An air intake device for use in a helmet

Abstract: An air intake device of a helmet (1) having an openable shield (5) for covering a front opening of the helmet (1) includes a recess (29) formed near the front opening so as to produce a space between the shield (5) and the helmet surface, and air intake means (6) having a frame member (60), and a cover (63) for closing a front portion of the frame member (60), and guide means (8, 9, 65) for urging the cover (63) toward a clos­ ing state, and guiding the cover (63) from the closing state to an opening state, and keeping the cover (63) in either of the closing state and the opening state, the cover (63) being brought in the opening state to allow the air into the helmet (1) by pushing the cover (63) inward from the outside, and the cover (63) being brought in the closing state to block the air from flowing in by pushing the cover (63) inward another time.

Description: BACKGROUND OF THE INVENTION The present invention relates to a helmet in accordance to the preamble of claim 1. In a conventional full face type helmet for use with a motorcycle or the like, the inside of the helmet is liable to be stuffy. To eliminate this drawback, the helmet is provided with an air intake device. Specifically, through holes are formed in the body of the helmet. There is provided an openable shutter means over the through holes. The shutter means is slid to open to allow the air into the inside of the helmet, when necessary. Such a conventional helmet has the following problems. To attach the shutter means to the helmet body, it is necessary to form openings for holding the shutter means in the helmet body. This impaires the strength of the helmet body. To compensate impaired strength, the thickness of the helmet body is required to increase, which consequently increases the weight of the helmet. Also, the shutter means is required to be slid to open or close the through holes. This sliding operation is very cumbersome when riding a motorcycle. In DE-A-34 ⊘7 4⊘3, a helmet is disclosed, which comprises a side opening for air entrance. A cover is inserted into the opening, which is movable like a whip and can be operated by pressing the front or the rear end of the cover. However, the cover is not exactly guided and is therefore difficult and demands a concentrated action to bring the cover in a definite and stabile position. WO 86/⊘395⊘ shows another embodiment of a helmet comprising a front opening for air entrance, on the lower edge of which a flap is pivoted about a horizontal axis. For creating an air flow into the helmet the flap can be lowered, which has to be done against the air stream. Hence also this system is difficult to operate particularly under driving condition. GB-A-2 198 925 discloses a helmet with front openings for air entrance above and below a shield or visor. The front openings can be closed by plate-like valves which are laterally slidably. It is difficult to guide these valves so that they are easy to push from the closed to the open position and vice versa on the one hand and that they hold their position under the influence of the airstream and vibrations on the other hand. The present invention has overcome the above-mentioned problems. It is an object of the present invention to provide an air intake device for use in a helmet which makes it possible to open and close an air intake opening more rapidly and easier without impairing the strength of the helmet body. SUMMARY OF THE INVENTION Accordingly, the present invention provides a helmet which is characterized by a recess formed near an edge portion of the front opening of the helmet body so as to produce a space between the shield and an outer surface of the helmet body, a frame member located in said recess and having an opening in a front portion thereof providing an entry of air for said air flow passage, said cover closing and opening said opening and by guide means for rendering the cover reciprocatively movable in opposite radial directions of the helmet body, whereby said cover is brought into the opening state from the closing state by pushing it inward from the outside one time, and is brought into the closing state from the opening state by pushing it inward from the outside another time, said guide means including a guide cam having a guide groove and a guide pin movably placed in said guide groove. With the above construction, when the cover is pushed inward from the outside one time, the cover is moved in accordance with the guide means to provide the opening state to allow the air to flow into. When being pushed inward another time, the cover is restored to the closing state in accordance with the guide means. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view in a central section of a helmet showing an embodiment of the present invention; Fig. 2 is an enlarged sectional view of upper air intake means; Fig. 3 is a perspective view showing a frame member provided in the upper air intake means; Fig. 4 is a perspective view showing a rear part of a cover provided in the upper air intake means; Fig. 5 is a perspective view showing a guide cam provided in the upper air intake means; Fig. 6 is an enlarged sectional view of the upper air intake means, showing a state in which the air is allowed to flow into the inside of the helmet; Fig. 7 is an enlarged sectional view of lower air intake means; Fig. 8 is a perspective view showing a frame member provided in the lower air intake means; Fig. 9 is a perspective view showing a front part of a cover provided in the lower air intake means; and Fig. 10 is a perspective view showing a rear part of the cover. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Referring now to Fig. 1, a helmet 1 includes a body 2, a shock absorber liner 3 for absorbing impact, an inner pad 4 and an inner sheet 20. The body 2 is made of plastic such as fiber reinforced plastic (FRP). The shock absorber liner 3 is provided on an inner surface of the body 2. The inner pad 4 is provided on an inner surface of the shock absorber liner 3. A front opening portion is covered with a shield 5. The shield 5 is made of a transparent plate and can be opened and closed. The shield 5 is pivotally attached at sides of the body 2 by attachment members (not shown). The position of the shield 5 can be changed between a state in which the opening portion is covered and a state in which the shield 5 is positioned at an upper portion of the body 2 to open the opening portion. A trim member 24 is attached to a lower peripheral edge of the body 2. Upper air intake means 6 is provided above an upper edge of the front opening. Lower air intake means 7 is provided below a lower edge of the front opening. As shown in Figs. 2 to 5, the upper air intake means 6 includes a frame member 60, a cover 63 for closing a front portion of the frame member 60, and a guide cam 8 for guiding an movement of the cover 63. An opening portion 6a is formed in a front portion of the frame member 60. A pair of projections 64 are formed on a rear wall 60a. Each of the two projections 64 is formed with a recess 64a for receiving a spring to be described below. A support shaft 62 is provided in an upper portion of the frame member 60. The support shaft 62 extends in a transverse direction. The guide cam 8 is mounted on an intermediate portion of a lower wall 60b. As shown in Fig. 4, the cover 63 includes a plate-like member having such a size as to close the opening portion 6a. A cylindrical projection 63a extending in a vertical direction is integrally provided on an intermediate portion of the rear part of the cover 63. Also, an engaging member 63d is provided above the cylindrical projection 63a. The engaging member 63d is rotatably engaged with the support shaft 62. Further, a pair of recesses 63c for receiving the springs are formed in the portions of the cover 63 which are opposite to the recesses 64a respectively. The cylindrical projection 63a has a hollow 63b facing downward. In the hollow 63b are placed a guide pin 9 and a spring 91. The guide pin 9 is urged downward by the spring 91. As shown in Fig. 5, the guide cam 8 is formed with a guide groove 81 in an upper portion. The guide groove 81 is in the form of a heart and symmetrical with respect to a center line 100. The guide cam 8 has a stem 80 facing downward at one end thereof. The guide groove 81 has regions A, B, C, D, E, and F. A step 82 is formed between the regions A and F. A step 83 is formed between the regions C and D. The region A is lower than the region F. The region D is lower than the region C. The guide cam 8 is mounted on the lower wall 60b of the frame member 60 with the stem 80 being rotatably placed in a hold formed in the lower wall 60b, so that the guide cam 8 can be rotated about the stem 80. The engaging portion 63d of the cover 63 is rotatably attached on the support shaft 62 of the frame member 60. Compression springs 65 are provided between the recesses 63c in the rear part of the cover 63 and the recesses 64a of the frame member 60 respectively. Accordingly, the cover 63 is urged in such a direction as to close the opening portion 6a. The guide pin 9, being held in the cylindrical projection 63a of the cover 63, is positioned in the guide groove 81 of the guide cam 8. The guide pin 9 and the guide cam 8 constitute guide means for the cover 63. A recess 29 is formed in the vicinity of the upper edge of the front opening portion of the body 2 so that a space exists between the body 2 and the shield 5. The frame member 60 is fixedly placed in the recess 29 by adhesive or the like. In this state, the front surface of the frame member 60, the front surface of the cover 63 are flush with the surface of the body 2. A bottom plate 21 is provided on the underside of the frame member 60. A packing member 22 is provided in front of the bottom plate 21. The shield 5 is made to come in pressing contact with the packing 22 so that the front opening portion of the helmet is sealed. In rear of the bottom plate 21 is provided a bottom member including a core 32 covered with a cloth 33. An air permeable cloth 34 is provided between the bottom member and the inner sheet 20 provided thereabove. Consequently, a space 30 is defined by the bottom member, the cloth 34, and a lower wall 31 of the shock absorber liner 3. It should be noted that the same construction as the upper air intake means may be provided below the lower edge portion of the front opening portion of the body 2 with being symmetrical with the upper air intake means with respect to a center transverse line of the front opening portion. With the above construction, in a normal state, i.e., the state of Fig. 2, the opening portion 6a of the frame member 60 is closed with the cover 63 so that the air flow is blocked. In this time, the guide pin 9 is stopped on the center line 100 passing through the region A. When the cover 63 is pushed inward against the biasing force of the spring 65 by hand from the outside, the guide pin 9 is moved from the regions A, to B, and to C in a counterclockwise direction because of the fact that the clockwise movement of the guide pin 9 is blocked by the step 82. It is actual that the guide pin 9 moves substantially straightforward. Therefore, the guide cam 8 is rotated about the stem 80 so as to allow the guide pin 9 to move straightforward. When the cover 63 is fully pushed inward, the guide pin 9 is in the region C. If this hand pushing is released in this state, the guide pin 9 moves beyond the step 83 to the region D where the center line 100 passes. In other words, the guide pin 9 is changed from a state in which the guide pin 9 is made in pressing contact with an outer wall 81a of the guide groove 81 to another state in which the guide pin 9 is made in pressing contact with an inner wall 81b. The guide pin 9 is then pressed against a recessed portion of the inner wall 81b, and stopped on the center line 100. The cover 63 comes into the state shown in Figs. 3 and 6. Consequently, as shown in Fig. 3, an air intake opening 60c comes to existence in both sides of the cover 63. The air is allowed to flow into the space 30 through the air intake opening 60c, and then into the helmet through the air permeable cloth 34. When the cover 63 is further pushed inward from the outside by hand, the guide pin 9 in the region D is made to come into pressing contact with the outer wall 81a of the guide groove 81, and then moved to a portion between the region D and the region E. Thereafter, when the hand pushing is released, the cover 63 is pressed forward due to the spring 65, so that the guide pin 9 is moved in the counterclockwise direction from the region D, to the region E, and to the region F. In this case, the guide cam 8 is rotated about the stem 80 so as to allow the guide pin 9 to move along the above path. The guide pin 9 is moved beyond the step 82 from the region F to the region A where the center line 100 passes, and then stopped in the region A. Consequently, the cover 63 is returned to the state to close the opening portion 6a of the frame member 60. Accordingly, it will be understood that the air intake means can be opened and closed by merely pushing the cover 63 from the outside. This actuation is very easy. As shown in Figs. 7 to 10, the lower air intake means 7 includes a frame member 70, a cover 73 and a guide cam 8. The cover 73 close an opening formed in a front portion of the frame member 70. The guide cam 8 is adopted for guiding the movement of the cover 73. A rectangular projection 71 is provided on an intermediate portion of an inner wall 74. The rectangular projection 71 has a hollow 71a. On both sides of the rectangular projection 71 are provided a pair of cylindrical projections 76 for receiving springs. Also, a cylindrical projection 78 is formed on the underside of the rectangular projection 71. The projection 78 has a hollow for holding a guide pin 9 and a spring 91. The guide pin 9 is urged upward by the spring 91 so that a top end portion of the guide pin 9 is projected in the hollow 71a. Openings 79 are formed in corner portions between the inner wall 74 and both side walls 72. Further, a plurality of recesses 75a are formed in an inner portion of a lower wall 75 to allow the air to flow into the inside of the helmet. The cover 73 includes a plate-like member having such a size as to cover the front opening of the frame member 70. In addition, a projection 73e is formed on an intermediate portion of the back of the cover 73. The projection 73e has a recess facing downward and is movably inserted into the hollow 71a of the rectangular projection 71. In both sides of the projection 73e are recesses 73c for receiving springs. Further, the cover 73 has projections 73a on both side ends thereof. The projections 73a are placed in the openings 79 when the cover 73 is mounted on the frame member 70. The movement of the cover 73 is restricted by the combination of the projections 73a and the openings 79. The guide cam 8 shown in Fig. 5 is placed in the recess formed in the underside of the projection 73e with the guide cam 8 facing downward and rotatable about the stem 80. The projection 73e of the cover 73 is inserted into the hollow 71a of the frame member 70. The projections 73a on both sides are placed in the openings 79. Compression springs 77 are provided between the recesses 73c in the back of the cover 73 and the projections 76 of the frame member 70 respectively. The compression spring 77 applies a forward pressure to the cover 73 so that the cover 73 close the opening portion of the frame member 70. The guide pin 9 held in the projection 78 of the frame member 70 is positioned in the guide groove 81 of the guide cam 8. A recess is formed below the lower edge portion of the front opening portion of the body 2 so as to provide a space between the body 2 and the shield 5. The recess has an opening 28. The frame member 70 is fixedly placed in the opening 28 by adhesive or other way. In this state, the surface of the frame member 70 and the surface of the cover 73 are flush with the surface of the body 2. Also, a space 40 is provided between the inner wall of the frame member 70 and the inner wall of the recess. An upper wall 42 is provided in an upper portion of the space 40. The upper wall 42 has an air intake hole 43. A packing 22 is provided on front of the upper wall 42. The shield 5 is made in pressing contact with the packing 22 so that the front opening portion of the helmet is sealed. With the above construction, in a normal state, i.e., the state of Fig. 7, the front opening portion of the frame member 70 is closed with the cover 73 so that the air flow is blocked. When being pushed against the urging force of the spring 77 from the outside, the cover 73 is moved inward in parallel owing to the fact that the relative movement of the guide pin 9 and the guide cam 8, and the insertion of the projection 73e in the hollow 7a of the rectangular projection 71. Thereafter, the cover 73 is kept in a halting position by the guide cam 8, that is, the state shown in phantom lines in Fig. 7. In this state, the air is allowed to flow into the space 40 through the openings 79 in the both sides of the frame member 70, and then into the inside of the helmet through the hole 43. At the same time, the recesses 75a formed in the lower portion of the frame member 70 are opened, so that the inside of the helmet is communicated with the outside through the recesses 75a, adn the air is allowed to flow through the recesses 75a. When being pushed inward again, the cover 73 is pushed forward by the urging force of the spring 77 and then returned to its original state. With this construction, opening and closing can be effected by merely pushing the cover 73 from the outside. As described above, in an air intake device of the present invention, an air intake state can be attained by pushing a cover from the outside one time to move inward along guide means, and an original state, i.e., air non-intake state can be attained by pushing the cover another time to move forward along the guide means. It will be understood that this operation is very simple. Also, an air intake device of the present invention can be mounted in a recess formed in the vicinity of an edge portion of a helmet, which thus will not involve the impairment of the strength of a helmet.

Claims: A helmet comprising a helmet body (2), an openable shield (5) for covering an opening formed in a front portion of the helmet body (2); and air intake means (6, 7) including: an air flow passage (3⊘, 43) for communicating an outside of the helmet body (2) with an inside of the helmet body (2), a cover (63, 73) movable from a closed position of closing the air flow passage (3⊘, 43) to an open position of opening the air flow passage (3⊘, 43) and vice versa, first holding means (65, 77) for holding the cover (63, 73) in the closed position, and second holding means (91) for holding the cover (63, 73) in the open position, characterized by a recess (29) formed near an edge portion of the front opening of the helmet body so as to produce a space between the shield (5) and an outer surface of the helmet body, a frame member (6⊘) located in said recess (29) and having an opening (6a) in a front portion thereof providing an entry of air for said air flow passage (3⊘, 43) said cover (63, 73) closing and opening said opening (6a), guide means (8, 9) for rendering the cover (63, 73) reciprocatively movable in opposite radial directions of the helmet body (2); whereby said cover (63, 73) is brought into the opening state from the closing state by pushing it inward from the outside one time, and is brought into the closing state from the opening state by pushing it inward from the outside another time, said guide means including a guide cam (8) having a guide groove (81) and a guide pin (9) movably placed in said guide groove (81). A helmet according to claim 1 wherein the guide groove (81) has the form of a heart. A helmet according to claims 1 or 2 wherein the guide cam (8) is supported on the helmet body (2) and the guide pin (9) is supported on the cover (63). A helmet according to claim 3 wherein the cover (63) is formed with a hollow (63b) extending in a vertical direction, and the guide pin (9) is vertically movably placed in the hollow (63b), and a spring (91) is provided in the hollow (63b) to urge the guide pin (9) downward. A helmet according to claims 1 or 2 wherein the guide cam (8) is supported on the cover (73) and the guide pin (9) is supported on the helmet body (2). A helmet according to any of claims 1 to 5 wherein the air intake means (6) further includes a support shaft (62) arranged in a widthwise direction for supporting an upper portion of the cover (63). A helmet according to any of claims 1 to 6 wherein the air intake means (7) further includes: a support frame (7⊘) attached on the helmed body (2), the support frame (7⊘) having a projection (71) extending in the radial direction and formed with a hollow (71a), and a projection (73e) provided on the cover (73) and engageable with the hollow (71a) of the projection (71). A helmet according to claim 7 wherein the guide cam (8) is formed in the projection (73e).

Inventors: SHIMADA YOSHIHIRO C O YAMAHA H, SHIMADA, YOSHIHIRO, C/O YAMAHA HATSUDOKI K.K.
Applicants: YAMAHA MOTOR CO LTD, YAMAHA HATSUDOKI KABUSHIKI KAISHA
Application year: 1990
Main classification: A42B3
IPC codes: A42B3