JP4063007B2 - Rotation switch - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
  The present invention relates to a switch used for a door switch of a refrigerator, for example. More specifically, the present invention can realize a reduction in the number of parts and stable contact performance.RuIt relates to a rotary switch.
[0002]
[Prior art]
  In general, a switch used in home appliances, for example, a door switch incorporated in a household refrigerator, switches on / off a lamp in the refrigerator and turns on / off a cooling motor when the refrigerator door is opened / closed. It plays a role of function.
[0003]
  Furthermore, as a necessary condition of this door switch, when the door switch is mounted on a household refrigerator, the operation unit (actuator) to be pressed down is caused by a dimensional error between the outer shape of the door switch itself and the recessed shape of the refrigerator mounting position. ) Tends to be different, which makes it difficult to ensure the switch performance of the door switch due to excessive and insufficient strokes of the operation unit.
[0004]
  In order to stably turn on and off without being adversely affected by variations in the installation accuracy of this door switch, a long operation stroke is required in the operation direction, but at present, if a long operation stroke is adopted, the switch itself is large. There was a risk of damage to the switch parts due to over-stroke.
[0005]
  Also, depending on the door opening and closing method such as single-opening type and left-and-right opening type, the door switch operation direction also advances and retracts in the linear direction and push button type that performs switching operation, and rotation that rotates and rotates The types are known, and multiple types of contact structures corresponding to each type had to be prepared.
[0006]
  Furthermore, if switching of the contacts between the contact portions is slow during the switching operation, it may cause an arc and induce a contact failure. In order to prevent this contact failure, a snap action opening / closing mechanism for quickly switching between contact points and an opening / closing mechanism replacing it have been required.
[0007]
  In order to solve such a problem, the movable contact is tilted between a tilt position of about 45 ° and a vertical position with one end supported by the coil spring as a tilt fulcrum in conjunction with the pressing operation of the push button, A switch for switching between contact points is known (see, for example, JP-A-11-111105).
[Problems to be solved by the invention]
  However, such a switch requires a fixed contact, a movable contact, and a dedicated coil spring for returning the movable contact inside, which makes the internal contact structure complicated and also has elasticity when incorporated. The handling and assembling of the coil spring is poor, and the number of parts and the number of manufacturing steps are large, so there is a limit to cost reduction.
[0008]
  In addition, when switching between contact parts, the contact part of the movable contact rubs the contact part of the fixed contact and removes the oxide film while switching the contact point. It was easy.
[0009]
  In addition, when switching on / off the lamp that illuminates the interior of the refrigerator and turning on / off the cooling motor with a single door switch, a normally closed / normally open contact configuration that turns the switch on / off according to the opening / closing of the door A single-pole double-throw type is required, but in the case of a door switch that only turns the lamp on and off, or only switches the cooling motor on and off, the single pole with a normally closed contact configuration or a normally open contact configuration Easy to manufacture with a single throw type.
[0010]
  However, in the case of this single-pole single-throw type, the switch structure differs depending on whether it is a normally closed contact configuration or a normally open contact configuration, so the housing cannot be shared, and a housing corresponding to two types with different contact structures is prepared. I had to. Therefore, at present, a single-pole double-throw type door switch that can be switched to normally closed or normally open with a single switch structure is used as a single-pole single-throw door switch, and either contact configuration is selectively used according to the application. I am trying to use it properly.
[0011]
  However, when only one normally closed or normally open contact configuration is selectively used among such single pole double throw type switches, the contact configuration on the other non-use side is not used at all. This is an uneconomical door switch in which the contact parts are still incorporated, which is expensive in terms of cost.
[0012]
  For this reason, it may be possible to omit the unused contact parts in advance, but in this case, a space space in which the unused contact parts are omitted is generated in the housing, and the movable contact piece facing this space space is created. As a result, the proper amount of movement cannot be obtained, such as excessive tilting. As a result, the contact structure is unbalanced, such as the movable contact piece being displaced, and the contact performance is liable to break down. Therefore, in this case, a correction member such as a dummy contact for preventing the movable contact piece from being tilted excessively is required, and in the case of a switch that is mass-produced, the addition of one part greatly affects the manufacturing cost. Therefore, the development of a switch with reduced dummy contacts has been desired.
[0013]
  Therefore, the present invention can be provided as a single common part having both the function of the movable contact piece itself and the spring function of elastic displacement in addition to the contact function, thereby reducing the number of parts and reducing the cost. High reliability that can improve downsizing and assemblability, and can ensure good contact performance by snap action and extend lifeTimesAn object is to provide a dynamic switch.
[0014]
[Means for Solving the Problems]
  According to the present invention, a concave housing having an opening on one side and a cover for closing the opening surface are provided, and a conductive fixed contact piece and a movable contact piece are provided in the housing and held in the housing. To be operatedLever pressing forceIn addition to the movable contact piece, and the movable contact piece is moved and displaced to switch the contact portion between and away from each other, and the housing includes a common fixed contact piece, a common fixed contact piece, Are arranged in parallel with another fixed contact piece, arranged perpendicular to the parallel arrangement direction of the fixed contact pieces, and urged against the common fixed contact piece side to be tilted freely supported in the orthogonal direction. A tilting fulcrum portion at a U-shaped one-sided intermediate position where the conductive leaf spring material is bent, and the one-sided longitudinal end portion of the one-sided side with respect to the tilting fulcrum portion in the movable displacement direction. A movable contact piece having a contact portion is provided, and the tilting fulcrum portion of the movable contact piece is always in contact with the common fixed contact piece, the contact portion of the fixed contact piece and the contact portion of the movable contact piece facing each other With the other side of the movable contact piece. The contact along the face length side directionLever pressing forceProvided with a contact switching mechanism for switching the movable contact piece in a seesaw shape based onA lever that is pivotally attached to the housing incorporating the contact switching mechanism and is urged outwardly by a return spring is provided, and the base end of the lever at the time of turning or returning of the lever is provided. An arc-shaped projection formed in a projecting manner along the rotation direction presses and retreats the other side of the movable contact piece, and elastically displaces the movable contact piece to move to one side of the movable contact piece. Switch the formed contact part by inverting it to one side of the fixed contactIt is characterized by that.
[0015]
  hereRotationThe switch can be applied to a door switch of a refrigerator that is turned on / off in accordance with a door opening / closing operation.
[0016]
  The housing has a concave hollow portion into which a switch component is incorporated, and can be made of a synthetic resin material suitable for molding and insulation. Further, when mounting the component parts of the switch to the housing, the switch can be easily assembled from the opening having one concave surface opened. After this assembly, the opening surface of the housing can be covered with a flat cover and can be easily closed and assembled.
[0017]
  The fixed contact piece can be formed by punching from a conductive plate. For example, it can be provided by punching in the shape of an elongated piece having a contact portion on one side and a wiring connection portion on the other side.
[0018]
  The movable contact piece can be formed by bending a conductive leaf spring material into a U shape. Among these, one side of the U-shape is provided on the contact portion side, and the other side is provided on the operating force pressure receiving surface side. In addition, the contact portion and the spring portion can be configured by separate members in which materials are partially changed in consideration of increasing the switching current or extending the life. For example, a highly conductive material can be used for the contact portion, a highly elastic spring material can be used for the spring portion, and both parts can be joined in a U shape by caulking or the like.
[0019]
  SaidleverIs biased by a return springleverThe outer end of the housing protrudes outward from the housing and is held so that it can be pressed down.When pressed, it is guided to press down so as to be immersed in the housing and switch between the contact parts. It can be composed of a suitable synthetic resin material.
[0020]
  The contact portion may be formed integrally with the movable contact piece and the fixed contact piece, or may be configured by attaching a conductive contact member.
[0021]
  The tilting fulcrum portion can be formed by integrally forming a concave portion or a convex portion at an intermediate position on one side of the movable contact piece.
[0022]
  The contact switching mechanism refers to a single movable contact piece that is arranged in a perpendicular direction with respect to a plurality of fixed contact pieces arranged in parallel so as to be freely tilted in a seesaw shape. By receiving and reversing in a seesaw shape, it is possible to switch between the contact portions of the movable contact piece and the fixed contact piece.
[0023]
  According to the present invention, since the contact switching mechanism of the seesaw structure that reverses the movable contact piece in accordance with the switching operation is provided, the movable contact piece itself has both the original contact function and the return spring function of the movable contact piece. As a shared part, the number of parts can be reduced and the number of assembly steps can be reduced, and the simplification of the internal structure can reduce the cost and the space saving.
[0024]
  In particular, when incorporating into the housing, a plurality of fixed contact pieces are arranged in parallel in the housing, so that it can be efficiently aligned and attached to the internal space of the housing without requiring a wasteful arrangement space. For example, when three fixed contact pieces are assembled, they can be compactly assembled by aligning them in three rows.
[0025]
  Also, the movable contact piece is suitable for miniaturization because it has a small shape as if it was provided in a U-shape and folded, and the two pieces with the U-shaped bend at the apex are elastically displaced in opposite directions. Since sufficient elasticity can be obtained, an accurate spring function can be obtained while being small. Furthermore, since the movable contact pieces are orthogonally arranged in the parallel direction of the fixed contact pieces so as to be capable of contacting each fixed contact piece, it is suitable for an intensive contact portion arrangement structure and an efficient arrangement configuration. I can plan.
[0026]
  Also, along the outer surface longitudinal direction of the other side of the U-shaped movable contact pieceleverTherefore, the operation member will be in contact with the long side in the longitudinal direction on the other side,leverThe operation length (operation stroke) can be made sufficiently long. Since the operation stroke can be made longer during the switching operation in this way, if the contact switching region is set within the range of the operation stroke, there is no adverse effect due to variations in switch mounting accuracy. For this reason, the shortage of strokes can be resolved and turned on and off reliably, and excessive strokes are allowed and there is no risk of breakage of the switch parts.
[0027]
  Also, when switching the contacts, the movable contact piece itself is bent into a U shape with a leaf spring material, and a snap is formed by applying elasticity that vigorously reverses the bent leaf spring material into a seesaw shape. Since the contact is switched by operation, quick switching is possible, and arcing between the contact portions can be prevented. As a result, good contact performance that eliminates the occurrence of arcs can be obtained, and a reliable and stable switch can be obtained.
[0028]
  The support structure for allowing the above-mentioned movable contact piece to be reversed in a seesaw shape is formed such that one of the tilting fulcrum portion on the movable contact piece side and the fixed fulcrum portion on the common fixed terminal side for receiving this is a concave portion and the other is a convex portion. Therefore, it is suitable because a stable tilting operation can be obtained with a simple configuration.
[0029]
  Furthermore, this contact switching mechanism can be configured with a simple movement that reverses the movable contact piece in conjunction with the switching operation, so it can be easily applied to both push button type switches and rotary type switches. It can be used as a contact switching mechanism with high.
[0030]
  Further, only one fixed contact piece may be arranged and switched at a position opposed to one end of the movable contact piece tilted in a seesaw shape. The second fixed contact piece may be arranged and switched. In this case, both fixed contact pieces can be dealt with in the same shape, and thus can be shared by the same parts.
[0031]
  Further, when an excessive tilt restricting projection that restricts the excessive tilting of the movable contact piece is provided on the inner wall surface of the housing on the fixed contact piece side, the excessive tilt restricting action of the excessive tilt restricting projection works and the movable tilts in a seesaw shape. Since the contact piece can be restricted from excessive tilting, the contact parts on the unused side are omitted in advance, and even if there is a space in the part, the excessive tilt control protrusion is movable at the position of the space. It is possible to maintain an appropriate tilting state by restricting excessive tilting.
[0032]
  The excessive tilt restricting protrusion is integrally formed on the inner wall surface of the housing on the fixed contact piece side and protrudes toward the movable contact piece side. The protrusion amount is obtained when the contact portion of the movable contact piece is received by the contact portion of the fixed contact piece. If it is configured to project and accept the end of the movable contact piece at a more inclined position than the inclination of the movable contact piece, stable reversal operation is ensured without entering the reversal operation area of the movable contact piece. can do.
[0033]
  For this reason, it is possible to use a common housing that can be shared by all switches of single-pole double-throw type switches and single-pole single-throw type switches having different contact structures. In particular, the excessive tilting of the movable contact piece can be regulated to prevent unstable movement such as displacement of the movable contact piece, so that the balance of the contact structure can be kept normal and stable switching operation can be ensured. . Therefore, in this case, a correction member such as a dummy contact can be omitted, and stable contact performance can be obtained even if the number of parts is reduced, and the cost can be reduced by using the housing in common.
[0034]
  sameSimilarly, the contact switching mechanism is applied to the rotary switch.By doingIt is set and attached in a pressurizing direction so that a switching operation force from the outside is smoothly applied in the direction of the lever rotation direction with respect to the lever rotation direction.
[0035]
  For example, when the door is installed corresponding to the open / close door of a double-opening refrigerator, the operating force accompanying the opening / closing of the door is applied in a direction substantially parallel to the surface of the housing. The lever is subjected to a switching operation so as to be immersed in the housing while rotating at one end about the rotation fulcrum.
[0036]
  Also in this case, the U-shaped movable contact piece is elastically displaced in accordance with the pivoting operation of the lever, and the switching operation is performed so that the contact portions between the movable contact piece and the fixed contact piece are elastically connected and separated. Can be configured.
[0037]
  By the way, about the U-shaped movable contact piece mentioned above, it is preferable to provide the open end part of the other piece side in the dogleg bent part bent inward in the dogleg shape. By providing this square-shaped bent part,Lever pressingHowever, since the apex on the bent portion is always a contact point, a stable contact contact force can be obtained in combination with the elastic action of the U-shaped movable contact piece itself.
[0038]
  Further, for the U-shaped movable contact piece, a sliding contact protrusion protruding in a long and narrow semicircular shape along the longitudinal direction is provided in the center of the outer surface on the other piece side, and along the longitudinal direction of the sliding contact protrusion,leverCorresponds to contact during operation. By providing this sliding contact projection,leverThis means that sliding contact is performed not by surface contact but by point contact during switching operation, so that mutual wear between both members is reduced, life can be extended, and smooth movement can be obtained.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below with reference to the drawings.
  [First Embodiment]
  The drawing shows a push button switch used for a door switch of a refrigerator. In FIGS. 1 and 2, this push button switch 11 includes a housing 12, a cover 13, a push button 14, a return spring 15, and three pieces. The fixed terminals 16 to 18 and the movable piece 19 are integrally assembled.
[0040]
  The housing 12 has a mounting cavity for incorporating the above-described components therein, and this cavity is closed by a cover 13 described later.
[0041]
  FIG. 3 shows a cover 13, which is attached and attached from one side opening 12a (see FIG. 2) of the housing 12. On the inner surface of the cover 13, fixed terminals 16 to 18 described later and movable The partition member 13a ... which partitions and supports the piece 19 separately is provided.
[0042]
  Also, on the upper side of the cover 13, there is provided a shaft support portion 13b that is shared with a rotation switch of different specification type. This one type of cover 13 can also be turned into a push button type switch. It can also be used for lever type switches.
[0043]
  FIG. 4 shows a push button 14. The push button 14 has an upper side elongated in the vertical direction as a pressing surface 14a, and a pair of retaining projections 14b projecting from both sides on the lower side. The push button 14 is inserted into the cylindrical portion 12b of the housing 12 from below and is slidably mounted in the vertical direction with the cylindrical portion 12b as a guide. The push button 14 is pressed by receiving a biasing force of a return spring 15 described later. The lower surface 14a is supported in a pressable state protruding upward. At this time, the retaining protrusion 14 b of the push button 14 is latched by a latching portion (not shown) inside the housing, and the push button 14 is retained by the housing 12.
[0044]
  Further, an inclined protrusion 14c is provided on the lower side of the push button 14, and the inclined protrusion 14c performs a switching operation in contact with a movable piece 19 described later.
[0045]
  The return spring 15 described above is formed of a coil spring, the upper end is inserted into the lower surface recess 14d (see FIG. 7) of the push button 14, and the lower end is elastically pressed against the spring seat 13c formed on the lower surface of the cover 13, so The housing 12 is urged and supported by the housing 12 so that the push button 14 can be pressed. In the figure, 12c is a terminal connection port.
[0046]
  FIG. 5 shows three fixed terminals 16 to 18 and one movable piece 19 as contact components, and each of the fixed terminals 16 to 18 is formed of a conductive metal plate in an elongated flat plate shape independently in three rows. The first fixed terminal 17 is attached to the housing 12 in parallel with the first fixed terminal 17 at the upper position sandwiching the common fixed terminal 16 at the intermediate position, and the second fixed terminal 18 at the lower position. A fixed fulcrum portion 16a protruding in a mountain shape is formed on the flat surface of the tip portion. Further, a small hemispherical first fixed contact portion 17a is provided on the top surface of the first fixed terminal 17 disposed at the upper position, and the distal end portion of the second fixed terminal 18 disposed on the lower side. A small hemispherical second fixed contact portion 18a is provided on the plane. In this case, since the first fixed terminal 17 and the second fixed terminal 18 have the same shape and the same function, they can be shared by the same parts.
[0047]
  Further, the fixed contact portions 17a and 18a of the first fixed terminal 17 and the second fixed terminal 18 are not provided with separate parts, but the tips of the fixed terminals 17 and 18 protrude as protruding contacts to form the same parts. It can also be provided.
[0048]
  The movable piece 19 is formed by bending a conductive spring metal plate into a long U shape. Of the two pieces 19A and 19B having the bent portion as a top, the common fixed terminal 16 is located at an intermediate position on one side 19A. A tilting fulcrum portion 19a corresponding to the concave portion is formed on the fixed fulcrum portion 16a projecting at the tip of the first fulcrum, and a first movable contact portion 19b projecting toward the fixed contact portion side is formed on the upper side of the tilting fulcrum portion 19a, A second movable contact portion 19c protruding toward the fixed terminal side is formed on the lower side of the tilting fulcrum portion 19a. In this case as well, the movable contact portions 19b and 19c are not limited to projecting, and can be formed by attaching separate parts for contacts.
[0049]
  Then, the tilting fulcrum portion 19a of the movable piece 19 and the fixed fulcrum portion 16a of the common fixed terminal 16 opposed to the movable piece 19 are supported in a tiltable manner corresponding to the unevenness. At this time, the other side 19B of the movable piece 19 is pressed against the inclined protrusion 14c of the push button 14 described above and biased toward the one side 19A so as to contact the contact portion with the fixed terminal side. In the switching operation, when the inclined protrusion 14c integrated with the push button 14 moves up and down and exceeds the position of the tilting fulcrum portion 19a, the biasing force applied to the upper side of the movable piece is switched to the biasing force applied to the lower side of the movable piece, Based on this, the movable piece 19 reverses the tilting fulcrum portion 19a to the tilting fulcrum in a seesaw shape, and the contact is switched. For this reason, the movable piece 19 is tilted at the time of the switching operation, and is brought into urging contact with the fixed contact portions 17a and 18a on the fixed terminals 17 and 18 side on which one of the movable contact portions 19b and 19c faces, and is conducted. Further, when the push button 14 is released, the movable piece 19 performs a reverse reversal operation with the tilting fulcrum portion 19a as the tilting fulcrum and the contact is switched to return to the original contact state.
[0050]
  Further, with respect to the U-shaped movable piece 19, a sliding contact projection 19d that protrudes in an elongated semicircular shape along the longitudinal direction is provided at the center of the outer surface of the other piece side 19B, and along the longitudinal direction of the sliding contact projection 19d. The inclined protrusion 14c of the push button 14 corresponds to contact.
[0051]
  At this time, by providing the sliding piece 19d on the movable piece 19, the inclined protrusion 14c of the push button 14 is slidably contacted not by surface contact but by point contact at the time of switching operation, and mutual wear between both members. As a result, the life can be extended and smooth movement can be obtained.
[0052]
  Furthermore, it has a dogleg-shaped bent portion 19e in which the lower end of the other side 19B is bent inwardly in a dogleg shape. By providing this dogleg-shaped bent portion 19e, the apex 19f of the sliding contact projection 19d on the dogleg-shaped bent portion 19e is always a contact point even when the push button 14 is pushed in. A stable contact contact force is obtained in combination with the elastic action of the movable piece itself (see the description of FIGS. 24 to 26 described later).
[0053]
  In the push button switch 11 configured as described above, when the push button 14 is not depressed when the door is opened, the other side 19B of the upper part of the movable piece is urged by the inclined protrusion 14c of the push button, and FIG. As shown in FIG. 8, the tilting fulcrum portion 19a of the movable piece 19 is supported by the fixed fulcrum portion 16a of the common fixed terminal 16 and is always in contact with the first movable contact portion 19b on the upper side of the movable piece. The common fixed terminal 16 and the first fixed terminal 17 are in a conductive state via the movable piece 19 in correspondence with the first fixed contact portion 17 a of the first fixed terminal 17.
[0054]
  Next, as shown in FIG. 9, when the push button 14 is pushed down, the push button 14 moves downward straight against the urging force of the return spring 15, and the upper part of the push button 14 is in the housing 12. Is pushed into.
[0055]
  At this time, the inclined protrusion 14c of the push button 14 advances while sliding along the other side 19B of the movable piece 19 having a spring property, and passes through the position of the tilting fulcrum 19a of the movable piece 19 as shown in FIGS. As described above, the movable piece 19 is inverted into a seesaw shape based on the elasticity possessing characteristic of the U shape itself with the tilting fulcrum 19a as a fulcrum, and the first movable contact 19b that has been conducted until now is the first fixed contact The second movable contact portion 19c comes into contact with the second fixed contact portion 18a instead of being away from 17a, and the common fixed terminal 16 and the second fixed terminal 18 become conductive.
[0056]
  When the movable piece 19 is reversed, the movable piece itself is momentarily reversed by the snap action by the reaction force of the U-shaped leaf spring material, so that the generation of arc is eliminated and the generation of an oxide film is prevented and reliability is improved. High and stable contact performance can be obtained.
[0057]
  Further, the push button 14 is pushed in, and the lower end of the push button 14 comes into contact with the bottom surface of the cover 13 and stops. When the external force of the push button 14 is removed from this pressed state, the push button 14 receives the return force of the return spring 15 and retreats back to the original pressing standby position, and the movable piece 19 is similarly reversed to return to the original position. , The contact portion performs the reverse operation opposite to the above-described movement to return to the initial state, and the contact is switched.
[0058]
  Further, if the inclined length 14g (see FIG. 12) of the inclined protrusion 14c of the push button 14 corresponding to the sliding contact protrusion 19d of the movable piece 19 is increased, a long pressing stroke with respect to the movable piece 19 is obtained, and the movable piece 19 is obtained. The contact stability with is improved.
[0059]
  By the way, the support structure for allowing the above-described movable piece 19 to be reversed in a seesaw shape is such that one of the tilting fulcrum portion 19a on the movable piece 19 side and the fixed fulcrum portion 16a on the common fixed terminal 16 side that receives this is a recess. Providing the other on the convex portion is suitable because a stable tilting operation can be obtained with a simple configuration. In the above example, the common fixed terminal 16 side is formed as a convex portion and the movable piece 19 side is formed as a concave portion. However, the present invention is not limited to this.
[0060]
  Also, in the convex shape of the fixed fulcrum portion 16a, a part of the metal flat plate of the common fixed terminal 16 is partially formed as a convex portion. Similarly, as shown in FIG. The fixed fulcrum portion 132 may be provided by protruding the entire upper end of the flat plate tip of the terminal 131, and as shown in FIG. 13B, a part of the flat plate tip of the common fixed terminal 133 partially protrudes. A fixed fulcrum part 134 may be provided.
[0061]
  Thus, since the push button switch 11 has a seesaw-type contact switching mechanism that reverses the movable piece 19 in accordance with the switching operation, the movable piece itself has a contact function and a return spring function. In addition, the number of parts and the number of assembly steps can be reduced, and the simplification of the internal structure can reduce the cost and the space saving.
[0062]
  In particular, when the housing 12 is assembled, the plurality of fixed terminals 16 to 18 are arranged in parallel in the housing. Therefore, the housing 12 can be assembled in a compact manner by efficiently aligning the interior space of the housing without requiring a wasteful arrangement space. it can.
[0063]
  The movable piece 19 is also suitable for miniaturization because it is small as if it was provided in a U-shape and folded, and both the pieces having the U-shaped bend at the apex are elastically displaced in the opposite direction. Since sufficient elasticity can be obtained, an accurate spring function can be obtained while being small. Further, since the movable piece 19 is orthogonal to the parallel direction of the fixed terminals 16 to 18 so as to be able to contact each fixed terminal, it is suitable for an intensive contact portion arrangement structure and an efficient arrangement configuration. Can be planned.
[0064]
  In addition, since the inclined protrusion 14c of the push button 14 contacts along the outer surface longitudinal direction of the U-shaped other side 19B of the movable piece 19, the push button 14 comes into contact with the longer side of the other side 19B, The operation stroke of the push button can be taken long enough. Since the operation stroke can be made longer during the switching operation in this way, if the contact switching region is set within the range of the operation stroke, there is no adverse effect due to variations in switch mounting accuracy. For this reason, the shortage of strokes can be resolved and turned on and off reliably, and excessive strokes are allowed and there is no risk of breakage of the switch parts.
[0065]
  [Second Embodiment]
  Next, instead of the push button switch 11, a case where a rotation switch is similarly used as a door switch of the refrigerator will be described.
[0066]
  14 and 15, the rotation switch 141 includes a housing 142, a cover 143, a rotation lever 144, a return spring 145, three fixed terminals 146 to 148, and a movable piece 149. Composed.
[0067]
  The housing 142 has a mounting cavity for incorporating the above-described components therein, and this cavity is closed by a cover 143 to be described later.
[0068]
  The above-described cover 143 is the same as the cover 13 shown in FIG. 3, and is attached and integrated from one side opening 142 a of the housing 142, similarly to the push button switch 11.
[0069]
  FIG. 16 shows a rotating lever 144. The rotating lever 144 has a fan shape, and a lever pressing piece 144a extends obliquely upward along the inclined upper surface thereof, and is formed on both side surfaces of the lower fan-shaped central corner. A support shaft 144b is provided so that one support shaft 144b is supported by a shaft support portion 13b (see FIG. 3) formed on the inner surface of the cover 143, and the other support shaft 144b opens on the inner surface of the housing 142. The pivot lever 144 is pivotally supported by a pivot support hole 142c provided to be freely pivoted to the housing 142 with these pivot support portions as pivot base points.
[0070]
  The rotating lever 144 is inserted into the lever mounting opening 142b of the housing 142 from above, and a lever pressing piece 144a as a pressing corresponding surface of the rotating lever 144 protrudes upward by receiving a biasing force of a return spring 145 described later. When the lever pressing piece 144a that extends obliquely upward receives an external force from the horizontal direction, the lever pressing piece 144b on both sides rotates about the fulcrum.
[0071]
  Further, a semicircular slidable contact projection 144c is provided on one side surface of the lower portion of the rotating lever 144, and the semicircular slidable contact projection 144c is movable having the same configuration as the movable piece 19 described above with reference to FIG. The switching operation is performed corresponding to the contact with the piece 147.
[0072]
  At this time, the semicircular sliding contact projection 144c is formed in a semicircular shape extending in a semicircular shape along the rotation direction with the support shaft 144b of the lever 144 as a rotation base point, and the contact portion protrudes in a semicircular shape in cross section. The contact surfaces are provided so as to come into sliding contact with each other. For this reason, wear between mutual contact members is reduced, and a smooth movement is obtained.
[0073]
  Further, on the lower surface of the lever 144, there are formed split grooves 144d and 144e that are capable of expanding and contracting in the thickness direction and improving the attachment of the support shaft 144b.
[0074]
  The return spring 145 described above is formed of a coil spring, and this return spring 145 is inserted and supported by a spring support shaft 142d that protrudes horizontally inside the housing 142, and one end of the return spring 145 is fixed to the housing 142. The other end is engaged and fixed to the fan-shaped lower surface of the rotating lever 144, and the lever pressing piece 144 a protrudes from the upper surface of the housing 142 by the biasing force of the spring 145 so that the rotating lever 144 Is pushed upward from the upper surface of the housing 142 so as to be pressed.
[0075]
  When an external force is applied to the upper lever pressing piece 144a and a switching operation is performed, the rotating lever 144 starts to rotate downward, and the inner contact portion is switched.
[0076]
  The three fixed terminals 146 to 148 and one movable piece 149 as the contact components described above have the same structure as the fixed terminals 16 to 18 and the movable piece 19 described above with reference to FIG. Has a fixed fulcrum part 146a, the first fixed terminal 147 has a first fixed contact part 147a, and the second fixed terminal 148 has a second fixed contact part 148a. The movable piece 149 has a tilting fulcrum part 149a, a first movable contact part 149b, and a second movable contact part 149c on one side 149A of the U shape.
[0077]
  Therefore, since the same contact configuration as that of the push button switch 11 described above, the same switching operation is performed by switching the contact, and since it is the same part, it can be used as a common part. Further, the present invention can be similarly applied even if the fixed terminal shown in FIG. 13 having the same contact switching structure and partially improved is used. As described above, the contact switching structure and the function and effect thereof are the same as those of the above-described embodiment, and thus the same description is omitted.
[0078]
  In the rotation switch 141 configured as described above, when the rotation lever 144 is not pressed, the other side 149B of the upper part of the movable piece is urged by the semicircular sliding contact projection 144c of the rotation lever, and FIG. As shown in FIG. 19, the tilting fulcrum portion 149a of the movable piece 149 is supported by the fixed fulcrum portion 146a of the common fixed terminal 146 and is always in contact with the first movable contact portion 149b on the upper side of the movable piece. Corresponds to the first fixed contact portion 147a of the first fixed terminal 147, and the common fixed terminal 146 and the first fixed terminal 147 are in a conductive state via the movable piece 149.
[0079]
  Next, as shown in FIG. 20, when the rotating lever 144 is pressed by receiving an external force from the horizontal direction, the rotating lever 144 rotates downward against the urging force of the return spring 145. The entire rotation lever 144 is pushed into the housing 142.
[0080]
  At this time, the semicircular sliding contact projection 144c of the rotating lever 144 advances while sliding along the other side 149B of the movable piece 149 having a spring property, and passes through the position of the tilting fulcrum portion 149a of the movable piece 149. As shown in FIG. 23, the movable piece 149 is inverted into a seesaw shape based on the elasticity possessing property of the U-shape itself with the tilting fulcrum portion 149a as a fulcrum, and the first movable contact portion 149b that has been conducted so far is the first one. The second movable contact portion 149c comes into contact with the second fixed contact portion 148a instead of being separated from the first fixed contact portion 147a, and the common fixed terminal 146 and the second fixed terminal 148 are in a conductive state.
[0081]
  When the movable piece 149 is reversed, the movable piece itself is momentarily reversed by the snap action by the reaction force of the U-shaped leaf spring material, so that the generation of an arc is efficiently eliminated and the generation of an oxide film on the contact surface And reliable contact performance can be obtained.
[0082]
  Further, when the turning lever 144 is pushed in and the lever pressing piece 144a of the turning lever 144 is flush with the upper surface of the housing, the turning is stopped. When the external force of the rotating lever 144 is removed from this pressed state, the rotating lever 144 receives the return force of the return spring 145 and retreats back to the original pressing standby position, and the movable piece 149 is similarly reversed to return to the original position. The position is returned to the position, and the reversing operation reverse to the above-described movement is performed between the contact portions to return to the initial state, and the contacts are switched.
[0083]
  By the way, the contact principle and the contact action when the movable piece 19 of the push button switch 11 described above is displaced will be described with reference to the operation explanatory diagrams of FIGS.
[0084]
  FIG. 24 shows the initial position where the movable piece 19 is waiting to be pressed. The contact force between the movable contact portions 19b and 19c and the fixed contact portions 17a and 18a and the contact force corresponding to the contact between the movable contact portions 19b and 19c and the common fixed terminal 16 The contact force of the portion corresponding to the contact between the two changes on the other side of the movable piece 19 in contact with the inclined protrusion 14c. 19B elastically displaces and deforms in the compression direction (inward), and the magnitude of the force generated (analyzing the force is calculated as follows: a substantially horizontal force W0, an upper force μN, a lower force F0, a reaction force N is generated) from the position where the horizontal force acts on the upper and lower movable contact portions 19b and 19c, the upper and lower fixed contact portions 17a and 18a, and the contact corresponding portion between the movable piece 19 and the common fixed terminal 16. Determined by distance.
[0085]
  In this case, when the inclined protrusion 14c where the push button is not pressed is in the pressing standby initial position, the position where the substantially horizontal force W0 acts is between the normally closed contact portions 17a, 19b and the tilting fulcrum portion 19a. However, it is set at a position where an even contact force suitable for contact between the contact portions can be obtained. Each contact force R1, R2 at this time is
  R1: Contact force between the contact points of the tilting fulcrum portion 19a and the fixed fulcrum portion 16a
  R2: Contact force between the contact portions of the first movable contact portion 19b and the first fixed contact portion 17a
  W0: Force applied in a substantially horizontal direction
  L1: Distance from the tilting fulcrum 19a to the position where the horizontal force W0 acts
  L2: Distance from the first movable contact portion 19b to the position where the horizontal force W0 acts
  Then,
            R1 = W0 · (L2 / L1 + L2)
            R2 = W0 · (L1 / L1 + L2)
  It is obtained by
[0086]
  FIG. 25 shows a state in which the inclined protrusion 14c moves downward as the push button is pressed, and the movable piece 19 is in the middle of its lowering, just before reversal. The inclined protrusion 14c gradually presses and fixes the other side 19B of the movable piece 19. The contact force between the contact portions 17a, 18a side and the movable piece 19 side is increased. At this time, it represents the corresponding position immediately before the reversal of the movable piece 19 when the force W1 applied to the other piece side 19B of the movable piece 19 reaches the tilting fulcrum 19a.
[0087]
  FIG. 26 shows the operation limit position where the inclined protrusion 14c corresponding to the completion of pressing the push button has moved to the lowest position, and the force W2 acting on the movable piece 19 at this operation limit position also forms a dogleg-shaped bent portion 19e. Therefore, the position where the force W2 acts acts between the normally closed contact portions 18a and 19c and the tilting fulcrum portion 19a so that an even contact force suitable for contact between the contact portions can be obtained. . Each contact force R3, R4 at this time is
  R3: Contact force between the contact points of the tilting fulcrum portion 19a and the fixed fulcrum portion 16a
  R4: Contact force between the contact portions of the second movable contact portion 19c and the second fixed contact portion 18a
  W2: Force applied in a substantially horizontal direction
  L3: Distance from the tilting fulcrum 19a to the position where the horizontal force W2 acts
  L4: Distance from the second movable contact portion 19c to the position where the horizontal force W2 acts
  Then,
            R3 = W2 ・ (L4 / L3 + L4)
            R4 = W2 ・ (L3 / L3 + L4)
  It is obtained by
[0088]
  Furthermore, the lower end portion of the other side 19B of the movable piece 19 is bent inward so that a contact area between the inclined projection 14c and the movable piece 19 is defined and an equal contact force suitable for contact between the contact portions can be secured. Further, the contact region length is limited by having a dogleg-shaped bent portion 19e. For this reason, even if a switching operation is performed in which the movable piece 19 is repeatedly reversed in a seesaw shape, a uniform and stable contact force acts on the movable piece 19 from beginning to end.
[0089]
  [Third embodiment]
  27 and 28 show another example of a push button switch 271 used for a door switch of a refrigerator, and this push button switch 271 is provided with a housing 272 that can be commonly used for several types of push button switches. The housing 272, the cover 273, the push button 274, the return spring 275, the three fixed terminals 276 to 278, and the movable piece 279 are integrally assembled.
[0090]
  FIG. 29 shows a housing 272. The housing 272 has a mounting cavity into which the above-described components are incorporated. A push button 274, a return spring 275, and three of the cavity 272 are opened from one side opening 272a. The fixed terminals 276 to 278 and the movable piece 279 are assembled, and the one side opening 272a is closed by a cover 273 described later.
[0091]
  Further, the upper surface of the housing 272 has a cylindrical portion 272b penetrating in the vertical direction, and a push button 274 is slidably mounted in the vertical direction and is attached to a space portion in the cylinder of the push button 274. A return spring 275 is housed and attached in a compressed state. Further, a position adjacent to the inner side of the push button 274 has a movable piece mounting portion 272c that holds the movable piece 279, and further, a position adjacent to the movable piece 279 is arranged in parallel in three rows divided in the vertical direction. It has a fixed terminal mounting portion 272d and its terminal connection port 272e.
[0092]
  FIG. 30 shows a cover 273. The cover 273 is attached and attached from one side opening 272a of the housing 272, and fixed terminals 276 to 278 and movable pieces 279 described later are individually attached to the inner surface of the cover 273. The partition member 273a ... which partitions and supports is provided.
[0093]
  Also, on the upper side of the cover 273, there is provided a shaft support portion 273b that is used in common with a rotation switch of different specification type, and this one type of cover 273 can also be turned into a push button type switch. It can also be used for lever type switches.
[0094]
  FIG. 31 shows a push button 274. The push button 274 has a top portion of a cylindrical body elongated in the vertical direction as a pressing surface 274a, and has a retaining block portion 274b on the lower side. The push button 274 is inserted into the cylindrical portion 272b of the housing 272 from below, and is slidably mounted in the vertical direction with the cylindrical portion 272b as a guide. The push button 274 receives the urging force of a return spring 275, which will be described later. The lower surface 274a is supported in a pressable state protruding upward. At this time, as shown in FIGS. 32 and 33, the retaining block portion 274b of the push button 274 is engaged with the retaining engagement surface 272f inside the housing 272, and the push button 274 is removed from the housing 272 integrally. Stopped and supported.
[0095]
  In this case, as shown in FIG. 31, a tapered surface 274f is formed on the outer peripheral surface of the bottom of the cylindrical body of the push button 274 in order to improve the water tightness between the sliding surfaces of the push button 274 and the housing 272. Thereby, in the pressing standby state incorporated in the housing 272, the taper surface 274f is pressed against the opening peripheral edge portion 272g of the housing cylindrical portion 272b by the urging force of the return spring 275 to have a simple watertight structure.
[0096]
  Thus, a simple watertight structure can be provided only by providing the tapered surface 274f, and water can be prevented from entering the housing from the push button portion. For this reason, a watertight structure can be obtained without the need for a sealing member such as rubber, and since there is no water intrusion into the housing, the mounting direction as a door switch can be arbitrarily selected.
[0097]
  An annular protrusion (not shown) is formed on the surface of the retaining block portion 274b of the push button 274, and this projecting portion is brought into contact with the retaining locking surface 272f inside the housing 272, thereby simplifying watertightness. A structure may be formed.
[0098]
  Further, an inclined protrusion 274c is provided on the lower side of the push button 274, and the inclined protrusion 274c is switched in contact with a movable piece 279 described later.
[0099]
  The above-described return spring 275 is formed of a coil spring, the upper end is inserted into the lower surface recess 274d (see FIG. 35) of the push button 274, and the lower end is elastically pressed against the spring seat 273c formed on the lower surface of the cover 273. The housing 272 is urged and supported so that the push button 274 can be pressed.
[0100]
  FIG. 34 shows three fixed terminals 276 to 278 and one movable piece 279 as contact components, and each fixed terminal 276 to 278 is arranged in parallel in three rows in an elongated flat plate shape with a conductive metal plate. The first fixed terminal 277 is mounted on the housing 272 in parallel with the first fixed terminal 277 at the upper position sandwiching the common fixed terminal 276 at the intermediate position, and the second fixed terminal 278 is mounted at the lower position. A fixed fulcrum portion 276a that protrudes in a mountain shape is formed on the portion.
  In addition, a first fixed contact portion 277a having a small rectangular parallelepiped shape is attached to the top surface of the first fixed terminal 277 disposed at the upper position by caulking, and is also disposed on the lower side. A second fixed contact portion 278a having a small rectangular parallelepiped shape is attached on the front end portion plane of the fixed terminal 278 by caulking. In this case, since the first fixed terminal 277 and the second fixed terminal 278 have the same shape and the same function, they can be shared by the same component.
[0101]
  Further, when mounting, the positioning holes 276b to 278b opened in the central portions of the fixed terminals 276 to 278 are inserted into the positioning pins 272h.
[0102]
  The movable piece 279 is formed by bending a conductive spring-like metal plate into a long U shape. Of the two pieces 279A and 279B having the bent portion at the top, the common fixed terminal is located at the middle position in the longitudinal direction of the one side 279A. The tilting fulcrum part 279a corresponding to the recess is formed in the fixed fulcrum part 276a projecting at the tip of the 276, and the first movable contact part 279b projecting toward the fixed contact part side is caulked on the upper side of the tilting fulcrum part 279a. The second movable contact portion 279c protruding toward the fixed contact portion side is caulked and attached to the lower side of the tilting fulcrum portion 279a.
[0103]
  The tilting fulcrum part 279a of the movable piece 279 described above and the fixed fulcrum part 276a of the common fixed terminal 276 opposite to the tilting fulcrum part 276a correspond to the projections and depressions so that the movable piece 279 can be tilted. At this time, the other side 279B of the movable piece 279 is pressed against the inclined protrusion 274c of the push button 274 described above to urge the one side 279A, and the contact portion with the fixed terminal side is in contact. In the switching operation, it moves up and down in conjunction with the movement of the inclined protrusion 274c protruding below the push button 274, and when the inclined protrusion 274c exceeds the position of the tilting fulcrum 279a during the downward movement, it is applied to the upper side of the movable piece. The urging force is switched to the urging force applied to the lower side of the movable piece, and based on this, the movable piece 279 is reversed in a seesaw shape with the tilting fulcrum portion 279a as a fulcrum, and the contact is switched.
[0104]
  For this reason, the movable piece 279 is tilted at the time of the switching operation, and the upper and lower movable contact portions 279b and 279c are brought into energized contact with the fixed contact portions 277a and 278a on the fixed terminals 277 and 278 facing each other. Further, when the push button 274 is released, the movable piece 279 reverses in a reverse direction like a seesaw with the tilting fulcrum 279a as a fulcrum, and the contact is switched to return to the original contact state.
[0105]
  Further, with respect to the U-shaped movable piece 279, a sliding contact projection 279d projecting in an elongated semicircular shape along the longitudinal direction is provided in the center of the outer surface of the other piece side 279B, and along the longitudinal direction of the sliding contact projection 279d. The inclined protrusion 274c of the push button corresponds to contact from end to end.
[0106]
  At this time, by providing the sliding contact projection 279d on the movable piece 279, the inclined projection 274c of the push button is slidably contacted not only by surface contact but by point contact at the time of switching operation. Mutual wear due to operation is reduced, life can be extended and smooth movement can be obtained.
[0107]
  Furthermore, the lower end of the other side 279B has a dogleg-shaped bent portion 279e bent inwardly in a dogleg shape. By providing the dogleg-shaped bent portion 279e, the apex 279f of the sliding contact projection 279d on the dogleg-shaped bent portion 279e is always a contact point even when the push button 274 is pushed in. A stable contact force can be obtained in combination with the elastic action of the movable piece itself.
[0108]
  In the push button switch 271 configured as described above, when the door is opened and the push button 274 is not depressed, the other side 279B of the upper part of the movable piece is biased by the inclined protrusion 274c of the push button. 35 to 36, the tilting fulcrum portion 279a of the movable piece 279 is supported by the fixed fulcrum portion 276a of the common fixed terminal 276 and is always in contact with the first piece on the upper side of the movable piece. The common fixed terminal 276 and the first fixed terminal 277 are in a conductive state via the movable piece 279 so that the movable contact portion 279 b comes into contact with the first fixed contact portion 277 a of the first fixed terminal 277.
[0109]
  When the push button 274 is pressed, the push button 274 moves straight downward against the urging force of the return spring 275 and the upper part of the push button 274 is pushed into the housing 272.
[0110]
  At this time, the inclined protrusion 274c of the push button 274 and the movable piece 279 move in the same manner as the movement described in FIGS.
[0111]
  The inclined protrusion 274c that moves downward when pushed down advances while sliding along the other side 279B of the movable piece 279 having a spring property. At the fulcrum, the first movable contact portion 279b that has been turned on so far is separated from the first fixed contact portion 277a and turned off based on the elasticity possessing characteristics of the U-shape. The second movable contact portion 279c comes into contact with the second fixed contact portion 278a, and the common fixed terminal 276 and the second fixed terminal 278 become conductive.
[0112]
  When the movable piece 279 is reversed, the movable piece itself is momentarily reversed by the snap action caused by the reaction force of the U-shaped leaf spring material, so that the generation of arc is eliminated and the generation of oxide film is prevented. High and stable contact performance can be obtained.
[0113]
  Further, when the push button 274 is pushed in and the lower end of the push button 274 comes into contact with the bottom surface of the cover 273, the push button 274 stops. When the external force of the push button 274 is removed from this pushed state, the push button 274 returns to the return spring 275. In response to the force, it returns to the original pressing standby position, the movable piece 279 similarly reverses and returns to the original position, and the reverse operation reverse to the above movement is performed between the contact portions to return to the initial state. Switching takes place.
[0114]
  Further, if the inclined length 274g (see FIG. 36) of the inclined protrusion 274c of the push button 274 corresponding to the sliding contact protrusion 279d of the movable piece 279 is increased, a long pressing stroke with respect to the movable piece 279 is obtained, and the movable piece 279 is obtained. The contact stability with is improved.
[0115]
  By the way, the support structure for allowing the above-described movable piece 279 to be reversed in a seesaw shape is such that one of the tilting fulcrum part 279a on the movable piece 279 side and the fixed fulcrum part 276a on the common fixed terminal 276 side that receives this is formed into a recess. Providing the other on the convex portion is suitable because a stable tilting operation can be obtained with a simple configuration.
[0116]
  Further, excessive tilt restriction protrusions 272i (see FIG. 33) for restricting the movable piece 279 from tilting excessively are provided on the inner wall surface of the housing facing the upper and lower fixed contact portions 277a and 278a.
[0117]
  The excessive tilt restricting protrusion 272i is formed by removing the upper first movable contact portion 279b and the first fixed contact portion 277a, or the lower second movable contact portion 279c and the second fixed contact portion 278a, so as to provide a single pole single throw. In the case of a switch having a type of contact configuration, contact parts on the nonuse side are omitted in advance, so that even if there is a space in that portion, the excessive tilt restricting protrusion 272i is movable at the position of the space 279. It is formed so as to maintain an appropriate tilting state by restricting excessive tilting.
[0118]
  For this reason, when the excessive tilt restricting protrusion 272i is provided, the excessive tilt restricting action of the protrusion 272i acts to restrict the excessive tilting of the movable piece 279 tilted like a seesaw. For this reason, a common housing 272 that can be shared by two types of single pole single throw type switches and single pole double throw type switches having different contact structures can be used.
[0119]
  For example, as shown in FIG. 37, in the case of a single-pole single-throw type push button switch 271A in which the housing 272 is applied to a normally closed contact configuration, the first movable contact portion 279b and the first fixed contact provided on the upper side. The second movable contact portion and the second fixed contact portion on the lower side are manufactured in advance in the manufacturing stage, and can be configured with only necessary components.
[0120]
  When the push button 274 of the push button switch 271A is not depressed, as shown in FIG. 37A, a normally closed contact in which the first movable contact portion 279b and the first fixed contact portion 277a are always in contact with each other. Is in a state.
[0121]
  When the push button 274 is pressed from this normally closed contact state, as shown in FIG. 37 (B), the movable piece 279 is pushed by the inclined protrusion 274c of the push button and inverted in a seesaw shape, and the upper side normally closed Is switched from closed to open.
[0122]
  At this time, the excessive tilting of the lower part of the movable piece 279 at the position of the space space S corresponding to the removed contact portion is restricted by tilting so that the movable piece 279 is received by the excessive tilt restricting protrusion 272i. The position can be restricted to the tilt angle.
[0123]
  As a result, it is possible to prevent excessive movement of the movable piece 279 and prevent unstable movement such as displacement of the movable piece 279, so that a stable switching operation can be ensured while keeping the balance of the contact structure normal. .
[0124]
  FIG. 38 shows a case of a single-pole single-throw type push button switch 271B in which the housing 272 is applied to a normally open contact configuration. In this case, a second movable contact portion 279c and a second fixed contact portion 278a provided on the lower side are shown. The first movable contact portion and the first fixed contact portion on the upper side are manufactured in advance in the manufacturing stage, and can be configured with only necessary components.
[0125]
  In the pressing standby state in which the push button 274 of the push button switch 271B is not pressed, the lower second movable contact portion 279c and the second fixed contact portion 278a are always opened as shown in FIG. It is in a normally open contact state.
[0126]
  At this time, the upper portion of the movable piece 279 is restricted from tilting so as to be received by the excessive tilt restricting protrusion 272i from being excessively tilted at the position of the space S corresponding to the removed contact portion. For this reason, the position of the movable piece 279 can be restricted to an appropriate tilt angle.
[0127]
  When the push button 274 is pressed from this normally open contact state, as shown in FIG. 38 (B), the movable piece 279 is pushed by the inclined protrusion 274c of the push button and inverted in a seesaw shape, and the lower contact portion The interval is switched from open to closed.
[0128]
  FIG. 39 shows a case of a single-pole double-throw type push button switch 271 in which the housing 272 is applied to a normally closed / normally open contact configuration as shown in FIG. 36. In this case, the push button 274 is not depressed. In the pressing standby state, as shown in FIG. 39 (A), the first movable contact portion 279b and the first fixed contact portion 277a are in a normally closed contact state in which they always correspond to each other. For example, when the upper side becomes a closed contact in conjunction with the opening of the door of the refrigerator, the interior illumination lamp is turned on in response to the upper side closing signal, and simultaneously the output of the cooling motor is stopped.
[0129]
  When the push button 274 is pressed from this normally closed contact state, as shown in FIG. 39B, the movable piece 279 is pushed by the inclined protrusion 274c of the push button and inverted in a seesaw shape, and the upper contact portion The interval is switched from closed to open. Simultaneously with this switching, the second movable contact portion 279c and the second fixed contact portion 278a on the lower side are switched from open to closed in correspondence with each other.
[0130]
  Along with the closing signal on the lower side, for example, a cooling motor of a refrigerator is activated, and the lamp for interior lighting is turned off. At this time, since the contact portions exist in the upper and lower portions, there is no space space that causes excessive tilting in the contact portions.
[0131]
  FIG. 40 is composed of a movable piece 279 of a single-pole single-throw type push button switch 271A applied to the normally closed contact configuration shown in FIG. 37, a first fixed terminal 277, and a common fixed terminal 276. Can do. In this case, the second movable contact portion can be omitted on the movable piece 279 side, and the second fixed terminal itself can be reduced on the fixed terminal side.
[0132]
  FIG. 41 is composed of a movable piece 279 of a single-pole single-throw type push button switch 271B applied to the normally open contact configuration shown in FIG. 38, a common fixed terminal 276, and a second fixed terminal 278. Can do. In this case, the first movable contact portion can be omitted on the movable piece 279 side, and the first fixed terminal itself can be reduced on the fixed terminal side.
[0133]
  [Fourth embodiment]
  FIG. 42 shows a housing 421 provided in a rotation switch used for a door switch of a refrigerator, which is different from the rotation switch of the second embodiment described above because only the housing 421 is different and the other structure is the same. Only the point will be described.
[0134]
  The housing 421 is configured to include excess tilt restriction protrusions 421i at the upper and lower contact corresponding positions. When such an excessive tilt restriction protrusion 421i is provided, the excessive tilting of the movable piece is restricted. As in the third embodiment, the present invention can be applied to different types of switches having a plurality of types of contact configurations.
[0135]
  As described above, since it is provided in the contact switching mechanism of the seesaw structure that reverses the movable piece in accordance with the switching operation, the movable piece itself becomes a shared part having both the contact function and the return spring function, and the number of parts is reduced. Cost reduction associated with reduction of assembly man-hours and downsizing associated with space saving of the internal space can be achieved. Also, when switching the contact, the movable piece itself is formed of a U-shaped leaf spring material, and the U-shaped leaf spring material is snapped in a seesaw-like manner so that the contact point can be switched quickly. It becomes possible, and the generation of arc between the contact points can be prevented.
[0136]
  Further, when the excessive tilt restricting protrusion is provided on the housing, an unstable movement such as a displacement of the movable piece can be prevented, so that a stable switching operation can be secured while maintaining an appropriate posture.
[0137]
    In correspondence between the configuration of the present invention and the configuration of the above-described embodiment,
  The common fixed contact piece of the present invention corresponds to the fixed terminals 16 and 146 of the embodiment,
  Similarly,
  The first fixed contact piece corresponds to the first fixed terminals 17, 147, 277,
  The second fixed contact piece corresponds to the second fixed terminals 18, 148, 278,
  The movable contact pieces correspond to the movable pieces 19, 149, 279.,
  The arc-shaped protrusion corresponds to the semicircular sliding contact protrusion 144c,
  The present invention can be applied based on the technical idea shown in the claims, and is not limited to the configuration of the above-described embodiment.
【The invention's effect】
  According to the present invention, by providing a seesaw-like contact switching mechanism, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced due to simplification of the internal structure. In addition, since the contact is quickly switched by inverting it vigorously, it is possible to prevent arcing between the contact portions and to obtain good contact performance.
[0138]
  In addition, if the housing is provided with excessive tilt restriction projections, the movement of the movable piece can be stabilized even if the number of parts is reduced, and contact performance with high contact reliability can be obtained. It is possible to reduce the manufacturing cost of various switches through common use.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a push button switch.
FIG. 2 is a developed perspective view of a push button switch.
FIG. 3 is an enlarged perspective view showing a cover of a push button switch.
FIG. 4 is an enlarged perspective view showing a push button.
FIG. 5 is an external perspective view showing a movable piece and a fixed terminal of a push button switch.
FIG. 6 is a cutaway perspective view of a main part showing a push standby state of a push button switch.
FIG. 7 is a longitudinal side view showing a push button switch standby state.
FIG. 8 is a longitudinal front view showing a push standby state of a push button switch.
FIG. 9 is a cutaway perspective view of a main part showing a state in the middle of pressing a push button switch.
FIG. 10 is a cutaway perspective view of a main part showing a pressed state of a push button switch.
FIG. 11 is a longitudinal side view showing a pressed state of a push button switch.
FIG. 12 is a longitudinal front view showing a push button switch in a depressed state.
FIG. 13 is an enlarged perspective view showing a common fixed terminal according to another embodiment.
FIG. 14 is an external perspective view of a rotation switch.
FIG. 15 is an exploded perspective view of a rotation switch.
FIG. 16 is an enlarged perspective view showing a rotating lever.
FIG. 17 is a cutaway perspective view of a main part showing a standby state for pressing a rotary switch.
FIG. 18 is a vertical cross-sectional side view showing a waiting state for pressing a rotation switch.
FIG. 19 is a longitudinal front view showing a waiting state for pressing a rotation switch.
FIG. 20 is a fragmentary perspective view showing a state in the middle of depressing the rotation switch.
FIG. 21 is a fragmentary perspective view showing the main switch in a depressed state.
FIG. 22 is a longitudinal sectional side view showing a state where the rotation switch is pressed.
FIG. 23 is a longitudinal front view showing a state where the rotation switch is pressed.
FIG. 24 is an operation explanatory view showing an initial position of the movable piece.
FIG. 25 is an operation explanatory view showing a position immediately before the reversal of the movable piece.
FIG. 26 is an operation explanatory view showing a displacement state after the movable piece is reversed.
FIG. 27 is an external perspective view of another push button switch.
FIG. 28 is a developed perspective view of another push button switch.
FIG. 29 is a perspective view showing a housing of another push button switch.
FIG. 30 is an enlarged perspective view showing a cover of another push button switch.
FIG. 31 is an enlarged perspective view showing another push button.
FIG. 32 is a fragmentary perspective view showing the seal structure of another push button switch.
FIG. 33 is a perspective view of another housing as viewed obliquely from below.
FIG. 34 is an external perspective view showing a movable piece and a fixed terminal of another push button switch.
FIG. 35 is a longitudinal side view showing a standby state for pressing another push button switch.
FIG. 36 is a longitudinal front view showing a standby state for pressing another push button switch.
FIG. 37 is a longitudinal front view showing a switching operation state of a normally closed contact configuration.
FIG. 38 is a longitudinal front view showing a switching operation state of a normally open contact configuration.
FIG. 39 is a longitudinal front view showing a switching operation state of a normally closed / normally open contact configuration.
FIG. 40 is an external perspective view showing a movable piece and a fixed terminal used in a normally closed contact configuration.
FIG. 41 is an external perspective view showing a movable piece and a fixed terminal used in a normally open contact configuration.
FIG. 42 is an external perspective view showing a housing used for another rotation switch.
[Explanation of symbols]
  11, 271, 271A, 271B ... push button switches
  14,274 ... push buttons
  14c, 274c ... inclined projection
  16-18, 146-148, 276-278 ... fixed terminal
  16a, 146a, 276a ... fixed fulcrum
  19, 149, 279 ... movable piece
  19a, 149a, 279a ... tilting fulcrum
  19e, 279e ... V-shaped bent part
  19d, 279d ... sliding contact protrusion
  141 ... Rotation switch
  144 ... Rotating lever
  144c: Semicircular sliding contact protrusion
  272i, 421i ... excess tilt regulating protrusion

Claims (6)

A concave housing opened on one side and a cover for closing the opening surface are provided, and a conductive fixed contact piece and a movable contact piece are provided in the housing so as to be held and operated by the housing. A rotary switch that performs a switching operation by bringing a contact portion between the contact portions into contact with each other by applying a pressing force of a lever to the movable contact piece to displace the movable contact piece.
The housing is provided with a common fixed contact piece and a fixed contact piece different from the common fixed contact piece arranged in parallel,
A conductive leaf spring material is bent at a tilting fulcrum portion that is arranged perpendicular to the parallel arrangement direction of the fixed contact pieces and is urged against the common fixed contact piece side and supported to freely tilt in the orthogonal direction. A movable contact piece having a U-shaped one-sided intermediate position and having a contact portion formed at the longitudinal end of the one-piece side with the tilting fulcrum in the movable displacement direction of the one-piece side as a base point;
With the tilting fulcrum portion of the movable contact piece always in contact with the common fixed contact piece, the movable contact piece can be separated from the contact portion of the fixed contact piece and the movable contact piece facing each other. A contact switching mechanism for switching the movable contact piece in a seesaw-like manner based on the pressing force of the lever in contact with the outer surface longitudinal direction on the other piece side;
Provided with a lever that is pivotally attached to the housing containing the contact switching mechanism, and is biased outwardly by a return spring,
At the time of turning operation or returning operation of the lever, an arc-shaped protrusion formed on the base end portion of the lever along the rotating direction presses and retreats the other side of the movable contact piece, A rotation switch that reverses and switches the contact portion formed on one side of the movable contact piece to the fixed contact piece side by elastically displacing the movable contact piece. A concave housing opened on one side and a cover for closing the opening surface are provided, and a conductive fixed contact piece and a movable contact piece are provided in the housing so as to be held and operated by the housing. A rotary switch that performs a switching operation by bringing a contact portion between the contact portions into contact with each other by applying a pressing force of a lever to the movable contact piece to displace the movable contact piece.
The housing is provided with a common fixed contact piece, and a first fixed contact piece and a second fixed contact piece arranged in parallel at both side positions sandwiching the common fixed contact piece,
A conductive leaf spring material is bent at a tilting fulcrum portion that is arranged perpendicular to the parallel arrangement direction of the fixed contact pieces and is urged against the common fixed contact piece side and supported to freely tilt in the orthogonal direction. A movable contact having a U-shaped intermediate position on one side and having a first movable contact portion and a second movable contact portion formed on both sides in the longitudinal direction of the one piece with the tilting fulcrum portion in the movable displacement direction of this one side interposed therebetween. A piece,
With the tilting fulcrum portion of the movable contact piece always in contact with the common fixed contact piece, the first fixed contact piece and the first movable contact portion facing each other are opposed to each other, and the other is opposed to the other. The movable contact piece is formed into a seesaw shape based on the pressing force of the lever that contacts the second fixed contact piece and the second movable contact portion along the outer surface longitudinal direction of the other piece of the movable contact piece. Provide a contact switching mechanism that reverses and switches,
Provided with a lever that is pivotally attached to the housing containing the contact switching mechanism, and is biased outwardly by a return spring,
At the time of turning operation or returning operation of the lever, an arc-shaped protrusion formed on the base end portion of the lever along the rotating direction presses and retreats the other side of the movable contact piece, Rotation that reverses and switches one of the first movable contact portion and the second movable contact portion formed on one side of the movable contact piece to the fixed contact piece side by elastically displacing the movable contact piece. switch. A concave housing opened on one side and a cover for closing the opening surface are provided, and a conductive fixed contact piece and a movable contact piece are provided in the housing so as to be held and operated by the housing. A rotary switch that performs a switching operation by bringing a contact portion of both opposed contact pieces into and out of contact by applying a pressing force of a lever to the movable contact piece and moving the movable contact piece in a seesaw shape.
A common fixed contact piece that is fixed to the housing with a fulcrum that supports the movable contact piece in a seesaw shape, and a fixed contact piece that is fixed to the housing in parallel separately from the common fixed contact piece,
A tilting fulcrum portion that is arranged perpendicular to the parallel arrangement direction of the fixed contact pieces, is urged against the fulcrum portion of the common fixed contact piece, and is supported to freely tilt in a seesaw shape in the orthogonal direction. A movable contact piece having a U-shaped one-side intermediate position obtained by bending a leaf spring material, and having a contact portion formed at a longitudinal end portion of the one-piece side with a tilting fulcrum portion in the movable-displacement direction of the one-piece side as a base point Provided,
Provided with a lever that is pivotally attached to the housing and is urged outwardly by a return spring,
With the tilting fulcrum portion of the movable contact piece always in contact with the fulcrum portion of the common fixed contact piece, the rotation direction of the lever at the base end portion when the lever is rotated or returned The arc-shaped protrusions that project along the side of the movable contact piece press and retract the other side of the movable contact piece and elastically displace the movable contact piece to form a contact portion formed on one side of the movable contact piece. Is reversed to the fixed contact piece side so that the contact between the contact portion of the fixed contact piece and the contact portion of the movable contact piece facing each other is pushed by the lever that makes contact along the outer surface longitudinal direction of the other piece of the movable contact piece. Provided with a contact switching mechanism that reverses and switches the movable contact piece into a seesaw shape based on pressure,
Provided on the inner wall surface of the housing on the fixed contact piece side opposite to both ends of the movable contact piece is an excessive tilt regulating protrusion that projects toward the movable contact piece side and restricts the tilt angle of the movable contact piece from excessive tilting. Rotating switch. A concave housing opened on one side and a cover for closing the opening surface are provided, and a conductive fixed contact piece and a movable contact piece are provided in the housing so as to be held and operated by the housing. A rotary switch that performs a switching operation by bringing a contact portion of both opposed contact pieces into and out of contact by applying a pressing force of a lever to the movable contact piece and moving the movable contact piece in a seesaw shape.
A common fixed contact piece provided with a fulcrum for supporting the movable contact piece in a seesaw shape and fixed to the housing, and a first fixed contact piece and a second fixed contact piece at both positions sandwiching the common fixed contact piece, respectively. Arranged in parallel,
A tilting fulcrum portion that is arranged perpendicular to the parallel arrangement direction of the fixed contact pieces, is urged against the fulcrum portion of the common fixed contact piece, and is supported to freely tilt in a seesaw shape in the orthogonal direction. A first movable contact portion and a second movable contact at both longitudinal positions on one side of the U-shaped one-sided intermediate position where the leaf spring material is bent and sandwiching the tilting fulcrum portion of the one-side movable displacement direction A movable contact piece that forms a part is provided,
Provided with a lever that is pivotally attached to the housing and is urged outwardly by a return spring,
With the tilting fulcrum part of the movable contact piece always in contact with the fulcrum part of the common fixed contact piece, the lever pivots to the base end of the pivoting lever when the pivoting lever is rotated or returned. An arc-shaped protrusion formed so as to protrude along the direction presses and retreats the other side of the movable contact piece and elastically displaces the movable contact piece to form a first one formed on one side of the movable contact piece. One of the movable contact portion and the second movable contact portion is switched by inverting the fixed contact piece side, the contact between the first fixed contact piece and the first movable contact portion facing each other, and the other The movable contact piece is moved to a seesaw based on the pressing force of the lever that contacts the second fixed contact piece and the second movable contact portion facing each other along the outer surface longitudinal direction of the other piece of the movable contact piece. Provide a contact switching mechanism that reverses and switches
Provided on the inner wall surface of the housing on the fixed contact piece side opposite to both ends of the movable contact piece is an excessive tilt regulating protrusion that projects toward the movable contact piece side and restricts the tilt angle of the movable contact piece from excessive tilting. Rotating switch. For the movable contact piece, one side of the U-shaped leaf spring material is set for contact contact, the other side is set for receiving external force, and the tilting fulcrum provided on the one side is attached to the fulcrum of the common fixed contact piece. tilt freely provided seesaw-like contact-energized pair, the open end of the other side, bent inwardly dogleg, claim 1, characterized in that formed in the dog-leg bent portion 4 The rotation switch of any one of these. For the movable contact piece, one side of the U-shaped leaf spring material is set for contact contact, the other side is set for receiving external force, and the tilting fulcrum provided on the one side is attached to the fulcrum of the common fixed contact piece. tilt freely provided seesaw-like contact-energized pair, to any one of claims 1 to 5, characterized in that a sliding contact projection projecting elongated along the longitudinal direction on the outer surface center portion of the other side The described rotary switch.

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