TECHNICAL FIELD
[0001] The present invention relates to a contact mechanism and, more particularly, to a
contact mechanism to be assembled in a switching device such as an electromagnetic
relay.
BACKGROUND
[0002] Conventionally, there has been disclosed, in Fig. 1 of Patent Document 1, a switching
device such as an electromagnetic relay in which an armature 10 rotates back and forth
in response to applications of voltage and thereby to an electromagnetic coil 8 to
slidingly move an actuator 13 up and down, which in turn moves a contact spring 4
to make and break contacts between a contact button 6 and a second relay contact 3.
[0004] According to the contact mechanism, the actuator 13 has a projection 15 in the form
of bracket at its lower end to engage the contact spring 4 so that a breaking force
is loaded evenly on substantially the entire transverse length of the contact spring.
Then, when breaking the contacts, the movable contact plate 4 receives force acting
only in a substantially vertical direction thereof, causing an increased load in the
separation of the contacts, which needs the armature 10 to generate a greater driving
force and, to this end, results in greater power consumption.
[0005] Further prior art is known from
JP 2003 045309 A which shows a contact mechanism according to the preamble of claim 1.
[0006] Considering those problems, an object of the present invention is to provide a contact
mechanism which uses less power and driving force for making and breaking the contacts,
and an electromagnetic relay with the contact mechanism.
SUMMARY OF THE INVENTION
[0007] The above object is achieved by a contact mechanism according to claim 1.
[0008] Preferred embodiments are subject-matters of the dependent claims.
[0009] According to one aspect of the invention, a contact mechanism for engaging driving
projections provided on one end of a slidable card with a distal end of a movable
contact plate and sliding the card to rotate the movable contact plate, causing movable
contacts on the movable contact plate to connect with and disconnect from stationary
contacts, the contact mechanism comprises a pair of driving projections disposed on
one end of the card and projected in opposite directions from neighborhood corners
of the one end of the card, and a pair of returning elastic tongues disposed so that
they can make contacts with the driving projections, wherein, in condition that the
movable contacts are in contact with the stationary contacts, a distance between one
of the driving projections and one of the returning elastic tongues is smaller than
that between the other of the driving projections and the other of the returning elastic
tongues.
[0010] According to this aspect of the invention, in the operation of disconnection, one
of the driving projections of the card makes a contact with one of the returning elastic
tongues of the movable plate and then the other of the driving projections of the
card makes a contact with the other of the returning elastic tongues of the movable
plate. Therefore, this results in a transitional condition in which only one of the
driving projections is in contact with one of the returning elastic tongues, causing
a torsional force or moment in the movable plate, which needs less force and less
energy consumption in the disconnection of the contacts.
[0011] Also, only an adjustment of the distance between the driving projections of the card
and the returning elastic tongues of the movable plate causes a desired disconnecting
force and torsional moment, which in turn facilitates a design of the contact mechanism
and ensures a precise and reliable control of the force and moment.
[0012] In another aspect of the invention, the contact mechanism takes a state in which
one of the driving projections is in contact with one of the returning elastic tongues
and the other of the driving projections is out of contact with the other of the returning
elastic tongues while the movable contact moves away from the stationary contact.
[0013] According to this aspect of the invention, additionally another advantage is obtained
that the returning elastic tongues move in a stable manner and the contact mechanism
is minimized.
[0014] In another example (not claimed), the pair of driving projections of the card takes
different shapes from each other and the pair of returning elastic tongues of the
moving contact plate takes the same shape.
[0015] According to this example, like previously described contact mechanisms, the returning
elastic tongues are brought into contacts with the driving projections of the card
at different times, which ensures a less energy consumption and a reliable contact
in the contact mechanism.
[0016] According to the invention, the pair of driving projections of the card takes the
same shape and the pair of returning elastic tongues of the moving contact plate takes
different shapes from each other.
[0017] This, according to the invention, increases a design flexibility and facilitates
the design of the contact mechanism.
[0018] In another aspect of the invention, a pair of moving contacts are arranged on the
free end of the moving contact plate so that they are spaced apart from each other
in a widthwise direction of the contact plate, and a pair of stationary contacts are
arranged so that they are spaced away from each other.
[0019] This aspect of the invention allows an employment of a double contact structure in
the contact mechanism, which enhances a contact reliability in the contact mechanism.
[0020] In another aspect of the invention, in order to overcome the problems, an electromagnetic
relay comprises any one of the contact mechanisms described above.
[0021] According to the invention, in the operation of disconnection, one of the driving
projections of the card makes a contact with one of the returning elastic tongues
of the movable plate and then the other of the driving projections of the card makes
a contact with the other of the returning elastic tongues of the movable plate. Therefore,
this results in a transitional condition in which only one of the driving projections
is in contact with one of the returning elastic tongues, causing a torsional force
or moment in the movable plate, which needs less force and less energy consumption
in the disconnection of the contacts.
[0022] Also, only an adjustment of the distance between the driving projections of the card
and the returning elastic tongues of the movable plate causes a desired disconnecting
force and torsional moment, which in turn facilitates a design of the contact mechanism
and ensures a precise and reliable control of the force and moment.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023]
Fig. 1A is a general perspective view showing an electromagnetic relay to which a
first embodiment according to an comparative example is applied and Fig. 1B is a perspective
view showing a state in which a cover is removed from the first embodiment in Fig.
1A.
Figs. 2A and 2B are plan views showing states brought before and after an operation.
Fig. 3 is an exploded perspective view showing the first embodiment illustrated in
Fig. 1A.
Fig. 4 is an exploded perspective view seen at a different angle from Fig. 3.
Fig. 5 is a perspective view showing a box-shaped base illustrated in Fig. 1B.
Fig. 6 is an exploded perspective view showing a main part according to the first
embodiment illustrated in Fig. 1B.
Figs. 7A, 7B and 7C are front, bottom and rear views showing a contact mechanism illustrated
in Fig. 3, respectively.
Figs. 8A and 8B are plan and sectional views showing a card illustrated in Fig. 3.
Figs. 9A and 9B are partial enlarged perspective and bottom views in which a moving
contact terminal is removed from a driving mechanism portion illustrated in Fig. 1B.
Figs. 10A and 10B are front and rear views showing a contact mechanism according to
a second embodiment of the present invention.
Figs. 11A and 11B are a bottom view of a contact mechanism and a perspective view
of a third conductive thin plate spring illustrated in Fig. 10.
EMBODIMENTS OF THE INVENTION
[0024] With reference to Figs. 1A to 10B, an electromagnetic relay according to an embodiment
of the invention will be described.
[0025] An electromagnetic relay according to a first embodiment of the invention includes
a box-shaped base 10, an electromagnet block 20, a rotating block 30, a card 40, a
contact mechanism 50, a support plate 70 and a cover 80.
[0026] As shown in Fig. 5, the base 10, which is configured to be a rectangular thin box,
has an interior separated by an insulating wall 11 into first and second cavities
12 and 13. The insulating wall 11 has a cutout 11a defined therein. The rectangular
base 1 has vertical shallow grooves 14a formed in its external side surfaces. The
grooves 14a accept engaging portions 14b formed in and projected from the bottom surfaces
thereof.
[0027] The first cavity 12 has a bearing 16 provided on a bottom surface thereof for supporting
a rotating shaft 34a of the rotating block 30 which will be described below. Positioning
concaves 17a and 17b are provided on opposite sides of the bearing 16 for positioning
the electromagnet block 20 which will be described below. A concave cutout 18 is provided
on an opening edge of the first cavity 12 for positioning a spool 21 of the electromagnet
block 20 which will be descried below.
[0028] Terminal grooves 15a and 15b are formed on an open edge of the second cavity 13 for
receiving stationary and movable contact terminals 51 and 54 of the contact mechanism
50 which will be described below.
[0029] As shown in Fig. 6, the electromagnet block 20 has a spool 21 with opposite flanges
22a and 22b, a coil 23 wound around the spool 21, an iron core 24 inserted in a through-hole
22c formed in the spool 21, and yokes 25 and 27 fixed on the opposite ends of the
iron core 24 projecting from the opposite flanges. Each of the yokes 25 and 27 is
made of a T-shaped, punched magnetic plate with transversely extended wide portions
26 and 28, which is then right angled to have an L-shaped configuration. A pair of
coil terminals 29 are press inserted in the terminal holes formed in the flange 22a
of the spool 21. The opposite ends of the coil 23 are engaged around the respective
coil terminals 29 and then soldered.
[0030] Five terminal holes may be formed in parallel in the flange 22a, allowing more coil
terminals 29 and/or various arrangements of the coil terminals 29 to be selected as
necessary. The coil terminals 29 are not limited to a straight rod-like terminal,
and it may be have another configuration such as T-shape.
[0031] The rotating block 30 has a rotating block body 33. The rotating block body 33, which
has a permanent magnet (not shown) and a pair of movable iron plates 31 and 32 provided
on opposite sides of the permanent magnet, is made by insert molding. The rotating
block body 33 has a pair of rotating shafts 34a and 34b coaxially projecting from
the opposite upper and lower surfaces of the block body 33 and a driving arm 35 integrally
mounted on a side surface of the block body 33. The driving arm 35 has an engaging
nail 36 formed on a distal end thereof.
[0032] As shown in Fig. 8, the card 40 has a driving hole 41 provided on one side and an
engaging hole 42 provided on the other side. The card 40 also has driving projections
provided on one end thereof and projected in the opposite directions so that it has
a substantially T-shape. The card 40 further has a fail-safe projection provided adjacent
the peripheral edge of the driving hole 41. One driving projection 43 has a greater
thickness than the other driving projection 44 so as to prevent the movable contact
plate 60 does not contact them simultaneously.
[0033] As shown in Figs. 6 and 7, the contact mechanism 50 has a stationary contact terminal
51 and a movable contact terminal 54. For convenience of description, in Fig. 7 distal
ends of the returning elastic tongue 67b and 67c provided on the distal end of the
second conductive thin plate spring 65 are removed in part. The stationary contact
terminal 51 has a pair of stationary contacts 52 and 53 spaced apart from each other
in the widthwise direction and fixed to one end thereof.
[0034] The movable contact terminal 54 supports the movable contact plate 60 fixed to one
side thereof and has an operating hole 55 provided on the other side. The movable
contact plate 60, which is made of three - first, second and third - conductive thin
plate springs 61, 65 and 67 stacked one on top the other, has a pair of movable contacts
56 and 57 spaced apart from each other in the widthwise direction and integrally fixed
to the distal end portion of the plate.
[0035] The first conductive thin plate spring 61 has a spring constant adjusting slit 62a
extending in a longitudinal direction from the proximal to distal end thereof and
a substantially U-shaped fold 63a provided in its mid-portion so as to accommodate
its deformation and then ensure a desired operating characteristic thereof. The distal
end of the spring 61 is forked into three prongs including a central driving elastic
tongue 64a and two reinforcing elastic tongues 64b and 64c provided on opposite sides
of the central tongue.
[0036] The second conductive thin plate spring 65 has a spring constant adjusting slit 62b
extending in a longitudinal direction from the proximal to distal end thereof and
a substantially U-shaped fold 63a provided in its mid-portion so as to accommodate
its deformation and then ensure a desired operating characteristic thereof. The second
conductive thin plate spring 65 has an engaging cutout 66a formed in a distal, central
portion thereof and two prongs provided on opposite sides of the cutout 66a. The prongs
have opposing inner edges thereof which are right angled in the same direction to
form position regulating elastic tongues 66b and 66c.
[0037] The third conductive thin plate spring 67 has a substantially U-shaped fold 63c provided
in its mid-portion so as to accommodate its deformation and then ensure a desired
operating characteristic thereof . The distal end of the spring 67 is forked into
three prongs including a central driving elastic tongue 64a and two reinforcing elastic
tongues which are right angled to form a position regulating elastic tongue 67a and
a pair of returning elastic tongues 67b and 67c.
[0038] The spring constants of the first and second conductive thin plate springs 61 and
65 can be adjusted by changing the widths and/or lengths of the slits 62a and 62b.
This facilitates the adjustment of the spring loads at making and breaking operations
of the contacts, enhancing the design flexibility of the relay.
[0039] As shown in Fig. 3, the support plate 70 has both ends engaged and supported on the
opposing opening edges of the base 10. The rotating shaft 34b of the rotating block
30 is fitted in the bearing hole 71 formed at the center of the plate 70. Also, the
ends 26b and 28b of the wide portions 26 and 28 of the yoke 25 and 27 are fitted in
the positioning rectangular holes 72. This causes that the electromagnet block 20
and the rotating block 30 are positioned precisely.
[0040] The cover 80 takes a rectangular configuration capable of covering the opening of
the base 10, and has an elastic engaging portions 81 extending from respective outer
peripheral edges thereof.
[0041] Description will be made to an assembling of the electromagnetic relay.
[0042] As shown in Figs. 3 and 5, the electromagnet block 20 is positioned in the first
cavity 12 of the base 10 (Fig. 6) with one ends 26a and 28a of the wide portions 26
and 28 of the yokes 25 and 27 fitted in the positioning concaves 17a and 17b on the
bottom surface of the first cavity 12 and also with the flange 22a engaged in the
cutout 18 of the base 10. According to the embodiment, the electromagnet block 20
is positioned in the base 10 at several portions, which is advantageous that it is
precisely assembled in the base. Then, the stationary contact terminal 51 is fitted
and positioned in the groove 15a of the second cavity 13.
[0043] As shown in Figs. 3 and 9, the card 40 is inserted in the operating hole 55 of the
movable contact terminal 54 and is thus assembled into the movable contact plate 60
fixed to the movable contact terminal 54. For convenience of description, the movable
contact terminal 54 is not shown in Fig. 5B.
[0044] Specifically, as shown in Fig. 9, the driving elastic tongue 64a of the first conductive
thin plate spring 61 is inserted in the driving hole 41 of the card 40. The card 40
is positioned or held by engaging the position regulating elastic tongues 66b and
66c of the second conductive thin plate spring 65 on the opposite side surfaces of
the card 40. Also, the position regulating elastic tongue 67a of the third conductive
thin plate spring 67 is engaged on one end of the card 40, and the returning elastic
tongues 67b and 67c are engaged on the driving projections 43 and 44 of the card 40
for the vertical positioning of the card. Further, the engaging nail 36 of the rotating
block 30 is engaged in the engaging hole 42 of the card 40 and then the card 40 is
inserted in the base 10. Thereafter, the card 40 is inserted in the operating cutout
11a of the insulating wall 11 of the base 10, and the movable contact terminal 54
is press fitted and thereby positioned in the terminal groove 15b. Subsequently, the
rotating shaft 34a of the rotating block 30 is fitted in the bearing 16 of the base
10 to rotatably support the rotating block 30.
[0045] Furthermore, the opposite ends of the support plate 70 are engaged and supported
on the opening edges of the base 10, and the rotating shaft 34b of the rotating block
30 is fitted in the bearing hole 71. Also, the other ends 26b and 28b of the wide
portions 26 and 28 in the yokes 25 and 27 are fitted and positioned in the positioning
rectangular holes 72 and 72g. Therefore, the electromagnet block 20 and the rotating
block 30 are precisely positioned in the base 10, which results in a stable operating
characteristic.
[0046] Finally, the cover 80 is positioned to cover the opening portion of the base 10,
and the elastic engaging portion 81 of the cover 80 is engaged with the engaging portion
of the base 10, which completes the assembling of the relay.
[0047] An operation of this present embodiment will be described below.
[0048] As shown in Fig. 2A, in the rotating block 30, the end 32a of the movable iron plate
32 is attracted to the wide portion 26 of the yoke 25 and the other end 31b of the
movable iron plate 31 is attracted to the wide portion 28 of the yoke 27 by the magnetic
force of the permanent magnet (not shown) . This causes that the movable contact plate
60 is attracted toward the movable contact terminal 54 against a spring force thereof
through the card 40, which results in that the movable contact 56 is disconnected
from the stationary contact 52. For convenience of description, the support plate
70 is not shown in Figs. 2A and 2B.
[0049] A voltage is applied to the coil 23 to generate a magnetic force in a direction which
overcomes the magnetic force of the permanent magnet in the rotating block 30. This
allows that one end 31a of the movable iron plate 31 of the rotating block 30 is attracted
to the wide portion 26 of the yoke 25 and the other end 32b of the movable iron plate
32 of the rotating block 30 is attracted to the wide portion 28 of the yoke 27 so
that the rotating block 30 is rotated. This allows the driving arm 35 to force the
card 40, causing the spring force of the movable contact plate 60 to act on the card
40 through the driving elastic tongue 64a, which slidingly moves the card 40 toward
the stationary contact terminal 51. As a result, the movable contact plate 60 is moved
away from the movable contact terminal 54 by its spring force so that the movable
contacts 56 and 57 are brought into contacts with the stationary contacts 52 and 53.
Subsequently, the one end 31a of the movable iron plate 31 of the rotating block 30
is attracted to the wide portion 26 of the yoke 25, and the other end 32b of the movable
iron plate 32 is attracted to the wide portion 28 of the yoke 27. This allows that,
even if the application of the voltage to the coil 23 is halted, the card 40 is immovably
fixed so that the connections between the movable contacts 56 and 57 and the stationary
contacts 52 and 53 are maintained. In this state, a distance between the driving projection
43 and the returning elastic tongue 67b is smaller than that between the driving projection
44 and the returning elastic tongue 67c.
[0050] When a voltage is applied to the coil 23 in the opposite direction, the end 32a
of the movable iron plate 32 is attracted to the wide portion 26 of the yoke 25, and
the other end 31b of the movable iron plate 31 is attracted to the wide portion 28
of the yoke 27, causing the rotating block 30 to rotate in the opposite direction,
which results in that the card 40 is pulled by the engaging nail 36 of the rotating
block 30 to slidingly move away from the stationary contact terminal 51. The driving
projection 43 makes a contact with the returning elastic tongue 67b of the third conductive
thin plate spring 67, and then the driving projection 44 makes a contact with the
returning elastic tongue 67c. This means that during the breakings of the contacts
between the movable and the stationary contacts 56 and 52 and the movable and the
stationary contacts 57 and 53, the card 40 makes a contact with one side of the movable
contact plate 60, acting not only a separating force but also a torsional force or
moment on the third conductive thin plate spring 67 so that the movable contact 56
is disconnected from the stationary contact 52 and then the movable contact 57 is
disconnected from the stationary contact 53. This eases the disconnections between
fused, be that as they may, movable and stationary contacts 56, 57 and 52, 53.
[0051] As shown in Figs. 10 to 10A-11B, the second embodiment of the invention is substantially
the same as the first embodiment except that, the driving projections 43 and 44 of
the T-shaped card 40 have the same configuration and the pair of returning elastic
tongues 67b and 67c provided on the distal ends of the third conductive thin plate
spring 67 have different bending angles (Fig. 11B).
[0052] Therefore, the driving projection 43 is out of contact with the returning elastic
tongue 67b of the third conductive thin plate spring 67 during the contact disconnection
or when the driving projection 44 of the card is in contact with the returning elastic
tongue 67c of the third conductive thin plate spring 67.
[0053] An operation according to the second embodiment is substantially the same as that
in the first embodiment. When an electromagnet block 20 is activated to rotate a rotating
block 30 and thereby sliding a card 40, the movable contacts 56 and 57 simultaneously
contact the stationary contacts 52 and 53 through the first conductive thin plate
spring 61. Even if the voltage application to the coil 23 of the electromagnet block
20 is halted, the card 40 is held in its active position due to the magnetic force
of the permanent magnet and then the connection between the movable contacts 56 and
57 and the stationary contacts 52 and 53 is maintained.
[0054] When the voltage is applied to the coil 23 of the electromagnet block 20 in the opposite
direction, the rotating block 30 is rotated in the opposite direction so that the
card 40 is slidingly moved in the opposite direction through the engaging nail 36
of the rotating block 30. This results in that the driving projection 43 of the card
40 contacts the returning elastic tongue 67c of the third conductive thin plate spring
67 and then the driving projection 44 contacts the returning elastic tongue 67b of
the third conductive thin plate spring 67, which generates a torsional moment in the
movable contact plate 60. This results in that the card 40 makes a contact with one
side of the movable contact plate 60, and then not only the separation force but also
the torsional force is applied to the third conductive thin plate spring 67. As a
result, the movable contact 57 is disconnected from the stationary contact 53 and
then the movable contact 56 is disconnected from the stationary contact 52, which
eases the disconnection between fused, be that as they may, movable and stationary
contacts 56, 57 and 52, 53.
[0055] The electromagnetic relay according to the invention is not limited to that described
above, and the invention can be applied to various electromagnetic relays and electronic
devices.
PARTS LIST
[0056]
- 10
- box-shaped base
- 11
- insulating wall
- 11a
- cutout
- 12
- first cavity
- 13
- second cavity
- 15a, 15b
- terminal groove
- 16
- bearing
- 17a, 17b
- positioning concave
- 18
- cutout
- 20
- electromagnet block
- 21
- spool
- 22a, 22b
- flange
- 23
- coil
- 24
- iron core
- 25, 27
- yoke
- 26, 28
- wide portion
- 29
- coil terminal
- 30
- rotating block
- 31, 32
- movable iron plate
- 33
- block body
- 34a, 34b
- rotating shaft
- 35
- driving arm
- 36
- engaging nail
- 40
- card
- 41
- driving hole
- 42
- engaging hole
- 43
- driving projection
- 45
- fail safe projection
- 50
- contact mechanism
- 51
- stationary contact terminal
- 52, 53
- stationary contact
- 54
- movable contact terminal
- 55
- operating hole
- 56, 57
- movable contact
- 60
- movable contact plate
- 61
- first conductive thin plate spring
- 62a, 62b
- spring constant adjusting slit
- 63a, 63b, 63c
- fold
- 64a
- driving elastic tongue
- 64b, 64c
- reinforcing elastic tongue
- 65
- second conductive thin plate spring
- 66b, 66c
- position regulating elastic tongue
- 67
- third conductive thin plate spring
- 67a
- position regulating elastic tongue
- 67b, 67c
- returning elastic tongue
- 70
- support plate
- 71
- bearing hole
- 72
- positioning rectangular hole
- 80
- cover
- 81
- elastic engaging portion
1. A contact mechanism (50) for engaging driving projections (43, 44) provided on one
end of a slidable card (40) with a distal end of a movable contact plate (60) and
sliding the card (40) to rotate the movable contact plate (60), causing movable contacts
(56, 57) on the movable contact plate (60) to connect with and disconnect from stationary
contacts (52, 53), the contact mechanism (50) comprising:
a pair of driving projections (43, 44) disposed on one end of the card (40) and projected
in opposite directions from neighborhood corners of the one end of the card (40);
and
a pair of returning elastic tongues (67b, 67c) disposed so that they can make contacts
with the driving projections (43, 44) ;
characterized in that,
in condition that the movable contacts (56, 57) are in contact with the stationary
contacts (52, 53), a distance between one of the driving projections (43, 44) and
one of the returning elastic tongues (67b, 67c) is smaller than that between the other
of the driving projections (43, 44) and the other of the returning elastic tongues
(67b, 67c) and
the pair of driving projections (43, 44) of the card (40) takes the same shape and
the pair of returning elastic tongues (67b, 67c) of the movable contact plate (60)
takes different shapes from each other.
2. The contact mechanism (50) according to claim 1, wherein the contact mechanism (50)
takes a state in which one of the driving projections (43, 44) is in contact with
one of the returning elastic tongues (67b, 67c) and the other of the driving projections
(43, 44) is out of contact with the other of the returning elastic tongues (67b, 67c)
while the movable contact (56, 57) moves away from the stationary contact (52, 53)
.
3. The contact mechanism (50) according to claim 1 or 2, wherein a pair of movable contacts
(56, 57) are arranged on the free end of the movable contact plate (60) so that they
are spaced apart from each other in a widthwise direction of the movable contact plate
(60), and a pair of stationary contacts (52, 53) are arranged so that they are spaced
away from each other.
4. An electromagnetic relay comprising the contact mechanism (50) according to any of
claims 1 to 3.
1. Kontaktmechanismus (50) zum Ineingriffbringen von Antriebsvorsprüngen (43, 44), die
an einem Ende einer verschiebbaren Karte (40) bereitgestellt sind, mit einem distalen
Ende einer beweglichen Kontaktplatte (60) und Verschieben der Karte (40), um die beweglichen
Kontaktplatte (60) zu drehen, sodass bewirkt wird, dass sich bewegliche Kontakte (56,
57) auf der beweglichen Kontaktplatte (60) mit feststehenden Kontakten (52, 53) verbinden
und sich von diesen trennen, wobei der Kontaktmechanismus (50) Folgendes umfasst:
ein Paar Antriebsvorsprünge (43, 44), die an einem Ende der Karte (40) angeordnet
sind und in entgegengesetzte Richtungen von benachbarten Ecken des einen Endes der
Karte (40) vorstehen; und
ein Paar elastischer Rückholzungen (67b, 67c), die derart angeordnet sind, dass sie
mit den Antriebsvorsprüngen (43, 44) in Kontakt treten können;
dadurch gekennzeichnet, dass
unter der Bedingung, dass die beweglichen Kontakte (56, 57) mit den feststehenden
Kontakten (52, 53) in Kontakt stehen, ein Abstand zwischen einem der Antriebsvorsprünge
(43, 44) und einer der elastischen Rückholzungen (67b, 67c) kleiner als derjenige
zwischen dem anderen der Antriebsvorsprünge (43, 44) und der anderen der elastischen
Rückholzungen (67b, 67c) ist, und
das Paar Antriebsvorsprünge (43, 44) der Karte (40) die gleiche Form annimmt und das
Paar elastischer Rückholzungen (67b, 67c) der beweglichen Kontaktplatte (60) voneinander
verschiedene Formen annimmt.
2. Kontaktmechanismus (50) nach Anspruch 1, wobei der Kontaktmechanismus (50) einen Zustand
einnimmt, in dem einer der Antriebsvorsprünge (43, 44) mit einer der elastischen Rückholzungen
(67b, 67c) in Kontakt steht und der andere der Antriebsvorsprünge (43, 44) nicht mit
der anderen der elastischen Rückholzungen (67b, 67c) in Kontakt steht, während sich
der bewegliche Kontakt (56, 57) von dem feststehenden Kontakt (52, 53) wegbewegt.
3. Kontaktmechanismus (50) nach Anspruch 1 oder 2, wobei ein Paar beweglicher Kontakte
(56, 57) an dem freien Ende der beweglichen Kontaktplatte (60) derart angeordnet ist,
dass sie in Breitenrichtung der beweglichen Kontaktplatte (60) voneinander beabstandet
sind und ein Paar feststehender Kontakte (52, 53) derart angeordnet sind, dass sie
voneinander beabstandet sind.
4. Elektromagnetisches Relais, umfassend den Kontaktmechanismus (50) nach einem der Ansprüche
1 bis 3.
1. Mécanisme de contact (50) pour engager des protubérances d'entraînement (43, 44),
qui sont prévues sur une extrémité d'une carte pouvant coulisser (40), avec une extrémité
distale d'une plaque de contact mobile (60) et pour faire coulisser la carte (40)
de manière à entraîner en rotation la plaque de contact mobile (60), pour forcer des
contacts mobiles (56, 57) sur la plaque de contact mobile (60) à se connecter avec
des contacts stationnaires (52, 53) et à s'en déconnecter, le mécanisme de contact
(50) comprenant :
une paire de protubérances d'entraînement (43, 44) qui sont disposées sur une extrémité
de la carte (40) et qui font saillie dans des directions opposées depuis des coins
voisins de l'extrémité considérée de la carte (40) ; et
une paire de languettes élastiques de retour (67b, 67c) qui sont disposées de telle
sorte qu'elles puissent réaliser des contacts avec les protubérances d'entraînement
(43, 44) ;
caractérisé en ce que :
sous la condition consistant en ce que les contacts mobiles (56, 57) sont en contact avec les contacts stationnaires (52,
53), une distance entre l'une des protubérances d'entraînement (43, 44) et l'une des
languettes élastiques de retour (67b, 67c) est plus petite que celle entre l'autre
des protubérances d'entraînement (43, 44) et l'autre des languettes élastiques de
retour (67b, 67c) ; et
la paire de protubérances d'entraînement (43, 44) de la carte (40) prend la même forme
et la paire de languettes élastiques de retour (67b, 67c) de la plaque de contact
mobile (60) prend des formes qui sont différentes l'une de l'autre.
2. Mécanisme de contact (50) selon la revendication 1, dans lequel le mécanisme de contact
(50) prend un état dans lequel l'une des protubérances d'entraînement (43, 44) est
en contact avec l'une des languettes élastiques de retour (67b, 67c) et l'autre des
protubérances d'entraînement (43, 44) est désengagée de tout contact avec l'autre
des languettes élastiques de retour (67b, 67c) pendant que le contact mobile (56,
57) s'éloigne du contact stationnaire (52, 53).
3. Mécanisme de contact (50) selon la revendication 1 ou 2, dans lequel une paire de
contacts mobiles (56, 57) sont agencés sur l'extrémité libre de la plaque de contact
mobile (60) de telle sorte qu'ils soient espacés l'un de l'autre dans une direction
de largeur de la plaque de contact mobile (60), et une paire de contacts stationnaires
(52, 53) sont agencés de telle sorte qu'ils soient espacés l'un de l'autre.
4. Relais électromagnétique comprenant le mécanisme de contact (50) selon l'une quelconque
des revendications 1 à 3.