JP2022129389A - helmet face shield - Google Patents

Abstract

To provide a face shield where a connecting portion with a helmet is arranged at a pivot point of a fan, which is a fan-shaped face shield that can be pivotally attached to the helmet when viewed from a side, wherein when a firefighter who wears a self-contained breathing apparatus face piece wears a helmet with a face shield, a downward swing range of the face shield stored in the helmet is wider than before.SOLUTION: There is provided a face shield that is swingably attached to a helmet and has a generally fan-shaped side view, and has a connecting portion with the helmet at a pivot point of the fan, wherein it is divided into a pair of a first portion and a second portion including the connecting portion in the vicinity of the connecting portion, and an upper portion of the second portion adjacent to the first portion is swingably connected to the first portion.SELECTED DRAWING: Figure 5

Description

The present invention relates to a face shield that is pivotally attached to a helmet.

As shown in FIG. 1, a face shield that is swingably attached to a helmet and has a substantially fan-like shape when viewed from the side includes a front portion 1a that is convexly curved forward and a pair of extensions that extend rearward from the side edges of the front portion 1a. Patent Document 1 discloses a face shield 1 in which a pair of connecting portions 1c with a helmet are arranged at pivotal positions of the fans, which are the rear end portions of the pair of extension portions 1b. The lower edge and the side edges of the front surface portion 1a form a flange 1d protruding in the out-of-plane direction.

JP 2019-203225 A

As shown in FIG. 2, the face shield 1 of Patent Document 1 is attached to a helmet 4 used by a firefighter wearing a face piece 3 of a self-contained respirator connected to an air cylinder (not shown) through an intake pipe 2. It can be attached.
As shown in FIG. 2, when the face piece 3 of the self-contained breathing apparatus is worn on the face, the front end 3a of the face piece 3 connected to the inspiratory pipe 2 protrudes forward and downward. Therefore, when a firefighter wearing a facepiece 3 of a self-contained respirator on his face puts on a helmet 4 with a face shield 1, the face shield 1 stored in the helmet 4 is swung downward so that the self-contained respirator can be used. When covering the front surface of the face piece 3, as shown in FIG. 3, the flange 1d at the lower edge of the front surface portion 1a of the face shield 1 interferes with the front end portion 3a of the facepiece 3 of the self-contained breathing apparatus, causing it to swing downward. is obstructed and the field of view of the face shield 1 is narrowed.
The present invention has been made in view of the above problems, and is a face shield that is swingably attached to a helmet and has a generally fan-shaped side view, in which a connecting portion with the helmet is arranged at a pivotal position of the fan. In the face shield, when a firefighter wearing a facepiece of a self-contained breathing apparatus on his face wears a helmet with a face shield, the face shield stored in the helmet has a wider swing range downward than before. intended to provide

In order to solve the above-mentioned problems, the present invention provides a face shield that is swingably attached to a helmet and has a substantially fan shape in a side view, wherein the face shield is provided with a connection portion with the helmet at a pivotal position of the fan. is divided into a pair of a first portion including the connecting portion and a second portion in the vicinity of the connecting portion, and an upper portion of the second portion adjacent to the first portion is swingably connected to the first portion To provide a face shield characterized by:
The lower edge of the face shield is lifted by swinging the second portion, whose upper portion adjacent to the first portion is swingably connected to the first portion, in a direction in which the lower portion of the second portion separates from the first portion. You can pull it forward. The facepiece of the self-contained respirator projecting forward by swinging the first part and the second part integrally around the connecting part with the helmet while keeping the lower edge of the face shield drawn forward. By avoiding interference with the front end of the face shield, the face shield can be swung lower than before.
In a preferred aspect of the present invention, the pivot shaft of the second portion is arranged on the second portion side.
If the swing axis of the second portion is on the first portion side, the connecting fitting between the first portion and the second portion moves toward the helmet when the second portion swings with respect to the first portion. may interfere with By arranging the swing shaft of the second part on the side of the second part, when the second part is swung with respect to the first part, the connecting fitting between the first part and the second part interferes with the helmet. It is possible to prevent the occurrence of a situation.
In a preferred embodiment of the invention, a spring that resists rocking movement of the second portion connects the second portion and the first portion.
Unintended swinging of the second portion can be restricted by connecting the second portion and the first portion with the spring that resists swinging of the second portion. In addition, since the spring pulls the second portion rearward, the forward overhang of the second portion is suppressed to a minimum, and when the helmet is a fire cap, the front end is engaged with the front end of the second portion ( The forward overhang of the protective cloth surrounding the neck) is minimized to minimize the reduction in the downward field of vision. In addition, since unnecessary swinging of the second portion is suppressed by the biasing force of the spring, the field of vision is stabilized. Furthermore, when the face shield is returned into the helmet, the second portion receiving the biasing force of the spring swings and integrates with the first portion, and the lower edge of the face shield pulled forward moves backward. Therefore, the face shield can be stored in the helmet without any trouble.
In a preferred embodiment of the invention, the spring that resists rocking movement of the second portion is a coil spring.
In a preferred embodiment of the invention, the spring that resists swinging of the second portion is a leaf spring or a linear spring.
The spring that resists swinging of the second portion may be a coil spring, or a leaf spring or a linear spring. Coil springs have the advantage of being easy to obtain, but the width of the helmet is increased in order to provide a space to accommodate the thick coil spring, and when the face shield is opened and closed, the coil spring rubs against the helmet and generates an abnormal noise. There is also the drawback of letting On the other hand, the leaf spring or linear spring has the advantage that it can be made thin, so that it does not increase the width of the helmet and does not generate abnormal noise.
In a preferred aspect of the present invention, the face shield has a stopper for restricting the swinging angle of the second portion with respect to the first portion to a predetermined value.
By providing the stopper, the swing angle of the second portion with respect to the first portion is regulated to an appropriate predetermined value.
In a preferred embodiment of the present invention, the front portion of the face shield is formed of a plurality of vertically connected spherical surfaces that are convex forward.
The front part of the face shield formed with a spherical surface has the advantage of a wide field of view. In addition, by forming the front part of the face shield with multiple spherical surfaces that are convex forward and connected vertically, the lower end of the front part of the face shield moves forward compared to the case where the front part of the face shield is formed with a single spherical surface. The front end of the self-contained breathing apparatus protruding forward can more effectively avoid interference with the face shield.

FIG. 10 is an external perspective view of a conventional face shield which is swingably attached to a helmet and has a generally fan-shaped side view, and in which a connecting portion with the helmet is arranged at a key position of the fan. Arrows I, II, III, IV indicate anterior, posterior, superior, inferior. The same applies to FIGS. 2-9. 1 is a side view of the head of a firefighter wearing a self-contained breathing apparatus face piece on his face and wearing a helmet with a prior art face shield; FIG. Only the lower edge of the front part of the face shield is exposed outside the helmet, and the remaining part is stored inside the helmet. Figure 3 is a side view of the firefighter's head when the conventional face shield is swung downward from the position shown in Figure 2; 1 is a side view of a face shield according to an embodiment of the invention; FIG. The state before the second portion swings with respect to the first portion is shown. FIG. 4B is a side view of the face shield according to the embodiment of the present invention in which the second portion is swung with respect to the first portion; The dashed line indicates the state of the second portion shown in FIG. 4 before rocking with respect to the first portion. 1 is a side view of the head of a firefighter wearing a self-contained breathing apparatus face piece on his face and wearing a helmet with a face shield according to an embodiment of the present invention; FIG. Only the lower edge of the front part of the face shield is exposed outside the helmet, and the remaining part is stored inside the helmet. A firefighter when the face shield according to the embodiment of the present invention is swung downward around the joint with the helmet from the position shown in FIG. 6 with the second part swung with respect to the first part. is a side view of the head of the. FIG. 4 is a side view of a face shield according to another embodiment of the invention; The state before the second portion swings with respect to the first portion is shown. (a) is an overall side view, and (b) is a cross-sectional view taken along the line bb of (a). FIG. 11 is a side view of a state in which the second portion of the face shield according to another embodiment of the present invention is swung with respect to the first portion;

A face shield according to an embodiment of the present invention will be described.
As shown in FIG. 4 and inferred from FIG. 1, the face shield 10, which is formed of a transparent resin thin plate material and has a substantially sectoral shape when viewed from the side, includes a front portion 10a formed of a plurality of forwardly convex spherical surfaces, and a front surface portion 10a. A pair of extension portions 10b extending rearward from a pair of side edges of the portion 10a, and a pair of connection portions 10c with the helmet disposed at a key position of the fan, which is the rear end portion of the pair of extension portions 10b. I have it. The lower edge and the side edges of the front surface portion 10a form a flange 10d protruding in the out-of-plane direction. The face shield 10 is attached inside the helmet so as to be swingable around the pair of connecting portions 10c.
Hereinafter, the structure of the face shield 10 will be described by focusing on one of the paired combinations of the extension portion 10b and the connecting portion 10c. Focusing on the other combination also results in the same structure.
The face shield 10 has a first portion 10e including a portion of the extension portion 10b and the connecting portion 10c, and a second portion 10f including the front portion 10a, the remaining portion of the extension portion 10b, and the collar 10d. is divided in the vicinity of the connecting portion 10c with a boundary line.
An upper edge portion of a portion of the second portion 10f adjacent to the first portion 10e is connected to the first portion 10e via two connecting fittings 10g and 10h so as to be capable of swinging relative to the first portion 10e. there is The pivot shaft 10i of the second portion 10f is arranged on the second portion 10f side. The swing shaft 10i is positioned above the intersection of the dividing line 10j between the first portion 10e and the second portion 10f and the upper edge of the face shield 10. As shown in FIG.
A lower edge of a portion of the second portion 10f adjacent to the first portion 10e is connected to a lower edge of a portion of the first portion 10e adjacent to the second portion 10f via a coil spring 10k.

The operation of the face shield 10 will be explained.
As shown in FIG. 6, when the face shield 10 is stored in the helmet 4 except for the brim 10d formed by the lower edge of the front surface portion 10a, the first portion 10e and the second portion 10e are biased by the coil spring 10k. The part 10f shares the parting line 10j, contacts each other, and is integrated.
From the state shown in FIG. 6, the helmet user grabs the portion forming the lower edge of the front portion 10a of the collar 10d with fingers and pulls it downward, swinging the face shield 10 around the connecting portion 10c and pulling it downward.
The face shield 10 swings downward around the connecting portion 10c while maintaining the integrated state of the first portion 10e and the second portion 10f. The collar 10d forming the lower edge of the front face portion 10a contacts the front end portion 3a of the face piece 3 of the self-contained breathing apparatus, and the downward swinging of the face shield 10 stops, resulting in a state similar to that shown in FIG. The entire side surface of the face shield 10 at this time is indicated by broken lines in FIG.
A helmet user pulls the brim 10d obliquely downward. A pair of upper edges of the second portion 10f adjacent to the first portion 10e are connected to the first portion 10e so as to be able to swing about the swing shaft 10i, so that the collar 10d is pulled obliquely downward. , the second portion 10f swings, and the flange 10d forming the lower edge of the front face portion 10a is drawn obliquely downward along the shape of the facepiece 3. As shown in FIG. As a result, the front end of the collar 10d moves forward and downward as indicated by the solid line in FIG.
A trajectory L1 of the front end of the collar 10d when the face shield 10 in which the first portion 10e and the second portion 10f are integrated as shown by a dashed line in FIG. FIG. 5 shows a trajectory L2 of the front end of the collar 10d when the face shield 10, in which the second portion 10f is rocked about the rocking axis 10i with respect to the first portion 10e, is rocked about the connecting portion 10c. Indicated by a dash-dotted line. As can be seen from FIG. 5, the trajectory L2 is located forward of the trajectory L1.
The helmet user pulls the brim 10d forward and downward. The face shield 10 swings around the connecting portion 10c while maintaining the state in which the front end of the collar 10d is pulled forward, and swings downward over the front end portion 3a of the facepiece 3 of the self-contained breathing apparatus. As shown in 7, it abuts against the intake pipe 2 and stops. The entire side surface of the face shield 10 at this time is indicated by a solid line in FIG.
7 and 3, the face shield 10 has a wider swing range than the face shield 1 and can swing downward more than the face shield 1, so that it has a wider field of view than the face shield 1. can get.
Unintended swinging of the second portion 10f can be restricted by connecting the second portion 10f and the first portion 10e with the spring 10k that resists swinging of the second portion 10f. Further, since the spring 10k pulls the second portion 10f rearward, the forward overhang of the second portion 10f is suppressed to a minimum. The forward overhang of the roller (protective cloth surrounding the neck) whose front end is locked to 10d is minimized, and the reduction in the downward field of view is minimized. In addition, since unnecessary swinging of the second portion 10f is suppressed by the biasing force of the spring 10k, the field of vision is stabilized. Further, when the face shield 1 is returned into the helmet 4, the second portion 10f receiving the biasing force of the spring 10k swings and integrates with the first portion 10e, and the lower edge of the face shield 1 pulled forward moves rearward, the face shield 1 can be stored in the helmet 4 without any trouble.

Since the swing shaft 10i of the second portion 10f is arranged on the side of the second portion 10f, there is no danger that the connecting fitting 10h will interfere with the helmet 4 when the second portion 10f is swung with respect to the first portion 10e. . The swing axis of the second portion 10f may be arranged on the side of the first portion 10e, for example, at 10i' in FIG. In addition, there is a possibility that the connecting fitting 10h may move toward the helmet 4 and interfere with the helmet 4.
Since the swing axis 10i is arranged above the intersection of the dividing line 10j between the first portion 10e and the second portion 10f and the upper edge of the face shield 10, the second portion 10f is positioned relative to the first portion 10e. When swinging, the corner of the second portion 10f forming the intersection does not interfere with the edge of the first portion 10e forming the dividing line 10j. As a result, the second portion 10f can swing without any trouble.
The corners of the second portion 10f may be cut linearly or in a convex arc shape. Alternatively, the corners of the first portion 10e facing the corners may be cut linearly or in a concave circular arc shape. Mutual interference between the second portion 10f and the first portion 10e is prevented when the second portion 10f is swung with respect to the first portion 10e, and trouble-free swinging of the second portion 10f is ensured.
The swing shaft 10i may be arranged below the intersection of the dividing line 10j between the first portion 10e and the second portion 10f and the upper edge of the face shield 10. It is necessary to cut the corners of the two parts 10f in a straight line or a convex circular arc to prevent mutual interference between the two when the second part 10f is swung with respect to the first part 10e.

In the above-described embodiment, the coil spring 10k was used as the spring that resists the swinging motion of the second portion 10f with respect to the first portion 10e. A 10m spring may be used.
A narrow leaf spring or linear spring 10m has a bent end 10m1 inserted into a through hole 10e1 formed in the _first portion 10e, and a portion near the _one end 10m1 formed in the _first portion 10e. One end is fixed to the _first portion 10e while being inserted into the groove 10e2. The other end 10m2 of the plate spring or linear spring 10m is bent, and the vicinity of the other end _10m2 is engaged with a stopper 10n formed on the _second portion 10f. As can be seen from FIG. 8, in the state before the second portion 10f swings with respect to the first portion 10e, the leaf spring or linear spring 10m is bent to direct the second portion 10f toward the first portion 10e. It is oscillating. As a result, the first portion 10e and the second portion 10f are integrated. A cover member (not shown) prevents the plate spring or linear spring 10m from coming off toward the front in FIGS.
When the second portion 10f is swung with respect to the first portion 10e about the swing shaft 10i to reach the state shown in FIG. The biasing force that biases toward the first portion 10e increases. The bent other end 10m2 of the plate spring or linear spring 10m is engaged with the stopper 10n to restrict the swinging of the _second portion 10f.
The coil spring 10k shown in FIGS. 4 and 5 has the advantage of being easily available, but the width dimension of the helmet 4 is increased in order to provide a space for accommodating the thick coil spring 10k, and when the face shield 10 is opened and closed, the coil spring There is also a drawback that 10k rubs against the helmet 4, causing the spring to vibrate and generate abnormal noise. On the other hand, since the leaf spring or linear spring 10m can be made thin, there is an advantage that the width of the helmet 4 is not increased and no abnormal noise is generated when the face shield 10 is opened and closed.
By providing the stopper 10n, the swinging angle of the second portion 10f with respect to the first portion 10e is regulated to an appropriate predetermined value. Also in the first embodiment, it is of course possible to provide a stopper for restricting the swinging angle of the second portion 10f with respect to the first portion 10e to an appropriate predetermined value.
The front surface portion 10a of the face yield 10 is formed of _three spherical surfaces that are vertically connected to _each other, namely, a central portion 10a1, which is the largest area, and an upper portion 10a2 and a lower portion _10a3 .
The front part 10a of the face shield formed with a spherical surface has the advantage of having a wide field of view. In addition, by forming the front surface portion 10a of the face shield with a plurality of spherical surfaces that are convex forward and connected vertically, the lower end of the front surface portion 10a of the face shield is lower than in the case where the front surface portion 10a of the face shield is formed with a single spherical surface. can be protruded forward, and interference between the forward protruding front end of the face piece of the self-contained breathing apparatus and the front part 10a of the face shield can be more effectively avoided.

The present invention is useful not only in the use of face shield helmets with self-contained breathing apparatus facepieces, but also in the use of face shield helmets with dust or gas respirator facepieces having long front ends. is also applicable.

1, 10 Face shield 1a, 10a Front part 1b, 10b Extension part 1c, 10c Connection part 1d, 10d with helmet Collar 10a ₁ Central part 10a ₂ Upper part 10a ₃ Lower part 10e First part 10e ₁ Through hole 10e ₂ Straight groove 10f Second parts 10g, 10h Connecting fitting 10i Swing shaft 10j Parting line 10k Coil spring 10m Leaf spring or linear spring 10m ₁ One end 10m ₂ Other end 10n Stopper

Claims (7)

A face shield that is swingably attached to a helmet and has a substantially fan shape in a side view, the face shield having a connecting portion with the helmet disposed at a pivotal position of the fan, wherein a pair of first portions including the connecting portion and A face shield characterized by being divided into a second portion near the connecting portion, and an upper portion of the second portion adjacent to the first portion is swingably connected to the first portion. 2. The face shield according to claim 1, wherein the swing shaft of the second portion is arranged on the second portion side. 3. A face shield according to claim 1 or 2, wherein a spring that resists rocking of the second portion connects the second portion and the first portion. 4. The face shield of claim 3, wherein the spring that resists rocking of the second portion is a coil spring. 4. The face shield as claimed in claim 3, wherein the spring resisting swinging of the second portion is a leaf spring or a linear spring. 6. The face shield according to any one of claims 1 to 5, further comprising a stopper that regulates the swinging angle of the second portion with respect to the first portion to a predetermined value. 7. The face shield according to any one of claims 1 to 6, wherein the front part of the face shield is formed of a plurality of spherical surfaces that are vertically connected and convex forward.

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