US3553729A - Electromagnetic relay having adjustable biasing means to prevent chattering of the switch contacts - Google Patents

Electromagnetic relay having adjustable biasing means to prevent chattering of the switch contacts Download PDF

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Publication number
US3553729A
US3553729A US860859A US3553729DA US3553729A US 3553729 A US3553729 A US 3553729A US 860859 A US860859 A US 860859A US 3553729D A US3553729D A US 3553729DA US 3553729 A US3553729 A US 3553729A
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US
United States
Prior art keywords
armature
card
yoke
spring
movable contact
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 - Lifetime
Application number
US860859A
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English (en)
Inventor
Tetsuo Mori
Makoto Iwabuchi
Hideoki Yoshioka
Kenji Ono
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP1968085097U external-priority patent/JPS4633489Y1/ja
Priority claimed from JP2149969U external-priority patent/JPS496268Y1/ja
Priority claimed from JP2454069U external-priority patent/JPS4735478Y1/ja
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Application granted granted Critical
Publication of US3553729A publication Critical patent/US3553729A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H01H50/041—Details concerning assembly of relays
    • H01H2050/046—Assembling parts of a relay by using snap mounting techniques

Definitions

  • This invention relates to improvements in relays.
  • the opening value between the armature and yoke is made to be freely adjusted and, yet, the attraction of the yoke is made to be secured at its maximum value, so that the above discussed problem will be effectively solved.
  • the conventional relays have also in general a defect that, as the part for regulating the position of an element referred to as card at the time when the card is not excited and the part for mounting fixed contacts have been arranged so as to be separated from each other, any errors in the allowance for movement of the card and in contact gap could easily become so large due to accumulated errors between the card length, yoke thickness, fixed contact position and armature hinge position that a complicated adjustment has had to be made by applying a plastic deformation to each element.
  • a clearance or a play is provided between the position in which the armature pushes the card and the position in which the armature is prevented by the card from moving upward, so that no such direct influence of the vibration of armature on the contacts will be caused to occur.
  • a flat type spring is adopted for the hinge spring and, thus, the force applied to the hinged part of the armature can be increased as the attracting action by the yoke progresses, no bending work of the spring is required, and such position errors of the armature can be entirely eliminated.
  • stopper means for upward rotation of the armature in conventional relays have been provided in a part separate from the card, component parts have been inherently increased in number.
  • the stopper means is formed integrally as a part of the card, so that the number of component part is decreased without affecting any of effects or functions of those components.
  • the present invention has been suggested to eliminate the above mentioned defects of the conventional relays.
  • a main object of the present invention is therefore, to provide a relay which is remarkably easy to be adjusted.
  • Another object of the present invention is to provide a relay which prevents effectively any chattering of movable contacts from occurring.
  • a further object of the present invention is to provide a relay in which a contact gap and card allowance are regulated by controllably regulating the card position and, therefore, it is not required to give any plastic deformation to a terminal plate
  • Another object of the present invention is to provide a relay whose return characteristics are improved.
  • FIG. 1 is a partly sectioned perspective view of a relay of the present invention with a cover and base plate as removed.
  • FIG. 2 is a perspective view of the relay as disassembled of the present invention as shown in FIG. 1.
  • FIG. 3 shows a frame for coil and fixed contacts in the relay of FIGS. 1 and 2, FIG. 3A being a plan view and FIG. 3B being a front elevation.
  • FIG. 4A is a side view of the relay as assembled of the present invention and FIG. 4B is a sectioned view taken along line IV-IV in FIG. 4A.
  • FIG. 5 is an explanatory view showing a method of assembling the respective components in FIG. 2.
  • FIGS. 6A through 6H show a sequence of an operational travel of the armature and sequential opening and closing states of contacts according to the present invention.
  • FIG. 7 shows diagrammatically the relationship of the operational travel of the armature to the attraction force of yoke and the resistance force of the armature.
  • 1 is an E type yoke of a magnetic material provided with a central leg 2, side legs 3 and 3 and slots 4 and 4' outside said side legs 3 and 3', respectively.
  • 5 is a gap between said central leg 2 and respective side legs 3 and 3.
  • 6 is a frame made of a molded synthetic resin, for carrying coil winding and fixed contacts.
  • 7 is a bobbin section of the frame
  • 8 and 8' are flanges
  • 9 is a stopper provided outside the flange 8
  • 10 is a terminal section provided with fixed contacts 11 and 11 at respective ends, each of which being aligned with the other on a horizontal line, ie, in a parallel relation to the bobbin axis.
  • 12 is a terminal for the respective fixed contacts
  • 13 is a terminal for each end of the coil.
  • a gap 15 is provided on each side of a connecting part 14 between the inside of the terminal plate 10 and the flange 8'.
  • 16 is a hollow chamber which is made in the bobbin 7 and in which the central leg 2 of the yoke 1 is to be inserted.
  • armature 17 is a U-shaped armature of a magnetic material having a leg 18 on each side.
  • a dowel pin 19 is provided in each corner of said armature on its upper surface.
  • 20 is an adjusting plate provided with a central spring part 20a on one side, a side spring part 20b on each side of said central spring part 20a as separated from each other, and hole 21 in each corner for receiving said dowel pin 19'.
  • 22 is a flat plate type hinging spring for the armature 17, provided with a window 23 in the center.
  • a slot 24 is made on each side of said window.
  • 25 is a hole made in the corner for receiving the dowel pin 19 of the armature.
  • the holes 21 of the adjusting plate 20 are fitted to the dowel pins 19 of the armature 17, the holes 25 of the hinging spring 22 are fitted further thereon, and the upper part of each dowel pin is clampingly deformed so as to integrally combine the armature 17, adjusting plate 20 and hinging spring 22 so that an armature block 26 will be formed.
  • 27 is a first movable contact block.
  • 28 is a U-shaped block body made of a synthetic resin and provided with slots 29 and 29' on respective sides.
  • 30 and 30 are a set of first movable contact springs molded integrally with said block body 28 in a parallel relation to each other, provided with downwardly directed contacts 31 and 31', respectively, at their tips, and branched respectively into two with a groove in the longitudinal direction.
  • 32 and 32' are terminals of said movable contact springs 30- and 30', respectively, and are pulled out of the block body 28 on the other side of the movable contact springs.
  • 33 is a second movable contact block.
  • 34 is a main block body made of a synthetic resin substantially in a rectangular shape and provided with slots 35 and 35 on respective sides.
  • 36 and 36 are second movable contact springs molded integrally with said block body 34 so as to be parallel with each other, provided with upwardly directed contacts 37 and 37, respectively, at their tips, and each branched likely into two with a groove in the longitudinal direction.
  • 38 is a terminal for each of said movable contact springs and is pulled out of the block body 34 on the other side of the movable contact spring.
  • 39 is a return spring molded to the block body 34 between said second movable contact springs 36 and 36'.
  • the top 40 of said spring has an action of pressing the bottom 42 of a card 41.
  • 41 is a card made of a synthetic resin as an electric insulating material, substantially in the form of U, which is provided with upstanding arms 44 and 44' at right angles with respect to base portion 43 on respective sides of it.
  • the arms 44 and 44' are provided with upper projections 45 and 45 on respective sides in the upper parts. As described later, these projections 45 and 45 are to engage with stepped parts 17' in the inside corners of the armature 17.
  • lower projections 46 and 46' are provided on respective sides of the base 43.
  • 47 is a U- shaped clamping metal piece having a notch 48 on each side of each upstanding side plate.
  • 49 is a retaining plate provided at each end with an notch 50 to engage with the notch 48 of the clamping metal piece 47.
  • the 51 is a coil wound around the bobbin 7.
  • the coil is connected at both ends to the coil terminals 13 and 13'.
  • 52 is a base plate or a bid provided with a projection 54 on each side wall 53.
  • 55 is a set of holes through which the coil terminal, fixed contact terminals and first and second movable contact terminals are led out.
  • 56 is a case for covering the relay and provided on the side wall with a window 57 with which the projection 54 of the lid 52 fits.
  • the central leg 2 of the yoke 1 is inserted into the hollow chamber 16 of the bobbin 7 (in which the coil 51 is shown in chain lines here) formed integrally with the frame 6. Then, the armature block 26 is mounted on the above mentioned combination of the frame and yoke so that the flange 8 will fit on the slot 24 provided in the window 23 of the hinging spring 22.
  • the first movable contact block 27 is then fitted to the lower surface of the frame 6, so that the upper surface of the block body 28 will be in contact with the lower surface of the armature 1, the end surface of the flange 8' of the bobbin 7 will be in contact with the inside of the U-shaped block body 28 and the movable contact spring 30 will be located on the upper side on the upper side of the fixed contact 11.
  • the second movable contact block 33 is then brought into contact with the lower surface of the first movable contact block 27, so that the top 40 of the return spring 39 will press he bottom 42 of the card 41 and the lower projections 46 and 46' of the card 41 will be held between the first movable contact springs 30 and 30' and the second movable contact spirngs 36 and 36'.
  • the upstanding side plates of the clamping metal piece 47 are fitted into the slots 4 and 4 of the yoke 1, through slots 29 and 29 of the first movable contact block 27 and slots 35 and 35' of the second movable contact block 33, and then the notches 50 of the retaining plate 49 mounted on the upper surface of the armature block 26 are fitted into the notches 48 so that thus assembled combination will be tightly clamped as jointed together.
  • the bottom 42 of the card will be pushed up by the top of the return spring 39 (the resiliency of the return spring 39 will press the card upward overcoming the resiliency of the first movable contact springs 30 and 30'), and upper surface of the base portion 43 of the card 41 will be butted against lower surface of the connecting part 14 of the frame 6, that is, upward motion of the card 41 is to be limited by the lower surface of the connecting part 14 of the frame 6.
  • the armature 17 will be engaged with the upper projections 45 and 45' on the card 41 in the corners 17' so that the armature 17 will be prevented from being floated up by the hinge spring 22.
  • the first movable contact springs 30 and 30 will be pushed up by the upper surfaces of the lower projections 46 and 46 of the card 41 so that the contacts 31 and 31 will be separated from the fixed contacts 11 and 11', respectively.
  • the second movable contact springs 36 and 36' will be resiliently directed upward by their own resiliency, so that the contacts 37 and 37 will be normally in contact with the fixed contacts 11 and 11', respectively.
  • the adjusting plate 20 formed integrally with it will also go down, the side spring parts 201; will engage and push the upper surfaces 44a and 44a of the arm 44 downward. Consequently, the card 41 will be pushed down and the second movable contact springs 36 and 36 will be in turn pushed down by the lower surfaces of the lower projections 46 and 46, respectively, of the card, so that the contacts 37 and 37 will be separated from the fixed contacts 11 and 11', respectively, while the contacts 31 and 31' will come into contact with the fixed contacts 11 and 11', respectively.
  • a clearance Z which is referred to as the card allowance between the lower surface of the lower projection 46 of the card 41 and the second movable contact spring 36 in the state that the coil is not excited, even if a wear is produced between the contact 37 and contact 11, the contact will totally not fail.
  • the flat type hinging spring 22 provides to the armature always an angular moment for keeping the gap between the armature and yoke with inward tips of armature legs 18 as a fulcrum, since the spring is fixed to base part of the yoke by means of the clamping member 47 at its end opposite to the other end where the same is jointed with the armature, as previously referred to. Consequently, said tips of legs 18 acting as a fulcrm of the armature, that is, the hinge part of the armature, is always pressed to the yoke with a certain constant resiliency of the spring while the yoke is not excited.
  • FIG. 7 shows the relations between the stroke (moving distance) of the tip of the armature 17 with respect to the yoke 1 and the attraction of the yoke 1 for the armature 17 when electric currents of different intensities are made to How to the exciting coil 51. If the curves I 1 and I represent respectively the attractions when currents I I and I are made to flow to the exciting coil and the intensities of the currents are I I I the larger the intensity of the current, the farther the attraction curve from the original point 0.
  • a bent line AA'B'-CDE'F'G'-H represents a sequence of force of the armature specifically at its free end held by the spring 22, with which force the armature is normally biased to separate away from the yoke as varied due to the returning forces of various springs (such as the hinge spring, contact springs, return spring and adjusting springs 201)), that is, the resistance force of the armature against the above mentioned attraction.
  • the bent line A-A'B'CDE'-F'-P partly shown with a dotted line between GP, represents the resistance force of the armature in the case where no return spring 40 is provided.
  • the resistance force of the armature corresponds only to the force of the hinge spring 22, the latter of which increases as the armature moves to the point A shown in FIG. 7.
  • FIG. 6C shows the moment at which, with the card 41 thus descended, the lower projections 46 and 46', shown as hatched for easy observation, contact the upper surfaces of the second movable contact springs 36 and 36, respectively. That is, the line section BC represents the distance corresponding to the card allowance Z.
  • the resistance force of the armature increases from B to C as shown in FIG, 7.
  • FIG. 6D shows a state, up to which the card 41 has been further attracted down toward the yoke, that the contact pressure of the second movable contact springs 36 and 36' reduces to be zero and the second movable contacts 37 and 37 are just about to leave the fixed contacts 11 and 11', respectively.
  • FIG. 6B shows the next state in which the card 41 has been further descended and the first contacts 31 and 31' have just come into contact with the fixed contacts 11 and 11', respectively. That is, the contact pressure of the first movable contact 31 and 31 on the fixed contact is zero at this instance.
  • the resistance force of the armature increases from D to E as shown in FIG. 7, due to, in this case, the spring force by the second movable springs 36 and 36' will be added to the resistance force of the armature.
  • FIG. 6H The state in which the movement of the card has ended is shown in FIG. 6H.
  • the central spring part 20a of the adjusting plate 20 is contacting the top of the stopper 9 and will bend, and the side spring parts 20b will be respectively in contact with the upper surfaces 44a and 44a of the arm.
  • the side spring parts 20b are omitted in FIG. 6.
  • the resistance force of the armature at this state is of the largest, which is shown in FIG. 7 as H.
  • the gradient of the straight line G'H that is, the resistance force from G to H can be freely varied by adjusting the central spring part 20a of the adjusting plate 20.
  • the attraction curve is on the side of the original point from the point H, the armature will return immediately after being attracted by the yoke. Therefore, the returning characteristic of the armature can be freely varied by adjusting the bending degree of the central spring part 201: of the adjusting plate 20.
  • the position of the card in the relay is so made that the lower surface of the connecting part 14 of the frame 6 in which the fixed contacts 11 and 11 are embedded will come into contact with the upper surface of the base of the card 41.
  • the relative positions of the card and fixed contacts at the time of nonexcitation can be accurately restricted and the contact gap a and card allowance Z can be accurately regulated. Therefore, there is no such conventional operation of regulating the contact gap a and card allowance Z by plastically deforming the terminal plate and the adjustment is very easy according to the present invention.
  • a relay comprising a yoke of a magnetic material in an E-shape having a centre leg and side legs at both sides of said centre leg;
  • a frame made of electrically insulating material including a bobbin section into which said centre leg of the yoke is inserted and a terminal section formed integrally with said bobbin section through a connecting section,
  • said bobbin section being wound therearound an exciting coil for the yoke, said terminal section being provided with fixed contacts and terminals therefor, and said fixed contacts being projected at the bobbin side and on a parallel plane to that of the yoke;
  • first movable contact block butted at its mounting base of an insulating material to said yoke and-having a set of first movable resilient members respectively having contacts at their free ends
  • said second movable contact block having a set of second movable resilient members respectively having contacts at their free ends
  • said second movable contact block including a returning biasing means
  • a card made of an electrically insulating material in a U-shape and arranged between said bobbin section and terminal section of the frame vertically in upward and downward movable manner
  • said card having a pair of upright arms on its base and a pair of lower projections respectively laterally extending at both sides of the base, and
  • said lower projections being positioned between said first and second movable contact resilient members opposing;
  • said armature block being provided at its free end with an armature and an adjusting plate member;
  • said card being urged downwardly by means of said adjusting plate member at the time when the armature is attracted to the yoke with an excitation of the coil, thereby the contacts will be opened and closed.
  • said adjusting plate member having a central resilient part at the centre and a pair of side resilient parts respectively at both sides of said central resilient part as separated from each other, said side resilient parts being so arranged as to urge downwardly upper surface of said upright arms of the card as the armature is attracted by the yoke, and said central resilient part being so arranged as to engage a stopper means formed integrally with the frame immediately before complete attraction of the armature.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US860859A 1968-09-27 1969-09-25 Electromagnetic relay having adjustable biasing means to prevent chattering of the switch contacts Expired - Lifetime US3553729A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP7044968 1968-09-27
JP1968085097U JPS4633489Y1 (enrdf_load_stackoverflow) 1968-09-30 1968-09-30
JP254769 1969-01-13
JP2149969U JPS496268Y1 (enrdf_load_stackoverflow) 1969-03-10 1969-03-10
JP2454069U JPS4735478Y1 (enrdf_load_stackoverflow) 1969-03-19 1969-03-19

Publications (1)

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US3553729A true US3553729A (en) 1971-01-05

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Application Number Title Priority Date Filing Date
US860859A Expired - Lifetime US3553729A (en) 1968-09-27 1969-09-25 Electromagnetic relay having adjustable biasing means to prevent chattering of the switch contacts

Country Status (5)

Country Link
US (1) US3553729A (enrdf_load_stackoverflow)
AT (1) AT300929B (enrdf_load_stackoverflow)
CH (1) CH504774A (enrdf_load_stackoverflow)
FR (1) FR2019040A1 (enrdf_load_stackoverflow)
GB (1) GB1254917A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707691A (en) * 1970-06-03 1972-12-26 Int Standard Electric Corp Electromagnetic flat-type relay
US3811102A (en) * 1971-07-22 1974-05-14 Babcock Electronics Corp Relay
US3946347A (en) * 1973-04-13 1976-03-23 Matsushita Electric Works Ltd. Electromagnetic relay structure
US4010433A (en) * 1974-08-22 1977-03-01 Matsushita Electric Works, Ltd. Electromagnetic relay
JPS5260735U (enrdf_load_stackoverflow) * 1975-10-31 1977-05-04
US4032871A (en) * 1975-02-17 1977-06-28 Hans Sauer Carrier for circuit elements having contact-making terminals
US4041425A (en) * 1975-06-18 1977-08-09 Gte Automatic Electric Laboratories Incorporated Miniature low profile relay
US4041426A (en) * 1975-10-22 1977-08-09 Esterline Electronics Corporation Miniature armature relay
JPS52112755A (en) * 1976-03-18 1977-09-21 Matsushita Electric Works Ltd Electromagnetic relay
US4112399A (en) * 1975-10-08 1978-09-05 Bunker Ramo Corporation Miniature relay
US4290037A (en) * 1978-02-28 1981-09-15 Nippon Electric Co., Ltd. Flat electromagnetic relay
US4383232A (en) * 1981-10-23 1983-05-10 Amf Incorporated Low profile relay
US4486727A (en) * 1981-09-22 1984-12-04 International Standard Electric Corporation Electromagnetic relay
US4743877A (en) * 1985-05-29 1988-05-10 Matsushita Electric Works, Ltd. Electromagnetic relay
US5383799A (en) * 1993-03-26 1995-01-24 Fladung; Philip E. Multi-purpose plug-in electrical outlet adaptor
WO1998050932A1 (de) * 1997-05-05 1998-11-12 Eh-Schrack Components Aktiengesellschaft Elektromagnetisches relais
US20140070909A1 (en) * 2012-09-11 2014-03-13 Omron Corporation Electric magnet device and switch provided therewith

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707691A (en) * 1970-06-03 1972-12-26 Int Standard Electric Corp Electromagnetic flat-type relay
US3811102A (en) * 1971-07-22 1974-05-14 Babcock Electronics Corp Relay
US3946347A (en) * 1973-04-13 1976-03-23 Matsushita Electric Works Ltd. Electromagnetic relay structure
US4010433A (en) * 1974-08-22 1977-03-01 Matsushita Electric Works, Ltd. Electromagnetic relay
US4032871A (en) * 1975-02-17 1977-06-28 Hans Sauer Carrier for circuit elements having contact-making terminals
US4041425A (en) * 1975-06-18 1977-08-09 Gte Automatic Electric Laboratories Incorporated Miniature low profile relay
US4112399A (en) * 1975-10-08 1978-09-05 Bunker Ramo Corporation Miniature relay
US4041426A (en) * 1975-10-22 1977-08-09 Esterline Electronics Corporation Miniature armature relay
JPS5260735U (enrdf_load_stackoverflow) * 1975-10-31 1977-05-04
JPS52112755A (en) * 1976-03-18 1977-09-21 Matsushita Electric Works Ltd Electromagnetic relay
US4290037A (en) * 1978-02-28 1981-09-15 Nippon Electric Co., Ltd. Flat electromagnetic relay
US4486727A (en) * 1981-09-22 1984-12-04 International Standard Electric Corporation Electromagnetic relay
US4383232A (en) * 1981-10-23 1983-05-10 Amf Incorporated Low profile relay
US4743877A (en) * 1985-05-29 1988-05-10 Matsushita Electric Works, Ltd. Electromagnetic relay
US5383799A (en) * 1993-03-26 1995-01-24 Fladung; Philip E. Multi-purpose plug-in electrical outlet adaptor
WO1998050932A1 (de) * 1997-05-05 1998-11-12 Eh-Schrack Components Aktiengesellschaft Elektromagnetisches relais
US6144270A (en) * 1997-05-05 2000-11-07 Eh-Schrack Components Aktiengesellschaft Electromagnetic relay
US20140070909A1 (en) * 2012-09-11 2014-03-13 Omron Corporation Electric magnet device and switch provided therewith
US9117600B2 (en) * 2012-09-11 2015-08-25 Omron Corporation Electric magnet device and switch provided therewith

Also Published As

Publication number Publication date
FR2019040A1 (enrdf_load_stackoverflow) 1970-06-26
CH504774A (de) 1971-03-15
DE1948725B2 (enrdf_load_stackoverflow) 1970-10-08
GB1254917A (en) 1971-11-24
DE1948725A1 (de) 1970-04-23
AT300929B (de) 1972-08-10

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