JP2008077976A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch having a switch mechanism consisting of a pair of fixed terminals, a movable member opposed to these, a plunger supporting the movable member, and a return spring to energize the plunger in which two kinds of switches having different contact specifications can be manufactured individually at low cost using identical components. <P>SOLUTION: The plunger is constructed capable of installing in any of a posture in which one end of the plunger 10 protrudes from an opening 12 of one side of a switch case 1 or a reverse posture in which the other end of the plunger 10 protrudes from an opening 13 of the other side of the switch case 1. Spring receptacle parts 15, 16 to receive one end of a return spring 11 are formed at the plunger 10 at two locations oppositely in movement direction of the plunger, and by receiving the other end of the return spring 11 of which one end is received at one of the spring receptacle parts 15, 16 by a spring support part 17 installed on the switch case 1, the plunger 10 is sliding energized to one side or the other side of the switch case 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a switch.

Conventionally, there are switches for opening and closing various electric circuits. For example, a movable and spring-biased plunger is equipped with a movable piece facing a fixed terminal, and the circuit is opened and closed by moving the plunger. A mechanism in which a mechanism is incorporated in a switch case is known (for example, see Patent Document 1).
JP 2003-45294 A

  For example, in the case of a single-pole single-throw switch, a pair of fixed terminals, a movable piece facing the fixed terminal, a plunger that supports the movable piece and moves in a direction away from the fixed terminal, and a plunger A switch is configured by incorporating a switching mechanism including a return spring biased in a certain direction into a switch case.

  In such a switch, the movable piece is separated from the fixed terminal in a state in which no operating force is applied to the plunger, and a normally open contact (both fixed terminals are brought into conduction by the movable piece being brought into contact with the fixed terminal by pushing the plunger) a contact) with a built-in switching mechanism, the movable piece comes into contact with the fixed terminal in a state where no operating force is applied to the plunger, and the movable piece is separated from the fixed terminal by pushing the plunger. A switch mechanism with a normally closed contact (b contact) specification that cuts off continuity will be manufactured, but the switch case and the fixed terminal of the switching mechanism can be shared by both contact specifications. Different parts corresponding to the two-contact specification will be used, and the number of parts will increase. Or with high cost of production, and to those parts management is troublesome.

  The present invention has been made paying attention to such a situation, and it is an object of the present invention to be able to manufacture two types of switches having different contact specifications at a low cost by sharing all the components.

  (1) A switch according to the present invention includes a switch case having a pair of fixed terminals, a movable piece that faces the fixed terminal, a plunger that supports the movable piece and moves in a direction away from the fixed terminal, and a plunger And a return spring for energizing the switch case, wherein two opposing faces of the switch case are formed with openings for projecting the plunger, and the plunger has an end at the switch case. The switch case can be mounted in either a posture protruding from the opening on one surface or a reverse posture protruding from the opening on the other surface of the switch case, and one end of the return spring is attached to the plunger. The return where the spring receiving portion to be received is formed at two locations, and one end is received by one of the two spring receiving portions. The other end of Ne, said receiving a spring support portion provided on the switch case, the plunger is intended to urge the one side or the other side of the switch case.

  According to the present invention, for example, by assembling the plunger in a posture in which one end portion of the plunger protrudes from the opening on the upper surface of the switch case, both ends of the return spring are connected to one spring receiving portion of the two spring receiving portions of the plunger and the switch. The plunger is urged to the upper surface side with respect to the switch case having the fixed terminal by being received by the spring support portion of the case, and thereby, for example, a normally closed contact specification switching mechanism can be configured, or By assembling the plunger in the reverse orientation where the other end of the plunger protrudes from the opening on the lower surface of the switch case, both ends of the return spring are connected to the other spring receiving portion of the two spring receiving portions of the plunger and the spring of the switch case. The plunger is received by the support portion, and the plunger is on the lower surface side with respect to the switch case having the fixed terminal. As a result, for example, a normally open contact type switching mechanism can be configured, and all components such as a switch case having a fixed terminal, a plunger, and a movable piece supported by the switch case are provided. It is possible to make a switch with a normally closed contact specification and a switch with a normally open contact specification separately.

  (2) In one embodiment of the switch of the present invention, the switch case includes a case body having a front surface opened, and a cover case coupled to the front surface of the case body. The spring support portion that receives the other end of the spring may be provided, and may be connected to the case body by reversing the direction in the movement direction of the plunger.

  According to this embodiment, the position of the spring support portion of the cover case is changed with respect to the return spring by properly using the connecting posture of the cover case with respect to the switch case, and the biasing direction of the plunger with respect to the switch case can be simplified. Can be selected in the opposite direction.

  (3) In a preferred embodiment of the switch of the present invention, the plunger is formed with an accommodating space for accommodating the return spring in a posture along the longitudinal direction of the plunger, and both end portions of the accommodating space are connected to the spring receiving portion. In addition, the spring support portion of the switch case is positioned on one end portion side of the housing space, and the spring support portion positioned on the one end portion side of the housing space and the spring receiving portion in the other end portion of the housing space In the meantime, the return spring may be mounted.

  According to this embodiment, the return spring can be accommodated in the plunger, and it is not necessary to provide a dedicated space for incorporating the return spring, which is effective for making the switch case compact.

  (4) In the embodiment of the above (3), the lateral width of the spring support portion is formed smaller than the outer diameter of the return spring, and the spring support portions are arranged in the movement direction of the plunger at both ends of the accommodation space. You may form the opening of the width | variety which can pass.

  According to this embodiment, the return spring is first assembled in the accommodation space of the plunger, and then the plunger incorporating the return spring is assembled to the cover case from the longitudinal direction of the plunger, so that the return spring is compressed and deformed while the cover case is compressed. The spring support portion can be positioned on one end side or the other end side of the return spring, so that the return spring can be easily assembled with initial deformation.

  (5) In another embodiment of the present invention, the movable piece may be elastically urged and supported by the plunger so as to be displaceable in the movement direction of the plunger.

  According to this embodiment, when the switching mechanism is configured as a normally open contact specification, even if the plunger is further pushed and moved after the plunger is slid against the return spring and the movable piece is brought into contact with the fixed terminal. The plunger is elastically retracted relative to the movable piece, so that the excessive stroke of the plunger can be easily absorbed. When the switching mechanism is configured as a normally closed contact type, the movable piece is elastically moved backward and is supported by the fixed terminal when the plunger is not pushed in. The movable piece is separated from the fixed terminal by being pushed in more than the amount.

  According to the present invention, by selecting the mounting orientation of the plunger with respect to the switch case in the forward and reverse directions, two types of switches configured with different contact specifications while sharing all the components can be made at low cost. .

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

  FIGS. 1A and 1B show the basic configuration of a single-pole single-throw type switch A configured with a normally closed contact (b contact) specification, and FIGS. A basic configuration of a single-pole single-throw type switch B configured in an open contact (a contact) specification is shown.

  These switches A and B are all configured by sharing all the components, and switching mechanisms 2A and 2B configured in two types of contact specifications are incorporated in a common switch case 1.

  Each of the switching mechanisms 2A and 2B includes a pair of fixed terminals 3 and 4 that are insert-fixed to the back wall of the switch case 1 with appropriate insulation intervals, and fixed contacts 5 that are provided at the ends of the fixed terminals 3 and 4. 6, a movable piece 9 made of a conductive metal plate provided at both ends with movable contacts 7 and 8 facing from below, a plunger 10 supporting the movable piece 9, and a coil-type return that slidably biases the plunger 10 upward And one end of the plunger 10 protrudes from an opening 12 formed on the upper surface of the switch case 1 or an opening 13 formed on the lower surface of the switch case 1, and both fixed terminals 3 and 4 are It protrudes from the back surface of the switch case 1 and is connected to an external conductor.

  As shown in the exploded perspective view of FIG. 2, the plunger 10 is formed with a recessed space 14 as a vertically long accommodating space opened forward, over the substantially entire length of the plunger 10. A return spring 11 is accommodated. The inner surfaces of the upper and lower ends of the recessed space 14 are spring receiving portions 15 and 16, and in the switch A, the upper end of the return spring 11 is received by the upper spring receiving portion 15 as shown in FIG. In the switch B, the lower end of the return spring 11 is received by the lower spring receiving portion 16 as shown in FIG.

  As shown in FIG. 2, the switch case 1 is composed of a box-shaped case main body 1a opened forward and a cover case 1b joined and connected to the front surface thereof. The engaging claw 1c extending from the end is engaged with the projections 1d provided on the left and right side surfaces of the case body 1a, and the cover case 1b is turned upside down as the direction of movement of the plunger 10 to reverse the case. It can be connected to the main body 1a. A spring support portion 17 having a lateral width smaller than the outer diameter of the return spring 11 protrudes from the inner surface of the cover case 1b at one end in the vertical direction. As shown in FIG. The cover case 1b is connected to the case main body 1a in the position positioned below, and the cover case 1b is connected to the case main body 1a in the position where the spring support portion 17 is positioned upward in the switch B.

  Openings 18 and 19 having a width smaller than the lateral width of the recessed space 14 are formed on the front sides of the upper and lower ends of the plunger 10. The openings 18 and 19 are formed in a width that allows the spring support portion 17 to pass up and down, and the return spring 11 is first assembled in the recessed space 14, and then the plunger 10 in which the return spring 11 is incorporated and the cover. By assembling the case 1b from the longitudinal direction of the plunger, the spring support part 17 is inserted into the recessed space 14 from one of the openings 18 and 19 formed at the upper and lower ends of the recessed space 14 from above and below, and the return spring 11 The lower end or the upper end of the return spring 11 can be supported by the spring support portion 17 while being compressed and deformed upward or downward.

  A cover A in a posture in which one end of the plunger 10 protrudes from the opening 12 by connecting the cover case 1b incorporating the plunger 10 to the front surface of the case main body 1a and assembling it across the openings 12 and 13 of the case main body 1a. And the switch B of the reverse orientation which made the other end of the plunger 10 protrude from the opening 13 can be made separately.

  That is, in the switch A, as shown in FIGS. 1A and 1B, the lower end of the return spring 11 is received by the spring support portion 17, and the upper end of the return spring 11 is connected to the spring receiving portion 15 on the plunger upper end side. By being received, the plunger 10 is slid upward and the movable piece 9 is received and contacted with the fixed terminals 7 and 8 to form a normally closed contact type switching mechanism 2A. In the switch B, as shown in FIGS. 1C and 1D, the upper end of the return spring 11 is received by the spring support portion 17, and the lower end of the return spring 11 is connected to the spring receiving portion 16 on the lower end side of the plunger. By being received, the plunger 10 is slid downward and the movable piece 9 is separated from the fixed terminals 7 and 8 to form a normally open contact type switching mechanism 2B.

  As shown in FIG. 3, the switches A and B configured as described above are in a state where the plunger 10 protrudes upward, that is, in a state where the switch B in FIGS. 1C and 1D is inverted. Exhibits exactly the same appearance, and can be used as a single-pole single-throw type single switch. In addition, each switch A and B can be used as two types of contact modules with different contact characteristics. FIGS. 4 and 5 show an example used for a multipole single throw type switch C for opening and closing a plurality of circuits.

  In the switch C, two switches A configured in a normally closed contact specification and one switch B configured in a normally open contact specification are arranged in parallel to the switch case 21 so that each plunger 10 protrudes upward. The plungers 10 of the switches A and B are arranged opposite to the free ends of the actuators 22 that can be swung around the fulcrum p, and the actuators 22 are swung by pushing the push buttons 23 so that all the plungers 10 are moved. The switching mechanisms 2A and 2B of the switches A and B are switched at the same time by pushing, and the switching mechanisms 2A and 2B are simultaneously returned by releasing the push button 23.

  Hereinafter, a more specific embodiment of the present invention will be described with reference to FIGS.

  In the following description, the same functional parts as those of the basic configuration described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 6 is a perspective view showing an appearance of a normally closed contact (b contact) type switch A in a posture in which the plunger 10 is protruded upward, and FIG. FIG. 7B is a vertical side view of the switch B configured by assembling the plunger 10 to the switch case 1 from below as described below.

  8 and 9 are exploded perspective views of the normally closed contact (b contact) specification switch A as viewed from the front and rear, respectively. FIGS. 10 and 11 are normally open contact (a contact) specifications. It is the disassembled perspective view which looked at the switch B of each from the front and back.

  7 (b), FIG. 10 and FIG. 11 show a state in which the operation surface of the plunger 10 is downward, but the plunger 10 is operated from above by reversing it up and down. be able to.

  In this embodiment, the movable piece 9 constituting the switching mechanisms 2A and 2B is supported by the plunger 10 as follows. That is, a concave portion 25 is formed in the upper and lower intermediate portion of the plunger 10 so as to extend rearward, and the support pin 26 projects downward from the upper surface of the concave portion 25. The movable piece 9 is positioned and placed on the upper surface of the support base 27, and the movable piece 9 and the support base 27 are inserted into the support pin 26 from below through the through holes 50 and 51, A spring 28 is interposed between the lower surface of the recess 25, and the movable piece 9 is slid upwardly by the spring 28.

  Further, the return spring 11 is assembled in the recessed space 14 of the plunger 10.

  In this embodiment, the normally closed contact (b contact) switch A shown in FIGS. 8 and 9 and the normally open contact (a contact) switch B shown in FIGS. The vertical direction of 1b is different from the assembly direction of the plunger 10 with respect to the cover case 1b.

  That is, in the normally closed contact (b contact) switch A, as shown in FIGS. 8 and 9, the spring support 17 of the cover case 1b is positioned on the lower side, and the movable piece 9 and the return spring 11 are assembled in advance. The plunger 10 is assembled from above, whereas in the normally open contact (a contact) specification switch B, as shown in FIGS. 10 and 11, the spring support 17 of the cover case 1b is positioned upward. The plunger 10 in which the movable piece 9 and the return spring 11 are pre-assembled is assembled from below.

  Thus, the switches A and B are configured by connecting the cover case 1b incorporating the plunger 10 to the front surface of the case body 1a.

  By configuring the switches A and B as described above, in the switch A, the plunger 10 is slid upwardly with respect to the switch case 1, whereas in the switch B, the plunger 10 is urged to slide downward with respect to the switch case 1.

  According to the above configuration, in the normally closed contact (b contact) type switch A, as shown in FIG. 7A, when the plunger 10 is not pushed in, it is biased upward by the spring 28 and supported by the plunger 10. The moved movable piece 9 is received and brought into contact with the fixed terminals 3 and 4 in a state where the movable piece 9 is moved backward and slightly downward from the upper surface of the concave portion 25, and the plunger 10 is slid to a position larger than the backward displacement amount of the movable piece 9. As a result, the movable piece 9 that has returned until it comes into contact with the upper surface of the recess 25 moves downward together with the plunger 10 and is separated from the fixed terminals 3 and 4.

  In the normally open contact (a contact) specification switch B, as shown in FIG. 7 (b), the movable piece 9 is received and supported by the upper surface of the recess 25 in a state where the plunger 10 is not pushed in. When the plunger 10 is largely slid upward, the movable piece 9 is contacted and supported by the fixed terminals 3 and 4, and the plunger 10 is further slid upward. When operated, the movable piece 9 supported in contact with the fixed terminals 3 and 4 is displaced backward relative to the plunger 10 against the spring 28, and only the plunger 10 moves downward. Stroke is absorbed.

[Other Examples]
(1) As shown in FIGS. 12 (a) and 12 (b), the spring receiving portions 15 and 16 that are formed in the plunger 10 so as to be closed at both ends and are not opened vertically are formed. It is also possible to form the spring support portion 17 inside the end portion of the recessed space 14. According to this, the entire end surface of the plunger 10 can be used as a pressing operation surface, which is effective in the case of the small plunger 10. In this case, as shown in FIG. 12C, a guide slope s is formed at the tip of the spring support 17 provided in the cover case 1b, and at the tips of the spring receiving portions 15 and 16 at both ends of the recessed space 14. Further, the guide slope t is formed, and the plunger 10 in which the return spring 11 is first assembled and the cover case 1b are relatively approached in an oblique direction, whereby a spring is provided between the spring receiving portion 15 and the end of the return spring 11. The support part 17 can be inserted.

  (2) In the specific embodiment described above, the movable piece 9 is supported by the plunger 10 so as to be reversibly displaceable by the spring 28 in order to absorb the excessive stroke of the plunger 10 when configured with the normally open contact specifications. However, for simplicity, the movable piece 9 may be formed of a spring plate and connected and fixed to the plunger 10 with both ends protruding, and the stroke of the plunger 10 can be exhibited by elastic deformation of the movable piece 9 itself. Is possible.

  (3) In the above embodiment, a single-pole single-throw type switch that opens and closes a single circuit has been illustrated. However, it can also be developed into a multi-pole type switch. The fixed terminal is provided, and a plurality of movable pieces 9 facing each fixed terminal pair are supported by the plunger 10, and by selecting the mounting posture of the plunger 10, two types of multi-pole type switches with the same component are provided. Obtainable.

  The present invention is useful as various switches.

The basic configuration of the switch is shown, (a) is a front view showing the internal structure of the switch configured in a normally closed contact specification, (b) is a longitudinal side view thereof, and (c) is a switch configured in a normally open specification. The front view which shows an internal structure, (d) is the vertical side view. It is the disassembled perspective view seen from the switch lower part of basic composition. It is the external appearance perspective view of a switch, (a) is what was comprised by the normally closed specification, (b) is what was comprised by the normally open specification. It is a front view of the switch comprised in the multi-pole single throw type combining the some switch. It is a vertical side view of the switch shown in FIG. It is a perspective view which shows the external appearance of the switch of a specific Example. The longitudinal side view of the switch of a concrete Example is shown, (a) is what was comprised by the normally closed contact specification, (b) was comprised by the normally open contact specification. It is the disassembled perspective view which looked at the switch comprised by a normally closed contact specification from the front. It is the disassembled perspective view which looked at the switch which comprises a normally closed contact specification from back. It is the disassembled perspective view which looked at the switch comprised by a normally open contact specification from the front. It is the disassembled perspective view which looked at the switch comprised by normally open contact specifications from back. The switch of another Example comprised by the normally closed contact specification is shown, (a) is a front view, (b) is a vertical side view, (c) is a vertical side view in the middle of an assembly | attachment.

Explanation of symbols

1 Switch case 1a Case body 1b Cover case 2A Switching mechanism (normally closed contact specification)
2B switching mechanism (normally open contact specification)
3 Fixed terminal 4 Fixed terminal 9 Movable piece 10 Plunger 11 Return spring 12 Opening 13 Opening 14 Recessed space (accommodating space)
15 Spring receiving portion 16 Spring receiving portion 17 Spring supporting portion

Claims (5)

A switch case having a pair of fixed terminals, a movable piece facing the fixed terminal, a plunger that supports the movable piece and moves toward and away from the fixed terminal, and a return spring that biases the plunger. A built-in switch,
On the two opposing surfaces of the switch case, an opening for protruding the plunger is formed, and the plunger has an end protruding from the opening on one surface of the switch case, or on the other surface of the switch case. It can be attached to the switch case in any posture of the reverse orientation protruding from the opening,
The plunger has two spring receiving portions for receiving one end of the return spring, and the other end of the return spring is received by one of the spring receiving portions of the two spring receiving portions. Is received by a spring support provided in the switch case, and the plunger is urged to one side or the other side of the switch case.   The switch case includes a case body having a front surface opened and a cover case coupled to the front surface of the case body, and the cover case is provided with the spring support portion that receives the other end of the return spring. The switch according to claim 1, wherein the switch can be connected to the case body by reversing the direction in the movement direction of the plunger.   The plunger has an accommodation space for accommodating the return spring in a posture along the plunger longitudinal direction, and both end portions of the accommodation space are used as the spring receiving portions, and the spring support portion of the switch case is used as the spring support portion. The return spring can be mounted between the spring support portion positioned at one end portion of the receiving space and positioned at the one end portion of the receiving space and the spring receiving portion at the other end portion of the receiving space. The switch according to 1 or 2.   The lateral width of the spring support portion is formed to be smaller than the outer diameter of the return spring, and openings having widths through which the spring support portion can pass in the movement direction of the plunger are formed at both ends of the accommodation space. 3. The switch according to 3.   The switch according to any one of claims 1 to 4, wherein the movable piece is elastically urged and supported by the plunger so as to be displaceable in a movement direction of the plunger.

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