Field of invention
[0001] The present invention relates to a switch device, for automotive, more particularly
for a dome control module and the like.
Description of the Related Art
[0002] Push-type switches with a manually operated push component through which, in turn,
a switching component itself is actuated are commercially available as push buttons
and as on/off switches or selector switches.
[0003] It is known push type switches comprising a push component that can pivot around
a hinge and providing, between the push component and the switching component, a force-transmission
component. This force transmission component may have the form of a plunger.
[0004] Whatever the location of the push component point the manual force is applied on
and whatever the location of the point along the push component the plunger is in
contact with, the push component will pivot around the hinge. In so doing the push
component pushes the plunger which pushes the switch-component downwards.
[0005] In particular, switch devices are known in which the switch device comprises a plunger
in contact with the middle of a knob pivotally connected to a housing such that a
manual compression of the knob causes the knob to pivots from the outside of the housing
of the switch toward the inside and the plunger to move in the same direction. As
the plunger is in contact with the middle of the knob, the course of the middle of
the knob in a first direction is equal to the course of the plunger in the same direction.
[0006] However, switch devices, in particular for automotive, can be subject to many customer
requirements. These requirements may concern for example the knob shape, the housing
shape, the place of the switching component relative to the knob and/or the housing
and so on.
[0007] Thus, in this case, a solution is to shift the plunger relative to the knob. However,
the plunger displacement in response to the knob displacement may remain an issue,
especially in respect with the device packaging taken as a whole
Summary of the invention
[0008] Consequently, the invention aims to solve the technical problem of providing an assembly
comprising a switch device that will operate respecting customer requirements, and
that requires as little built-in space as possible.
[0009] The invention relates accordingly to an assembly comprising a switch device and a
housing, said switch device being disposed relatively to the housing and comprising:
- a switch,
- a plunger, said plunger extending along a first longitudinal axis,
- a knob pivotally connected to the housing such that the knob pivots around a first
rotational axis, said knob having an actuation zone which is remote from the first
longitudinal axis,
wherein a manual compression of the knob in a first direction around the first rotational
axis on said actuation zone causes the knob to come from a first position to a second
position, a plunger position relative to said switch remaining unchanged during a
displacement of the knob between said first position and said second position, a further
compression of the knob in the first direction causing the knob to come from the second
position to a third position in which the plunger actuates the switch.
[0010] In such an assembly, between the first and the second position of the knob, the knob
does not generate a movement of the plunger toward the switch thanks to a disengagement
effect. Thus, a potential course difference between the actuation zone of the knob
and the plunger is compensated by the present assembly.
[0011] In particular, a ratio one to one between the course of the middle of the knob and
the course of the plunger can be respected by this assembly.
[0012] The assembly may thus be in conformity with design specification coming from various
constraints like packaging constraints dictating the location of the knob actuation
zone, security constraints dictating the location of the switch and standardization
constraints dictating the relative movement of the plunger and the switch.
[0013] The invention can also comprise any of the following features taken individually
or in any technically possible combination:
- in said first position, the knob is free to move relative to the plunger,
- in said second position, the knob is in moving abutment on the plunger,
- the knob is disposed at a surface of the housing,
- the switch and the plunger are disposed inside the housing,
- the plunger comprises a head and a body,
- the knob comprises a head and a body,
- the knob, especially the knob's head, has a first outgrowth,
- the knob, especially the knob's head, has a second outgrowth, said first and second
outgrowth forming a groove,
- the plunger's head is curved,
- the ball joint is articulated inside the groove,
- the plunger's head and the groove have a complementary form,
- the plunger is made of one single component,
- the plunger's head and is integral with plunger body,
- the assembly comprises a support, especially a PCB,
- the switch is a push switch,
- the switch is in connection with the support,
- the switch is in electrical connection with the support,
- a longitudinal distance between the first rotational axis and an upper surface of
the PCB is comprised between 10mm and 20mm,
- a longitudinal distance between the first rotational axis and an upper surface of
the PCB is comprised between 13mm and 15mm,
- the plunger is located inside a shaft located remotely from a second longitudinal
axis,
- the first rotational axis is defined by a hinge,
- the angular stroke of the knob between first and second position is comprised between
4 and 8°,
- the actuation zone M comprises a point M at the middle of the knob,
- in a first position of the plunger, the point M is on a second longitudinal axis parallel
to the first longitudinal axis,
- an intersection point I between the second longitudinal axis and the PCB is at most
at 3mm from the closest edge of the housing,
- the knob is returned to his first position by a return force transmitted by a return
spring,
- the distance between the point M in the first position and the orthogonal projection
of the point M on the second longitudinal axis in the third position is the same distance
that the distance between the orthogonal projection of a point of the plunger in the
first and the third position.
[0014] The invention also relates to a dome control module comprising said assembly.
[0015] The invention will be better understood on the light of the following description
which is only indicative and which is not intended to limit said invention, accompanied
with the following figures:
- Figure 1 is a sectional view of an assembly according to a preferred embodiment of
the invention, wherein the knob is in a first position,
- Figure 2 is a sectional view of an assembly according to the same embodiment of the
invention, wherein the knob is in a third position,
- Figure 3 represents a dome control module according to the invention.
Detailed Description
[0016] As illustrated in figure 1 and 2, the invention relates to an assembly 1 comprising
a switch device 3 and a housing 5. The switch device 3 is disposed relatively to the
housing 5. The switch device 3 comprises a switch 30, a plunger 20 and a knob 10.
[0017] The plunger 20 extends along a first longitudinal axis.
[0018] The knob 10 is pivotally connected to the housing 5 in such way that the knob pivots
around a first rotational axis perpendicular to the sketches on figures 1 and 2.
[0019] An actuation zone (M) of the knob 10 is remote from the first longitudinal axis (A).
[0020] In a first position illustrated in figure 1, the knob 10 is free to move relative
to the plunger 20.
[0021] A manual compression of the knob in a first direction around the first rotational
axis (C) on the actuation zone M causes then the knob to come from a first position
to a second position. Said second position is not shown on the figures.
[0022] In the second position, the knob 10 is in moving abutment on the plunger 20. In other
words, the plunger 20 has not moved yet but any further displacement of the knob in
the same direction will now generate a displacement of the plunger
[0023] More precisely, a further and complete compression of the knob 10 in the first direction
causes the knob to come from the second position to a third position. In said third
position illustrated in figure 2, the plunger actuates the switch.
[0024] As one will have understood, the compression of the knob 10 between the first and
the second position is not transmitted to the plunger 20 but the compression of the
knob 10 between the second and the third position is transmitted to the plunger.
[0025] In absence of manual compression, the knob returns advantageously to its first position.
The knob may return to its first position by a return force transmitted by a return
spring.
[0026] The switch device 3 may be comprised inside the housing 5. The plunger 20 and the
switch are inside the housing.
[0027] The assembly may comprise a bezel 6such that the upper surface of the knob 10 flushes
the surface of the bezel 6.
[0028] The knob 10 comprises a head 12 and a body 14. The plunger 20 comprises a head 22
and a body 24. The knob's head 12 is the part of the knob that comes in moving abutment
on the plunger's head 22.
[0029] In the illustrated embodiment, the knob's head has a first outgrowth 16. The plunger's
head 22 and the knob's head 12 may remain in contact at any position of the knob but
without causing a displacement of the plunger 20 between the first and the second
position. This allows a better stability of the knob 10 between the first and the
third position.
[0030] The knob's head has also a second outgrowth, said first and second outgrowth forming
a groove.
[0031] In such embodiment, the plunger's head 22 slides within the groove between the first
and second position. It is then in contact with a bottom of the groove in the second
position and between the second and third position. The groove allows an even more
enhanced stability of the knob 10 between the first and the third position.
[0032] The plunger's head 22 may have a particular shape that helps to reduce the possible
mechanical constraints caused by the compression of the knob. Here, the plunger's
head 22 is curved. The plunger's head 22 may have in section the shape of a half radius.
[0033] In a preferred embodiment, the plunger's head has a complementary form to said groove.
[0034] In the embodiment described on the figures, the plunger is made of one single component.
More precisely, the plunger's head and is here integral with plunger body.
[0035] The switch 30 may be a push switch. Said switch is in contact with a support. In
a preferred embodiment, the switch 30 is in electrical connection with a PCB (Printed
Circuit Board) 40. Said PCB may define a plan, said plan being orthogonal to the first
longitudinal axis (A).
[0036] A second longitudinal axis (B) is parallel to the first longitudinal axis (A) and
passes by the middle of the knob 10. The plunger may be located inside a shaft 52
located remotely from the second longitudinal axis (B). Said shaft helps to control
the translation movement of the plunger between the second and the third position
and to improve the stability of the assembly.
[0037] Said plunger body is located in said shaft 52. Said shaft 52 is a part of the housing
5. Said plunger body comprises an end in abutment on said switch.
[0038] The first rotational axis (C) may be defined by protrusions on both sides of the
knob 10 cooperating with holes formed on lateral sides of the housing. Alternatively,
said first rotational axis (C) may be defined by a hinge 54. Said hinge helps to prevent
any removing of the knob 10 from the housing 5.
[0039] The knob extends in a longitudinal direction which defines its length. The middle
of the knob is defined by a point in the middle of its length. The actuation zone
M is centered on said point M at the middle of the knob. The activation zone may be
evidenced by any kind of visualization means like a logo, a small recess or protrusion,
especially of the size of a fingertip located on point M.
[0040] As shown in figure 2, between the first and the third position of the knob, each
point of the knob is moving along a circle whose center is defined by the first rotational
axis (C). The radius of the circle depends on the distance between the first rotational
axis (C) and the point of the knob. The farther the point of the knob is from the
rotational axis (C), the larger the radius of the circle.
[0041] For a same angular stroke, the relative displacement of the point M on the middle
of the knob will be inferior to the relative displacement of a second point on the
head of the knob.
[0042] According to embodiment described above, the angular stroke of the knob 10 between
the first and the second position does not involve a first stroke of the plunger's
head 12. Indeed, as already said, between the first and the second position, the knob
10 is free to move relative to the plunger 20. The angular stroke of the knob 10 between
the second and the third position involves a second stroke of the plunger's head 12.
Said second stroke will be transmitted to the plunger as, between the second and the
third position, the knob 10 is in moving abutment on the plunger 20.
[0043] The angular stroke of the knob between first and second position is for instance
comprised between 4 and 8°.
[0044] As shown in figure 1, when the knob is in the first position, the point M is on a
second longitudinal axis (B) parallel to the first longitudinal axis (A). As shown
in figure 2, when the knob 10 is in the third position, the point M is shifted from
the second longitudinal axis (B).
[0045] The distance between the point M in the first position and the orthogonal projection
of the point M on the second longitudinal axis (B) in the third position is inferior
to the distance between a point on the knob's head 12 in the first position and the
orthogonal projection of said knob's head point on the first or second longitudinal
axis in the third position.
[0046] The depth of the groove formed by the two outgrowths 16, 18 allows compensating the
course difference between the actuation zone M of the knob 10 and the plunger 20.
In other words, the distance between the point M in the first position and the orthogonal
projection of the point M on the second longitudinal axis (B) in the third position
is the same distance as the distance between the orthogonal projection of a point
of the plunger in the first and the third position. This allows keeping a ratio one
on one between the course of the middle M of the knob 10 and the course of the plunger
20.
[0047] The intersection between said second longitudinal axis (B) and the PCB defines an
intersection point I.
[0048] In the case of the invention, said intersection point I is at most at 3mm from the
closest edge of the PCB according to electrical circuitry security rules.
[0049] In parallel, a longitudinal distance between the first rotational axis and an upper
surface of the PCB is comprised between 10mm and 20mm, more preferably between 13mm
and 15mm.
[0050] This makes it possible to reduce the longitudinal packaging of the device.
[0051] The stroke of the plunger along the first longitudinal axis (A) may be equal to 0.5mm
to 1.5mm. In the same way, the distance between the point M in the first position
and the orthogonal projection of the point M on the second longitudinal axis (B) in
the third position may be equal to 0.5mm to 1.5mm.
[0052] Figure 3 shows a dome control module 2 according to the invention. Said dome control
module comprises an assembly 1 according the invention. The switch device of said
assembly may comprise any of the technical features described hereinabove.
[0053] The bezel 6 may represent the largest part of the dome control module seen by a user.
Thus, the bezel 6 may be made of a material nobler than the rest of the housing 5
so as to improve the finish of the dome control module perceived by a user.
[0054] The dome control module may be located on the ceiling of a vehicle, between the two
front seats and aligned with the central mirror.
[0055] The invention has been described above with the aid of embodiments shown in the figures,
without limitation of the general inventive concept.
[0056] Many other modifications and variations are suggested by those skilled in the art,
after reflection on the various embodiments illustrated in this application. These
embodiments are given by way of example and are not intended to limit the scope of
the invention, which is determined exclusively by the claims below.
1. An assembly (1) comprising a switch device (3) and a housing (5), said switch device
being disposed relatively to the housing and comprising:
- a switch (30),
- a plunger (20), said plunger extending along a first longitudinal axis (A),
- a knob (10) pivotally connected to the housing (5) such that the knob (10) pivots
around a first rotational axis (C), said knob (10) having an actuation zone M which
is remote from the first longitudinal axis (A),
wherein a manual compression of the knob (10) in a first direction around the first
rotational axis (C) on said actuation zone M causes the knob (10) to come from a first
position to a second position, a plunger (20) position relative to said switch (30)
remaining unchanged during a displacement of the knob (10) between said first position
and said second position, a further compression of the knob (10) in the first direction
causing the knob (10) to come from the second position to a third position in which
the plunger (20) actuates the switch (30).
2. An assembly (1) according to claim 1, wherein the plunger (20) is configured so that
the knob (10) is free to move relative to the plunger (20) between the first position
and the second position, the knob (10) being in moving abutment on the plunger (20)
in second position.
3. An assembly (1) according to any of the preceding claims, wherein the knob (10) has
a first outgrowth.
4. An assembly (1) according to claim 3, wherein the knob (10) has a second outgrowth,
said first and second outgrowth forming a groove.
5. An assembly (1) according to any of the preceding claims, wherein the plunger (20)
comprises a head (22) and a body (24).
6. An assembly (1) according to claim 5, wherein the plunger's head (22) and the knob
(10) have a complementary form.
7. An assembly (1) according to claim 5 or 6, wherein the plunger's head (22) is curved.
8. An assembly (1) according to any of the preceding claims, wherein the switch (30)
is a push switch.
9. An assembly (1) according to any of the preceding claims, comprising a PCB (40), said
switch (30) being in electronical connection with said PCB (40).
10. An assembly (1) according to any of the preceding claims, wherein a longitudinal distance
between the first rotational axis (C) and an upper surface of the PCB (40) is comprised
between 10mm and 20mm.
11. An assembly (1) according to claim 9 or 10, wherein the actuation zone M comprises
a point M at the middle of the knob (10), a second longitudinal axis (B) being parallel
to the first longitudinal axis (A) and passing by said point M, such that an intersection
point I between said second longitudinal axis (B) and the PCB (40) is at most at 3mm
from a closest edge of the PCB (40).
12. An assembly (1) according to claim 11, wherein the plunger (20) is located inside
a shaft (52) located remotely from the second longitudinal axis (B).
13. An assembly (1) according to any of the preceding claims, wherein an angular stroke
of the knob (10) between first and second position is comprised between 4° and 8°.
14. An assembly (1) according to any of the preceding claims, wherein the distance between
the point M in the first position and the orthogonal projection of the point M on
the second longitudinal axis (B) in the third position is the same distance that the
distance between the orthogonal projection of a point of the plunger (20) in the first
and the third position.
15. A dome control module (2) comprising the assembly (1) according to any of the preceding
claims.