GB2222297A - Improvements to gas powered alarm device - Google Patents

Improvements to gas powered alarm device Download PDF

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Publication number
GB2222297A
GB2222297A GB8812749A GB8812749A GB2222297A GB 2222297 A GB2222297 A GB 2222297A GB 8812749 A GB8812749 A GB 8812749A GB 8812749 A GB8812749 A GB 8812749A GB 2222297 A GB2222297 A GB 2222297A
Authority
GB
United Kingdom
Prior art keywords
gas
vibratory member
alarm
cap
container
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.)
Withdrawn
Application number
GB8812749A
Other versions
GB8812749D0 (en
Inventor
John Alfred Worthington
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 GB8812749A priority Critical patent/GB2222297A/en
Publication of GB8812749D0 publication Critical patent/GB8812749D0/en
Publication of GB2222297A publication Critical patent/GB2222297A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • G10K9/20—Sounding members
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/02—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated
    • G10K9/04—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers driven by gas; e.g. suction operated by compressed gases, e.g. compressed air

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

An actuator body 4 is mounted onto a tube 8 of a gas container, which body when displaced vertically downwards permits the passage of gas from the container into an annular chamber 9, from where it passes across the face of a vibratory member 1. The vibratory member is secured in position by a retaining plug 3 which exerts a force onto a circular seal 2 and thence onto thevibratory member 1 and the resultant assembly is housed in a cap 10. The cap obtains guidance on the container and has projections 11 on the inner wall which enable it to lock down onto the container in order to give a continuous blast. Walls 5 and 13 of the actuator body 4 and the retaining plug 3 are of frusto-conical form. <IMAGE>

Description

IMPROVEMENTS TO GAS POWERED ALARM DEVICE This invention relates to a personal alarm device, of the kind which can be carried in a pocket or handbag.
Such alarm devices have a vibratory member in an alarm actuator which is powered by compressed gas from a container holding compressed or liquified gas.
The vibratory member of such alarm devices has normally taken the form of a thin flat disc which can present problems during manufacture when the tension across the thin disc may vary within a production batch for a variety of reasons.
An object of the invention is to provide a new form of vibratory member, which overcomes this problem.
According to the invention there is provided a gas powered alarm device in which a member vibrates against an orifice during gas release, wherein the vibratory member is in the form of a disc which is held peripherally by a circular seal against conical surfaces and so creates tension across the face of the vibratory member.
An embodiment of the invention is illustrated, by way of example in the accompanying drawing, which is a sectional view through a gas powered personal alarm.
The vibratory member 1 which is a thin disc free of any sealant coating, is passed down the housing bore 12 and is supported by the cylindrical edge 7 of an orifice 6.
A resilient sealing ring 2 is then pushed to the midpoint along the length of the housing bore 12 and the retaining plug 3 is inserted into the housing bore 12 under a controlled force to a point where it compresses the sealing ring 2 between the conical faces 5 and 13, having also trapped the periphery of the vibratory member 1 against the conical face 5 of the housing 4, at which point the retaining plug 3 is permanently swaged into position and the compressed sealing ring 2 prevents the passage of gas into chamber 14.
Gas is released up a tube 8 from a container, not shown, which is housed in the cap 10 by depressing the top of the cap of the alarm. The pressurised gas flows around the edge 7, into the annular chamber 9 and causes the tensioned face of the vibratory member 1 to vibrate so that a loud screech alarm note is emitted from the orifice 6.
The actuator assembly can be released to stop the alarm, or can be locked down onto the container, by the use of greater pressure which locks the cap 10 onto projections 11. This enables a continuous alarm note to be produced in an emergency, which will continue until the gas supply fails.

Claims (5)

Claims
1. A gas powered alarm device in which a member vibrates against an orifice during gas release, wherein the vibratory member is in the form of a disc which is held peripherally by a circular seal against conical surfaces and so creates tension across the face of the vibratory member.
2. An alarm as claimed in Claim 1, wherein the vibratory member is in the form of a clean disc without a sealant coating which could otherwise be affected by the gas propellant formulation such as those regarded as non-hazardous to the ozone layer.
3. An alarm as claimed in Claim 1 or Claim 2, wherein a resilient sealing ring is compressed, between the retaining plug and the vibratory member, which obviates the need to precisely position the retaining plug thus permitting greater manufacturing tolerances.
4. An alarm as claimed in any one of the preceding Claims, wherein the vibratory member is mounted in a cap which has projections on its inner wall so as to enable the cap to be locked down onto a gas cylinder and release gas against the vibratory member to create a continuous alarm note.
5. A gas powered alarm device substantially as herein described with reference to the accompanying drawing.
GB8812749A 1988-05-28 1988-05-28 Improvements to gas powered alarm device Withdrawn GB2222297A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8812749A GB2222297A (en) 1988-05-28 1988-05-28 Improvements to gas powered alarm device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8812749A GB2222297A (en) 1988-05-28 1988-05-28 Improvements to gas powered alarm device

Publications (2)

Publication Number Publication Date
GB8812749D0 GB8812749D0 (en) 1988-06-29
GB2222297A true GB2222297A (en) 1990-02-28

Family

ID=10637750

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8812749A Withdrawn GB2222297A (en) 1988-05-28 1988-05-28 Improvements to gas powered alarm device

Country Status (1)

Country Link
GB (1) GB2222297A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB228865A (en) * 1924-02-08 1925-06-04 Ci Ind Et Commerciale Du Cycle Et De Lautomobile Improvements in motor horns
GB263624A (en) * 1926-01-01 1927-01-06 Ci Ind Et Commerciale Du Cycle Et De Lautomobile Improvements in motor horns
GB1115857A (en) * 1965-08-24 1968-05-29 Kockums Mekaniska Verkstads Ab Improvements in or relating to sound generator employing gaseous operating fluid
US4171678A (en) * 1977-07-22 1979-10-23 Midland-Ross Corporation Air horn
GB2127202A (en) * 1982-08-31 1984-04-04 Strongman Security Products Li Alarm device
GB2190230A (en) * 1986-05-08 1987-11-11 John Alfred Worthington Improvements to gas powered alarm device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB228865A (en) * 1924-02-08 1925-06-04 Ci Ind Et Commerciale Du Cycle Et De Lautomobile Improvements in motor horns
GB263624A (en) * 1926-01-01 1927-01-06 Ci Ind Et Commerciale Du Cycle Et De Lautomobile Improvements in motor horns
GB1115857A (en) * 1965-08-24 1968-05-29 Kockums Mekaniska Verkstads Ab Improvements in or relating to sound generator employing gaseous operating fluid
US4171678A (en) * 1977-07-22 1979-10-23 Midland-Ross Corporation Air horn
GB2127202A (en) * 1982-08-31 1984-04-04 Strongman Security Products Li Alarm device
GB2190230A (en) * 1986-05-08 1987-11-11 John Alfred Worthington Improvements to gas powered alarm device

Also Published As

Publication number Publication date
GB8812749D0 (en) 1988-06-29

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)