Abstract:
This invention is to obtain a targeted traveling-window channeling-off function irrelevant to respective intrinsic driving postures of a helmet wearer, a speed of vehicles and the like. Helmets A, B, C include straightening members which relate to the holding of the stability of the helmets during traveling. The straightening members are provided in a state that a position of the straightening members is adjustable in a fore-and-aft direction or an angle of straightening surfaces which face a traveling window in an opposed manner is adjustable corresponding to various intrinsic driving postures of a helmet wearer and a speed of vehicles.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a helmet which a driver wears when he rides on various kinds of vessels and vehicles such as a motorcycle, and a automobile, a motorboat or a bicycle, and more particularly to a helmet which has a ventilation structure in the helmet and a straightening structure for channeling off a traveling wind from a surface of the helmet. 
   2. Description of the Related Art 
   As related art literature information relevant to the present invention, we note Japanese Patent Laid-Open No. 2000-328343 [Patent Document 1] and WO2002-100204 [Patent Document 2]. 
   The constitution described in the above-mentioned Patent Document 1 is characterized in that a portion which performs the channeling-off of a traveling wind (a rear straightening member) and a portion which performs the ventilation (a passage forming member) are mounted on a surface of a helmet body as an integral structure. 
   Further, the constitution described in the above-mentioned Patent Document 2 is also characterized in that a portion which performs the channeling-off of a traveling wind (an air flow deflection surface) and a portion which performs the ventilation (a ventilation port) are mounted on a surface of a helmet body as an integral structure. 
   That is, the inventions disclosed in the above-mentioned Patent Document 1 and Patent Document 2 are useful from a viewpoint of enhancing a ventilation action and a straightening action by channeling-off the above-mentioned traveling wind. 
   Here, with respect to the inventions described in the above-mentioned Patent Document 1 and Patent Document 2, the portion which performs the channeling-off of the traveling wind and the portion which performs the ventilation are integrally formed and, at the same time, these portions are mounted on fixed positions on the surface of the helmet body in an immobile state. Accordingly, there may be a case that a targeted channeling function cannot be sufficiently obtained depending on the difference in intrinsic driving postures of helmet wearers, speeds of vehicles and the like. 
   Accordingly, it is a task of the present invention to obtain a targeted traveling-wind channel-off function irrespective of the difference in intrinsic driving postures of helmet wearers, speeds of vehicles. 
   SUMMARY OF THE INVENTION 
   To achieve the above-mentioned object, the present invention adopts following technical means. 
   The technical means is directed to a helmet which mounts a straightening member relating to holding of stability of the helmet against flow of air during traveling on a surface of a helmet body, wherein the straightening member is formed so as to allow a helmet wearer to adjust a position of the straightening member in a fore-and-aft direction corresponding to various intrinsic driving postures of the helmet wearer and a speed of vehicles (first invention). 
   Further, another technical means is directed to a helmet which mounts a straightening member relating to holding of stability of the helmet against flow of air during traveling on a surface of a helmet body, wherein the straightening member is formed so as to allow a helmet wearer to adjust an angle of a straightening surface which faces a traveling wind corresponding to various intrinsic driving postures of the helmet wearer and a speed of vehicles (second invention). 
   Further, still another technical means is directed to a helmet which mounts a straightening member relating to holding of stability of the helmet against flow of air during traveling on a surface of a helmet body, wherein the straightening member is formed so as to allow a helmet wearer to adjust a position of the straightening member in a fore-and-aft direction and, at the same time, to adjust an angle of a straightening surface which faces a traveling wind corresponding to various intrinsic driving postures of the helmet wearer and a speed of vehicles (third invention). 
   Further, when the helmet includes an air ventilation port on the surface of the helmet body, from a viewpoint of enhancing the discharge efficiency from a discharge port, it is preferable that the straightening body is capable of adjusting a relative position thereof within a range that the straightening member is capable of straightening the flow of air in the vicinity of the ventilation port (fourth invention). 
   When the helmet includes a ventilation cover which covers the ventilation port, from a viewpoint of the enhancement of the discharge efficiency from the ventilation cover, the enhancement of the manipulation performance and the assurance of favorable design, it is preferable that the straightening member forms an integral structure with the ventilation cover (fifth invention). 
   As the structure which changes the position of the straightening member, it is possible, for example, the structure which is a combination of an elongated hole which is formed along the fore-and-aft direction in one side of the straightening member or a support portion which supports the straightening member and a fitting member which is formed on another side and is fitted in the elongated hole and in which the fitting member holds the position of the straightening member and releases such holding, and the structure which forms ratchets on the straightening member and a support surface which supports the straightening member and in which the position of the straightening member is changed by moving the straightening member in the fore-and-aft direction against the fitting resistance of the ratchet. 
   Further, as the structure which changes the angle of the straightening member, it is possible, for example, the structure which includes an adjustment means which rotatably supports the front side of the straightening member so as to move the rear end of the straightening member vertically and holds the straightening member at predetermined position, and the structure which pivotally supports the front side of the straightening member and forms ratchets over the straightening member and a support surface which support the straightening member behind the pivotally supporting portion and moves the straightening member vertically against the fitting resistance of the ratchets so as to change the position of the straightening member. 
   The present invention can expect following excellent effects due to the above-mentioned constitutions. 
   According to the first invention, by allowing the helmet wearer to change the position of the straightening member to a position which corresponds to the various intrinsic driving postures of the helmet wearer and the speed of vehicles, it is helps to obtain the targeted traveling-wind channel-off function. 
   Further, according to the second invention, by allowing the helmet wearer to change the angle of the straightening member to an angle which corresponds to the various intrinsic driving postures of the helmet wearer and the speed of vehicles, it is possible to obtain the targeted traveling-wind channel-off function. 
   Further, according to the third invention an adjustment corresponding to various intrinsic driving postures of the helmet wearer and vehicle speed is enabled and hence helps to enhance the targeted traveling-wind channel-off function. 
   Further, according to the fourth invention, in addition to the acquisition of the effects of the above-mentioned first and second inventions, the straightening is conducted in the vicinity of the ventilation port for ventilation and hence, it helps to efficiently perform the discharge from the discharge port. Due to this efficient discharge, it helps to allow the traveling wind to efficiently enter the inside of the helmet through an intake port and hence, it helps to expect the efficient ventilation in the helmet. 
   Further, according to the fifth invention, it helps to expect the discharge efficiency from the ventilation cover, the enhancement of the manipulation performance and the favorable design. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of a helmet according to the present invention; 
       FIG. 2  is a cross-sectional view taken along a line (II)-(II) in  FIG. 1 ; 
       FIG. 3  is an enlarged view with a part broken away of an essential part showing another embodiment; 
       FIG. 4  is a perspective view taken along a line (IV)-(IV) in  FIG. 3 ; 
       FIG. 5  is an enlarged view of an essential part showing another example; 
       FIG. 6  is a cross-sectional view taken along a line (VI)-(VI) in  FIG. 5 ; 
       FIG. 7  is an enlarged view of an essential part showing another example; 
       FIG. 8  is a cross-sectional view taken along a line (VIII)-(VIII) in  FIG. 7 ; 
       FIG. 9  is a cross-sectional view taken along a line (IX)-(IX) in  FIG. 7 ; 
       FIG. 10  is a cross-sectional view of an essential part showing another example; 
       FIG. 11  is a cross-sectional view taken along a line (XI)-(XI) in  FIG. 10 ; 
       FIG. 12  is a perspective view of an essential part showing another example; 
       FIG. 13  is a perspective view of an essential part showing another example; and 
       FIG. 14  is a perspective view of an essential part showing another example. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Best modes for carrying out a helmet of the present invention are explained hereinafter in conjunction with drawings. 
     FIG. 1  to  FIG. 4  show the first embodiment (helmet A) of the present invention,  FIG. 5  to  FIG. 11  show the second embodiment (helmet B) of the present invention, and  FIG. 12  and  FIG. 13  show the third embodiment (helmet C) of the present invention. 
   The basic construction of the helmets A to C illustrated in the respective modes is configured as follows. That is, in the inside of a helmet body  1  which is formed in a given shape using a fiber reinforced resin material, an impact absorbing liner which is formed of foamed styrene or a material having an impact absorbing function equivalent to an impact absorbing function of the foamed styrene, a head interior member which is arranged inside the impact absorbing liner and is made of a urethane material or the like, and cheek pads are interiorly formed. A shield  2  is mounted on a front opening portion of the helmet body  1  in a state that the shield  2  can be opened and closed. The helmet body is provided with two ventilation ports, that is, left and right ventilation ports  2 L,  2 R which discharge hot air from inside the helmets A to C. 
   Here, although the helmet illustrated in this mode for carrying out the invention is a full-face type helmet, the present invention is not limited to the full-face type helmet and is also applicable to a jet type helmet and a half type helmet. 
   First of all, the first mode of the present invention is explained. 
   The helmet A of this mode is characterized in that ventilation covers  3 L,  3 R which cover and conceal the above-mentioned ventilation ports  2 L,  2 R are mounted on a surface of the helmet body  1 , and a position of a straightening member  4  can be changed due to the slide structure which allows the straightening member  4  to slide in the fore-and-aft direction along the ventilation covers  3 L,  3 R. 
   The ventilation covers  3 L,  3 R of this mode are approximately tunnel-like covers which are formed to guide a traveling wind from a front side to a rear side of the helmet body  1 . Each of the respective ventilation covers  3 L,  3 R forms an intake port  31  in a front end thereof and an discharge port  32  in a rear end thereof. By making use of a negative pressure which is generated when the traveling wind enters the helmet A from the intake port  31  and is discharged from the discharge port  32 , hot air in the inside of the helmet A is sucked from the ventilation ports  2 L,  2 R which are positioned inside the ventilation covers  3 L,  3 R. 
   Hereinafter, the slide structure of the above-mentioned straightening member  4  in the helmet A of this mode is explained (see  FIG. 1 ,  FIG. 2 ). 
   The above-mentioned straightening member  4  is configured such that the straightening member  4  includes an elongated hole  42  for slide guiding on a front side and a straightening surface  41  on a rear side and, further, includes slide surfaces  43 L,  43 R which slide while being guided by the ventilation covers  3 L,  3 R. The straightening member  4  is mounted on the helmet body  1  by allowing a small screw  12  which fixes the position of the straightening member  4  or releases such fixing to be threadedly engaged with a screw hole  11  formed in the surface of the helmet body  1  between the above-mentioned ventilation covers  3 L,  3 R through the elongated hole  42 . 
   That is, according to the slide structure having the above-mentioned constitution, the straightening member  4  is allowed to be slidable in the fore-and-aft direction along the ventilation covers  3 L,  3 R by loosening or slackening the above-mentioned small bolt  12  and is held at the position by fastening the small bolt  12 . 
   Here, the slide distance of the above-mentioned straightening member is ensured by an amount corresponding to a length of the elongated hole. The change of the slide distance can be realized by preparing the straightening members having elongated holes of different lengths and by exchanging one straightening member with another straightening member which has the targeted elongated hole (not shown in the drawing). 
   Hereinafter, another slide structure of the straightening member  4  which slides in the fore-and-aft direction is explained (see  FIG. 3  and  FIG. 4 ). 
   The slide structure of this mode is characterized in that the sliding and the fixing of the straightening member  4  are controlled by ratchets. The explanation of parts which overlap the above-mentioned parts is omitted by giving the same symbols to the parts. 
   The straightening member  4  is mounted on the helmet body  1  in a state that the straightening member  4  is mounted on a fixed plate  44  which is fixedly secured to the surface of the helmet body  1  between the above-mentioned ventilation covers  3 L,  3 R by way of a ratchet  5  and a slide guide portion  6  which are formed over the fixed plate  44  and the straightening member  4 . 
   The ratchet  5  is configured such that fitting recessed portions  51 L,  51 R in two rows which form a large number of indentations  51  therein in the fore-and-aft direction of the above-mentioned ventilation covers  3 L,  3 R are mounted on the fixed plate  44  and, at the same time, resilient fitting members  52 L,  52 R which are engaged with or disengaged from the indentations  51  formed in either one of the above-mentioned fitting recessed portions  51 L,  51 R are mounted on the above-mentioned straightening member  4 . 
   The slide guide portion  6  is configured such that latch projections  53 L,  53 R are mounted on the above-mentioned fixed plate  44  along the fitting recessed portions  51  L,  5   1 R in a state that the latch projections  53 L,  53 R are arranged outside the above-mentioned fitting recessed portions  51 L,  51 R, while slide projections  54 L,  54 R which are slidably engaged with the above-mentioned latch projections  53 L,  53 R are mounted on the straightening member  4 . 
   That is, according to the slide structure having the above-mentioned constitution, the position of the straightening member  4  is held by the engagement of the resilient fitting members  52 L,  52 R with the fitting recessed portions  51 L,  51 R formed in the ratchet  5 , while the engagement of the resilient fitting members  52 L,  52 R with the fitting recessed portions  51 L,  51 R is released by slidably moving the straightening member  4  with a force larger than a resilient force of the ratchet  5  and the straightening member  4  is slidably moved in the fore-and-aft direction due to the slide movement of the slide projections  54 L,  54 R along the latch projections  53 L,  53 R. 
   Here, the slide distance of the above-mentioned straightening member is ensured by an amount corresponding to a length of the above-mentioned fitting recessed portions and latch projections. The change of the slide distance can be realized by preparing the fitting recessed portions and latch projections having different lengths and by exchanging one straightening member with another straightening member which has the targeted fitting recessed portion and latch projection (not shown in the drawing). 
   Further, the mode of arrangement of the constitutional members of the above-mentioned ratchet and the slide guide portion may adopt a mode which is opposite to the illustrated mode. 
   Further, one of constitutional members consisting of the above-mentioned ratchet and slide guide portion may be directly formed on the ventilation cover. 
   The second mode of the present invention is explained hereinafter. 
   The helmet B of this mode includes ventilation covers  3 L,  3 R in the same manner as the above-illustrated helmet A and also includes a straightening member  7  between the ventilation covers  3 L,  3 R. 
   Further, the straightening member  7  of this mode is configured to be capable of changing an angle of a straightening surface  71  against a traveling wind by changing an angle of the straightening member  7  by rotatably supporting the straightening member  7  using the pivotally supporting portion P as an axis. 
   Here, the explanation of parts which overlap the parts of the above-mentioned helmet A is omitted by giving the same symbols. 
   The angle changing structure of the above-mentioned straightening member  4  in the helmet B of this mode is explained hereinafter (see  FIG. 5  and  FIG. 6 ). 
   The straightening member  7  of this mode is rotatably supported on a pivotally supporting plate  45  which is fixedly secured to the surface of the helmet body  1  between the above-mentioned ventilation covers  3 L,  3 R. 
   In the above-mentioned pivotally supporting plate  45 , a space S which has a size to allow the snug fitting of the straightening member  7  is formed. The straightening member  7  is fitted in the space S and front-end-side side surfaces of the straightening member  7  are pivotally supported on front-end-side side surfaces of the space S. 
   Further, the above-mentioned straightening member  7  is supported on a bolt  72  which is mounted between a rear-end-side bottom surface of the straightening member  7  and a bottom surface  451  of the pivotally supporting plate  45 . 
   The above-mentioned bolt  72  has an upper end thereof fitted in an elongated groove  73  formed in the rear-end-side bottom surface of the straightening member  7  in a state that the bolt  72  is slidable in the elongated groove  73  and is prevented from being removed from the elongated groove  73 . The above-mentioned bolt  72  has a lower end thereof threaded into a pedestal portion  74  mounted on the above-mentioned helmet body  1 . 
   The above-mentioned elongated groove  73  is provided for absorbing the displacement of the fitting position of the bolt  72  at the time of changing the angle of the straightening member  7  described later. 
   A dial  75  is fixedly mounted on and is disposed around the above-mentioned bolt  72 . When the dial  75  is rotated, the bolt  72  is rotated and a projecting length of the bolt  72  with respect to the pedestal portion  74  is adjusted to a short length as well as to a long length. 
   That is, according to the angle changing structure of this mode, by elongating the projecting length of the above-mentioned bolt  72  with the rotation of the above-mentioned dial  75 , a rear end portion of the straightening member  7  is lifted upwardly and the position is held. 
   Here, the above-mentioned straightening member  7  is rotated using the above-mentioned pivotally supporting portion P as the center of rotation so that an angle thereof is changed upwardly. 
   Further, by shortening the projecting length of the above-mentioned bolt  72  with the reverse rotation of the above-mentioned dial  75 , the bolt  72  pulls down the rear end portion of the straightening member  7  and the position is held. 
   Here, the above-mentioned straightening member  7  is rotated using the above-mentioned pivotally supporting portion P as the center of rotation so that an angle thereof is changed downwardly. 
   Due to the above-mentioned operations, the angle of the straightening member  7  is changed and hence, it is possible to change the angle of the straightening surface  71  against the traveling wind. 
   Here, an angle variable range of the above-mentioned straightening member is increased or decreased corresponding to the vertical movable distance of the bolt. The change of this angle variable range can be realized by exchanging bolts which have different lengths (not shown in the drawing). 
   Further, the straightening member may be directly pivotally supported on the ventilation cover. 
   Another angle changing structure of the straightening member  7  whose angle is changed is explained hereinafter (see  FIG. 7  to  FIG. 9 ). 
   The angle changing structure of this mode is characterized by gradually changing the angle of the straightening member  7  by a left-and-right rotational manipulation of a lever  76  and the explanation of parts which overlap the above-mentioned parts is omitted by giving the same symbols. 
   On a rear-end-side bottom surface of the above-mentioned straightening member  7 , a recessed plate  78  is formed in a projecting manner, wherein a large number of indentation portions  77  are formed in the left-and-right direction in parallel in a state that heights of the indentation portions  77  are gradually changed in the longitudinal direction. Further, a projecting portion  79  of the above-mentioned lever  76  is configured to be fitted in any selected one of the indentation portions  77  formed on the recessed plate  78 . 
   The above-mentioned indentation portions  77  are formed in an arcuate shape, while the projecting portion  79  is formed in an arcuate shape which conforms to the arcuate shape of the above-mentioned indentation portions  77 . 
   The above-mentioned lever  76  is pivotally supported on a bottom surface  452  of the pivotally supporting plate  45  in a state that the lever  76  is rotatable in the left-and-right direction, wherein with the left-and-right rotating manipulation of the lever  76 , the fitting position of the projecting portion  79  with respect to the above-mentioned indentation portions  77  is changed. 
   Symbols  80 L,  80 R indicate leaf springs which are fixedly secured to the straightening member  7 , while symbols  81 L,  81 R indicate latch portions which are formed on the above-mentioned bottom surface  452  to latch the above-mentioned leaf springs  80 L,  80 R. By applying a biasing force of the leaf springs  80 L,  80 R which are latched to the latch portions  81 L,  81 R to the downward rotation of the straightening member  7 , the fitting state of the projecting portion  79  with respect to the indentation portions  77  is held. 
   That is, according to the angle changing structure of this mode, the fitting position of the projecting portion with respect to the above-mentioned indentation portions  77  is changed with the left-and-right rotary manipulation of the above-mentioned lever  76 , and the rear end portion of the straightening member  7  is moved vertically due to the change of the fitting position and the fitted state is held by the biasing force of the above-mentioned leaf springs  80 L,  80 R. 
   Here, the angle of the above-mentioned straightening member  7  is changed due to the rotation thereof using the above-mentioned pivotally supporting portion P as the center of rotation. 
   Due to the above-mentioned operations, the angle of the straightening member  7  is changed thus capable of changing the angle of the straightening surface  71  with respect to the traveling wind. 
   Here, although the biasing force is applied to the straightening member using leaf springs in this mode, the present invention is not limited to this mode and the present invention can be exercised also using a biasing means which possesses a substantially equal biasing force as represented by a tensile spring or rubber. 
   Further, an angle variable range of the above-mentioned straightening member can be widened or narrowed by adjusting a height of the above-mentioned recessed plate  78 . The change of this angle variable range can be achieved by, for example, preparing straightening members having recessed plates which differ in height and by exchanging one straightening member with another straightening member which has the targeted recessed plate. 
   Further, the straightening member may be directly pivotally mounted on the ventilation cover. 
   Hereinafter, another angle changing structure of the straightening member  7  whose angle is changed is explained (see  FIG. 10  and  FIG. 11 ). 
   The angle changing structure of this mode is characterized by controlling the change of the angle and the fixing of the straightening member  7  using ratchets  8 . The explanation of parts which overlap the above-mentioned parts is omitted by giving the same symbols. 
   Further, since the ratchets  8  have the substantially same constitution as the previously-illustrated ratchets  5 , the detailed explanation of the ratchets  8  is omitted. The ratchets  8  are constituted of resilient fitting members  82 L,  82 R which are mounted on left and right side surfaces of the above-mentioned straightening member  7  and fitting recessed portions  83 L,  83 R which are formed on left and right side surfaces of the pivotally supporting plate  45  in a vertically extending manner. 
   That is, according to the angle changing structure of this mode, by vertically moving the rear end portion of the straightening member  8  with a force larger than a resilient force of the ratchets  8 , the straightening member  8  is rotated in the fore-and-aft direction and hence, the angle of the straightening member  8  can be changed. 
   Here, the angle variable range of the above-mentioned straightening member in this embodiment can be widened or narrowed corresponding to the number of indentations formed in the fitting recessed portion. That is, the change of the angel variable range can be achieved by, for example, preparing straightening members having fitting recessed portions which differ in the number of indentations and by exchanging one straightening member with another straightening member having the targeted fitting recessed portion. 
   Further, the straightening member may be directly pivotally supported on the ventilation cover. 
   Hereinafter, the slide structure and the angle changing structure of the straightening member in the helmet C of this mode are explained ( FIG. 12 ,  FIG. 13 ). 
   In the above-mentioned helmets A, B, the straightening members  4 ,  7  are formed in an associated manner with the above-mentioned ventilation covers  3 L,  3 R. However, this mode is directed to the helmet C in which the straightening member  9  is provided independently from the above-mentioned ventilation covers  3 L,  3 R. 
   The straightening member  9  shown in  FIG. 12  is constituted of a slide straightening member  91  which is provided slidably in the fore-and-aft direction with respect to the helmet body  1  and an angle changing straightening member  92  which is provided to a center portion of the slide straightening member  91  in a state that an angle of the angle changing straightening member  92  can be changed. 
   An elongated hole portion  93  is formed on a front side of the above-mentioned slide straightening member  91  to ensure a slide distance and a small bolt  12  is threaded into the helmet body  1  through the elongated hole portion  93 . Accordingly, by loosening or slacking the small bolt  12 , the slide straightening member  91  becomes slidable in the fore and aft direction. 
   Further, the above-mentioned angle changing straightening member  92  is configured to be rotated with respect to the slide straightening member  1  so as to change the angle of the straightening surface  94 . Accordingly, with respect to the angle changing structure, the angle changing structure in the above-mentioned helmet B is applicable and hence, the illustration and the explanation of the angle changing structure are omitted. 
   That is, the straightening member  9  shown in  FIG. 12  is characterized in that the slide straightening member  91  slides in the fore-and-aft direction with respect to the helmet body  1  so as to change the position of the straightening surface  94  and, at the same time, the angle changing straightening plate  92  is rotated to change the angle of the straightening surface  94 . 
   The straightening member  9  shown in  FIG. 13  is constituted of a fixed straightening member  95  which is fixed with respect to the helmet body  1  and an angle changing straightening member  96  which is mounted on a center portion of the fixed straightening member  95  in a state that an angle thereof can be changed. 
   The above-mentioned angle changing straightening member  96  is rotated with respect to the fixed straightening member  95  so as to change an angle of the straightening surface  94 . Accordingly, with respect to the angle changing structure, the angle changing structure in the above-mentioned helmet B is applicable and hence, the illustration and the explanation thereof are omitted. 
   That is, the straightening member  9  shown in  FIG. 12  is characterized in that the angle changing straightening plate  96  is rotated to change the angle of the straightening surface  94 . 
   The straightening member  10  shown in  FIG. 14  is characterized in that the straightening member  10  is mounted on the ventilation cover  3  in a state that the straightening member  10  is slidable in the fore-and-aft direction or an angle of the straightening member  10  is changeable. 
   The ventilation cover  3  of this mode is formed of an integral body which is formed by connecting left and right cover portions  30 L,  30 R by way of a connecting portion  30  arranged in front of a portion where the straightening member  10  is mounted. 
   In the drawing, numeral  300  indicates intake ports which are opened in distal ends of the cover portions  30 L,  30 R, numeral  301  indicates switch mechanism mounting holes which are opened in upper surfaces of the cover portions  30 L,  30 R to adjust an amount of air taken from the intake ports  300 , and numeral  302  indicates ventilation ports which are opened in rear ends of the cover portions  30 L,  30 R. 
   According to the ventilation cover  3  of this mode, the ventilation cover  3  and the straightening member  10  are formed into a unit and hence, the efficiency of the mounting operation can be enhanced. 
   Further, it is possible to provide the straightening member which can adjust the angle thereof with a minimum weight without damaging a function of a conventional ventilation cover and, at the same time, it is possible to provide a sophisticated ventilation cover in terms of design. 
   The present invention is not limited to the illustrated modes and the present invention can be exercised with constitutions which do not depart from contents described in respective claims in the Patent Claims. 
   Having described specific preferred embodiments of the invention with reference to the accompanying drawings, it will be appreciated that the present invention is not limited to those precise embodiments, and that various changes and modifications can be effected therein by one of ordinary skill in the art without departing from the scope of the invention as defined by the appended claims.