Patent Publication Number: US-4549542-A

Title: Multiple-effect respirator

Description:
BACKGROUND OF THE INVENTION 
     Conventional oxygen-generating apparatuses or air line respirators are quite complex in construction and are expensive especially for the poorer users. Since there is no effective forced draft provided in a conventional respirator to release the exhaled air, the ventilation of such a conventional respirator is thus poorer. 
     The present inventor has found this defect of conventional respirators and invented the present multiple-effect respirator to overcome this defect. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a respirator comprising a driving motor, a supplying air fan, an exhausting air fan, two ventilating air fans and a mask formed in a facepiece wherein the supplying air fan is driven by the motor to direct fresh air into the mask, the exhausting fan is also driven by the motor to discharge the waste air accumulated in the mask for providing comfortable breathing for the wearer and the two ventilating fans are driven by motor to suck in fresh air and direct it into the helmet for comforting wearer&#39;s head. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an illustration showing the present invention mounted on wearer&#39;s helmet. 
     FIG. 2 is a partial sectional drawing of the present invention. 
     FIG. 3 is an illustration taken from direction AA of FIG. 1 in accordance with the present invention. 
     FIG. 4 is a partial sectional illustration showing another preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION 
     As shown in FIGS. 1, 2 and 3, the present invention comprises a driving motor 1, a supplying air fan 2, an exhausting air fan 3, two ventilating air fans 4 and a facepiece 5 having a mask 51 which is formed in facepiece 5 to correspond with the wearer&#39;s nose and mouth. All fans 2, 3, 4 are respectively fixed on a shaft 11 of driving motor 1. All fans and the motor are fixed in a housing C mounted on the helmet H. The supplying air fan 2 and a ventilating air fan 4 are positioned on one side of motor 1 and the exhausting air fan 3 and the other ventilating air fan 4 are positioned on the opposite side of motor 1. Both ventilating air fans 4 are separated by a partition plate 40 centrally formed on motor 1. Supplying fan 2 is separated from the one ventilating fan 4 by a partition plate 41. However, exhausting fan 3 is separated from the other ventilating fan 4 by another partition plate 41a opposite to partition plate 41. An air entrance port 21 fluidically communicated with supplying fan 2 which has a thread 211 for connecting a canister 22 for air filtration. In front of fan 2, there is also provided a louver 24 for adjusting the opening of air entrance by an adjusting knob 23 (not shown), and is provided with a filter 25 for dust screening. An air delivery tube 26 is provided to direct the air blown by supplying fan 2 into mask 51 formed in facepiece 5. Tube 26 is formed with an expansion portion 27 within mask 51. A perforated cap 28 is provided on expansion portion 27 to diffuse air to the wearer. 
     Mask 51 is provided with a partition plate 54 to form an upper chamber 52 and a lower chamber 55. Partition plate 54 is formed with several perforations 541. Air delivery tube 26 is led into upper chamber 52 to fluidically communicate with the wearer&#39;s nose. A cassette 53 filled with stimulant or air refreshing agent is formed on the upper chamber 52 to comfort the wearer while breathing. An air discharge tube 31 is provided which fluidically communicates through outlet port 32 with the lower chamber 55 of the mask 51 to permit the exhausting fan to suck air therefrom. The waste air as sucked therefrom by fan 3 is discharged through an outermost port 33 at the outlet by fan 3. 
     The two ventilating air fans 4 are disposed on opposite sides of motor 1. An air entrance port 42 is formed on housing C atop both fans 4. Port 42 may be provided with an adjusting means for adjusting the incoming air rate. A discharge port 43 is formed on the lower part of housing C opposite to air entrance port 42 and is connected with a flexible air hose 44 to lead the air into helmet H to comfort the wearer&#39;s head. The housing is provided with the top roof 45 to protect the fans and the motor from rain. 
     Another preferred embodiment of the present invention is shown in FIG. 4. The structure of such an embodiment is similar to that as afore-mentioned except two canisters 22a, 22b are disposed on opposite sides of the fans. The driving motor 1a provides a shaft 11a for fixing two supplying air fans 2a, 2b; an exhausting fan 3a and a ventilating fan 4a. 
     Two partition plates 41&#39; are provided so that one plate separates the supplying fan 2a from exhausting fan 3a and another plate separates another supplying fan 2b from ventilating fan 4a. The air sucked from fan 2a is filtered through first canister 22a and is then led through tube 26a into second canister 22b for further poison filtration. The fresh air is then delivered through tube 26b to mask 51 for breathing by the wearer. The waste air is sucked from the mask by exhausting fan 3a and discharged through port 3b. The ventilating fan 4a sucks the air through inlet port 4a&#39; and directs the air into wearer&#39;s helmet through discharge tube 44a. 
     The power source 6 electrically connected with motor 1 is fitted on the rear portion of helmet to balance the fans and motor fixed on the front portion thereof. The facepiece 5 is pivotedly mounted on the helmet H. 
     The present invention is superior to conventional respirator as follows: 
     1. The supply of fresh air and discharge of waste air is operated in forced ventilation for more comfortable working environment. 
     2. A cassette of stimulant or refreshing agent is provided for further cleaning the air and exciting the wearer&#39;s spirit. 
     3. The present invention is compact in structure and small in volume for easier wearing and lower production cost.