FR2527001A1 - ELECTROMAGNETIC RELAY AND ITS ASSEMBLY METHOD - Google Patents

Abstract

THIS RELAY INCLUDES A BOX 1 CONTAINING AN ELECTROMAGNETIC ASSEMBLY WHICH INCLUDES A COIL BODY AROUND WHICH A COIL IS WOUND AND IN WHICH IS HOSTED A MAGNETIC CORE AND A REINFORCEMENT AND TRIGGER PLATE ASSEMBLY. THE OPPOSITE SIDE WALLS OF THE BOX HAVE RECESSES IN WHICH ARE HOUSED CONTACT CARRIER ORGANS WHICH HAVE CONTACTS 14, 15 TO ONE OF THEIR END AND PIN 18B WHICH EXTEND BELOW THE BOX 1 TO THEIR OTHER END. 13 SHAPED BOLTS IN THE SIDE WALLS OF THE CASE 1 ARE COINCIDENT WITH 23 SHAPED HOLES IN THE SIDE PLATES 22 SO THAT WHEN THE SIDE PLATES 22 ARE CORRECTLY POSITIONED, THE CONTACT CARRIERS ARE SANDWICH BETWEEN THE WALLS SIDE AND SIDE PLATES, WHICH ARE THEN WELDED IN PLACE WITH ULTRASONICS.

Description

The present invention relates to improvements

  brought to the relays and it relates more specifically-

  but not exclusively to miniature relays of the type

  used in printed circuit arrangements.

  In known relays of this type, a two-part plastic case is provided with means arranged inside each half of the case to receive a

  electromagnetic assembly consisting of a combined arrangement

  fitted with a cylinder head, a coil and an insulated core Contact holder plates are incorporated during molding inside the wall of each housing half and the halves are typically assembled together by welding

ultrasound.

  This method of manufacturing such relays can create a

  number of problems First, the steam

  during the molding process is likely to contaminate the contacts of the contact carrier plates and thereby increase their electrical resistance Secondly, there are significant difficulties in producing a seal

  welded that is impermeable to moisture.

  An additional problem can also be encountered with regard to the electromagnetic assembly in which, in known relays, the coil is wound directly on the insulated core. In these circumstances, in the case where the relay is overheated, there is the risk that isolation

  melts and a short circuit occurs as a result.

  In addition, in service, the turns located at the unsupported ends of the winding layers can come off and

  fall into the air gap causing failure.

  Consequently, one of the aims of the present invention is to provide an improved type of relay and a method of assembling such a relay so as to avoid

part of the above problems.

  According to the invention, there is provided a relay which comprises a housing containing an electromagnetic assembly and a set of armature and tripping plate and a series of electrically conductive contact-carrying members, some for supplying electric current to the 'together

  electromagnetic and some constituting elements of

  contactor, these contact-carrying members comprising

  ties which extend beyond a base wall of the housing to form electrical connection pins for the relay, each of the contact-carrying members being arranged between

  a lateral element and an external surface of the housing, the-

  said lateral element being fixed to said outer surface

by ultrasonic welding.

  Furthermore, in accordance with the invention, there is provided a

  relay as set out in the immediately preceding paragraph

  tooth in which the electromagnetic assembly comprises a coil body on which a coil is wound and with

  inside which is housed a magnetic core.

  According to another characteristic of the invention, a relay is provided as stated in one or other of the two immediately preceding paragraphs in which the trigger plate is formed from a material electrically

  insulating and is fixed to the frame by means of mounting

  tage fixed by heat sealing or by mechanical pressure.

  According to yet another characteristic of the invention,

  a method of assembling a relay is provided according to the-

  which one has an electromagnetic assembly inside a case comprising a base, opposite side walls and opposite end walls, the electromagnetic assembly comprising a coil body on which a coil is wound and inside which is disposed a core and a cylinder head fixed to one end of the core, we

  positions a frame and trigger plate assembly

  swivel mounted above the electromagnetic assembly

  tick and an elastic contact-bearing member is placed in support

  against the trigger plate and we have a series of gold-

  electrically conductive contact ganes between an element

  side wall and an exterior surface of a side wall

  of the housing, said lateral element being fixed to this surface

  outer face by ultrasonic welding.

  The invention will be described more fully below, uni-

  only by way of example with reference to the accompanying drawings in which:

  Fig 1 shows a sectional view of a mode of reaction

  reading of the invention in a partially constructed state; Fig 2 is a side view of the construction shown in Fig 1 and which further comprises electrically conductive contact carrier members according to the invention;

  Fig 3 shows a side element according to the invention-

tion;

  FIG. 4 represents end views of the characteristics

  ticks shown in Figures 2 and 3, viewed in the direction of arrow A in each of these figures; and Fig 5 shows a cross-sectional view of a final completed construction of an embodiment

of the invention.

  As shown in Fig 1 to which we refer

  ra, an electromagnetic assembly comprising a r magnet Magné

  tick 2, a yoke 3 and a spool 6 is placed in a plastic shell 1 of rectangular shape The yoke 3 is fixed to the end of the core 2, being

  crimped on an end part 4 of smaller sec-

  transverse tion of said core and the coil 6 is wound

  around a plastic reel body 5 inside

  laughter of which the core is placed 2 The end of the body 5

  coil has two protrusions, one of which is visible

  sible in the Figure and has been designated by the reference 7, one of the ends of the wire which forms the winding being wound around each of the protrusions This fixing of the ends of the wire increases the reliability, the insulation resistance and the tension of the dielectric regime A frame 8 is pivotally mounted on the upper surface of the cylinder head 3 and an electrically insulating trigger plate 9 is fixed around one of its ends The trigger plate 9 is provided with pins 9 a which are inserted into holes formed in the frame and heat sealed, instead of being molded around the end of the frame which

  could cause a misalignment of said plate.

2527001,

  A return spring 10 is provided to ensure that the rear

  mature 8 has returned to the position shown after

  was pivoted during the operation of the re-

  but as will be explained in detail below.

  Fig 2, in which the same references have been used as in Fig 1 to designate the same elements, represents a later stage in the construction of the relay,

  which includes the mounting of contact-carrying electrical elements 12

  only conductors which are adapted in strong recesses

  placed in the wall of bo Stier 1, instead of being incorporated

  by molding in the side elements which could provo-

  that the contacts they wear are contaminated The organs

  contact holder 12 are also suitable for sail pins

  lants 13 made of plastic which have come in one piece with the wall of the case 1 made of plastic The ends 18 a to 18 d of the contact-carrying members 12 are electrical connection pins which are intended to be inserted in holes formed in a printed circuit board

  which is not shown in the drawings.

  The contacts 14 and 15 of the contact-holding members 12 as-

  respectively secured the establishment of an electrical connection

  size between pin 18 c and either pin 18 b or pin 18 a A contact spring 20 is carried by a

  pole 16 of the contact-carrying members 12 which establishes a con-

  electrical connection by means of pin 18 c and the end 21 of the contact-carrying spring 20 rests on the contact 15 The contact 17 of the contact-carrying members 12 is electrically connected to the end of the coil wire to supply electrical current to the coil via the pin 18 d The part 19 which joins the pins 18 a and 18 d together is provided during the construction of the relay for

  prevent the pins from being damaged.

  In the present embodiment, an arrangement suitable for

  tick to that shown in Fig-2 is provided on the side

  opposite of the relay and includes a connection to the other end

  mite from the wire of the Aiqsi coil, the relay includes two sets of switch contacts, each comprising a pole 16, a contact 15 normally closed and a contact 14 normally

  open When the relay is actuated, the normal contact

  closed is open and the normally open contact is closed. Fig 3 shows a side plate 22, which is also made of plastic, in which holes 23 are formed and which has a tab 24 coming from molding, Fig 4, which shows end views in the direction

  arrows A in Figs 2 and 3, shows that the nipples sail-

  lants 13 are arranged to coincide with the holes

  23 to ensure a certain positioning of the plate la-

  22 with respect to the plastic case 1 The contact-holding members, which are not visible in FIG.

  4 and which connect the contacts 14, 15 to the connection pins

  electrically including the end terminal 18 b is visible, are thus trapped or "sandwiched" between the wall of the boot 1 and the side plate 22 When the side plate is pressed against the wall of the boot

  tab 24 fits on top of the wall This plate la-

  is finally welded in place with ultrasound.

  FIG. 4 represents an end view of the ends 21 of the contact-carrying springs which are carried above the triggering member 9 thus showing that, in this mode

  embodiment, a contact carrier spring,

  contact, electrical connection pins and a plate

  side are provided, identically, on each side of the relay.

  In Fig 5 to which we will now refer and

  in which we have designated by the same references as pre-

  previously all the parts already shown in the previous views, there is shown a complete construction of the embodiment Part 19 fixed to the ends of the

  pins 18 a to 18 d, as shown in Fig 2 a now

  nant been removed and a cover 25 in transparent plastic material has been fitted on the top of the case 1 to protect the exposed elements of the relay The cover 25 is provided with a pin identification mark 26 which indicates the position of the pin 18 d Protrusions 11

  formed on the base of the shoemaker serve as a stopper when

  that the pins are pushed into the holes of a wafer

printed circuit board.

  During the operation of the relay, electric current is supplied to the coil 6 wound on the coil body 5 by means of the pin 18 d and of the contact 17 and of an identical pin and of a contact provided for the other side of the relay to energize the coil When the

  coil is energized, end Sa of armature 8 is ma-

  genetically attracted to the 2a end of the nucleus

  of the articulated mounting of the armature, the trigger plate

  ment 9 which is fixed to the end of the armature opposite to

  the Sa end is raised when the end 8 a is atti-

  towards end 2 a of the nucleus This action has, therefore

  quent, for the effect of lifting the contact-carrying spring 20 so that the end 21 breaks the contact with the contact and comes into contact with the contact 14 so that an electrical connection is established between the pins 18 c and 18 b and no longer between pins 18 c and 18 a When the

  coil is de-energized, return spring 10 lowers the

  mature (and therefore the trigger plate and the res-

  contact holder) to its original position in the

  which it lies flat on the upper surface of the

  cylinder head 3 so that the end 21 of the holder spring

  tact is in contact with contact 15 again and an electrical connection is again established between the modes

18 c and 18 a.

  It will be understood that although, in this embodiment, two identical sets of electrical contacts are provided (one on each side of the relay housing), there could be only one set of contacts on one side of the housing or alternatively several relays could be used thus providing any number of contacts

  electric In the case where only one set is used, one

  additional tact identical to that designated by the ref-

  rence 17 and a corresponding contact pin required

  to establish an electrical connection with the other

end of the spool thread.

Claims (8)

  1 A relay characterized in that it comprises a box (1) containing an electromagnetic assembly (2,3,5,6) and a set of armature (8) and trigger plate (9) and a series of electrically conductive contact-carrying members (12), some for supplying electric current to the electromagnetic assembly and some constituting switch elements, these contact-carrying members comprising parts (18 a18 d) which extend beyond of a base wall of the housing to form electrical connection pins for the relay, each of the contact-carrying members being disposed between a lateral element and an external surface of the housing, said lateral element being fixed to said surface   exterior by ultrasonic welding.   2 Relay according to claim 1, characterized in that the electromagnetic assembly comprises a coil body (5) on which a coil (6) is wound and   inside which is housed a magnetic core (2).   3 Relay according to claim 2, characterized in that one end of the coil body (5) is provided   of first and second protrusions (7), one of the ends   half of the wire forming the spool (6) being attached to each protuberances.   4 Relay according to one of claims 1, 2 and   3, characterized in that the trigger plate (9) is formed from an electrically insulating material and is fixed to the frame (8) by mounting members (9a)   fixed by heat sealing or mechanical pressure.   Relay according to one of the preceding claims.   teeth, characterized in that the contact-carrying members (12) are housed in recesses provided in the surface   side of a side wall of the housing (-1).   6 Relay according to one of the preceding claims,   characterized in that said outer surface of the housing (1)   is provided with protruding pins (13) arranged so as to coincide   der with holes (23) formed in the side element (22) so as to ensure a certain positioning of the element   lateral with respect to said outer surface.   7 Relay according to one of the preceding claims,   characterized in that the housing (1) and the lateral member (22)   are made of plastic.   8 Relay according to one of the preceding claims,   characterized in that the housing (1) is provided with a cover   (25) made of plastic to provide protection   tion of the exposed elements it contains.   9 Relay according to one of the preceding claims,   characterized in that first and second series of contact-carrying members (12) are each disposed respectively between one of the opposite side walls of the housing (1) and   a respective side element (22).   A method of assembling a relay characterized in that it consists in placing an electromagnetic assembly (2, 3, 5, 6) inside a housing (1) comprising a base, facing side walls opposite and end walls facing each other, the electromagnetic assembly comprising a coil body (5) on which a coil (6) is wound   and inside which is placed a core (2> and a cu-   lasse (3) fixed to one end of the core, to position a set of armature (8) and trigger plate (9) pivotally mounted above the electromagnetic assembly and to place an elastic contact-carrying member (20) in pressing against the trigger plate, and having a series of electrically conductive contact-carrying members (12) between   a side member (22) and an outer surface of a part   lateral king of the case, said lateral element being fixed to   this outer surface by ultrasonic welding.