JP2007294264A - Contact device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equip with a contact pressure spring stably without polishing the contact pressure spring. <P>SOLUTION: The contact pressure spring 26 is provided between a movable contact 23 having a movable contact 230 that is made to contact and separate from a fixed contact 220 in a fixed terminal 22, and a stopper cap 25. The contact pressure spring 26 has a coil 260, and an end coil 261 extended inside from the upper end of the coil 260; and is provided by inserting a shaft 240 in a shaft 24 inside. The coil 260 is formed in a coil shape and is elastic, and energizes a movable contact 23 in a direction where the movable contact 230 comes into contact with the fixed contact 220. The end coil 261 is wound closely for a plurality of times, and is in contact with the movable contact 23 and the shaft 240 of the shaft 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a contact device suitable for, for example, a power load relay or an electromagnetic switch.

Conventionally, in this type of contact device, as shown in FIG. 13, the movable iron core 30 is moved in the vertical direction, and the fixed contact 310 provided on each of the pair of fixed terminals 31 and 31 and the movable contact 32. The contact between the contacts is turned on and off by making contact with the movable contact 320 which is the upper surface of the contact. This conventional contact device is provided with a coiled contact pressure spring 33 between a movable contact 32 and a stopper cap 34 facing the movable contact, and the contact pressure of the movable contact 32 is secured by the contact pressure spring 33. is doing. Patent Document 1 also discloses a sealed contact device that secures the contact pressure of the movable contact with a contact pressure spring as an example of a conventional contact device.
JP-A-11-232986 (pages 2 to 4 and FIG. 12)

  However, the contact pressure spring 33 of the conventional contact device has unevenness at the upper end 330 and the lower end 331 as shown in FIG. As a result, the conventional contact device has a problem that the installation of the contact pressure spring 33 on the movable contact 32 and the surface (stopper cap 34) (see FIG. 13) facing the movable contact 32 becomes unstable. there were. As a means for solving this problem, as shown in FIG. 14B, a method of removing the irregularities at the upper end 330 and the lower end 331 by polishing the upper end 330 and the lower end 331 of the contact pressure spring 33 so far. there were. However, when this method is used, there is a new problem that the cost increases.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a contact device that can stably include the contact pressure spring without polishing both ends of the contact pressure spring. There is.

  The invention according to claim 1 is a fixed terminal having a fixed contact, a movable contact having a movable contact contacting and separating from the fixed contact, and an insertion hole formed between the movable contacts, and moving to the insertion hole A shaft that is freely inserted, a movable shaft that is provided at one end of the shaft, and has a contact portion that contacts the movable contact in a direction in which the movable contact moves away from the fixed contact, and the movable contact is fixed Driving means for driving and moving the movable shaft so as to come into contact with and away from the contact, and is provided in a coil shape between the movable contact and a surface facing the movable contact. A coil portion that urges the movable contact in a direction in which the contact abuts the fixed contact; and a surface that extends inward from at least one end of the coil portion and faces the movable contact and the movable contact. Abuts at least one Characterized in that it comprises a contact pressure spring having a winding portion.

  According to this configuration, the contact surface of the end winding portion of the contact pressure spring can be formed in a substantially flat surface, so that the contact pressure spring can be stably provided without polishing the contact pressure spring. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the contact pressure spring is provided so as to pass through the shaft portion of the movable shaft so that the end winding portion contacts the shaft portion. It is characterized by touching. According to this structure, since a movable shaft can be hold | maintained by the end winding part of a contact pressure spring, an incorporating property can be improved. In addition, a spring receiving portion for restricting the position of the contact pressure spring is not necessarily required.

  According to a third aspect of the present invention, in the first aspect of the present invention, the contact pressure spring is connected to the inner side and one end of the end winding portion and is formed in a coil shape with the coil portion in common in the axial direction. And an inner coil portion. According to this structure, the freedom degree of spring design can be improved and contact pressure can be ensured easily. Further, the incorporation property can be improved as compared with the one using two springs.

  The invention according to claim 4 is the invention according to claim 3, wherein the inner coil portion has a length in the axial direction different from the coil portion. According to this configuration, since the inflection point of the spring load can be provided in the middle of the stroke of the contact pressure spring, it is possible to design a spring that can easily match the suction force.

  According to a fifth aspect of the present invention, in the invention according to the third or fourth aspect, the contact pressure spring extends inward from the other end of the inner coil portion so as to contact the shaft portion of the movable shaft. It has the inner end winding part which touches, It is characterized by the above-mentioned. According to this structure, since a movable part can be hold | maintained by the inner end winding part of a contact pressure spring, assemblability can be improved.

  According to the present invention, the contact pressure spring can be stably provided without polishing the contact pressure spring.

(Embodiment 1)
Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the contact device according to the first embodiment. FIG. 2 is an exploded perspective view of a main part of the contact device according to the first embodiment. FIG. 3 is a top view of the contact pressure spring of the first embodiment.

  First, the configuration of the first embodiment will be described. As shown in FIG. 1, the contact device according to the first embodiment includes a drive unit 1 and a contact unit 2.

  The drive unit 1 includes a coil block 10, a bobbin 11, a yoke 12, a yoke upper plate 13, a flange cap 14, a fixed iron core 15, a movable iron core 16, and a return spring 17. Configure. The driving unit 1 is a driving unit that drives and moves a shaft 24 described later so that a movable contact 230 described later contacts and separates from the fixed contact 220.

  The coil block 10 is a coil in which a plurality of coils are wound, and generates a magnetic flux when a current flows through the coil. The bobbin 11 has an annular cross-sectional cylindrical portion 110, a lower surface portion 111 provided to protrude outward from the lower end of the cylindrical portion 110, and an upper surface portion 112 provided to protrude outward from the upper end of the cylindrical portion 110. And integrated. Further, a through hole 113 is formed in the bobbin 11 along the vertical direction. In the bobbin 11, the coil block 10 is installed between the lower surface portion 111 and the upper surface portion 112.

  The yoke 12 is formed in a U-shaped cross section, and integrally includes a bottom surface portion 120 having a rectangular cross section and a side surface portion 121 extending upward from the outer peripheral end of the bottom surface portion 120. . A through hole 122 is formed at the center of the bottom surface portion 120. The yoke 12 houses the bobbin 11 on which the coil block 10 is installed, encloses the coil block 10 and allows the magnetic flux to pass through, and the magnetic circuit together with the yoke upper plate 13, the fixed iron core 15 and the movable iron core 16. Configure. The yoke upper plate 13 is formed in a rectangular shape with a metal magnetic material such as iron, and is fixed to the yoke 12 by caulking, for example. An insertion hole 130 is formed in the center of the yoke upper plate 13. This yoke upper plate 13 constitutes a magnetic circuit together with the yoke 12, the fixed iron core 15, and the movable iron core 16, and allows the magnetic flux to pass.

  The flange cap 14 is formed of a non-magnetic material, for example, in a bottomed cylindrical shape, and has a bottom surface portion 140 having a circular cross section and an annular cross section extending upward from the outer edge of the bottom surface portion 140. A cylindrical portion 141 and a flange 142 provided so as to protrude outward from the upper end of the cylindrical portion 141 are integrally provided, and are inserted into the through hole 113 of the bobbin 11 and the through hole 122 of the yoke 12. Further, the flange cap 14 stores the lower damper rubber 143 on the bottom surface portion 140. Such a flange cap 14 is airtightly joined in the vicinity of the insertion hole 130 of the yoke upper plate 13.

  The fixed iron core 15 is integrally provided with a columnar portion 150 having a circular cross section and an upper end portion 151 having a circular cross section provided so as to protrude outward from the upper end of the columnar portion 150. The fixed core 15 is formed with an insertion hole 152 along the vertical direction, and a recess 153 having an inner diameter larger than the inner diameter of the insertion hole 152 is formed at the lower end. In this fixed iron core 15, a cylindrical portion 150 is accommodated in the flange cap 14, and an upper end portion 151 is installed on the yoke upper plate 13 via an iron core lower rubber 154 (see FIG. 2). The movable iron core 16 is formed in a cylindrical shape and is housed on the bottom surface 140 side of the flange cap 14. An insertion hole 160 is formed in the movable iron core 16 along the vertical direction, and a recess 161 having an inner diameter larger than the inner diameter of the insertion hole 160 is formed at the lower end. Moreover, the movable iron core 16 has a facing surface 162 facing the fixed iron core 15 on the upper end side in the vertical direction. Further, the outer wall surface of the movable iron core 16 is a sliding surface 163 that slides on the inner peripheral surface of the flange cap 14. Such a movable iron core 16 is attracted by a suction force generated between the fixed iron core 15 through the magnetic flux.

  The return spring 17 is formed in a coil shape having an inner diameter slightly larger than the inner diameter of the insertion hole 152 of the fixed core 15 and has elasticity, and the upper end of the return spring 17 is fitted into the recess 153 of the fixed core 15 to be position-controlled. 1 is provided between the fixed iron core 15 and the movable iron core 16 in contact with the movable rubber 164 (see FIG. 2) at the lower end. The movable iron core 16 is urged in the direction).

  The contact portion 2 includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft (movable shaft) 24, a stopper cap 25, and a contact pressure spring 26. I have.

  The base block 20 is formed in a box shape with a heat resistant material such as ceramic. An opening 200 is formed in the lower surface of the base block 20. In addition, two through holes 202 and 202 are formed in the upper surface portion 201 of the base block 20. The joining member 21 is formed of, for example, a metal material. The joining member 21 is formed with a first joining portion 211 formed with an opening 210 and hermetically joined to the base block 20, and an opening 212 is formed. A second joint part 213 fixed to the upper plate 13 and hermetically joined, and a bent part 214 provided between the first joint part 211 and the second joint part 213 are integrally provided. The cross sections of the openings 210 and 212 of the bonding member 21 increase from the first bonding portion 211 to the second bonding portion 213. Further, the joining member 21 is hermetically joined to the base block 20 and the yoke upper plate 13, so that an airtight space 215 for accommodating a fixed contact 220 and a movable contact 230 described later is formed in the base block 20 and the yoke upper plate. 13 together. The hermetic space 215 is hermetically sealed with a gas of about 2 atm mainly containing hydrogen.

  Each fixed terminal 22 is formed in a bottomed cylindrical shape with a conductor such as a copper-based material, for example, and includes a fixed contact 220 at a lower end and a flange 221 integrally at an upper end. Each fixed terminal 22 has a lower end inserted through the through-hole 202 of the base block 20, and the flange 221 protrudes upward from the base block 20, and is fixed to the base block 20 by, for example, brazing and is airtightly joined. Yes. The fixed contact 220 is formed in a disk shape in cross section and is fixed to the fixed terminal 22 by, for example, brazing. The fixed contact 220 may be integrated with the fixed terminal 22.

  The movable contact 23 is formed of a conductor such as a copper-based material in a flat plate shape, and has an upper surface as the movable contact 230. That is, the movable contact 230 is integral with the movable contact 23. The movable contact 230 contacts and separates from the fixed contact 220. A concave spring receiving portion 231 is formed at the center of the lower surface of the movable contact 23. The spring receiving portion 231 is for regulating the position of the contact pressure spring 26, and the movable contact 23 is in contact with the contact pressure spring 26 at the spring receiving portion 231. An insertion hole 232 is formed in the center of the movable contact 23.

The shaft 24 is formed of, for example, a nonmagnetic material in a round bar shape (see FIG. 2), and includes a shaft portion 240 that is movably inserted into the insertion hole 232 of the movable contact 23, and a shaft portion 240. And a contact portion 241 that contacts the movable contact 23 in a direction away from the fixed contact 220 (downward direction in FIG. 1). In the shaft 24, the lower end of the shaft portion 240 is inserted into the insertion hole 160 of the movable iron core 16 and fixed to the movable iron core 16. Such a shaft 24 is moved by a suction force generated between the fixed iron core 15 and the movable iron core 16 when a magnetic flux passes through the fixed iron core 15 and the movable iron core 16. As a result, the shaft 24 moves the movable contactor 23.
The stopper cap 25 has a bottom surface portion 251 having an elliptical cross section (see FIG. 2) in which a circular opening 250 is formed, a cylinder portion 252 extending upward from the periphery of the opening 250 of the bottom surface portion 251, and a cylinder An upper surface portion 254 extending inwardly from the upper end of the portion 252 and having a through hole 253 formed thereon; a protrusion 255 extending upward from the periphery of the through hole 253 of the upper surface portion 254; and an upper surface portion 254 A ridge portion 256 provided so as to protrude downward is integrally provided. The stopper cap 25 is in contact with the yoke upper plate 13 at the bottom surface portion 251 and is in contact with the lower end of the contact pressure spring 26 at the upper surface portion 254. At this time, the upper end 151 of the fixed iron core 15 is accommodated in the opening 250, and the protrusion 256 comes into contact with the rubber on the iron core 155 installed on the upper end 151 of the fixed iron core 15. Further, the shaft portion 240 of the shaft 24 is inserted into the through hole 253.

  The contact pressure spring 26 includes a coil portion 260 provided between the spring receiving portion 231 of the movable contact 23 and the upper surface portion 254 of the stopper cap 25, and an end winding extending inward from the upper end of the coil portion 260. And a shaft portion 240 of the shaft 24 is provided therein. The coil portion 260 is formed in a coil shape and has elasticity, and biases the movable contact 23 in a direction in which the movable contact 230 abuts on the fixed contact 220 (upward direction in FIG. 1). A plurality of end winding portions 261 are wound closely (see FIG. 3), and are in contact with the spring receiving portion 231 of the movable contact 23 and the shaft portion 240 of the shaft 24. The number of turns of the coil part 260 and the number of turns of the end turn part 261 are not limited to those shown in FIGS.

  Next, operation | movement of the contact apparatus of Embodiment 1 is demonstrated using FIG. Before the coil block 10 is excited, the movable contact 230 faces the fixed contact 220 with a contact gap. When the coil block 10 is excited, the movable iron core 16 is attracted and moved by the fixed iron core 15, thereby driving the shaft 24 fixed to the movable iron core 16, and the movable contact 230 gradually increases the distance from the fixed contact 220. Shorten and contact the fixed contact 220. Thereafter, the spring load suddenly increases by the amount of the spring load of the contact pressure spring 26, and when the shaft 24 is further driven, the movable iron core 16 is moved by the amount of overtravel, and the spring load is further increased. The total distance between the contacts and the amount of overtravel is the stroke of the movable iron core 16. On the other hand, when the excitation of the coil block 10 is cut, the movable contact 23 is returned mainly by the urging force of the return spring 17 and displaced in reverse, and the movable contact 230 is separated from the fixed contact 220. At the same time, the movable iron core 16 also returns and returns to its original state.

  As described above, according to the first embodiment, the seating surface of the end winding portion 261 of the contact pressure spring 26 can be formed in a substantially flat surface, so that the contact pressure spring 26 is not polished without polishing the contact pressure spring 26. It can be provided in contact with the spring receiving portion 231 of the movable contact 23 stably. In addition, since the shaft 24 can be held by the end winding part 261, the assembling property can be improved.

  In addition, as a modification of the first embodiment, a movable contact in which a spring receiving portion for restricting the position of the contact pressure spring is not formed may be used. Even if it is such a structure, there exists an effect similar to Embodiment 1. FIG. Thereby, it is applicable also to the contact device which does not necessarily require a spring receiving part.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional view of the contact device according to the second embodiment. FIG. 5 is a diagram illustrating a spring load of the contact device according to the second embodiment.

  First, the configuration of the second embodiment will be described. As shown in FIG. 4, the contact device according to the second embodiment includes the drive unit 1 in the same manner as the contact device (see FIG. 1) according to the first embodiment, and also includes a contact portion 2 a. The contact portion 2a includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25, and the contact portion 2 (see FIG. 1), but has the following characteristic portions not included in the contact portion 2 of the first embodiment.

  The contact portion 2a includes a contact pressure spring 26a as shown in FIG. 4 instead of the contact pressure spring 26 (see FIG. 1) of the first embodiment. The contact pressure spring 26a is integrally provided with a coil portion 260, an end winding portion 261a extending inward from the upper end of the coil portion 260, and an inner coil portion 262 connected at the inner side and the upper end of the end winding portion 261a. ing. A plurality of end turns 261 a are wound closely, and are in contact with the spring receiver 231 of the movable contact 23. The inner coil portion 262 is formed in a coil shape having the same axial direction as the coil portion 260 (the vertical direction in FIG. 4), and has elasticity. The contact pressure spring 26a is the same as the contact pressure spring 26 of the first embodiment except for the points described above. Further, the number of turns of the coil part 260, the number of turns of the end coil part 261, and the number of turns of the inner coil part 262 are not limited to those shown in FIG.

  Next, the spring load of the contact device of Embodiment 2 is demonstrated using FIG. Prior to excitation of the coil block 10 (see FIG. 1), the movable contact 230 (see FIG. 1) faces the fixed contact 220 (see FIG. 1) with a contact gap. When the coil block 10 is excited, the movable iron core 16 (see FIG. 1) is attracted and moved by the fixed iron core 15 (see FIG. 1), so that the spring load changes from the point A to the point B. At this time, the change in the spring load is smaller than the conventional example (broken line in FIG. 5). When the movable contact 230 comes into contact with the fixed contact 220, the spring load increases rapidly from the point B to the point C. At this time, the increase in the spring load is larger than in the conventional example. That is, the contact pressure can be increased as compared with the conventional example. When the shaft 24 (see FIG. 1) is further driven, the movable iron core 16 is moved by the overtravel amount, and the spring load is slightly increased from the point C to the point D.

  As described above, according to the second embodiment, since the contact pressure spring 26a includes the coil portion 260 and the inner coil portion 262, the degree of freedom in spring design can be improved, and the contact pressure can be easily ensured. . Further, the incorporation property can be improved as compared with the one using two springs.

(Embodiment 3)
Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 6 is a cross-sectional view of the contact device of the third embodiment. FIG. 7 is a diagram illustrating a spring load of the contact device according to the third embodiment.

  First, the configuration of the third embodiment will be described. As shown in FIG. 6, the contact device according to the third embodiment includes the drive unit 1 in the same manner as the contact device according to the second embodiment (see FIG. 4), and also includes a contact portion 2b. The contact portion 2b includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25. The contact portion 2a of the second embodiment (see FIG. 4), but has the following characteristic portions that are not included in the contact portion 2a of the second embodiment.

  The contact portion 2b includes a contact pressure spring 26b as shown in FIG. 6 instead of the contact pressure spring 26a (see FIG. 4) of the second embodiment. The contact pressure spring 26b is integrally provided with a coil portion 260, an end winding portion 261a, and an inner coil portion 262a connected at the inner side and the upper end of the end winding portion 261a. The inner coil portion 262a is shorter in length in the axial direction (vertical direction in FIG. 6) than the coil portion 260. The contact pressure spring 26b is the same as the contact pressure spring 26a of the second embodiment in points other than the above. Further, the number of turns of the coil part 260, the number of turns of the end coil part 261a, and the number of turns of the inner coil part 262a are not limited to those shown in FIG.

  Next, the spring load of the contact device of Embodiment 3 is demonstrated using FIG. Before the excitation of the coil block 10 (see FIG. 1), the movable contact 230 (see FIG. 6) faces the fixed contact 220 (see FIG. 6) with a contact gap. When the coil block 10 is excited, the movable iron core 16 (see FIG. 1) is attracted and moved by the fixed iron core 15 (see FIG. 1), so that the spring load changes from the point A to the point B. At this time, both the coil portion 260 and the inner coil portion 262 a are in contact with the stopper cap 25 in the contact pressure spring 26. Thereafter, the spring load changes from point B to point C. At this time, only the coil portion 260 is in contact with the stopper cap 25 in the contact pressure spring 26. As a result, the change from point B to point C is smaller than the change from point A to point B. Thereafter, when the movable contact 230 comes into contact with the fixed contact 220, the spring load increases rapidly from the point C to the point D. Due to the change from the point A to the point D, the stroke of the movable iron core 16 can be made smaller than in the conventional example, and it becomes easier to match the suction force. When the shaft 24 (see FIG. 1) is further driven, the movable iron core 16 is moved by the amount of overtravel, and the spring load is slightly increased from the point D to the point E.

  As described above, according to the third embodiment, the inflection point of the spring load can be provided in the middle of the stroke of the contact pressure spring 26b by the lengths of the coil portion 260 and the inner coil portion 262a of the contact pressure spring 26b being different. As a result, it is possible to design a spring that easily matches the suction force.

(Embodiment 4)
The configuration of Embodiment 4 of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of the contact device of the fourth embodiment.

  As shown in FIG. 8, the contact device according to the fourth embodiment includes the drive unit 1 in the same manner as the contact device according to the third embodiment (see FIG. 6), and also includes a contact portion 2c. The contact portion 2c includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25, and the contact portion 2b (see FIG. 6), but has the following characteristic portions that are not included in the contact portion 2b of the third embodiment.

  The contact portion 2c includes a contact pressure spring 26c as shown in FIG. 8 instead of the contact pressure spring 26b (see FIG. 6) of the third embodiment. The contact pressure spring 26c integrally includes a coil part 260, an end coil part 261a, an inner coil part 262a, and an inner end coil part 263 extending inward from the lower end of the inner coil part 262a. The inner end winding part 263 is in contact with the shaft part 240 of the shaft 24. The contact pressure spring 26c is the same as the contact pressure spring 26b of the third embodiment in points other than the above. Further, the number of turns of the coil portion 260, the number of turns of the end winding portion 261a, the number of turns of the inner coil portion 262a, and the number of turns of the inner end turn portion 263 are not limited to those in FIG.

  As described above, according to the fourth embodiment, the shaft 24 can be held by the inner end winding portion 263 of the contact pressure spring 26c, so that the incorporation property can be improved.

(Embodiment 5)
The structure of Embodiment 5 of this invention is demonstrated using FIG. FIG. 9 is a cross-sectional view of a main part of the contact device according to the fifth embodiment.

  The contact device according to the fifth embodiment includes the drive unit 1 in the same manner as the contact device according to the first embodiment (see FIG. 1), and also includes a contact portion 2d as illustrated in FIG. The contact portion 2d includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25, and the contact portion 2 (see FIG. 1), but has the following characteristic portions not included in the contact portion 2 of the first embodiment.

  The contact portion 2d includes a contact pressure spring 26d as shown in FIG. 9 instead of the contact pressure spring 26 (see FIG. 1) of the first embodiment. 26 d of contact pressure springs are integrally provided with the coil part 260 and the end winding part 261b extended inward from the lower end of the coil part 260. As shown in FIG. The plurality of end winding portions 261b are closely wound and are in contact with the upper surface portion 254 of the stopper cap 25 and the shaft portion 240 of the shaft 24. The contact pressure spring 26d is the same as the contact pressure spring 26 of the first embodiment except for the points described above.

  As described above, according to the fifth embodiment, since the seat surface of the end winding portion 261b of the contact pressure spring 26d can be formed in a substantially flat surface, the contact pressure spring 26d can be mounted without polishing the contact pressure spring 26d. It can be provided in contact with the upper surface portion 254 of the stopper cap 25 stably. Moreover, since the shaft 24 can be hold | maintained by the end winding part 261b, assemblability can be improved.

(Embodiment 6)
The structure of Embodiment 6 of this invention is demonstrated using FIG. FIG. 10 is a cross-sectional view of a main part of the contact device according to the sixth embodiment.

  The contact device according to the sixth embodiment includes the drive unit 1 in the same manner as the contact device according to the first embodiment (see FIG. 1), and also includes a contact portion 2e as shown in FIG. The contact portion 2e includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25, and the contact portion 2 (see FIG. 1), but has the following characteristic portions not included in the contact portion 2 of the first embodiment.

  The contact portion 2e includes a contact pressure spring 26e as shown in FIG. 10 instead of the contact pressure spring 26 (see FIG. 1) of the first embodiment. The contact pressure spring 26e is integrally provided with a coil portion 260 and two end winding portions 261 and 261b. The plurality of end winding portions 261b are closely wound and are in contact with the upper surface portion 254 of the stopper cap 25 and the shaft portion 240 of the shaft 24. The contact pressure spring 26e is the same as the contact pressure spring 26 of the first embodiment except for the points described above.

  As described above, according to the sixth embodiment, since the seating surfaces of the end winding portions 261 and 261b of the contact pressure spring 26e can be formed in a substantially flat surface, the contact pressure spring 26e is not polished and is subjected to the above contact pressure spring. 26e can be stably provided in contact with the spring receiving portion 231 of the movable contactor 23 and the upper surface portion 254 of the stopper cap 25. Further, since the shaft 24 can be held by the two end winding portions 261 and 261b, the assembling property can be further improved.

(Embodiment 7)
The structure of Embodiment 7 of this invention is demonstrated using FIG. FIG. 11 is a cross-sectional view of a main part of the contact device according to the seventh embodiment.

  The contact device according to the seventh embodiment includes the drive unit 1 similarly to the contact device according to the first embodiment (see FIG. 1), and also includes a contact portion 2f as illustrated in FIG. The contact portion 2f includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25, and the contact portion 2 (see FIG. 1), but has the following characteristic portions not included in the contact portion 2 of the first embodiment.

  The contact portion 2f includes a contact pressure spring 26f as shown in FIG. 11 instead of the contact pressure spring 26 (see FIG. 1) of the first embodiment. The contact pressure spring 26f includes a coil portion 260, an end winding portion 261c extending inward from the lower end of the coil portion 260, an inner coil portion 262b connected at the inner side and the lower end of the end winding portion 261c, and an inner coil portion. The inner end winding part 263a extended inward from the upper end of 262b is provided integrally. A plurality of end turn portions 261 c are wound closely and are in contact with the upper surface portion 254 of the stopper cap 25. The inner coil portion 262b is formed in a coil shape having the same axial direction as the coil portion 260 (the vertical direction in FIG. 11) and has elasticity. Further, the inner coil portion 262b is shorter in the axial direction than the coil portion 260. The inner end winding part 263 a is in contact with the shaft part 240 of the shaft 24. The contact pressure spring 26f is the same as the contact pressure spring 26 of the first embodiment except for the points described above.

  As described above, according to the seventh embodiment, since the seating surface of the end winding portion 261c of the contact pressure spring 26f can be formed in a substantially flat surface, the contact pressure spring 26f can be formed without polishing the contact pressure spring 26f. It can be provided in contact with the upper surface portion 254 of the stopper cap 25 stably. In addition, since the shaft 24 can be held by the inner end winding portion 263a of the contact pressure spring 26f, the assembling property can be improved.

(Embodiment 8)
The configuration of the eighth embodiment of the present invention will be described with reference to FIG. FIG. 12 is a cross-sectional view of a main part of the contact device according to the eighth embodiment.

  The contact device according to the eighth embodiment includes the drive unit 1 in the same manner as the contact device according to the first embodiment (see FIG. 1), and also includes a contact portion 2g as illustrated in FIG. The contact portion 2g includes a base block 20, a joining member 21, a pair of fixed terminals 22, 22, a movable contact 23, a shaft 24, and a stopper cap 25, and the contact portion 2 (see FIG. 1), but has the following characteristic portions not included in the contact portion 2 of the first embodiment.

  The contact portion 2g includes a contact pressure spring 26g as shown in FIG. 12 instead of the contact pressure spring 26 (see FIG. 1) of the first embodiment. The contact pressure spring 26g includes a coil portion 260, an end winding portion 261a extending inward from the upper end of the coil portion 260, an end winding portion 261c extending inward from the lower end of the coil portion 260, and a seat. An inner coil portion 262c connected at the inner and upper ends of the winding portion 261a, an inner coil portion 262d connected at the inner and lower ends of the end winding portion 261c, and an inner end winding extending inward from the lower end of the inner coil portion 262c A portion 263b and an inner end winding portion 263c that extends inward from the upper end of the inner coil portion 262d and contacts the shaft portion 240 of the shaft 24 are integrally provided. A plurality of end turns 261 a are wound closely, and are in contact with the movable contact 23. A plurality of end turn portions 261 c are wound closely and are in contact with the stopper cap 25. The inner coil portion 262c is formed in a coil shape and has elasticity by sharing the axial direction (vertical direction in FIG. 12) with the coil portion 260. The inner coil portion 262 c is shorter in the axial direction than the coil portion 260. The inner coil portion 262d is formed in a coil shape having the same axial direction (vertical direction in FIG. 12) as the coil portion 260, and has elasticity. The inner coil portion 262d has an axial length shorter than that of the coil portion 260. The inner end winding part 263 b is in contact with the shaft part 240 of the shaft 24. The inner end winding part 263 c is in contact with the shaft part 240 of the shaft 24. The contact pressure spring 26g is the same as the contact pressure spring 26 of the first embodiment in points other than the above.

  As described above, according to the eighth embodiment, since the seat surfaces of the end winding portions 261a and 261c of the contact pressure spring 26g can be formed in a substantially flat surface, the contact pressure spring 26g is not polished and the contact pressure spring is not polished. 26 g can be stably provided in contact with the spring receiving portion 231 of the movable contactor 23 and the upper surface portion 254 of the stopper cap 25. Further, since the shaft 24 can be held by the two inner end winding portions 263b and 263c of the contact pressure spring 26g, the assembling property can be further improved.

It is sectional drawing of the contact apparatus of Embodiment 1 by this invention. It is a disassembled perspective view of the principal part in a contact device same as the above. It is a top view of the contact pressure spring same as the above. It is sectional drawing of the contact apparatus of Embodiment 2 by this invention. It is a figure which shows the spring load of a contact apparatus same as the above. It is sectional drawing of the contact apparatus of Embodiment 3 by this invention. It is a figure which shows the spring load of a contact apparatus same as the above. It is sectional drawing of the contact apparatus of Embodiment 4 by this invention. It is sectional drawing of the principal part in the contact apparatus of Embodiment 5 by this invention. It is sectional drawing of the principal part in the contact apparatus of Embodiment 6 by this invention. It is sectional drawing of the principal part in the contact apparatus of Embodiment 7 by this invention. It is sectional drawing of the principal part in the contact apparatus of Embodiment 8 by this invention. It is sectional drawing of the conventional contact apparatus. It is a contact pressure spring same as the above, (a) is a side view before polishing, (b) is a side view after polishing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive part 2, 2a-2g Contact part 22 Fixed terminal 220 Fixed contact 23 Movable contactor 230 Movable contact 232 Insertion hole 24 Shaft 240 Shaft part 241 Contact part 25 Stopper cap 26, 26a-26g Contact pressure spring 260 Coil part 261 , 261a to 261c End winding part 262, 262a to 262c Inner coil part 263, 263a, 263b Inner end winding part

Claims (5)

A fixed terminal having a fixed contact;
A movable contact having a movable contact contacting and separating from the fixed contact and having an insertion hole formed between the movable contacts;
A movable shaft having a shaft portion that is movably inserted into the insertion hole and a contact portion that is provided at one end of the shaft portion so that the movable contact contacts the movable contact in a direction away from the fixed contact;
Driving means for driving and moving the movable shaft so that the movable contact is in contact with and away from the fixed contact; and
A coil portion that is formed between the movable contact and a surface facing the movable contact, and that biases the movable contact in a direction in which the movable contact comes into contact with the fixed contact; A contact device comprising: a contact pressure spring that extends inward from at least one end of the coil portion and has a movable contact and an end winding portion that contacts at least one of the surfaces facing the movable contact. .   The contact device according to claim 1, wherein the contact pressure spring is provided so as to pass through the shaft portion of the movable shaft and is in contact with the shaft portion at the end winding portion.   2. The contact device according to claim 1, wherein the contact pressure spring includes an inner coil portion that is connected to the inner side and one end of the end winding portion and is formed in a coil shape in common with the coil portion in the axial direction. .   The contact device according to claim 3, wherein the inner coil portion has a length in the axial direction different from that of the coil portion.   5. The contact point according to claim 3, wherein the contact pressure spring includes an inner end winding portion that extends inward from the other end of the inner coil portion and contacts the shaft portion of the movable shaft. apparatus.

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