FI69757B - HALVMASK FOERSEDD MED EN FILTERBRYGGA - Google Patents

Description

69757

Half mask with filter bridge

The invention relates to a personal respirator for a half mask for filtering dust and gases from the breathing air.

Commonly known dust filter masks are natural 5 or man-made fiber cup cups. BII type, in which inhalation and exhalation take place through the mask structure, with the mask acting as a filter. Full and half mask protectors made of clamps or similar solids and heavy materials are equipped with 10 in and out breathing valves, most often also a gas filtration device.

A problem with the use of breathable dust filters is the mask structure, which is dampened by the condensation moisture generated by the breath, which causes the mask to inhale with a detrimental deformation as it flattens. These types of protectors are characterized by the low surface area of their filterable part, both the degree of dust separation and the dust-binding capacity, and are therefore uneconomical due to their short service life. This type of protector also has 20 major weakness uncertain condensation on the face.

Due to the abundant condensation of rubber or similar dense mask structures, it has generally not been possible to adequately prevent the disadvantages of sweating, a factor which limits mask users for sensitive skin. These full or half masks generally have a heavy-duty actual filter portion tubularly constructed from the mask portion forward so that the entire center of gravity of the mask supported by the straps is away from the wearer's face, causing unnecessary tightening of the straps in the head and nis 30. due to dizziness caused by hypoxia.

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The tubular filter mechanism built in front of the mask invariably limits the working view downwards, and, due to the small filter surface area, prevents the use of sufficiently wide-ranging filter materials required for efficient filtration.

5 The main reason for the low utilization rate of personal respirators is the aversion experienced by users to the uncomfortable use of masks. By means of the filter bridge 1 and the air space 11 and structure-10 model of the half-mask 16 with a filter bridge according to the invention (Fig. 8), a decisive improvement is achieved in the above-mentioned drawbacks. To achieve this, the half mask according to the invention is characterized by what is set forth in the characterizing part of claim 1.

Important advantages of the invention are: In the polysilter material space 9 of the filter bridge 1, a wide range of filter materials can be used straight and free without the filter being compressed or tensioned. The gas filter box housings 2 located at the rear of the filter bridge 1 balance the center of gravity of the mask to reduce the tightening of the fastening strap 15 on the head.

Under the influence of the air space 11, the face part 12, as well as the filter bridge 1 and the dust and gas filter materials therein remain dry. The lightness of the half mask 16, the working field of view and the quick change of filter materials. The thrust applied from the locking device 14 of the filter bridge cover 4 directly from the front to the face of the face pin 25 equalizes the elasticity of the mask structure to promote the mask's adaptation and sealing to the wearer's face.

Pattern list:

Figure 1. Filter bridge (1) dust filter support strips (1a) 30 gas filter box housing (2) filtered air transfer ducts (3) Filter bridge cover (4) filter bridge cover hinge (5).

Figure 2. Filter bridge (1) dust filter support strips (1a) Gas filter box housing (2) filtered air 35 transfer ducts (3) filter bridge cover (4) no inhalation valve (7) exhalation valve (6) dust filter space (9) air space (11) face part (12).

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Figure 3. Filter bridge Kanai (4) filter bridge cover hinge (5) air intake openings (13).

Figure 4. Gas filter box housing (2) filter bridge cover (4) cover hinge (5) air space (11) face part (12).

Figure 3. Gas filter box housing (2) filter bridge cover (4) exhalation valve (6) inhalation valve (7) face seal (10) air space (11).

Figure 6. Gas filtration box (8).

Figure 7. Filter bridge cover locking device (14).

Figure 8. Half mask fastening strap (15) half-mari (16).

In the following, the invention will be explained in detail with reference to the accompanying drawings:

The filter bridge 1 (Fig. 1) is made by the mold pulp method from wood pulp into a light thin semicircular shape, which is joined at its edges by gluing around the face part 12 so that an air space 11 is formed between the filter bridge 1 and the face part 12. (Figures 2-4 ) The dust filter support strips 1a on the outer surface of the filter bridge 1 keep the filter material dust filter in space 9 elevated, dry and straight without compression or tension, (Fig. 2) The support strips 1a form filtered air to the face part 12. (Figures 2-5) In the filter bridge 1, the half mask 16 (Fig. 8) 15 can be used with such wide-ranging dust and gas filter materials that meet the requirements of effective and economical respiratory protection and mask comfort. (Figures 4-5) Between the filter bridge 1 and the face part 12 (Figures 2-4 and 5) extending into the air space 11, the gas filter box compartments 2 placed on the sides at the rear of the filter bridge 1 balance the entire center of gravity of the mask close to the wearer's face. 4) The cover 4 of the filter bridge is made of perforated wood pulp, opening in the middle from the hinge 5 for changing filters, (Fig. 3) 4 69757

The fastening strap 15 is a strip of suitably hard, suitably thin rubber sheet, (Fig. 8) The face seal 10 is a cotton press.

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In particular, it should be noted that many modifications can be made to the half mask according to the invention within the scope of the inventive idea defined by the following claims:

The gas filter box may be two or more layers 15 on top of each other, depending on the filtration need.

The half mask can be treated according to the special conditions of flammable or humid conditions.

The fastening strap of the half mask can be, for example, a slightly stretchy braid.

The half mask according to the invention can be made in different sizes for use by women and children, as well as in different colors, e.g. civil protection and laboratory use.

The face seal can be a cotton pad or, for example, a cellular rubber mold.

Claims (3)

5 69757 latency claims A half-mask with a filter bridge, comprising a personal respirator made of an elastic wood pulp molding pulp method to separate the face from the breathing air by means of a fastening strap (15), characterized in that the half-mask is provided with a filter bridge (1) with a dust filter support 1a) with filtered air transfer channels (3) between the support strips. The gas filtration box housings (2) extend into the air space (11) between the filter bridge (1) and the face part 10 (12). Half mask according to Claim 1, characterized in that there is an air space (11) between the filter bridge (1) and the face part (12). Half mask according to Claims 1 to 2, characterized in that the half mask is provided with a filter bridge cover (4).