GB817289A - Fluid pressure warning device - Google Patents

Fluid pressure warning device

Info

Publication number
GB817289A
GB817289A GB11703/56A GB1170356A GB817289A GB 817289 A GB817289 A GB 817289A GB 11703/56 A GB11703/56 A GB 11703/56A GB 1170356 A GB1170356 A GB 1170356A GB 817289 A GB817289 A GB 817289A
Authority
GB
United Kingdom
Prior art keywords
bellows
plunger
gas
control pressure
bore
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
Application number
GB11703/56A
Inventor
Frank Enstone
Douglas Charles 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.)
BOC Group Ltd
Original Assignee
British Oxigen Ltd
Filing date
Publication date
Application filed by British Oxigen Ltd filed Critical British Oxigen Ltd
Publication of GB817289A publication Critical patent/GB817289A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B9/00—Component parts for respiratory or breathing apparatus
    • A62B9/006—Indicators or warning devices, e.g. of low pressure, contamination
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0051—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes with alarm devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Emergency Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • Anesthesiology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

817,289. Respiratory apparatus. BRITISH OXYGEN CO. Ltd. April 5, 1957 [April 17, 1956], No. 11703/56. Class 81 (2). [Also in Groups XIX and XXIX] A warning device for indicating fall in pressure in one of two or more gases used in respiratory apparatus comprises signalling means operated by the flow of a first gas and valve means responsive to a control pressure derived from the flow of a second gas, the valve means cutting off the flow of the first gas to prevent operation of the signalling means when the control pressure due to the second gas exceeds a predetermined value. The bellows 10, Fig. 1, is fixed to one end 12 of a housing 11 and is connected to a supply of oxygen through a tube 13. A rubber tube 18 is arranged in a second housing 17 so that it is at right angles to the axis of the bellows 10 and receives anaesthetic gas. If the pressure of oxygen in the bellows 10 exceeds a predetermined amount, the plunger 16 secured to the free end of the bellows 10 is moved towards an abutment 20 which projects into the second housing 17, and flattens the rubber tube 18, thus preventing anaesthetic gas reaching a whistle 19. If the control pressure in the bellows falls below a predetermined amount the bellows 10 contracts withdrawing the plunger 16 so that anaesthetic gas reaches the whistle 19 and an audible warning is given. In an alternative construction, the free end of the bellows 23, Fig. 3, connected with the oxygen supply carries, a plunger 28 which slides in a first bore 29 in a valve plate 30. Normally anaesthetic gas, connected with a second bore 31 in the valve plate 30 which intersects the first bore 29 at right angles, is prevented by the plunger 28 from flowing to a housing 36 containing a reed 34. If the control pressure in the bellows 23 falls below a predetermined amount a circumferential groove 38 in the plunger 28 registers with the second bore 31 in the valve plate to permit the flow of anaesthetic gas to the reed 34 to give an audible warning. The plunger 28 permanently engages spring contacts 45, 46 in an electric circuit which includes a lamp 57 and a battery 54. Where the control pressure in the bellows 23 exceeds a predetermined amount of insulating portion 40 of the plunger 28 connects the spring contacts so that the circuit is broken. If the control pressure in the bellows 23 falls so that the audible warning is given, a conducting portion 41 of the plunger 28 completes the electric circuit and the lamp 57 lights to give a visible warning.
GB11703/56A 1956-04-17 Fluid pressure warning device Expired GB817289A (en)

Publications (1)

Publication Number Publication Date
GB817289A true GB817289A (en) 1959-07-29

Family

ID=1711388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11703/56A Expired GB817289A (en) 1956-04-17 Fluid pressure warning device

Country Status (1)

Country Link
GB (1) GB817289A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188999A (en) * 1963-03-11 1965-06-15 Sonitrol Corp Jet resonator
FR2601877A1 (en) * 1986-07-24 1988-01-29 Drager Sa Alarm system with pneumatic control for pneumatic respirator
EP0309633A1 (en) * 1987-09-30 1989-04-05 Drager Alarm system with pneumatic control for a pneumatic respirator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188999A (en) * 1963-03-11 1965-06-15 Sonitrol Corp Jet resonator
FR2601877A1 (en) * 1986-07-24 1988-01-29 Drager Sa Alarm system with pneumatic control for pneumatic respirator
EP0309633A1 (en) * 1987-09-30 1989-04-05 Drager Alarm system with pneumatic control for a pneumatic respirator

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