阅读说明：本技术 包括断开触点锁定位置的常闭型微型电开关 (Normally closed miniature electrical switch including open contact locking position ) 是由 P·高蒂埃 F·瓦尔切 J·马约特 于 2020-10-21 设计创作，主要内容包括：本发明的目的是一种常闭型电开关(100),所述常闭型电开关(100)包括：壳体,所述壳体包括支撑固定的接触轨道(51)的下部部件；内部接触叶片(16,72,74,78),所述内部接触叶片(16,72,74,78)可弹性地变形以便呈现为了建立电开关通路的底部休止位置、其中所述开关轨道被中断的第一高非稳定位置、以及第二高稳定位置,其中所述电开关轨道被中断并且所述内部接触叶片(16,72,74,78)由可缩回的锁定装置(46,86)锁定；以及控制所述内部接触叶片(16)的变形的致动器(18,80,82)。(The object of the invention is a normally closed electrical switch (100), said normally closed electrical switch (100) comprising: a housing comprising a lower part supporting a fixed contact rail (51); an inner contact blade (16, 72, 74, 78), said inner contact blade (16, 72, 74, 78) being elastically deformable so as to assume a bottom rest position for establishing an electrical switching path, a first high unstable position in which the switching track is interrupted, and a second high stable position in which the electrical switching track is interrupted and the inner contact blade (16, 72, 74, 78) is locked by a retractable locking means (46, 86); and an actuator (18, 80, 82) controlling deformation of the inner contact blade (16).)

1. A normally closed electrical switch (100) comprising:

-a housing (10), said housing (10) comprising an upper part (12) made of insulating material and a complementary lower part (14) supporting a fixed lower inner contact track;

-an internal contact blade (16), said internal contact blade (16) being supported by said upper component (12) and being elastically deformable so as to assume:

-a bottom rest position (NC) in which the inner contact blade (16) elastically abuts downwards on a fixed lower inner contact track (51) so as to establish an electric switching path;

-a first high unstable position (NOi), in which the electrical switching path is interrupted; and

-a second high stable position (NOs) in which the electrical switch path is interrupted and the internal contact blade (16) is locked by retractable locking means (46, 86);

-an actuator (18) controlling the deformation of the inner contact blade (16), said actuator being pivotably mounted about a horizontal axis (a) from a rest position in which the inner contact blade is in its bottom rest position and towards which it is elastically returned, between:

-a first angular actuation position, in which the inner contact blade (16) is in its first high unstable position; and

-a second angular actuation position, in which the inner contact blade (16) is in its second high stable position.

2. The electrical switch (100) according to claim 1, characterized in that the rest position of the actuator (18) is an intermediate angular position between its first and second angular positions for activating the inner contact blade (16).

3. The electric switch (100) according to one of claims 1 and 2, characterized in that the internal contact blade (16) comprises in sequence:

-a rear section (70) for fixing the inner contact blade (16) to an upper part (12) of the casing (10);

-an intermediate actuation section (72); and

-a front contact section (74, 78), in a bottom rest position (NC) of the inner contact blade (16), the front contact section (74, 78) elastically abutting downwards on the fixed lower inner contact track (51) in order to establish the electrical switching path,

and the actuator (18) comprises a control cam (88), a cam profile (92, 94, 96) of the control cam (88) engaging with the intermediate actuating section (72) of the inner contact blade (16).

4. The electrical switch (100) according to claim 3, characterized in that the elastically deformable inner contact blade (16) engages with a control cam (88) of the actuator (18) to assist the elastic return of the actuator (18) towards its rest position.

5. The electrical switch (100) according to one of claims 3 and 4, characterized in that the intermediate actuating section (72) of the inner contact blade (16) extends substantially horizontally above the control cam (88) and above a pivot axis (A) of the actuator (18).

6. The electrical switch (100) according to claim 5, characterized in that the pivot axis (A) of the actuator (18) is located inside the housing (10).

7. The electrical switch (100) according to any of the preceding claims, characterized in that the upper part (12) of the housing comprises a locking notch (46) and the actuator (18) comprises a locking lug (86), the locking lug (86) engaging with the locking notch (46) in order to lock the inner contact blade (16) in its second high stable position (NOs).

8. The electrical switch (100) according to any of claims 1 to 6, characterized in that the lower part (14) of the housing comprises a locking notch (46) and the actuator (18) comprises a locking lug (86), the locking lug (86) engaging with the locking notch (46) to lock the inner contact blade (16) in its second high stable position (NOs).

9. An electric switch according to any of the preceding claims, characterized in that the electric switch comprises an internal stabilizing blade for stabilizing the actuator (18), the internal stabilizing blade comprising a stabilizing section (72'),

and the actuator (18) comprises a control cam (88 '), a cam profile (92') of the control cam (88 ') engaging with the stabilising section (72') of the inner stabilising blade.

10. Electrical switch (100) according to any of the preceding claims, characterized in that the lower part (14) of the housing (10) comprises a horizontal lower plate (50) for closing the housing (10), and in that the fixed lower inner contact track is part of the upper surface (51) of this lower plate (50).

11. The electrical switch (100) according to claim 9, characterized in that the lower plate (50) of the lower part (14) of the housing (10) comprises an elastically deformable branch (62), the elastically deformable branch (62) engaging a facing complementary portion (96) of the actuator (18) to assist the elastic return of the actuator (18) from its first angular actuation position to its rest position.

12. The electrical switch (100) according to claim 9 in combination with claim 8, characterized in that the lower plate (50) of the lower part (14) of the housing (10) comprises an elastically deformable tab (99), the tab (99) comprising the locking notch (46).

13. The electrical switch (100) according to any of the preceding claims, characterized in that the actuator (18) comprises an arm (82) for pivoting the actuator (18) in both directions, which arm projects vertically upwards through the upper part (12) of the housing (10).

14. The electrical switch (100) according to any of the preceding claims, characterized in that the second high stable position (NOs) of the inner contact blade (16) corresponds to an initial delivery state of the electrical switch (100).

15. An assembly (200) comprising an electronic board (102) and an electric switch according to any of the preceding claims, characterized in that the electric switch (100) is mounted on a surface (104) of the electronic board and adjacent to an edge (106) of the electronic board (102) such that, if the assembly (200) is placed in an electronic device, an internal contact blade (16) of the electric switch is automatically unlocked due to its actuator contacting a facing part of the electronic device or a part belonging to an assembly means.

Technical Field

The present invention relates to a normally closed electrical switch comprising a resiliently deformable blade causing the electrical switch to change state in response to an actuation force applied to the resiliently deformable blade, and wherein the electrical switch is held in a closed state in the absence of an applied actuation force.

Background

In this type of electric switch, the electric switch is held elastically in its closed state under load in the absence of a force acting on the actuator.

After integration of this type of electric switch in an electronic or electromechanical device, its conventional use consists in interrupting the passage of the electric switch by acting on its actuator before the first use or the start of operation of the device. The device can then be stored for potentially very long periods of time without consuming energy.

During at least one first change of state of the electric switch caused by the first use, the switch assumes its closed state at least temporarily, in which closed state an electric switch path is established.

Such a design can be cumbersome, particularly when the electrical switch is assembled on an electronic board that includes a battery pack or cells. In fact, before being integrated in the electronic device, the electric switch is not activated and is in its closed state, which results in consuming the energy stored in the battery pack or battery of the device.

The object of the present invention is to propose a solution to this problem by proposing an electric switch comprising means for locking in the open position, i.e. in a state in which the passage of the electric switch is interrupted.

Another object of the invention is to propose such an electric switch which has a compact design and allows absorbing actuation overtravel.

It is also an object of the invention to propose a switch that can be unlocked automatically when it is supported by a sub-assembly mounted and assembled in an electronic device.

Disclosure of Invention

The invention provides a normally closed switch, comprising:

-a housing comprising an upper part made of insulating material and a complementary lower part supporting a fixed lower inner contact track;

-an internal contact blade supported by the upper part and elastically deformable so as to assume:

a bottom rest position, in which the inner contact blade elastically abuts downwards against a fixed lower inner contact track, so as to establish an electric switching path;

a first high unstable position, wherein the electrical switching path is interrupted; and

a second high stable position, wherein the electrical switch path is interrupted and the internal contact blade is locked by a retractable locking means;

-an actuator controlling the deformation of the inner contact blade, the actuator being pivotally mounted about a horizontal axis from a rest position in which the inner contact blade is in its bottom rest position and towards which the actuator resiliently returns, between:

a first angular actuated position, wherein the inner contact blade is in its first high unstable position; and

a second angular actuation position, wherein the inner contact blade is in its second high stable position.

According to other features of the invention:

the rest position of the actuator is an intermediate angular position between its first and second angular positions for activating the inner contact blades;

-said internal contact blades comprise in sequence:

-a rear section for fixing the inner contact blades to the upper part of the housing;

-an intermediate actuation section; and

-a front contact section, which in a bottom rest position of the inner contact blade elastically abuts downwards on the fixed lower inner contact track in order to establish the electrical switch path, and the actuator comprises a control cam, the cam profile of which engages with an intermediate actuation section of the inner contact blade;

-the elastically deformable inner contact blades engage with a control cam of the actuator to assist the elastic return of the actuator towards its rest position;

-the intermediate actuation section of the inner contact blade extends substantially horizontally above the control cam and above a pivot axis of the actuator;

-the pivot axis of the actuator is located inside the housing;

-the upper part of the housing comprises a locking notch and the actuator comprises a locking lug which engages with the locking notch in order to lock the inner contact blade in its second high stable position;

-as an alternative embodiment, the lower part of the housing comprises a locking notch and the actuator comprises a locking lug which engages with the locking notch to lock the inner contact blade in its second high stable position;

-the electric switch comprises an internal stabilizing blade for stabilizing the actuator, the internal stabilizing blade comprising a stabilizing section, the actuator comprising a control cam, a cam profile of which engages with the stabilizing section of the internal stabilizing blade;

the lower part of the casing comprises a horizontal lower plate for closing the casing and the fixed lower inner contact track is part of the upper surface of this lower plate;

-the lower plate of the lower part of the casing comprises elastically deformable branches which engage with facing complementary portions of the actuator to assist the elastic return of the actuator from its first angular actuation position to its rest position;

as an alternative embodiment, the lower plate of the lower part of the casing comprises an elastically deformable tab comprising a locking notch;

-the actuator comprises an arm for pivoting the actuator in two directions, the arm projecting vertically upwards through the upper part of the housing;

-the second high stable position of the inner contact blade corresponds to an initial delivery state of the electrical switch.

The invention also proposes an assembly comprising an electronic board and a switch according to the invention, characterized in that the electric switch is mounted on a surface of the electronic board and adjacent to an edge of the electronic board so that, if the assembly is placed in an electronic device, the internal contact blades of the electric switch are automatically unlocked as a result of their actuators contacting facing parts of the electronic device or parts belonging to an assembly device.

Drawings

Further features and advantages of the invention will become apparent from a reading of the following detailed description, which is to be read with reference to the accompanying drawings, in which:

figure 1 is a perspective view of a first embodiment of an electrical switch according to the present invention;

figure 2 is a side view of the electrical switch shown in figure 1;

figure 3 is a top view of the electrical switch shown in figure 1;

figure 4 is a bottom view of the electrical switch shown in figure 1;

FIG. 5 is an exploded perspective view of the components of the electrical switch shown in FIG. 1;

FIG. 6 is a perspective view at another angle similar to the view of FIG. 5;

FIG. 7 is a view similar to the view of FIG. 1, with the upper components of the housing and the actuator not shown;

figure 8 is a perspective bottom and partial cross-sectional view of the electrical switch shown in figure 1 with the upper part of the housing not shown;

FIG. 9 is a view of the electrical switch of FIG. 1, the view being shown as a cross-sectional view along line 9-9 of FIG. 3;

FIG. 10 is a view of the electrical switch of FIG. 1, the view being shown as a cross-sectional view along line 10-10 of FIG. 3;

figure 11 is an enlarged perspective view of an actuator of the electrical switch shown in figures 1 to 10;

figure 12 is a view similar to the view of figure 6 showing a second embodiment of an electrical switch in accordance with the present invention;

FIG. 13 is a view similar to that of FIG. 7 and showing the second embodiment shown in FIG. 12;

FIG. 14 is a view similar to that of FIG. 8 and showing the second embodiment shown in FIG. 12;

figure 15 is an enlarged perspective view of an actuator of the electrical switch shown in figures 12 to 14;

figure 16 is a view similar to that of figure 9 and showing a second embodiment of the electrical switch in a normally closed state;

figure 17 is a view similar to the view of figure 16 showing the electrical switch in an open, non-stable state;

figure 18 is a view similar to that of figure 16 showing the electrical switch locked in the open stable state;

figure 19 is a view similar to that of figure 10 and showing a second embodiment of the electrical switch in a normally closed state;

figure 20 is a view similar to that of figure 19 and showing the electrical switch in an open, non-stable state;

figure 21 is a view similar to that of figure 19 and showing the electrical switch locked in the open stable state;

figure 22 is a perspective view showing the electrical switch shown in figures 12 to 21 in a position assembled on a surface of a printed circuit board or panel; and

fig. 23 is a side view of the assembly shown in fig. 22.

Detailed Description

For the purposes of the description of the invention and for the purposes of understanding the claims, the V, L, T coordinate system shown in the drawings will be employed in vertical, longitudinal, and transverse orientations with the longitudinal axis L and the transverse axis T extending in a horizontal plane, by way of non-limiting example and without limitation with reference to ground gravity.

Conventionally, the longitudinal axis L is oriented from rear to front.

In the following description, the same reference numerals will be used to refer to the same, similar or comparable elements.

First embodiment with two internal contact blades

Figures 1 to 5 illustrate an embodiment of an electrical switch 100, which electrical switch 100 in this example has an overall design symmetry with respect to a vertical, mid-longitudinal plane PVM as shown in figure 3.

The electrical switch 100 includes a two-part housing 10 made of an upper part 12 and a lower part 14, the housing 10 housing a dual internal contact blade 16 and an actuator 18.

The upper component 12 is a component moulded from an insulating plastics material, having a generally rectangular parallelepiped shape and defining an internal housing 20, the internal housing 20 being bounded by a horizontal upper wall 22, two vertical and longitudinal side walls 24 and a front vertical and transverse wall 26.

The rear transverse surface 28 is open and the horizontal lower surface 30 is also open.

The upper wall 22 includes a central through hole 32, which central through hole 32 is delimited by an inclined front transverse edge 34, an inclined rear transverse edge 36 and two longitudinal vertical surfaces 38 having a longitudinal orientation.

In this example, the inner surface 23 of the upper wall 22 comprises two vertical studs 40 for thermocompression-bonding fixing the internal contact blades 16, said studs being arranged longitudinally in the vicinity of the open rear transverse surface 28.

The open lower surface 30 comprises three vertical studs 42 for thermocompression bonding the lower component 14, which are arranged in a triangular shape.

Approximately at mid-length, each side wall 24 includes a concave semi-cylindrical shell 44 that opens vertically downward.

Laterally, on either side of the central opening 32 and approximately at the middle length, the upper wall 22 includes a locking lug 46 having a generally V-shaped profile.

The locking lugs 46 are slightly offset longitudinally toward the front relative to the central axis a of the housing 44 (see fig. 10).

In this example, the lower part 14 of the housing 10 is a part made of a conductive metal plate, which is produced by cutting and folding.

The lower component comprises a horizontal rectangular lower plate 50, said lower plate 50 extending laterally bounded by two vertical, longitudinal side panels 52.

The dimensions of the lower component 14 match those of the upper component, such that in the assembled position the side panels 52 each extend along the outer surface 25 of the side walls 24 and extend substantially the entire height of the upper component 12.

Each side panel extends at its rear longitudinal end 54 bounded by an electrical connection tab 56, said electrical connection tab 56 extending outwardly in a vertical transverse plane.

To close the housing 10, the horizontal lower plate 50 comprises three holes 60 arranged in a triangle, each of which is passed vertically by a vertical stud 42 of the upper part 12.

After the assembly and thermocompression bonding fixation are completed, the periphery of the upper surface 51 of the lower plate 50 abuts against the facing portion of the lower surface 30 of the upper member.

The horizontal lower plate 50 comprises two elastic return branches 62.

Each return limb 62 is produced by cutting and folding and its front free end active section 64 is folded towards the inside of the inner casing of the upper part 12 of the casing 10.

By design, each return limb 62 is able to deform elastically, in particular downwards. In fig. 1-10, the elastic return limbs 62 are shown in their inelastically constrained state.

In this example, the internal contact blades 16 are double blades of symmetrical design with respect to the PVM plane, produced from a sheet of conductive metal by cutting and folding.

The two inner electrical contact blades are themselves connected together by a horizontal fixed beam 66.

In order to fix each internal electrical contact blade, the beam 66 comprises two holes 68, said two holes 68 being laterally spaced apart and each hole 68 being vertically crossed by the vertical post 40 of the upper member 12.

Each internal contact blade 16 comprises, longitudinally from rear to front, in turn, a rear fixed section 70, an intermediate actuating section 72 and a front contact section 74.

In this example, the rear fixing section 70 extends horizontally, and the beam 66 is fixed to the rear fixing section 70 so as to be fixed below the lower surface 23 of the upper wall 22 of the upper part 12 of the casing 10.

In this example, each rear securing section 70 extends longitudinally rearwardly through an external electrical connection section 76, which external electrical connection section 76 is shaped in this example as a pointed pin that projects longitudinally beyond the open rear transverse surface 28.

At rest, i.e. without any effect of the actuator 18 on the internal contact blades 16, each intermediate actuation section 72 extends horizontally inside the casing 20, approximately at an intermediate height, in the extension of the sections 70 and 76 (see fig. 9 and 10).

Each actuating section 72 is defined by a flat lower surface 73.

Each intermediate actuation section 72 extends forwardly from its front longitudinal end against a contact section 74, the front contact section 74 being vertically downwardly inclined and terminating at an angled end 78, the convex surface of the angled end 78 being oriented towards the inner upper surface 51 of the horizontal lower plate 50.

At rest, i.e. without any effect of the actuator 18 on the inner contact blade 16, each front contact section 74 is shaped so that its angled free end 78 is in downward resilient contact against a facing portion of the upper surface 51 of the lower plate 50.

The upper surface 51 of the lower plate 50 forms a fixed lower electrical contact track for establishing an electrical switching path between the lower plate 50 and its electrical connection tab 56 on the one hand and the pointed connection section 76 on the other hand.

This "at rest" state of the inner contact blade 16, and thus of the electrical switch 100, corresponds to the normally closed NC state of the switch.

Its actuation and therefore its change of state is intended to interrupt the established electrical switching paths by lifting the angled free ends 78 vertically upwards so that they no longer contact the facing portions of the upper surface 51 of the lower plate 50.

This upward movement is obtained by elastically deforming the inner contact blades 16 acting on the intermediate actuating section 72.

Such actuation and changing of state to the off state is achieved by the actuator 18.

The actuator 18 has the general shape of an internal transverse actuation shaft 80 and a drive arm 82.

In this example, the inner shaft 80 and its drive arm 82 are produced as a single piece from a plastic material by molding.

In order to enable the rotational assembly of the shaft pivoting in both directions with respect to the housing 10, the inner transverse shaft comprises, at each of its two opposite transverse ends, a cylindrical journal 84, said journal 84 being housed rotatably, practically without play, in the complementary housing 44 of the upper part 12, said journal being captured inside this housing by the lower part 50.

Thus, the actuating shaft is mounted rotationally about axis a.

The inner shaft 80 extends in its central portion bounded by a straight rotational drive arm.

By way of non-limiting example, the drive arm 82 extends vertically above the upper wall 22 through the central opening 32 when the switch is in its rest state (shown generally in fig. 1-10).

The drive arm 82 is longitudinally slightly rearwardly offset relative to a vertical plane passing through the axis of rotation a.

The drive arm 82 has a lateral width slightly less than the lateral width of the central opening 32.

The maximum angular position that the actuator 18 can reach in both directions corresponds to the position in which the drive arm 82 abuts against the inclined front transverse edge 34 or the inclined rear transverse edge 36.

The inner shaft 80 includes locking lugs 86 on either side of the drive arm 82, the locking lugs 86 being engageable with the opposing locking notches 46.

As can be seen in fig. 10, in the rest condition shown in fig. 1 to 10, the upper end of the locking lug 86, which has a cylindrical profile, is longitudinally slightly offset towards the front and extends opposite the associated locking slot 46.

The assembly formed by the locking lugs 86 and the locking notches 46 forms a means for locking the drive arm 82 and hence the dual inner contact blade 16 in its second high stable position in which the electrical switch path is interrupted.

Referring to fig. 10, in order to be able to pivot the drive arm 82 clockwise, the drive arm 82 must be forced in the same direction, which should be high enough to be able to retract the locking notch 46 and cause the locking lug 86 to pass angularly to the other side by elastic deformation of the upper spacer.

The inner shaft 80 includes a control cam 88 between each end journal 84 and the central drive arm 82 for deforming the inner contact blades 16.

In cross-section, the cam profile of each control cam 88 is generally triangular and includes a flat horizontal upper section 92, the flat horizontal upper section 92 terminating at a forward control elbow 94 and a rearward control elbow 96.

Each elbow 94, 96 is in the form of a convex cylindrical arch. The forward elbow 94 extends downwardly through an inclined flat section 98.

Each cam 88 is arranged laterally in alignment with the return branch 62 and each inclined flat section 98 of the cam profile extends with play with respect to the front free end active section 64.

In the rest position, the upper surface of the flat, horizontal upper section 92 extends with little vertical play in this example relative to the lower surface 73 of the associated actuating section 72.

The operation of the electrical switch 100 will now be described.

In fig. 1-10, the switch 100 is shown in an at rest position, wherein an electrical switch path is established through each of the two front contact sections 74 of the dual inner contact blades 16, with each inner blade 16 in a bottom position relative to the lower plate 50.

This is the state (or position) of the electrical switch known as the normally closed NC state.

From this normally closed NC state, and in order to cause the electrical switch to change state, it is necessary to apply an actuation force to the drive arm 82 in order to cause it to pivot anticlockwise with reference to figures 9 and 10, and thus cause the inner actuation shaft 80 to pivot in the same direction.

This pivoting causes the rear control elbow 96 to engage the associated actuating section 72 of the inner vane 16 and causes the front contact section 74 to rise. This causes the free end 78 to be lifted vertically upward, the free end 78 no longer contacting the facing portion of the upper surface 51 of the lower plate 50.

Each inner blade 16 is then in a first high position relative to the lower plate 50.

The electrical contacts 51-78 are virtually immediately broken, but the angular actuation stroke by pivoting the actuation arm 82 may continue. Thus, the electrical switch 100 has the ability to absorb significant actuation over travel.

This is the first open unstable position NOi of the electrical switch in which the electrical switch path is interrupted.

This position or condition NOi is unstable because the actuator 18 resiliently returns to its central angular rest position by the action of the return limb 62 once the actuation force is no longer applied to the actuation arm 82.

In fact, in addition to the change of state NC- > NOi of the electric switch, the angular actuation stroke carried out by pivoting the actuation arm 82 simultaneously causes an elastic deformation of each return arm 62, due to the force applied to each return branch 62 by the inclined flat section 98 of the associated cam 88.

When the actuation force applied to the actuation arm 82 is released, the return branches 62 exert their return force on the inner shaft 80, which inner shaft 80 returns to its central angular rest position.

An additional return force is added to the return force exerted by return branch 62, which in this example is exerted by two front contact segments 74 engaging with rear elbows 96.

From the normally closed NC position, and in order to temporarily lock the electrical switch in the stable off state NOs, an actuation force needs to be applied to the drive arm 82 in order to pivot it clockwise with reference to fig. 9 and 10, and thus the inner actuation shaft 80 in the same clockwise direction.

This pivoting causes the forward control elbow 94 to engage the associated actuating section 72 and causes the forward contact section 74 of each inner vane 16 to rise.

This causes the free end 78 to be lifted vertically upward, which no longer contacts the facing portion of the upper surface 51 of the lower plate 50.

Each inner blade 16 is then in a second, high position relative to the lower plate 50.

The electrical contacts 51-78 are virtually immediately opened.

This is the second stable off position NOs of the electric switch, in which the electric switch path is interrupted.

This position or state NOs is stable because the actuator arm 82 remains angularly locked by the locking devices 46-86 when no further actuation force is applied to the actuator arm.

In effect, by pivoting clockwise, the drive arm 82 causes elastic deformation of the upper divider so as to retract the locking notch 46 and angularly pass the locking lug 86 to the other side.

When the actuation force applied to the actuation arm 82 is released, the actuation arm remains locked and the electrical switch remains in its open stable state.

To unlock the electrical switch 100, an unlocking force must be applied to the drive arm 82 in order to pivot it clockwise, which is high enough to again retract (by elastic deformation of the upper spacer) the locking notches 46 and to pass the locking lugs 86 angularly to the other side of the locking notches 46.

The drive shaft 80 is then again in its central angular position and the electrical switching path is re-established.

The dual design of the internal contact blade 16 allows for providing contact redundancy in certain applications that is useful in situations where, for example, the electrical switch is not sealed and a foreign object is introduced between the free end 78 and the upper surface 51.

Second embodiment with a single internal contact blade

The second embodiment shown in fig. 12 to 23 will be described in comparison with the first embodiment.

The differences are basically in the design of the inner contact blade 16 (which is a single blade), the design of the locking means of the drive arm 82 and the design of the electrical connection means of the lower plate 50.

The inner contact blade 16 is a single blade, i.e., it comprises only a single component having the intermediate actuating section 72 and the forward contact sections 74, 78.

The further segment 72', which is symmetrical to the actuating segment 72 and has a design similar to that of the actuating segment 72, does not extend against the contact segment and therefore does not have the function of establishing or interrupting an electrical contact.

However, it engages, by its horizontal lower surface 73 ', with a facing flat horizontal upper section 92 ' of the associated control cam 88 ' in order to reliably determine the central angular rest position of the actuating shaft 80.

Thus, segment 72' has the function of stabilizing actuation shaft 80 in the rest position.

It is also possible to enhance its additional resilient return effect, for example by providing it with a greater stiffness than that of the actuating section 72, or even by initially folding or bending the section 72 ', so that it exerts a pre-stress on the facing flat horizontal upper section 92 ' of the associated control cam 88 '.

By acting as a temporary locking means in the stable normally open position NOs (see in particular fig. 18 and 21), the locking notch 46 is an opening formed in an elastically deformable tab 99, said tab 99 being centrally formed in the lower plate 50 laterally between the two elastic return branches 62.

Additional locking lugs 86 are formed on the lower component of the actuator 18.

More specifically, the drive shaft 80 comprises, in its central portion aligned with the actuation arm 82, a nozzle-like pin which can be housed in the opening 46 when the electric switch is locked in its open stable state NOs (see fig. 21).

The rear profile of the locking lug 86 is shaped to permit unlocking.

Instead of electrical connection tabs, the lower plate 50 comprises two pointed pins 56, said pointed pins 56 projecting longitudinally beyond the open rear transverse surface 28 like the electrical connection section 76 of the internal contact blade.

The operation of the electrical switch 100 according to this second embodiment is the same as that previously described with reference to the first embodiment and is shown in detail in figures 16 to 21.

As can be seen in figures 22 and 23, the electric switch 100 according to the invention can be mounted on a surface 104 of an electronic board, in particular comprising a printed circuit board 102, said printed circuit board 102 being delimited by an edge 106 so as to form an assembly 200.

The switch 100 is proximate to the edge 106 of the plate 102 and, as can be seen in fig. 23, the outer surface of its wall 22 is substantially aligned with the edge 106.

Such assembly and positioning of the electrical switch 100 can allow for automatic unlocking of the electrical switch 100 by contacting the actuating arm 82 to a facing portion of the electronic device or a portion belonging to an automatic assembly device if the assembly 200 is installed in an electronic device (not shown) in the direction indicated by arrow F of figure 23.