JP5288626B2 - switch - Google Patents

Description

  The present invention relates to a switch having a contact mechanism capable of handling a large current.

  A conventional switch capable of handling a large current is generally a seesaw-type contact mechanism that opens and closes an electric circuit by moving a movable contact piece tilting with an operation of an operation unit so as to contact and separate terminals. In addition, in order to make it easier to cut the arc generated when breaking a large current, a contact mechanism that widens the contact gap by sliding the converter with a movable contact piece on the bottom surface by tilting the operating shaft (See Patent Document 1 below).

JP 2007-273316 A

  However, the above-described conventional switch has to be enlarged in order to widen the contact gap with a seesaw type contact mechanism. In addition, it is possible to widen the contact gap without increasing the size of the switch by sliding the converter having the movable contact piece on the bottom surface. Because of the operation, it was difficult to provide protection against electric shock when the basic insulation was destroyed. Here, basic insulation is basic insulation against electric shock, and is an insulation that may cause an electric shock when broken.

  Therefore, in view of the above situation, the present invention can secure a contact gap that can save a large current in a space-saving manner and can instantaneously cut an arc, and can protect against electric shock even when basic insulation is broken. An object is to provide a switch having a mechanism.

In order to achieve the above object, the present invention provides
[1] In a switch having a contact mechanism that opens and closes an electric circuit by contacting and separating a plurality of terminals arranged in a case with a movable contact piece, the movable contact piece is formed in a substantially arc shape, At both ends of the piece, projecting pieces are formed outwardly of the arc, and contacts are provided on the projecting pieces, and the movable contact pieces are provided by first and second movable contact piece covers provided with rotating shafts. The movable contact piece is sandwiched and rotated with the rotation shafts of the first and second movable contact piece covers as the fulcrum in accordance with the operation of the operation unit, so that the contact is in contact with the fixed contact formed on the terminal. The electrical circuit is opened and closed by separating.
[ 2 ] In the switch according to [ 1 ], the operation unit and the first movable contact cover or the second movable contact cover are loosely fitted, and the first movable contact cover and the case An elastic member is disposed between the movable contact pieces, and when the operation displacement of the operation portion exceeds a certain amount, the elastic member urges the movable contact piece in a direction to contact the terminal or a direction to open the terminal depending on an operation direction. It is characterized by

According to the present invention, the following effects can be achieved.
(1) Since the terminals are brought into contact with and separated from each other by rotation of the substantially arc-shaped movable contact piece, the contact gap can be widened in the same space as a general seesaw type contact mechanism.
(2) The operation unit and the first movable contact piece cover or the second movable contact piece cover are loosely fitted and the elastic member is disposed between the first movable contact piece cover and the case, thereby Regardless of the speed at which the part is operated, the movable contact piece does not rotate until the operation displacement of the operation part exceeds a certain amount, and when it exceeds a certain amount, the movable contact piece rotates instantaneously due to the bias of the elastic member. Since the driving speed of the operating portion and the opening / closing speed of the contact are not linked, and even if the operating portion is operated slowly, the contacts can be instantaneously connected and disconnected, so that the arc can be cut instantaneously.
(3) Due to the biasing of the elastic member disposed between the first movable contact piece cover and the case, a sufficient contact force can be ensured at the time of contact between the contact and the fixed contact.
(4) Since the contact gap can be widened and the arc can be cut instantaneously, it can be used to open and close a DC load where a large arc is generated.

It is a disassembled perspective view of the contact mechanism of the switch which shows the Example of this invention. It is a perspective view of the contact mechanism of the switch which shows the Example of this invention. It is a disassembled perspective view of the operation part of the switch which shows the Example of this invention. It is a perspective view of the operation part of the switch which shows the Example of this invention. It is a perspective view of the switch which shows the Example of this invention. It is a figure which shows operation | movement of the operation part of the switch which shows the Example of this invention. It is a figure which shows operation | movement of the contact mechanism of the switch which shows the Example of this invention. It is a figure which shows the contact mechanism of the switch which shows the Example of this invention, and the contact gap of a prior art example.

  In the present invention, the movable contact piece rotates in accordance with the operation of the operation unit, so that the terminals can be contacted and separated. Therefore, the contact gap can be widened in a space-saving manner.

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

  1 is an exploded perspective view of a contact mechanism of a switch showing an embodiment of the present invention, FIG. 2 is a perspective view of a contact mechanism of the switch showing an embodiment of the present invention, and FIG. 3 is an operation of the switch showing the embodiment of the present invention. 4 is an exploded perspective view of the switch, FIG. 4 is a perspective view of an operation part of the switch showing the embodiment of the present invention, FIG. 5 is a perspective view of the switch showing the embodiment of the present invention, and FIG. 6 is a switch showing the embodiment of the present invention. 6A is a diagram showing the operation of the operation unit, FIG. 6A is before the operation, FIG. 6B is in the middle of the operation, and FIG. 6C is when the operation is completed. FIG. 7 is a diagram showing the operation of the contact mechanism of the switch according to the embodiment of the present invention. FIG. 7 (a) is before operation, FIG. 7 (b) is in the middle of operation, and FIG. It's time. FIG. 8 is a diagram showing the contact mechanism of the switch according to the embodiment of the present invention and the contact gap of the conventional example. FIG. 8A is a diagram showing the contact state of the contact mechanism of the switch according to the embodiment of the present invention. 8 (b) shows the contact opening of the contact mechanism of the switch according to the embodiment of the present invention, FIG. 8 (c) shows the contact of the conventional seesaw type, and FIG. 8 (d) shows the conventional seesaw type. At the time of contact opening.

  1 and 2, 1 is a movable contact piece, 2 is a first movable contact piece cover, and 3 is a second movable contact piece that is fitted to the first movable contact piece cover 2 and sandwiches the movable contact piece 1. Cover 4, case 5, first movable contact cover 2 and tension spring hooked to case 4, terminal 6 disposed on case 4, 7 fitted to case 4 so as to cover terminal 6 A terminal cover 8 to be fitted, a case cover 8 to be fitted to the case 4, and a screw 9 to be screwed to the case 4. The movable contact piece 1 is formed by bending a plate-like conductive member into an arc shape, and projecting pieces 1a are formed at both ends of the arc toward the outer side of the arc. The projecting piece 1a has fixed contacts 6a and 6 Contacts 1b and 1c are provided to contact 6b, respectively. The first movable contact cover 2 is formed with a hooking projection 2a for engaging the tension spring 5 and a rotating shaft 2b, and the second movable contact cover 3 is formed with a rotating shaft 3a, and the rotating shaft 2b. And 3a as a center.

  When the movable contact piece 1 is engaged with the first movable contact piece cover 2 and the second movable contact piece cover 3 is fitted to the first movable contact piece cover 2, the movable contact piece 1 is sandwiched. . At this time, one of the tension springs 5 is hooked on the hooking protrusion 2 a of the first movable contact cover 2. Terminals 6 are disposed on the side surfaces of the case 4 so that the fixed contacts 6a and 6b protrude from the terminal insertion hole 4a to the inside of the case 4 and the fixed contact pieces 6c and 6d are disposed on the bottom surface of the case 4. The cover 7 is covered from the side of the case 4 on which the terminals 6 are disposed, and the fitting projection 4c formed in the recess 4b and the fitting hole 7b formed in the protruding piece 7a are fitted. The movable contact piece 1 sandwiched between the first movable contact cover 2 and the second movable contact cover 3 is disposed in the case 4 in which the terminal 6 is disposed. At this time, the first movable contact cover The second rotary shaft 2b is engaged with the bearing hole 4e and the bearing hole 7c, and the other of the tension springs 5 is hooked on the hooking protrusion 4d. The case cover 8 is covered with the case 4, and the fitting convex part 4g formed in the concave part 4f and the fitting hole 8b formed in the protruding piece 8a are fitted. At this time, the rotating shaft 3a of the second movable contact cover 3 is engaged with the bearing hole 8c. Then, the screw 9 is screwed into the case 4 from below the case 4 through the through holes 6e and 6f formed in the fixed contact pieces 6c and 6d, whereby the contact mechanism unit 14 is completed.

  3 and 4, 10 is a lever, 11 is a case, 12 is a tension spring hooked on the lever 10 and the case 11, and 13 is a case cover fitted to the case 11. The lever 10 is formed with a hooking hole 10a on which the tension spring 12 is hooked and a tilting shaft 10b that serves as a tilting fulcrum and transmits an operation to the contact mechanism. The case 11 is formed with a hooking projection 11a to which the tension spring 12 is hooked and a bearing hole 11b with which the tilting shaft 10b is rotatably engaged.

  The tension spring 12 is hooked on the hooking hole 10a of the lever 10 and the hooking protrusion 11a of the case 11, and the lever 10 is disposed in the case 11 so that the tilting shaft 10b is engaged with the bearing hole 11b. . The case cover 13 is covered with the case 11, and the fitting convex portion 11 d formed in the concave portion 11 c of the case 11 and the fitting hole 13 b formed in the protruding piece 13 a of the case cover 13 are fitted. At this time, the tilting shaft 10b of the lever 10 is engaged with the bearing hole 13c, and the engaging protrusion 11a of the case 11 is engaged with the engaging hole 13d, whereby the operation unit unit 15 is completed.

  Then, as shown in FIG. 5, the contact mechanism unit 14 and the operation unit unit 15 are coupled by coupling the coupling holes 4 h, 7 d, 8 d, 11 e, and 13 e of each component with the coupling pin 16. At this time, the switch 17 is completed by loosely fitting the rotating shaft 2b of the first movable contact cover 2 and the tilting shaft 10b of the lever 10.

  In the switch of the present invention configured as described above, as shown in FIGS. 6 and 7, when the lever 10 is operated in the right direction, the tilting shaft 10b rotates to the right. Since the tilting shaft 10b and the rotating shaft 2b of the first movable contact cover 2 are fitted with play in the rotating direction, the rotating shaft 2b does not rotate until the operation displacement of the lever 10 exceeds a certain amount. When the amount exceeds a certain amount, the rotating shaft 2b rotates. With this rotation, the movable contact piece 1 rotates, the contacts 1b and 1c of the movable contact piece 1 come into contact with the fixed contacts 6a and 6b of the terminal 6, respectively, and the terminals 6 are electrically connected. At this time, since the movable contact piece 1 is instantaneously rotated by the urging of the tension spring 5, the contact points are instantaneously contacted regardless of the operation speed of the lever 10, and sufficient contact force is ensured. It is locked by coming into contact with the stop projection 11f. Further, when the lever 10 is operated in the left direction, the tilting shaft 10b rotates to the left, and the rotation shaft 2b does not rotate until the operation displacement of the lever 10 exceeds a certain amount, similarly to the operation in the right direction. When a certain amount is exceeded, the rotating shaft 2b rotates. With this rotation, the movable contact piece 1 rotates, the contacts are separated, and the terminals 6 are opened. At this time, the movable contact piece 1 is instantaneously rotated by the biasing force of the tension spring 5, so that the contact gap is instantly ensured regardless of the operation speed of the lever 10. When the switch 17 is attached to a panel (not shown), a fixing hole 11g provided in the case 11 is screwed with a screw hole provided in the panel and a screw (not shown).

As described above, the switch shown in the present embodiment has a structure in which the contact is brought into and out of contact with the movable contact piece 1 as the lever 10 is operated. Therefore, as shown in FIG. It is much wider than the conventional seesaw type and has a feature that a contact gap that can handle a large current can be secured.
Further, the lever 10 and the first movable contact cover 2 are loosely fitted, and the operation portion is operated by the biasing force of the tension spring 5 disposed between the first movable contact cover 2 and the case 7. Regardless of the speed, the movable contact piece 1 does not rotate until the operation displacement of the operation unit exceeds a certain amount, and when the displacement exceeds a certain amount, the movable contact piece 1 rotates instantaneously. Since the switching speed is not linked, and the contacts 1b and 1c and the fixed contacts 6a and 6b can be instantaneously contacted / separated even if the operation unit is operated slowly, the arc can be instantaneously disconnected, and the contacts 1b and 1c and the fixed contact Sufficient contact force can be secured when 6a and 6b are in contact.

  In this embodiment, the operating portion is a lever that fits with the rotating shaft of the movable contact cover, but the operating portion rotates the movable contact piece as the support shaft rotates. The operation mode can be changed in various ways as long as the structure is adapted, and a slide or a rocker other than the lever may be used by changing the structure of the operation unit. In addition, the movable contact piece is shifted from the center of the case, but it may be downsized by placing it in the center of the case and reducing the surrounding space, and the terminal is integrated with the case by insert molding etc. The connection to the outside is a screw terminal, but it may be a solder terminal or a tab terminal. The attachment method to the panel may be one-touch attachment using a resin spring, and various methods are conceivable.

  In addition, this invention is not limited to said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.

  The switch of the present invention can be used as a switch having a contact mechanism capable of handling a large current.

DESCRIPTION OF SYMBOLS 1,101 Movable contact piece 1a Protrusion piece 1b, 1c, 101a, 101b Contact 2 1st movable contact piece cover 2a, 4d, 19a Hanging protrusion 2b, 3a Rotating shaft 3 2nd movable contact piece cover 4,11 Case 4a Terminal insertion hole 4b, 4f, 11c Concave part 4c, 4g, 11d Fitting convex part 4e, 7c, 8c, 11b, 13c Bearing hole 4h, 7d, 8d, 11e, 13e Coupling hole 5,12 Tension spring 6 Terminal 6a, 6b, 106a, 106b Fixed contact 6c, 6d Fixed contact 6e, 6f Through hole 7 Terminal cover 7a, 8a, 13a Projection piece 7b, 8b, 13b Mating hole 8, 13 Case cover 9 Screw 10 Lever 10a Latching hole 10b Tilt shaft 11f Locking projection 11g Fixing hole 13d Engagement hole 14 Contact mechanism unit 15 Operation unit 16 Coupling pin 17 Switch

Claims (2)

In a switch having a contact mechanism that opens and closes an electric circuit by contacting and separating a plurality of terminals arranged in a case with a movable contact piece, the movable contact piece is formed in a substantially arc shape, and both ends of the movable contact piece Has a projecting piece formed outwardly of the arc and a contact point is provided on the projecting piece, and the movable contact piece is sandwiched between first and second movable contact piece covers provided with a rotation shaft, The movable contact piece rotates with the rotation shafts of the first and second movable contact piece covers as a fulcrum in accordance with the operation of the operation unit, so that the contact is brought into and out of contact with the fixed contact formed on the terminal. A switch characterized by opening and closing the electrical circuit. 2. The switch according to claim 1 , wherein the operation portion and the first movable contact cover or the second movable contact cover are loosely fitted and elastic between the first movable contact cover and the case. A member is provided, and the elastic member biases the movable contact piece in a direction in which the movable contact piece comes into contact with the terminal or a direction in which the terminal is separated depending on an operation direction when an operation displacement of the operation unit exceeds a certain amount. Switch.

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