KR20150015334A - Collapsible helmet - Google Patents

Abstract

A collapsible helmet according to the present invention is a collapsible helmet in which a plurality of helmet fragments are connected on a common shaft to be able to rotate, and are developed in a terraced manner to form a cap shape. The plurality of helmet fragments have a slide type connection unit which connects an inner circumferential surface of one helmet fragment and an outer circumferential of another helmet fragments adjacent to one helmet fragment so as to allow the helmet fragments to slide in a circumferential direction, such that the helmet fragments can be easily developed, and the formed shape is stably maintained at the time of development. According to the present invention, the plurality of helmet fragments are easily developable and collapsible, and therefore, when the helmet is not used, the helmet fragments are collapsed in a slide manner to significantly reduce the size, and thus can be easily carried and stored, and when the helmet is used, the helmet fragments are developed to form a complete helmet, thereby sufficiently protecting the head of a user in a dangerous environment.

Description

Folding Helmet {COLLAPSIBLE HELMET}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a foldable helmet, and more particularly, to a foldable helmet which can be folded when not in use, stored, and deployed to be used as a complete helmet.

Generally, a helmet is used to protect a wearer's head. It is used for construction industry, bicycle, autobike, inline, leisure sports industry, military and defense industry of each country, disaster industrial area It is widely used to protect the head of the body in the back.

As shown in FIG. 1, the helmet 2 according to the related art is formed of a metal material or a plastic material, and is often inconvenient to carry because of its size and weight, so that the user often does not carry the helmet well.

In this way, the user does not carry the helmet so that the user performs the operation in a non-wearing state of the helmet, and therefore, the user's head can not be sufficiently protected at the work site and the like.

Accordingly, in the prior art, a helmet having improved portability due to air injection or the like has been developed in order to facilitate portability. However, in a complicated environment as in a construction site, if the air is escaped by a sharp object, There is a problem that the manufacturing cost is increased.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a helmet which can be easily carried and stored by folding a helmet when the user does not use the helmet, And which can sufficiently protect a user's head in a dangerous environment due to wearing of the helmet.

Technical Solution In order to accomplish the above object, the present invention provides a foldable helmet, wherein a plurality of helmet flakes are rotatably connected to each other on a common axis and are formed in a hat shape in a stepwise manner, And a slide type connecting means for slidably connecting the inner circumferential surface of one helmet piece portion and the outer circumferential surface of the adjacent helmet piece portion in a circumferential direction so as to be easily deployed and stably maintain the shape during deployment. Folding helmet.

Preferably, the slide type connecting means includes a female type slide portion formed on an inner circumferential surface of one helmet piece portion in the circumferential direction, and a male type slide portion formed on an outer circumferential surface of the helmet piece portion adjacent inward to fit into the female type slide portion.

Preferably, in order to limit the rotation of the plurality of helmet segments, one helmet segment includes a stopper portion formed so as to close at least one end of both ends of the female slide portion in the inner circumferential surface.

More preferably, the helmet piece portion at the overlapped portion of the helmet piece portions is provided with a projection for preventing rainwater inflow from protruding along the meridional direction from the inner circumferential surface so as to block the gap between the deployed plurality of helmet piece portions to prevent inflow of rainwater .

More preferably, the helmet cut-in portion adjacent to the inside includes a groove for preventing rainwater inflow from being formed in a groove shape along the meridian direction on the outer circumferential surface so that the protruding portion for preventing inflow of rainwater from the overlapping portion of the helmet cut-

More preferably, the deployed plurality of helmet segments are in close contact with each other so that the rainwater inflow preventing protrusion and the rainwater inflow preventing groove are tightly coupled, .

More preferably, the first helmet segment is provided with a first engagement portion protruding from the inner circumferential surface of the first helmet segment segment and the last helmet segment segment overlapping each other so that the deployed plurality of helmet segment segments are maintained in a hat shape, And the second engaging portion is protruded from the outer circumferential surface to be engaged with the first engaging portion.

More preferably, the head detachable portions are provided inside the deployed plurality of helmet detachable portions so that the head straps can be detachably attached to the inner peripheral surface and the common axial portion of each helmet detachable portion.

According to the folding helmet of the present invention, since the plurality of helmet flakes can be easily expanded and collapsed, when the user does not use the helmet flakes, the helmet flaps can be folded in a sliding manner to greatly reduce the size, And a complete helmet formed by deploying a helmet at the time of use has the advantage that the user's head can be sufficiently protected in a dangerous environment.

1 is a perspective view showing a helmet according to the prior art;
FIGS. 2, 3A and 3B are a perspective view, a plan view and a bottom view showing a deployed state of the folding helmet according to the present invention
4 is a perspective view showing a folded state of the folding helmet according to the present invention.
5A and 5B are a side view and a rear view of the first helmet piece of the foldable helmet according to the present invention
6A, 6B, and 6C are a plan view, a front view, and a rear view, respectively, of the second helmet piece portion of the foldable helmet according to the present invention
7A and 7B are a front view and a rear view of the third helmet piece portion of the folding helmet according to the present invention
8A, 8B and 8C are a plan view, a front view and a rear view, respectively, of a fourth helmet piece of the folding helmet according to the present invention

Hereinafter, a folding helmet according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 2, 3a and 3b show the deployed state of the foldable helmet 1 according to the present invention, and FIG. 4 show the folded state of the foldable helmet according to the present invention. 5 to 8 show a first helmet flap 100, a second helmet flap 200, a third helmet flap 300 and a fourth helmet flap 400, which constitute the folding helmet according to the present invention. Respectively.

The foldable helmet 1 according to the present invention may include a plurality of helmet flaps 100, 200, 300, and 400 that are rotatably connected to each other on a common axis and are formed in a hat shape in a stepwise fashion.

First, the foldable helmet 1 is in the form of a hemispherical shape, and the helmet flakes 100, 200, 300, and 400 have a shape substantially similar to a portion defined by the lines extending from the ceiling of the hemisphere to the equator along the meridian .

That is, the helmet flakes 100, 200, 300, and 400 are in the form of a square when viewed from above, and the cross section along the meridian direction is a curved shape. In the present invention, as shown in the figure, each of the helmet segments 100, 200, 300, and 400 has a shape corresponding to one fourth of the hemispheres.

However, the number of the helmet segments and the relative sizes thereof are not limited to those shown in the figures. That is, it is needless to say that it can be formed differently from that shown as necessary. For example, in the case of a sports helmet for bicyclists and motorcycle drivers, it may be composed of two helmet segments with a half hemispherical shape. As such, the present invention includes various variations of the helmet segments.

Further, the helmet flakes 100, 200, 300, and 400 have a smaller radius as the helmet flakes near the center of the hemisphere are stacked so that the layers are stacked upon folding. The helmet segments 100, 200, 300, and 400 may be hinged or bolted to be rotatable on a common axis passing through the ceiling of the hemisphere.

At this time, it is preferable that each of the helmet segment parts 100, 200, 300, and 400 is formed of reinforced plastic or metal material which is a lightweight and highly rigid material. In addition, a special film (not shown) may be additionally attached to at least one of the inner circumferential surfaces 110, 210, 310, 410 and the outer circumferential surfaces 120, 220, 320, 420 of each helmet segment. For example, in the case of a military heading helmet, a film of a bulletproof material may be attached to the outer circumferential surface of each helmet piece to further protect the head from bullets.

Specifically, the foldable helmet 1 according to the present invention is in a folded state as shown in FIG. 4 when not in use. In detail, the fourth, third, and second helmet flakes 400, 300, and 200 are disposed in the deployed state as shown in FIG. 2 as the third, second, and first helmet flakes 300, 200 , 100), and is folded by rotating about the common axis. At this time, the helmet flakes have a structure in which the first, second, third and fourth helmet flakes 100, 200, 300 and 400 are laminated from the outside to the inside.

Meanwhile, the foldable helmet 1 according to the present invention is in an unfolded state as shown in Fig. In detail, the fourth, third and second helmet flakes 400, 300 and 200 are folded into the third, second and first helmet flakes 300, 200, 100 in the direction of the axis of rotation. At this time, the first, second, third and fourth helmet flakes 100, 200, 300 and 400 are developed in a stepped manner to form a complete helmet.

In this case, the counterclockwise direction of the foldable helmet 1 according to the present invention shows the developing direction of the helmet flake parts 100, 200, 300 and 400, and in the opposite direction, .

As described above, in the foldable helmet 1 according to the present invention, the helmet flakes 100, 200, 300, and 400 are deployed to form a complete helmet when used, thereby securing the safety of the user at a work site, The size of the helmet is reduced to one quarter of the size of the helmet by folding the helmet pieces so that the size of the helmet is considerably smaller than that of the general helmet.

In the foldable helmet 1 according to the present invention, a plurality of helmet flakes are formed on the inner circumferential surfaces 110, 210 and 310 of one helmet flake 100, 200, and 300 and helmet flutes 200 320, and 420 of the first, second, third, fourth, and fifth embodiments of the present invention may be slidably coupled along the circumferential direction.

In this case, one helmet flap 100, 200, 300 and the adjacent helmet flap 200, 300, 400 mean helmet flap pairs that are adjacent to each other, Relative to the adjacent helmet segment.

The inner circumferential surface 110 of the first helmet section 100 and the outer circumferential surface 220 of the second helmet section 200 and the inner circumferential surface 210 of the second helmet section 210 and the third circumferential surface 210 of the second helmet section 200, The outer circumferential surface 320 of the helmet segment 300 and the inner circumferential surface 310 of the third helmet segment are slidably connected to the outer circumferential surface 420 of the fourth helmet segment 400. [

Accordingly, the plurality of helmet flake parts 100, 200, 300, and 400 can be easily deployed, and the shape of the helmet flake parts 100 can be maintained stably during deployment. In addition, an impact from the outside can be obtained by transmitting the shock from the helmet 1 through the slide type connecting means without being directly transmitted to the head of the user.

Specifically, the slide-type connecting means may include female slide portions 112, 212, 312 and male slide portions 222, 322, 422.

The female type slide portions 112, 212 and 312 are formed in the circumferential direction on the inner circumferential surfaces 110, 210 and 310 of one helmet flake portion 100, 200 and 300 and the male type slide portions 222, 322 and 422, 320, and 420 of the helmet segment 200, 300, and 400, which are adjacent to each other, to be fitted into the female slide.

In the case of the present invention, as shown in FIG. 1, a female type slide portion in the form of a rail is formed in the lower part of the inner circumferential surfaces 110, 210 and 310 of the first, second and third helmet piece portions 100, (112, 212, 312) may be formed. Specifically, the female type slide portions 112, 212, and 312 in the form of a rail are configured such that grooves in the shape of 'ㅗ' or 'a' are formed in a cross section with respect to the longitudinal direction thereof.

Bolt or button-shaped male slide portions 222, 322, and 422 are formed on the lower portions of the outer circumferential surfaces 220, 320, and 420 of the second, third, and fourth helmet segment portions 200, 300, . Specifically, the male slide portions 222, 322, and 422 in the form of bolts or buttons are disposed near the trailing end in the rotational direction developed in the outer peripheral surfaces 220, 320, and 420 in consideration of slide displacement. The male type slide portions 222, 322 and 422 are formed of connecting portions connecting the head and the head to the outer circumferential surface. In this case, when the head is in the form of "ㅗ" or "a" Or " l "

As the bolt or button type male slide portions 222, 322 and 422 are inserted into the rail-shaped female slide portions 112, 212 and 312 and slide along the rails, the helmet piece portions 100, 200, and 300 are stably deployed and folded inwardly adjacent to the helmet segments 200, 300, and 400.

On the other hand, although not shown, the female type slide portion and the male type slide portion may be formed by changing positions. The male slide part is not limited to the bolt or button shape shown in the drawings, but may be a rail type that can be fitted to the female slide part, for example.

In order to limit the rotation of the plurality of helmet segments 100, 200 and 300, one helmet segment 100, 200, 300 may be formed on the inner circumferential surface 110, 210, 214, and 314 formed so as to cover at least one end portion of both ends of the first and second protrusions 212, 312.

The first helmet flap 100, the second helmet flap 300, and the third helmet flap 300 are formed on the inner circumferential surfaces 110, 210 and 310 at both ends of the female slide portions 112, 212 and 312, respectively, 114 ', 214, and 314 protruding from the outer circumferential surface of the protruding portion 114 to prevent the protruding portion 114'.

Accordingly, the second, third and fourth helmet flakes 200, 300, and 400 located relatively inward are respectively disposed on the outer sides of the first, second and third helmet flakes 100, 200, and 300, the inner helmet flap is blocked by the stoppers 114, 114 ', 214, and 314 of the outer helmet flap, so that the helmet flap does not come off the outer helmet flap.

More preferably, the stopper portion 114 'formed at the rear end portion of the stopper portions 114, 114' of the first helmet segment portion 100 with respect to the unfolding direction is provided with the second, The heights of the three helmet segments may be greater than the sum of the thicknesses of the three helmet segments to define the rotation of all of the segments 200, 300,

The helmet segments 200, 300, and 400 can be formed only when the helmet segments 200 are rotated in one direction, and a complete helmet can not be formed when the helmet segments 100 are rotated in the opposite direction. The stopper portion 114 'of the helmet 100 interrupts the rotation of the plurality of helmet piece portions in the opposite direction, thereby inducing the rotation expansion in only one direction.

In addition, the male slide portions 222, 322, and 422 are coupled to and separated from the female slide portions 112, 212, and 312 so that the helmet flakes 100, 200, 300, and 400 can be assembled and disassembled. The openings 115, 215, and 315 may be formed.

More specifically, as shown in the figures, the female slide portions 112, 212, and 312 are formed at least at the rear end portion with respect to the expanding direction so that the heads of the male slide portions 222, 322, And may have openings 115, 215, and 315.

Next, one of the helmet flaps 100, 200, and 300 located outside is provided with rainwater inflow preventing protrusions 116, 216, and 316 protruding from the inner circumferential surface of the overlapping portion of the helmet flap along the meridian direction can do.

Even when the helmet flakes 100, 200, 300 and 400 are deployed to form the helmet 1 in its entirety, there is a clear gap between the helmet flakes, so that the rainwater can flow inward when worn in the rain .

Accordingly, the rainwater inflow preventing protrusions 116, 216, and 316 are provided to prevent the inflow of rainwater by blocking the gap between the plurality of helmet flap sections 100, 200, 300, and 400 developed.

Specifically, as shown in the figure, the first, second and third helmet segment portions 100, 200 and 300 are arranged in a direction of meridional direction in the leading end portion in the direction of deployment of the helmet segment segments among the inner circumferential surfaces 110, 210, Or may be protruded along the longitudinal direction. At this time, the end portion includes a portion close to the end portion and the end portion, and is used in the same meaning throughout.

Accordingly, when the second, third and fourth helmet flakes 200, 300 and 400 are deployed with respect to the first, second and third helmet flakes 100, 200 and 300, respectively, As the rainwater inflow preventing projections 116, 216 and 316 of the second and third helmet flute sections are in close contact with the outer peripheral surfaces 220, 320 and 420 of the second, third and fourth helmet flute sections, A large part of the gap can be eliminated.

As described above, since the helmet flakes 100, 200, 300, and 400 have a smaller radius as the helmet flakes are closer to the center of the hemisphere, when the helmet flakes 100 are deployed, A gap is formed between the first helmet piece portion 400 and the fourth helmet piece portion 400.

Accordingly, in order to eliminate such a gap, the first helmet segment 100 may additionally have a portion extending inwardly at a portion overlapping the fourth helmet segment 400.

Specifically, as shown, the first helmet piece 100 may have an extension 117 protruding along the meridian direction in the entire trailing end portion with respect to the deployment direction.

The extended extension portion 117 may be formed in the same portion as the stopper portion 114 'of the first helmet segment 100 described above. In addition, the extension portion 117 may include a structure that functions as a rainwater inflow preventing protrusion or functions as such.

Preferably, the helmet flakes 200, 300, and 400 located relatively inwardly adjacent to the helmet flutes 100, 200, and 300 are arranged such that the meridian direction in the outer circumferential surface of the helmet flutes is overlapped And a rainwater inflow preventing groove portion 226, 326, and 426 formed in a groove shape.

At this time, the rainwater inflow preventing trenches 226, 326, and 426 are configured to be specifically fitted so as to correspond to the rainwater inflow preventing protrusions 116, 216, and 316.

3 and 4, the second, third, and fourth helmet segment portions 200, 300, and 400 may be arranged in the direction of meridional direction in the rear end portion of the outer peripheral surfaces 220, 320, Or may be formed in a groove shape that is long along the longitudinal direction.

Accordingly, when the second, third and fourth helmet flakes 200, 300 and 400 are deployed with respect to the first, second and third helmet flakes 100, 200 and 300, respectively, As the rainwater inflow preventing projections 116, 216 and 316 of the second and third helmet cutouts are coupled to the respective rainwater inflow preventing grooves 226, 326 and 426 of the second, third and fourth helmet cutouts, , It is possible to reliably prevent water from entering between the helmet segments.

At the same time, according to the combination of the rainwater inflow preventing protrusions 116, 216, 316 and the rainwater inflow preventing grooves 226, 326, 426, the adjacent helmet cutouts can be prevented from being excessively rotated and separated from each other That is, the helmet segments 100, 200, 300, and 400 deployed as a fastener can firmly maintain a complete helmet shape.

Although not shown in detail, the rainwater inflow preventing groove, to which the extension part 117 of the first helmet piece 100 or the rainwater inflow preventing protrusion formed thereon is coupled, is formed on the outer circumferential surface 420 of the fourth intercept part 400 May be additionally formed.

On the other hand, although not shown, in the case where the rainwater inflow preventing protrusion is used alone without the rainwater inflow preventing groove portion, the rainwater inflow preventing protrusion can be located at the position of the rainwater inflow preventing groove portion. Likewise, even when the projections for preventing inflow of rainwater and the grooves are used together, they can be formed by changing their positions. That is, it is recognized that such simple modifications are included in the scope of the present invention.

More preferably, the foldable helmet 1 according to the present invention includes connecting fastening means 500 provided to fasten the plurality of helmet piece portions 100, 200, 300, 400 in a common axis . For example, the tightening means for connection may be configured in a bolt manner, though not specifically shown.

The helmet flakes 100, 200, 300 and 400 are expanded to form a complete helmet 1 and then the plurality of helmet flakes are closely contacted with each other to tighten the connecting fastening means 500, The projections 116, 216, and 316 and the rainwater inflow preventing trenches 226, 326, and 426 are more tightly coupled.

Accordingly, the rainwater inflow preventing effect between the helmet flap sections 100, 200, 300, and 400 is further improved, and at the same time, the helmet type stability and robustness can be further improved.

The connection tightening means 500 may be more effective when used together with the rainwater inflow preventing protrusions 116, 216, and 316 and the groove portions 226, 326, and 426, Of course not. Even if it is used alone, some effect can be obtained.

The first helmet flap has a first engaging portion 118 protruding from the inner circumferential surface 110 and the last helmet flap has an outer circumferential surface 420 may be formed with a second engaging portion 428 protruding from the first engaging portion.

This is because the first helical portion 118 and the second helical portion 428 are engaged and fastened while the plurality of helmet flap portions 100, 200, 300, and 400 are deployed, It is.

Specifically, in the present invention, the first helmet segment 100, which is the first helmet segment, includes a first engagement portion 118 protruding from the rear end portion of the inner circumferential surface 110 in the deployment direction along the meridional direction or the longitudinal direction, Respectively.

The fourth helmet flake part 400, which is the last helmet flake part, is formed in a forward end portion in the developing direction of the outer circumferential surface 420 so as to extend along the meridional direction or the longitudinal direction, 2 latching portion 428 as shown in Fig.

Since the radius of the first helmet segment 100 to the fourth helmet segment 400 is reduced as described above, when the helmet segments 100, 200, 300, and 400 are deployed, A gap is formed between the flake section and the fourth helmet flake section.

Therefore, the first fastening portion 118 is formed so that the rear end portion of the inner circumferential surface 110 of the first helmet piece portion 100 in the unfolding direction is extended toward the inside of the hemisphere for engagement with the second fastening portion 428 It is preferable that it is formed in the portion 117.

Next, the foldable helmet 1 according to the present invention is constructed by arranging the inner circumferential surfaces 110, 210, 310, and 410 of the respective helmet piece portions and the common axial portion 110 of the helmet piece portions 100, 200, 300, 230, 330, 430, and 530 provided to allow the head strap to be detachably attached to the head strap.

The foldable helmet 1 according to the present invention constitutes the outside of the helmet, and a head strap is to be mounted inside the helmet so as to be placed on the user's head.

To this end, one or more head strap attaching / detaching portions (not shown) may be disposed on the inner circumferential surfaces 110, 210, 310 and 410 of the respective helmet flap sections 100, 200, 130, 230, 330, and 430 may be provided. These hair-cord attaching / detaching portions 130, 230, 330, and 430 are formed in the form of bolts or buttons, and the head strap is hooked and fixed to the head portion of the hair-

In detail, as shown in the figure, the inner helmet flakes 200, 300 and 400 are slidable inwardly of the outer helmet flakes 100, 200 and 300, It is preferable that the head strap detachable parts 130, 230 and 330 of the piece section are mounted on the head strap detachable part groove sections 132, 232 and 332 formed on the inner peripheral surfaces 110, 210 and 310. More preferably, the head strap detachable parts 130, 230 and 330 of the first, second and third helmet flute parts 100, 200 and 300 are configured not to project from the inner circumferential surfaces 110, 210 and 310 .

On the other hand, the head detachable part 430 of the fourth helmet flake part 400 does not interfere with slide folding of the plurality of helmet flake parts 100, 200, 300 and 400, and may be formed so as to protrude.

Further, a head strap detachable portion 530 may be further provided on the common shaft portion so as to detachably fix the upper portion of the head strap. The head detachable portion 530 may be formed as a 'C' shape having one side opened as shown in the figure. Accordingly, the head strap can be mounted and separated through the opened portion.

Next, the folding helmet 1 according to the present invention may include a portable ring 140 formed on a common shaft portion of the first helmet piece 100 to facilitate carrying. As shown in the figure, the first helmet segment 100 may include a portable annulus 140 formed in a ring shape on a common axis portion.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be appreciated that those skilled in the art will readily understand the present invention.

1 ... folding helmet
100, 200, 300, 400 ... helmet piece
110, 210, 310, 410 ... inner circumferential surface of the helmet section
112, 212, 312 ... female slide portion
114, 214, 314 ... stopper portion
116, 216, 316 ... protrusions for preventing inflow of rainwater
118, 428 ... engaging portion
120, 220, 320, 420 ... outer circumferential surface of the helmet section
222, 322, 422 ... male slide portions
226, 326, 426 ... rainwater inflow preventing groove
500 ... connection tightening means

Claims (8)

A foldable helmet (1) having a plurality of helmet flakes (100, 200, 300, 400) connected rotatably on a common shaft and formed in a hat shape in a stepwise manner,
The plurality of helmet segments 100, 200, 300, and 400 may be formed on the inner circumferential surfaces 110, 210, and 310 of one helmet segment 100, 200, and 300 so as to be easily deployed, And sliding connection means for slidably connecting the outer circumferential surfaces (220, 320, 420) of the helmet segment portions (200, 300, 400) adjacent thereto in the circumferential direction.
The method according to claim 1,
The slide type connecting means includes female slide portions 112, 212 and 312 formed in the circumferential direction on the inner circumferential surfaces 110, 210 and 310 of the one helmet slice portion 100, 200 and 300, 322, 422 formed on outer peripheral surfaces (220, 320, 420) of the slice parts (200, 300, 400) so as to fit into the female slide part.
3. The method of claim 2,
In order to limit the rotation of the plurality of helmet segments 100, 200, 300, 400, the one helmet segment 100, 200, 300 may be formed on the inner circumferential surface 110, 210, And stoppers (114, 214, 314) formed so as to close at least one end portion of both ends of the first and second end portions (112, 212, 312).
4. The method according to any one of claims 1 to 3,
In order to prevent the inflow of rainwater by blocking a gap between the plurality of helmet flakes 100, 200, 300, and 400 developed, the one helmet flakes 100, 200, and 300, at the overlapped portion of the helmet flakes, And a rainwater inflow preventing protrusion (116, 216, 316) protruding from the inner circumferential surface (110, 210, 310) along the meridian direction.
5. The method of claim 4,
The inner helmet flakes 200, 300 and 400 are formed on the outer circumferential surface of the helmet flap 100, 200, 300 and 400 so that the rainwater inflow preventing protrusions 116, 216 and 316 are fitted in the overlapping portions of the helmet flap 100, 326, and 426 formed in a groove shape along the direction of the meridian line in the direction of the meridian.
6. The method of claim 5,
216 and 316 and the rainwater inflow preventing grooves 226, 326, 426 are tightly engaged with each other so that the helmet flakes 100, 200, 300, 400 are brought into close contact with each other to be tightly engaged with the rainwater inflow preventing protrusions 116, And a connection tightening means (500) provided to connect the plurality of helmet piece parts in a tightening manner on a common axis.
The method according to claim 1,
In a portion where the first helmet flake 100 and the last helmet flake 400 are overlapped so that the helmet flakes 100, 200, 300 and 400 are maintained in a hat shape, The first helmet piece has a second hook portion 428 protruding from the outer circumferential surface 420 so as to be engaged with the first hook portion. A folding helmet.
The method according to claim 1,
A head strap is detachably provided on the inner circumferential surfaces (120, 220, 320, 420) and the common shaft portion of each of the helmet segment portions inside the plurality of helmet segment portions (100, 200, 300, 400) (130, 230, 330, 430, 530). ≪ / RTI >

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