed contact and a movable contact for turning on / off a switch are accommodated, and the fixed contact is integrally connected to a wiring terminal disposed outside the unit. And a cover member that covers the inside of the switch unit and the screw-up unit of the present invention that is arranged on the wiring terminal so as to be capable of being screwed up, thereby achieving the object.

  Preferably, the screw-up unit is detachably mounted on the side surface of the cover member in the switch unit of the present invention so as to correspond to the position of the wiring terminal.

  Further preferably, the screw-up unit is integrally formed on the side surface of the cover member in the switch unit of the present invention so as to correspond to the position of the wiring terminal.

  The switch according to the present invention is configured by stacking one or a plurality of the switch unit portions according to the present invention, thereby achieving the above object.

  In the switch according to the present invention, the above-described screw-up unit according to the present invention is mounted on the wiring terminal so as to be able to be screwed up, thereby achieving the above-described object.

  With the above configuration, the operation of the present invention will be described below.

  In the present invention, as a screw-up unit, a housing-like insulating block that surrounds the periphery in a plan view, and a rear portion of a washer that is accommodated in the insulating block and can be held by fitting the neck of the screw with a holding hole A screw washer having a protrusion protruding downward from an L-shaped bent portion bent in an L shape upward from one side and the other side, and is housed in the insulating block, and is engaged with the protrusion. And a compression spring that biases the threaded washer. The screw up unit may be mounted on the wiring terminal of the switch unit or the wiring terminal of the power control switch so that the screw can be screwed up, or the screw up unit may be mounted on the wiring terminal. You may arrange | position integrally.

  Accordingly, the screw washer is bent in an L shape from one side of the rear part of the washer to the other side in an L-shape and connected to the compression spring. Since the downsizing is realized by lowering the thickness, the switch unit portion of the switch such as a cam switch is not thick, and a small wiring terminal can be used as the screw-up mechanism.

  As described above, according to the present invention, the L-shaped bent portion of the washer abuts against the protrusion by the urging force of the compression spring to prevent the screw from being pulled out, and keeps the screw-up state and exhibits the screw-up function. The screw-up structure can be surrounded by an insulating block to exert the finger protection function of the insulator. In addition, the washer is bent upward in an L shape and connected to the compression spring, so the washer and the compression spring are arranged at the front and rear to lower the screw-up mechanism, thereby reducing the size of the cam. It is possible to prevent the screw-up mechanism from entering the wiring terminal side of the switch unit in a power control switch such as a switch, and the small size wiring of the switch unit of a power control switch such as an existing cam switch. This screw-up mechanism can be easily added to the terminal for use. In addition, the screw-up unit can be easily and quickly replaced even when the screw-up mechanism is damaged.

It is a principal part block diagram of the screw up unit in embodiment of this invention, Comprising: (a) is a top view of the screw up unit, (b) is a side view of the screw up unit, (c) is the screw up unit (D) is the AA line longitudinal cross-sectional view of the screw up unit of (a). (A)-(c) is an assembly perspective view which shows each assembly process in the case of assembling the screw up unit of FIG. (A)-(c) is an assembly perspective view which shows the assembly process of each cam switch which mounts | wears with the screw up unit of this embodiment. (A) And (b) is an assembly perspective view which shows the process of mounting | wearing with the screw up unit of FIG. 1 at the time of the assembly of the cam unit part of FIG. (A) And (b) is an assembly perspective view which shows the assembly process of a cam unit part in case the cover member and screw up unit of FIG. 4 are integrally formed. (A) And (b) is an assembly perspective view which shows the process of assembling a cam switch using the cam unit part of FIG. It is a perspective view at the time of seeing the conventional screw-up-type terminal block disclosed by patent document 1 from diagonally upward. It is a perspective view which shows the state which assembled the screw, washer, and compression spring of FIG. It is a top view of the housing | casing unit of the conventional cam switch.

  Embodiments of a screw-up unit and a power control switch using the same according to the present invention will be described below in detail with reference to the drawings.

  1A and 1B are configuration diagrams of a main part of a screw up unit according to an embodiment of the present invention, in which FIG. 1A is a top view of the screw up unit, FIG. 1B is a side view of the screw up unit, and FIG. A front view of the screw up unit, (d) is a longitudinal sectional view taken along line AA of the screw up unit of (a).

  1A to 1D, a screw-up unit 200 according to the present embodiment includes a housing-like insulating block 210 that surrounds four sides of a surrounding quadrangle in plan view, and a spuck as a washer means on a screw neck. And a screw 211 such as a pan screw formed by inserting a flat washer, a screw holding hole capable of holding the head by externally fitting the neck of the screw 211, and a washer bent upward in an L shape 212 and a direction in which one end is inserted into the protruding portion of the L-shaped bent portion 212a of the washer 212 and is separated from a screw hole of a wiring terminal of a cam switch (not shown) to be described later (perpendicular to the wide surface of the wiring terminal) ) And a compression spring 213 for urging the washer 212 upward.

  The housing-like insulating block 210 is made of an insulating resin material, and surrounds the front wall 201, the side wall 202, and the back wall 203 on the four sides of the quadrangle in plan view for finger protection. Further, the front wall 201 is lower in height than the side walls 202, so that the tool is easy to use. The lower end portion of the front wall 201 is vacant so that an insertion space d corresponding to at least two crimp terminals (the crimp portion is exposed to the outside but insulated by the resin) can be taken. Further, below the outer surface of the back wall 203, two large and small projecting portions 204, 205 for fitting and holding with one touch to an opening of a cam unit (not shown) of the cam switch project. The tip portions of the large and small protrusions 204 and 205 bulge outward, and the bulge portion at the tip is inserted and fitted into the opening of the cam unit by one-touch due to its springiness. In addition, a slit portion 206 for accommodating the L-shaped bent portion 212 a of the washer 212 together with the compression spring 213 is provided inside the back wall 203. At one upper end of the slit portion 206 on the inner surface of the rear wall 203, the L-shaped bent portion 212a of the washer 212 is accommodated in the slit portion 206 together with the compression spring 213, and then the L-shaped bent portion 212a is prevented from coming off. A protrusion 207 (claw portion) for locking to is provided.

  In this way, the insulating block 210 surrounds four sides of the quadrangle in a plan view, and two mounting parts whose front ends bulge outward from each other for engagement from the lower end side of the back wall 203 of the four sides. The protrusions 204 and 205 protrude. In addition, the insulating block 210 has a quadrangular shape in plan view, and a slit portion 206 is formed on the inner side of the back wall 203 so that the L-shaped bent portion 212a is accommodated and can be moved up and down. The side is in communication with the rectangular washer receiving portion 208, the slit portion 206 is formed with a protrusion 207 for loosening the L-shaped bent portion 212 a on the opening side, and a circular hole for receiving the compression spring 213 212b is formed in a part of the slit portion 206 in the depth direction.

  Thus, the washer 212 has an L-shaped bent portion 212a bent upward in an L-shape, and a protruding portion 212b protruding downward is provided at the central portion of the L-shaped bent portion 212a. ing. A compression spring 213 is inserted and held in the protrusion 212b. In this way, the washer 212 is bent upward in an L shape and connected to the compression spring 213, so that the washer 212 and the compression spring 213 are arranged in the front and rear to reduce the height of the screw-up mechanism and reduce the size. Has been realized. This prevents the screw-up mechanism from getting into the wiring terminal side of the cam unit portion of the cam switch, which will be described later, and this screw-up mechanism is attached to the wiring terminal of the cam unit portion as the switch unit portion of the existing cam switch. Can be added.

  An L-shaped bent portion that is accommodated in the insulating block 210 and extends upward from one side of the rear side of the washer 212 that can be held by fitting the neck portion of the screw 211 with a holding hole and bent to the other side in an L-shape. A protrusion 212b protruding downward from the center of 212a is formed to constitute a screw washer. The compression spring 213 is engaged with the protrusion 212b to urge the threaded washer portion upward (screw-up direction).

  With the above screw-up unit 200, a screw-up mechanism and a coverless finger protection function that prevents the finger from touching the charging part (the wiring terminal has a plurality of unitized and stacked cam switch wiring terminals). 600V) in actual use.

  This screw-up unit 200 has a block in which a screw-up mechanism and a finger protection structure are packaged as a retrofit, and the large and small protrusions 204 and 205 protruding from the rear wall 203 of the insulating block 210 are attached to the opening on the cam unit side by one touch. The screw-up function can be provided on the wiring terminal 108 of the cam switch.

  In this way, the cam unit can be fitted so that only the screw-up unit 200 can be replaced. This one-touch fitting may be performed when the cam switch is assembled, or may be performed during actual use after the cam switch is assembled.

  The assembly of the screw-up unit 200 of this embodiment will be described in detail with the above configuration.

FIG. 2A to FIG. 2C are assembly perspective views showing respective assembly steps when the screw-up unit 200 of FIG. 1 is assembled.
First, as shown in FIG. 2A, a compression spring 213 is inserted from one end into a circular portion 206a of the slit portion 206 on the upper surface of the housing-like insulating block 210.

  Next, as shown in FIG. 2 (b), the slit 206 of the housing-like insulating block 210 into which the compression spring 213 is inserted, and the protrusion 212 b of the L-shaped bent portion 212 a at the other end of the compression spring 213. While the compression spring 213 is pressed, the washer 212 together with the screw 211 is inserted into the washer insertion portion 208 on the upper surface of the housing-like insulating block 210.

  Further, as shown in FIG. 2 (c), the L-shaped bent portion 212a of the washer 212 is inserted into the slit portion 206, and is pushed over the locking protrusion 207 inside the back wall 203. At this time, the washer 212 is energized by the compression spring 213 together with the screw 211 to be spring-up, but is not restricted by the locking projection 207 and jumps out to the outside.

  As described above, as a manufacturing method of the screw-up unit 200, the screw-up unit assembling process includes the compression spring insertion process of inserting the compression spring 213 into the circular hole 206a from above, and the screwed washer part from above into the washer receiving part 208. With insertion, the protrusion 212b of the L-shaped bent portion 212a is engaged with the compression spring 213, and the L-shaped bent portion 212a is inserted into the slit portion 206 beyond the detent 207. A washer insertion step.

  Next, assembly of the cam switch 300 to which the screw up unit 200 of this embodiment is attached will be described.

  FIG. 3A to FIG. 3C are assembly perspective views showing respective assembly steps of the cam switch 300 to which the screw up unit 200 of the present embodiment is attached.

  First, as shown in the cam unit portion stacking step in FIG. 3A, the rotating cam 304 is accommodated in the cam unit portion 303 in which the cover member 302 is entrapped in the cam unit 301, and the connecting shaft 305 is passed through. The upper rotating cam 304 is connected to the lower rotating cam 304. Finally, the end plate 306 is passed through the connecting shaft 305, and the end of the rotating cam 304 is rotatably fitted into a bearing (not shown) at the center of the end plate 306, so that the end plate 306 is attached to the screw 307. And fix. In this way, the cam switch body 300 is assembled.

  Next, as shown in the screw-up unit mounting step in FIG. 3B, an opening 308 is formed between the upper side of the protruding base of the wiring terminal 309 in the cam unit 301 of the cam switch body 300 and the cover member 302. The large and small protrusions 204 and 205 protruding from the back surface 203 of the screw-up unit 200 are fitted into the opening 308 with one touch, and the screw-up unit 200 is mounted and held on the wiring terminal 309. . The process of mounting the screw-up unit 200 on each wiring terminal 309 is repeated, and as shown in FIG. 3C, the screw-up unit 200 is mounted on all the wiring terminals 309. Complete the assembly.

  In the assembly of the cam switch 310, after the cam switch body 300 is assembled, the screw up unit 200 is inserted into the opening 308, and the screw up unit 200 is additionally attached to the cam switch body 300. Not limited to this, the screw-up unit 200 may be mounted at the time of assembling the cam unit portion 303 with the cover member 302 held in the cam unit 301. At this time, the screw-up unit 200 itself may be attached. May also be assembled. This case is shown in FIGS. 4 (a) and 4 (b).

That is, as shown in FIG. 4A, before or after tying the cover member 302 to the cam unit 301 from above, the protrusions 204 and 205 of the screw-up unit 200 are inserted into the opening 308 of the cover member 302. Then, the cam unit portion 303A as shown in FIG. 4B is completed. If a plurality of the cam unit portions 303A are stacked together with the rotating cam 304, a cam switch having a desired contact configuration can be completed according to the type of the rotating cam 304.
The internal structure of the cam unit 301 in this case will be described with reference to FIG. As shown in FIG. 4A, an insulating rotating cam 304 (FIG. 3) having a cam groove formed on the outer periphery is rotatably accommodated in a housing unit 321, and a movable contact 322 is provided on the outer periphery of the rotating cam. The movable rod 323 having a contact with the contact spring 324 is brought into contact with the movable rod 323. The fixed contact 325 is attached to the housing unit 321 so as to be opposed to the movable contact 322 and disposed on the rotating cam 304 side of the movable contact 322. The fixed contact 325 is integrally connected to a wiring terminal 309 disposed outside the housing unit 321. As a result, the rotation cam 304 is rotated in each case unit 321 of the hierarchy in accordance with the rotation of the rotation cam 304 coupled to a handle (not shown), and the cam groove provided on the outer periphery of the rotation cam 304 is used. The movable contact 322 and the fixed contact 325 are turned on / off. The rotation cam 304 may be inserted between the movable bars 323 after the cover member 302 is attached.

  As described above, according to the present embodiment, the urging force of the compression spring 213 causes the L-shaped bent portion 212a of the washer 212 to come into contact with the protruding portion 207 (claw portion) to prevent the screw from being pulled up. In addition to exhibiting a screw-up function, this screw-up structure can be surrounded by an insulating block 210 to exhibit an insulator finger protection function. Further, the washer 212 is bent upward in an L shape and connected to the compression spring 213. Therefore, the washer 212 and the compression spring 213 are arranged in the front and rear to reduce the height of the screw-up mechanism, thereby reducing the size. As a result, the screw up mechanism can be prevented from entering the cam switch wiring terminal side of the cam switch, and this screw is also applied to the small wiring terminal of the cam unit portion of the existing cam switch. An up mechanism can be easily added. Further, the screw-up unit 200 can be easily and quickly replaced when the screw-up mechanism is damaged.

  In assembling the cam switch 310, after assembling the cam switch main body 300, the screw up unit 200 is inserted into the opening 308 of the cover member 302 so that the screw up unit 200 is attached to the cam switch main body 300. When the cam unit 301 is assembled by tying the cover member 302 in the cam unit 301, the screw up unit 200 is mounted. However, the present invention is not limited to this, and the cover member 302 and the screw up unit 200 are separated. Instead, they may be formed integrally from the beginning. This case is shown in FIGS. 5 (a) and 5 (b).

  That is, as shown in FIG. 5A, a cam member portion 303B as shown in FIG. 5B is obtained by tying a cover member 302A integrally provided with the screw-up unit 200 from above the cam unit 301. To complete. In this case, the cover member 302A is made of an insulating resin material in which the insulating block 210 is integrally formed with the cover member 302, and the screw 211, the washer 212, and the compression spring 213 are assembled and accommodated in the insulating block 210. Has been. If a plurality of the cam unit portions 303B are stacked together with the rotating cam 304, a cam switch having a desired contact configuration according to the type of the rotating cam 304 is completed. This is shown in FIGS. 6 (a) and 6 (b).

  That is, as shown in the stacking process of the cam unit portion 303B in FIG. 6A, the rotating cam 304 is accommodated in the cam unit portion 303B in which the cover member 302A is entangled in the cam unit 301, and the connecting shaft 305 is connected. The upper rotary cam 304 is connected to the lower rotary cam 304. Finally, the end plate 306 is passed through the connecting shaft 305, and the distal end portion of the rotating cam 304 is rotatably fitted in a bearing recess (not shown) at the center of the end plate 306, and the end plate 306 is screwed by a screw 307. To fix. Thus, if a plurality of cam unit portions 303B are stacked together with the rotating cam 304, a cam switch 310A having a desired contact configuration is assembled according to the type of the rotating cam 304.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  The present invention provides a screw-up operation that facilitates screw fastening work by moving (up) the screw together with a washer in a direction perpendicular to the terminal surface in a state where the screw is rotated and removed from the screw hole of the terminal. Screw-up unit having function and manufacturing method thereof, switch unit portion using this screw-up unit, switchboard such as nuclear power plant, thermal power plant and substation, control panel and monitoring panel using this screw-up unit In the field of switches such as changeover switches such as drum switches and cam switches, etc. used in the above, the L-shaped bent part of the washer abuts against the protruding part due to the biasing force of the compression spring, preventing the screw up state. Hold the screw-up function and hold the screw-up structure with an insulating block. It is possible to exert a fin guard protection function. In addition, the washer is bent upward in an L shape and connected to the compression spring, so the washer and the compression spring are arranged at the front and rear to lower the screw-up mechanism, thereby reducing the size of the cam. It is possible to prevent the screw-up mechanism from entering the wiring terminal side of the switch unit in a power control switch such as a switch, and the small size wiring of the switch unit of a power control switch such as an existing cam switch. This screw-up mechanism can be easily added to the terminal for use. In addition, the screw-up unit can be easily and quickly replaced even when the screw-up mechanism is damaged.

DESCRIPTION OF SYMBOLS 200 Screw up unit 201 Front wall 202 Side wall 203 Back wall 204,205 Projection part 206 Slit part 206a Circular part 207 Projection part 208 Washer insertion part 210 Insulation block 211 Screw 212 Washer 212a L-shaped bending part 213 Compression spring 300 Cam switch Main body 301 Cam unit 302, 302A Cover member 303, 303A, 303B Cam unit portion 304 Rotating cam 305 Connection shaft 306 End plate 307 Screw 308 Opening portion 309 Wiring terminal 310, 310A Cam switch 321 Housing unit 322 Movable contact 323 Movable rod 324 Contact spring 325 Fixed contact

Claims (10)

  A housing-like insulating block surrounding the periphery in a plan view, and the other in an L shape upward from one side of the rear part of the washer that is accommodated in the insulating block and can be held by fitting the neck of the screw with a holding hole A threaded washer part formed with a protrusion protruding downward from an L-shaped bent part bent to the side, and received in the insulating block, and engaged with the protrusion part to screw the threaded washer part A screw-up unit having a compression spring biased in the up direction.   2. The screw-up unit according to claim 1, wherein the insulating block surrounds four sides of a quadrangle in a plan view, and two mounting protrusions whose front ends bulge outward from each other protrude from the back wall side. .   The insulating block surrounds four sides of the quadrangle in a plan view, and a slit portion is formed on the back wall side so as to accommodate the L-shaped bent portion and move up and down. An end portion communicates with the washer accommodating portion, a protrusion for preventing the L-shaped bent portion from coming off is formed on the opening entrance side of the slit portion, and a circular hole for accommodating the compression spring The screw-up unit according to claim 1, wherein the screw-up unit is formed in the depth direction in the middle of the slit portion.   The screw-up unit according to claim 1, wherein the screw-up mechanism is configured by arranging the washer and the compression spring in the front-rear direction. It is a manufacturing method of the screw up unit according to claim 3,
A compression spring inserting step of inserting the compression spring into the circular hole from above; inserting the washer together with the screw into the washer receiving portion from above; and inserting the L-shaped bent portion into the slit portion. A screw-up washer unit inserting step of engaging the protruding portion of the L-shaped bent portion and inserting the protruding portion beyond the protruding portion of the detent. A switch unit in which a fixed contact and a movable contact for turning on and off the switch are accommodated, and the fixed contact is integrally connected to a wiring terminal disposed outside the unit;
A cover member covering the inside of the switch unit;
The switch unit part which has the screw up unit in any one of Claims 1-4 arrange | positioned so that a screw up is possible on this terminal for wiring.   The switch unit portion according to claim 6, wherein the screw-up unit is detachably attached to a side surface portion of the cover member so as to correspond to the position of the wiring terminal.   The switch unit portion according to claim 6, wherein the screw-up unit is integrally formed on a side surface portion of the cover member so as to correspond to the position of the wiring terminal.   A switch in which one or a plurality of switch unit portions according to claim 6 are stacked.   The switch by which the screw up unit in any one of Claims 1-4 is mounted on the terminal for wiring so that screw-up is possible.

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