JP6276643B2 - Switch device and drive device - Google Patents

Description

  The present invention relates to a switch device that operates a detection member by a cam mechanism and a compression coil spring, and a drive device including the switch device.

  In a drawer driving device or an automatic ice maker that automatically opens a drawer of a refrigerator or the like, as described in Patent Documents 1 and 2, the operation of the driving device is detected by a switch device. Yes. As such a switch device, Patent Document 1 proposes a configuration in which a locking lever presses a leaf switch by a cam formed on a final gear.

  In Patent Document 2, the detection member (pressing member) is biased toward the switch by the compression coil spring, and the detection member is displaced against the biasing force of the compression coil spring when the switch is turned off. Has been proposed. According to such a configuration, unlike the technique described in Patent Document 1, it is possible to avoid a situation in which the timing at which the switch is turned on / off due to cam variation is shifted.

JP 2004-3789 A JP 2001-304733 A

  However, when the detection member is biased by the compression coil spring as in the configuration described in Patent Document 2, when the biasing force of the compression coil spring acts obliquely when the switch device and the drive device are assembled, the compression coil spring, Or there exists a problem that both a compression coil spring and a detection member will remove | deviate, and an assembly will take much effort.

  In view of the above problems, the problem of the present invention is to provide a switch device that can suppress the compression coil spring and the detection member from being detached by the biasing force of the compression coil spring when the compression coil spring that biases the detection member is incorporated. Another object of the present invention is to provide a driving device including the switch device.

  In order to solve the above-described problems, a switch device according to the present invention includes a switch, a detection member that is movable in a first direction that is separated from the switch, and a second direction that is close to the switch, and movement of the detection member. A fixing member having a detection member support portion that supports a supported portion of the detection member in a third direction orthogonal to the direction, a cam mechanism that moves the detection member in the first direction, and A first spring receiving portion disposed between the cam mechanism and the switch in the fixing member, and a first spring receiving portion and the switch in the detection member. A compression coil spring that elastically contacts both ends of a second spring receiving portion provided between the first spring receiving portion and at least one of the second spring receiving portion. The the side where detection member support portion is located part of the opposite side, characterized in that located on the side where the detecting member and the compression coil spring than the portion on the side where the support portion is located is disposed.

In the present invention, after the detection member is incorporated into the fixed member, the compression coil spring is incorporated between the first spring receiving portion and the second spring receiving portion from the side opposite to the detection member support portion. Here, at least one of the second spring receiving portion and the first spring receiving portion has a portion on the opposite side to the side where the detection member support portion is located, and a compression coil spring than the portion on the side where the detection member support portion is located. Located on the side where is located. For this reason, when the compression coil spring is incorporated, the portion on the opposite side to the side where the detection member support portion is located is greatly deformed. Therefore, the compression coil spring is bent toward the detection member support portion and is hardly bent toward the opposite side to the detection member support portion. Therefore, the compression coil spring is unlikely to be detached from the detection member support portion. Further, since the detection member is biased toward the detection member support portion, the detection member is also unlikely to come off. Further, even when the detection member is biased toward the detection member support portion, the displacement of the detection member is regulated by the detection member support portion, so that the position of the detection member is difficult to shift. Therefore, even after the compression coil spring is attached to the detection member, the position of the detection member does not shift, so that subsequent assembly operations can be easily performed.

  In this invention, the said detection member is provided with the side plate part which protruded toward the said 3rd direction from the said to-be-supported part, and the said fixing member opposes the said 3rd direction side with respect to the said side plate part, and the said side plate. It is preferable to provide a wall surface for receiving the portion. According to this structure, when the force which urges | biases a detection member to a wall surface side with a compression coil spring acted, a detection member will move, pressing on a wall surface side. For this reason, rattling of a detection member and the vibration resulting from this can be suppressed. Further, since the detection member hardly moves even under the influence of vibration or the like, a stable urging force can be applied to the switch side.

  In the present invention, in the second spring receiving portion, the portion opposite to the side where the detection member support portion is located is on the side where the compression coil spring is disposed from the portion on the side where the detection member support portion is located. The first spring receiving portion has a portion on the opposite side to the side where the detection member support portion is located and a portion on the side where the detection member support portion is located in the moving direction of the detection member. The configuration at the position can be adopted.

  In the present invention, in the second spring receiving portion, the portion opposite to the side where the detection member support portion is located is on the side where the compression coil spring is disposed from the portion on the side where the detection member support portion is located. The structure which becomes the inclined surface located in can be employ | adopted.

  In this invention, it is preferable that the spring insertion port for inserting the said compression coil spring into the inner side of the said detection member is opening in the surface on the opposite side to the said detection member support part of the said detection member. According to such a configuration, the compression coil spring can be arranged inside the detection member, so that a space for arranging the detection member and the compression coil spring can be reduced.

  In this invention, it is preferable that the said supported part is provided in the opposite side to the side by which the said compression coil spring is arrange | positioned with respect to the said 2nd spring receiving part. According to such a configuration, when the compression coil spring is incorporated, the urging force of the compression coil spring can effectively suppress the detection member from attempting to rotate around the second spring receiving portion. Therefore, the detection member and the compression coil spring are difficult to come off.

  In this invention, it is preferable that the distance from the said 2nd spring receiving part to the said to-be-supported part is shorter than the distance from the said 2nd spring receiving part to the location where the said detection member receives force in the said cam mechanism. According to such a configuration, when the compression coil spring is incorporated, the urging force of the compression coil spring can effectively suppress the detection member from attempting to rotate around the second spring receiving portion. Therefore, the detection member and the compression coil spring are difficult to come off.

  In this invention, it is preferable that the said 2nd spring receiving part is provided with the convex part protruded inside the said compression coil spring. According to this configuration, when the compression coil spring is incorporated, it is possible to suppress the compression coil spring from being detached from the second spring receiving portion.

  In the present invention, it is possible to adopt a configuration in which the switch is mounted on a substrate disposed in a direction orthogonal to the moving direction of the detection member. According to such a configuration, a configuration in which the detection member is pulled toward the switch with a tension spring from behind the switch cannot be employed, but since the compression coil spring is used, the detection member can be biased toward the switch.

  In a drive device including a switch device to which the present invention is applied, a motor is provided on a surface side of the board on which the switch is mounted, and an output of the motor is provided on a side opposite to the board with respect to the motor. It is preferable that a reduction gear train that transmits to the cam mechanism is disposed, and the motor is mounted on a surface of the substrate on which the switch is mounted. According to such a configuration, even when a reduction gear train is provided, a space for mounting the switch on the board can be easily secured.

  In the present invention, a rotating cam of the cam mechanism is formed, and a final gear to which rotation of the motor is transmitted via the reduction gear train and a position in parallel with the detecting member along the moving direction of the detecting member. And a rack driven by the final gear, and the detection member preferably moves in a direction perpendicular to the rotation center axis of the rotary cam. According to this configuration, the drive device can be reduced in size.

  In the present invention, the drive device is disposed between, for example, a side surface of a refrigerator drawer and the refrigerator main body, and is used for an application in which the rack drives the drawer when the drawer is pulled out and when the drawer is pushed in. Can do.

  In this invention, it is preferable that the said last gearwheel is arrange | positioned with respect to the said detection member at the front side of the said refrigerator main body, and the said switch is arrange | positioned with respect to the said detection member at the back side of the said refrigerator main body. According to this structure, wiring can be arrange | positioned at the back side of a refrigerator main body.

  In the present invention, each gear of the reduction gear train is oriented in a direction parallel to the rotation center axis of the final gear and perpendicular to the linear movement direction of the rack, and is orthogonal to the movement direction of the rack. When viewed from the direction, the rotation center axis of each gear of the reduction gear train is preferably disposed between the motor and the rotation center axis of the final gear. According to this configuration, the drive device can be reduced in size.

  In the present invention, a worm gear is fixed to the rotation shaft of the motor, and when viewed from a direction parallel to the moving direction of the rack, the rotation center axis of each gear of the reduction gear train is the rotation center of the rack and the worm gear. It is preferable to arrange | position between axis lines. According to this configuration, the drive device can be reduced in size.

In the present invention, after the detection member is incorporated into the fixed member, the compression coil spring is incorporated between the first spring receiving portion and the second spring receiving portion from the side opposite to the detection member support portion. Here, at least one of the second spring receiving portion and the first spring receiving portion has a portion on the opposite side to the side where the detection member support portion is located, and a compression coil spring than the portion on the side where the detection member support portion is located. Located on the side where is located. For this reason, when the compression coil spring is incorporated, the portion on the opposite side to the side where the detection member support portion is located is greatly deformed. Therefore, the compression coil spring is bent toward the detection member support portion and is hardly bent toward the opposite side to the detection member support portion. Therefore, the compression coil spring is unlikely to be detached from the detection member support portion. Further, since the detection member is biased toward the detection member support portion, the detection member is also unlikely to come off. Further, even when the detection member is biased toward the detection member support portion, the displacement of the detection member is regulated by the detection member support portion, so that the position of the detection member is difficult to shift. Therefore, even after the compression coil spring is attached to the detection member, the position of the detection member does not shift, so that subsequent assembly operations can be easily performed.

It is explanatory drawing which shows the mounting state to the refrigerator of the drawer drive device to which this invention is applied. It is a perspective view of the drawer drive device to which the present invention is applied. It is a side view of the state where the 2nd case was removed from the drawer drive device to which the present invention is applied. It is explanatory drawing of the switch apparatus comprised in the drawer drive device to which this invention is applied. It is explanatory drawing which shows the mounting structure of the compression coil spring in the switch apparatus comprised in the drawer drive device to which this invention is applied.

  A switch device and a drive device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, a case where the drive device is configured as a drawer drive device for a refrigerator will be exemplified. In the following description, the direction of movement of the detection member 6 and the rack 8 is the Y direction, the direction in which the detection member 6 and the rack 8 are parallel is the X direction, and the direction orthogonal to the X direction and the Y direction is Z. This will be described as a direction. Also, one side in the X direction is X1, the other side in the X direction is X2, one side in the Y direction is Y1, the other side in the Y direction is Y2, one side in the Z direction is Z1, and The other side will be described as Z2.

  In the present invention, the “first direction” is the other side Y2 in the Y direction, the “second direction” in the present invention is the one side Y1 in the Y direction, and the “third direction” is the Z direction. One side Z1.

(overall structure)
FIG. 1 is an explanatory view showing a state in which the drawer driving device 1 to which the present invention is applied is mounted on the refrigerator 100. FIG. 2 is a perspective view of the drawer driving device 1 to which the present invention is applied, FIG. 2A is a perspective view showing the appearance of the drawer driving device 1, and FIG. It is a perspective view which shows the inside.

  As shown in FIG. 1, the drawer drive device 1 according to the present embodiment is mounted on a refrigerator 100 and drives the drawer 101 when a refrigerator room, a freezer room, or a vegetable room serving as the drawer 101 is opened. The drawer 101 is slidably mounted on a pair of rails 102 extending in the front-rear direction on both sides in the width direction across the drawer 101 when the refrigerator 100 is viewed from the front surface (the other side Y2 in the Y direction). ing.

  A roller 104 is mounted on the outer frame portion 103 located on the rail 102 in the drawer 101, and the drawer 101 moves smoothly along the rail 102. The drawer 101 moves between a closed position 101 </ b> A where the box part 105 of the drawer 101 is stored in the refrigerator 100 and an open position 101 </ b> B where the box part 105 is arranged outside the refrigerator 100.

  In the refrigerator 100, in the refrigerator main body 110, an inclined rail portion 102a that is inclined downward toward the rear is provided at the rear end portion of the pair of rails 102. When the drawer 101 is disposed in the vicinity of the closed position 101A, the drawer 101 is in a state where the rear roller 104 is disposed on the inclined rail portion 102a, and moves rearward due to the weight of the drawer 101, and the closed position 101A. Placed in.

The drawer driving device 1 is disposed between the side surface of the drawer 101 and the side wall (not shown) of the refrigerator main body 110. When a switch (not shown) for opening the drawer 101 is operated, a drive signal is transmitted from the control unit 106 of the refrigerator 100 to the drawer driving device 1. The drawer drive device 1 operates in accordance with the drive signal, and pushes the drawer 101 in the closed position 101A in which the box portion 105 is housed in the refrigerator 100 to the open position 101C that is a predetermined distance away from the closed position 101A. The open position 101C is between the closed position 101A and the open position 101B and is close to the closed position 101A.

  As shown in FIG. 2A, the drawer driving device 1 has a case 2 having a rectangular parallelepiped shape as a whole. The case 2 includes a first case 3 (fixing member) and a second case 4 that are arranged so as to overlap in the width direction (Z direction) of the drawer driving device 1. An opening 5 is provided in the upper portion of the front surface 2a of the case 2 (the surface on the other side Y2 in the Y direction). From the opening 5, the tip of the rack 8 that pushes the drawer 101 forward protrudes outward. The state indicated by the solid line in FIG. 2A is a state where the rack 8 is positioned at the standby position 8A, and when the rack 8 pushes the drawer 101, the rack 8 reaches the protruding position 8B indicated by the two-dot chain line in FIG. Advance.

  The front end side of the rack 8 is a contact portion to the operated portion 107 (see FIG. 1) provided in the drawer 101. The operated portion 107 is a protruding portion that protrudes from the side surface of the box portion 105 of the drawer 101 in the width direction of the refrigerator 100 toward the drawer driving device 1. In such a drawer drive device 1, with the rack 8 placed at the standby position 8A, the front end side of the rack 8 contacts the operated portion 107 of the drawer 101 at the closed position 101A from the rear (one side Y1 in the Y direction). It is mounted at the installation position in contact (see FIG. 1).

  A wiring 190 is drawn from the case 2 toward the rear (one side Y1 in the Y direction). When a switch for opening the drawer 101 is operated, a drive signal is input to the drawer driving device 1 from the control unit 106 of the refrigerator 100 via the wiring 190. When the drive signal is input, the motor 11 (see FIG. 3) is driven, and the rack 8 advances straight from the standby position 8A to the protruding position 8B. Since the operated portion 107 of the drawer 101 is pushed forward by the movement of the rack 8, the drawer 101 is disposed at the open position 101C that is separated from the closed position 101A by the moving distance of the rack 8.

(Internal structure of drawer drive device 1)
FIG. 3 is a side view of the drawer drive device 1 to which the present invention is applied with the second case 4 removed, and FIG. 3A is a side view of the rack 8 in the standby position 8A. 3 (b) is a side view of the state in which the rack 8 is at the protruding position 8B.

  As shown in FIGS. 2B and 3, a rack 8 is mounted on the other side X <b> 2 in the X direction in the first case 3. The rack 8 extends in the Y direction, and a front end portion thereof (an end portion on the other side Y <b> 2 in the Y direction) projects forward from the front plate 12 of the first case 3. As shown in FIG. 3A, the rear end of the rack 8 is positioned in the vicinity of the rear plate 13 of the first case 3 in a state where the rack 8 is disposed at the standby position 8A. The rack 8 is supported by the case 2 while being slidable in the Y direction by a first linear motion guide 15 (see FIG. 3B) provided on the other side Z2 in the Z direction from the side plate 14 of the first case 3. Has been. A tooth portion 18 is provided on one side X1 of the rack 8 in the X direction.

A motor 11 is mounted on one side X <b> 1 in the X direction of the first case 3. The motor 11 is arranged such that its motor axis L0 extends to the other side Y2 in the Y direction. That is, the motor 11 is arranged such that the motor axis L0 is parallel to the linear movement direction (Y direction) of the rack 8. A substrate 19 made of a circuit board is disposed on one side Y <b> 1 in the Y direction that is the opposite output side of the motor 11. The substrate 19 extends in the X direction, and the motor 11 is mounted on the surface of the other side Y2 of the substrate 19 in the Y direction. On the surface of the substrate 19 on the other side Y2 in the Y direction, a switch 20 including a tactile switch is mounted on the other side X2 in the X direction.

  In a space on the other side Y <b> 2 in the Y direction with respect to the motor 11, a reduction wheel train 21 that reduces the rotation of the motor 11 and transmits it to the rack 8 is disposed. The reduction gear train 21 includes a first wheel 23 that meshes with a worm gear 22 fixed to the output shaft of the motor 11, and a second wheel 24 that meshes with the first wheel 23. 25 is engaged. The final gear 25 is disposed on the other side Y <b> 2 of the first case 3 in the Y direction and meshes with the teeth 18 of the rack 8. When the motor 11 is driven from the state shown in FIG. 3A and the final gear 25 makes one clockwise rotation in the CW direction, the rack 8 moves from the standby position 8A to the protruding position 8B shown in FIG. 3B. When the motor 11 rotates in the reverse direction from the state shown in FIG. 3B and the final gear 25 rotates once in the counterclockwise CCW direction, the rack 8 moves from the protruding position 8B to the standby position 8A shown in FIG. To do.

  The worm gear 22 is rotatably supported by a bearing 27 whose end opposite to the motor 11 is fixed to the first case 3. The first wheel 23 includes a large-diameter gear 31 that meshes with the worm gear 22 and a small-diameter gear 32 that is smaller in diameter than the large-diameter gear 31. A torque limiter 33 is configured between the large diameter gear 31 and the small diameter gear 32. The second wheel 24 includes a large-diameter gear 41 that meshes with the small-diameter gear 32 of the first wheel 23 and a small-diameter gear (not shown) having a smaller diameter than the large-diameter gear 41. The final gear 25 includes a large-diameter gear 51 that meshes with the small-diameter gear of the second wheel 24 and a small-diameter gear (not shown) having a smaller diameter than the large-diameter gear 51, and the small-diameter gear is the tooth portion 18 of the rack 8. Is engaged.

  The final gear 25 is provided with a rotating cam 53 coaxially with the large-diameter gear 51. The rotating cam 53 includes a protruding portion 54 that protrudes in a radial direction at one place in the circumferential direction, and constitutes a sliding portion 62a of the detection member 6 and a cam mechanism 50 described later.

  Here, each gear (first wheel 23 and second wheel 24) of the reduction gear train 21 has a rotation center axis L <b> 1 parallel to the rotation center axis L <b> 3 of the final gear 25 and perpendicular to the linear movement direction of the rack 8, L2 is turned. Further, when viewed from the X direction orthogonal to the moving direction of the rack 8, the rotation center axes L1 and L2 of the gears (the first wheel 23 and the second wheel 24) of the reduction gear train 21 are the motor 11 and the final gear. It arrange | positions between 25 rotation center axis L3. Further, when viewed from the Y direction parallel to the moving direction of the rack 8, the rotation center axes L1 and L2 of the respective gears (the first wheel 23 and the second wheel 24) of the reduction gear train 21 are the rotations of the rack 8 and the worm gear 22. It is arranged between the central axis L4. Therefore, the drawer drive device 1 can be downsized.

  Further, the motor 11 and the reduction gear train 21 are arranged on the side of the board 19 where the switch 20 is mounted. The reduction gear train 21 is arranged on the opposite side of the motor 19 from the board 19. Has been. Therefore, even when the reduction gear train 21 is provided on the surface of the board 19 on which the switch 20 is mounted, a space for mounting the switch 20 on the board 19 can be easily secured.

The rack 8 extends along the direction of movement of the detection member 6 at a position parallel to the detection member 6, and the detection member 6 extends in a direction orthogonal to the rotation center axis L3 of the final gear 25 (rotating cam 53). Moving. For this reason, size reduction of the drawer drive device 1 can be achieved. Further, the drawer driving device 1 has the rack 8 moving in the direction along the side surface of the drawer 101 between the side surface of the drawer 101 of the refrigerator 100 and the refrigerator main body 110. For this reason, since the space for installing the drawer driving device 1 can be reduced, the capacity of the drawer 101 can be increased. The final gear 25 is disposed on the front side of the refrigerator main body 110 with respect to the detection member 6, and the switch 20 is disposed on the rear side of the refrigerator main body 110 with respect to the detection member 6. For this reason, the wiring 190 can be arranged on the back side of the refrigerator main body 110. Therefore, it is easy to connect the wiring 190 to the control unit 106 provided on the back side of the refrigerator main body 110.

(Configuration of the detection member 6)
FIG. 4 is an explanatory diagram of the switch device 10 configured in the drawer driving device 1 to which the present invention is applied, FIG. 4A is an explanatory diagram of the switch device 10, and FIG. 4B is a switch device. 10 is an explanatory view showing a state in which the detection member 6 and the compression coil spring 9 are removed in FIG. 10, and FIG. 4C is a perspective view of the detection member 6 viewed from one side Z1 in the Z direction.

  As illustrated in FIGS. 2B, 3, and 4, the drawer driving device 1 includes a switch device 10 that detects an operation in the drawer driving device 1. The switch device 10 includes a switch 20 mounted on a substrate 19, a detection member 6 movable in the Y direction, a cam mechanism 50, and a compression coil spring 9. In this embodiment, the cam mechanism 50 moves the detection member 6 in a first direction (the other side Y2 in the Y direction) that is separated from the switch 20, and the compression coil spring 9 causes the detection member 6 to approach the switch 20 in the second direction. It is biased to (one side Y1 in the Y direction).

  The detection member 6 is disposed between the substrate 19 on which the switch 20 is mounted and the cam mechanism 50, and the other side Y2 (first direction) in the Y direction in which the switch 20 is turned off or on, and The switch 20 is movable to one side Y1 in the Y direction, which is the other of on and off. The moving direction (Y direction) of the detection member 6 is parallel to the moving direction of the rack 8. In this embodiment, when the detection member 6 moves to the other side Y2 (first direction) in the Y direction, the switch 20 is turned off, and when the detection member 6 moves to one side Y1 (second direction) in the Y direction, The switch 20 is turned on.

  The detection member 6 extends in the Y direction, an oval base 61 formed at the end of the other side Y2 in the Y direction, and an extension 69 extending from the base 61 to one side Y1 in the Y direction. have. The base portion 61 is formed with a long hole 63 penetrating in the Z direction and a sliding portion 62 a that slides on the rotating cam 53. The sliding portion 62 a is a peripheral wall surface of the concave portion 62 formed on the surface on the one side Z <b> 1 in the Z direction of the base portion 61 of the detection member 6. The long hole 63 passes through the bottom of the recess 62, and the rotating cam 53 is inserted into the recess 62 from the Z direction. As a result, the rotating cam 53 and the sliding portion 62a come into contact with each other, and the cam mechanism 50 is configured. The cam mechanism 50 moves the detection member 6 to the other side Y2 in the Y direction (first direction / direction in which the switch 20 is turned off).

  In the detection member 6, the extending portion 69 includes a bottom plate portion 691, a side plate portion 692 protruding from the outer edge of the bottom plate portion 691 to one side Z1 in the Z direction, and a side plate portion 692 facing each other in the X direction. And a reinforcing plate portion 693 connected at substantially the middle position. The end portion on one side Y <b> 1 in the Y direction of the extending portion 69 is an operation portion 64 that operates the switch 20 mounted on the substrate 19, and the detection member 6 is moved in the Y direction by the urging force of the compression coil spring 9. When moving to the one side Y1 (second direction), the operation unit 64 contacts the switch 20 and the switch 20 is turned on. The operation part 64 includes a switch contact part 641 facing the switch 20 on the other side Y2 in the Y direction, and a plate-like part 642 protruding from the switch contact part 641 to the switch 20 side (one side Y1 in the Y direction). It has.

  In the extending portion 69 of the detection member 6, the bottom plate portion 691 is formed with a spring insertion port 65 penetrating in the Z direction at a portion closer to the operation portion 64 than the reinforcing plate portion 693. The spring insertion port 65 is a rectangle whose long side extends in the Y direction.

(Configuration of compression coil spring 9 and spring receiving portion)
FIG. 5 is an explanatory view showing a mounting structure of the compression coil spring 9 in the switch device 10 configured in the drawer driving device 1 to which the present invention is applied. FIG. 5 (a) shows the second case 4 removed from the switch device 10. FIG. 6 is a YZ cross-sectional view in the state of being compressed, an enlarged cross-sectional view around the compression coil spring 9, and an enlarged cross-sectional view around the second spring receiving portion 680.

  As shown in FIGS. 4 and 5, the first case 3 is formed with a fixing member side plate portion 29 that protrudes to the other side Z2 in the Z direction and penetrates the other side Y2 of the spring insertion port 65 in the Y direction. The first spring receiving portion 290 that receives one end of the compression coil spring 9 is configured by the surface of the fixing member side plate portion 29 on one side Y1 in the Y direction. The first spring receiving portion 290 is located between the switch 20 and the cam mechanism 50. The detection member 6 is formed with a detection member side plate 68 that protrudes from one end Y1 in the Y direction of the spring insertion port 65 toward the one side Z1 in the Z direction. Are connected to the side plate portions 692 facing each other in the X direction. In the detection member side plate portion 68, the surface on the other side Y2 in the Y direction forms a second spring receiving portion 680 that receives the other end of the compression coil spring 9, and the second spring receiving portion 680 is the first spring receiving portion. It is located between 290 and the switch 20. Therefore, if the compression coil spring 9 is disposed between the fixed member side plate portion 29 and the detection member side plate portion 68, both ends of the compression coil spring 9 are elastic and contact the first spring receiving portion 290 and the second spring receiving portion 680. Touch. Therefore, the compression coil spring 9 biases the detection member 6 to one side Y1 in the Y direction (second direction / direction in which the switch 20 is turned on).

  Here, the first case 3 has a wall surface 28 at a position bent to the other side Z2 in the Z direction and adjacent to the detection member 6 on the one side Z1 in the Z direction. Further, the wall surface 28 has a detection member support portion 281 formed of a protruding portion extending in the Y direction at a position overlapping the detection member 6 on one side Z1 in the Z direction.

  The second spring receiving portion 680 has a convex portion 681 that protrudes to the other side Y2 in the Y direction and is located inside the compression coil spring 9, and a spring contact surface 682 that surrounds the convex portion 681. Further, the detection member side plate portion 68 has a supported portion 683 made of a notch at the edge of one side Z1 in the Z direction. The detection member 6 is supported by the detection member support portion 281 by the supported portion 683. However, it moves in the Y direction.

  4, the side plate portion 692 protruding from the outer edge of the bottom plate portion 691 of the detection member 6 to the one side Z1 in the Z direction moves in the Y direction while coming into contact with the wall surface 28 of the first case 3.

  Here, since the second spring receiving portion 680 (spring contact surface 682) is an inclined surface inclined toward the wall surface 28 side as described below with reference to FIGS. 5B and 5C, The urging force of the compression coil spring 9 acts to urge the detection member 6 toward the wall surface 28 side. Therefore, the detection member 6 moves in the Y direction while being always pressed against the wall surface 28 side.

In the second spring receiving portion 680 (spring contact surface 682) configured in this manner, the first portion 686 opposite to the side where the detection member support portion 281 is located is on the side where the detection member support portion 281 is located. It is located on the side where the compression coil spring 9 is disposed from the second portion 687. For this reason, between the 1st spring receiving part 290 and the 2nd spring receiving part 680, as for the compression coil spring 9, the part on the opposite side to the side in which the detection member support part 281 is located deform | transforms greatly. In this embodiment, in order to realize such a configuration, the second spring receiving portion 680 (spring contact surface 682) is configured such that the first portion 686 on the side opposite to the side where the detection member support portion 281 is located is the detection member support portion. It is an inclined surface located on the side where the compression coil spring 9 is disposed from the second portion 687 on the side where 281 is located. For example, the second spring receiving portion 680 (spring contact surface 682) is 7 with respect to a direction (Z direction) orthogonal to the moving direction of the detection member 6 (extension / contraction direction of the compression coil spring 9 / Y direction).
It is inclined at an angle θ of 10 ° to 10 °.

  On the other hand, in the first spring receiving portion 290, the compression coil spring 9 is disposed between the portion opposite to the side where the detection member support portion 281 is located and the portion where the detection member support portion 281 is located. On the same side. For this reason, the 1st spring receiving part 290 consists of a surface orthogonal to the moving direction (the expansion-contraction direction / Y direction of the compression coil spring 9) of the detection member 6. FIG.

  In the detection member 6 configured as described above, the supported portion 683 supported by the detection member support portion 281 is formed by a notch formed at the edge of the detection member side plate portion 68, and thus the second spring receiving portion 680 has On the other hand, it is provided on the side opposite to the side where the compression coil spring 9 is disposed. Further, the distance La from the second spring receiving portion 680 to the supported portion 683 is shorter than the distance Lb from the second spring receiving portion 680 to the location (sliding portion 62a) where the detection member 6 receives force in the cam mechanism 50. .

(Operation of drawer drive unit)
With reference to FIGS. 1 and 3, the opening operation in which the drawer driving device 1 opens the drawer 101 will be described. First, it is assumed that the drawer 101 is disposed at the closed position 101A as shown by a solid line in FIG. In addition, as shown in FIG. 3A, the drawer drive device 1 has its rack 8 disposed at the standby position 8A. The front end side of the rack 8 is in contact with the operated portion 107 provided in the drawer 101 from the rear.

  In this state, when a switch for opening the drawer 101 is operated, a drive signal is input from the control unit 106 of the refrigerator 100 via the wiring 190. As a result, the motor 11 is driven in the first direction. The rotation of the motor 11 in the first direction is transmitted to the final gear 25 while being decelerated via the worm gear 22, the first wheel 23 and the second wheel 24. As a result, when the final gear 25 makes one clockwise rotation in the CW direction, the rack 8 moves from the standby position 8A to the protruding position 8B shown in FIG. As the rack 8 moves, the drawer 101 is pushed from the closed position 101A shown in FIG. 1 to the open position 101C.

  Here, while the final gear 25 makes one rotation in the CW direction, the detection member 6 reciprocates in the Y direction, and the switch 20 is changed from the off state to the off state again from the on state. When the switch 20 returns to the off state, the control device of the refrigerator 100 determines that the rack 8 has reached the protruding position 8B, and drives the motor 11 in the second direction opposite to the first direction.

  The rotation of the motor 11 in the second direction is transmitted to the final gear 25 while being decelerated via the worm gear 22, the first wheel 23 and the second wheel 24. As a result, when the final gear 25 rotates once counterclockwise in the CCW direction, the rack 8 returns from the protruding position 8B to the standby position 8A shown in FIG.

  If the user pushes the drawer 101 toward the refrigerator 100 after the rack 8 is placed at the standby position 8A, the drawer 101 moves to the closed position 101A without interfering with the rack 8. Therefore, the user can close the drawer 101 with a light force.

(Operation in the switch device 10)
While the final gear 25 rotates once in the clockwise CW direction, the rotating cam 53 also rotates once in the CW direction. When the rotating cam 53 rotates, when the protrusion 54 of the rotating cam 53 reaches the other side Y2 in the Y direction, it comes into contact with the sliding part 62a and moves the detection member 6 to the other side Y2 in the Y direction. Thereafter, when the protrusion 54 rotates, the detection member 6 moves to one side Y1 in the Y direction by the urging force of the compression coil spring 9. In the meantime, the detection member 6 returns from the separated position where the operation unit 64 is separated from the switch 20 to the separated position where the operation unit 64 is separated from the switch 20 via the pressing position where the operation unit 64 presses the switch 20. . Therefore, while the final gear 25 makes one rotation, the switch 20 returns from the off state to the on state and then returns to the off state. A signal based on the state of the switch 20 is input to the control unit 106 of the refrigerator 100 via the wiring 190. When the switch 20 is off, the control unit 106 of the refrigerator 100 detects that the rack 8 is disposed at either the standby position 8A or the protruding position 8B.

(Main effects of this form)
As described above, in the switch device 10 and the drawer driving device 1 of the present embodiment, the compression coil spring 9 disposed so as to expand and contract along the moving direction (Y direction) of the detection member 6 is provided in the second case 4. Both ends of the first spring receiving portion 290 and the second spring receiving portion 680 provided on the detection member 6 are in elastic contact with each other. Here, of the first spring receiving portion 290 and the second spring receiving portion 680, the second spring receiving portion 680 is configured such that the first portion 686 on the opposite side to the side where the detecting member supporting portion 281 is located is the detecting member supporting portion. It is located on the side where the compression coil spring 9 is disposed from the second portion 687 on the side where the portion 281 is located. Therefore, when the compression coil spring 9 is assembled between the first spring receiving portion 290 and the second spring receiving portion 680 from the side opposite to the detection member support portion 281, the detection member support portion 281 is positioned in the compression coil spring 9. The part opposite to the side is greatly deformed. Therefore, the compression coil spring 9 bends toward the detection member support portion 281 and hardly bends to the opposite side to the detection member support portion 281, and the compression coil spring 9 is unlikely to come off to the opposite side from the detection member support portion 281. Moreover, since the detection member 6 is urged | biased by the detection member support part 281 side, the detection member 6 is hard to remove | deviate. Even when the detection member 6 is biased toward the detection member support portion 281, the displacement of the detection member 6 is restricted by the detection member support portion 281, so that the position of the detection member 6 is not easily displaced. Therefore, even after the compression coil spring 9 is attached to the detection member 6, the position of the detection member 6 does not shift, so that the subsequent assembly work can be easily performed.

  The detection member 6 includes a side plate portion 692 that protrudes from the supported portion 683 toward the one side Z1 in the Z direction, and the first case 3 (fixing member) is one side in the Z direction with respect to the side plate portion 692. A wall surface 28 that receives the side plate portion 692 is provided opposite to Z1. Therefore, the side plate portion 692 that protrudes from the outer edge of the bottom plate portion 691 of the detection member 6 to the one side Z1 in the Z direction moves in the Y direction while contacting the wall surface 28 of the first case 3. At that time, the urging force of the compression coil spring 9 acts to urge the detection member 6 toward the wall surface 28. For this reason, the detection member 6 always moves in the Y direction while being pressed against the wall surface 28 side, and thus it is possible to suppress rattling of the detection member 6 and vibrations resulting therefrom. Further, since the detection member 6 is difficult to move even under the influence of vibration or the like, a stable urging force can be applied to the switch 20 side.

  Further, in the second spring receiving portion 680, the first portion 686 on the side opposite to the side where the detection member support portion 281 is located, and the compression coil spring 9 is arranged from the second portion 687 on the side where the detection member support portion 281 is located. It is an inclined surface located on the side where it is done. For this reason, since the whole edge part of the compression coil spring 9 contact | abuts to the 2nd spring receiving part 680, it can avoid that the compression coil spring 9 deform | transforms large locally.

  Further, on the surface of the detection member 6 opposite to the detection member support portion 281, a spring insertion opening 65 for inserting the compression coil spring 9 into the detection member 6 is opened. For this reason, after arrange | positioning the detection member 6, the compression coil spring 9 can be arrange | positioned inside the detection member 6. FIG. Therefore, the space for arranging the detection member 6 and the compression coil spring 9 can be reduced.

Further, the supported portion 683 supported by the detection member support portion 281 in the detection member 6 is provided on the side opposite to the side where the compression coil spring 9 is disposed with respect to the second spring receiving portion 680. Further, the distance La from the second spring receiving portion 680 to the supported portion 683 is a place where the detection member 6 receives a force from the second spring receiving portion 680 in the cam mechanism 50 (sliding portion 62a).
Shorter than the distance Lb. For this reason, when the compression coil spring 9 is assembled, the biasing force of the compression coil spring 9 can effectively suppress the detection member 6 from rotating about the second spring receiving portion 680. Therefore, the detection member 6 and the compression coil spring 9 are not easily detached.

  Moreover, since the 2nd spring receiving part 680 is provided with the convex part 681 which protruded inside the compression coil spring 9, when incorporating the compression coil spring 9, it suppresses that the compression coil spring 9 remove | deviates from the 2nd spring reception part 680. be able to.

  Further, the switch 20 is mounted on a substrate 19 arranged in a direction orthogonal to the moving direction of the detection member 6. In addition, the substrate 19 is disposed further to the outside than the region overlapping the detection member 6 when viewed from the Y direction. For this reason, a configuration in which the detection member 6 is pulled toward the switch 20 with a tension spring from behind the switch 20 cannot be adopted. However, in this embodiment, the compression coil spring 9 is used, so the detection member 6 is attached to the switch 20. You can

(Other embodiments)
In the above embodiment, in the second spring receiving portion 680, the first portion 686 opposite to the side where the detection member support portion 281 is located is compressed more than the second portion 687 on the side where the detection member support portion 281 is located. In setting it as the structure located in the side by which the coil spring 9 is arrange | positioned, the 2nd spring receiving part 680 was made into the inclined surface. However, the second spring receiving portion 680 is provided with a step portion, and the first portion 686 on the side opposite to the side where the detection member support portion 281 is located is compressed more than the second portion 687 on the side where the detection member support portion 281 is located. It is good also as a convex part which protruded toward the side by which the coil spring 9 is arrange | positioned.

  In the above embodiment, in the second spring receiving portion 680, the first portion 686 opposite to the side where the detection member support portion 281 is located is compressed more than the second portion 687 on the side where the detection member support portion 281 is located. In the first spring receiving portion 290, the first portion on the opposite side to the side where the detection member support portion 281 is located is the position where the detection member support portion 281 is located. It is good also as a structure located in the side by which the compression coil spring 9 is arrange | positioned from the 2nd part of the side to perform.

1 drawer drive 3 first case (fixing member)
6 Detection member 8 Rack 9 Compression coil spring 10 Switch device 19 Substrate 20 Switch 21 Deceleration wheel train 50 Cam mechanism 53 Rotating cam 62a Sliding portion 65 Spring insertion port 100 Refrigerator 101 Drawer 110 Refrigerator body 281 Detection member support portion 290 First spring support Portion 680 Second spring receiving portion 683 Supported portion 686 First portion 687 opposite to the side where the detection member support portion is located Second portion where the detection member support portion is located

Claims (15)

A switch,
A detection member movable in a first direction away from the switch and in a second direction approaching the switch;
A fixing member including a detection member support portion that supports a supported portion of the detection member in a third direction orthogonal to the moving direction of the detection member;
A cam mechanism for moving the detection member in the first direction;
A first spring receiving portion arranged between the cam mechanism and the switch in the fixed member, and the first spring receiving portion in the detection member, arranged to extend and contract along the moving direction of the detection member And a compression coil spring whose both ends elastically contact a second spring receiving portion provided between the switch and the switch,
Have
At least one of the first spring receiving portion and the second spring receiving portion has a portion on the opposite side to the side where the detection member support portion is located, than the portion on the side where the detection member support portion is located. A switch device, wherein the switch device is located on a side where a compression coil spring is disposed. The detection member includes a side plate portion protruding in the third direction from the supported portion,
The switch device according to claim 1, wherein the fixing member includes a wall surface facing the side plate portion on the third direction side to receive the side plate portion. The second spring receiving portion is located on the side where the compression coil spring is disposed, on the side opposite to the side where the detection member support portion is located, than on the side where the detection member support portion is located,
In the first spring receiving portion, the portion opposite to the side where the detection member support portion is located and the portion on the side where the detection member support portion is located are in the same position in the moving direction of the detection member. The switch device according to claim 1 or 2, characterized by the above-mentioned.   The second spring receiving portion is inclined such that a portion on the side opposite to the side on which the detection member support portion is located is located closer to the side where the compression coil spring is disposed than a portion on the side on which the detection member support portion is located. The switch device according to claim 3, wherein the switch device is a surface.   The spring insertion port for inserting the said compression coil spring into the inner side of the said detection member is opened in the surface on the opposite side to the said detection member support part of the said detection member, The Claim 3 or 4 characterized by the above-mentioned. The switch device described.   The said supported part is provided in the opposite side to the side by which the said compression coil spring is arrange | positioned with respect to the said 2nd spring receiving part, The Claim 3 thru | or 5 characterized by the above-mentioned. Switch device.   The distance from the second spring receiving portion to the supported portion is shorter than a distance from the second spring receiving portion to a location where the detection member receives a force in the cam mechanism. Switch device.   The switch device according to any one of claims 3 to 7, wherein the second spring receiving portion includes a convex portion projecting inside the compression coil spring.   The switch device according to any one of claims 3 to 8, wherein the switch is mounted on a substrate disposed in a direction orthogonal to a moving direction of the detection member. A drive device comprising the switch device according to claim 9,
On the side of the board on which the switch is mounted, a motor and a reduction wheel train that transmits the output of the motor to the cam mechanism on the opposite side of the board to the motor are arranged.
The motor is mounted on the surface of the substrate on which the switch is mounted. A final gear in which a rotating cam of the cam mechanism is formed, and rotation of the motor is transmitted via the reduction gear train;
A rack that extends along the direction of movement of the detection member at a position parallel to the detection member and is driven by the final gear;
Have
The drive device according to claim 10, wherein the detection member moves in a direction orthogonal to a rotation center axis of the rotary cam. It is placed between the side of the refrigerator drawer and the refrigerator body,
The driving device according to claim 10 or 11, wherein the rack drives the drawer when the drawer is pulled out and when the drawer is pushed in. The final gear is arranged on the front side of the refrigerator body with respect to the detection member,
The drive device according to claim 12, wherein the switch is disposed on a back side of the refrigerator main body with respect to the detection member. Each gear of the reduction gear train has its rotation center axis oriented in a direction parallel to the rotation center axis of the final gear and perpendicular to the linear movement direction of the rack,
14. Each of the gears of the reduction gear train is disposed between the motor and the final gear when viewed from a direction perpendicular to the moving direction of the rack. The driving device according to claim 1. A worm gear is fixed to the rotating shaft of the motor,
15. The rotation center axis of each gear of the reduction gear train is disposed between the rack and the worm gear when viewed from a direction parallel to the moving direction of the rack. The drive device as described in any one.

Images