CA1118063A - Electrical terminal and a circuit board edge connector comprising such terminals - Google Patents
Electrical terminal and a circuit board edge connector comprising such terminalsInfo
- Publication number
- CA1118063A CA1118063A CA000344125A CA344125A CA1118063A CA 1118063 A CA1118063 A CA 1118063A CA 000344125 A CA000344125 A CA 000344125A CA 344125 A CA344125 A CA 344125A CA 1118063 A CA1118063 A CA 1118063A
- Authority
- CA
- Canada
- Prior art keywords
- contact
- terminal
- contact surface
- beam portion
- fulcrum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/82—Coupling devices connected with low or zero insertion force
- H01R12/85—Coupling devices connected with low or zero insertion force contact pressure producing means, contacts activated after insertion of printed circuits or like structures
- H01R12/89—Coupling devices connected with low or zero insertion force contact pressure producing means, contacts activated after insertion of printed circuits or like structures acting manually by moving connector housing parts linearly, e.g. slider
Abstract
ABSTRACT
A terminal for use in a zero insertion force printed circuit edge connector comprises a fixed mounting portion and a contact portion with first bowed contact surfaces for engaging a conductor of a printed circuit hoard inserted into the connector along an insertion path. For wiping the conductor free from contaminants, the contact portion is provided with a cantilever beam portion having a bowed second contact surface which engages the conductor prior to the first contact surfaces, so that the beam portion swings about its connection with the remainder of the contact portion to wipe the conductor.
The invention also concerns a zero insertion force circuit board connector provided with such terminals.
A terminal for use in a zero insertion force printed circuit edge connector comprises a fixed mounting portion and a contact portion with first bowed contact surfaces for engaging a conductor of a printed circuit hoard inserted into the connector along an insertion path. For wiping the conductor free from contaminants, the contact portion is provided with a cantilever beam portion having a bowed second contact surface which engages the conductor prior to the first contact surfaces, so that the beam portion swings about its connection with the remainder of the contact portion to wipe the conductor.
The invention also concerns a zero insertion force circuit board connector provided with such terminals.
Description
~L8~63 This invention relates to an electrical terminal and a zero insertion force electrical connector comprisinq such terminals.
Th~re is described in US-A-4,~77,688 an elongate 5 electrical terminal comprising a mounting portion adapted to be secured to a support, and a contact portion which is remote from the mounting portion in the longitudinal direction of the terminal, the contact portion having a first contact surface bowed laterally outwardly of the terminal, the terminal being resiliently deflectable-when the mounting portion is secured to the support, about a first fulcrum proximate to the support, to cause the first contact surface tangentially to engage an electrically conductive surface there beside, in a first plane perpendicular to the electrically conductive surface.
A multiplicit~ of such terminals may be provided in an electrical connector for making electrical connections to an edge of a circuit board or to electrical posts projecting from such a board, the board carrying a complex electrical circuit, for example of a portable calculator, or forming part of the circuitry of a larger and more complex computer.
In such applications it is of the greatest ~5 importance, in the interest of unfalsified operation of the circuits concerned, that the integrity of the connection between the electrically conductive surfaces ~--r?.~` `
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of the board edge conductors (pads) or the posts and the contact surfaces o~ the terminals should not be impaired by contaminant which may be present on the conductors or on the posts.
Such contaminants may include accumulated dust particles, and shards of plastics material which are chipped or scraped from the insulating housing of the connector or from the circuit board as the case may be.
When the housing is assembled with contacts, and during insertion and withdrawal from the housing, of the board or the posts, small shards of plastic may be chipped or scraped from the housing. The shards and accumulated dust particles are not readily cleaned away because they tend to adhere by electrostatic attraction to the circuit 15 board or the posts and to the contacts, and because the ~~
housing cavities enclosing the contacts are small and difficult to clean out.
Where the terminals are included in a conventional connector, the contact surfaces of the terminals are automatically wiped by the circuit board or the posts, during their insertion into the connector resilien-tly to deflect the terminals away ~rom the insertion path of , the circuit board or the posts.
The number of terminals in the connector may, however, be such that the force which must be exerted upon the circuit board or the posts in order to insert them into the connector is undesirably high. In order to avoid this disadvantage, there have been developed so called "zero insertion force" electrical connectors, in which the terminals are initially maintained in an open position in which position the contact surfaces of the terminals 5 are withdrawn from the insertion path of the board or the posts, the terminals then being deflected into a contact position, after the insertion of the board or the posts, so that the contact surfaces of the terminals engage the surfaces of the board edge connectors or the posts.
There is described in US-A-4,077,688 and US-A-4,133,592, a ~ero insertion force electrical connector comprising an insulating housing, a row of elongate resilient electrical terminals each having a mounting portion mounted in a support and la contact portion remote from the mounting portion pro~ect;ing into an opening in the housing for engagement with a male contact member inserted lnto the opening along a:n insertion path, towards the support r the contact portion having a first contact surface which is bowed towards the insertion path, means being provided for resiliently deflecting each terminal ! about a first fulcrum proximate to its junction with the support, from a first angular position in which the ~irst~
contact surface of the terminal is withdrawn from the insertion path to a second anyular position in which the first contact surface tangentially engages a contact surface of the insertion male contact member in a first plane extendin~ perpendicularly to such surface.
t . 4 -~ 6 ~
The present invention proceeds from the .
realization that in the case of such a known zero insertion force connector, the radius of the arc thro~gh which the contact surfaces of the terminals are swun~ when the terminals are deflected towards the board conductors or the posts is too great to permi-t of wiping action between the contact surfaces and the conductors or the posts, which serves effectively to wipe contaminants from the conductors.
According to one aspect of the invention, therefore, in an electrical terminal as defined in the second paragraph of this specification, the contact portion is divided longitudinally of the terminal to provide thereon a beam portion joined at one end to the remàinder of the terminal at a second fulcrum, the other end of the beam portion being free, a second contact surface on tha beam portion being bowed so as to extend laterally beyond the remainder of the contact portion in the same-direction -as the first contact surface, the beam portion being such as to be swingable a~out the second fulcrum by tangen~ial ! engagement of the second contact surface with the conductive surface in a second plane parallel to the first~
plane, prior to the tangential engagement of the conductive surface by the Eirst contact surface, to cause the second contact surface to wipe along the conductive surface so as to intersect the first plane.
According to another aspect of the invention, in a circuit board edge connector as defined in the seventh paragraph of this specification, the contact portion of each terminal is divided longitudinally of the terminal to provide thereon a beam portion joined at one end to the remainder of the terminal at a second fulcrum, the other end of the beam portion being free, a second contact surface being formed intermediate the ends of the beam portion and being bowed to extend laterally beyond the xemainder of the contact portion towards the insertion path, the beam portion being such as to be swingable about the second fulcrum by tangential engagement of the second contact surface with the contact surface of the insertion male contact member, in a second plane parallel to the ~irst plane~ prior to the tangential engagement thereo~
by the first contact surface to cause the second contact surface of the contact portion to wipe along the contact surface of the male contact member so as to intersect the first plane.
. Although there are disclosed in DE-Al-1,7~0,314, DE-Al-2,802,800 and ~U-B-421,864, electrical connectors the terminals of which have free ended beam portions provided with bowed second contact surfaces which engage , an inserted male contact member simultaneously with first bowed contact surfaces of the terminals, in none of these known connectors, is the second contact surface swingable to wipe the contact surface of the inserted male contact member to clear such surface of contaminants, for ~- 6 -t ~
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effective electrical contact by the first contactsurface of the terminal.
For a better understanding of the invention an embodiment thereof will now be described by way of S example with reference to the accompanying drawings in which:-Figure 1 is an enlarged perspeetive view showingpart of an electrieal terminal for a zero insertion force eireuit board edge conneetor shown in Figure 2;
' ~ i.gure 2 is a fragmentar~ perspective vie~, shown partly in section, of a zero insertion force circuit board edge connector mounted on a base and incorpoxating electrical terminals according to Figure l; and Figures 3 and 4 are enlar~ed, fragmentary, diagrammatic side elevational views illustrating successive stages in the opexation of a contac-t portion of the terminal, at it is brought into engagement with a conductor of a circuit board received in the connector.
The connector comprises a housing 12 which has been moulded from a hard plastics insulated material and which is o substantially r~ctangular elongate shape havin~ spaced parallel sid~e walls 14 and end walls (not shown). The side walls 14 define a channel 15 having an oper side for receiving a circuit board 46 (Figures 3 and 4) in the direction of the arrow A
in Figure 2. For guiding the board 46 along a board insertion path A, a plurality of partitions 7, spaced rom one another longitudinally of the housing 12, extend between the side walls 14 and are formed int~grally therewith. Each parti~ion 7 has a central recess 9 at its upper end for rec~iving the board 46, the bottom 18 of the recess 9 providir.g a base or seat for ~he leading ~dge of the board 46. Bet~ieen each pai~ of p~rtitions 7 on each side o~ the housin~ 12 i3 th~re is received an elongat~, spring electrical terminal 1 having an enlarged portion 19 having a struck~out tongue 21 rQsiliently abutting the inner surface of the adjacent side wall 14. ~he terminals 1 extand upwardly beyond the partitions 7, each terminal 1 having a contact portion 20 bowed inwardly of the housing. The terminal 1 and thus the contact portions 20 of op~osite terminals 1 are biased resiliently towards each oWler by virtue of the engagement of the ~ongues 21 with the walls 14. The outer face of each wall 14 is formed towards its lo~er end ~ith a plurality of longitudinally spaced ledges 27 ~ach having a depending outer edge 29, the lower surface of which is un~rcut to form a groo~e. Each of two outer plate-like levers 28 are mounted on one of the side walls 14, each ledge 27 b~ing received in an opening 31 in one of the lev~rs .28, in such a way that the le~r 28 is pivoted, as shown in Fisure 2, to the corresponding side wall 14, for movament towards and away tnerefrom. The upper end of each lever 28 is formed with hooked extensions 37 which are engaged by free end portions 23 of the terminals 1.
Two plate cams 24 are providQd, each for moving ona of the levers 28 towards and away from the side wall 14 upon which it ts pivotally mounted. Each cam 24 is slidabl~ supported on a pluxality of the ledges 27 of its side wall 14, for longitud.inal movement between the side wall 14 and the adjacent lever 28.
Th~ inner surfaces of the cams 24 are provided with xamps 30 ~hich engage upper portions 22 of the walls 14 upon longitudinal movement of the cams 24 in direction '`Y" (Figure 2), to pull the contact portions 20 out of the insertion ~ath '`~" of the ~oard 46, to allo~J its insertion into the channel 15 with zero insertion force, ~ovement of the cams 24 in -the opposite direction (direction "Xl' in Fiqure 2) permittiny the contact portions 20 resiliently to return, to engage printed conductors 47 on the inserted board 46.
Each t~rminal 1 has a post which extends from the housing through an opening 8 in a base in the form of a further printed circuit board 4, a mounting portion fi of the ~ost 2 being embedded in solder in the opening 8, ~hich connects the terminal 1 to a metallic circuit path 10 on the underside of the board 4, and serves to secure the portion 6, mechanically,.in the opening 8.
The movement, described above, of the cams 24 causes the t~rminals 1 each to be deflected about - a first fulcrum 51 which is, generally stated, at the junction on the upper ~as se~n in Figure 2) side of the board 4, between the temrminal 1 and the board 4.
~ zero insertion orce printed circbit ed~e connectox as so far dascribed, is described and shown in ~xeater detail in oux United States Paten~ Specification No. 4,077,~8B.
~L86~
According to the present a~plication; the contact portion 20 of ~ach terminal 1 has been trifurcated, as best se~n in Fi~ura 1, by means of a pair of slits 32 extending longiiudinally of th~ terminal 1, to define a resilient central beam portion 34 presenting an arcuate contact surface 40 and being formed integrally at its upper (as seen in Figuras 1, 3 and 4) end with ~he remainder of the contact portion 20 at a junction 36 therewith which constitutes a second - 10 fulcrum as descr~ed belo~. The portion 34 is substantially S-shaped as seen in side elevation. The opposite end 3~ of th~ beam portion 34 is free as shown in Figures 3 and 4, th2 contact surface 40 being position2d towards the free end 38. The contact surface 40 is bow~d in th2 same direction (i.e. inwardly of th~ channel 15) laterally outwardly of the termina 1 as a pair of arcuate contact surfaces 42 and 44 on the two remaining arms 33 of the contact portion 20, the contact surface 40 lying between, and immediately adjacent to, tne contact surfaces 42 and 44 which have equal radii and are in alignment, as seen in elevation from one end of the channel 15, i.e. in alignment latarally of the terminal 1. Ho~ever, the cor.tact surface 40 normally projects bey~nd ~he contact 25 surfaces 42 and 44, as shown in Figures 1 to 3, When a terminal 1, and thus its contact portion 20, is deflected about its first fulcrum 51, towards `~ -- 10 --the inserted board 46 as the associated cam 24 is being moved in a direction "X", the contact surface 40 of such portion 20, initiall~ engages a printed conducctor 47, as shown in Figure 3 so as to be - 5 tangential therewith at a first point, on a line 48 perpendicular to the plane of the board 46. As the terminal 1 is further deflected towards th~ ~oard 46, the contact surfaces 42 and ~4 of the arms 33 are also brought into engag2ment ~ith the conductor 47 as shown in Figure 4, so as to be tangential there~ith, at second points spac~d downwardly, as seen in Fi~ure 4~ from the said first point, on a furthPr line 52 perpendicular to the plane of the board 46. During such deflection of the terminal :L,.the beam portion 34 is caused to be swung, by virlue of the engagement of tha contact surface 40 with the surface of the conductor 47, about the junction 36, which constitutes a second fulcrum, so that the contact surface 40 is shifted downwardly, in a clockwise (as seen in Figures 3 and 4) sense, along an arc 50 having a radius R which is very much smaller than that of the arc of deflection of the terminal 1. As shown in Figure 4, the arc 50 cuts line 52 at the surface of the conductor 47. The contact surface 40 thus wipes downwardly (as seen in Fi~ures 3 and 4) alon~ the surface o~
the conductor 47, from said first point to the level of said second point, thereb~ tending to wlpe or scruh from the surface of the conductor 47 contaminants which would impair the integrity of the electrical connection between the contact surface 40 and the conductor ~7. ~11 three surfaces 40, 42 and 44 now engage the conductor 47 tan~entially in a con~on plane on the line 52, extending perpendicularly to the plane of the board 46. Any further deflection of the terminal 1 about its fulcrum 51, to~ards the board 46, will incr~ase the contact force between the contact portion 20 and the conductor 47, possibly with some concomitant further wiping movement of the contact surfaces.
The overall width of each contact portion 20 is so chosen that all of the comtact surfaces 40, 42 and 44 thereof ~ngage a common conductor 47 of the board 46 when the corresponding cam 24 has been fully insertedO
Th~ contact surface 40 will tend to wipe away particles of contaminant e.g. shards of plastics material or accumulated dust which may extend across the width of the surace of the conductor 47 so as to clear ~uch surface for engagement by tha contact surfaces 42 and 44.
The terminals 1 could alternatively be used in zero insertion force electrical connectors for mating w~t~ male contact members other than circuit boards, for example electrical Gonnactors as described in our .
36,3 United States Pat~nt Specification No. 4,133,592, for mating with male contact members in the form of electrically conductive ~osts, the contact surfaces 40 o the beam portions 34 serving to wipe contaminants from the electrically conductive contact surfaces of the posts.
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Th~re is described in US-A-4,~77,688 an elongate 5 electrical terminal comprising a mounting portion adapted to be secured to a support, and a contact portion which is remote from the mounting portion in the longitudinal direction of the terminal, the contact portion having a first contact surface bowed laterally outwardly of the terminal, the terminal being resiliently deflectable-when the mounting portion is secured to the support, about a first fulcrum proximate to the support, to cause the first contact surface tangentially to engage an electrically conductive surface there beside, in a first plane perpendicular to the electrically conductive surface.
A multiplicit~ of such terminals may be provided in an electrical connector for making electrical connections to an edge of a circuit board or to electrical posts projecting from such a board, the board carrying a complex electrical circuit, for example of a portable calculator, or forming part of the circuitry of a larger and more complex computer.
In such applications it is of the greatest ~5 importance, in the interest of unfalsified operation of the circuits concerned, that the integrity of the connection between the electrically conductive surfaces ~--r?.~` `
.`'`; ~
.
' `
', ' ' ~ 6 ~
of the board edge conductors (pads) or the posts and the contact surfaces o~ the terminals should not be impaired by contaminant which may be present on the conductors or on the posts.
Such contaminants may include accumulated dust particles, and shards of plastics material which are chipped or scraped from the insulating housing of the connector or from the circuit board as the case may be.
When the housing is assembled with contacts, and during insertion and withdrawal from the housing, of the board or the posts, small shards of plastic may be chipped or scraped from the housing. The shards and accumulated dust particles are not readily cleaned away because they tend to adhere by electrostatic attraction to the circuit 15 board or the posts and to the contacts, and because the ~~
housing cavities enclosing the contacts are small and difficult to clean out.
Where the terminals are included in a conventional connector, the contact surfaces of the terminals are automatically wiped by the circuit board or the posts, during their insertion into the connector resilien-tly to deflect the terminals away ~rom the insertion path of , the circuit board or the posts.
The number of terminals in the connector may, however, be such that the force which must be exerted upon the circuit board or the posts in order to insert them into the connector is undesirably high. In order to avoid this disadvantage, there have been developed so called "zero insertion force" electrical connectors, in which the terminals are initially maintained in an open position in which position the contact surfaces of the terminals 5 are withdrawn from the insertion path of the board or the posts, the terminals then being deflected into a contact position, after the insertion of the board or the posts, so that the contact surfaces of the terminals engage the surfaces of the board edge connectors or the posts.
There is described in US-A-4,077,688 and US-A-4,133,592, a ~ero insertion force electrical connector comprising an insulating housing, a row of elongate resilient electrical terminals each having a mounting portion mounted in a support and la contact portion remote from the mounting portion pro~ect;ing into an opening in the housing for engagement with a male contact member inserted lnto the opening along a:n insertion path, towards the support r the contact portion having a first contact surface which is bowed towards the insertion path, means being provided for resiliently deflecting each terminal ! about a first fulcrum proximate to its junction with the support, from a first angular position in which the ~irst~
contact surface of the terminal is withdrawn from the insertion path to a second anyular position in which the first contact surface tangentially engages a contact surface of the insertion male contact member in a first plane extendin~ perpendicularly to such surface.
t . 4 -~ 6 ~
The present invention proceeds from the .
realization that in the case of such a known zero insertion force connector, the radius of the arc thro~gh which the contact surfaces of the terminals are swun~ when the terminals are deflected towards the board conductors or the posts is too great to permi-t of wiping action between the contact surfaces and the conductors or the posts, which serves effectively to wipe contaminants from the conductors.
According to one aspect of the invention, therefore, in an electrical terminal as defined in the second paragraph of this specification, the contact portion is divided longitudinally of the terminal to provide thereon a beam portion joined at one end to the remàinder of the terminal at a second fulcrum, the other end of the beam portion being free, a second contact surface on tha beam portion being bowed so as to extend laterally beyond the remainder of the contact portion in the same-direction -as the first contact surface, the beam portion being such as to be swingable a~out the second fulcrum by tangen~ial ! engagement of the second contact surface with the conductive surface in a second plane parallel to the first~
plane, prior to the tangential engagement of the conductive surface by the Eirst contact surface, to cause the second contact surface to wipe along the conductive surface so as to intersect the first plane.
According to another aspect of the invention, in a circuit board edge connector as defined in the seventh paragraph of this specification, the contact portion of each terminal is divided longitudinally of the terminal to provide thereon a beam portion joined at one end to the remainder of the terminal at a second fulcrum, the other end of the beam portion being free, a second contact surface being formed intermediate the ends of the beam portion and being bowed to extend laterally beyond the xemainder of the contact portion towards the insertion path, the beam portion being such as to be swingable about the second fulcrum by tangential engagement of the second contact surface with the contact surface of the insertion male contact member, in a second plane parallel to the ~irst plane~ prior to the tangential engagement thereo~
by the first contact surface to cause the second contact surface of the contact portion to wipe along the contact surface of the male contact member so as to intersect the first plane.
. Although there are disclosed in DE-Al-1,7~0,314, DE-Al-2,802,800 and ~U-B-421,864, electrical connectors the terminals of which have free ended beam portions provided with bowed second contact surfaces which engage , an inserted male contact member simultaneously with first bowed contact surfaces of the terminals, in none of these known connectors, is the second contact surface swingable to wipe the contact surface of the inserted male contact member to clear such surface of contaminants, for ~- 6 -t ~
~8C~
effective electrical contact by the first contactsurface of the terminal.
For a better understanding of the invention an embodiment thereof will now be described by way of S example with reference to the accompanying drawings in which:-Figure 1 is an enlarged perspeetive view showingpart of an electrieal terminal for a zero insertion force eireuit board edge conneetor shown in Figure 2;
' ~ i.gure 2 is a fragmentar~ perspective vie~, shown partly in section, of a zero insertion force circuit board edge connector mounted on a base and incorpoxating electrical terminals according to Figure l; and Figures 3 and 4 are enlar~ed, fragmentary, diagrammatic side elevational views illustrating successive stages in the opexation of a contac-t portion of the terminal, at it is brought into engagement with a conductor of a circuit board received in the connector.
The connector comprises a housing 12 which has been moulded from a hard plastics insulated material and which is o substantially r~ctangular elongate shape havin~ spaced parallel sid~e walls 14 and end walls (not shown). The side walls 14 define a channel 15 having an oper side for receiving a circuit board 46 (Figures 3 and 4) in the direction of the arrow A
in Figure 2. For guiding the board 46 along a board insertion path A, a plurality of partitions 7, spaced rom one another longitudinally of the housing 12, extend between the side walls 14 and are formed int~grally therewith. Each parti~ion 7 has a central recess 9 at its upper end for rec~iving the board 46, the bottom 18 of the recess 9 providir.g a base or seat for ~he leading ~dge of the board 46. Bet~ieen each pai~ of p~rtitions 7 on each side o~ the housin~ 12 i3 th~re is received an elongat~, spring electrical terminal 1 having an enlarged portion 19 having a struck~out tongue 21 rQsiliently abutting the inner surface of the adjacent side wall 14. ~he terminals 1 extand upwardly beyond the partitions 7, each terminal 1 having a contact portion 20 bowed inwardly of the housing. The terminal 1 and thus the contact portions 20 of op~osite terminals 1 are biased resiliently towards each oWler by virtue of the engagement of the ~ongues 21 with the walls 14. The outer face of each wall 14 is formed towards its lo~er end ~ith a plurality of longitudinally spaced ledges 27 ~ach having a depending outer edge 29, the lower surface of which is un~rcut to form a groo~e. Each of two outer plate-like levers 28 are mounted on one of the side walls 14, each ledge 27 b~ing received in an opening 31 in one of the lev~rs .28, in such a way that the le~r 28 is pivoted, as shown in Fisure 2, to the corresponding side wall 14, for movament towards and away tnerefrom. The upper end of each lever 28 is formed with hooked extensions 37 which are engaged by free end portions 23 of the terminals 1.
Two plate cams 24 are providQd, each for moving ona of the levers 28 towards and away from the side wall 14 upon which it ts pivotally mounted. Each cam 24 is slidabl~ supported on a pluxality of the ledges 27 of its side wall 14, for longitud.inal movement between the side wall 14 and the adjacent lever 28.
Th~ inner surfaces of the cams 24 are provided with xamps 30 ~hich engage upper portions 22 of the walls 14 upon longitudinal movement of the cams 24 in direction '`Y" (Figure 2), to pull the contact portions 20 out of the insertion ~ath '`~" of the ~oard 46, to allo~J its insertion into the channel 15 with zero insertion force, ~ovement of the cams 24 in -the opposite direction (direction "Xl' in Fiqure 2) permittiny the contact portions 20 resiliently to return, to engage printed conductors 47 on the inserted board 46.
Each t~rminal 1 has a post which extends from the housing through an opening 8 in a base in the form of a further printed circuit board 4, a mounting portion fi of the ~ost 2 being embedded in solder in the opening 8, ~hich connects the terminal 1 to a metallic circuit path 10 on the underside of the board 4, and serves to secure the portion 6, mechanically,.in the opening 8.
The movement, described above, of the cams 24 causes the t~rminals 1 each to be deflected about - a first fulcrum 51 which is, generally stated, at the junction on the upper ~as se~n in Figure 2) side of the board 4, between the temrminal 1 and the board 4.
~ zero insertion orce printed circbit ed~e connectox as so far dascribed, is described and shown in ~xeater detail in oux United States Paten~ Specification No. 4,077,~8B.
~L86~
According to the present a~plication; the contact portion 20 of ~ach terminal 1 has been trifurcated, as best se~n in Fi~ura 1, by means of a pair of slits 32 extending longiiudinally of th~ terminal 1, to define a resilient central beam portion 34 presenting an arcuate contact surface 40 and being formed integrally at its upper (as seen in Figuras 1, 3 and 4) end with ~he remainder of the contact portion 20 at a junction 36 therewith which constitutes a second - 10 fulcrum as descr~ed belo~. The portion 34 is substantially S-shaped as seen in side elevation. The opposite end 3~ of th~ beam portion 34 is free as shown in Figures 3 and 4, th2 contact surface 40 being position2d towards the free end 38. The contact surface 40 is bow~d in th2 same direction (i.e. inwardly of th~ channel 15) laterally outwardly of the termina 1 as a pair of arcuate contact surfaces 42 and 44 on the two remaining arms 33 of the contact portion 20, the contact surface 40 lying between, and immediately adjacent to, tne contact surfaces 42 and 44 which have equal radii and are in alignment, as seen in elevation from one end of the channel 15, i.e. in alignment latarally of the terminal 1. Ho~ever, the cor.tact surface 40 normally projects bey~nd ~he contact 25 surfaces 42 and 44, as shown in Figures 1 to 3, When a terminal 1, and thus its contact portion 20, is deflected about its first fulcrum 51, towards `~ -- 10 --the inserted board 46 as the associated cam 24 is being moved in a direction "X", the contact surface 40 of such portion 20, initiall~ engages a printed conducctor 47, as shown in Figure 3 so as to be - 5 tangential therewith at a first point, on a line 48 perpendicular to the plane of the board 46. As the terminal 1 is further deflected towards th~ ~oard 46, the contact surfaces 42 and ~4 of the arms 33 are also brought into engag2ment ~ith the conductor 47 as shown in Figure 4, so as to be tangential there~ith, at second points spac~d downwardly, as seen in Fi~ure 4~ from the said first point, on a furthPr line 52 perpendicular to the plane of the board 46. During such deflection of the terminal :L,.the beam portion 34 is caused to be swung, by virlue of the engagement of tha contact surface 40 with the surface of the conductor 47, about the junction 36, which constitutes a second fulcrum, so that the contact surface 40 is shifted downwardly, in a clockwise (as seen in Figures 3 and 4) sense, along an arc 50 having a radius R which is very much smaller than that of the arc of deflection of the terminal 1. As shown in Figure 4, the arc 50 cuts line 52 at the surface of the conductor 47. The contact surface 40 thus wipes downwardly (as seen in Fi~ures 3 and 4) alon~ the surface o~
the conductor 47, from said first point to the level of said second point, thereb~ tending to wlpe or scruh from the surface of the conductor 47 contaminants which would impair the integrity of the electrical connection between the contact surface 40 and the conductor ~7. ~11 three surfaces 40, 42 and 44 now engage the conductor 47 tan~entially in a con~on plane on the line 52, extending perpendicularly to the plane of the board 46. Any further deflection of the terminal 1 about its fulcrum 51, to~ards the board 46, will incr~ase the contact force between the contact portion 20 and the conductor 47, possibly with some concomitant further wiping movement of the contact surfaces.
The overall width of each contact portion 20 is so chosen that all of the comtact surfaces 40, 42 and 44 thereof ~ngage a common conductor 47 of the board 46 when the corresponding cam 24 has been fully insertedO
Th~ contact surface 40 will tend to wipe away particles of contaminant e.g. shards of plastics material or accumulated dust which may extend across the width of the surace of the conductor 47 so as to clear ~uch surface for engagement by tha contact surfaces 42 and 44.
The terminals 1 could alternatively be used in zero insertion force electrical connectors for mating w~t~ male contact members other than circuit boards, for example electrical Gonnactors as described in our .
36,3 United States Pat~nt Specification No. 4,133,592, for mating with male contact members in the form of electrically conductive ~osts, the contact surfaces 40 o the beam portions 34 serving to wipe contaminants from the electrically conductive contact surfaces of the posts.
.
Claims (8)
1. An elongate electrical terminal comprising a mounting portion adapted to be secured to a support, and a contact portion which is remote from the mounting portion in the longitudinal direction of the terminal, the contact portion having a first contact surface bowed laterally outwardly of the terminal, the terminal being resiliently deflectable when the mounting portion is secured to the support, about a first fulcrum proximate to the support, to cause the first contact surface tangentially to engage an electrically conductive surface therebeside, in a first plane perpendicular to the electrically conductive surface, wherein the contact portion is divided longitudinally of the terminal to provide thereon a beam portion joined at one end to the remainder of the terminal at a second fulcrum, the other end of the beam portion being free, a second contact surface formed on the beam portion being bowed so as to extend laterally beyond the remainder of the contact portion in the same direction as the first contact surface, the beam portion being such as to be swingable about the second fulcrum by tangential engagement of the second contact surface with the conductive surface in a second plane parallel to the first plane, prior to the tangential engagement of the conductive surface by the first contact surface, to cause the second contact surface to wipe along the conductive surface so as to intersect the first plane.
2. A terminal according to Claim 1, wherein the free end of the beam portion, which is substantially S-shaped as seen in side elevation, is nearer to the mounting portion of the terminal than to the second fulcrum, the second surface being positioned towards the free end of the beam portion.
3. A terminal according to Claim 1, wherein the contact portion is trifurcated, the beam portion extending between two arms of the contact portion which arms are bowed in the same direction as the second contact surface and about equal radii, the arms being aligned with one another laterally of the terminal.
4. A terminal according to Claim 3, wherein the beam portion is formed integrally with the remainder of the terminal, the arms also being formed integrally with the remainder of the terminal at both ends thereof.
5. A zero insertion force electrical connector, comprising an insulating housing, a row of elongate resilient electrical terminals each having a mounting portion mounted in a support and a contact portion remote from the mounting portion and projecting into an opening in the housing for engagement with a male contact member inserted into the opening along an insertion path, towards the support, the contact portion having a first contact surface which is bowed towards the insertion path, means being provided for resiliently deflecting each terminal about a first fulcrum proximate to its junction with the support, from a first angular position in which the first contact surface of the terminal is withdrawn from the insertion path to a second angular position in which the first contact surface tangentially engages a contact surface of the inserted male contact member in a first plane extending perpendicularly to such surface; wherein the contact portion of each terminal is divided longitudinally of the terminal to provide thereon a beam portion joined at one end to the remainder of the terminal at a second fulcrum, the other end of the beam portion being free, a second contact surface being formed intermediate the ends of the beam portion and being bowed to extend laterally beyond the remainder of the contact portion, towards the insertion path, the beam portion being such as to be swingable about the second fulcrum by tangential engagement of the second contact surface with the contact surface of the inserted male contact member, in a second plane parallel to the first plane, prior to the tangential engagement thereof by the first contact surface, to cause the second contact surface of the contact portion to wipe along the contact surface of the male contact member so as to intersect the first plane.
6. A connector according to Claim 5, wherein the one end of the beam portion of each terminal is formed integrally with a free end portion of the terminal, which portion is remote from the support, the beam portion extending into a slot in the contact portion, an arm of the contact portion provided on either side of the slot also being bowed inwardly of the channel.
7. A connector according to Claim 6, wherein the opening is in the form of a channel for receiving a male contact member in the form of a circuit board and the arms are curved about the same radii and are in alignment with one another as seen in elevation from one end of the channel.
8. A connector according to Claim 6, wherein the opening is in the form of a channel for receiving a male contact member in the form of a circuit board and the beam portion is of substantially S-shaped configuration, as seen in elevation from one end of the channel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/018,076 US4288139A (en) | 1979-03-06 | 1979-03-06 | Trifurcated card edge terminal |
| US18,076 | 1979-03-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1118063A true CA1118063A (en) | 1982-02-09 |
Family
ID=21786115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000344125A Expired CA1118063A (en) | 1979-03-06 | 1980-01-22 | Electrical terminal and a circuit board edge connector comprising such terminals |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US4288139A (en) |
| EP (1) | EP0015696B1 (en) |
| JP (1) | JPS55121285A (en) |
| AR (1) | AR218195A1 (en) |
| AT (1) | ATE2638T1 (en) |
| AU (1) | AU526977B2 (en) |
| BR (1) | BR8001217A (en) |
| CA (1) | CA1118063A (en) |
| DE (1) | DE3062102D1 (en) |
| ES (1) | ES248558Y (en) |
| HK (1) | HK2487A (en) |
| MX (1) | MX147541A (en) |
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-
1979
- 1979-03-06 US US06/018,076 patent/US4288139A/en not_active Expired - Lifetime
-
1980
- 1980-01-22 CA CA000344125A patent/CA1118063A/en not_active Expired
- 1980-01-30 AU AU55048/80A patent/AU526977B2/en not_active Ceased
- 1980-02-13 ES ES1980248558U patent/ES248558Y/en not_active Expired
- 1980-02-15 JP JP1675380A patent/JPS55121285A/en active Granted
- 1980-02-25 EP EP80300542A patent/EP0015696B1/en not_active Expired
- 1980-02-25 DE DE8080300542T patent/DE3062102D1/en not_active Expired
- 1980-02-25 AT AT80300542T patent/ATE2638T1/en not_active IP Right Cessation
- 1980-02-26 AR AR280098A patent/AR218195A1/en active
- 1980-02-29 BR BR8001217A patent/BR8001217A/en not_active IP Right Cessation
- 1980-03-03 MX MX181403A patent/MX147541A/en unknown
-
1987
- 1987-01-08 HK HK24/87A patent/HK2487A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE2638T1 (en) | 1983-03-15 |
| JPS55121285A (en) | 1980-09-18 |
| AR218195A1 (en) | 1980-05-15 |
| ES248558Y (en) | 1981-01-01 |
| AU526977B2 (en) | 1983-02-10 |
| AU5504880A (en) | 1980-09-11 |
| JPS6334596B2 (en) | 1988-07-11 |
| BR8001217A (en) | 1980-11-04 |
| EP0015696A2 (en) | 1980-09-17 |
| EP0015696B1 (en) | 1983-02-23 |
| MX147541A (en) | 1982-12-13 |
| EP0015696A3 (en) | 1980-10-01 |
| HK2487A (en) | 1987-01-16 |
| US4288139A (en) | 1981-09-08 |
| DE3062102D1 (en) | 1983-03-31 |
| ES248558U (en) | 1980-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 19990209 |