CN1211055A - Slope sensor - Google Patents

Abstract

The invention relates to a slantwise sensor which includes a box 11 composed of a base plate 11a and side plates 11b, 11c, 11d, 11e and having a box lid 16 mounted above the box, a movable joint 15 mounted in the box 11 and having a spherical appearance, a plate 11f for positioning the movable joint at an immobile position at a side of the box 11, fixed joint 13, 14 of a pair of joint units 13b, 14b mounted in the box 11 and having a diameter clearance less than that of the movabel joint 15, and a means mounted on the base plate 11a of the box 11 and moving the movable joint 15 from the immobile position to the pair of joint units 13b, 14b by an introduction unit 12.

Description

Inclination sensor

The present invention is used for small-sized switching device, is relevant inclination according to this device body, and makes the switch loop carry out the inclination sensor of conducting or disconnection.

According to Fig. 8 to Figure 10 existing apsacline transducer is described.

At first as Fig. 8 exploded perspective view, external mechanical for example is wrist-watch modules 1 such as (scheming not shown), be provided with a pair ofdistribution template 2 of separation in the middle, 2, in the separated part of thisdistribution template 2,2, by a pair of fixed contact 3,4 form fixed gap, separate on the opposite in opposite directions mutually, installs by soldering.

Above-mentioned a pair of fixed contact 3,4th constitutes and respectively by the contact terminal 3a of portion with the block parts made with metal material, 4a and mountingpart 3b, and 4b forms.

At above-mentioned contact terminal 3a as shown in Figure 8, among the 4a, formation is lower than the 3f of right side one end as shown, 4f, and be higher than the 3g of the left side other end as shown, theinclined plane 3c of 4g, 4c.

And at the above-mentioned contact terminal 3a of portion, the 4a place formsforward surface 3d, and 4d is with above-mentionedinclined plane 3c, 4c joins and forms corner angle portion respectively, and this corner angle portion carried out chamfering, be processed into the 3e of contact portion of pair of guide rails shape, 4e by grinding, this guiderail shape contact 3e of portion, 4e, form fixed gap, be nearly V word shape mutually in opposite directions.

This guiderail shape contact 3e of portion, 4e makes the film of its deposited lid layer good conductivity by gold-plated grade.In addition at the above-mentioned guiderail shape contact 3e of portion, the contact terminal 3a of portion outside the 4e, the surface of 4a forms one deck insulating properties film.

On above-mentioned module 1, be provided with profile and be approximaterectangular casing 5, around it byside plate 5a, 5b, 5c, 5d and forming, inside vertically is to connect opening, material is to be made by resin etc.With pack into the inside of thisopen casing 5 of above-mentioned a pair of fixed contact 3,4, and below above-mentionedcasing 5, be installed on the module 1 by binding agent.

In addition, as shown in figure 10, the right side as shown incasing 5 inside forms one by anend 3f of above-mentioned a pair of fixed contact 3,4, side'sside plate 5a of 4f andcasing 5, the spatial portion of holding under the arm mutually 6.

In thisspatial portion 6, be provided with a spherical movably travellingcontact 7 of making by steel ball, when above-mentionedcasing 5 is in level, thetravelling contact 7 in above-mentionedspatial portion 6, all removable to left and right direction as shown in Figure 9.

And the top of above-mentionedcasing 5, the loam cake that can cover thesecasing 5 tops that can be made by resin material constitutes by means such as binding agent or ultrasonic bonding.

From the action of the above-mentioned existing apsacline transducer that constitutes, when as shown in figure 10casing 5 was in level, then travellingcontact 7 can move in thespatial portion 6 in the above-mentionedcasing 5.

And as shown in figure 10 when theside plate 5c side in left side as shown with above-mentionedcasing 5, when the below of arrow A direction tilted, then travellingcontact 7 was just speeded to the above-mentioned pair of guiderails shape contact 3e of portion, 4e, and a pair of fixed contact 3,4 is electrically connected by travellingcontact 7.

And when travellingcontact 7 to the guiderail shape contact 3e of portion, 4e is last when mobile, its a pair of fixed contact 3,4 promptly is electrically connected.

Be used for when this existing apsacline transducer under the situation of wrist-watch (scheming not shown), be with above-mentioned a pair of fixed contact 3, anend 3f of 4, the 4f side, be in 12 o'clock directions of wrist-watch literal dish, or with theother end 3g of above-mentioned a pair of fixed contact 3,4, the 4g side is in 6 o'clock directions of wrist-watch literal dish, and promptly the apsacline transducer is to be contained in such a way on the module 1 of wrist-watch.

Above-mentioned inclination sensor is installed on the wrist-watch, and when wanting to confirm wrist-watch during the time, as long as it is oblique to be directed downwards square neck during with theliteral dish 6 of wrist-watch, then travellingcontact 7 is promptly speeded to the 3e of contact portion of above-mentioned pair of guide rails shape, 4e, and this contact portion is in thereupon and conducts.Like this, the light-emitting component that is equipped with in above-mentioned wrist-watch (scheming not shown) is luminous, and the literal dish is liquid crystal in this way, and then light-emitting component promptly as returning irradiation, even very dark on every side, also can be read from the literal dish.

In addition, be in common state that cannot see wrist-watch as the operator, because travellingcontact 7 is mobile unrestricted, therefore, the operator can make travellingcontact 7 turn round oncasing 5 internal freedom ground by free movable its wrist, make the 3e of contact portion of itself and pair of guide rails shape, during 4e and when contacting and break away from, the result causes above-mentioned light-emitting component luminous repeatedly continually, promptly causes waste.

In the normal state, for improving the frequent luminous wasting phenomenon of light-emitting component, in existing inclination sensor, as above-mentionedtravelling contact 7 is contacted the pair of guiderails shape contact 3e of portion, the time of 4e was taken as in 1/4 second, then above-mentioned light-emitting component just can be not luminous, and actual packing into the fluorescent lifetime control loop of forming as scheming the large scale integrated circuit that does not show, promptly the may command light-emitting component is not luminous continually.

When being used for existing inclination sensor on the wrist-watch, because wrist-watch freely moves, and makespherical travelling contact 7, with a 3e of docking point portion of fixedcontact 3,4,4e contacts continually, makes light-emitting component luminous repeatedly continually and cause waste.In order to prevent the luminous of this waste,, also correspondingly improved the manufacturing cost of existing inclination sensor owing to having packed the fluorescent lifetime control loop that large scale integrated circuit is formed into.

Above-mentionedtravelling contact 7 is in thespace 6 ofbox house 5, owing to can do to move freely at left and right directions as shown in Figure 9, therefore be in 5b with right plate when travellingcontact 7, or during the contacted position of the 5d that is in left plate, ascasing 5 is tilted to the direction of arrow A as shown in figure 10, then travellingcontact 7 promptly is in theinclined plane 3c that forms insulation film, on the 4c, the result make travelling contact can not with the 3e of a docking point portion, 4e is electrically connected, this also is the problem that exists.

To above-mentionedinclined plane 3c, the corner angle portion of 4c need carry out chamfering, and make a 3e of docking point portion, 4e become guide rail shape, the 3e of this contact portion, 4e need carry out gold-plated, because of other partly forms the insulating properties film, like this, just make fixed contact 3,4 manufacturing is complicated, and makes existing apsacline transducer cost higher.

In addition, said fixing contact 3,4, it is by the contact terminal 3a of portion, 4a and mountingpart 3b, 4b and forming, and the contact that is fixed is welded on thedistribution template 2,2 by soldering, cover from the top withcasing 5 then, becausecasing 5 is to utilize binding agent to be bonded on the module 1, not only increase part count but also increased installation work-hour again, directly reduced productivity.

Because above-mentionedcover plate 8 is to utilize binding agent or ultrasonic bonding etc., it is installed on thecasing 5 that makes with resin material, therefore binding agent can flow into the inside ofcasing 5, the welding of resin bits also can enter the inside ofcasing 5 under ultrasonic bonding, like this, the surface of travellingcontact 7 is promptly contaminated, and the 3e of contact portion of above-mentioned pair of guide rails shape, the surface of 4e is also contaminated.Certainly, in this state, the 3e of contact portion of travellingcontact 7 and guide rail shape, the electrical contact reliability between the 4e has reduced beyond doubt.

As the inclination sensor of the present invention that solves above-mentioned problem first means, adopt its structure by the casing that cover plate is housed above base plate and side plate are formed, by being equipped with removable at this box house and profile is spherical travelling contact, by the side in the casing that travelling contact is packed into, and the resting position that it is located temporarily, by other side in above-mentioned casing, establish fixed contact having above-mentioned gap with a docking point portion less than the travelling contact diameter dimension, and by on the base plate of above-mentioned casing, make above-mentioned travelling contact, mechanisms such as introduction part from above-mentioned resting position to an above-mentioned docking point portion guiding function form, when above-mentioned travelling contact when casing tilts, travelling contact promptly from above-mentioned resting position along above-mentioned introduction part, move to an above-mentioned docking point portion, contact with this docking point portion.

As the second means that solves above-mentioned problem, be make above-mentioned introduction part from the above-mentioned base plate to the box house projection, when above-mentioned travelling contact contacted with an above-mentioned docking point portion, above-mentioned travelling contact will be by an above-mentioned docking point portion and above-mentioned introduction part, and above-mentioned cover plate hinders, and limits it and moves.

As the 3rd means that solve above-mentioned problem, its structure be the end with above-mentioned introduction part be in above-mentioned module near, and the other end be between the fixed contact with above-mentioned docking point portion near.

As the 4th means that solve above-mentioned problem, its structure is to the height by above-mentioned introduction part base plate institute projection, need make above-mentioned another distolateral height than above-mentioned one distolateral height height, and with the surface of above-mentioned introduction part make decide the inclination of angle.

As the 5th means that solve above-mentioned problem, its structure is the above-mentioned docking point portion with flat condition, along the longitudinal extension of above-mentioned other side plate of casing, the surface of this docking point portion and the outer peripheral face of above-mentioned travelling contact join, and form approximate splayed in opposite directions mutually.

As the 6th means that solve above-mentioned problem, its structure is when above-mentioned travelling contact is on the above-mentioned module, it is to locate by the inner face of side's side plate of an end of above-mentioned introduction part and above-mentioned base plate and above-mentioned casing temporarily, when the below with other plate angle that side direction is decided of above-mentioned casing tilts, then above-mentioned travelling contact, speed to above-mentioned introduction part one end time from above-mentioned module, and move to the contact portion of above-mentioned a pair of fixed contact by the guiding on this introduction part surface.

The present invention is described in detail below in conjunction with accompanying drawing.

Fig. 1 is the exploded view of inclination sensor of the present invention;

Fig. 2 is the stereogram of inclination sensor of the present invention;

Fig. 3 is the main cross sections figure of inclination sensor of the present invention;

Fig. 4 is the top figure of inclination sensor of the present invention;

Fig. 5 is the main cross sections figure of explanation inclination sensor action of the present invention;

Fig. 6 is the main cross sections figure of explanation inclination sensor action of the present invention;

Fig. 7 is the top figure of explanation inclination sensor action of the present invention;

Fig. 8 is the exploded view of existing inclination sensor;

Fig. 9 is the top figure of existing inclination sensor;

Figure 10 is the main cross sections figure of existing inclination sensor.

Apsacline transducer of the present invention, its construction profile are thecasings 11 that approximate rectangle is formed by resin material, and it is by base plate 11a and the side plate 11b around being located at, 11c, and 11d, 11e constitutes, and its inside is that hollow and top are in opening-wide state.

And for example shown in Fig. 4 top, inner face at side's side plate 11d, form the circular-arc of nearly semicircle, intersect partly at the inner face of this side plate 11d and the inner face of base plate 11a, formation circular-arc shown in Fig. 3 main cross sections figure, and this partly will be as the module 11f ofaftermentioned travelling contact 15 side resting position incasing 11.

In addition, in the inside ofcasing 11, promptly be provided with jut in the nearly centre position apart from above-mentioned base plate 11a inner face, formation has institute's take the altitude and length, and has theintroduction part 12 of anend 12a andother end 12b.

By side plate 11b around thecasing 11,11c, 11d, 11e form respectively four angles above,circular installation bolt 11g is housed, make it by institute's take the altitude projection.

On the base plate 11a of above-mentionedcasing 11 other sides, to have by a 13b of docking point portion who forms flat condition less than the metallic plate in aftermentioned travellingcontact 15 diameter dimension gaps, the fixedcontact 13,14 of 14b, be contained on the base plate 11a of thecasing 11 that is embedded into shaping, and it is become one.

On the above-mentioned base plate 11a by the integration fixedcontact 13,14 that embed to be shaped on, the 13a of its terminal portion, 14a is from as shown in Figure 4left side plate 11c, 11e is outwards outstanding to be connected.

The 13a of this terminal portion, 14a can utilize soldering that it is welded on the module (scheming not shown) of wrist-watch.

And said fixingcontact 13,14 incasing 11 inside as shown in Figure 3, extends to as shown right oblique upper from base plate 11a, and with a 13b of docking point portion of extension flat condition, 14b is along vertically extending of above-mentionedcasing 11 other side plate 11b.

In addition, an above-mentioned 13b of docking point portion, the flat condition surface of 14b contacts its outer peripheral face withaftermentioned travelling contact 15, thus form have mutually decide the approximate splay structure in opposite directions of angle.

End 12a in the above-mentionedintroduction part 12, be in above-mentioned resting position 11f near, andother end 12b is in the above-mentioned 13b of docking point portion that has, near the position between a pair of fixedcontact 13,14 of 14b.

And to the projecting height of above-mentionedintroduction part 12 on base plate 11a, make the height of the height of above-mentionedother end 12b side greater than an above-mentionedend 12a side, and with the surface of above-mentionedintroduction part 12 make decide the gradient of angle.The angle of inclination on theseintroduction part 12 surfaces, when as shown in Figure 3casing 11 is under the level, its angle can be taken as about 10 °～20 °.

In addition, above-mentioned a pair of fixedcontact 13,14 is packed into the method forcasing 11, be configured as the method for one except that adopting to embed, also can take another kind of method, tabular fixed contact directly can be inserted among other side plate 11b ofcasing 11, fixed contact be carried out bending at box house.This mode though it is many to be shaped than above-mentioned embedding during its assembler, is made the shaping forging die ofcasing 11 and is compared with embedding shaping forging die, and it is simple in structure, the forging die expense also can reduce.

Base plate 11a inner face incasing 11 is hollow is loaded into by thespherical travelling contact 15 with conductivity steel ball, and this travellingcontact 15,, can move along the surface of above-mentionedintroduction part 12 between the 14b to the above-mentionedcontact 13b of portion from above-mentioned resting position 11f.

When above-mentionedtravelling contact 15, whencasing 11 was in as shown in Figure 3 level, then the some on travellingcontact 15 surfaces contacted with anend 12a ofintroduction part 12, is in resting position 11f and locatees temporarily.

Then, on the top of packing travellingcontact 15casings 11 into, add and cover the cover plate made frommetallic plate 16, the hollow interior of coming closedbox 11 by this cover plate.

On four angles of thiscover plate 16, form installinghole 16a respectively, in this installinghole 16a,insert casing 11 respectivelybolt 11g is installed, to from above-mentioned installinghole16a installation bolt 11g protruding upward, seal pressure by riveted joint, itscover plate 16 is contained on thecasing 11 securely, can prevents that dust from enteringcasing 11 inside.

Like this,, need not use binding agent or ultrasonic bonding certainly,, get final product the inside of closedbox 11 as long as theinstallation bolt 11g of four points is riveted simultaneously sincecover plate 16 is to utilize the metal manufacturing.Therefore, install easily, and can prevent from the welding bits that produce when the installation method of adopting over is ultrasonic bonding from can make an above-mentioned 13b of docking point portion simultaneously, between 14b and thetravelling contact 15, obtain stable high-quality and contact.

By Fig. 3 and Fig. 5 to Fig. 7, the action of above-mentioned formation apsacline transducer of the present invention is described.At first see thecasing 11 of level, as shown in Figure 3, travellingcontact 15 is to be in resting position 11f, locatees on this position temporarily.

See as shown in Figure 5 from this state, when other side plate 11b of above-mentionedcasing 11 side, to the lower side (direction of arrow B) of deciding angle [alpha] (about 40 °) when tilting, then travellingcontact 15 is speeded to anend 12a ofintroduction part 12 from resting position 11f, the guiding on the surface byintroduction part 12, and shift to a 13b of docking point portion, 14b side.

As an above-mentionedtravelling contact 15 and a 13b of docking point portion, when 14b contacted, then travellingcontact 15 was subjected to thisdocking point 13b of portion, 14b, with the surface of above-mentionedintroduction part 12, and the restriction of above-mentionedcover plate 16, make above-mentioned a pair of fixedcontact 13,14, be electrically connected by travellingcontact 15.

When wanting to accelerate above-mentionedtravelling contact 15 mobile, the base plate 11a that needs onlycasing 11 tilts to nearly plumbness continuously as shown in Figure 6, then travellingcontact 15 can be from resting position 11f in moment, move to a 13b of docking point portion, the position of 14b, and can make a pair of fixedcontact 13,14 realize being electrically connected.

When apsacline transducer of the present invention with above-mentioned action, for example be used under the situation of wrist-watch (scheming not shown), then making above-mentionedtravelling contact 15 is from being in the resting position 11f side of interim location, become the direction when being in wrist-watchliteral dish 12, or from being in an above-mentioned 13b of docking point portion, 14b side, become the position of direction when being in wrist-watchliteral dish 6, andcasing 11 is contained on the module of wrist-watch (scheming not shown), and the above-mentionedterminal 13a of portion, 14a installs by soldering.

When wanting to confirm the moment of above-mentioned wrist-watch, the operator is as long as tilt above-mentioned wrist-watch to the direction of arrow B as shown in Figure 5, then travellingcontact 15 is promptly speeded to anend 12a of above-mentionedintroduction part 12, and move to a 13b of docking point portion along the surface ofintroduction part 12,14b, and fixedcontact 13,14 conducts by means of travellingcontact 15.

Like this, the light-emitting component in the above-mentioned wrist-watch of packing into luminous (scheming not shown), for example wrist-watch is to show with liquid crystal, then above-mentioned light-emitting component promptly becomes the back light lamp, though be to be in dark environment on every side, by the literal dish that crystal forms, also can read at an easy rate.

In addition, do not see as the operator under the common state of table, above-mentioned travellingcontact 15 is the positions that are in resting position 11f, operator's freely mobile wrist how no matter, because of above-mentioned travellingcontact 15 by the inner face of anend 12a of above-mentionedintroduction part 12 and above-mentionedcasing 11 1 sides' side plate 11d, and the interim location of above-mentioned base plate institute, so travellingcontact 15 is difficult to a 13b of docking point portion, the 14b side moves, thereby can prevent that above-mentioned light-emitting component not shown in the figures is luminous continually.

In above-mentioned enforcement state description,,, also can plate layer of conductive material in the periphery of spherical resin material though travellingcontact 15 is illustrated by steel ball.

When casing tilts, the travelling contact of apsacline transducer of the present invention, promptly move to an above-mentioned docking point portion from above-mentioned resting position along above-mentioned introduction part, cause and this docking point portion contact, an above-mentioned travelling contact and a docking point portion are each other, will inevitably realize veritably being electrically connected, thereby can obtain high-precision inclination sensor.

When the situation that inclination sensor of the present invention is used for wrist-watch, do not see the operator under the common state of table, even the freely mobile wrist of operator, travelling contact can not contact with a pair of fixed contact continually yet, therefore light-emitting component can luminously simply as before not cause waste, nor need a kind of fluorescent lifetime control loop with the time before light-emitting component luminous, lagged 1/4 second, thereby can reduce the cost of inclination sensor.

Above-mentioned introduction part is to form projection from above-mentioned base plate to box house, when above-mentioned travelling contact contacts with an above-mentioned docking point portion, moving then because of above-mentioned travelling contact, be subjected to the restriction of an above-mentioned docking point portion and above-mentioned introduction part and above-mentioned cover plate, therefore, although the casing of heeling condition is applied with vibration (for example with the operator's of wrist-watch wrist, vibration because of cold hand of shaking), its travelling contact also is difficult to be separated with a docking point portion, thereby can obtain high-precision inclination sensor.

When travelling contact contacts with a docking point portion, because it moves the restriction that is subjected to cover plate and above-mentioned introduction part, therefore can not produce the mobile of waste with some contact of above-mentioned contact portion, thereby reduce the wearing and tearing on above-mentioned travelling contact surface, can obtain long-life inclination sensor.

Be near the position of above-mentioned resting position because of an end of above-mentioned introduction part, and the other end is near the position between the fixed contact that is provided with above-mentioned contact portion, so travelling contact when being in above-mentioned resting position, one end of the introduction part that it protrudes is to join with the some of travelling contact periphery, it moves and is restricted, although thereby casing carries out freely moving, travelling contact can not jumped out from resting position yet.

The height of above-mentioned introduction part projection on base plate, accomplish that above-mentioned another distolateral aspect ratio above-mentioned one distolateral height wants high, and with the surface of above-mentioned introduction part form decide the inclination of angle, therefore under the state that casing moves freely, even travelling contact is jumped out and is speeded to the surface of introduction part from resting position, because the inclination on above-mentioned introduction part surface, travelling contact also will be limited to shift to a docking point portion side.

Therefore, although casing freely moves, can prevent that also travelling contact from contacting with a docking point portion continually.

An above-mentioned docking point portion of flat condition, cause is vertically extending along above-mentioned other side plate of casing, and the surface of this docking point is that the outer peripheral face with above-mentioned travelling contact joins, mutually form have decide the approximate splay structure in opposite directions of angle, therefore above-mentioned travelling contact is to be in the state of being seized on both sides by the arms by above-mentioned nearly splay contact portion, even at this moment casing is applied with vibration, travelling contact is also difficult to break away from a docking point portion, thereby can obtain high-precision inclination sensor.

Above-mentioned fixed contact with a docking point portion can be as a whole with casing embedding shaping, therefore can realize the inclination sensor of assembling easily.

When above-mentioned travelling contact is in above-mentioned resting position, it is to be located by the inner face of an end of above-mentioned introduction part and above-mentioned base plate and above-mentioned casing one side's side plate temporarily, when travelling contact tilts its below to deciding angle, then travelling contact is promptly speeded to an end of above-mentioned introduction part from above-mentioned resting position, moves to the contact portion of above-mentioned a pair of fixing point simultaneously by the surface of this introduction part.Therefore, even casing freely moves, travelling contact is owing to locate in resting position temporarily, and it moves and is restricted, thereby can realize that travelling contact can not jump out from resting position, and can prevent that travelling contact from contacting continually with a docking point portion.

When being used on the wrist-watch as inclination sensor of the present invention, its light-emitting component then can be frequently not luminous as before, causes waste, do not need the luminous preceding time of light-emitting component yet, the fluorescent lifetime control loop that lagged 1/4 second, thus inclination sensor cheaply can be obtained.

Claims (6)

1. inclination sensor, it is characterized in that, by the casing that cover plate is housed above forming at base plate and side plate, by in this casing, being equipped with removable and profile is spherical travelling contact, by the side in the casing that travelling contact is packed into, and the resting position that it is located temporarily, by other side in above-mentioned casing, establish fixed contact having with a docking point portion less than the gap of above-mentioned travelling contact diameter dimension, and by on the base plate of above-mentioned casing, make above-mentioned travelling contact, mechanisms such as introduction part from above-mentioned resting position to an above-mentioned docking point portion guiding function form, when above-mentioned travelling contact when casing tilts, promptly from above-mentioned resting position along above-mentioned introduction part, move to an above-mentioned docking point portion, it is contacted with this contact portion.

2. according to the described inclination sensor of claim 1, it is characterized in that, above-mentioned introduction part forms jut on the above-mentioned base plate of box house, when above-mentioned travelling contact contacts with an above-mentioned docking point portion, then moving of travelling contact promptly is subjected to the restriction of an above-mentioned docking point portion, above-mentioned introduction part and above-mentioned lid.

3. according to claim 1 or 2 described inclination sensors, it is characterized in that an end of above-mentioned introduction part is positioned near the above-mentioned resting position, and the other end be located between the above-mentioned fixed contact that a docking point portion arranged near.

4. according to claim 1,2 or 3 described inclination sensors, it is characterized in that above-mentioned introduction part is that the height of the above-mentioned end of aspect ratio of the above-mentioned other end wants high from the height of base plate upper process, thereby makes the surface angle tilt in accordance with regulations of above-mentioned introduction part.

5. according to claim 1,2 or 3 described transducers, it is characterized in that, above-mentioned docking point portion with flat condition, vertical formation along other side plate of above-mentioned casing is extended, make the surface of this docking point portion, join with the outer peripheral face of above-mentioned travelling contact, and mutually form and have institute and decide the position in opposite directions that angle is similar to Eight characters shape.

6. according to claim 1,2,3,4 or 5 described inclination sensors, it is characterized in that, when above-mentioned travelling contact is in above-mentioned resting position, its travelling contact is to locate by the inner face of side's side plate of an end of above-mentioned introduction part and above-mentioned base plate and above-mentioned casing temporarily, and when the below of the angle that other side direction is decided of above-mentioned casing tilts, then above-mentioned travelling contact is promptly speeded to an end of above-mentioned introduction part from above-mentioned resting position, import the surface of this introduction part simultaneously, and move to the contact portion of a pair of fixed contact.

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