US3800251A - Small electro-magnetic contactor - Google Patents

Small electro-magnetic contactor Download PDF

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Publication number
US3800251A
US3800251A US00175832A US17583271A US3800251A US 3800251 A US3800251 A US 3800251A US 00175832 A US00175832 A US 00175832A US 17583271 A US17583271 A US 17583271A US 3800251 A US3800251 A US 3800251A
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US
United States
Prior art keywords
plunger
yoke
coil
bobbin
pair
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
US00175832A
Other languages
English (en)
Inventor
Y Usui
K Shiojima
T Hatakeyama
N Sakao
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 JP8755570U external-priority patent/JPS513402Y1/ja
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Application granted granted Critical
Publication of US3800251A publication Critical patent/US3800251A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/20—Movable parts of magnetic circuits, e.g. armature movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil

Definitions

  • ABSTRACT A small electromagnetic contactor of the type that a plurality of contacts are opened and closed by an actuator coupled to a movable plunger of electromagnetic device responsive to energizing and deenergizing of the latter.
  • the yoke of the electromagnetic device to which the plunger is electromagnetically coupled is fonned from a plate shape magnetic material so as to extend around the coil and plunger to form substantially a closed magnetic path.
  • the present invention has been suggested to eleminate such defect, that is, the problem of magnetic loss between the yoke and the plunger is solved of forming the yoke by bending a single plate of magnetic material.
  • a principal object of the present invention is, therefore, to provide a small-sixed electromagnetic contactor in which the magnetic loss between the yoke and the plunger is negligibly small.
  • Another object of the present invention is to provide a small electromagnetic contactor which is free of any undesirable variance in the attracting operation of the plunger caused by remanence in the yoke and which is also easy to assemble.
  • a further object of the present invention is to provide a small electromagnetic contactor which is so designed as to absorb operating motion of the plunger and, thereby, to minimize vibrations of the electromagnet device, so as to prevent chattering of the contacts.
  • FIGS. 1 and 2 are perspective views of the lower casing portion of the small electromagnetic contactor according to the present invention, showing the electromagnet device with parts disassembled and the device as assembled being installed in the casing, respectively.
  • FIG. 3 is a diagram illustrating-assembling steps of the respective parts of the electromagnet device
  • FIG. 4 is a perspective view of the upper cover por' tion with certain parts disassembled.
  • FIG. 5 is a sectional view of the small electromagnetic contactor according to the present invention.
  • the small electromagnetic contactor of the present invention essentially comprises an upper cover portion and a lower cased portion which are integrally combined as stacked on each other.
  • FIG. 1 shows, in a perspective view, the parts that constitute the lower cased portion.
  • 1 is a plunger composed of a plurality of laminated iron core plates which are integrally fastened together by means of rivets 2.
  • 4 is a short-circuiting ring
  • 6 is a coil
  • 7 is a bobbin which has a hollow space 8 formed centrally therein, in which the plunger 1 is fitted
  • 9 is a recess provided at each of opposed edges of a flange 10 of said bobbin so as to receive therein respective cushion members 14 to be described later
  • 11 and 12 are insulating films
  • 13 is a lead of the coil 6.
  • the cushion members 14 are made of rubber, soft synthetic resin or the like and each of which has at one side thereofa recess 15 adapted to fit with an edge ofa first side plate of a yoke 17.
  • 16 is a pair of plastic films.
  • Designated generally by numeral 17 is a yoke, which is formed by bending substantially in U shape a single piece of magnetic material plate, and comprises a top plate 18, a bottom plate 19, the first side plate 20 and two second side plates 21 and 22. Said second side plates 21 and 22 are bent outwardly at the central parts to form lugs 23 and 24. The plunger 1 can move slidingly between said lugs 23 and 24.
  • 25 is an opening formed at one side of said second side plates. The end portions of said second side plates, at the side opposite to said opening, are joined together by welding or other means, as indicated by a joint line 26.
  • FIG. 27 designates generally a turning frame made of a plastics and provided with arms 29 and 30 extending from both sides of body portion 28. Respective ends of said arms 29 and 30 terminate in hooks 31, 32, and lobes 33, 34 are provided on both external sides of the arms 29 and 30 as shown.
  • 35 is a case made of a plastics in a box shape, which having at its top an opening 36.
  • cut-out grooves 37 which formed to have at their bottoms substantially semi-circular recesses 38 adapted to receive therein the lobes 33, 34 of the turning frame 27 rotatably.
  • 39 shows a step provided at both side surfaces of the case for mounting thereto a separate mounting fixture (not shown) of the device.
  • the plunger 1 is inserted into the hollow space 8 in the bobbin 7 of synthetic resin, around which the coil is preliminarily wound, and then the insulating films 11, 12 are inserted so as to interpose between the plunger 1 and the walles of said hollow space 8 of the bobbin.
  • the connecting pin 5 is inserted into the hole 3 in the plunger 1 and the bobbin 7 is fitted over the yoke 17 from the side of its opening 25. Insulating films 16 are also fitted between the coil and the top plate 18 and bottom plate 19 of the yoke, respectively.
  • each of said cushion members 14 is mounted in such a manner that their recesses 15 fit over the corresponding edges of the first side plate 20 of the yoke.
  • each of said cushion members 14 is fitted at one side in the corresponding recess 9 in the flange 10 of the bobbin 7.
  • FIG. 2 thus assembled unit of the electromagnet device is shown in FIG. 2, as indicated by 40.
  • This assembly 40 is inserted into the case 35 through its top opening 36 and, then, the turning frame 27 is also fitted into the case so that the lobes 33, 34 of said frame 27 are inserted along the cut-out grooves 37 in the inner walls of the case and finally rotatably fitted in the semi circular recesses 38 and the hooks 31, 32 of said turning frame 27 will engage the connecting pin 5.
  • FIG. 4 shows top cover portion 41 of the contactor in perspective view, with its principal parts disassembled.
  • 42 denotes a casing
  • 43 are the partition walls, each of which ia associated with a fixed contact piece 44 provided adjacent thereto.
  • 44 is an opening formed in an end wall of the casing
  • 46 are outer terminals of said fixed contact pieces 44.
  • 47 is an actuating bar made of synthetic resin and provided with a protuberance 48 at the bottom.
  • Said actuating bar 47 is also provided with several windows 49, in each of which a movable contact piece 50 is fitted and always pressed downwardly in the window 49 by a spring.
  • 51 is a spring which is half inserted in a recess formed at the bottom of the actuating bar.
  • Said actuating bar 4'7 is fitted in a space defined by theopening 45 and partition walls 43 in the casing 42.
  • the movable contact pieces 50 are positioned in opposition to the corresponding fixed contact pieces 44 but are pushed up by the spring Sll resting on an inner wall opposite to the opening 45 of the casing, so that the movable and fixed contact pieces will be in their OFF state relative to each other.
  • the upper cover portion thus assembled is then fitted over the opening 36 in the lower cased portion.
  • the protuberance 48 of the actuating bar 47 is contacted with the body portion 28 of the turning frame 27 so as to keep the plunger l in a raised-up state. This situation is shown in FIG. 5.
  • H6. 5 shows a condition where the plunger 1 is not attracted, that is, the contacts are in OFF state. Under this condition, if the coil 6 is excited, the plunger 1 is attracted to move in the direction of arrow X, causing the turning frame 27 to turn about its pivot 34 so that its body portion pushes the protuberance 48 of the actuating bar 47 in the direction of arrow Y, urging the movable contact pieces 50 to move also in the direction of arrow Y-until they contact the corresponding fixed contact pieces to establish the ON state.
  • a single piece of plate shape magnetic material is bent substantially in U shape and the respective ends of the top plate 18 and bottom plate 19 are further bent inwardly to form the second side plates 21 and 22, and substantially in the middle of said second side plates, further, the respective ends thereof are folded back outwardly to form a channel-like opening elongated in the direction in-which the plunger 1 slides, thereby to minimize magnetic loss between the yoke and the plunger.
  • the ends of the second side plates 21, 22 are joined together integrally at least at one side of the channel-like opening, so that a continuous magnetic pass is formed through the junction of the second side plates even the yoke is made of a single sheet of magnetic plate material, whereby magnetic loss between the yoke and the plunger can be minimized and also highly effective electromagnetic force can be obtained. Also, in the present invention, since an opening 25 is formed between the second side plates at the other side of the channel-like opening than said junction, the assembled unit of the coil and plunger can be easily incorporated into the yoke from one laterally opened side thereof. I
  • buffer sheets 11, 12 made of nylon, polyester, flourine resin or the like are losely fitted on the respective faces of the lugs 23, 24 of the yoke, along which the plunger 1 is slided, as well as in the hollow space 8 ofthe coil bobbin 7, there is retained a suitable clearance between the yoke and the plunger,
  • the end of the plunger may strike against the yoke to cause impact vibration of the electromagnet device, and as a reaction against said striking, there is also generated impact vibration in a direction opposite to the direction of movement of the plunger 1.
  • This phenomenon continues for a certain period of time to give rise to a vibration of the yoke. This also causes a so-called chattering phenomenon to occur where the contacts are separated and contacted repeatedly, resulting in damage to the contacts.
  • the buffer members formed from elastic masses of rubber, soft synthetic resin or the like are secured to both front and rear face portions on both sides of the first side plate of the yoke, so as to lessen impact between the plunger and the yoke by the presence of the cushion member at the rear face portion, while alleviating the reaction force produced in the plunger upon hitting the yoke by the cushion member at the front face portion, thereby reducing vibration of the electromagnet device. It is also possible to minimize chattering of the contacts due to the vibration of the plunger.
  • the buffer member In a modified form of the buffer member, if a thick- -wall portion and thin-wall portion are provided, the
  • the member may be selectively used depending on the magnitude of the impact force given.
  • the recesses 9 are formed in the flange 10 of the bobbin 6 and the cushion members 14 are partly fitted in said recessed, so that the cushion members will be prevented from being dislocated after the assembley.
  • these cushion members are fitted into the lower case along the vertical slots in both side walls of the case, together with the electromagnet device, from the top opening of the case, so that they are securely fixed in position and will not be moved after once assembled.
  • a small electromagnetic contactor comprising an insulating ease, fixed contact elements secured in said insulating case, movable contact elements opposed to said fixed contacts and supported resiliently by an actuator disposed slidably in said insulating case, an electromagnetic device comprising a generally U-shaped yoke having a narrowed opening at the open end of the U-shape, a coil bobbin contained and fixed in said yoke, a coil wound on said bobbin, and a plunger disposed coaxially in said bobbin so as to be slidable therein with its head end extending out of the yoke at said narrowed opening of the yoke, and means for operatively coupling said plunger to said actuator, said electromagnetic device and said coupling means being contained in said insulating case along with said contacts and said actuator, said yoke being formed of a single sheet of magnetic material which is bent to form said U-shape with the ends of the two legs at the open end of the U forming (l) a first electromagnetic device

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
US00175832A 1970-08-31 1971-08-30 Small electro-magnetic contactor Expired - Lifetime US3800251A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7697270 1970-08-31
JP8755570U JPS513402Y1 (de) 1970-08-31 1970-08-31

Publications (1)

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US3800251A true US3800251A (en) 1974-03-26

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US00175832A Expired - Lifetime US3800251A (en) 1970-08-31 1971-08-30 Small electro-magnetic contactor

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DE (1) DE2143489C3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100519A (en) * 1975-12-31 1978-07-11 Mac Valves, Inc. Alignment means for a moveable pole-plunger assembly
US4159455A (en) * 1976-07-27 1979-06-26 Siemens Aktiengesellschaft Electromagnetic miniature relay
US4490701A (en) * 1982-08-17 1984-12-25 Sds-Elektro Gmbh Electromagnetic switchgear comprising a magnetic drive and a contact apparatus placed thereabove
US5808534A (en) * 1996-07-30 1998-09-15 Laffey; James Solenoid frame and method of manufacture
US20130222085A1 (en) * 2012-02-28 2013-08-29 Radiall Electromechanical relay housing, relay, switching assembly and electromagnetic relay support assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1894429A (en) * 1930-02-12 1933-01-17 Knapp Monarch Co Electromagnet
US3126782A (en) * 1964-03-31 Solenoid assembly means for actuating piano playing means
US3219781A (en) * 1963-06-10 1965-11-23 Radon Corp Electromagnetic relay with sliding leaf spring movable contacts
US3593240A (en) * 1969-03-10 1971-07-13 Whirlpool Co Solenoid structure having single sheet metal plunger and/or yoke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126782A (en) * 1964-03-31 Solenoid assembly means for actuating piano playing means
US1894429A (en) * 1930-02-12 1933-01-17 Knapp Monarch Co Electromagnet
US3219781A (en) * 1963-06-10 1965-11-23 Radon Corp Electromagnetic relay with sliding leaf spring movable contacts
US3593240A (en) * 1969-03-10 1971-07-13 Whirlpool Co Solenoid structure having single sheet metal plunger and/or yoke

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100519A (en) * 1975-12-31 1978-07-11 Mac Valves, Inc. Alignment means for a moveable pole-plunger assembly
US4159455A (en) * 1976-07-27 1979-06-26 Siemens Aktiengesellschaft Electromagnetic miniature relay
US4490701A (en) * 1982-08-17 1984-12-25 Sds-Elektro Gmbh Electromagnetic switchgear comprising a magnetic drive and a contact apparatus placed thereabove
US5808534A (en) * 1996-07-30 1998-09-15 Laffey; James Solenoid frame and method of manufacture
US20130222085A1 (en) * 2012-02-28 2013-08-29 Radiall Electromechanical relay housing, relay, switching assembly and electromagnetic relay support assembly
US8653922B2 (en) * 2012-02-28 2014-02-18 Radiall Electromechanical relay housing, relay, switching assembly and electromagnetic relay support assembly

Also Published As

Publication number Publication date
DE2143489A1 (de) 1972-04-06
DE2143489B2 (de) 1974-07-11
DE2143489C3 (de) 1975-02-20

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