1
Mervyn D G Randall: Hearing protectors. Racal Safety, Scrivener Clarke Scrivener and Johnson, February 25, 1986: US04572323 (114 worldwide citation)

A hearing protecting device comprises a shell defining a hollow enclosure, which may be provided with sound absorbing material, with an open mouth, which is, in use, placed over the ear. A resiliently deformable seal of sound absorbing material is provided along the periphery of the open mouth to se ...


2
Richard K O Connor: Breathing apparatus. Racal Safety, Scrivener Clarke Scrivener and Johnson, May 27, 1986: US04590951 (103 worldwide citation)

A power assisted respirator comprises a facepiece for covering at least the nose and mouth of the wearer which has an outlet provided with a one-way exhale valve which is openable to permit air to flow out of the facepiece when a predetermined pressure P is established within the facepiece. A pump u ...


3
Joseph R Hilton, John D Wood: Respirators. Racal Safety, Laubscher Philpitt & Laubscher, November 29, 1983: US04417575 (75 worldwide citation)

The present invention relates to a filtering facepiece made from flexible filtering sheet material.


4
Hilton Joseph Raymond: Improvements in and relating to power assisted air-purifying respirators.. Racal Safety, December 8, 1982: EP0066451-A1 (61 worldwide citation)

The device comprises an expandable chamber (13) having an outlet (23) for connection to a facepiece, for example a face mask (26) and an inlet (12) connected to pump means (2, 3, 4, 5) for drawing ambient air into the device through a filter (8) and pumping it into the chamber. In use the wearer of ...


5
David B Edwards: Breathing apparatus. Racal Safety, Jerry A Miller, November 20, 1990: US04971052 (56 worldwide citation)

A powered respirator comprises a motor-driven fan unit drawing air through an upstream filter for delivery to a facepiece. Operation of the fan motor is controlled in response to a differential pressure sensor tapped in across the fan unit so as to reduce the fan throughput in response to an increas ...


6
Joseph R Hilton: Respirators. Racal Safety, Laubscher Philpitt & Laubscher, December 13, 1983: US04419994 (56 worldwide citation)

The present invention relates to a respirator of the type called a filtering facepiece which is made from a flat pocket of flexible filtering sheet material having a generally tapering shape with an open edge at the larger end of the pocket and a closed end at the smaller end of the pocket. The clos ...


7
Hilton Joseph Raymond, Odell Raymond: Improvements in and relating to respirators.. Racal Safety, December 18, 1985: EP0164946-A2 (46 worldwide citation)

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 m ...


8
David B Edwards: Powered respirators. Racal Safety, Jerry A Miller, July 30, 1991: US05035239 (40 worldwide citation)

A powered respirator is provided with a device sensitive to the pressure within the respirator in the region of the user's face and adapted to sound a warning in the event that the sensed pressure goes below a selected threshold value. The device includes a flexible diaphragm exposed on its opposite ...


9
Improvements in and relating to breathing apparatus. Racal Safety, May 8, 1980: GB2032284-A (40 worldwide citation)

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 ...


10
Edwards David Brian: Breathing apparatus.. Racal Safety, January 31, 1990: EP0352938-A2 (29 worldwide citation)

A powered respirator comprises a motor-driven fan unit (11) drawing air through an upstream filter (16) for delivery to a facepiece (1). Operation of the fan motor (13) is controlled in response to a differential pressure sensor (17) tapped in across the fan unit (11) so as to reduce the fan through ...