JP2012048908A - Spring load adjustment structure and spring load adjustment method of contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring load adjustment structure and a spring load adjustment method of a contact device which suppress an increase in the number of components while preventing an increase in the size of the contact device and which also suppress an increase in manufacturing costs.SOLUTION: A spring load adjustment structure of a contact device comprises: fixed terminals 33 each having a fixed contact 32; a movable contact piece 35 which has, on its upper face, movable contacts 34 making contact with and separating from the respective fixed contacts 32, and which has an insertion hole 35a formed thereon; a pressing spring 36 which has an upper end making contact with a lower face of the movable contact piece 35, and which expands and contracts in the vertical direction; a movable shaft 66 which is movably inserted into the insertion hole 35a and has a flange part 64 formed thereon; a sandwiching member 65 into which the movable shaft 66 is movably inserted, and sandwiches, together with the flange part 64, the pressing spring 36 and the movable contact piece 35; and driving means 2 which drives the movable shaft 66. A distance between the flange part 64 and the sandwiching member 65 is changed by moving the sandwiching member 65 in the vertical direction, and the sandwiching member 65 is fixed onto the movable shaft 66 at a position where a contact pressure of the pressing spring 36 against the movable contact piece 35 becomes a preset value.

Description

  The present invention relates to a spring load adjustment structure for a contact device and a spring load adjustment method.

  2. Description of the Related Art Conventionally, there has been provided a contact device that moves a movable shaft in the axial direction in accordance with ON / OFF operation of energization of an electromagnet block, and moves the movable contact to and from a fixed contact in conjunction with the movement of the movable shaft. . Here, the contact device applies an urging force toward the fixed contact to the movable contact in order to secure the contact pressure between the contacts when the movable contact is in contact with the fixed contact (when the contact is closed). It has a contact pressure spring.

  In recent years, since it is desired to reduce the size of the contact device, each component of the contact device is being reduced in size, and the contact pressure spring is also downsized. Here, a coil spring is generally used as the contact pressure spring, and the coil spring is disposed in a state in which the coil spring is contracted by a predetermined length from a natural length.

  When the size of the contact pressure spring is reduced, the contact pressure acting between the movable contact and the fixed contact decreases, so the contact pressure spring with a large spring constant is used while reducing the size. The pressure drop was suppressed.

  However, as the spring constant of the contact pressure spring is increased, the increase / decrease of the urging force is increased with respect to the change in the amount of expansion / contraction of the contact pressure spring. Therefore, if the compression amount (initial compression amount) of the contact pressure spring when the movable contact is separated from the fixed contact (when opening) is different for each contact device, the contact pressure (when opening) ( The initial contact pressure) varies. Therefore, there is a possibility that a contact device in which the contact pressure at the time of closing does not exceed a predetermined contact pressure may occur, and a stronger electromagnetic force can be generated in anticipation of variations in the contact pressure of each contact device. It was necessary to provide an electromagnet block in each contact device.

  However, increasing the size of the electromagnet block increases the size of the contact device, making it difficult to reduce the size of the contact device. Therefore, it has been necessary to equalize the initial compression amount of the contact pressure spring in each contact device to suppress variations in the spring load.

  Thus, as a spring load adjustment method for the contact pressure spring, there has been an adjustment method using a pair of bolts and a nut into which the bolts are screwed (see, for example, Patent Document 1).

  Further, as another adjustment method for adjusting the spring load of the contact pressure spring, there is an adjustment method using one or more spacers (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 49-14366 Japanese Utility Model Publication No. 61-1623

  However, in the above method using a pair of bolts and a nut into which the bolt is screwed, the number of parts is increased by providing the pair of bolts and nuts, and further, a space for storing the pair of bolts and nuts. There is a problem that the size of the contact device becomes large.

  Further, the above-described method using spacers has a problem in that the manufacturing cost increases because it is necessary to prepare a plurality of spacers in advance.

The present invention has been made in view of the above-described reasons, and its purpose is to suppress an increase in the number of parts and prevent an increase in the size of the contact device, and further to suppress an increase in manufacturing cost. A spring load adjusting structure of a contact device and a spring load adjusting method are provided.

  In order to solve the above problems, the spring load adjusting structure of the contact device according to the present invention has a fixed terminal having a fixed contact and a movable contact contacting and separating from the fixed contact on one side, and a movable contact in which an insertion hole is formed. A contact pressure spring that has one end abutting against the other surface of the movable contact, expands and contracts in the contact / separation direction of the movable contact, and biases the movable contact toward the fixed contact, and the movable contact A flange portion that contacts one surface is formed, a movable shaft that is movably inserted through the insertion hole of the movable contact, and the movable shaft is inserted into contact with the other end of the contact pressure spring. The movable shaft is connected to the movable shaft and the movable shaft so that the movable contact is in contact with and separated from the fixed contact. A spring load adjusting structure of a contact device comprising a driving means Any one of the collar part and the holding member is provided so as to be movable in the axial direction of the movable shaft, and the distance between the collar part and the holding member is changed by the movement, and the movable contact is performed. The contact pressure of the contact pressure spring to the child is fixed to the movable shaft at a position where a preset value is obtained.

  In the spring load adjusting structure of the contact device, the flange portion is fixed to the movable shaft, the holding member is provided to be movable in the axial direction of the moving shaft, and the holding member is attached to the movable shaft. The gap between the flange and the holding member is changed by moving in the axial direction, and the holding member is moved at a position where the contact pressure of the contact pressure spring with respect to the movable contact becomes a preset value. It is preferable to fix to the movable shaft.

  In the spring load adjusting structure of the contact device, the holding member is fixed to the movable shaft, the flange portion is provided to be movable in the axial direction of the movable shaft, and the flange portion is disposed on the movable shaft. The gap between the collar and the holding member is changed by moving the collar in the axial direction, and the collar is moved at a position where the contact pressure of the contact pressure spring with respect to the movable contact becomes a preset value. It is preferable to fix to the movable shaft.

  In order to solve the above problems, a spring load adjusting method for a contact device according to the present invention includes a fixed terminal having a fixed contact and a movable contact that contacts and separates from the fixed contact on one side, and a movable contact in which an insertion hole is formed. A contact pressure spring that has one end abutting against the other surface of the movable contact, expands and contracts in the contact / separation direction of the movable contact, and biases the movable contact toward the fixed contact, and the movable contact A flange portion that contacts one surface is formed, a movable shaft that is movably inserted through the insertion hole of the movable contact, and the movable shaft is inserted into contact with the other end of the contact pressure spring. The movable shaft is connected to the movable shaft and the movable shaft so that the movable contact is in contact with and separated from the fixed contact. A spring load adjustment method for a contact device comprising: Any one of the collar part and the holding member is provided so as to be movable in the axial direction of the movable shaft, and the distance between the collar part and the holding member is changed by the movement, and the movable contact is performed. The contact pressure of the contact pressure spring to the child is fixed to the movable shaft at a position where a preset value is obtained.

  In the spring load adjustment method of the contact device, the flange is fixed to the movable shaft, the holding member is provided movably in the axial direction of the movable shaft, and the holding member is attached to the movable shaft. The gap between the flange and the holding member is changed by moving in the axial direction, and the holding member is moved at a position where the contact pressure of the contact pressure spring with respect to the movable contact becomes a preset value. It is preferable to fix to the movable shaft.

  In this spring load adjusting method of the contact device, the holding member is fixed to the movable shaft, the flange portion is provided movably in the axial direction of the movable shaft, and the flange portion is connected to the axis of the movable shaft. The gap between the collar and the holding member is changed by moving in the direction, and the collar is moved at a position where the contact pressure of the contact pressure spring with respect to the movable contact becomes a preset value. It is preferable to fix to.

  The present invention provides a spring load adjustment structure and a spring load adjustment method for a contact device that can suppress an increase in the number of parts, prevent an increase in the size of the contact device, and further suppress an increase in manufacturing cost. can do.

The perspective view of the contact device in Embodiment 1 is shown. Sectional drawing of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The external view of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The disassembled perspective view of the electromagnetic relay provided with the contact apparatus in the same as the above is shown. The perspective view of the contact apparatus in Embodiment 2 is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The contact device of this embodiment is demonstrated using FIG. Note that the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIG. 1, the contact device of the present embodiment includes a fixed terminal 33 having a fixed contact 32, a movable contact 35 having a movable contact 34, a contact pressure spring 36, a movable shaft 66, and a pinching member. 65 and the electromagnet block 2.

  The fixed terminal 33 is formed in a substantially cylindrical shape by a conductive material such as copper, and the fixed contact 32 is fixed to the lower end. The fixed contact 32 may be formed integrally with the fixed terminal 33.

  The movable contact 35 is formed in a substantially rectangular flat plate shape, and movable contacts 34 are fixed to the left and right ends of the upper surface, respectively, and the movable contact 34 is disposed at a position facing the fixed contact 32 with a predetermined interval. The Further, the movable contact 35 is formed with an insertion hole 35a substantially at the center.

  The contact pressure spring 36 is formed of a coil spring, and is arranged with the axial direction thereof being directed in the vertical direction. A positioning convex portion (not shown) formed on the lower surface of the movable contact 35 is fitted into the upper end side inner diameter portion. Is positioned with respect to the movable contact 35.

  The holding member 65 is formed in a substantially rectangular flat plate shape, and a screw hole 65a is formed in the approximate center thereof, and the lower end of the contact pressure spring 36 is in contact with the approximate center of the upper surface.

  The movable shaft 66 is formed in a substantially rod shape that is long in the vertical direction, and a thread groove is formed at a substantially center in the axial direction to provide a threaded portion 66a. In addition, a substantially rectangular plate-shaped flange 64 protruding in the radial direction is formed at the upper end of the movable shaft 66. The movable shaft 66 is inserted through the movable contact 35, the contact pressure spring 36, and the holding member 65 in this order, and the screw portion 66a is screwed into the screw hole 65a of the holding member 65. Thereby, the lower surface of the collar part 64 contacts the upper surface of the movable contact 35, and the lower end of the contact pressure spring 36 contacts the upper surface of the holding member 65. Then, the movable contact 35 and the contact pressure spring 36 are held in the extending and contracting direction of the contact pressure spring 36 by the flange portion 64 and the holding member 65 of the movable shaft 66, and the contact pressure spring 36 is in a compressed state. Subsequently, the contact pressure spring 36 presses the movable contact 35 upward, and the movable contact 35 pressed upward is brought into contact with the flange portion 64 so that the movement toward the fixed contact 32 is restricted. Hereinafter, the contact pressure of the contact pressure spring 36 with respect to the movable contact 35 when the movable contact 34 is separated from the fixed contact 32 (at the time of opening) is referred to as initial contact pressure.

  Here, in the case where there are variations in the initial contact pressure among a plurality of contact devices, it is anticipated that a contact device in which the contact pressure between the contacts at the time of closing will be equal to or lower than a predetermined contact pressure will occur. Therefore, it is necessary to provide an electromagnet block capable of generating a larger electromagnetic force. However, in order to generate a larger electromagnetic force, there is a problem that the size of the electromagnet block needs to be increased, resulting in an increase in the size of the contact device.

  However, in the contact device of this embodiment, the initial contact pressure can be easily adjusted by rotating the holding member 65 around the axis. Hereinafter, a method for adjusting the initial contact pressure will be described.

  First, when the initial contact pressure before adjustment is equal to or less than a predetermined contact pressure, the pinching member 65 is rotated in one direction around the axis with respect to the movable shaft 66, and the pinching member 65 is moved upward to bring it closer to the collar 64. Further, when the initial contact pressure before adjustment is equal to or higher than a predetermined contact pressure, the holding member with respect to the movable shaft 66 is contrary to the case where the initial contact pressure is lower than the predetermined contact pressure. 65 is rotated in the other direction around the axis, and the holding member 65 is moved downward to move away from the collar portion 64.

  Then, the holding member 65 moves in the expansion / contraction direction (vertical direction) of the contact pressure spring 36, and the distance between the holding member 65 and the movable contact 35 changes. Along with this, the contact pressure spring 36 held between the holding member 65 and the movable contact 35 expands and contracts, and the value of the initial contact pressure changes. Subsequently, the rotation of the holding member 65 is stopped at a position where the initial contact pressure becomes a predetermined value, and the holding member 65 is fixed to the movable shaft 66. In this embodiment, a screw lock is used when fixing the screw hole 65a of the holding member 65 to the screw portion 66a of the movable shaft 66. However, the fixing method is not limited to this, and other methods such as welding are used. It may be.

  Thereby, the holding member 65 does not rotate with respect to the movable shaft 66, and the initial contact pressure is maintained at a predetermined value.

  As described above, in the contact device of the present embodiment, the movable shaft 66 and the holding member 65 constitute the spring load (initial contact pressure) adjustment structure and the spring load (initial contact pressure) adjustment method. Can be adjusted easily. In addition, by adjusting the initial contact pressure in each contact device, variation in the initial contact pressure in each contact device is suppressed, so that the electromagnet block 2 does not need to be increased in size and the enlargement of the contact device is prevented. Can do.

  Next, the operation of the contact device of the present embodiment configured as described above will be described. First, when the movable shaft 66 is displaced upward by the driving means 2, the collar portion 64 is also moved upward accordingly, and the restriction on the upward movement with respect to the movable contact 35 is released. Then, the movable contact 35 moves upward, the movable contact 34 comes into contact with the fixed contact 32, and the contacts are conducted. At that time, since the contact pressure of the contact pressure spring 36 with respect to the movable contact 35 is adjusted as described above, the contact pressure acting between the movable contact 34 and the fixed contact 32 in each contact device is substantially equal to each other. can do.

  In the contact device of this embodiment, the spring load adjusting structure and the spring load adjusting method are configured by the existing parts (movable shaft 66) and the second holding member 65. That is, the movable shaft 66 constituting the contact device also serves as a component part of the spring load adjusting means. Therefore, for example, unlike the conventional method for adjusting the initial contact pressure, there is no need to separately use bolts and nuts, and an increase in the number of parts of the contact device can be suppressed.

  Further, the spring load adjusting structure and the spring load adjusting method of the present embodiment can be adjusted to a predetermined initial contact pressure determined in advance by rotating the holding member 65 around the axis with respect to the movable shaft 66. After the initial contact pressure is adjusted, the adjusted initial contact pressure is maintained by stopping the rotation of the pinching member 65. Therefore, unlike the adjustment method using the spacer shown in the conventional example, it is possible to prevent an increase in manufacturing cost because no additional member is required to adjust the initial contact pressure and maintain the initial contact pressure after the adjustment. it can.

  The contact device of the present embodiment is used for an electromagnetic relay as shown in FIG. 2, for example.

  As shown in FIGS. 2 (a), 2 (b), 3 (a), 3 (b), and 4 (a) to 4 (c), the electromagnetic relay includes an electromagnetic block in a hollow box-shaped housing 4. (Drive means) The internal unit block 1 configured by integrally combining the contact block 2 and the contact block 3 is accommodated. Hereinafter, with reference to the vertical and horizontal directions in FIG.

  The electromagnet block 2 includes a coil bobbin 21 around which the excitation winding 22 is wound, a pair of coil terminals 23 to which both ends of the excitation winding 22 are connected, a fixed iron core 24 disposed and fixed in the coil bobbin 21, and a movable An iron core 25, a yoke 26, and a return spring 27 are provided.

  The coil bobbin 21 is formed in a substantially cylindrical shape with flange portions 21a and 21b formed at the upper and lower ends of a resin material, and an excitation winding 22 is wound around a cylindrical portion 21c between the flange portions 21a and 21b. The inner diameter on the lower end side of the cylindrical portion 21c is larger than the inner diameter on the upper end side.

  As shown in FIG. 4C, the excitation winding 22 has ends connected to a pair of terminal portions 121 provided on the flange portion 21 a of the coil bobbin 21, and via a lead wire 122 connected to the terminal portion 121. Are connected to a pair of coil terminals 23, respectively.

  The coil terminal 23 is made of a conductive material such as copper, and is connected to the lead wire 122 by solder or the like.

  As shown in FIG. 2A, the yoke 26 includes a yoke plate 26A disposed on the upper end side of the coil bobbin 21, a yoke plate 26B disposed on the lower end side of the coil bobbin 21, and the left and right sides of the yoke plate 26B. It is comprised from a pair of yoke plate 26C extended from the both ends to the yoke plate 26A side.

  The yoke plate 26A is formed in a substantially rectangular plate shape, and a recess 26a is formed in the approximate center of the upper surface side, and an insertion hole 26c is formed in the approximate center of the recess 26a.

  And the bottomed cylindrical cylindrical member 28 in which the collar part 28a is formed in the upper end is inserted in the insertion hole 26c, and the collar part 28a is joined to the recessed part 26a. Here, on the lower end side in the cylindrical portion 28b of the cylindrical member 28, a movable iron core 25 formed in a substantially columnar shape from a magnetic material is disposed. Further, a fixed iron core 24 that is formed in a substantially cylindrical shape from a magnetic material and faces the movable iron core 25 in the axial direction is disposed in the cylindrical portion 28b.

  Further, a substantially disc-shaped cap member 45 whose peripheral portion is fixed to the opening peripheral edge of the insertion hole 26c in the yoke plate 26A is provided on the upper surface of the yoke plate 26A, and the movable iron core 25 is prevented from coming off by the cap member 45. Is made. In addition, the cap member 45 has a concave portion 45a formed in a substantially cylindrical shape with its substantially center recessed upward, and a flange portion 24a formed at the upper end of the fixed iron core 24 is accommodated in the concave portion 45a.

  A cylindrical bush 26D made of a magnetic material is fitted into a gap formed between the inner peripheral surface on the lower end side of the coil bobbin 21 and the outer peripheral surface of the cylindrical member 28. The bushing 26 </ b> D forms a magnetic circuit together with the yoke plates 26 </ b> A to 26 </ b> C, the fixed iron core 24, and the movable iron core 25.

  The return spring 27 is inserted through the inner diameter 24 b of the fixed iron core 24, the lower end is in contact with the upper surface of the movable iron core 25, and the upper end is in contact with the lower surface of the cap member 45. Here, the return spring 27 is provided in a compressed state between the movable iron core 25 and the cap member 45, and elastically biases the movable iron core 25 downward.

  Next, the contact block 3 includes a case 31, a pair of fixed terminals 33, a movable contact 35, a contact pressure spring 36, a movable shaft 66, and a pinching member 65.

  The movable shaft 66 is formed in a substantially round bar shape that is long in the vertical direction, and screw grooves 66a and 66b are formed in a substantially central portion and a lower end side. The lower end side of the movable shaft 66 is inserted through the insertion hole 45b formed at the approximate center of the recess 45a in the cap member 45 and the return spring 27, and the threaded portion 66b is formed in the movable core 25 along the axial direction. Screwed into the screw hole 25a. Thereby, the lower coaxial 5 and the movable iron core 25 are connected.

  Further, as described above, the screw portion 66a on the upper end side of the movable shaft 66 is screwed into the screw hole 65a in the second holding member 65, and the upper end portion of the movable shaft 66 is substantially at the lower center of the first adjustment plate 64. Connected to.

  The case 31 is formed in a hollow box shape whose lower surface is opened from a heat-resistant material such as ceramic, and two through holes 31a are arranged in parallel on the upper surface.

  The fixed terminal 33 is formed in a substantially columnar shape by a conductive material such as copper, a flange 33a is formed at the upper end, and a fixed contact 32 is provided at the lower end. The fixed terminal 33 is inserted into the through hole 31 a of the case 31 and joined to the case 31 by brazing in a state where the flange portion 33 a protrudes from the upper surface of the case 31.

  As shown in FIG. 2A, one end of a flange 38 is joined to the peripheral edge of the opening of the case 31 by brazing. The other end of the flange 38 is joined to the first yoke plate 26A by brazing.

  Furthermore, an insulating member 39 for insulating an arc generated between the fixed contact 32 and the movable contact 34 from the joint between the case 31 and the flange 38 is provided at the opening of the case 31.

  The insulating member 39 is formed in a substantially hollow rectangular parallelepiped shape having an upper surface opened from an insulating material such as ceramic or synthetic resin, and the upper end side of the peripheral wall is in contact with the inner surface of the peripheral wall of the case 31. Thereby, the insulation between the contact portion composed of the fixed contact 32 and the movable contact 34 and the joint portion between the case 31 and the flange portion 38 is achieved.

  Furthermore, an insertion hole 39 b through which the movable shaft 66 is inserted is formed at the approximate center of the inner bottom surface of the insulating member 39.

  The housing 4 is formed of a resin material in a substantially rectangular box shape, and includes a hollow box-type housing main body 41 having an open upper surface, and a hollow box-type cover 42 covering the opening of the housing main body 41.

  The housing body 41 is provided with a protrusion 141 formed with an insertion hole 141a used for fixing the electromagnetic relay to the mounting surface by screwing at the front ends of the left and right side walls. Further, a step portion 41a is formed at the opening periphery of the upper end side of the housing main body 41, and the outer periphery is smaller than the lower end side. A pair of slits 41b into which the terminal portion 23b of the coil terminal 23 is fitted is formed on the front surface above the step portion 41a. Further, a pair of concave portions 41c are arranged in the left-right direction on the rear surface above the step portion 41a.

  The cover 42 is formed in a hollow box shape with an open bottom surface, and a pair of protrusions 42 a that fit into the recesses 41 c of the housing body 41 when assembled to the housing body 41 are formed on the rear surface. A partition 42c is formed on the upper surface of the cover 42 to divide the upper surface into two substantially right and left, and a pair of insertion holes 42b through which the fixed terminals 33 are inserted are formed on the upper surface divided into two by the partition 42c. It is formed.

  As shown in FIG. 4 (c), when the inner unit block 1 including the electromagnet block 2 and the contact block 3 is housed in the housing 4, the flange 21 b at the lower end of the coil bobbin 21 and the bottom surface of the housing body 41 are A substantially rectangular lower cushion rubber 43 is interposed therebetween. Then, an upper cushion rubber 44 in which an insertion hole 44 a through which the flange portion 33 a of the fixed terminal 33 is inserted is interposed between the case 31 and the cover 42.

  In the electromagnetic relay configured as described above, the movable iron core 25 slides downward due to the urging force of the return spring 27, and the movable shaft 66 moves downward accordingly. Accordingly, the movable contact 35 is pressed downward by the flange portion 64 and moves downward together with the flange portion 64. Therefore, in the initial state, the movable contact 34 and the fixed contact 32 are separated from each other.

  When the exciting winding 22 is energized and the movable iron core 25 is attracted to the fixed iron core 24 and slides upward, the movable shaft 66 connected to the movable iron core 25 also moves upward in conjunction with it. Thereby, the restriction | limiting of the upward movement with respect to the movable contact 35 by the collar part 64 of the movable shaft 66 is cancelled | released, and the movable contact 35 moves upwards. Then, the movable contact 34 comes into contact with the fixed contact 32 so that the contacts are electrically connected.

  When the energization of the excitation winding 22 is turned off, the movable iron core 25 slides downward by the urging force of the return spring 27, and the movable shaft 66 moves downward accordingly. Thereby, since the movable contact 35 also moves downward, the fixed contact 32 and the movable contact 34 are separated.

  And since the said electromagnetic relay is provided with the contact device of this embodiment, the contact pressure of the contact pressure spring 36 with respect to the movable contact 35 can be adjusted easily. Moreover, since the dispersion | variation in the contact pressure in each contact apparatus is suppressed, the size increase of an electromagnet block becomes unnecessary and the enlargement of an electromagnetic relay can be prevented.

(Embodiment 2)
The spring load adjusting structure and the spring load adjusting method of this embodiment will be described with reference to FIG. In the spring load adjusting structure and the spring load adjusting method of the first embodiment, the flange portion 64 of the movable shaft 66 is fixed to the movable shaft 66, and the holding member 65 is movably provided with respect to the movable shaft 66. . On the other hand, in the spring load adjustment structure and the spring load adjustment method of the present embodiment, the flange portion 67 of the movable shaft 68 is provided movably on the flange portion 68, and the holding member 69 is fixed to the movable shaft 68. . That is, the present embodiment and the first embodiment are different in that the movable shaft 68 is used instead of the movable shaft 66 and that the holding member 69 is used instead of the holding member 65. Since other configurations are the same as those in the first embodiment, the common structures are denoted by the same reference numerals and the description thereof is omitted.

  The movable shaft 68 is formed in a substantially round bar shape, and a shaft portion 681 in which a screw portion 68a is formed on the upper end side, and a screw hole 67a into which the screw portion 68a is screwed are formed in a substantially center. It is comprised from the collar part 67 provided so that a movement in the axial direction of the said shaft part 681 is possible.

  The flange portion 67 is formed in a substantially rectangular flat plate shape. The shaft portion 681 is inserted into the screw hole 67a, and the screw portion 68a is screwed into the screw hole 67a so as to face the substantially upper center of the movable contact 35.

  Further, a substantially rectangular flat plate-like holding member 69 protruding in the radial direction is formed from a substantially center in the axial direction of the shaft portion 681. Here, the holding member 69 is fixed to the shaft portion 681.

  In the movable shaft 68, the upper side of the shaft portion 681 is inserted through the inner diameter portion of the contact pressure spring 36, the insertion hole 35 a of the movable contact 35, and the screw hole 67 a of the flange portion 67 in order. As a result, the lower end of the contact pressure spring 36 comes into contact with the upper surface of the holding member 69, and the upper surface of the movable contact 35 comes into contact with the lower surface of the flange portion 67. Then, the movable contact 35 and the contact pressure spring 36 are sandwiched in the extending and contracting direction of the contact pressure spring 36 by the flange portion 67 and the flange portion 64, and the contact pressure spring 36 is in a compressed state to move the movable contact member 35 upward. Press. Then, the movable contact 35 pressed upward is brought into contact with the lower surface of the flange portion 67 and the movement toward the fixed contact 32 is restricted. Hereinafter, the contact pressure of the contact pressure spring 36 with respect to the movable contact 35 when the movable contact 34 is separated from the fixed contact 32 (at the time of opening) is referred to as initial contact pressure.

  And in the contact device of this embodiment which consists of the said structure, the said initial contact pressure can be easily adjusted by rotating the collar part 67 around an axis | shaft. Hereinafter, a method for adjusting the initial contact pressure will be described.

  First, when the initial contact pressure before adjustment is equal to or less than a predetermined contact pressure, the collar portion 67 is rotated in one direction around the axis with respect to the movable shaft 68, and the collar portion 67 is The collar 67 is moved downward to approach the holding member 69. Further, when the initial contact pressure before adjustment is equal to or higher than a predetermined contact pressure, contrary to the case where the initial contact pressure is equal to or lower than the predetermined contact pressure, the flange portion 67 with respect to the movable shaft 68. Is rotated in the other direction around the axis, and the flange portion 67 is moved upward to move the flange portion 67 away from the holding member 69.

  And the collar part 67 moves to the expansion-contraction direction (up-down direction) of the contact pressure spring 36, and the distance between the holding member 69 and the movable contact 35 changes. Accordingly, the contact pressure spring 36 held between the holding member 69 and the movable contact 35 expands and contracts, and the value of the initial contact pressure changes. Subsequently, the rotation of the flange portion 67 is stopped at a position where the initial contact pressure becomes a predetermined value, and the screw portion 68 a of the movable shaft 68 is fixed to the screw hole 67 a of the flange portion 67. In this embodiment, a screw lock is used when fixing the screw hole 67a of the flange portion 67 to the screw portion 68a of the movable shaft 68. However, the fixing method is not limited to this, and other methods such as welding are used. There may be.

  As a result, the collar 67 does not rotate with respect to the movable shaft 68, and the initial contact pressure is maintained at a predetermined value.

  As described above, in the contact device of this embodiment, the movable shaft 68 and the flange portion 67 constitute the spring load adjusting means, and the initial contact pressure can be easily adjusted. In addition, by adjusting the initial contact pressure in each contact device, variation in the initial contact pressure in each contact device is suppressed, so that the electromagnet block 2 does not need to be increased in size and the enlargement of the contact device is prevented. Can do.

  Next, the operation of the contact device of the present embodiment configured as described above will be described. First, when the movable shaft 68 is displaced upward by the driving means 2, the collar portion 67 is also moved upward, and the restriction on the upward movement with respect to the movable contact 35 is released. Then, the movable contact 35 moves upward, the movable contact 34 comes into contact with the fixed contact 32, and the contacts are conducted. At that time, since the contact pressure of the contact pressure spring 36 with respect to the movable contact 35 is adjusted as described above, the contact pressure acting between the movable contact 34 and the fixed contact 32 in each contact device is substantially equal to each other. can do.

  Further, in the contact device of the present embodiment, a spring load adjusting structure and a spring load adjusting method are configured by the existing parts (movable shaft 68) and the holding member 69. That is, the movable shaft 68 constituting the contact device also serves as a component of the spring load adjusting means. Therefore, for example, unlike the conventional method for adjusting the initial contact pressure, there is no need to separately use bolts and nuts, and an increase in the number of parts of the contact device can be suppressed.

  Further, the spring load adjusting structure and the spring load adjusting method of the present embodiment can be adjusted to a predetermined initial contact pressure determined in advance by rotating the collar portion 67 around the axis with respect to the movable shaft 68. After the initial contact pressure is adjusted, the adjusted initial contact pressure is maintained by stopping the rotation of the flange 67. Therefore, unlike the adjustment method using the spacer shown in the conventional example, it is possible to prevent an increase in manufacturing cost because no additional member is required to adjust the initial contact pressure and maintain the initial contact pressure after the adjustment. it can.

2 Electromagnet block (drive means)
32 fixed contact 33 fixed terminal 34 movable contact 35 movable contact 35a insertion hole 36 contact pressure spring 64 flange 65, 67 holding member 66, 68 movable shaft

Claims (6)

A fixed terminal having a fixed contact;
A movable contact that has a movable contact that contacts and separates from the fixed contact on one side, and an insertion hole is formed;
A contact pressure spring having one end abutting on the other surface of the movable contact, expanding and contracting in the contact / separation direction of the movable contact, and urging the movable contact toward the fixed contact;
A movable shaft that is formed with a flange that contacts one surface of the movable contact, and is movably inserted through the insertion hole of the movable contact;
A sandwiching member that is inserted through the movable shaft and abuts against the other end of the contact pressure spring, and sandwiches the contact pressure spring and the movable contact together with the flange in the extending and contracting direction of the contact pressure spring;
A spring load adjustment structure for a contact device, comprising: a drive means connected to the movable shaft, and driving means for driving the movable shaft so that the movable contact contacts and separates from the fixed contact;
Any one of the collar part and the holding member is provided so as to be movable in the axial direction of the movable shaft, and the distance between the collar part and the holding member is changed by the movement, and the movable contact is performed. A spring load adjustment structure for a contact device, wherein the contact pressure of the contact pressure spring with respect to a child is fixed to the movable shaft at a position where a preset value is obtained. The collar portion is fixed to the movable shaft,
The holding member is provided so as to be movable in the axial direction of the movable shaft, and the gap between the collar portion and the holding member is changed by moving the holding member in the axial direction of the movable shaft, The spring load adjustment of the contact device according to claim 1, wherein the holding member is fixed to the movable shaft at a position where a contact pressure of the contact pressure spring with respect to the movable contact becomes a preset value. Construction. The holding member is fixed to the movable shaft;
The collar portion is provided to be movable in the axial direction of the movable shaft, and the movable portion is moved in the axial direction of the movable shaft to change the interval between the collar portion and the holding member, thereby moving the movable portion. 2. The spring load adjustment structure for a contact device according to claim 1, wherein the flange is fixed to the movable shaft at a position where a contact pressure of the contact pressure spring with respect to the contact becomes a preset value. A fixed terminal having a fixed contact;
A movable contact that has a movable contact that contacts and separates from the fixed contact on one side, and an insertion hole is formed;
A contact pressure spring having one end abutting on the other surface of the movable contact, expanding and contracting in the contact / separation direction of the movable contact, and urging the movable contact toward the fixed contact;
A movable shaft that is formed with a flange that contacts one surface of the movable contact, and is movably inserted through the insertion hole of the movable contact;
A sandwiching member that is inserted through the movable shaft and abuts against the other end of the contact pressure spring, and sandwiches the contact pressure spring and the movable contact together with the flange in the extending and contracting direction of the contact pressure spring;
A spring load adjusting method for a contact device, comprising: a drive unit connected to the movable shaft and driving the movable shaft so that the movable contact is in contact with and away from the fixed contact;
Any one of the collar part and the holding member is provided so as to be movable in the axial direction of the movable shaft, and the distance between the collar part and the holding member is changed by the movement, and the movable contact is performed. A spring load adjusting method for a contact device, wherein the contact pressure of the contact pressure spring with respect to a child is fixed to the movable shaft at a position where a preset value is obtained. The collar portion is fixed to the movable shaft,
The holding member is provided so as to be movable in the axial direction of the movable shaft, and the gap between the collar portion and the holding member is changed by moving the holding member in the axial direction of the movable shaft, The spring load adjustment of the contact device according to claim 4, wherein the holding member is fixed to the movable shaft at a position where a contact pressure of the contact pressure spring with respect to the movable contact becomes a preset value. Method. The holding member is fixed to the movable shaft;
The collar portion is provided to be movable in the axial direction of the movable shaft, and the movable portion is moved in the axial direction of the movable shaft to change the interval between the collar portion and the holding member, thereby moving the movable portion. 5. The spring load adjusting method for a contact device according to claim 4, wherein the flange is fixed to the movable shaft at a position where the contact pressure of the contact pressure spring with respect to the contact becomes a preset value.

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