US3251182A - Variable loudness alarm mechanism - Google Patents

Variable loudness alarm mechanism Download PDF

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Publication number
US3251182A
US3251182A US354228A US35422864A US3251182A US 3251182 A US3251182 A US 3251182A US 354228 A US354228 A US 354228A US 35422864 A US35422864 A US 35422864A US 3251182 A US3251182 A US 3251182A
Authority
US
United States
Prior art keywords
vibrator
spring
lever
alarm
arm
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
US354228A
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English (en)
Inventor
Chester B Marble
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.)
General Electric Co
Original Assignee
General Electric Co
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
Application filed by General Electric Co filed Critical General Electric Co
Priority to US354228A priority Critical patent/US3251182A/en
Priority to GB7713/65A priority patent/GB1028949A/en
Priority to ES0310411A priority patent/ES310411A1/es
Priority to NL6503536A priority patent/NL6503536A/xx
Priority to CH389865D priority patent/CH389865A4/xx
Priority to CH389865A priority patent/CH453217A/de
Application granted granted Critical
Publication of US3251182A publication Critical patent/US3251182A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/18—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by mechanically unlocking an electromechanical vibrator, e.g. actuated by the leakage flux of the electric driving means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B23/00—Arrangements producing acoustic signals at preselected times
    • G04B23/02—Alarm clocks
    • G04B23/10—Alarm clocks with presignal; with repeated signal; with changeable intensity of sound

Definitions

  • This invention relates to electric clocks including a vibrator alarm. More specifically, it relates to a mechanism for varying the loudness of an electromagnetic vibrator alarm.
  • the loudness of the alarm can be varied by varying the amplitude of oscillation of the free end of the vibrator, .or in other terms by varying the air gap between the free end of the vibrator and the stationary member which it engages. In prior art alarm intensity controls the amplitude of vibration has been limited by a cam which engages the vibrator or a member connected to the vibrator. Due
  • a relatively large portion of the cam movement is used in merely bringing the cam into engagement with the vibrator.
  • the use of a large portion of the cam movement for bringing the cam into engagement with the vibrator may result in insuiiicient or only very limited cam movement remaining for alarm intensity control.
  • variable loudness alarm mechanism which permits wide variation in the component dimensions and the assembly dimensions of the alarm and variable loudness mechanism, while at the same time providing accurate loudness control of the alarm.
  • variable loudness mechanism constructed in accordance with this invention not only provides accurate loudness control, but this control is of the vernier type, whereby easy adjustments can be. made in the alarm loudness.
  • a vibrator, spring, cam and lever mounted on the electric clock assembly in a predetermined spaced relationship.
  • a first arm of the spring which has'two arms, is positioned so that it may be brought into engagement with the vibrator near its free end.
  • the first arm is brought into engagement with and then displaces the free end of the vibrator.
  • the loudness of the alarm is adjusted by varying the position of the vibrator in response to movement of the spring arms and the lever by a cam engaging the lever.
  • the cam, lever, and spring arrangement provides a large mechanical ratio for multiplying the cam displacement to bring the first arm of the spring into engagement with the vibrator.
  • FIG. 1 is a rear perspective view of an electric clock incorporating the variable loudness alarm mechanism contemplated by this invention
  • FIG. 2 is a top view of the electric clock with the cover removed;
  • FIG. 3 is a rear view of the clock with the cover removed and portions broken away, and with thevariable loudness alarm mechanism in an operating position;
  • FIG. 4 is similar to FIG. 3, butwith the variable loudness alarm mechanism in an inoperative position;
  • FIG. 5 is an exploded view of the principal components of the variable loudness alarm mechanism and the vibrator of the alarm;
  • FIG. 6 is an enlarged view of the adjustment cam
  • FIG. 7 is a displacement chart for the variable loudness alarm mechanism.
  • an electric clock incorporating a pre ferred embodiment of the variable loudness alarm mechanism of this invention can best be seen by making ref: erence to FIG. 1. Shown protruding through the rear of the casing 10 is a time set knob 11, an alarm set knob 12, and an alarm on-ofi' lever 13. Also protruding from the rear of the housing is a coin slot control knob 14 which is used to adjust the variable loudness alarm mechanism of this invention.
  • the clock comprises a motor 15, a gear train 16 mounted between front plate 17 and back plate 18, and indicating hands 19.
  • the vibrator 20 is formed from a piece of steel.
  • the vibrator includes a major portion 22 and a flange 21 which is perpendicular to the major portion.
  • the flange is welded to the back plate 18 of the clock.
  • the free end 23 of the vibrator which engages a portion of the motor stator or a stationary member 25 to sound the alarm, is generally parallel to but offset from the major portion 22 of the vibrator.
  • the free end 23 of the vibrator includes a bent tab 24 which is provided for engagement with the on-oif lever 13.
  • the vibrator is mounted parallel to and in close proximity with the top portion or yoke of the motor stator 25. A portion of the alternating leakage flux which would normally pass through the air is shunted through the vibrator 20 thereby causing periodic attraction of the free end 23 of the vibrator to the motor stator 25. Periodic engagement of the free end 23 of the vibrator and motor stator 25 will cause sounding of the alarm.
  • FIG. 5 A lever 26 is pivotally supported by pin 27. Rotation of a cam 28 in an aperture 29 in the lever causes rotation of the lever about pin 27.
  • the free end of the lever includes a spring-engaging means 30 which may be a tab 31 bent at right angles to the lever with a hole 32 therein.
  • a sear spring 33 the convolute section 34 of which is placed over stud 33a, is provided for adjusting the position and stifiness of vibrator 20, in response to movement of lever 26.
  • the sear spring 33 p has arms of unequal length.
  • the shorter arm 35 is connected to the spring-engaging means 30 of the lever, while portion 37 of the longer arm 36 is positioned to engage the top surface of the vibrator 20.
  • Rotation of the cam 28 in a clockwise direction causes the lever 26' to be pivoted in a clockwise direction, thereby rotating the short arm 35 of sear spring 33 in a counterclockwise direction.
  • Counterclockwise rotation of the spring 33 brings portion 37 of the longer arm 36 of the spring into engagement with the top surface of the vibrator 20.
  • the lever system comprising the cam 28, the lever 26, and the sear spring 33 has a large mechanical ratio, such as 18 to 1.
  • This large ratio results from positioning the aperture 29 closer to pin 27 than is the springengaging means 30, and by making the spring arm 35 shorter than the spring arm 36. Slight rotation of the cam 28 will effect a relatively large movement of the portion 37 of the longer spring arm 36. Even though the mechanical tolerances of the dimensions and positions of the alarm mechanism components are large, it is possible to compensate for these large tolerances by bringing the portion 37 of the longer spring arm 36 into contact with the vibrator 20 by a very slight rotation of the control knob 14.
  • a variable loudness alarm mechanism for use with an electric clock comprising:
  • variable loudness alarm mechanism for use with an electric clock comprising:
  • variable loudness alarm mechanism defined in claim 2 wherein said first arm is longer than said second arm.
  • a variable loudness alarm mechanism for use with an electric clock comprising:
  • said longer arm being arranged to engage said' vibrator for urging said vibrator in one direction
  • variable loudness alarm mechanism defined in claim 4 wherein said aperture has a major dimension and a minor dimension, the major dimension extending generally in the direction of a line between the pivot point of said lever and the portion of said lever which engages said shorter arm of said spring.
  • variable loudness alarm mechanism defined in claim 4 wherein the cam is heart-shaped.
  • variable loudness alarm mechanism defined in claim 4 wherein said aperture is generally rectangular, the longer dimension of said aperture extending generally in the direction of a line between the pivot point of said lever and the portion of said lever which engages said shorter arm of said spring.
  • variable loudness alarm mechanism for use with an electric clock comprising:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromechanical Clocks (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
US354228A 1964-03-24 1964-03-24 Variable loudness alarm mechanism Expired - Lifetime US3251182A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US354228A US3251182A (en) 1964-03-24 1964-03-24 Variable loudness alarm mechanism
GB7713/65A GB1028949A (en) 1964-03-24 1965-02-23 Electric clock with variable loudness alarm mechanism
ES0310411A ES310411A1 (es) 1964-03-24 1965-03-11 Un mecanismo despertador de intensidad de sonido variable.
NL6503536A NL6503536A (de) 1964-03-24 1965-03-19
CH389865D CH389865A4 (de) 1964-03-24 1965-03-22
CH389865A CH453217A (de) 1964-03-24 1965-03-22 Alarmmechanismus mit regulierbarer Lautstärke für Zeitmesser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US354228A US3251182A (en) 1964-03-24 1964-03-24 Variable loudness alarm mechanism

Publications (1)

Publication Number Publication Date
US3251182A true US3251182A (en) 1966-05-17

Family

ID=23392391

Family Applications (1)

Application Number Title Priority Date Filing Date
US354228A Expired - Lifetime US3251182A (en) 1964-03-24 1964-03-24 Variable loudness alarm mechanism

Country Status (5)

Country Link
US (1) US3251182A (de)
CH (2) CH389865A4 (de)
ES (1) ES310411A1 (de)
GB (1) GB1028949A (de)
NL (1) NL6503536A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777701A (en) * 1972-05-05 1973-12-11 Ansonia Clock Co Inc Clock chime intensity control
US4203279A (en) * 1977-10-31 1980-05-20 Minoru Kamiya Timepiece which permits freely adjusting the level of sounds produced therein and given out thereof
US5502771A (en) * 1995-03-10 1996-03-26 Delfitz, Inc. Clock radio volume control appraratus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506379A (en) * 1946-04-27 1950-05-02 Warren Telechron Co Alarm intensity control
US2858029A (en) * 1956-04-10 1958-10-28 Rabinow Jacob Self-actuated automatic regulation of timepieces

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506379A (en) * 1946-04-27 1950-05-02 Warren Telechron Co Alarm intensity control
US2858029A (en) * 1956-04-10 1958-10-28 Rabinow Jacob Self-actuated automatic regulation of timepieces

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777701A (en) * 1972-05-05 1973-12-11 Ansonia Clock Co Inc Clock chime intensity control
US4203279A (en) * 1977-10-31 1980-05-20 Minoru Kamiya Timepiece which permits freely adjusting the level of sounds produced therein and given out thereof
US5502771A (en) * 1995-03-10 1996-03-26 Delfitz, Inc. Clock radio volume control appraratus

Also Published As

Publication number Publication date
CH389865A4 (de) 1967-11-30
ES310411A1 (es) 1965-07-01
GB1028949A (en) 1966-05-11
NL6503536A (de) 1965-09-27
CH453217A (de) 1967-11-30

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