JP6219707B2 - Detection switch - Google Patents

Description

  The present invention relates to a detection switch for detecting a mechanical operation and an operation state.

  As a conventional detection switch of this type, there is a general brake switch in a parking brake device. For example, there is a switch provided in the vehicle operation lever device shown in Patent Document 1.

In other words, the first output link constituting the operating force transmission mechanism of the operating lever is provided with a protruding portion on the lower end edge side relative to the pivot serving as the rotation center, and this protruding portion is operated as a push button of the switch by operating the operating lever. Thus, it is possible to detect the state in which the operation lever is raised. This switch moves in the direction when the protruding portion of the first output link pushes the push button, and moves in the reverse direction to the original position by the biasing force when moving in the direction in which the protruding portion moves away.
That is, the push button reciprocates in a certain direction during switching. This switching information is sent to an electrically connected control unit.

JP 2007-286929 A

  By the way, in such a conventional technique, the electrical contact portions of the anode terminal and the ground terminal by switching are always the same portion. A discharge occurs during switching. For this reason, when the switching operation exceeds 100,000 times or 200,000 times, a copper oxide film, a silicon oxide film or the like is generated by the terminal or other material at the contact portion of the terminal. Then, there was a problem that conduction failure occurred and current could not flow.

  Further, since the contact portion is exposed, dust and dust adhere to the contact portion, which also causes a conduction failure.

  The present invention has been made by paying attention to such problems of the conventional technology, and provides a detection switch that is highly dustproof and can prevent the occurrence of poor continuity even if the number of times of switching increases. The purpose is to do.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] In the detection switch (1) for detecting the mechanical operation and the operation state,
The anode terminal (20) and the ground terminal (30) assembled to the casing (10) and the casing (10) are housed in the casing (10), and the tip (41) is biased in the direction protruding from the outside of the casing (10). An electrically conductive movable terminal (40) supported in a swingable manner.
The movable terminal (40) receives transmission of a mechanical operation at the tip (41) and swings in the process of mechanical operation, and the anode terminal (20) and the ground terminal (30) over a predetermined range. The detection switch (1) is configured to come into contact with the anode terminal (20) and the ground terminal (30) when the operation state is in a predetermined state. ).

[2] In the detection switch (1) for detecting the mechanical operation and the operation state,
An anode terminal (20) and a ground terminal (30) assembled to the casing (10), an anode terminal contact portion (47) capable of contacting the anode terminal (20) over a predetermined range, and the ground over a predetermined range It has an anti-earth terminal contact portion (48) that can contact the terminal (30), and has a conductivity incorporated in the casing (10) so that the tip end (41) side protrudes to the outside of the casing (10). The movable terminal (40) having the movable terminal (40) is urged in the casing (10) so as to project the distal end (41) side of the movable terminal (40) to the outside, and the movable terminal (40) is swingably supported. An urging member (50)
The movable terminal (40) receives transmission of mechanical motion at the distal end surface of the distal end portion (41) and swings in the course of mechanical operation, so that most of the counter anode contact point portion (47) is When the contact with the anode terminal (20) is rubbed, and most of the contact terminal (48) with respect to the ground terminal is rubbed with the ground terminal (30), and the operation state is a predetermined state, A part of the contact point part for the anode terminal (47) is in contact with the anode terminal (20), and a part of the contact point part for the ground terminal (48) is in contact with the ground terminal (30). Feature detection switch (1).

[3] What is the anode contact portion (21a) where the anode terminal (20) contacts the movable terminal (40) and the ground contact portion (31a) where the ground terminal (30) contacts the movable terminal (40)? Are arranged at predetermined intervals in the casing (10),
The movable terminal (40) has a distal end portion (41) extending between curved shoulder portions (43a, 43b) provided on both sides of the base end portion (42), and the shoulder portions (43a, 43b) on both sides. 43b) leg portions (44, 44) for restricting the swinging amount of the movable terminal (40) extending in a direction opposite to the extending direction of the tip end portion (41) from each of the leg portions (44, 44). A biasing member receiving portion (45) provided between and supported by receiving a biasing force from the biasing member (50),
The distal end portion (41) has a curved end surface.
The opposite anode terminal contact portion (47) is formed on the shoulder portion (43a) closer to the anode terminal (20) of the shoulder portions (43a, 43b), and the shoulder portions (43a, 43b) The detection switch (1) according to item [2], wherein the ground terminal contact portion (48) is formed on a shoulder portion (43b) closer to the ground terminal (30).

[4] The anode terminal contact portion (47) and the earth terminal contact portion (48) and the curved surface of the tip surface of the tip portion (41) are a part of a spherical surface of a concentric sphere or a concentric cylinder. The detection switch (1) according to item [2] or [3], characterized in that the detection switch (1) is formed as a part of a circumferential surface.

The present invention operates as follows.
According to the detection switch (1) of the item [1], since the distal end portion (41) of the movable terminal (40) receives transmission of the mechanical operation, the force received by the distal end portion (41) is in the process of the mechanical operation. As a result, the movable terminal (40) swings in the casing (10). By this swinging, the movable terminal (40) contacts the anode terminal (20) and the ground terminal (30) assembled to the casing (10) so as to rub over a predetermined range.

  Thereby, even if copper oxide etc. are produced | generated over a predetermined range by switching operation | movement, a movable terminal (40) is the anode terminal (20) and earthing terminal (30) each time the predetermined range receives transmission of mechanical operation. Since they rub against each other, the copper oxide is scraped immediately before the copper oxide film that causes conduction failure is formed. Therefore, even if the number of times of switching increases, conduction failure does not occur. In addition, since the movable terminal (40) is accommodated in the casing (10), the contact with the anode terminal (20) and the ground terminal (30) is positioned in the casing (10), so that the contact Thus, it is possible to provide a detection switch (1) having excellent dustproofness, in which dust and dust are difficult to adhere to.

  According to the detection switch (1) of item [2], the movable terminal (40) contacts the anode terminal contact portion (47) with the anode terminal (20) assembled to the casing (10). The portion where the counter anode contact portion (47) is in contact with the anode terminal (20) is in contact over a predetermined range rather than at one location. Similarly, the portion where the ground terminal contact portion (48) contacts the ground terminal (30) is not in one place but in a predetermined range.

  The movable terminal (40) is swingably supported and biased by the biasing member (50), and the tip end portion (41) protrudes outside the casing (10). Then, the mechanical movement is received at the distal end surface of the distal end portion (41). In the process of mechanical movement, the force applied to the tip surface changes, so that it swings. Thereby, most of the counter-anode terminal contact portion (47) comes into contact with the anode terminal (20) so as to rub, and most of the counter-ground terminal contact portion (48) comes into contact with the ground terminal (30). . As a result, the anti-anode terminal contact portion (47) and the anti-ground terminal contact portion (48) are maintained in a state of being polished at all times. Can be prevented, and excellent dust resistance can be exhibited.

  When the operation state is a predetermined state, a part of the contact terminal part (47) with respect to the anode terminal contacts the anode terminal (20), and a part of contact part (48) with respect to the ground terminal contacts the ground terminal (30). To do. By this contact, it can be detected that the operation state is a predetermined state.

  According to the detection switch (1) of item [3], the anode contact (21a) where the anode terminal (20) contacts the movable terminal (40) and the ground where the ground terminal (30) contacts the movable terminal (40). The contact part (31a) is arranged at a predetermined interval in the casing (10). The movable terminal (40) has a distal end portion (41) extending between curved shoulder portions (43a, 43b) provided on both sides of the base end portion (42).

  The distal end surface of the distal end portion (41) of the movable terminal (40) is formed in a curved surface shape. Further, the biasing member receiving portion (45) formed between the leg portions (44, 44) extending in the direction opposite to the extending direction of the distal end portion (41) from the shoulder portions (43a, 43b) on both sides is biased. Since the urging force from the member (50) is received and supported, the movable terminal (40) can easily swing when receiving the transmission of the mechanical operation at the distal end surface of the distal end portion (41).

  The swinging amount of the movable terminal (40) is limited by the leg portions (44, 44). The leg portions (44, 44) hit the inner wall of the space in the casing (10) housing the movable terminal (40) when the movable terminal (40) swings to a predetermined size. Is set so that it cannot swing further.

  Like the detection switch (1) of the item [4], the anti-anode terminal contact portion (47) and the anti-earth terminal contact portion (48) and the curved surface of the tip surface of the tip portion (41) are concentric spherical surfaces. By forming it as a part or a part of the circumferential surface of the concentric cylinder, the movable terminal (40) can be swung appropriately.

  According to the detection switch of the present invention, since the movable terminal contacts with the anode terminal and the ground terminal while swinging in the process of mechanical operation, the contact surface between the movable terminal, the anode terminal and the ground terminal is brought into poor conduction. The formation of such an oxide film can be prevented, and hence the occurrence of poor conduction can be prevented even if the number of times of switching increases.

  In addition, since the contact between the movable terminal, the anode terminal, and the ground terminal can be performed in the casing, it is possible to substantially prevent dust and dust from adhering to the contact surface between the movable terminal, the anode terminal, and the ground terminal. Therefore, it is possible to prevent the occurrence of poor conduction due to the adhesion of dust and dust to the contact surface.

1 is a perspective view showing a brake switch according to an embodiment of the present invention. It is a front view which shows the casing in FIG. It is a top view which shows the casing in FIG. It is a right view which shows the casing in FIG. The anode terminal in FIG. 1 is shown, (A) is a front view, (B) is a plan view, and (C) is a left side view. The grounding terminal in FIG. 1 is shown, (A) is a front view, (B) is a bottom view, and (C) is a left side view. It is a disassembled perspective view which shows the brake switch which concerns on one embodiment of this invention. It is a perspective view which shows the assembly | attachment of the brake switch which concerns on one embodiment of this invention. It is a figure which shows the movable terminal in FIG. It is explanatory drawing which shows the process in which brake lever operation is transmitted and a brake switch act | operates. It is explanatory drawing which expands and shows the wiping by rocking | fluctuating a movable terminal. It is a cross-sectional perspective view which shows the inside of the storage space at the time of attaching the bending prevention piece for preventing the bending of a coil spring to a movable terminal. It is a perspective view which shows an example of a different shape of a movable terminal. It is a top view which shows the movable terminal of FIG. It is a perspective view which shows the modification of an anode terminal and a casing.

The present invention relates to a detection switch for detecting a mechanical operation and an operation state.
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
Each figure shows an embodiment of the present invention.

Hereinafter, a case where the detection switch is used as a switch for detecting that the parking brake device is in a braking state from the operation of the brake lever will be described as an example.
The brake switch 1 according to the present invention shown in each perspective view of FIGS. 1, 7, and 8 is provided in a parking brake device to detect that the parking brake device is in a braking state from the operation of the brake lever. It is a switch. The brake switch 1 includes a casing 10 shown in FIGS. 2 to 4 and the like, and each component is assembled to the casing 10.

The casing 10 is assembled with an anode terminal 20, a ground terminal 30, a movable terminal 40, a coil spring 50 that urges the movable terminal 40 and supports it so as to be swingable.
The casing 10 is integrally molded by resin molding. The casing 10 is formed with an accommodation space 11 for accommodating the movable terminal 40 therein.

  The casing 10 includes a terminal attachment portion 12 for attaching the anode terminal 20 and the ground terminal 30, and a coil spring accommodation portion 13 that extends continuously from one side surface of the terminal attachment portion 12 and accommodates the coil spring 50 therein. ing. The housing space 11 is formed as a space that continues from the terminal mounting portion 12 to the coil spring housing portion 13 through the inside thereof. The accommodating space 11 in the coil spring accommodating portion 13 is formed in a shape whose inner diameter is slightly larger than the diameter of the coil spring 50.

  On the other side surface of the terminal mounting portion 12, the movable terminal 40 and the coil spring 50 are accommodated when assembled, and an opening 14 from which the distal end portion 41 of the movable terminal 40 urged by the coil spring 50 projects after the accommodation is provided. ing. The opening 14 includes a circular opening portion slightly larger than the diameter of the coil spring 50 in the center and a narrow opening portion extending in both diametrical directions of the circular opening portion and slightly wider than the width of the movable terminal 40. On the upper surface side of the terminal mounting portion 12, a ground terminal mounting portion 15 into which a ground terminal 30 to be described later is inserted is formed.

  The anode terminal 20 assembled to the casing 10 is a plate-shaped member made of a conductive material such as copper. The anode terminal 20 has, for example, the shape shown in FIGS. 5A, 5 </ b> B, and 5 </ b> C, and includes an insertion portion 21 to be inserted into the casing 10 and a connection portion 22 to which an electric wire is connected. Is formed. The insertion tip of the insertion part 21 is an anode contact part 21a with which a movable terminal 40 described later contacts. The anode contact portion 21 a is disposed at a position where it can come into contact with the movable terminal 40 in the accommodation space 11.

  The insertion portion 21 is provided with a mounting hole 23 for inserting a mounting tapping screw 60 for fixing to the casing 10. The anode terminal 20 is inserted and fixed from one end surface side of the terminal mounting portion 12.

  The ground terminal 30 is inserted from the other end face side of the terminal mounting portion 12. The ground terminal 30 has, for example, the shape shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C. The ground terminal 30 is inserted into the ground terminal mounting portion 15 of the casing 10 and attached, and the accommodating space. 11 has a ground contact portion 31a disposed at a position where it can come into contact with the movable terminal 40.

  The movable terminal 40 accommodated in the casing 10 is made of a conductive material such as copper. As shown in FIG. 1, FIG. 7, FIG. 8, FIG. 10, etc., the movable terminal 40 is formed in a symmetrical plate shape. The movable terminal 40 has a distal end portion 41 extending from between shoulder portions 43 a and 43 b formed on both sides of the base end portion 42.

The distal end portion 41 has a distal end surface formed in an arc shape. The tip surface is not limited to an arc shape, and may be another curved surface shape.
As schematically shown schematically in FIG. 12, a switch pad 100 that transmits the brake lever operation to the movable terminal 40 in contact with the brake lever operation is in contact with the distal end surface.

  When the brake lever is tilted and the parking brake device is released, the switch pad 100 pushes the distal end portion 41 into the casing 10 and pulls the brake lever so that the distal end portion 41 is moved outward from the opening 14 by the biasing force of the coil spring 50. The brake lever operation is transmitted to the distal end surface of the distal end portion 41 in conjunction with the brake lever operation so that it can protrude. As will be described later, when the parking brake device is released from the braking state, the switch pad 100 pushes the movable terminal 40 into the casing 10.

  Each of the shoulder portion 43a and the shoulder portion 43b is formed in an arcuate curved surface. On the shoulder 43a closer to the anode terminal 20, a counter-anode terminal contact portion 47 that can contact the anode contact portion 21a of the anode terminal 20 is formed over a predetermined range. The shoulder 43b closer to the ground terminal 30 is formed with an anti-ground terminal contact portion 48 that can contact the ground contact portion 31a of the ground terminal 30 over a predetermined range.

  As shown in FIG. 1, FIG. 9, FIG. 12, etc., the anode contact portion 21a and the ground contact portion 31a are arranged at a predetermined interval in the casing 10, and the anode contact portion 21a and the ground contact portion are grounded. A tip portion 41 extends between the contact portion 31a. The shoulder 43a and the shoulder 43b are not limited to an arcuate curved surface, but may be other curved surfaces.

  Legs 44, 44 extend from the shoulder 43a and the shoulder 43b on both sides in the direction opposite to the direction in which the tip 41 extends. The width between the outer side edges of both the leg portions 44, 44 is wider than the width between both side edges of the tip end portion 41. The leg portions 44 and 44 thus formed are portions that appropriately limit the swing amount of the movable terminal 40 by hitting the inner wall of the accommodation space 11 when the movable terminal 40 swings.

  A coil spring receiving portion 45 extends from between the leg portions 44, 44 in the direction opposite to the direction in which the distal end portion 41 extends. The coil spring receiving portion 45 is a portion that receives one end of the coil spring 50 and receives a biasing force from the coil spring 50 and is supported by the coil spring 50. The other end of the coil spring 50 is in contact with the inner wall of the housing space 11 inside the coil spring housing 13, that is, in the state of being assembled to the casing 10. .

  In FIG. 9, the contact terminal 47 of the movable terminal 40 contacts the anode contact 21 a of the anode terminal 20, and the contact terminal 48 of the movable terminal 40 contacts the ground contact 31 a of the ground terminal 30. In this state, the tip portion 41 is close to the anode contact portion 21a side. Here, O is a center point of a circle of the arc-shaped shoulder portion 43a (to the anode terminal contact portion 47) and the shoulder portion 43b (to the ground terminal contact portion 48), and R is a radius thereof. B indicates the distance from the point where one end of the coil spring 50 is in contact with the portion near the shoulder 43a of the coil spring receiving portion 45 to the center point O.

  The angle θ indicates a direction perpendicular to the direction from the center point O toward the contact point, and the angle θ ′ indicates the direction of the center line of the coil spring 50 passing through the center point O and the center point O. This is the angle formed with the direction toward the point of contact. The point where the contact point 48 is in contact with the ground contact 31a, the contact point a, the point where the contact point 47 is in contact with the anode contact point 21a is the contact point b, and the friction coefficient is μ. , B is obtained as follows.

The friction generated at the contacts a and b is 2 · W · cosθ · μ, the moment generated by the friction is 2 · W · cosθ · μ · R, and the moment generated at the movable terminal 40 is W · B · sinθ '. Therefore, the conditions for sliding the contacts a and b are as follows:
sinθ´> (2 ・ W ・ cosθ ・ μ ・ R) / B
It becomes.

Next, the operation of the present embodiment will be described.
As shown in FIG. 8, the brake switch 1 includes a casing 10 in which an anode terminal 20, a ground terminal 30, a movable terminal 40 and a coil spring 50 are incorporated. When incorporating them, the coil spring receiving portion 45 of the movable terminal 40 receives one end of the coil spring 50 and pushes it into the accommodating space 11 from the opening 14 of the casing 10 and accommodates it.

  Next, the anode terminal 20 and the ground terminal 30 are inserted into the casing 10 with the movable terminal 40 and the coil spring 50 pushed. As shown in FIG. 10, the anode contact portion 21 a of the anode terminal 20 inserted into the casing 10 and the ground contact portion 31 a of the ground terminal 30 are wider than the distal end portion 41 of the movable terminal 40. Since it is narrower than the end portion 42, it serves as a stopper that prevents the movable terminal 40 and the coil spring 50 from coming out of the opening 14 to the outside.

  FIG. 10 is an explanatory diagram illustrating a process in which the brake switch 1 is actuated when the brake lever operation is transmitted. (A) has shown the state which pulled the brake lever, ie, the state which the parking brake device is braking. In this state, the switch pad 100 is not in contact with the distal end portion 41 of the movable terminal 40 or the movable terminal 40 is not pushed into the casing 10, so that the movable terminal 40 protrudes most from the casing 10. At the same time that the contact portion 47 is in contact with the anode contact portion 21a, the ground terminal contact portion 48 is in contact with the ground contact portion 31a. In this state, the brake switch 1 is ON.

  (B) shows a state where the brake lever is completely returned, that is, a state where the braking of the parking brake device is released. Since the rotation center of the switch pad 100 is provided closer to the ground contact portion 31a, the switch pad 100 that contacts the arc-shaped portion of the tip portion 41 contacts the portion closer to the ground contact portion 31a. Therefore, the tip end portion 41 is inclined toward the anode contact portion 21a opposite to the ground contact portion 31a. For this reason, the side surface of the tip 41 of the movable terminal 40 is in contact with the anode contact portion 21a, and the counter-anode terminal contact portion 47 is not in contact with the anode contact portion 21a. Further, the ground terminal contact 48 is not in contact with the ground contact 31a.

  (C) shows an example of a halfway process from pulling the brake lever to the braking state (A) from the braking release state of (B). In this state, since the switch pad 100 is located farther from the brake switch 1 than in the state (B), the tip 41 protrudes more than in the state (B). For this reason, the counter-anode terminal contact portion 47 is in contact with the anode contact portion 21a, and at the same time, the counter-ground terminal contact portion 48 is in contact with the ground contact portion 31a. In this state, since the movable terminal 40 is still inclined toward the anode contact portion 21a, the anode contact portion 21a is in contact with a portion of the counter-anode terminal contact portion 47 close to the tip portion 41. On the other hand, the ground contact portion 31 a is in contact with a portion of the anti-ground terminal contact portion 48 that is far from the tip portion 41 and close to the leg portion 44.

  When the brake lever is further pulled from the state of (C), the state shown in (D) and (A) is obtained. That is, the anode contact portion 21 a is in contact with a portion near the center of the counter-anode terminal contact portion 47. The ground contact portion 31 a is in contact with a portion near the center of the ground terminal contact portion 48.

  Thus, in the stroke of the brake lever operation, the movable terminal 40 receives the brake lever operation from the switch pad 100 to which the brake lever operation is transmitted, reciprocates in the extending direction of the coil spring 50 and swings. As shown in FIG. 11, the movable terminal 40 swings with the ground contact portion 31a in contact with the ground contact portion 31a over a predetermined range of the shoulder portion 43b during the brake lever operation process, so that the ground terminal contact portion 48 is connected to the ground contact portion 31a. It is rubbed and wiped. Similarly, during the operation of the brake lever, the anode contact portion 21a swings over a predetermined range of the shoulder portion 43a, so that the counter-anode terminal contact portion 47 is rubbed and wiped by the anode contact portion 21a.

  Thus, the counter-anode terminal contact portion 47 is wiped by the anode contact portion 21a and the ground-contact terminal contact portion 48 is wiped by the ground contact portion 31a every time the brake lever is operated. In the part 48, even if copper oxide or the like is generated due to discharge at the time of switching, the copper oxide or the like is scraped immediately after the generation immediately before the copper oxide film or the like is formed. Thereby, the anti-anode terminal contact portion 47 and the anti-ground terminal contact portion 48 are maintained in good contact with the anode contact portion 21a and the ground contact portion 31a, thereby preventing the occurrence of poor conduction.

  Moreover, since the movable terminal 40 is accommodated in the casing 10, and the shoulder part 43a and the shoulder part 43b are in the casing 10, dust and dust are hard to adhere to them and it is excellent in dust resistance. Therefore, it is possible to prevent the occurrence of poor conduction due to adhesion of dust and dust.

  In addition, as shown in FIG. 12, the bending prevention piece 70 for preventing the bending of the coil spring 50 is attached to the coil spring receiving portion 45 so that the bending prevention piece 70 receives one end of the coil spring 50. May be. The illustrated anti-bending piece 70 has a small-diameter cylindrical portion on which the coil spring 50 is externally mounted and a large-diameter portion attached to the coil spring receiving portion 45. The outer diameter of the large-diameter portion is almost the same as the inner diameter of the coil spring housing portion 13 in which the coil spring 50 is housed in the housing space 11 and is slightly smaller.

  FIG. 13 and FIG. 14 illustrate different shapes of the movable terminal 40. The curved surfaces of the counter anode terminal contact portion 47 and the ground terminal contact portion 48 are formed as a part of a spherical surface or a part of a cylindrical circumferential surface. Further, the curved surface at the tip of the tip 41 is also formed as a part of a spherical surface or a part of a circumferential surface of a cylinder.

  The centers O of the spheres or cylinders that form the curved surfaces of the anode terminal contact portion 47 and the earth terminal contact portion 48 and the spheres or cylinders that form the curved surface at the tip of the tip portion 41 are concentric and have different radii. . The radius from the center O to the curved surface of the tip of the tip portion 41 is r1, and the radius from the center O to the curved surfaces of the counter anode terminal contact portion 47 and the ground terminal contact portion 48 is r2. Thereby, the variation of the stroke of the movable terminal 40 by the position and angle at which the switch pad 100 pushes the tip 41 of the movable terminal 40 can be almost eliminated.

  FIG. 15 shows an anode terminal 20 </ b> A having a shape different from that of the anode terminal 20, and the shape of the insertion portion is different from that of the anode terminal 20. The insertion portion 21 of the anode terminal 20 has a mounting hole 23 for the tapping screw 60. The anode terminal 20A has a notch 23A for mounting the tapping screw 60. Further, a locking portion 24 for locking and fixing to the casing 10A is formed. A locking groove 16 is formed on the side edge of the casing 10A to engage and lock the locking portion 24 of the anode terminal 20A.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and there are changes and additions within the scope not departing from the gist of the present invention. Are also included in the present invention. For example, the shape of the movable terminal 40 is not limited to that shown in FIG. 1 and the like and those shown in FIGS. 13 and 14, and may be changed as appropriate depending on the size and shape of the housing space 11 and the opening 14 of the casing 10. Also good.

  The brake switch according to the present invention is not limited to a switch used for detecting the braking state of the parking brake device, but can be widely used as a switch for detecting a mechanical operation and an operation state.

DESCRIPTION OF SYMBOLS 1 ... Brake switch 10 ... Casing 10A ... Casing 11 ... Housing space 12 ... Terminal mounting part 13 ... Coil spring accommodating part 14 ... Opening 15 ... Grounding terminal mounting part 16 ... Locking groove 20 ... Anode terminal 20A ... Anode terminal 21 ... Difference Insertion portion 21a ... Anode contact portion 22 ... Connection portion 23 ... Mounting hole 23A ... Notch portion 24 ... Locking portion 30 ... Earth terminal 31 ... Insertion portion 31a ... Earth contact portion 40 ... Moving terminal 41 ... Tip portion 42 ... Base End 43a ... Shoulder 43b ... Shoulder 44 ... Leg 45 ... Coil spring receiving part 47 ... An anode terminal contact 48 ... Anti earth terminal contact 50 ... Coil spring 60 ... Tapping screw 70 ... Bend prevention piece 100 ... Switch pad

Claims (4)

In the detection switch for detecting mechanical operation and operation state,
An anode terminal and a ground terminal assembled in the casing; and a conductive movable terminal housed in the casing and biased in a direction in which a tip protrudes outside the casing and supported in a swingable manner. Prepared,
The movable terminal receives transmission of mechanical motion at the tip, swings in the process of mechanical motion, contacts the anode terminal and the ground terminal so as to rub over a predetermined range, and the operating state is predetermined. When in a state, the detection switch is in contact with the anode terminal and the ground terminal. In the detection switch for detecting mechanical operation and operation state,
An anode terminal and a ground terminal assembled to the casing; an anode terminal contact portion that can contact the anode terminal over a predetermined range; and a ground terminal contact portion that can contact the earth terminal over a predetermined range; An electrically conductive movable terminal incorporated in the casing so that the portion side protrudes outside the casing, and urges the movable terminal in the direction in which the tip end side of the movable terminal protrudes outside in the casing. An urging member for swingably supporting,
The movable terminal receives transmission of mechanical motion at the distal end surface of the distal end portion, swings in the process of mechanical motion, and makes contact with the anode terminal contact portion so as to rub against the anode terminal. When the operation state is a predetermined state, a part of the contact point with the anode terminal contacts the anode terminal, and most of the contact point with the ground terminal rubs against the ground terminal. A detection switch characterized in that a part of a contact portion with respect to a ground terminal is in contact with the ground terminal. The anode contact portion where the anode terminal is in contact with the movable terminal and the ground contact portion where the ground terminal is in contact with the movable terminal are arranged at a predetermined interval in the casing,
The movable terminal has the distal end portion extending from between curved shoulder portions provided on both sides of a base end portion, and extends in a direction opposite to the extending direction of the distal end portion from each of the shoulder portions on both sides. A leg portion for limiting the amount of swing of the terminal, and a biasing member receiving portion that is provided between the leg portions and supported by a biasing force from the biasing member,
The distal end portion has the distal end surface formed in a curved shape,
The opposite anode terminal contact portion is formed on the shoulder portion closer to the anode terminal of the both shoulder portions, and the opposite ground terminal contact portion is formed on the shoulder portion closer to the ground terminal of the both shoulder portions. The detection switch according to claim 2, wherein the detection switch is provided.   The anti-anode terminal contact portion and the anti-ground terminal contact portion, and the curved surface of the tip surface of the tip portion are formed as a part of a spherical surface of a concentric sphere or a part of a circumferential surface of a concentric cylinder. The detection switch according to claim 2 or 3, characterized in that.