KR102379972B1 - Full Face Mask of View Replacement Type - Google Patents

Abstract

The present invention relates to a field-replaceable front mask, comprising: a front frame having an open front view securing port and having an intake port and an exhaust port formed at the lower part; a front sealing material disposed on the rear side of the front frame to be in close contact with the face; a fixing strap connected to the front frame or front sealing material and fixed to the head; a lens mounting unit including a lens installed to seal the viewing port of the front frame; And, since it characterized in that it comprises a film transfer unit for moving the film disposed to face the lens from the front of the lens in the lateral direction, so that the operator can quickly change the field of view while wearing the front mask work It has the advantage of improving work efficiency because it can be performed continuously.

Description

Full Face Mask of View Replacement Type

The present invention relates to a field replacement type full-face mask, and more particularly, it is possible to easily replace a damaged or dirty field of view with a clear field of view while wearing a mask, thereby maintaining continuity of work and extending the replacement cycle of the mask to reduce costs. It relates to a field-of-view replaceable full-face mask that can avoid waste and promote eco-friendliness.

Full-face masks are widely used in construction sites or manufacturing plants to protect workers from dust or harmful particles in the air.

Such a front mask is also called a dust mask, and has a structure in which air sucked through a predetermined passage is sucked through a filter after impurities are filtered, and the discharged air is discharged through a separate passage.

In addition, the mask is made to be in close contact with the entire face including the nose and mouth to enhance the dustproof effect.

That is, when the front mask is in close contact with the face, external air cannot permeate, so only the air that has passed through the filter is breathed, so the dustproof effect is further increased.

However, in the prior art, as disclosed in "Front Respiratory Protection Device" of Korean Patent No. 10-1385831, when the lens is assembled and installed on the front side of the front frame, if the lens is damaged during operation, take off the front mask and use a separate tool Therefore, there was a difficulty in replacing the lens after disassembling the front frame.

In addition, when disassembling the front frame, since the intake member and the exhaust member mounted on the front frame had to be removed first, the operation was cumbersome, and it took a lot of time for the replacement operation, so there was a problem that continuous operation was difficult.

On the other hand, due to the difficulty of disassembling the lens, a new front mask may be purchased when the lens is damaged, but there is also a disadvantage in that the economic burden is increased accordingly.

Republic of Korea Registration Special Publication No. 10-1385831

The present invention has been devised to solve the above problems, and it is an object of the present invention to be configured to simply change the field of view without a separate tool while wearing a full mask, so that the work that was done can be continuously performed without interruption. The purpose is to make it possible.

In addition, an object of the present invention is that the mask can be continued to be used after simply replacing only the field of view, thereby extending the service life of the mask, thereby reducing the cost of purchasing the mask and promoting eco-friendliness by minimizing the amount of mask discarded. It has a different purpose.

In order to achieve the above object, the field replacement type front mask according to an aspect of the present invention,

a front frame having an open front view securing hole and having an intake port and an exhaust port formed at the lower part;

a front sealing material disposed on the rear side of the front frame to be in close contact with the face;

a fixing strap connected to the front frame or front sealing material and fixed to the head;

a lens mounting unit including a lens installed to seal the viewing port of the front frame; and,

a film transfer unit for moving a film disposed to face the lens from the front of the lens in a lateral direction;

It is characterized in that it comprises and is configured.

The film transfer unit,

a first film support portion and a second film support portion respectively formed on both sides of the front frame with the lens mounting unit interposed therebetween;

a film driven roll and a film driving roll which are respectively rotatably disposed on the first film support part and the second film support part;

a film drawn out from the film driven roll and wound on the film driving roll and connected; and,

a driving unit installed under the film driving roll to rotate the film driving roll;

It is characterized in that it is configured to include.

In addition, it further comprises a film cover through which a viewing hole opposite to the viewing hole is formed when combined, wherein the film cover is a hinge formed on the outside of any one of the film driven roll and the film driving roll in the front frame. It is horizontally rotated to be coupled to the first film support part and the second film support part while covering the film, the film driven roll and the film driving roll, or separated from the first film support part and the second film support part and turned around the hinge part It is characterized in that it can be obtained.

The drive unit is

Receiving case with space inside;

a ratchet gear mounted on the inside of the accommodating case, teeth are formed on an outer circumferential surface, and a plurality of ratchets are formed on the inner circumferential surface to be inclined in one direction;

a drive mechanism having a ratchet pin engaged with the ratchet formed on the inner circumferential surface of the ratchet gear is installed on the outer circumferential surface, and the ratchet gear is engaged with the ratchet pin and rotates when the ratchet gear rotates in one direction without rotating in the other direction;

a roll connecting gear having teeth formed on the outer circumferential surface to engage the outer circumferential teeth of the ratchet gear and to which the film driving roll is connected; and,

a lever disposed under the accommodation case and fixedly connected to the driving mechanism;

including,

The drive unit and the accommodation case are connected by a restoring means, so that a restoring force by the restoring means acts on the drive tool.

In addition, the field replacement type front mask according to another aspect of the present invention,

a front frame having an open front view securing hole and having an intake port and an exhaust port formed at the lower part;

a front sealing material disposed on the rear side of the front frame to be in close contact with the face;

a fixing strap connected to the front frame or front sealing material and fixed to the head; and,

and a lens mounting unit including a lens installed to seal the viewing port of the front frame,

The lens mounting unit,

a lens seating part formed to support one surface of the lens around the viewing device;

a support bar extending along the upper and lower sides of the lens seat and formed to protrude forward to support the upper and lower sides of the lens;

a locking bar extending along both sides of the lens seating part and protruding forward; and,

a curved lens cover detachably coupled to the locking bars respectively formed on both sides;

It is characterized in that it comprises and is configured.

In this case, when the locking bars formed on both sides are viewed from the transverse cross-section, a first locking groove forming an acute angle is formed between the surface of the front frame and the outer surface of the locking bar, and on both sides of the lens cover, the first locking groove is formed. 1 It is characterized in that the locking projection is formed to be caught in the locking groove.

An acute angle second locking groove is formed between both rear surfaces of the lens cover and the locking protrusion.

It is characterized in that the sealing protrusion is attached to the upper surface of the lens seating part along the circumferential direction.

According to the field of view replacement type front mask of the present invention having the configuration as described above, the operator can quickly change the field of view while wearing the full mask, so that the work can be continuously performed without interruption, thereby improving work efficiency. There is an advantage that there is

In addition, according to the present invention, there is an advantage that the work environment is improved because various mechanisms and parts for replacing the field of view are not required.

In addition, according to the present invention, since there is no need to replace only the field of view and the mask itself, the service life of the mask can be extended, and the amount of mask discarded can be minimized, thereby promoting eco-friendliness and reducing the purchase cost of the mask. There are also advantages.

In addition, according to the present invention, anyone can easily replace the field of view without a separate tool, even if it is not an expert, so it is convenient to use and has the advantage of continuously maintaining the effective field of view of the operator.

In addition, according to the present invention, the lever of the driving unit configured to continuously transport the film is installed in the lower part of one side of the film cover, so that it is rotated, so that it is convenient to use.

1 is a front view of a replaceable field of view full-face mask according to an embodiment of the present invention.
2 is a rear view of a field replacement type full-face mask according to an embodiment of the present invention.
3 is a plan view of an interchangeable field-of-view full-face mask according to an embodiment of the present invention.
4 is a front view of the replaceable field of view front mask showing a state in which the film cover is folded in FIG. 1 .
FIG. 5 is a cross-sectional view taken along line BB in FIG. 1 .
6 is a perspective view showing the structure of a lens mounting unit in the field of view replaceable front mask according to an embodiment of the present invention.
FIG. 7 is a view in which the lens cover is removed from FIG. 6 .
8 is a cross-sectional view of the lens mounting unit viewed from AA in FIG. 6 .
9 is an exploded cross-sectional view of FIG. 8 .
10 is a detailed perspective view showing the exhaust member in FIG. 1 .
11 is a view showing the internal configuration of the driving unit of the replaceable field of view face mask according to an embodiment of the present invention;
12 is a view showing the structure of the ratchet gear and the roll connecting gear of the replaceable field of view front mask according to an embodiment of the present invention.
13 is a diagram illustrating a structure of a driving mechanism of a field replacement type full-face mask according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, the field of view replaceable front mask 10 according to the embodiment of the present invention is in close contact with the worker's face to protect the worker's face, secure the working field of view, and air filtered from the outside As a front mask configured to breathe, it is largely composed of a front frame 100, a front sealing material 200, a fixing strap 300, and a configuration including a field of view replacement means (400).

First, the front frame 100 has a structure that surrounds the face, and a viewing port 101 (refer to FIG. 7 ) with an open front is formed, and an intake port 102 and an exhaust port 103 are formed at the lower portion.

Such a front frame 100 may be integrally injection-molded, and a field of view replacement means 400 capable of maintaining a clear field of view is mounted.

It is preferable that the field of view securing device 101 formed on the front frame 100 is opened as wide as possible so that the work field of the operator can be sufficiently secured.

And, the front frame 100 may be made of an opaque material so that the operator's field of vision can be concentrated or protected through the viewing device 101 .

The intake ports 102 are openly formed on both lower sides of the front frame 100 , and the exhaust ports 103 are openly formed in the lower center of the front frame 100 .

An intake member 110 is mounted on the intake port 102 , and external air is filtered through an internal filter of the intake member 110 and introduced into the replaceable field of view front mask 10 .

Then, the exhaust member 120 is mounted to the exhaust port 103 , and the air inside the replaceable field of view front mask 10 escapes to the outside through the exhaust member 120 .

At this time, as shown in FIG. 10 , the exhaust member 120 may include a breathing apparatus sealing material 121 , an exhaust connection port 122 , and an inflow prevention port 123 .

The breathing apparatus sealing material 121 is formed to have suction ports 121a on both sides while covering the nose and mouth, and the suction ports 121a are introduced into the inside of the field-of-view replaceable front mask 10 through the intake member 110 . The air is allowed to flow into the inside of the breathing apparatus sealing material 121 .

The exhaust connector 122 is installed to communicate with the inside of the breathing apparatus sealing material 121 and the exhaust port 123a, and through this, the internal air of the breathing apparatus sealing material 121 is discharged to the outside.

The inlet port 123 is formed at the end of the exhaust connector 122 and has an outlet port 123a oriented downward.

At the same time as the internal air is discharged to the outside by the inlet prevention port 123, the inflow of foreign substances from the outside is prevented.

On the other hand, the front sealing material 200 is in close contact with the operator's face to seal, is mounted on the back side of the front frame 100 is formed to extend in a curved direction along the circumferential direction.

The front sealing material 200 is preferably made of a rubber or synthetic resin material having excellent elasticity so that the field-of-view replacement type front mask 10 can be mounted on the operator's face to properly seal it.

In addition, an upper connector 210 and a lower connector 220 are formed on the upper and lower portions of the front sealing material 200 , respectively, and are connected by a fixing strap 300 .

The upper coupler 210 and the lower coupler 220 extend to both upper and lower ends of the front sealing material 200 , respectively, and are connected by a fixing strap 300 .

The fixing strap 300 is put on the operator's head so that the field-of-view replaceable front mask 10 can be fixed to the operator's face.

Therefore, the fixing strap 300 is connected to the upper connector 210 and the lower connector 220 of the front sealing material 200 and is configured to be adjustable in length or to be elastically deformed easily, so that anyone can do it regardless of the size of the operator's head. It is desirable to be able to wear it.

The fixing strap 300 may be directly connected to the front frame 100 .

1 and 4 to 8 , the field of view replacement means 400 according to the present invention is configured to change the field of view of an operator, and is implemented in the lens mounting unit 150 or the lens mounting unit 150 ) is implemented by the film transfer unit (F) disposed in front.

First, as shown in FIGS. 6 to 8 , as an example of the field of view replacement means 400 , a lens including a lens 159 sealing the field of view securing hole 101 of the front frame 100 is mounted. The unit 150 will be described.

According to the present invention, the lens mounting unit 150 includes a lens mounting part 151 formed to support one surface of the lens 159 around the field of view securing device 101 , and the lens mounting unit 151 . A support bar 152 extending along the upper and lower sides and protruding forward to support the upper and lower sides of the lens, and a locking bar 153 extending along both sides of the lens seating part 151 and protruding forward. ), and a curved lens cover 156 that is detachably coupled to the locking bars 153 formed on both sides, respectively.

When the lens cover 156 is coupled to the locking bar 153 , the edge of the lens 159 is pressed to enable a firm coupling.

At this time, it is preferable that the sealing protrusion 155 is attached to the upper surface of the lens seating part 151 along the circumferential direction to ensure the sealing of the lens 159 mounted thereon.

As shown in FIGS. 8 and 9 , when the locking bars 153 formed on both sides of the lens seating part 151 are viewed from a transverse cross-section, the surface of the front frame 100 and the locking bars 153 are ) between the outer surfaces of the first engaging groove (153a) forming an acute angle is formed, and on both sides of the rear surface of the lens cover 156, the engaging projection (156a) caught in the first engaging groove (153a) may be formed. .

In this case, it is preferable to form a bent portion 156b in which one end surface of the lens cover 156 is slightly bent upwardly with respect to the other surface so as to be advantageously separated from the front frame 100 with a finger. .

In particular, in order to ensure engagement with the first locking groove 153a, acute-angled second locking grooves 156c may be formed between both rear surfaces of the lens cover 156 and the locking protrusions 156a. .

In a state in which one side of the lens cover 156 is hung on the one-side locking bar 153 and the other side is pressed against the other-side locking bar 153 , the locking protrusion 156a elastically deforms the other locking bar 153 . While riding, it is firmly caught in the first locking groove (153a).

Accordingly, the lens cover 156 presses the lens 159 to completely seal the viewing port 101 of the front frame 100 .

The lens 159 does not need to be formed in a curved shape in advance, and it is preferable to be made of a flexible material so that the lens cover 156 is naturally deformed to a curved surface by pressing pressure when coupling the locking bar 153 to the locking bar 153 . .

In addition, when it is necessary to replace the lens 159 , the operator directly attaches the lens cover 156 to the one locking bar 153 with the other locking bar 153 while wearing the field-of-view exchangeable front mask 10 . ) to elastically deform the locking protrusion 156a by bending it from the first locking groove 153a.

Accordingly, it is possible to quickly replace the lens 159 from the front frame 100, thereby continuously performing the work performed by the operator.

In this way, there is no need to take off or disassemble the front mask to replace the lens 159, and a separate work tool is not required, so anyone can easily and simply replace it.

In addition, by treating the inner surface of the lens 159 with a coating for anti-fogging, it is possible to prevent fogging due to the worker's breathing, and it is possible to maintain a clear view during operation, so that the operation can be continuously performed.

On the other hand, with reference to FIGS. 4 and 5, as another example of the field of view replacement means 400 will be described with respect to the film transfer unit (F).

The film transfer unit (F) according to the present invention includes a first film support portion 491 and a second film support portion 492, the first film support portion 491 respectively formed on both sides with the lens mounting unit 150 interposed therebetween. ) and the film driven roll 450 and the film driving roll 460 which are respectively rotatably disposed on the second film support 492 , are drawn out from the film driven roll 450 and wound around the film driving roll 560 and connected It is configured to include a driving unit 480 disposed below the film driving roll 460 to rotate the film driving roll 460 .

In order to cover the film 430, the film driven roll 450, and the film driving roll 460, a film cover 440 through which a viewing hole 441 opposite to the viewing hole 101 is formed is additionally provided. may be included.

The film cover 440 is horizontally rotated about the hinge portion 442 formed on the outside of any one of the film driven roll 450 and the film driving roll 460 in the front frame 100 to rotate the film 430 . ) and the film driven roll 450 and the film driving roll 460 are coupled to, or separated from, the first film support part 491 and the second film support part 492 while covering the hinge part. it is possible

In this case, the hook portion 446 formed at the free end of the film cover 440 is elastically caught on the end of the frame supporting the film driving roll 460, and when it is pulled with a finger, it is elastically deformed and naturally hinged. be swept away by knowledge.

In addition, it is preferable that the inner surface of the film cover 440 has a shape corresponding to the outer peripheral surfaces of the first film support part 491 and the second film support part 492 so that there is no shaking during use.

In addition, as shown in FIGS. 11 to 13 , the drive unit 480 is mounted inside the accommodation case 481 having a space therein, the accommodation case 481 , and teeth are formed on the outer circumferential surface. and a ratchet gear 482 in which a plurality of ratchets 482a are formed so as to be inclined in one direction to the inner circumferential surface, and a ratchet pin 483a engaged with the ratchet 482a formed on the inner circumferential surface of the ratchet gear 482 are installed on the outer circumferential surface, ，The ratchet gear 482 does not rotate when rotating in the other direction, but when the ratchet gear 482 rotates in one direction, the driving mechanism 483 that engages with the ratchet pin 483a and rotates, the ratchet gear 482 Teeth are formed on the outer circumferential surface so as to engage the outer circumferential teeth, and the roll connecting gear 484 to which the film driving roll 460 is connected, and the accommodating case 481 and fixedly connected to the driving tool 483 and a lever 485 .

Since the driving tool 483 and the receiving case 481 are connected by a restoring means, a restoring force is always applied to the driving tool 483 .

In addition, a protrusion is formed on the upper side of the driving tool 483 and the ratchet pin 483a, and a spring 483b connecting the protrusions is provided.

The ratchet pin 483a has a tendency to be restored to its original position by the elastic force of the spring 483b, and is caught on the ratchet 482a of the ratchet gear 482 according to the rotation direction of the driving tool 483 and rotates together or It is possible to rotate independently of the ratchet gear 482 .

Accordingly, when the lever 485 is rotated in one direction, the driving tool 483 connected to the lever 485 rotates, and the ratchet pin 483a of the driving tool 483 is the ratchet 483a of the ratchet gear 482 . ) is caught and rotated together, and the tooth shape of the outer periphery of the ratchet gear 482 is engaged with the roll connecting gear 484, so that the film driving roll 460 coupled to the upper portion of the roll connecting gear 484 rotates while the film 430 is moved laterally.

In the ratchet gear 482, a first ratchet surface 482a-1 formed on the inner circumferential surface of the ratchet gear 482 and a second ratchet surface 482a-2 disposed at an acute angle to the first ratchet surface 482a-1 ) is repeatedly arranged, and the driving tool 483 is concentrically arranged inside the ratchet gear 482 and provided with a ratchet pin 483a to engage the ratchet 482a.

The ratchet pin 483a has a first seating surface 483a-1 inclined to abut the first ratchet surface 482a-1, and a first seating surface 482a-2 to be in contact with the second ratchet surface 482a-2. 483a-1), and the second seating surface 483a-2 is formed to be inclined.

When the driving tool 483 rotates in one direction by the first seating surface 483a-1 and the second seating surface 483a-2 of the ratchet pin 483a, the ratchet pin 483a is engaged with the ratchet 482a. It is possible to rotate the ratchet gear 482 .

In addition, the second seating surface 483a-2 is larger than the width of the second ratchet surface 482a-2 so that the driving tool 483 slides along the second ratchet surface 482a-2 and turns outward when the driving tool 483 rotates in the other direction. It is preferable to be formed narrowly.

In general, the ratchet gear 482 is made in such a way that the ratchet 482a is formed on the outer periphery and driven so that it occupies a large installation space, but the ratchet gear 482 of the present invention is a ratchet 482a formed on the inner circumferential surface. And it is possible to minimize the size of the drive unit 480 by the arrangement structure of the ratchet pin 483a of the drive tool 483 .

On the other hand, the roll connecting gear 484 has teeth formed on the outer periphery to engage the ratchet gear 482 and is connected to the film driving roll 460 through the gear connecting shaft 484a.

Accordingly, the roll connecting gear 484 is rotated by the driving of the ratchet gear 482 to rotate the film driving roll 460 .

In addition, the lever 485 is disposed under the receiving case 481, and is configured to be rotationally driven by an operator.

And the lever 485 is connected to the driving tool 483 to rotate the ratchet gear 482 and the roll connecting gear 484 .

At this time, it is preferable that the lever 485 has a plurality of protrusions formed on its outer surface so that the operator can easily rotate it.

On the other hand, the accommodating case 481 constituting the driving unit 480 is configured to be able to be separated up and down, and the ratchet gear 482, the driving tool 483 and the roll connecting gear 484 are accommodated therein. desirable.

In this way, as shown in FIG. 3 , the film 430 is installed in the form of a roll and continuously moves from one side of the lens 159 to the other by the driving of the driving unit 480 , so it is not used cleanly. And the transparent part can always be located in the viewing port 101.

That is, when the film 430 is contaminated by foreign substances and the field of view is obscured, by rotating the lever 485 in one direction to move the film 430 in the lateral direction, it is possible to change the view to a clear view.

In addition, when all the films 430 are unwrapped and the service life is over, the film cover 440 is opened by a hinge type, and the film driven roll 450 and the film driving roll 460 are separated by separating the film ( 430) can be replaced.

To this end, as shown in FIG. 2 , the first film support part 491 and the second film support part 492 to which the upper ends of the film driven roll 450 and the film driving roll 460 are rotatably coupled. It is preferable to elastically deform the upper brackets 491a and 492a.

Accordingly, the film 430 can be replaced by directly opening the film cover 440 and taking out the film driven roll 450 and the film driving roll 460 while the user is wearing the field replacement type front mask 10 . It has the advantage of making the work very convenient.

Meanwhile, the lower end of the first film support part 491 may be formed of a lower bracket 491b and the lower end of the second film support part 492 may be formed of the accommodation case 481 .

In this way, even if the lens 159 or the film 430 is damaged, it can be partially replaced by the field of view replacement means 400, so it can be used for a long time, and environmental pollution can be reduced by minimizing the replacement of parts, and the cost of purchasing a mask is reduced. It has the advantage of being

The field of view replacement means 400 according to the present invention may include only the lens mounting unit 150, include only the film transfer unit (F), or include both modules.

As described above, the basic technical idea of the present invention is configured so that the field of view replacement means mounted on the front frame can be simply replaced, and the operator's effective field of view is continuously maintained so that the operation can be continuously performed, and the field of view replacement type front It can be seen that the purpose is to provide a field-of-view replacement type full-face mask that extends the use period of the mask to promote eco-friendliness.

The embodiments of the present invention are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible within the scope of the following claims.

10: replaceable field of view full face mask
100: front frame
101: sight securing device
102: intake port
103: exhaust port
110: intake member
120: exhaust member
121: breathing apparatus sealing material
121a: intake
122: exhaust connector
123: inflow prevention port
123a: outlet
150: lens mounting unit
151: lens seating part
152: support bar
153: jam bar
153a: first locking groove
155: sealing projection
156: lens cover
156a: snag protrusion
156b: bend
156c: second locking groove
159: lens
200: front sealing material
210: upper connector
220: lower connector
300: fixed strap
400: visual field replacement means
430: film
440: film cover
441 : sight hole
442: hinge part
446: hook part
450: film driven roll
460: film driving roll
480: drive unit
481: accommodating case
482: ratchet gear
482a : Ratchet
482a-1: first ratchet face
482a-2: second ratchet surface
483: drive
483a: ratchet pin
483a-1: first seating surface
483a-2: second seating surface
483b: spring
484: roll gear
484a: gear connecting shaft
485: lever handle
491: first film support part
492: second film support part
F: film transfer unit

Claims (8)

a front frame having an open front view securing hole and having an intake port and an exhaust port formed at the lower part;
a front sealing material disposed on the rear side of the front frame to be in close contact with the face;
a fixing strap connected to the front frame or front sealing material and fixed to the head;
a lens mounting unit including a lens installed to seal the viewing port of the front frame; and,
a film transfer unit for moving a film disposed to face the lens from the front of the lens in a lateral direction;
It includes and consists of
The film transfer unit,
a first film support portion and a second film support portion respectively formed on both sides of the front frame with the lens mounting unit interposed therebetween;
a film driven roll and a film driving roll which are respectively rotatably disposed on the first film support part and the second film support part;
a film drawn out from the film driven roll and wound on the film driving roll and connected; and,
a driving unit installed under the film driving roll to rotate the film driving roll;
consists of,
The drive unit is
Receiving case with space inside;
a ratchet gear mounted on the inside of the accommodating case, teeth are formed on an outer circumferential surface, and a plurality of ratchets are formed on the inner circumferential surface to be inclined in one direction;
a drive mechanism having a ratchet pin engaged with the ratchet formed on the inner circumferential surface of the ratchet gear is installed on the outer circumferential surface, and the ratchet gear is engaged with the ratchet pin and rotates when the ratchet gear rotates in one direction without rotating in the other direction;
a roll connecting gear having teeth formed on the outer circumferential surface to engage the outer circumferential teeth of the ratchet gear and to which the film driving roll is connected;
a lever disposed under the accommodation case and fixedly connected to the driving mechanism;
a spring having protrusions formed on the upper side of the driving mechanism and the ratchet pin, respectively, and connecting the protrusions; and
a restoration means connected to the driving unit and the housing case to apply a restoring force to the driving unit;
Replaceable field of view full mask comprising a. delete According to claim 1,
Further comprising a film cover through which a viewing hole opposite to the viewing hole is formed when coupled, wherein the film cover rotates horizontally around a hinge formed on the outside of any one of the film driven roll and the film driving roll in the front frame to be coupled to the first film support part and the second film support part in a state of covering the film, the film driven roll and the film driving roll, or separated from the first film support part and the second film support part and turned around the hinge part Replaceable field of view full-face mask, characterized in that there is. delete According to claim 1,
The lens mounting unit,
a lens seating part formed to support one surface of the lens around the viewing device;
a support bar extending along the upper and lower sides of the lens seating part and formed to protrude forward to support the upper and lower sides of the lens;
a locking bar extending along both sides of the lens seating part and protruding forward; and,
a curved lens cover detachably coupled to the locking bars respectively formed on both sides;
Replaceable field of view full face mask, characterized in that it comprises a. 6. The method of claim 5,
When the locking bars formed on both sides are viewed in a transverse cross-section, first locking grooves forming an acute angle are formed between the surface of the front frame and the outer surface of the locking bars, and the first locking grooves are formed on both sides of the lens cover. Replaceable field of view full face mask, characterized in that the locking projection is formed. 7. The method of claim 6,
A field of view replaceable front mask, characterized in that acute-angle second locking grooves are formed between the rear surfaces of both sides of the lens cover and the locking projections. 6. The method of claim 5,
Replaceable field of view full mask, characterized in that the sealing projection is attached along the circumferential direction on the upper surface of the lens seating portion.

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