US2672765A - Lever key - Google Patents

Lever key Download PDF

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Publication number
US2672765A
US2672765A US206282A US20628251A US2672765A US 2672765 A US2672765 A US 2672765A US 206282 A US206282 A US 206282A US 20628251 A US20628251 A US 20628251A US 2672765 A US2672765 A US 2672765A
Authority
US
United States
Prior art keywords
spring
key
cam
detent
springs
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
US206282A
Other languages
English (en)
Inventor
Duncan N Macdonald
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
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 to BE506996D priority Critical patent/BE506996A/xx
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Priority to US206282A priority patent/US2672765A/en
Priority to GB23484/51A priority patent/GB708451A/en
Priority to FR1044080D priority patent/FR1044080A/fr
Priority to DEA17940A priority patent/DE953093C/de
Application granted granted Critical
Publication of US2672765A publication Critical patent/US2672765A/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
    • 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
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
    • H01H1/28—Assembly of three or more contact-supporting spring blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B2700/00—Combustion apparatus for solid fuel
    • F23B2700/011—Combustion apparatus for solid fuel with fuel shaft for steam boilers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20636—Detents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20924—Controller checks

Definitions

  • This invention relates to telephone keys, and more particularly to what are known as ringi and listening keys.
  • the object of this invention is to provide a positive stop for a lever key at its center position in order to prevent overthrow of the key when it is suddenly released from one of its extreme positions, either listening or ringing, and the inadvertent disturbance of the circuits corresponding to the opposite position.
  • a feature of my invention is the provision of a notched cam body which operates, as a positive stop for the key.
  • Another feature of my invention is the provision of a weighted cantilever detent spring in the spring pileup which is deflected by the initial operation of the key in one direction and upon the release of the key suddenly, either by snap action or quick operation, from that direction, the detent spring restores beyond its normal position and engages the notches in the cam body and acts as a positive stop for the key, thus preventing the objectionable disturbance of the opposite position circuits.
  • Another feature of my invention is the provision of a spring of the above description in which the mass of the spring weight is of such a value that the key may be operated from one extreme position to the other in a deliberate manner without the positive stop action of the detent spring taking place.
  • the detent prevents overthrow but does not prevent normal operation of the key.
  • Fig. 1 is a side elevation of the inventionwith the cam in its normal position.
  • Fig. 2 is a right end view of Fig. 1.
  • Fig. 3 is a partial side elevation of the invention with the cam in one of its extreme positions, either ringing or listening.
  • Fig. 4 is a partial side elevation of the invention with the cam almost restored to normal with the detent spring past normal and in engagement with the notch in the cam body.
  • the preferred form of my key comprises two T-shaped frame members 2, suitably fastened to an escutcheon plate I at one end, extending downward in a parallel relationship and clamped in a suitable manner by two L-shaped clamps l1 and a spacer, not shown.
  • Mounted upon the clamps I1 and extending right and left from the frame members 2 are a plurality of springs approximately parellel to the fram members 2, suitably insulated from each other and the frame members in an arrangement usually known as a spring pileup.
  • a cam 3 which also extends through a slot in the escutcheon plate I.
  • a handle or grip 4 of suitable insulating material.
  • a pair of cam rollers 5 mounted rotatably on the cam body, one on either side thereof. The cam rollers 5 are acted upon by the cam follower springs 8 so as to hold the handle 4 in a vertical central position, which is the normal position of the key. In this normal position the detent spring I0 is also in its normal position at rest just beyond the circumference of the cam body.
  • the buffer or bushing 9 afiixed to the follower spring 8 does not at this time rest against the surface of the detent spring l0 but a clearance exists between these two members.
  • Bushing I2 ailixed to lever spring l3 rests lightly against the detent spring I0 but does not diminish the required clearance.
  • Slightly below the horizonal diameter of the cam body portion and at the circumference thereof are two notches 1, suitably hardened, of a depth slightly greater than the guage of the detent spring. In this normal position of the key certain electrical circuits exist through the made contacts on the lever and contact springs, and certain other electrical circuits are incomplete due to the open condition of other contacts on these springs.
  • Deliberate operation of the key from one extreme position to the other extreme position does not cause the detent spring iii to engage the-cam body 5 and prevent this operation.
  • the detent spring [0 does not gather the momentum necessary to cause it to travel beyond its normal position under the influence of the weight ,and it merely returns. to its normal position where it clears the cam body 3. The handle then may continue in its travel to the opposite extreme position.
  • a frame a notched cam pivotally mounted on said frame, a cam. roller rotatably mounted on said cam, operating and releasing means projecting from said earn, a plurality of springs mounted on said frame. in a stratified arrangement, a follower spring in said arrangement resting against said cam roller, said follower spring being displaced upon operation of said operating means, a detent spring in said arrangement normally out of the path of said notch, a weight on the free end of said detent spring, means for displacing said detent spring upon operation of said operating means, locking means including said cam roller and said follower spring for maintaining said cam in an extreme operated position, said releasing means operating to release said locking means, said follower spring operating against said cam roller to return said cam toward its original position, said detent spring operating under the influence of said weight thereon to return past its original position to engage said notch on said cam and arrest the motion thereof, said detent spring disengaging said notch and moving 0 t of the path thereof under the influence of the internal tension there
  • a key switch the combination with anoperating device having notches thereon, of a pair of cantilever detent springs controlled thereby each having a normal and an operated position, said device having means for deflecting one of said detent springs upon movement of said key from oneposition to another, each of saiddetent springs having a weight mounted on the free end thereof, each of said detent springs operating under the influence of said weight thereon to return past its normal position to engage one of the notches on said notchedd'evice upon sudden return of said notched device from the-oppositepositions to which it has beenmoved by said key, each spring returning directlyto its normal position of non-engagement upon the slow return of said key from opposite positions without engaging said notched device.

Landscapes

  • Mechanical Control Devices (AREA)
  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)
US206282A 1951-01-16 1951-01-16 Lever key Expired - Lifetime US2672765A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE506996D BE506996A (en(2012)) 1951-01-16
US206282A US2672765A (en) 1951-01-16 1951-01-16 Lever key
GB23484/51A GB708451A (en) 1951-01-16 1951-10-09 Telephone key and like switches
FR1044080D FR1044080A (fr) 1951-01-16 1951-10-23 Perfectionnements apportés aux appareils de combustion pour combustibles solides
DEA17940A DE953093C (de) 1951-01-16 1953-05-05 Kippschalter, insbesondere fuer Fernsprechanlagen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US206282A US2672765A (en) 1951-01-16 1951-01-16 Lever key

Publications (1)

Publication Number Publication Date
US2672765A true US2672765A (en) 1954-03-23

Family

ID=22765708

Family Applications (1)

Application Number Title Priority Date Filing Date
US206282A Expired - Lifetime US2672765A (en) 1951-01-16 1951-01-16 Lever key

Country Status (4)

Country Link
US (1) US2672765A (en(2012))
BE (1) BE506996A (en(2012))
FR (1) FR1044080A (en(2012))
GB (1) GB708451A (en(2012))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875639A (en) * 1954-01-15 1959-03-03 Bell Telephone Labor Inc Switching device mechanism
US2943158A (en) * 1958-05-22 1960-06-28 Northern Electric Co Two way lever type telephone key
US3076063A (en) * 1960-03-24 1963-01-29 Gen Dynamics Corp Switching keys with cam follower means
DE1153033B (de) * 1955-10-24 1963-08-22 Adlerwerke Kleyer Ag H Vorrichtung an Buchungsmaschinen zum selbsttaetigen Einstellen von auf der vorderen Seite der Schreibwalze einzufuehrenden Schreibblaettern auf die jeweils zu beschreibende Zeile mittels Foerderwalzen
US3317682A (en) * 1965-10-14 1967-05-02 Automatic Elect Lab Switching device with sensor for proximity switch
US3543602A (en) * 1968-11-25 1970-12-01 Robert D Riedle Lever positioning apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1508798A (en) * 1920-08-23 1924-09-16 Kellogg Switchboard & Supply Key
US2427187A (en) * 1945-05-10 1947-09-09 Kellogg Switchboard & Supply Listening and ringing key for telephone switchboards

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1508798A (en) * 1920-08-23 1924-09-16 Kellogg Switchboard & Supply Key
US2427187A (en) * 1945-05-10 1947-09-09 Kellogg Switchboard & Supply Listening and ringing key for telephone switchboards

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875639A (en) * 1954-01-15 1959-03-03 Bell Telephone Labor Inc Switching device mechanism
DE1153033B (de) * 1955-10-24 1963-08-22 Adlerwerke Kleyer Ag H Vorrichtung an Buchungsmaschinen zum selbsttaetigen Einstellen von auf der vorderen Seite der Schreibwalze einzufuehrenden Schreibblaettern auf die jeweils zu beschreibende Zeile mittels Foerderwalzen
US2943158A (en) * 1958-05-22 1960-06-28 Northern Electric Co Two way lever type telephone key
US3076063A (en) * 1960-03-24 1963-01-29 Gen Dynamics Corp Switching keys with cam follower means
US3317682A (en) * 1965-10-14 1967-05-02 Automatic Elect Lab Switching device with sensor for proximity switch
US3543602A (en) * 1968-11-25 1970-12-01 Robert D Riedle Lever positioning apparatus

Also Published As

Publication number Publication date
FR1044080A (fr) 1953-11-13
BE506996A (en(2012))
GB708451A (en) 1954-05-05

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