New Full-face Mask with Much Larger Look-down Field of Vision

Abstract

This invention refers to a tight-fitting full-face mask for respiratory protection, which can provide a much larger look-down field of vision as a new model. It can be applied to industrial compressed air respirator with a self-contained open circuit, positive-pressure firefighting respirator, oxygen respirator, gas mask, and middle-pressure tube respirator. This has helped to address the problems that existing wide-field full-face masks can only provide a small field of vision and users cannot observe surrounding environments well with it. Besides breaking through traditional structure of existing wide-field full-face masks, this application reduces interface area in the middle of the bottom and moves it downwards to the greatest extent. The distance H is designed to be 137 mm-170 mm (except transitions) and distance L to 65 mm-98 mm for the purpose of obtaining a brand-new model. In this way, point A will be lowered and brought closer to face to improve look-down field of vision for the sake of super-wide field of vision which users expect for.

Claims

1. The new full-face mask with a much larger look-down field of vision shows following features: the mask is equipped with a compound lens comprised of valid visual area, interface installing area and tightening area. Point A is an intersection outside the middle part between interface installing area and valid visual area at the lower part of the lens. Point B is the highest point outside the middle of valid visual area. Point C is in the middle of the intersection between the lower part of interface installing area and tightening area. H refers to the distance between Point A and Point B, and L to the distance between Point A and Point C. According to design, H=137 mm-170 mm and L=65 mm-98 mm.

2. As described by claim 1, the brand-new full-face mask with a much larger look-down field of vision shows following characteristics: the curved surface of valid visual area's lens consists of cylindrical surface, conical surface and approximate spherical surface.

3. As described by claims 1, the full-face mask above can be applied to gas mask, compressed air respirator with a self-contained open circuit, positive-pressure firefighting respirator, oxygen respirator and middle-pressure tube respirator.

4. As described by claims 2, the full-face mask above can be applied to gas mask, compressed air respirator with a self-contained open circuit, positive-pressure firefighting respirator, oxygen respirator and middle-pressure tube respirator.

Description

EXPLANATIONS ON FIGURES

[0014] Detailed descriptions on non-restrictive examples are conducted according to figures below, which can make other features, aims and advantages of this application more clear.

[0015] FIG. 1 Plan sketch for good example of new full-face mask with a much larger look-down field of vision in this application;

[0016] FIG. 2 Schematic diagram for critical points shown by new full-face mask with a much larger look-down field of vision;

[0017] FIG. 3 Structural diagram for new full-face mask with a much larger look-down field of vision in this application;

[0018] FIG. 4 Sectional view for new full-face mask with a much larger look-down field of vision in this application;

[0019] FIG. 5 Structural diagram for mist deflector in this application.

DESCRIPTIONS ON EVERY PART IN THE FIGURES

[0020] 1inlet; [0021] 2mist deflector; [0022] 3mouth-nose mask; [0023] 4lens; [0024] 5main body of soft sealing gel; [0025] 6hoop; [0026] 7medium-sized standard head model; [0027] 12pupil's position; [0028] 13interface installing area; [0029] 14valid visual area; [0030] 15horizontal line of sight; [0031] 16maximum low line of sight.

SPECIFIC IMPLEMENTATION MODE

[0032] Detailed explanations on this application will be made according to examples. The examples below will help technicians in this field to understand this application better, but will not impose any constraints over this application. It is worth noticing that any changes and improvements made by ordinary technicians in this field on the premise of following the thoughts of this application shall fall within the protective scope of this application.

[0033] According to FIGS. 1-4, the new full-face mask with a much larger look-down field of vision is equipped with a compound lens 4. It is comprised of valid visual area 14, interface installing area 13 and tightening area. Point A is an intersection outside the middle part between interface installing area and valid visual area at the lower part of the lens. Point B is the highest point outside the middle of valid visual area. Point C is in the middle of the intersection between the lower part of interface installing area and tightening area. H refers to the distance between Point A and Point B, and L to the distance between Point A and Point C. According to design, H=152 mm and L=83 mm.

[0034] Apart from these, the full-face mask above also includes functional interfaces 1 like expiratory valve and inlet, mouth-nose mask 3, main body of soft sealing gel 5, hoop 6, headband or hood, and mist deflector 2. The functional interface 1 is connected with mouth-nose mask 3 at one end and with lens 4 at the other. With the mist deflector 2 located between functional interface 1 and lens 4, the main body of soft sealing gel is wrapped around lens 4 and then tightened with hoop 6.

[0035] According to FIG. 1, the new full-face mask in this example is simulated with medium-sized head model, which includes pupil's position 12, horizontal line of sight 15, and maximum low line of sight 16. The look-down angle of A point is 51, which has given rise to a much larger look-down field of vision.

[0036] In this application, the mouth-nose mask is re-designed according to standard head model, and nose position is designed in accordance with the lowest position of the intersection between two eyes so that the look-down field of vision will not be smaller than the lens' greatest look-down field of vision.

[0037] As for the full-face mask with a much larger look-down field of vision, the curved surface of valid visual area's lens consists of cylindrical surface, conical surface and approximate spherical surface.

[0038] The full-face mask in this application can be applied to industrial compressed air respirator with a self-contained open circuit, positive-pressure firefighting respirator, oxygen respirator, gas mask and middle-pressure tube respirator.

[0039] The above is an explanation on example of this application. There is a need to understand that the specific implementation modes above are not a constraint over this application, and any transformations or modifications made by technicians in this field within the scope of the claim will not have an impact on the contents of this application.