JP2009108428A - Helmet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a helmet that sufficiently secures width of a protective shield and has a high wearing stability with a simple structure. <P>SOLUTION: A U-shaped latching pin 8 and a U-shaped engaging projection part 9 are integrally formed on both sides of the inside of an approximately hemispherical helmet body 2 of the helmet 1. A pair of a hole part and an engaging hole part of a guide sheet 3 are engaged and fixed on a pair of the latching pin 8 and the engaging projection part 9. Between the guide sheet 3 and the helmet body 2, the protective shield 5 is movably arranged between the two engaging projection parts 9 and 9. The guide sheet 3 is equipped with a pair of second latching pins 15 inside the engaging hole part. The second latching pin 15 and the latching pin 8 are equipped with four support bands 20 of a hammock 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a helmet provided with a protective shield that is provided in a helmet main body so as to be able to advance and retreat, and protects a user's face.

Conventionally, there is a helmet described in Patent Document 1 as a helmet having this type of protective shield.
This helmet has a headband that covers the entire circumference of the user's head and whose inner diameter can be adjusted according to the size of the user's head, and a circumferential direction (helmet body so as to cover the front side of the head Plate-like shield box formed along the inner surface of the helmet body, and a plate-shaped anti-impact reinforcement that is attached to the shield box and curved along the upper part of the inner surface of the helmet body A support arm, a shield plate attached to the shield box so as to be able to move forward and backward, a mounting band fixed to the shield box so as to cover the back of the user's head, and a band portion attached to the shield box and the headband Hammock.

In such a helmet, the attachment band is fixed to the rear part of the inner surface of the helmet body with rivets, and the shield box is fixed to the front part of the inner surface of the helmet body with rivets. The hammock is locked to the mounting band and the shield box. A gap for moving the shield plate back and forth is formed between the shield box and the inner surface of the helmet body.
The shield plate is attached to a guide groove provided in the shield box, and is configured to advance and retreat in and out of the helmet body along the guide groove. The shield plate covers and protects the user's face by being pulled out of the helmet body from the retracted position stored in the helmet body.

Moreover, in the helmet with a face protection board described in patent document 2, the shock absorption liner is provided in the inner surface of the cap body, and the hammock is provided in the inner side. A face protection plate assembly comprising a cap body, a support plate attached to the hammock, and a face protection plate is provided between the front portions of the shock absorbing liner and the hammock. A fixing tool for fixing the hammock to the inner surface of the cap body is provided at the end of the support plate. A headband is detachably attached to the lower part of the hammock.
Then, the face protection plate is engaged with the engagement member of the face protection plate from a position far from the face in a state where the face protection plate is retracted from the cap body and pulled out to the front part outside the cap body to hold the user's face. By bending the support plate, it can be set in three stages up to a position relatively close to the face.
Japanese Patent No. 2916140 JP 2003-49316 A

However, the above-described helmet is provided with a shield plate that can be moved forward and backward in the gap between the shield box and the helmet body, so that the shield box to which the support band on the front side of the hammock is fixed is attached to both ends of the shield plate in the width direction. It is necessary to adhere to the helmet body at both end positions closer to the side of the helmet body than the (end part). In such a case, since the width of the front side of the shield box that forms a gap on the inner side in the width direction than the fixed end positions is wide, the width of the portion of the shield box that is not fixed to the helmet body is wide. Thus, there is a problem that the shield box wobbles, and there is a problem that the hammock supported by the shield box wobbles.
Also, in the helmet described in Patent Document 2, the support plate is fixed to the hammock, and the hammock is fixed to the inner surface of the cap body by fixtures on both sides, and both ends forming a width wider than the width of the face protection plate. Hammock had to be fixed to the inner surface of the cap body at the part.
For this reason, if the protective shield such as the seal plate or the face protection plate is set wide enough to protect the user's face sufficiently, the space between the mounting positions of the hammock support band becomes wider and the front side portion of the helmet becomes wobbled. The mounting stability becomes insufficient, and the user's head may not be suitably protected.

  In view of such a situation, an object of the present invention is to provide a helmet capable of securing a sufficient width of a protective shield and obtaining high wearing stability.

A helmet according to the present invention includes a substantially hemispherical helmet body, a hammock having a plurality of support bands extending radially from a central portion in the helmet body, a guide sheet provided at least in front of the helmet body, The helmet is equipped with a protective shield that can be moved back and forth by being guided by a guide sheet between the outer surface and the outside, and that protects the user's face at a position where the user has advanced to the outside. And a plurality of engaging portions for locking the guide sheet, and the protective shield can be advanced and retracted between the two engaging portions. According to the helmet of the present invention, the guide sheet can be attached to the helmet body by the locking portion and the engaging portion. The mounting strength is high and the mounting stability is high. Moreover, since the protective shield can be moved back and forth between the two engaging portions provided on the helmet body between the helmet main body and the guide sheet, the width of the protective shield can be set by the interval between the two engaging portions. A sufficient width can be secured to protect the face. Further, the locking portion provided on the helmet body can lock the guide sheet and also the hammock support band, which helps to reduce the number of parts.

  According to the helmet of the present invention, since the lock body and the engagement portion are provided in the helmet body and the guide sheet is fixed, the attachment strength and the mounting stability of the guide sheet with respect to the helmet body are high. Not only the seat but also the hammock support band can be locked, which helps to reduce the number of parts. In addition, since the width of the protective shield that is guided by the guide sheet and advances and retracts can be set by the interval between the two engaging portions, a sufficient and sufficient width can be secured to protect the user's face, and the protective shield Even if the interval between the two engaging portions for setting the width is set wide, the guide sheet is attached to the engaging portion and the engaging portion, so that the mounting stability can be maintained high without reducing the attachment strength of the guide sheet.

In the helmet according to the present invention, the engaging portion has a shape having a bent portion or a curved portion, and the engaging portion and the guide sheet are on the same surface or the same surface in a state of being engaged with the engaging hole portion formed in the guide sheet. It is preferable to be close to the position.
By making the engaging portion into a shape having a bent portion or a curved portion, it is possible to provide a high strength that is difficult to come off in a state of being fitted to the engaging hole portion of the guide sheet having a similar shape. In addition, by connecting a rib or the like in the vicinity of the engaging portion, the height of the fitted guide sheet and the engaging portion is on the same surface or close to the same surface. It can be formed, and the engaging portion does not come into contact with the head of the user wearing the helmet to feel discomfort or pain.

Further, the guide sheet may be provided with a second locking portion for locking the support band of the hammock.
By providing the second locking portion on the guide sheet, the second locking portion can be provided at any position regardless of the position and width of the protective shield. Even in this case, the hammock and the guide sheet There is no wobbling or the like, the wearing stability is high, and the user's head can be suitably protected.
Moreover, it is preferable that the 2nd latching | locking part provided in the guide sheet is provided in the circumferential direction center side rather than the engagement hole part.
By adopting such a configuration, the support band of the hammock can be placed in a suitable position balanced with respect to external impact and head load without being restricted by the engaging portion to which the guide sheet is attached. It can be attached to the two locking portions, and the mounting stability of the guide sheet and hammock can be ensured.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 is an exploded perspective view of a helmet according to the embodiment, FIG. 2 is a partially broken plan view of the inner surface of the helmet excluding the hammock, FIG. 3 is a partial plan view of the inner surface and the outer surface of the helmet, and FIG. 5A is a horizontal sectional view taken along line AA of the engaging portion shown in FIG. 3, FIG. 5B is a vertical sectional view taken along line BB shown in FIG. 4, and FIG. 6 is a plan view of the guide sheet. 7 (a) and 7 (b) are a cross-sectional view and a horizontal cross-sectional view taken along the line C-C of the second locking pin shown in FIG. 6, FIG. 8 and FIG. FIG. 11 is a sectional view taken along line DD and EE of the protective shield shown in FIG. 8, FIG. 11 is a plan view of the stopper, a side view, a central longitudinal sectional view, and FIG. It is a principal part longitudinal cross-sectional view.
A helmet 1 according to the present embodiment is used, for example, at a security or construction site. For example, as shown in FIG. 1, a helmet body 2 having a substantially hemispherical shape and a guide sheet 3 mounted inside the helmet body 2 are used. And a hammock 4 for absorbing an impact applied to the helmet body 1 and a protective shield 5 attached to the guide sheet 3 so as to be able to advance and retreat and for protecting the user's face at the advanced position. Moreover, you may provide the protective film 6 in the guide sheet 3 so that a user's hair may not get entangled.

The helmet body 2 is formed of an ABS resin such as acrylonitrile butadiene styrene copolymer, for example, and the front side of the helmet body 2 protrudes forward so as to protect the user's face from rain and falling objects. 2a is provided. In the present specification, the front side refers to the direction in which the user faces the face while wearing the helmet 1, and the rear side and the rear refers to the direction of the back of the head.
As shown in FIGS. 2 to 5, the helmet body 2 has a pair of locking pins 8 and 8 integrally formed as a locking portion on the rear side on the peripheral edge 2 c side of the inner surface 2 </ b> B. On the front side, for example, a pair of substantially convex U-shaped projections 9 and 9 are integrally formed as an engagement portion. The locking pins 8 and 8 and the engaging projections 9 and 9 are arranged in line symmetry with respect to the center line O in the direction orthogonal to the flange 2a on the inner surface 2B of the helmet body 2 (see FIG. 2). ).
As shown in FIG. 4, each locking pin 8 has a substantially U shape in plan view, a base portion 8 a having a wide width is formed on the inner surface 2 </ b> B side, and a diameter thereof is reduced from the base portion 8 a in the same shape above. A stop receiving portion 8b and a flange portion 8c slightly wider than the locking receiving portion 8b are sequentially formed. As shown in FIG. 4, the latch receiving portion 8b is cut out in a tapered shape with both ends of a substantially U shape facing upward, and the flange portion 8c located at the top is shorter than the base portion 8a.
4 and 5 are substantially U-shaped in plan view, and a plurality of ribs 9a and 9b having a height lower than that of the engaging convex portion 9 are integrally formed on both the inner and outer sides thereof. .

As shown in FIGS. 2 and 6, the guide sheet 3 attached to the peripheral edge 2c of the inner surface 2B of the helmet body 2 is an approximate line in which narrow wing portions 3b and 3b are extended from the wide body portion 3a to both sides. It has a symmetrical wing shape. A hole 12 that fits into the base 8a of the locking pin 8 is perforated at the end of each wing 3b, and the inner side of the hollow window is sandwiched between the engagement projections 9. A U-shaped engagement hole 13 is perforated.
In a fixed state in which the guide sheet 3 is fitted to each locking pin 8 and the engaging convex portion 9, both side edges of the engaging hole portion 13 having a substantially U-shape ride on the ribs 9a and 9b. In this region, the wings 3b, 3b of the guide sheet 3 are held at a level substantially the same as or slightly lower than the tops of the engaging protrusions 9, 9, and the engaging protrusions 9 on the user's head when worn. The top of 9 protrudes to prevent discomfort and pain. Further, the structure in which the guide sheet 3 rides on the ribs 9a and 9b forms a thin layer gap in which a protective shield 5 described later slides between the guide sheet 3 and the helmet body 2.
A guide hole 14 is formed in the main body 3a of the guide sheet 3 in a direction intersecting with the wing 3b. For example, three guide holes 14 including a central guide hole 14a and side guide holes 14b and 14b on both sides thereof are arranged at a predetermined interval. Each guide hole 14a, 14b is formed with a wide hole 14ab, 14bb at the end in the back direction on the inner surface 2B of the helmet body 2. A stepped stopper hole 14ac is further provided in the wide portion 14ab of the central guide hole 14a.
Further, second locking pins 15 and 15 are provided as second locking portions for locking the hammock 4 on the main body 3a side (inside) of the U-shaped engagement hole 13 in the wing portion 3b. Is provided. The second locking pin 15 has the same shape as the locking pin 8 except for the base portion 8a (see FIG. 7). The guide sheet 3 is also formed in line symmetry.

The protective shield 5 shown in FIGS. 8 and 9 is a transparent or semi-transparent member made of, for example, polycarbonate, and is curved in a convex arc shape. The protective shield 5 is engaged with the central guide hole 14 a of the guide sheet 3 and the side guide holes 14 b and 14 b on both sides of the guide sheet 3. The protective shield 5 is retracted inside the helmet body 2 and protrudes outside the helmet body 2. It can slide back and forth along the guide holes 14a and 14b between the positions.
Therefore, in FIG. 8, a central sliding projection 17 that engages with the central guide hole 14a is formed at one end of the protective shield 5 at the center in the width direction, and side sliding projections 18 and 18 are formed on both sides thereof. Has been. As shown in FIGS. 9 and 10, the central sliding protrusion 17 has a substantially U-shape that is notched on both sides of the main body of the protective shield 5 and protrudes in the curved direction, and extends outward from both ends of the U-shape. A protruding collar is formed. The side sliding projection 18 is formed by forming a notch in the main body of the protective shield 5 and projecting in a substantially L shape in the bending direction.

  The protective shield 5 is attached to the main body 3a between the helmet main body 2 and the guide sheet 3 in a state where the guide sheet 3 is attached to the front side of the helmet main body 2 with the locking pin 8 and the engaging convex portion 9. It is done. In the main body 3a, the central sliding projection 17 of the protective shield 5 is inserted inwardly from the wide hole 14ab of the central guide hole 14a, and the U-shaped cross section shown in FIG. 10 slides on both side edges of the central guide hole 14a. It is supported movably. Further, the side sliding convex portion 18 is also inserted from the wide portion 14bb of the side guide hole 14b, and the substantially L-shaped cross section shown in FIG. 10 is slidably supported on both side edges of the side guide hole 14b. . Therefore, the protective shield 5 is guided by the guide holes 14a and 14b so that the protective shield 5 can move forward and backward with respect to the face of the user wearing the helmet 1 on the front side of the helmet body 2, and the protective shield 5 The side sliding convex portion 18 can be held in a frictionally locked state at an arbitrary position of the central guide hole 14a and the side guide hole 14b.

Next, the hammock 4 shown in FIG. 1 is formed of, for example, polyethylene, and a plurality of support bands arranged radially at predetermined intervals in the circumferential direction from the central portion 4a in contact with the top of the user's head. 20 is formed. Further, in the hammock 2, a substantially bowl-shaped through-hole 21 a is drilled in a connecting portion 21 provided on the outer surface (the surface facing the inner surface 2 </ b> B side of the helmet body 2) at the lower end of each support band 20.
In this embodiment, four support bands 20 are provided, and the adjacent support bands 20 are arranged so as to extend in a substantially cross shape so as to form an angle of approximately 90 degrees. The through holes 21a of the four support bands 20 of the hammock 4 are respectively attached to the latch receiving portions 8b and 8b of the latch pins 8 and 8 provided on the rear side of the inner surface 2B of the helmet body 2 and the front side of the inner surface 2B. It will be respectively engaged with the 2nd locking pins 15 and 15 provided in each wing part 3b of guide sheet 3.
The four support bands 20 are arranged on substantially the same straight line so as to form a substantially cross shape from the central portion 4a, so that the impact force acting on the helmet body 2 is reliably received by the hammock 4, and the user's head Protect parts.

Further, in the hammock 4 formed in this way, a fixed band 23 branched from an intermediate portion of each support band 20 is integrally connected to a substantially annular headband 24. The headband 24 covers the head so as to surround the entire circumference of the user's head, and is for securing the wearing stability of the helmet 1 together with the hammock 4. It is configured so that each user with a different head size can use the same helmet 1 by adjusting in (1). The headband 24 may not be provided.
Further, the protective film 6 shown in FIG. 1 has a pair of holes 6a and 6a formed on both sides of the lower part thereof. With the protective film 6 disposed so as to cover the guide holes 14a and 14b of the guide sheet 3 attached to the helmet body 2, the holes 6a and 6a are fitted into the second locking pins 15 and 15, By attaching the hammock 4 on the top, the helmet body 2 is held on the inner surface.

Next, a stopper 26 that accommodates and holds the protective shield 5 in the helmet body 2 will be described with reference to FIGS. 11 and 12.
As shown in FIGS. 11A to 11C, the stopper 26 is, for example, a substantially rectangular plate shape, and a locking piece 26 a to the central sliding protrusion 17 is formed at one end, and the central portion A stopper portion 26b that fits into the stopper hole 14ac of the central guide hole 14a is formed, and a holding portion 26c that is curved on the opposite side of the locking piece 26a and the stopper portion 26b is provided at the other end.
In the retracted position where the protective shield 5 is housed in the helmet body 2, the central sliding projection 17 of the protective shield 5 is located in the wide hole 14ab of the central guide hole 14a, and the side sliding convex portions 18 on both sides, Similarly, 18 is located in the wide hole 14bb of the side guide holes 14b and 14b. In this state, as shown in FIG. 12, the locking piece 26a is locked to the central sliding protrusion 17, and the stopper 26a is placed in the wider stopper hole 14ac adjacent to the wide hole 14ab of the central guide hole 14a. The protective shield 5 can be fixed to the guide sheet 3 by inserting the stopper portion 26b. At this time, since the stopper portion 26b engaged with the stopper hole 14ac is wider than the wide hole 14ab of the central guide hole 14a, the stopper 26 and the protective shield 5 are not detached or displaced.
The stopper 26 is fixed to the guide sheet 3 by fitting the stopper portion 26b into the stopper hole 14ac. The protective shield 5 is not used, and the central sliding protrusion 17 is engaged with the locking piece 26a. By holding the protective shield 5 out of the helmet body 2 during use, the stopper 26 is elastically deformed and detached from the engaging piece 26a. When the protective shield 5 is housed in the helmet body 2 from the used state, the central sliding projection 17 that reaches the wide hole 14ab by pushing the protective shield 5 into the retracted position locks the stopper 26 that is elastically deformed. Over the piece 26a, the engaging piece 26a is engaged with each other.
The protective shield 5 is held at an arbitrary position by frictionally locking the central sliding projection 17 and the side sliding projection 18 to both side edges of the guide holes 14a and 14b of the main body 3a. It will not slide unless a load is applied.

The helmet 1 according to the present embodiment has the above-described configuration. Next, a method for assembling the helmet 1 will be described.
First, the central sliding hole 17 and the side sliding convex part of the protective shield 5 are provided in the central guide hole 14a provided in the main body 3a of the guide sheet 3 and the wide holes 14ab, 14bb and 14bb of the side guide holes 14b and 14b. 18 and 18 are positioned, and the center sliding protrusion 17 is fitted to the stopper 26.
Next, the guide sheet 3 is mounted on the front side of the inner surface 2B of the helmet body 2, and the pair of holes 12, 12 and the engagement holes 13, 13 of the wing portions 3b, 3b on both sides are connected to the inner surface 2B of the helmet body 2. The pair of locking pins 8 and 8 and the substantially U-shaped engaging projections 9 and 9 are fitted and locked. At this time, the locking pin 8 fits the hole 12 of the wing 3b to the base 8a.
In this state, the protective shield 5 slides along the guide holes 14a and 14b between the retracted position housed on the inner surface 2B of the helmet body 2 and the advanced position lowered to the outside of the helmet body 2. It becomes possible.
In the state where the protective shield 5 is housed in the helmet body 2, the central sliding protrusion 17 is locked by the stopper 26 in the protective shield 5 in the retracted position.

Next, the hammock 4 is attached to the helmet body 2. The connecting portions 21 of the pair of support bands 20 and 20 on the rear side of the hammock 4 are engaged with the locking receiving portions 8b and 8b of the locking pins 8 and 8 provided on the inner surface 2B of the helmet body 2 through the through holes 21a. . Further, the connecting portions 21 of the pair of support bands 20, 20 on the front side of the hammock 4 are engaged with the second locking pins 15, 15 of the guide sheet 3 through the through holes 21 a.
In this way, the helmet 1 is obtained.
In order to prevent the hair from getting entangled between the sliding projections 17 and 18 and the guide holes 14a and 14b when the user wears the helmet 1 and moves the protective shield 5 forward and backward, A protective film 6 may be attached to the surface of the portion 3a.

As described above, the helmet 1 according to the present embodiment has the following effects.
(1) When the guide sheet 3 is locked to the inner surface 2B of the helmet body 2, the pair of hole portions 12 provided in the wing portions 3b and 3b on both sides and the substantially U-shaped engagement hole portions 13 are Since it is a four-point support structure fitted to each pair of substantially U-shaped locking pins 8 and a substantially U-shaped engaging convex portion 9 formed integrally with 2B, Even if the second locking pin 15 for the hammock 4 is provided, the guide sheet 3 and the hammock 4 do not wobble, and it is difficult to come off and stable mounting performance can be exhibited.
(2) The guide sheet 3 attached to the front side of the inner surface of the helmet body 2 is provided with second locking pins 15 and 15 for attaching a hammock, and has a substantially U-shape attached to the outside of the second locking pin 15. Since the engagement hole 13 of the guide sheet 3 is mounted on the engagement protrusions 9, 9, the width of the protective shield 5 that moves forward and backward between the guide sheet 3 and the inner surface 2 B of the helmet body 2 is set to the engagement protrusion 9, Since it can be formed widely up to a width of 9 and is not restricted by the locking pins 15, 15, the user's face can be sufficiently protected.
(3) Since the mounting position of the support band 20 is not limited by the position of the protective shield 5, such as forming the support band 20 of the hammock 4 in a substantially cross shape, the mounting stability and strength of the hammock 4 are high and impact resistance. Is also expensive.
(4) When the guide sheet 3 is fitted to the engagement convex portion 9, the substantially U-shaped engagement hole portion 13 is fitted, so that the mounting strength of the guide sheet 3 is high and is difficult to come off. In addition, since the front and rear edges of the engagement hole 13 drilled in the guide sheet 3 ride on and are locked on the ribs 9a and 9b, respectively, the guide sheet 3 is substantially flush or flush with the top of the engagement projection 9. Therefore, the engaging convex portion 9 does not come into contact with the user's head to cause discomfort or pain. Moreover, a gap in which the protective shield 5 slides can be formed between the guide sheet 3 and the helmet body 2 by the ribs 9a and 9b, and the protective shield 5 can be smoothly slid in a small space.
(5) The locking pin 8 formed integrally with the helmet body 2 has the hole portion 12 of the wing portion 3b of the guide sheet 3 fitted into the base portion 8a, and the connection portion of the support band 20 of the hammock 4 to the locking receiving portion 8b. Since the two types of members are locked in two stages formed by fitting the through holes 21a provided in 21, the guide sheet 3 and the hammock 4 can be securely held, and the number of parts can be reduced and the cost can be reduced. It becomes cheap.

In addition, the helmet 1 by this invention is not limited to the above-mentioned Example, It can change suitably in the range which does not deviate from the meaning.
For example, in the present embodiment, the engaging convex portion 9 and the engaging hole portion 13 of the guide sheet 3 that are fitted to each other are formed in a substantially U-shape, but are not limited to such a configuration, for example, What is necessary is just to set it as the structure which has bending parts and curved parts, such as a substantially L shape, U shape, and V shape, and can engage with the helmet main body 2 and the guide sheet 3 reliably and firmly.
Further, the ribs 9a and 9b connected to the engaging convex portion 9 may be simple protrusions, or may be separated from the engaging convex portion 9 and disposed in the vicinity. In short, when the engagement hole 13 of the guide sheet 3 is fitted to the engagement protrusion 9, the guide sheet 3 is flush with the top of the engagement protrusion 9 or at a height close to the same. That's fine.

In this embodiment, the hammock 4 is formed with four support bands 20, but the present invention is not limited to this. For example, six or eight support bands 20 may be provided. . In this case, in the embodiment, the second locking pin 15 is provided on the guide sheet 3 and the two support bands 20 are attached. However, three or more support bands 20 are provided according to the number of the support bands 20. Three or more second locking pins 15 may be provided on the guide sheet 3 so as to be attached. Moreover, the latching pin 8 attached to the helmet main body 2 integrally can also be set to arbitrary numbers.
In the above-described embodiment, the second locking pin 15 is provided on the inner side of the engagement hole 13 in the guide sheet 3, but the attachment position of the second locking pin 15 is arbitrary, and the engagement hole 13 The second locking pin 15 may be provided on the outside or at the same position.

1 is an exploded perspective view of a main part of a helmet according to an embodiment of the present invention. It is a partially broken top view of the inner surface of a helmet except a hammock. It is a top view which shows a helmet inner surface and an outer surface about half each. It is the elements on larger scale of the inner surface of a helmet body. (A) is the AA line horizontal sectional view of the engaging convex part shown in FIG. 3, (b) is the BB line longitudinal cross-sectional view of the engaging convex part shown in FIG. It is a top view of a guide sheet. FIG. 7 is a longitudinal cross-sectional view and a horizontal cross-sectional view of the second engagement pin shown in FIG. It is a top view of a protective shield. It is a center longitudinal cross-sectional view of the protective shield shown in FIG. It is the DD sectional view taken on the line of the center sliding convex part in FIG. 8, and the EE sectional view taken on the line of the side sliding convex part. The stopper is shown, (a) is a plan view, (b) is a side view, and (c) is a longitudinal sectional view taken along line FF. It is a principal part longitudinal cross-sectional view of the state which made the stopper fit in the center sliding convex part of a protective shield.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Helmet 2 Helmet main body 3 Guide sheet 4 Hammock 5 Protective shield 6 Protective film 8 Locking pin 9 Engaging convex part 9a, 9b Rib 12 Hole 13 Engaging hole 15 Second locking pin 14a Center part guide hole 14b side Part guide hole 17 Central sliding convex part 18 Side sliding convex part 26 Stopper

Claims (4)

A substantially hemispherical helmet body, a hammock having a plurality of support bands extending radially from a central portion in the helmet body, a guide sheet provided at least in front of the helmet body, and the inside and outside of the helmet body A helmet equipped with a protective shield that is guided by the guide sheet between and can be advanced and retracted and protects the user's face at a position advanced to the outside,
An inner surface of the helmet body includes a locking portion that locks both the guide sheet and the hammock, and a plurality of engaging portions that lock the guide sheet. A helmet characterized in that the protective shield can be advanced and retracted.   The engaging portion has a shape having a bent portion or a curved portion, and the engaging portion and the guide sheet are located on the same surface or close to the same surface in a state of being engaged with an engaging hole formed in the guide sheet. The helmet according to claim 1, wherein:   The helmet according to claim 1 or 2, wherein the guide sheet is provided with a second locking portion that locks a support band of the hammock.   The helmet according to claim 3, wherein the second locking portion is provided closer to the center side in the circumferential direction of the guide sheet than the engagement hole portion.

Images