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Improvements in and relating to breathing apparatus

GB2032284 25.09.1979 .

RACAL SAFETY LTD

A breathing apparatus comprises a housing, which may be a half face mask, a full face mask or a helmet (11). The housing is sealed to the wearer to define a substantially closed chamber surrounding the wearer's nose and mouth. Air is supplied to the helmet by a fan 16 and air exits from the chamber through an exhale valve 19 arranged to maintain a positive pressure within the chamber. To reduce the amount of air flowing through the filter 18, filtering air passing to the chamber, a detector 20, for example a pressure detector, is provided for detecting exhalation by the wearer and for reducing the air flow, for example by reducing the speed of the fan during at least part of the exhalation part of the breathing cycle of the wearer

Respirator

EP0094757 13.05. 1982 .

RACAL SAFETY LTD (GB)

The present invention relates to improvements in power assisted positive pressure respirators for use in contaminated atmospheres. The respirator comprises a facepiece 1 having an inlet 3 connected to a pump unit 5 for supplying air to the facepiece which has been filtered by filter means 11 connected to the pump unit inlet. The facepiece is also provided with an outlet provided witha one-way valve 2 which is biased to its closed position and is openable when a predetermined pressure above atmospheric pressure is established within the facepiece. To maximise use of the filter means 11, a one-way inlet valve 13 is provided intermediate the pump unit 5 and the facepiece 1, conveniently at the inlet to the facepiece, which is closed during exhalation by the wearer to thereby cause the pump to be placed in a condition in which, although it continues to operate, no or substantially no air is moved thereby, so that during this period, no or substantially no air is drawn through the filter means 11

Power assisted air-purifying respirators

US4430995 24.05.1982 .

HILTON JOSEPH R (GB)

The present invention relates to an improved air-purifying device for respirators of the positive pressure type. The device comprises an expandable chamber having an outlet for connection to a facepiece, for example, a face mask, and an inlet connected to a pump for drawing ambient air into the device through a filter and pumping it into the chamber. In use, the wearer of the face mask draws air from the chamber and that air is replenished by operation of the pump. Apparatus is provided for sensing the degree of expansion of the expandable chamber and is coupled with a device for varying the power supplied to the pump so that the pump means supplies only sufficient filtered air to maintain the chamber inflated. A bias is provided on the chamber, advantageously coupled with the sensing apparatus for maintaining a positive pressure in the chamber. An air-purifying device allows close control of the amount of air passing through the respirator so as to substantially reduce the amount of air which is filtered but unbreathed to extend the life of the filter

Improvements in and relating to respirators

EP0164946 06.06.1984 .

RACAL SAFETY LTD (GB)

The present invention relates to a pump module (14) for a powered air purifying respirator assembly including a facepiece (1) and a filter canister (32). The pump module (14) comprises a housing (15) having an air inlet (16) and an air outlet (17) and containing a fan (22) and motor (24). The pump module is designed to be mounted directly on an air purifying respirator facepiece (1) for powering the respirator, the module (14) being intended either to be interposed between the respirator facepiece (1) and a filter canister (32), which may otherwise be connected to the respirator, or to be connected to the inlet of the filter canister (32). The fan (22) may be either an axial fan or a centrifugal fan, and the fan and motor may be arranged relative to the housing inlet (16) and outlet (17) so asto minimise the extent to which the module projects from the facepiece and/or so that the motor will at least in part counterbalance the weight of the filter canister (32) about the axis of the pump module housing outlet (17)

Powered air-purifying respirator management system

US5950621 22.03.96 .

SAFETY EQUIPMENT SWEDEN AB (AU)

The present invention relates to a particular type of fan-forced positive pressure breathing apparatus, commonly known as Powered Air-Purifying Respirators (PAPRs). In particular the invention concerns monitoring the operation of such equipment. In a first aspect, the invention provides a powered air-purifying respirator which includes data collection means to enable the volume of air drawn through the filter to be determined. In another aspect, the invention comprises a management system for monitoring and analyzing operational data from at least one powered air-purifying respirator. The management system includes data collection means associated with each respirator to enable the volume of air drawn through that respirator's filter to be determined, and electronic data processing apparatus into which the data collected by the data collection means is uploaded for analysis. The data processing apparatus may be partly situated on-board each respirator in order to enable alarms to be given to the wearers at appropriate times. However, a remote computer system having data processing facilities will be able to store and subsequently display the data collected, as well as enabling more sophisticated analysis

FACE MASK WITH FAN ATTACHMENT

EP1183077 28.05.99 .

KIMBERLY CLARK CO (US)

A face mask is provided having a filter body sized to cover the nose and mouth of a wearer, a securing mechanism for holding the filter body in close fit with the wearer's face, and a fan attachment to enhance breathability and comfort of the mask. The fan is powered and configured with the exterior of the filter body to aid in drawing air through the filter media of the mask. The fan operates to draw warm, moist exhaled air from the interior volume of the mask to improve comfort, facilitate inhalation, and decrease fogging of any transparent portions of the mask or eye coverings. The fan may additionally operate to force cool, fresh air into the interior volume of the mask, also for the comfort of the wearer

Protective system for face and respiratory protection

US6250299 28.05.99 .

3M INNOVATIVE PROPERTIES CO (US)

The present invention provides a portable protective system for protecting a wearer, and for protecting the environment about the wearer. The protective system includes a face shield coupled with a head cradle for supporting the face shield on the wearer's head. The face shield and a wearer's face substantially define a breathing zone charged by a battery-powered blower carried on the head cradle. An bag-like inlet filter element encompasses the blower to provided filtered air to the breathing zone, and an outlet filter element is operably associated with the face shield

Method for breathing apparatus component coupling and apparatus for making the same

US6575165 03.08.2000 .

3M INNOVATIVE PROPERTIES CO (US)

The present invention relates to a fan-forced positive pressure breathing apparatus commonly known as a Powered Air Purifying Respirators (PAPR) system, and specifically concerns the connecting of the breathing components of such equipment. The invention is a method and apparatus for rapid engagement of PAPR breathing components (such as air supply lines and filter elements to a blower housing). The invention also provides for indicating and/or monitoring whether the relative components have been aligned and coupled in sealed engagement

Gas mask structure

US6435184 01.09.1999 .

HO TIEN LU (TW)

A gas mask structure including a rear cup body, two cell seats and a front cup body. The rear cup body has an opening facing backward. A top side of front face of the rear cup body is formed with an inlet and a guide way downward extends from the inlet. An inclined outlet is formed on a bottom side of front face of the rear cup body. A check membrane is disposed on front side of the outlet. The cell seats are respectively disposed on two sides of the bottom of the rear cup body for receiving cells therein to provide po-wer for a motor to drive a fan. The front cup body is fixedly disposed on lower side of the front end of the rear cup body. A filter body is posi-tio-ned in a fixing seat of the front cup body. A cover body is screwed on the fixing seat to fix the filter body therein and tightly hold a second filter body in front of the filter body. An inner face of the fixing seat is formed with a through hole in which the motor and the fan are disposed. The fan serves to generate air flow which is filtered through the second filter body and the filter body and then conducted into the guide way of the rear cup body

Method and system of calibrating air flow in a respirator system

US2003019494 20.02.2001 .

COOK DAVE (US); BENNETT MIKE R (US)

A method and apparatus for calibrating the air flow in a respirator system is provided. The method provides for the establishment of control set points in a true calibration protocol through the simple triggering of the microprocessor of a controller. When the trigger is initiated, the microprocessor engages and provides the logic for the calibration cycle. The calibration cycle proceeds until a second trigger terminates the process and establishes the control set points. The calibration sequence of the method relies only on an initiation and termination trigger that is facilitated by components integral to the apparatus

Personal powered air filtration, sterilization, and conditioning system

US2001050079 23.05.01 .

PIESINGER GREGORY HUBERT (US)

Hollow eyeglass frames are combined with a wearable distributed air pump to form a portable positive pressure powered air purifying delivery system for inconspicuously supplying respirable air to the nostrils of an individual. Ambient air is pressurized by combining the outputs of a plurality of piston compression tubes arranged and connected to form a thin flexible pump that can be worn around the waist. This pressurized air is passed through filter and conditioning modules to form respirable air, which is then piped to air inlet ports on the hollow frame eyeglass temples using small diameter tubing. Nose tubes on the hollow eyeglass frames near the nose inconspicuously direct the respirable air into the nostrils at a rate that exceeds the peak inhalation rate of the individual, thereby preventing the inhalation of unfiltered air