SAFETY HELMET

Abstract: This invention provides a safety helmet (A) provided with a ventilation arrangement wherein a duct (B) defining an air intake opening (9) is mounted on a window edge (6) of the forehead of a helmet body (1), and within the helmet body (1) a guide groove (16) in communication with a blowing opening of the duct (B) is formed by cutting a side cushion (4) mounted internally of a shock absorbing liner and an air outflow groove (17), is defined by cutting a part of the side cushion positioned on the side of the back of the head.

Description: BACKGROUND OF THE INVENTION Field of the Invention This invention relates to a helmet, and more specifically to a crash helmet to be worn when riding on or in a motor vehicle such as a motor cycle or an automobile. Prior Art Generally, the helmets comprise a protective shell and are either of a full-face type, which cover the head except for a cut out in the front for vision and such as to leave an integral chin guard, or the jet type which cover the heat but the lower edge is profiled to leave a face opening for vision. Usually a transparent shield is applied of the front surface of the helmet to cover the cut out or opening to prevent blowing of air against the edges, but by applying such a shield it sometimes happens that insufficient air flows into the helmet so that the users head becomes hot and stuffy, and the users forehead perspires which can feel unpleasant. In order to overcome such an inconvenience as noted above, it has been proposed to form a hole or holes in the shell for introducing air into communication with the interior of the helmet body such hole or holes being formed at the forehead of and in the vicinity of the edge of the cut out or opening where air strikes the front of the helmet body. However, the provision of the hole in such a place deteriorates the strength of the helmet shell itself, possibly reducing the safety of the helmet. Furthermore, there has been proposed a full-face type helmet in which in consideration of the strength, an intake construction is provided on the same guard portion below the cut out in the front surface, said intake construction serving to guide and blow the introduced air toward the upper part within the helmet. However, in the aforementioned intake constructions, the air is blown through a cushion material provided internally of the helmet, and the air flow is impaired by the cushion material, and good ventilation is not obtained. SUMMARY OF THE INVENTION It is an object of the present invention to provide a helmet provided with a ventilation arrangement which is simple in construction and serves to allow the introduction of air therein without reducing the strength of the front part of the helmet which is the most important part for absorbing collision shocks. It is an object of the preferred form of the invention to provide a helmet which provides ventilation of the users head by means of a flow of air which is not impaired by the presence of helmet cushion material. The above objects and features of the present invention will be more completely understood from reading the ensuing detailed description of two embodiments of the invention illustrated in the accompanying drawings. The drawings are merely provided for interpretation and not intended to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS The drawings show the embodiments of the present invention. In the drawings:- FIG. 1 is a longitudinal sectional side view of a full-face helmet according to one embodiment of the invention; FIG. 2 is a front view partly in section; FIG. 3 is a sectional view taken on line 3-3 of FIG. 1; FIG. 4 is an enlarged sectional view of an air intake portion; FIG. 5 is a perspective view of a duct mounted on the helmet body; and FIG. 6 is a perspective view showing a jet type helmet according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention being a full-face type helmet is shown in Figs. 1 to 5 of the drawings. Reference character A designates a helmet body, and B designates a duct.& <PAR>The helmet body A is composed of a cap body or helmet shell 1 molded from a material such as fibre reinforced plastic (FRP), a shock absorbing liner 2, which is formed of polystyrene foam or a material having a shock absorbing performance which is equal to or more than that of the polystyrene, fitted internally of the cap body 1, a jaw guard 3 formed of polystyrene foam or the like extending from the jaws to the left and right temple portions within the cap body 1, a side cushion 4 mounted on the inner surface of the shock absorbing liner 2, a head cushion 5, and a chin strap not shown. In the cap body 1 of the helmet body A is formed a cut out or window hole 6 of generally rectangular shape so that the user can see when wearing the helmet, the window hole 6 being opened and closed by a transparent shield 7 rotatably mounted externally on the cap body 1. The side cushion 4 provided internally of the shock absorbing liner 2 is made in such a manner that a cushion material 4a having a good permeability, for example, a coarse net-like polyurethane foam, is wrapped by an inside cloth 4b which is agreeable to the touch and has a good permeability. A flat duct B is held in position by adhesive and keep band 14 on both left and right sides of an upper edge of a window hole 6 in the helmet body A. The inside cloth 4b in direct touch with the head body is formed of a special water absorbing cloth which carries all the sweat to the rear of the cloth so that it will always feel fresh. The duct B is formed of a soft plastic or a rubber so that if the helmet should receive a shock such that the users head impacts the duct, the duct B deforms so as to minimise damage to the head. The duct B (FIG. 5) is formed of the aforementioned material into a flat rectangular shape whose front and upper surfaces are open, the depth thereof having a dimension which is the length from the front end edge of the window hole 6 to the side cushion 4. The duct B includes therein two flat plate-like upright partition and ribs 8a from the front end toward the rear end, an air intake 9 is defined at the front end by a lateral web 8b for connecting the partition and ribs 8a each other, and the rear portion of the lower surface is curved circularly toward the upper end so that the inflow air may flow toward the upper surface of the rear portion, namely, the inner surface of the shock absorbing liner 2. In mounting the duct B, the duct B is inserted adjacent a keep band 14 secured to the lower surface of the upper edge of the window hole 6, with the upper opening thereof joined to the lower surface of the front end of the liner 2, and the lateral web 8b on the front side of the upper surface is bonded by the adhesive to a rubber edge fitting 15 secured to the edge of the window hole of the cap body 1 whereby the duct B is fixed in position. Thereby, the upper surface of the duct B from the front to the rear is closed by the shock absorbing liner 2, and only the upper surface of the rear portion projecting inwardly of the liner 2 is open to allow air flow. To this end, duct B registers with the guide groove 18 formed by cutting the side cushion 4. Accordingly, air entering from the air intake 9 of the duct B flows from the opening of the upper surface of the rear portion into the guide groove 16 formed by cutting the side cushion 4, and the air flows to the top of the helmet body A to cool the head. The air blown into the helmet passes through an air outflow groove 17 formed by longitudinally cutting a rear part of the side cushion mounted within the helmet body A and is discharged to outside the helmet from the lower side at the rear portion of the helmet. The air flow within the helmet is assisted by the negative pressure which occurs at the rear of the neck when the motor cyclist is in motion, and the air flows out of the helmet downwardly from the helmet body A. The shield 7 for opening and closing the window hole 6 of the hel body A is provided with a hole 11 in communication with the air inlet 9 of the duct B. It is noted that the hole 11 in the shield 7 may be of the same shape as that of the air intake 9 but it will be of course noted that the flow rate may be adjustable by the provision of a means for opening and closing the hole 11 to a greater or lesser extent by the means shown. The means for opening and closing the hole 11 is constructed such that a plastic mounting frame 12 and a slide plate 13 are mounted on the side of the shield 7 so that the slide plate 13 is moved upward and downward to thereby adjust the degree of opening of the hole 11 to adjust the quantity of air flowing into the duct B. In the winter season or the like when no ventilation is required, the slide 13 is operated to close the hole 11, and the guide groove 16 within the helmet body A is filled up by fitting in position an auxiliary side cushion 18 formed in the same shape as that of said guide groove. It is to be noted that the positioning of the duct B is not to be limited to both left and/or right side of the open hole edge of the forehead but it can be located in any suitably selected place such as the centre or other places. While in the foregoing, the helmet of the full-face type has been described, it is noted that in the case of the jet type helmet, a duct is mounted on the lower edge of the forehead portion as shown in FIG. 6 so as not to impair the view required for travelling. It is also noted that the mounting of the duct B and the formation of the guide groove and air outflow groove within the helmet is similar to that of the full-face type. According to the preferred form of helmet of the present invention, as described above, an air intake is defined at an open hole edge of a forehead in a helmet body, a duct having a length extending to the inside of a shock absorbing liner is provided, a guide groove in communication with a blowing opening of the duct is formed within the helmet body by cutting a side cushion provided internally of a shock absorbing liner, and an air outflow groove is formed by cutting a part of a side cushion positioned on the side of the back of the head. Therefore, the air discharged from the air intake of the duct flows toward the top of the head through the guide groove and is blown into the helmet to effectively cool the head. Moreover, the duct is mounted simply without requiring any operation such as making a hole in the helmet itself or the like, and therefore there is no danger that the strength of the helmet shell will be deteriorated. Furthermore, since the duct is formed of a pliable material, there is no danger resulting from impact therewith, and in addition, the mounting position of the duct is at the top edge of the cut out or opening, and therefore, there is no danger of the duct impairing the view of the user.

Claims: 1. A safety helmet for a vehicle rider comprising a helmet shell (1), shock absorbing lining means (2) inside the shell (1), a viewing opening in the front of the helmet and defined by an edge (6) of said shell (1), an air intake duct (B) facing forwardly of the helmet and opening into the interior of the helmet so that by virtue of forward motion of the user air will flow into the duct (B) and then into the interior of the helmet to cool the user's head, characterised in that said duct (B) is located in said opening defined by said edge (6) as opposed to being formed in the shell (1) which could structurally weaken same. 2. A helmet according to Claim 1, wherein said shock absorbing lining means (1) comprises a shock absorbing liner on the carrier surface of said shell (1) and there is a cushion on the inside of said shock absorbing lining (2) characterised in that the cushion (4, 5) has a front groove (16) therein adjacent a portion of said edge (6) which lies adjacent the user's forehead, and a rear groove (17) therein ad jacent the back of the user's neck, said duct (B) is positioned adjacent the said portion of said edge (6) and extends across the thickness of the shock absorbing lining means so that air issuing from the duct passes into said front groove (16), into the helmet interior and then exhausts through said rear groove (17). 3. A helmet according to Claim 2, characterised in that there are two of said ducts (B) symmetrically arranged in relation to vertical central plane of the helmet, and there are two of said front grooves (17). 4. A helmet according to Claims 1, 2 or 3, wherein the helmet has a transparent visor or guard (7) which is positionable to cover the opening, characterised in that the visor (7) has an opening (11) or openings (11) which register with the intake duct (B) or intake ducts (B) when the visor (7) closes the opening. 5. A helmet according to Claim 4, characterised in that the or each opening (11) in the visor (7) can be opened or closed to a greater or lesser degree by an adjustable plate (13) which is adjustably mounted on said visor (7).

Inventors: ARAI, MICHIO
Applicants: ARAI HELMET LIMITED
Application year: 1987
Main classification: A42B3
IPC codes: A42B3