A face shield for being arranged in front of a portion of the face of a user

Abstract

A face shield for being arranged in front of a portion of the face of a user, comprising: fastening means, a headgear, wherein the fastening means attach the upper portion of the face shield to the headgear, being characterized by: the face shield: being adaptable to a head shape of a user, the face shield provides a sealing contact with the temple areas and extending along a longitudinal z axis downward from the headgear, and being provided with a pre-shaped U-shape which will provide a pinching effect causing the face shield to connect in an air tight manner to the users temple areas and downwards due to local stress along the z axis in the shield, thus adapting to different head profiles along the z-axis when arranged over the face for providing a channel able to lead an airstream past the eyes, nose and mouth of the user.

1 .- 22 . (canceled) 
     
     
         23 . A face shield for being arranged in front of a portion of the face of a user, comprising:
 fastening means,   a headgear, wherein the fastening means attach an upper portion of the face shield to the headgear,   wherein the face shield:
 is adaptable to a head shape of a head of a user, the face shield providing a sealing contact with temple areas and extending along a longitudinal z axis downward from the headgear, and 
 is provided with a pre-shaped U-shape to provide a side pinching effect causing the face shield to connect in an air tight manner to the temple areas and downwards due to local stress along the z axis in the face shield, thus adapting to different head profiles along the z axis when arranged over the face for providing a channel able to lead an airstream past eyes, a nose, and a mouth of the user, 
   the face shield having a curved form shape around a longitudinal axis of the face shield, the curved form being maintained by the face shield having one or more longitudinally crease folds arranged to be in a lower portion of the face shield, such that a vertical sight field and a horizontal sight field through the face shield is not disturbed by any crease folds and thereby minimizing glare and increase the side pinching effect.   
     
     
         24 . The face shield according to  claim 23 , wherein side portions of the face shield are substantially flat and parallel with a side of the head of the user from a temple and downwards, maintaining flexibility and adaptability to changing head shape along the z axis. 
     
     
         25 . The face shield according to  claim 23 , the face shield having a form provided by one of a vacuum form process, a thermoforming process, or pre-molded in a form. 
     
     
         26 . The face shield according to  claim 23 , wherein the face shield is made of one or more of:
 transparent material,   semi-transparent material,   polymer/plastic,   pressure formed polymer/plastic,   heat formed polymer/plastic,   transparent or semi-transparent glass,   transparent or semi-transparent fibers, or   transparent or semi-transparent composites.   
     
     
         27 . The face shield according to  claim 23 , wherein the headgear comprises an air supplying device and an air distribution device for channeling air from the air supplying device to a forehead area and wherein the air is channeled from the forehead area down past the face of the user when the air supplying device is activated. 
     
     
         28 . The face shield according to  claim 27 , wherein the air supplying device comprises an air purifying device. 
     
     
         29 . The face shield according to  claim 27 , wherein the face shield stretches downward past a cheek of the user, and one or more filter strips are attached on an inside of a bottom part of the face, and thus providing an effect of filtering away aerosols from exhaled air of the user. 
     
     
         30 . The face shield according to  claim 27 , wherein a front outlet device is formed to distribute air from the air supplying device along a width of the forehead of the user and behind an upper portion of the face shield where the fastening means attach the face shield to the headgear, in a semi laminar manner, such that air with high carbon dioxide (CO2) content is displaced from area in front of the eyes, the nose and the mouth. 
     
     
         31 . The face shield according to  claim 30 , wherein the front outlet device comprises an air laminating mesh spread along the front outlet device. 
     
     
         32 . The face shield according to  claim 30 , wherein the front outlet device comprises a plurality of outlet nozzles/output orifices spread along the front outlet device. 
     
     
         33 . The face shield according to  claim 32 , wherein the plurality of outlet nozzles/output orifices are distributed over an area extending sideways and outwards to increase an air exit area behind the upper portion of the face shield where the fastening means attach the face shield to the headgear. 
     
     
         34 . The face shield according to  claim 33 , wherein the plurality of outlet nozzles/output orifices are distributed over an area extending outwards from an innermost position being a minimum distance from the forehead portion above the eyes to provide an airstream having less draft close to the eyes. 
     
     
         35 . The face shield according to  claim 23 , wherein a frame is provided along portions of the face shield to enhance form fitting features pinching the face shield in a biased enclosing manner around the face area of the user. 
     
     
         36 . The face shield according to  claim 28 , wherein the air purifying device comprises:
 a motor,   a power source,   an impeller being rotated by the motor, and   a rotating filter being rotationally connected to the impeller.   
     
     
         37 . The face shield according to  claim 36 , wherein the rotating filter comprises a pleated filter. 
     
     
         38 . The face shield according to  claim 36 , wherein the impeller comprises a plurality of fan blades arranged radially extending from a center cone, the center cone having a tapering form towards a first air intake side, and the fan blades being formed to provide an axial fan at the air intake side, such that air is set in motion with a rotational flow pattern, the fan blades being formed to provide a radial fan towards the circumferential outlet side of the impeller, such that air is pushed towards the rotationally connected filter with a substantially uniform distribution over the inlet channels of the filter in a z direction. 
     
     
         39 . The face shield according to  claim 36 , wherein the air distribution device is formed in an enclosing manner around the circumferential outlet of the impeller and the filter and further comprising a conduit forming a channel for the air flow from the enclosure around the impeller and filter towards and through the front outlet device and to the forehead area of a user. 
     
     
         40 . The face shield according to  claim 37 , wherein the air filters have a cylindrical form, wherein the face shield is configured according to the relation Gu=fh*pr/(2*ro*ε{circumflex over ( )}¼)>0.8, wherein Gu number correlates to a function of the commercial usefulness based on, and accounting for, needs of the user, such as CADR, dB, product size, functioning and cost, wherein pr=/pleat spacing, and pleat spacing is the distance between two adjacent pleat tops on the inner radius, and ε is the ASHRAE efficiency. 
     
     
         41 . The face shield according to  claim 40 , wherein the air filters have a height between 10 and 30 mm, and an outer diameter between 65 and 105 mm. 
     
     
         42 . The face shield according to  claim 41 , wherein the air filters have a height of 25 mm, and an outer diameter of 85 mm. 
     
     
         43 . The face shield according to  claim 23 , wherein the fastening means comprise an lock/unlock feature enabling the face shield to attach and to detach from the headgear and thereby providing an replaceable face shield function. 
     
     
         44 . The face shield according to  claim 41 , wherein the air filters have a height between 15 and 25 mm, and an outer diameter between 75 and 95 mm.