GB2116430A - Massager with noise reduction - Google Patents

Massager with noise reduction Download PDF

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Publication number
GB2116430A
GB2116430A GB08206801A GB8206801A GB2116430A GB 2116430 A GB2116430 A GB 2116430A GB 08206801 A GB08206801 A GB 08206801A GB 8206801 A GB8206801 A GB 8206801A GB 2116430 A GB2116430 A GB 2116430A
Authority
GB
United Kingdom
Prior art keywords
case
motor
noise
vibration
massager
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.)
Granted
Application number
GB08206801A
Other versions
GB2116430B (en
Inventor
Douglas Alan Smith
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB08206801A priority Critical patent/GB2116430B/en
Publication of GB2116430A publication Critical patent/GB2116430A/en
Application granted granted Critical
Publication of GB2116430B publication Critical patent/GB2116430B/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H23/00—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms
    • A61H23/02—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms with electric or magnetic drive
    • A61H23/0254—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms with electric or magnetic drive with rotary motor
    • A61H23/0263—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms with electric or magnetic drive with rotary motor using rotating unbalanced masses

Abstract

The invention is related to battery driven, hand held massagers. The firm connection between the motor unit (B & C) and the case (G) is replaced with modified suspension, the whole forming a low-pass mechanical filter. The required low frequency vibrations are transmitted to the case and the higher frequency components are attenuated. The ear being more sensitive to these higher frequencies, the effect is a considerable reduction in the audible noise. <IMAGE>

Description

SPECIFICATION Massager with noise reduction The invention relates to the mechanical arrangements in battery driven, hand held massagers. The conventional massager has a thermoplastic case (G) containing batteries (A), and a motor (B) which drives a free eccentric cam (C). The motor is controlled by an on off switch an speed adjuster (H). The motor is fixed firmly to the case. The reaction of the motor to the rotation of the cam is transferred to the case to produce the required vibration. Due to the characteristics of the motor unit, the vibration in a fixed radial direction is not sinusoidal but of a complex waveform, giving rise to an unpleasant noise.
The invention reduces the audible noise by allowing the transmission of the low frequencies of vibration whilst attenuating the higher frequencies to which the ear is more sensitive.
This is carried out by any mechanical system interposed between the motor unit and the case, forming a low-passfiiter to the transmission of vibrations.
A simple embodiment of this principle is shown in the diagram. An elastic material (D) is used to suspend the motor unit in the case. The mass of the case together with that of the batteries held firmly by compressed foam plastic (E) and the elastic suspension form a resonant mechanical system. The wires (F) carrying current to the motor need to be flexible.
The resonant frequency (HZ) is made the same order as the motor speed (Revs/Sec). Above this frequency the velocity/frequency characteristic falls at a rate approaching 6db per octave. The amplitude of the vibrations is not appreciably affected and the noise is reduced to a slight hum.
Claim
The claim is that the noise emitted from a battery driven, hand held massager can be reduced to an acceptable volume by the introduction of a mechanical low-pass filter system to prevent the higher frequencies of vibration being transmitted from the motor unit to the case.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    SPECIFICATION Massager with noise reduction The invention relates to the mechanical arrangements in battery driven, hand held massagers. The conventional massager has a thermoplastic case (G) containing batteries (A), and a motor (B) which drives a free eccentric cam (C). The motor is controlled by an on off switch an speed adjuster (H). The motor is fixed firmly to the case. The reaction of the motor to the rotation of the cam is transferred to the case to produce the required vibration. Due to the characteristics of the motor unit, the vibration in a fixed radial direction is not sinusoidal but of a complex waveform, giving rise to an unpleasant noise.
    The invention reduces the audible noise by allowing the transmission of the low frequencies of vibration whilst attenuating the higher frequencies to which the ear is more sensitive.
    This is carried out by any mechanical system interposed between the motor unit and the case, forming a low-passfiiter to the transmission of vibrations.
    A simple embodiment of this principle is shown in the diagram. An elastic material (D) is used to suspend the motor unit in the case. The mass of the case together with that of the batteries held firmly by compressed foam plastic (E) and the elastic suspension form a resonant mechanical system. The wires (F) carrying current to the motor need to be flexible.
    The resonant frequency (HZ) is made the same order as the motor speed (Revs/Sec). Above this frequency the velocity/frequency characteristic falls at a rate approaching 6db per octave. The amplitude of the vibrations is not appreciably affected and the noise is reduced to a slight hum.
    Claim
    The claim is that the noise emitted from a battery driven, hand held massager can be reduced to an acceptable volume by the introduction of a mechanical low-pass filter system to prevent the higher frequencies of vibration being transmitted from the motor unit to the case.
GB08206801A 1982-03-09 1982-03-09 Massager with noise reduction Expired GB2116430B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08206801A GB2116430B (en) 1982-03-09 1982-03-09 Massager with noise reduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08206801A GB2116430B (en) 1982-03-09 1982-03-09 Massager with noise reduction

Publications (2)

Publication Number Publication Date
GB2116430A true GB2116430A (en) 1983-09-28
GB2116430B GB2116430B (en) 1985-04-03

Family

ID=10528870

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08206801A Expired GB2116430B (en) 1982-03-09 1982-03-09 Massager with noise reduction

Country Status (1)

Country Link
GB (1) GB2116430B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878489A (en) * 1988-07-11 1989-11-07 Tensho Electric Industrial Co., Ltd. Massage unit
US5573499A (en) * 1991-11-13 1996-11-12 Health Devices Corporation Vibrator system
US20090247915A1 (en) * 2004-11-02 2009-10-01 Ethan Frederic Imboden Personal vibrator with replaceable motor
EP2130525A1 (en) * 2008-06-06 2009-12-09 Koninklijke Philips Electronics N.V. A massage device, a flexible skin covering said massage device and a method for reducing audible noise of a massage device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4878489A (en) * 1988-07-11 1989-11-07 Tensho Electric Industrial Co., Ltd. Massage unit
US5573499A (en) * 1991-11-13 1996-11-12 Health Devices Corporation Vibrator system
US20090247915A1 (en) * 2004-11-02 2009-10-01 Ethan Frederic Imboden Personal vibrator with replaceable motor
EP2130525A1 (en) * 2008-06-06 2009-12-09 Koninklijke Philips Electronics N.V. A massage device, a flexible skin covering said massage device and a method for reducing audible noise of a massage device
WO2009147618A1 (en) * 2008-06-06 2009-12-10 Koninklijke Philips Electronics N.V. A massage device, a flexible skin covering said massage device and a method for reducing audible noise of a massage device

Also Published As

Publication number Publication date
GB2116430B (en) 1985-04-03

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Legal Events

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PCNP Patent ceased through non-payment of renewal fee