US3701064A - Push-button switch - Google Patents

Push-button switch Download PDF

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Publication number
US3701064A
US3701064A US212096A US3701064DA US3701064A US 3701064 A US3701064 A US 3701064A US 212096 A US212096 A US 212096A US 3701064D A US3701064D A US 3701064DA US 3701064 A US3701064 A US 3701064A
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US
United States
Prior art keywords
push
button switch
magnet
housing
pusher
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
US212096A
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English (en)
Inventor
Ryohei Kinoshita
Masami Ishizawa
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 JP13333670U external-priority patent/JPS518701Y1/ja
Priority claimed from JP12307070A external-priority patent/JPS5030261B1/ja
Priority claimed from JP13473770U external-priority patent/JPS518703Y1/ja
Priority claimed from JP12332670A external-priority patent/JPS515714B1/ja
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Application granted granted Critical
Publication of US3701064A publication Critical patent/US3701064A/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
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/004—Permanent magnet actuating reed switches push-button-operated, e.g. for keyboards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button

Definitions

  • PATENTEnucrzuszz Q 3,701,064 sum 1DOF 12 PRIQR ART PRIOR ART Fig. /2 Fig. /2b 7 [7 i 'A 4 VIA-'11),
  • This invention relates to a push-button switch and more particularly relates to a snap switch employing a magnetic reaction element e.g. a reed switch as a switching element.
  • the conventional push-button switch can not be mass produced due to its structure and therefore, push-button switches satisfactory in manufacturing cost, performance and equality can not be obtained.
  • the object of the invention is to provide a push-button switch which has an improved pushing touch or keying touch from the human engineering point of view while maintaining the characteristics of the snap switch.
  • Another object of the present invention is to provide a push-button switch which is provided with means to prevent chattering of the contact of the switching element by reducing the rebound of the magnet to the minimum amount possible.
  • a further object of the present invention is to provide a push-button switch having an arrangement wherein the key top member is easily changeable and can never be taken off by a rebound action when it is strongly pushed down because the key top member of the push-button switch is usually a character key, a numeral key or a symbol key as required, and is required to be optionally changeable without difficulty.
  • Another object of the present invention is to provide an economical push-button switch with a lamp indication composed of a switch unit and a lamp indication unit which is changeably mounted on the switch unit and is capable of being in several kinds of indicating states in order that it may be distinguishable in the case where there are a number of push-button switches on the control panel of an electronic equipment.
  • Still another object of the present invention is to provide a push-button switch which is easily produced and assembled.
  • a push-button switch comprises a housing provided with a support means for supporting a magnetic member, a reed switch element fixedly and vertically positioned in the housing, a lower spring member contained in the housing, a magnet mounted on the lower spring which is capable of moving up and down with respect to the reed switch while its upward movement is restrained by the above-mentioned support means and also said magnet is capable of being attracted to the magnetic member in the ordinary state, a pusher member eapable of moving up and down, a first upper spring applied to the pusher member at its one end, and mounted on the magnet at its other end and a second upper spring also mounted on the magnet and vertically distant from the pusher member at a first pushed down displacement of the pusher member whereby before a stage in which the pushed down force applied to the pusher member overcomes the critical resistance of the sum of the initial resilient force of the lower spring and the magnetic attractive force acting between the support means and the magnet, whereby the magnet carries out the downward snap action thus
  • FIG. 1 is a schematic front view of a conventional push-button switch
  • FIG. 2 is a perspective view of a push-button switch according to the present invention.
  • FIG. 3 is a partial breakdown side view of a push-button switch according to the present invention illustrating the main body and a key top member which is positioned so as to cover the main body;
  • FIG. 4(a) and FIG. 4(b) are side views of a push-button switch of the present invention in which FIG. 4(a) illustrates the process of mounting the key top member to the main body, while FIG. 5(b) illustrates the process of removing the key top member from the main y;
  • FIG. 5(a) to FIG. 5(e) are sectional views of a pushbutton switch of the present invention which illustrates the internal arrangement of the push-button switch and several operating states or stages of the push-button switch;
  • FIG. 6 is a diagram illustrating the relationship between the pushing down force and the displacement of the pusher member of push-button switches according to the prior art and of the present invention
  • FIG. 7(a) and FIG. 7(b) are diagrams illustrating the difference between the prior art and the present invention in the rebounding action of the magnets of the respective push-button switches;
  • FIG. 8 is a partially cut out perspective view of the housing and reed switch element assembly of a push button switch of the present invention.
  • FIG. 9(a) to FIG. 9(d) are illustrative views in a continuous molding process of a part of a push-button switch according to the present invention.
  • FIG. 10 is a side view of the main body of a push-button switch illustrating a different side from FIG. 3;
  • FIG. 11 is a perspective view of a preferred embodiment of a magnetic material holding means of a pushbutton switch of the present invention and an attaching plate member to which the push-button switch is attached;
  • FIG. 12(a) and FIG. 12(b) are schematic illustrative views showing opening and closing states of a reed switch element according to the prior art, respectively;
  • FIG. 13(a) and FIG. 13(b) are schematic illustrative views showing opening and closing states of a reed switch element according to the present invention, respectively;
  • FIG. 14 is a perspective view of a push-button switch with lamp indication of the present invention in the state where the key top member is removed;
  • FIG. 15(a) to FIG. 15(c) are partially cut out perspective views of a lamp indication unit of the present invention illustrating its assembly process from the respective members to the completed unit.
  • reed switch element 2 is arranged in the inside of housing 1 of the push-button switch, and operates in response to a vertical movement of magnet 3.
  • This magnet 3 is positioned between and supported by an upper spring 5 and a lower spring 6 and is attracted to a keeper-plate 7.
  • Reference numeral 4 is a key top member which is capable of being pushed down so that magnet 3 moves downward so as to close the reed switch element 2 at reed pieces 8 of the element 2 as shown in FIG. 1(b).
  • This key top member 40 may generally be a character key, numeral key or a symbol key, and is removably fitted to the main body 50 as shown in FIG. 2
  • projections 70 are formed, while in the key top member 40 engaging pawls 41 are formed which engages with the above-mentioned projections 70 of housing 51 as shown in FIG. 3.
  • projections are formed in a shape having a lower face 71, left and right hand side faces 73, 73 spaced a distance d apart and a top face 75 provided with inclining faces 77 at both left and right hand side portions of the top face 75, respectively.
  • the pawls 41 of key top member 40 for engaging with projections 70 are formed in the same thickness as that of the other portions of key top member 40.
  • Claws 45 of pawls 41 which are engageable with the lower face 71 are formed at the lower ends of resilient and flexible supporting portions 42 which are placed in a state independent of the other portions of the key top member 40 by arranging slots 46 and spaces 47 so as to provide lateral flexibility.
  • the spaces 47 on both sides of key top member 40 have respective widths slightly larger than the above-mentioned width d of projections 70.
  • a pair of claws 45, 45 on each side of key top member 40 are formed by a downwardly expanded inner margins 43, 43 and a pair of top margins 44, 44 which are provided with downwards and inwards descending slopes as shown in FIG. 3.
  • a support member 59 for supporting a magnet (not shown) a pusher 57, and a spring 55 shown in FIG. 3 will be explained later.
  • key top member 40 is capable of carrying out an up and down free movement over a vertical distance predetermined and limited by spaces 47, that is to say, the upward movement of key top member 40 is limited by engagement of the top margins 44 of claws 45 with lower face 71 of projections 70 so as to prevent the member 40 from coming off.
  • top margins 44 of claws 45 are formed with inwards descending slopes which enable the margins 44 to easily slip away from engagement with the lower face 71 by expanding the supporting portions 42, 42 as shown by chain lines in FIG. 4(b).
  • FIG. 5 shows the interior arrangement of the pushbutton switch of the present invention and also several operating states from the initial ordinary state (FIG. 5(a)) to the final switched on state (FIG. 5(e)) in successive order.
  • a reed switch element 52 stands vertically in the center of housing 51 which is provided with a holding means 58 for holding a magnetic member 60 at the upper portion of housing 51.
  • This housing 51 also contains a lower spring 56 in its interior, and on the top of the lower spring 56, a magnet 53 is mounted by wayof magnet support member 59. This magnet 53 is attracted to the above-mentioned mag netic member 60 in the ordinary state (FIG. 5(a) refers) of the push-button switch.
  • a vertically movable pusher 57 contains a first upper spring 54 resting on the top end 66 of magnet support member 59 so that the first spring 54 is capable of applying a resilient force to the magnet 53 and moreover, magnet support member 59 is designed so as to be insertable into pusher 57 corresponding to the pusher being pushed, as shown in e. g. FIG. 5(b).
  • a second upper spring 55 also rests on magnet 53, and the distance between its top end and the lower pushingend face 62 of the above-mentioned pusher 57 is a predetermined distance X, which distance defines the later explained first push-down dis placement of the push-button switch of the present invention.
  • distance X is determined by the presence of the first upper spring 54 of which the resilience or the stiffness is generally selected so as to have a value slightly lower than that of the second upper spring 55.
  • reference numerals 101 to 104 show the electrical leads of the push-button switch.
  • pusher 57 moves downwards under the action of the pushing down force linearly increasing from the initial force P and corresponding only to the resistance offered by the first upper spring 54 and undergoes the first pushed down displacement X (FIG.
  • the pushing down force applied to pusher 57 must correspond to the resisting force of the sum of the resilient force exhibited by the first upper spring 54 and the resilient force exhibited by the second upper spring 55, and the pushing down force increases linearly along the line having an increased slope as shown in FIG. 6 according to the increase in downward movement of pusher 57 from the displacement X to the next critical displacement X shown in FIG. 5(0).
  • the operator senses the pushing touch in three steps in such a manner that the first soft touch continues from the beginning to the first pushing down displacement X and then, the second resisting touch appears and lasts up to the critical displacement X and at the critical displacement X,, the final yielding touch is created by the above-mentioned snap action.
  • the operator feels a kind of psychological security from the commencement of pushing the key top member until the point of disconnecting at the first pushed down displacement distance X and thereafter he is psychologically aware of the process preliminary to the final snap action namely the process taking place from the point X, to the critical displacement point X and finally he is rewarded with a definite and satisfying snap action.
  • the push-button switch according to the present invention provides a keying touch full of variety and therefore, it can not only softens operator fatigue but also provides an extremely effective snap switch from the human engineering point of view.
  • the values of the pushing down forces P and P, and the values of displacement distances X, and X are selected as follows from the human engineering point of view.
  • the resilience of the first upper spring 54 is selected so as to be lower than that of the second upper spring 55.
  • the push-button switch of the present invention provides the following advantages.
  • the lower spring 56 serves as a kind of damping member. Therefore, the snap action is simultaneously accompanied by the rebound of magnet 53 so that the magnet 53 reaching to the end portion, is pushed up at once by the lower spring 56.
  • the rebound of magnet 53 is restricted by engagement of magnet support member 59 with pusher 57 at the top end 66 and the inner pushing face 64 as shown in FIG. 5(e).
  • means are provided for preventing magnet 53 from rebound.
  • pusher 57 is further pushed down to the final displacement X as shown in FIG. 5(e) so that the amount of rebound of magnet 53 is restricted to a predetermined value X X as can be seen from a comparison between FIG. 5(d) and FIG. 5(e).
  • the reed switch element 52 can be completely prevented from the chattering which conventionally occurs at the contact points of the reed switch element 52, since the magnetic field of magnet 53 acting upon the reed switch element 52 barely changes because of the above-mentioned restriction of the rebound of magnet 53.
  • FIG. 8 a partial assembly of reed switch element 52 and the above-mentioned housing 51 is shown.
  • electrical leads 101 to 104 are disposed in the same vertical plane P which is perpendicular to the vertical walls 68. This plane P intersects the vertical walls 68 at the center of said walls.
  • housing 51 which is usually made of a moldable compound is nearly symmetrical with respect to this plane P.
  • housing 51 having the above-mentioned electrical leads 101 to 104 disposed in the interior of the housing 51 can be easily carried out by employing a molding die which is symmetrically partible in the direction A as shown in FIG. 8 by the parting plane P.
  • four lead materials 101 to 104 having lengths corresponding to several units of the reed switch element and housing assembly undergo press working so as to form terminal points for the respective unit shown in FIG. 9(a), and then, they are positioned in the molding die so as to be molded and fixed into housing 51. After one unit of electrical leads and housing assembly is completed, the same molding process is repeated for the next unit while using the same electrical lead materials, as shown in FIG. 9(b).
  • a reed switch element 52 is assembled into each unit of the electrical leads and housing assembly through a welding process as shown in FIG. 9(d). Finally, each unit of the reed switch and housing assembly is completed by the final cutting process.
  • H6. 10 is a side view of the main body 50 of the push-button switch of the present invention.
  • the main body 50 is mounted to mounting plate 90 by a means 58a which is a preferred example of the holding means 58.
  • FIG. 1 The details of the holding means 58a and mounting plate 90 are shown in FIG. 1 1.
  • holding means 58a is provided with one pair of mounting legs 82, 82 and another pair of mounting legs 84, 84 at ends of both left and right leg portions of the holding means 58a in a projecting fonn.
  • Fixing of holding means 58 to housing 51 is carried out by engagement of the mounting legs 84, 84 and step portions 78, 78 formed on the sides of housing 51, one side of which is shown in FIG. 10.
  • mounting legs 82, 82 as shown in FIG. 10, for fixing the main body 50 to the mounting plate of e.g. the control panel of the electronic equipment. That is to say, in the mounting plate 90, a number of square openings 92 and cut off portions 91 are formed at the points where the main body 50 of the push-button switch is inserted and is fixed.
  • the push-button switch of the present invention is provided with great ease of assembly.
  • holding means 58a shown in detail in FIG. 11 has also an additional advantage explained, hereinafter, with reference to FIG. 12 and FIG. 13.
  • support plate 7, magnet 3 and reed pieces 8 of the reed switch element which are provided for the conventional push-button switch as shown in FIG. 1, are partially shown, and also, the magnetic flux 4) emitted by magnet 3 is shown.
  • FIG. 13 shows the holding means 58a, magnet 53 and reed pieces of the reed switch element in the present invention.
  • the magnetic flux emitted by magnet 53 is shown as Q.
  • Openings 86 formed in holding means 58a serve to check the movement of the magnet 53 and of course, the dimensions of the openings 86 are selected so as not to increase the above-mentioned leakage.
  • a lamp indication unit 200 which is a preferred embodiment of the present invention is adapted to the above-mentioned push-button switch main body 50, and also, key top member 40 just prior to fitting to the main body 50 is shown.
  • FIG. shows the detailed arrangement of the lamp indication unit 200 of the present invention.
  • lamp indication unit 200 is constructed from a wire portion 210 and a pair of indication lamps 211, together with a pair of suitably formed wires 213, and a socket portion 220.
  • the wire 213 has right-angled and horizontal portions 212, and 213a and a vertical portion 213b extending from one end of wire 213a as shown in FIG. 15(a), and the pair of wires 213 are mechanically and electrically connected to each other by welding the free ends of respective horizontal wires 212 to the lower ends of the respective verticalwires 2l3b so that the portion 210 having a kind of horizontal square shaped wire unit (not given any reference numeral) with a pair of lamps 21 1, and a pair of vertical wires 213b, is constructed.
  • Socket portion 220 is made of heat-resisting, transparent, easily colored, elastic and easily moldable materials such as silicone or neoplane gum and socket portion 220 includes a square marginal portion 222 which is'provided with a circular opening 221 in the center, portions 223, for containing a pair of lamps and rib portions 224 to reinforce the lamp containing portions 223.
  • the square marginal portion 222 is provided with a pair of holes 222a in which is inserted the abovementioned pair of vertical wires 21312 as shown in FIG. 15(0) and a pair of elastically deformable slots 222b for engagement of the lamp indication unit 200 with the main body 50 as hereinafter explained.
  • the main body 50 is provided with a pair of projections 79 having notches 790 (F IG. 8 also refers).
  • the pair of projections 79 are capable of clicking with the above-mentioned pair of slots 222b of the lamp indication unit 200.
  • the lamp indication unit 200 when the lamp indication unit 200 is adapted tothe main body 50 of the push-button switch, a pair of vertical lead wires 213b extending from the unit 200 are bent and welded to lead terminals 101, 104 extending from the main body 50 as shown in FIG. 14 so that a pair of lamps 211 is electrically connected to the pushbutton switch of the present invention.
  • the key top member 40 is fitted to the main body 50 by means of claws 41 and projectionsl70 as previously explained and, the push-button switch with lamp indication according to the present invention is completely assembled.
  • the lamp indication unit 200 is easily changeable.
  • lamp indication units having transparent, milky-white or other several kinds of colored socket portions 220, may be optionally prepared.
  • the push-button switch with multichoice colored lamp indication can be obtained and therefore, errors of operation by the operator can be eliminated.
  • a push-button switch comprising a housing provided with a support means for supporting a magnetic member at an upper portion of said support means;
  • a magnetic switching element fixedly positioned in said housing
  • a magnet mounted on said lower spring so as to move up and down in said housing while its upward movement is restrained by said support means and also, while being attracted to said support means in the ordinary'state; a pusher member capable of I moving up and down;
  • a second upper spring also mounted on said magnet at its one end and the other end positioned from said pusher member at a first predetermined pushed down displacement of said pusher member.
  • each of said left and right hand portions is provided with a first pair of mounting legs at the end thereof which are engageable with stepped portions formed in said housing by forcibly parting said first mounting legs, and a second pair of mounting legs in a form projecting from the middle of said first mounting legs which are to be used for fixing said push-button switch in a required position.

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US212096A 1970-12-29 1971-12-27 Push-button switch Expired - Lifetime US3701064A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP13333670U JPS518701Y1 (enrdf_load_stackoverflow) 1970-12-29 1970-12-29
JP12307070A JPS5030261B1 (enrdf_load_stackoverflow) 1970-12-30 1970-12-30
JP13473770U JPS518703Y1 (enrdf_load_stackoverflow) 1970-12-31 1970-12-31
JP12332670A JPS515714B1 (enrdf_load_stackoverflow) 1970-12-31 1970-12-31

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US3701064A true US3701064A (en) 1972-10-24

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US212096A Expired - Lifetime US3701064A (en) 1970-12-29 1971-12-27 Push-button switch

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DE (1) DE2165384C3 (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51136457U (enrdf_load_stackoverflow) * 1975-04-26 1976-11-04
JPS51136456U (enrdf_load_stackoverflow) * 1975-04-26 1976-11-04
JPS51137560U (enrdf_load_stackoverflow) * 1975-04-26 1976-11-06
US4453148A (en) * 1983-02-24 1984-06-05 Norakidze Georgy G Key switch
US4513271A (en) * 1982-07-16 1985-04-23 Minnesota Mining And Manufacturing Company Momentary contact magnetic switch
US4877927A (en) * 1989-04-06 1989-10-31 Hamlin Incorporated Extended dwell shock sensing device
US4968860A (en) * 1988-05-19 1990-11-06 Omron Tateisi Electronics Co. Light emitting type push button switch
US20040032311A1 (en) * 2002-05-31 2004-02-19 G.T. Development Corporation Switch assembly employing magnetic reed switches
WO2007119169A1 (en) * 2006-04-18 2007-10-25 Toyota Jidosha Kabushiki Kaisha Stop lamp switch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355366A1 (fr) * 1976-06-16 1978-01-13 Isostat Contacteur electrique miniature a bouton-poussoir
DE2856557A1 (de) * 1978-01-19 1979-07-26 Lucas Industries Ltd Schalteranordnung
DE102018106257A1 (de) * 2017-11-29 2019-05-29 Riedel Communications International GmbH Sprechstelle für ein Intercom-Netzwerk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310762A (en) * 1966-02-01 1967-03-21 Gen Electric Pushbutton snap action switch with permanent magnet latching means
US3465271A (en) * 1968-04-02 1969-09-02 Illinois Tool Works Magnetic switching device
US3644855A (en) * 1970-07-10 1972-02-22 Cherry Electrical Prod Keyboard reed switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310762A (en) * 1966-02-01 1967-03-21 Gen Electric Pushbutton snap action switch with permanent magnet latching means
US3465271A (en) * 1968-04-02 1969-09-02 Illinois Tool Works Magnetic switching device
US3644855A (en) * 1970-07-10 1972-02-22 Cherry Electrical Prod Keyboard reed switch

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51136457U (enrdf_load_stackoverflow) * 1975-04-26 1976-11-04
JPS51136456U (enrdf_load_stackoverflow) * 1975-04-26 1976-11-04
JPS51137560U (enrdf_load_stackoverflow) * 1975-04-26 1976-11-06
US4513271A (en) * 1982-07-16 1985-04-23 Minnesota Mining And Manufacturing Company Momentary contact magnetic switch
US4453148A (en) * 1983-02-24 1984-06-05 Norakidze Georgy G Key switch
US4968860A (en) * 1988-05-19 1990-11-06 Omron Tateisi Electronics Co. Light emitting type push button switch
US4877927A (en) * 1989-04-06 1989-10-31 Hamlin Incorporated Extended dwell shock sensing device
US20040032311A1 (en) * 2002-05-31 2004-02-19 G.T. Development Corporation Switch assembly employing magnetic reed switches
US7164335B2 (en) * 2002-05-31 2007-01-16 G.T. Development Corporation Switch assembly employing magnetic reed switches
WO2007119169A1 (en) * 2006-04-18 2007-10-25 Toyota Jidosha Kabushiki Kaisha Stop lamp switch
US20090237189A1 (en) * 2006-04-18 2009-09-24 Toyota Jidosha Kabushiki Kaisha Stop lamp switch
US7924125B2 (en) 2006-04-18 2011-04-12 Toyota Jidosha Kabushiki Kaisha Stop lamp switch

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Publication number Publication date
DE2165384C3 (de) 1974-09-05
DE2165384A1 (enrdf_load_stackoverflow) 1972-07-06
DE2165384B2 (de) 1974-02-07

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