US3289129A - Push and pull key with reed contacts - Google Patents

Push and pull key with reed contacts Download PDF

Info

Publication number
US3289129A
US3289129A US393996A US39399664A US3289129A US 3289129 A US3289129 A US 3289129A US 393996 A US393996 A US 393996A US 39399664 A US39399664 A US 39399664A US 3289129 A US3289129 A US 3289129A
Authority
US
United States
Prior art keywords
container
reed
contact
permanent magnet
push
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
US393996A
Inventor
Gerhard Wessel
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 DEST16372U external-priority patent/DE1895214U/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3289129A publication Critical patent/US3289129A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/28—Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
    • H01H51/288—Freely suspended contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/16—Contacts characterised by the manner in which co-operating contacts engage by abutting by rolling; by wrapping; Roller or ball contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/64—Protective enclosures, baffle plates, or screens for contacts
    • H01H1/66—Contacts sealed in an evacuated or gas-filled envelope, e.g. magnetic dry-reed contacts
    • 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
    • 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
    • H01H36/0013—Permanent magnet actuating reed switches characterised by the co-operation between reed switch and permanent magnet; Magnetic circuits
    • 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
    • H01H36/008—Change of magnetic field wherein the magnet and switch are fixed, e.g. by shielding or relative movements of armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/60—Contact arrangements moving contact being rigidly combined with movable part of magnetic circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/28—Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"

Definitions

  • the invention relates to a push and pull key or button with reed contacts influenced at least by one permanent magnet'
  • push or pull keys known which use, instead of an open spring set pack, contacts enclosed in reed tubes which pull up by permanent magnet moved in the direction of the key pushing or pulling.
  • electromagnetic relay with an armature, preferably ball-shaped, freely movable in the air gap of the relay being under the influence of at least one permanent magnet.
  • the ferro-magnetic circuit of this relay consists of two straight rods, preferably with a round profile, arranged in series and limiting the operating air gap by their ends facing each other.
  • the permanent magnet or magnets are made as flat components, preferably of a rectangular cross-section arranged in a plane being in parallel to that plane in which the rods are located.
  • a reed contact is operated through an annular magnet poled in the axial direction.
  • Two reed contacts are operated by a rod-type magnet located between the two contacts and poled transverse to the keying direction.
  • Four reed contacts, star-arranged, are operated by a bar magnet arranged in the center between the four contacts, poled longitudinal to the keying direction.
  • FIGS. 1a and 1b show one reed contact to be operated by shifting an annular magnet
  • FIGS. 2a and 2b show two reed contacts located side by side, between which a bar magnet is arranged, poled transverse to the keying direction,
  • FIG-S. 3a and 312 show four reed contacts, star-arranged, having a bar magnet in their center poled in longitudinal direction,
  • FIG. 4A shows an enlarged view of a preferred embodiment of a reed contact
  • FIG. 4B shows a sectional view of the reed contact of FIG. 4A and includes a showing of an armature which has failed to make contact between the contact points,
  • FIG. 5A shows an enlarged view of a reed contact in accordance with an aspect of the invention.
  • FIG. 5B shows a sectional view of the embodiment of FIG. 5A with an armature in contact with contact points.
  • FIG. 1 shows a reed tube 1, preferably made. of glass, and accommodating on either front side two contact elements 2 and 3 respectively 4 and 5. Said contact elements are melted into the reed, tube at the front sides. Between the ends protruding into the reed tube 1 of the contact elements 2, 3, 4, 5 a freely movable armature 6 is inserted, having the shape of a ball. An annular magnet 7 is slid over the reed tube 1, poled in axial direction, the internal boring of said magnet has the shape of a longitudinal pole.
  • FIG. 2 shows a twin-arrangement of the above-described contacts. Between these two contacts, arranged side by side, a permanent magnet 8 is provided, poled transverse to the keying direction.
  • FIG. 3 shows an example in which four reed contacts are arranged star-shaped around a bar magnet 9 which is poled in the longitudinal direction towards the motion of the key.
  • FIGS. 4A, 4B, 5A and 5B show a cross-section through the center part of a reed contact according to FIG. 1 and in an enlarged scale.
  • annular magnet 7 For operating the ball-type armature 6 in the reed contact according to FIGS. 4A and 4B and annular magnet 7 with a round boring is used.
  • annular magnet 7 When the annular magnet 7 is applied to the reed contact tube 1 on one side a preferable magnetic point occurs for the ball-type armature 6, e.g. at the contact element 2. If, however, as shown in FIGS.
  • an annular magnet 7 provided with a longitudinal hole (as opposed to the round boring) is used to operate the ball-type armature 6 and when said annular magnet 7 takes a defined position towards the contact elements 2 to 4 of the reed contact no single magnetic point can occur for the balltype armature 6, e.g. at the contact pins 2 or 3; instead, the ball-type armature 6 bridges the contact elements 2 and 3 or sticks to both contact elements 2 and 3.
  • a push-pull key having a snap-action effect comprlsmg a container having walls the inner faces of which form a closed body
  • said movable armature being substantially spherical in form, large enough to bridge pairs of contact points and having a diameter substantially less than the spaces between the inner faces of the closed body, and
  • annular permanent magnet of substantially cylindrical external form with an internal bore forming an inner opening of elongated cross section at right angles to a long axis through its own center
  • said permanent magnet being linked magnetically to said movable armature so that motion of said permanent magnet will cause said movable armature to move quickly along and in contact with a selected portion of the inner faces of the closed body of the container to make and break circuits between the contact points at said one end of the container and to provide a snapping action relative to the contact points.
  • said permanent magnet is a bar magnet located along said common axis and poled in the longitudinal direction of keying movement.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Manufacture Of Switches (AREA)
  • Thermally Actuated Switches (AREA)
  • Push-Button Switches (AREA)
  • Linear Motors (AREA)

Description

Nov. 29, 1966 e. WESSEL 3,289,129
PUSH AND FULL KEY WITH REED CONTACTS Filed Sept. 2, 1964 2 Sheets-Sheet l Nov. 29, 1966 G. WESSEL 3,289,129
PUSH AND FULL KEY WITH REED CONTACTS Filed Sept. 2, 1964 2 SheetsSheet 2 7 7 w I I I ,///v l 336 i, s
H 45 F/"g; 55
United States Patent 3 289,129 PUSH AND PULL KE Y WITH REED CONTACTS Gerhard Wessel, Kornwestheim, Germany, assignor to International Standard Electric Corporation, New York, N.Y., a corporation of Delaware Filed Sept. 2, 1964, Ser. No. 393,996 Claims priority, application Germany, Sept. 21,1963, St 21,101 4 Claims. (Cl. 335-153) The invention relates to a push and pull key or button with reed contacts influenced at least by one permanent magnet' There are push or pull keys known which use, instead of an open spring set pack, contacts enclosed in reed tubes which pull up by permanent magnet moved in the direction of the key pushing or pulling. The hitherto known kind of reed contacts takes a lot of space in length and since the reed contacts in their longitudinal direction must be mounted in parallel to the direction of keying in order to obtain the most favorable effect the known push buttons with reed contacts are very expensive and cannot be kept very short and consequently small such as the different types operating with open contacts.
Furthermore, there are electromagnetic relay known with an armature, preferably ball-shaped, freely movable in the air gap of the relay being under the influence of at least one permanent magnet. The ferro-magnetic circuit of this relay consists of two straight rods, preferably with a round profile, arranged in series and limiting the operating air gap by their ends facing each other. The permanent magnet or magnets are made as flat components, preferably of a rectangular cross-section arranged in a plane being in parallel to that plane in which the rods are located. This arrangement of reed contacts known, used in the aforementioned relays, however, do not suit for push-buttons or pull-keys, because their construction, when using as individual contact in keys, represents no technical teaching and progress with regard to the size compared with the blade-type contacts known to the art.
It is the object of the invention to provide push and pull buttons with a kind of reed contacts which excel by particularly small dimensions, and to use for operating these contacts permanent magnets which are poled in such a way that no preferable magnetic flux can occur on one of the contact elements. This is achieved according to the invention that the individual reed contacts are pulled up with permanent magnets poled in different directions, depending on the number of contacts to be operated. A reed contact is operated through an annular magnet poled in the axial direction. Two reed contacts are operated by a rod-type magnet located between the two contacts and poled transverse to the keying direction. Four reed contacts, star-arranged, are operated by a bar magnet arranged in the center between the four contacts, poled longitudinal to the keying direction.
The invention is now in detail explained with the aid of the accompanying drawings, wherein:
FIGS. 1a and 1b show one reed contact to be operated by shifting an annular magnet,
FIGS. 2a and 2b show two reed contacts located side by side, between which a bar magnet is arranged, poled transverse to the keying direction,
FIG-S. 3a and 312 show four reed contacts, star-arranged, having a bar magnet in their center poled in longitudinal direction,
FIG. 4A shows an enlarged view of a preferred embodiment of a reed contact,
FIG. 4B shows a sectional view of the reed contact of FIG. 4A and includes a showing of an armature which has failed to make contact between the contact points,
3,289,129 Patented Nov. 29, 1966 FIG. 5A shows an enlarged view of a reed contact in accordance with an aspect of the invention, and
FIG. 5B shows a sectional view of the embodiment of FIG. 5A with an armature in contact with contact points. FIG. 1 shows a reed tube 1, preferably made. of glass, and accommodating on either front side two contact elements 2 and 3 respectively 4 and 5. Said contact elements are melted into the reed, tube at the front sides. Between the ends protruding into the reed tube 1 of the contact elements 2, 3, 4, 5 a freely movable armature 6 is inserted, having the shape of a ball. An annular magnet 7 is slid over the reed tube 1, poled in axial direction, the internal boring of said magnet has the shape of a longitudinal pole. By this it is warranted that the balltype armature 6 cannot stay at one contact element only in an intermediate position (FIG. 4), but both contact elements are practically simultaneously opened or closed, even at the slowest movement of the key (FIG. 5). This so-called snapping effect is very important for certain switching purposes.
FIG. 2 shows a twin-arrangement of the above-described contacts. Between these two contacts, arranged side by side, a permanent magnet 8 is provided, poled transverse to the keying direction.
FIG. 3 shows an example in which four reed contacts are arranged star-shaped around a bar magnet 9 which is poled in the longitudinal direction towards the motion of the key.
FIGS. 4A, 4B, 5A and 5B show a cross-section through the center part of a reed contact according to FIG. 1 and in an enlarged scale. For operating the ball-type armature 6 in the reed contact according to FIGS. 4A and 4B and annular magnet 7 with a round boring is used. When the annular magnet 7 is applied to the reed contact tube 1 on one side a preferable magnetic point occurs for the ball-type armature 6, e.g. at the contact element 2. If, however, as shown in FIGS. 5A and 5B, an annular magnet 7 provided with a longitudinal hole (as opposed to the round boring) is used to operate the ball-type armature 6 and when said annular magnet 7 takes a defined position towards the contact elements 2 to 4 of the reed contact no single magnetic point can occur for the balltype armature 6, e.g. at the contact pins 2 or 3; instead, the ball-type armature 6 bridges the contact elements 2 and 3 or sticks to both contact elements 2 and 3.
What is claimed is: 1. A push-pull key having a snap-action effect comprlsmg a container having walls the inner faces of which form a closed body,
reed contacts having pairs of contact points enclosed at one end of said container and connecting to terminate outside said container,
a movable armature in said container,
said movable armature being substantially spherical in form, large enough to bridge pairs of contact points and having a diameter substantially less than the spaces between the inner faces of the closed body, and
an annular permanent magnet of substantially cylindrical external form with an internal bore forming an inner opening of elongated cross section at right angles to a long axis through its own center,
said permanent magnet being linked magnetically to said movable armature so that motion of said permanent magnet will cause said movable armature to move quickly along and in contact with a selected portion of the inner faces of the closed body of the container to make and break circuits between the contact points at said one end of the container and to provide a snapping action relative to the contact points.
3 2. A push-pull key substantially as described in claim 1, in which 1 said permanent magnet is placed around said container and poled in an axial direction to further increase the snap-action effect. 3. A push-pull key substantially as described in claim 1 in which two containers and two independent sets of reed contacts are employed, and said permanent magnet is a bar magnet located between the containers and poled in a direction transverse to the keying direction. 4. A push-pull key substantially as claimed in claim 1 in which four containers and four independent sets of reed contacts are employed arranged substantially equidistantly and equiangularly about a common axis, and
said permanent magnet is a bar magnet located along said common axis and poled in the longitudinal direction of keying movement.
References Cited by the Examiner UNITED STATES PATENTS OTHER REFERENCES German application 1,116,815, November 1961.
' BERNARD A. GILHEANY, Primary Examiner.
J. J. BAKER, Assistant Examiner.

Claims (1)

1. A PUSH-PULL KEY HAVING A SNAP-ACTION EFFECT COMPRISING A CONTAINER HAVING WALLS THE INNER FACES OF WHICH FORM A CLOSED BODY, REED CONTACTS HAVING PAIRS OF CONTACT POINTS ENCLOSED AT ONE END OF SAID CONTAINER AND CONNECTING TO TERMINATE OUTSIDE SAID CONTAINER, A MOVABLE ARMATURE IN SAID CONTAINER, SAID MOVABLE ARMATURE BEING SUBSTANTIALLY SPHERICAL IN FORM, LARGE ENOUGH TO BRIDGE PAIRS OF CONTACT POINTS AND HAVING A DIAMETER SUBSTANTIALLY LESS THAN THE SPACES BETWEEN THE INNER FACES OF THE CLOSED BODY, AND AN ANNULAR PERMANENT MAGNET OF SUBSTANTIALLY CYLINDRICAL EXTERNAL FORM WITH AN INTERNAL BORE FORMING AN INNER OPENING OF ELONGATED CROSS SECTION AT RIGHT ANGLES TO A LONG AXIS THROUGH ITS OWN CENTER, SAID PERMANENT MAGNET BEING LINKED MAGNETICALLY TO SAID MOVABLE ARMATURE SO THAT MOTION OF SAID PERMANENT MAGNET WILL CAUSE SAID MOVABLE ARMATURE TO MOVE QUICKLY ALONG AND IN CONTACT WITH A SELECTED PORTION OF THE INNER FACES OF THE CLOSED BODY OF THE CONTAINER TO MAKE AND BREAK CIRCUITS BETWEEN THE CONTACT POINTS AT SAID ONE END OF THE CONTAINER AND TO PROVIDE A SNAPPING ACTION RELATIVE TO THE CONTACT POINTS.
US393996A 1962-10-20 1964-09-02 Push and pull key with reed contacts Expired - Lifetime US3289129A (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DEST19872A DE1219588B (en) 1962-10-20 1962-10-20 Protective tube contact with ball anchor
FR916162A FR1347245A (en) 1962-10-20 1962-11-21 Electromagnetic relays
DEST21064A DE1228328B (en) 1962-10-20 1963-09-12 Protective tube contact
DEST16372U DE1895214U (en) 1963-09-14 1963-09-14 RELAY WITH PROTECTIVE TUBE CONTACTS.
DEST21101A DE1300607B (en) 1962-10-20 1963-09-21 Push and pull button with protection tube anchor contact
DEST024201 1965-07-30

Publications (1)

Publication Number Publication Date
US3289129A true US3289129A (en) 1966-11-29

Family

ID=27544930

Family Applications (3)

Application Number Title Priority Date Filing Date
US368535A Expired - Lifetime US3261942A (en) 1962-10-20 1964-05-19 Reed contact with ball-shaped armature
US393996A Expired - Lifetime US3289129A (en) 1962-10-20 1964-09-02 Push and pull key with reed contacts
US563186A Expired - Lifetime US3356948A (en) 1962-10-20 1966-07-06 Electrical switching unit, controlled through permanent magnets with a reed contact, having a freely movable armature

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US368535A Expired - Lifetime US3261942A (en) 1962-10-20 1964-05-19 Reed contact with ball-shaped armature

Family Applications After (1)

Application Number Title Priority Date Filing Date
US563186A Expired - Lifetime US3356948A (en) 1962-10-20 1966-07-06 Electrical switching unit, controlled through permanent magnets with a reed contact, having a freely movable armature

Country Status (7)

Country Link
US (3) US3261942A (en)
BE (1) BE684763A (en)
CH (1) CH410113A (en)
DE (3) DE1219588B (en)
FR (5) FR1347245A (en)
GB (3) GB983615A (en)
NL (2) NL6410889A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356948A (en) * 1962-10-20 1967-12-05 Int Standard Electric Corp Electrical switching unit, controlled through permanent magnets with a reed contact, having a freely movable armature
US3458839A (en) * 1966-03-26 1969-07-29 Philips Corp Locking reed and ball switches and matrices

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187681B (en) * 1963-08-03 1965-02-25 Standard Elektrik Lorenz Ag Circuit arrangement for coupling arrangements in telecommunications, in particular telephone switchboards
DE1193109B (en) * 1964-05-20 1965-05-20 Standard Elektrik Lorenz Ag Asymmetrical direct current signal process via two-wire telecommunication lines, in particular telephone lines, and an arrangement for carrying out the process
DE1280412B (en) * 1965-05-20 1968-10-17 Standard Elektrik Lorenz Ag Bistable relay with protection tube armature contacts
US3361995A (en) * 1966-03-24 1968-01-02 Gen Equip & Mfg Magnetic proximity switch
DE1665441B1 (en) * 1966-08-18 1971-05-06 Ramstetter Otto Dipl Ing Magnetically operated electrical switch
JPS5228994B1 (en) * 1971-05-10 1977-07-29
US3768600A (en) * 1971-11-08 1973-10-30 Safety Skate Co Inc Silencer for boxcar retarders
CA1057801A (en) * 1975-12-25 1979-07-03 Yuji Hayashi Electromagnetically operated switch with a permanent magnet armature
FR2392483A1 (en) * 1977-05-25 1978-12-22 Renault MAGNETIC CONTROLLED CONTACTOR
FR2392485A1 (en) * 1977-05-27 1978-12-22 Orega Circuits & Commutation SWITCH WITH WET CONTACTS, AND MAGNETIC CONTROL
US4191935A (en) * 1978-02-10 1980-03-04 Bell Telephone Laboratories, Incorporated Twin path reed spring relay construction
US4481389A (en) * 1982-08-02 1984-11-06 Liquid Level Lectronics, Inc. Magnetic control device
FR2868497B1 (en) * 2004-04-02 2006-07-07 Sidel Sas VALVE COMPRISING A MAGNETIC CONTROL DEVICE
FR2992769B1 (en) * 2012-06-27 2014-08-08 Schneider Electric Ind Sas ELECTRIC CONTACT

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732464A (en) * 1956-01-24 Electrical contacting devices
US2999914A (en) * 1957-12-23 1961-09-12 Cons Electrodynamics Corp Magnetic switch
US3015707A (en) * 1957-11-19 1962-01-02 Bell Telephone Labor Inc Relay
US3103562A (en) * 1963-09-10 Magnetic ball switch for electric circuits

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1116815B (en) * 1961-11-09
US2715166A (en) * 1952-12-03 1955-08-09 Ibm Electromagnetic relay
US2859297A (en) * 1954-10-28 1958-11-04 Boeing Co Magnetically self-returning ball armature relays
US2892051A (en) * 1956-02-20 1959-06-23 Gems Company Flow indicator
DE1748664U (en) * 1956-11-23 1957-07-18 Siemens Ag ARRANGEMENT FOR ACTUATING PROTECTIVE TUBE CONTACTS.
GB910784A (en) * 1957-04-09 1962-11-21 Standard Telephones Cables Ltd Electromagnetically operable sealed switch
BE566587A (en) * 1957-04-09
US2935585A (en) * 1957-04-22 1960-05-03 Sigma Instruments Inc Polarized electromagnetic relay
US2980776A (en) * 1957-04-29 1961-04-18 Tann Corp Electric control device
US2995635A (en) * 1958-02-24 1961-08-08 Tann Corp Electric control device
DE1810380U (en) * 1959-09-23 1960-04-28 Siemens Ag PUSH BUTTON FOR ACTIVATING SEVERAL PROTECTIVE TUBE CONTACTS.
DE1835873U (en) * 1961-06-07 1961-08-03 Telefonbau & Normalzeit Gmbh KEYBOARD WITH PROTECTIVE TUBE CONTACTS.
DE1838753U (en) * 1961-07-21 1961-10-05 Telefonbau & Normalzeit Gmbh BUTTON WITH PROTECTIVE TUBE CONTACTS.
DE1219588B (en) * 1962-10-20 1966-06-23 Standard Elektrik Lorenz Ag Protective tube contact with ball anchor
DE1895214U (en) * 1963-09-14 1964-06-25 Standard Elektrik Lorenz Ag RELAY WITH PROTECTIVE TUBE CONTACTS.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732464A (en) * 1956-01-24 Electrical contacting devices
US3103562A (en) * 1963-09-10 Magnetic ball switch for electric circuits
US3015707A (en) * 1957-11-19 1962-01-02 Bell Telephone Labor Inc Relay
US2999914A (en) * 1957-12-23 1961-09-12 Cons Electrodynamics Corp Magnetic switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356948A (en) * 1962-10-20 1967-12-05 Int Standard Electric Corp Electrical switching unit, controlled through permanent magnets with a reed contact, having a freely movable armature
US3458839A (en) * 1966-03-26 1969-07-29 Philips Corp Locking reed and ball switches and matrices

Also Published As

Publication number Publication date
CH410113A (en) 1966-03-31
DE1228328B (en) 1966-11-10
GB1042810A (en) 1966-09-14
GB983615A (en) 1965-02-17
GB1111918A (en) 1968-05-01
BE684763A (en) 1967-01-30
US3261942A (en) 1966-07-19
FR1347245A (en) 1963-12-27
FR86428E (en) 1966-02-04
DE1219588B (en) 1966-06-23
DE1300607B (en) 1969-08-07
FR86415E (en) 1966-02-04
NL6410889A (en) 1965-03-22
US3356948A (en) 1967-12-05
FR1387074A (en) 1965-01-29
NL6610418A (en) 1967-01-31
FR90982E (en) 1968-03-22

Similar Documents

Publication Publication Date Title
US3289129A (en) Push and pull key with reed contacts
US3059075A (en) Electrical switching device
US2877315A (en) Electromagnetic relay
US3002067A (en) Magnetically biased switch
US3015707A (en) Relay
US2777922A (en) Electromagnetic switch
US3178532A (en) Electromagnetic relay with contact supported armature
US3030451A (en) Switching device
US2935585A (en) Polarized electromagnetic relay
US3488613A (en) Magnetic keyboard switch
US3904999A (en) Switching device
US3467923A (en) Miniature diaphragm relay
US3268840A (en) Magnetic switch contact assembly
US3525060A (en) Reed contacts operable by magnetic forces
US3458839A (en) Locking reed and ball switches and matrices
US3270302A (en) Relay with reed contacts
US3008021A (en) Electrically controlled switching device
US3188425A (en) Electromechanical switch for use as a crosspoint for conversation circuits
US3292121A (en) Bistable switching device
US3491317A (en) Magnetically operated reed switch
US3166652A (en) Magnetic reed switch with latching feature
US3235678A (en) Plunger type electrical switch with arcuate shaped contact means
US3188426A (en) Make before break magnetically-operated reed-type contact
US3204057A (en) Multicontact evacuated magnetic reed relay
US3533029A (en) Keyboard with reed contacts