Shield plate mounting structure for helmet

Abstract: A shield plate mounting structure for a helmet in which a cover (6) mounted on a mounting base plate (5) fixed to an outer surface of a cap body (1) to support the end portion of a shield plate (3) includes a cover main body portion (14) for covering the end portion (3a) of the shield plate (3), and an extension plate portion (15) continuously formed with the cover main body portion (14), the cover main body portion (14) being engaged with the mounting base plate (5) through engaging means for allowing engaging and disengaging operation, the extension plate portion (15) is provided with a locking hole (23), an engaging member (26) to be inserted into the locking hole (23) in a state where the cover main body portion (14) is engaged with the mounting base plate (5) being disposed on the mounting base plate (5) for operating between a position for engaging the engaging member (26) with the peripheral edge of the locking hole (23) and a position for disengaging the engagement of the engaging member (26) from the locking hole (23). Mounting and dismounting of the shield plate (3) on or from the cap body (1) can be easily conducted without tool.

Description: This invention relates to a structure for mounting a shield plate or visor on a cap body of a helmet wherein a mounting base plate having a pivot section for turnably supporting an end portion of the shield plate is fixedly secured to an outer surface of the cap body and a cover for covering the end portion of the shield plate is detachably mounted on the mounting base plate. In conventional mounting structures, screws have been employed for holding the shield plate onto the pivot section or for attaching the cover to the cap body, for example, as disclosed in Japanese Utility Model Laid-Open No. 64-10035 and Japanese Utility Model Publication No. 63-15314. In general, a helmet visor may be exchanged for a so-called clear type or a sunshade (tinted) type dependent on a user's preference. According to the conventional structure as described above, screws must be detached and attached every time the visor is exchanged. Such an operation is troublesome . JP-A-2-53904 shows a helmet having a detachable visor which is connected to the helmet by means of respective two part hinged cover plates secured to the sides of the helmet shell. Each cover plate comprises a base plate secured to the helmet by a screw and a visor retaining cover pivotably supported on the base plate. The base plate has a central raised portion which received a hole formed in the end of the visor. Once the visor has been located over the raised portion the cover is pivoted down onto the base plate, thereby trapping the visor between the cover and the base plate. The cover is held in position over the base plate by means of a simple friction engagement of a resilient projection on the cover which is received in a corresponding recess formed in the outer end of the raised portion of the base plate. A particular disadvantage of the arrangement disclosed in JP-A-2-53904 is that the cover can be vibrated or forced open by air flow over the helmet and thus can become detached in use. EP-A-294676 shows another helmet having a two-part cover plate to secure a visor. However, rather than the two parts of the plate being hinged together, they are entirely separate. To install a visor the end of the visor is fitted to a base plate as in JP-A-2-53904. Then the cover is fitted over the base plate and is retained on the base plate by a finger releasable latch. Although in this arrangement, the cover is less likely to become detached by vibration or wind pressure alone, the finger releasable latch remains exposed when the cover is fitted over the base plate and can be inadvertently operated by a person wearing or, in particular, carrying the helmet. According to the present invention, there is provided a shield plate mounting structure for a helmet which has a cap body, a shield plate detachably mounted on the cap body, and a cover for covering an end portion of the shield plate, the mounting structure comprising: a mounting base plate fixed to an outer surface of the cap body and having a pivot section turnably supporting the end portion of the shield plate, the cover being detachably mounted on the mounting base plate; a cover main body portion covering the end portion of the shield plate, the cover main body portion having an engaging device for engaging the mounting base plate so as to permit an engaging and disengaging operation in a linear engaging and disengaging direction set substantially perpendicular to an axis of the pivot section; characterized in that an extension plate portion is integrally formed with the cover main body portion, the extension plate portion including a locking hole, an engaging member being provided on the mounting base plate so as to pass through the locking hole when the cover main body portion is engaged with the mounting base plate, the engaging member being operable between a position of engaging with a peripheral edge of the locking hole and a position of being released from engagement, and a lid portion supported on the cover main body portion, the lid portion being turnable between a closed position for covering the extension plate portion and an opened position for externally exposing the extension plate portion, and further the lid portion being capable of resiliently engaging the extension plate portion. With such a construction, when mounting the shield plate on the cap body, the end portion of the shield plate is first superposed on the mounting base plate fixed to the cap body. The cover is then superposed on the shield plate. The cover main body portion is operated in its engaging and disengaging direction to be engaged with the mounting base plate. Then, after the engaging member is inserted into the locking hole, the engaging member is operated in the direction to be engaged with the edge of the locking hole to secure the cover to the mounting base plate. For detaching the shield plate from the cap body, the reverse operation to that described above is conducted. In both operations, a tool is not required. For a better understanding of the present invention and to show more clearly how it may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:- Fig. 1 is a side view of a helmet according to the present invention; Fig. 2 is an enlarged view of an essential portion of Fig. 1; Fig. 3 is an exploded perspective view of a mounting structure; Fig. 4 is a side view corresponding to Fig. 2 in a state where a cover is removed; Fig. 5 is a sectional view taken along the line V - V of fig. 2; Fig. 6 is a side view corresponding to Fig. 2 in a state where a lid is opened; Fig. 7 is an enlarged sectional view taken along the line VII - VII of Fig. 2; Fig. 8 is an enlarged sectional view taken along the line VII - VIII of Fig. 2; and Fig. 9 is an enlarged sectional view taken along the line IX - IX of Fig. 2. Referring first to Fig. 1, the illustrated helmet is a so-called jet or open face type helmet. Left and right end portions 3a of a shield plate or visor 3 made of synthetic resin are attached to left and right side walls of a cap body 1 for opening and closing a window 2 provided in a front wall of the cap body 1 by means of a mounting structure. The shield plate 3 can be pivoted in a click stop manner between a closed position indicated by a solid line and an opened position indicated by a dotted broken line in Fig. 1. Referring also to Figs. 2 to 5, a mounting base plate 5 made of synthetic resin is fixedly secured to an outer surface of each of the left and right side walls of the cap body 1. The mounting base plate 5 has a pivot section 4 for turnably supporting the end portion 3a of the shield plate 3. A cover 6 made of synthetic resin is detachably mounted on the mounting base plate 5 for covering the end portion 3a of the shield plate 3. The mounting base plate 5 is secured at upper and lower positions thereof to left and right outer surfaces of the cap body 1 with screws 7 and 8. The cylindrical pivot section 4 surrounding the head of the upper screw 7 is integrally formed with and projects from the surface of the mounting base plate 5 and has an axial length corresponding to the thickness of the end portion 3a of the shield plate 3. An axial hole 9 is formed in the end portion 3a of the shield plate 3. The pivot section 4 is turnably fitted in the axial hole 9 of the shield plate 3 to turnably support the shield plate 3 about the pivot section 4. A restricting projection 10 in contact with the outer peripheral edge of the end portion 3a of the shield plate 3 projects from the mounting base plate 5 and defines the upper limit position of the turning movement of the shield plate 3. Provided on the lower outer peripheral end portion 3a of the shield plate 3 are a plurality of click teeth 11 which are arranged on a concentric circle with respect to the axial hole 9 of the shield plate 3. A resilient arm 12 is formed by cutting out a part of the mounting base plate 5, and a click tooth 13 provided at a distal end of the resilient arm 12 is resiliently engaged with a part of the click teeth 11 of the shield plate 3. Thus, the shield plate 3 may be held at any one of a plurality of predetermined positions by the resilient engagement of the click tooth 13 with the click teeth 11. The cover 6 comprises a main body 14 detachably engaged with the mounting base plate 5 to cover the end portion 3a of the shield plate 3, an extension plate 15 integrally formed with the main body 14 for closely contacting with the surface of the mounting base plate 5, and a lid 16 rotatably supported by the main body 14 for covering the extension plate 15. A leg 17 projects from the inner surface at the peripheral edge of the main body 14. The inner surface of the main body 14 is brought into abutment against the end face of the pivot section 4 in a state where the leg 17 abuts against the outer surface of the cap body 1 and the main body 14 is engaged with the mounting base plate 5. A part of the leg 17 corresponding to the turning range of the shield plate 3 is eliminated so that the shield plate 3 which is sandwiched between the main body 14 and the mounting base plate 5 can be turned. The main body 14 is engageable with the mounting base plate 5 by the operation along a linear engaging or disengaging direction 18 which is substantially perpendicular to an axis of the pivot section 4. More particularly, a rectangular slot 19 is provided in the mounting base plate 5 and extends along the engaging and disengaging direction 18 under a base end of the pivot section 4, and a locking portion 20 is integrally formed on the mounting base plate 5 at a position lower than the end portion 3a of the shield plate 3 when it is in the closed position. The locking portion 20 is formed to be opposed to the surface of the mounting base plate 5 with a rear side of the locking portion 20 (at the right side in Figs. 3 and 4) along the engaging and disengaging direction 18 and an upper portion of the locking portion 20 opened. The inner surface of the main body 14 is integrally provided with an L-shaped engaging pawl 21 to be received in the slot 19 within the pivot section 4. The engaging pawl 21 can be engaged and held under the base of the pivot section 4 by the forward (leftward in Figs. 3 and 4) movement along the engaging and disengaging direction 18 from the state where the engaging pawl 21 is received in the slot 19 within the pivot section 4. Furthermore, the inner surface of the main body 14 is also integrally provided with an L-shaped engaging pawl 22 to be engaged with the locking portion 20 by the forward movement from the rear side of the locking portion 20 along the engaging and disengaging direction 18. The slot 19 and the engaging pawl 21 as well as the locking portion 20 and the engaging pawl 22 constitute engaging means, respectively. Since one of the engaging means is arranged lower than the end portion 3a of the shield plate 3 when the shield plate 3 is closed, the opening and closing operations of the shield plate 3 are not disturbed at all by the engaging means. Referring also to Figs. 6, 7 and 8, the extension plate 15 of the cover 6 is integrally formed with the main body 14 and is less thick than the main body 14 so that it can closely contact the surface of the mounting base plate 5 in the condition in which the main body 14 is engaged with the mounting base plate 6. A rectangular locking hole 23 extending vertically across the engaging and disengaging direction 18 is formed in the extension plate 15 of the cover 6. A guide hole 24 is formed in the mounting base plate 5 to extend vertically, and a rectangular supporting frame 25 is integrally formed with the mounting base plate 5 over an upper portion of the guide hole 24. The supporting frame 25 is inserted into the locking hole 23 in a state where the main body 14 is engaged with the mounting base plate 5. When the supporting frame 25 is fitted in the locking hole 23, the outer surface of the supporting frame 25 is flush with the surface of the extension plate 15. A slit 27 extending longitudinally of the guide hole 24 is formed in the supporting frame 25. An engaging member 26 to be engaged with the peripheral edge of the locking hole 23 is supported on the supporting frame 25. The engaging member 26 is comprised of an engaging plate 26a slidable along the surface of the supporting frame 25, a moving plate 26b movable along the guide hole 24, and a coupling portion 26c movably fitted in the slit 27 for coupling the engaging plate 26a and the moving plate 26b. The moving plate 26b is formed substantially in the same rectangular shape as the supporting frame 25. The lower end of the engaging plate 26a is projected downward lower than the lower end of the coupling portion 26c, and an engaging recess 28 is formed on an inner surface of the lower end of the engaging plate 26a. A locking projection 29 to be engaged with engaging recess 28 projects from the surface of the extension plate 15 at the lower edge around the locking hole 23. An operating knob 30 projects from the engaging plate 26a. With such a construction, when the main body 14 of the cover 6 is engaged with the mounting base plate 5 in a state where the engaging member 26 is located at its upper position where the engaging plate 26a does not protrude from the supporting frame portion 26, the supporting frame 25 can be inserted in the locking hole 23 of the extension plate 15. When the engaging member 26 is moved downward by the operating knob 30 in this state, the engaging plate 26a rides on the locking projection 29 to resiliently engage the locking projection 29 with the engaging recess 28. Referring also to Fig. 9, the lid 16 of the cover 6 is supported on the main body 14 for turning between its closing position (the position shown in Fig. 2) for covering the extension plate 15 where the lid 16 is flush with the main body 14 and its opening position (the position shown in Fig. 6) for externally exposing the extension plate 15. In other words, a rectangular notch 31 is provided at the rear of the main body 14, and an arm 32 disposed in the notch 31 is provided at the lid 16 of the cover 6. A pair of bearings 34 are integrally formed with inner surfaces of both upper and lower ends of the arm 32, and a pair of shafts 33 are fitted into respective bearings 34 from one end thereof. U-shaped brackets 35 are integrally formed on the inner surface of the main body 14 at the upper and lower edges of the notch 31, and the other ends of the shafts 33 are resiliently and turnably held by the brackets 35, respectively. According, the lid 16 is turnably supported to the main body 14 through the shafts 33. A leg 36 projects from the inner surface of the peripheral edge of the lid 16 excluding the cover main body portion 14 side, and the outer surface of the lid 16 becomes substantially flush with the outer surface of the main body 14 in a state where the leg 36 is brought into contact with the outer surface of the cap body 1. An engaging pawl 37 projects from the inner surface of the lid 16 of the cover 6, and a locking portion 38 to be resiliently engaged with the engaging pawl 37 is provided at the extension plate 15 of the cover 6. Accordingly, the engaging pawl 37 is resiliently engaged with the locking portion 38 to retain the lid 16 in position over the extension plate 15. An operating recess 39 is provided at the side portion opposite to the arm 31 of the lid 16, and, when the lid 16 is to be opened from the condition in which it covers the extension plate 15, a finger can be inserted in the operating recess 39. A restricting recess 42 to be engaged with the operating knob 30 is provided in the inner surface of the lid 16 in the condition in which the engaging plate 26a of the engaging member 26 is engaged with the lower edge of the locking hole 23. Recesses 40 are provided at both sides of the window 2 of the cap body 1. A mounting base plate 5 is disposed in each recess 40, and the outer surface of the cover 6 which is mounted on the cap body 1 becomes substantially flush with the outer surface of the cap body 1. A description will now be made of the operation of this embodiment. When mounting the shield plate 3 on the cap body 1, the end portion 3a of the shield plate 3 is superposed on the mounting base plate 5 which is fixedly secured to the cap body 1, so that the pivot section 4 is inserted in the axial hole 9 of the end portion 3a of the shield plate 3. Then, the lid 16 of the cover 6 is opened to externally expose the extension plate 15. In a condition in which the engaging member 26 is located at a position corresponding to the supporting frame 25, the cover 6 is superposed on the end portion 3a of the shield plate 3 while advancing the main body 14 forwardly along the engaging and disengaging direction 18. In this way the engaging pawl 21 is engaged with the base end of the pivot section 4 through the slot 19, and the engaging pawl 22 is engaged with the locking portion 20. Accordingly, the main body 14 is engaged with the mounting base plate 5. The engaging member 26 is inserted into the locking hole 23 in this condition and the engaging member 26 is operated downwardly to resiliently be engaged with the lower peripheral end of the locking hole 23, thereby fixing the cover 6 to the mounting base plate 5. Then, the lid 16 is turned to its closing position, until the engaging pawl 37 is resiliently engaged with the locking portion 38, thereby completing the mounting of the shield plate 3 on the cap body 1. In this mounting operation, a detaching and attaching operation of screws is eliminated, so that the shield plate 3 can be mounted very easily. In addition, when the lid 16 is closed, it covers the engaging member 26 and prevents the engaging member from coming into contact with foreign objects etc. Further, the operating knob 30 is fitted in the restricting recess 42 to restrict the movement of the engaging member 26. Accordingly, unless the lid 16 is opened, there is no fear of erroneously releasing the engagement of the engaging member 26 with the extension plate 15 of the cover 6. In the case of removing the shield plate 3 from the cap body 1, the reverse operation to that described above is performed. In both the operations, the detaching and attaching operation of screws are eliminated, resulting in simple operations to detach and attach the shield plate 3, and hence, the shield plate 3 can be exchanged easily. In the embodiment described above, the structure of the present invention is applied to the jet or open face type helmet. However, the present invention may also be applied to a full-face type helmet.

Claims: A shield plate mounting structure for a helmet which has a cap body (1), a shield plate (3) detachably mounted on the cap body (1), and a cover (6) for covering an end portion (3a) of the shield plate (3), the mounting structure comprising: a mounting base plate (5) fixed to an outer surface of the cap body (1) and having a pivot section (4) turnably supporting the end portion (3a) of the shield plate (3), the cover (6) being detachably mounted on the mounting base plate (5); a cover main body portion (14) covering the end portion (3a) of the shield plate (3), the cover main body portion (14) having an engaging device for engaging the mounting base plate (5) so as to permit an engaging and disengaging operation in a linear engaging and disengaging direction (18) set substantially perpendicular to an axis of the pivot section (4); characterized in that an extension plate portion (15) is integrally formed with the cover main body portion (14), the extension plate portion (15) including a locking hole (23), an engaging member (26) being provided on the mounting base plate (5) so as to pass through the locking hole (23) when the cover main body portion (14) is engaged with the mounting base plate (5), the engaging member (26) being operable between a position of engaging with a peripheral edge of the locking hole (23) and a position of being released from engagement, and a lid portion (16) supported on the cover main body portion (14), the lid portion (16) being turnable between a closed position for covering the extension plate portion (15) and an opened position for externally exposing the extension plate portion (15), the lid portion (16) being capable of resiliently engaging the extension plate portion (15). A shield plate mounting structure for a helmet as claimed in claim 1, characterised in that the pivot section (4) is cylindrical, and the engaging device includes first engaging means (19, 21) disposed in the cylindrical pivot section (4). A shield plate mounting structure for a helmet as claimed in claim 2, characterised in that the first engaging means includes a rectangular slot (19) extending along the engaging and disengaging direction (18) and provided in the mounting base plate (5) to pass through the base portion of the pivot section (4), and a substantially L-shaped first engaging pawl (21) that is provided on an inner surface of the cover main body portion (14) for engaging with the slot (19) so as to be engaged with the base portion of the pivot section (4) by the movement of the first engaging pawl (21) in the slot (19) along the engaging and disengaging direction. A shield plate mounting structure for a helmet as claimed in claim 2 or 3, characterised in that the engaging device further includes second engaging means (20, 22) disposed below the end portion (3a) of the shield plate at the closed position thereof. A shield plate mounting structure for a helmet as claimed in claim 4, characterised in that the second engaging means includes a locking portion (20) integrally provided on the mounting base plate (5) and opened at one side along the engaging and disengaging direction (18) so as to be opposed to the surface of the mounting base plate (5), and a substantially L-shaped second engaging pawl (22) provided on the inner surface of the cover main body portion (14) so as to be engaged with the locking portion (20) by the movement of the second engaging pawl (22) along the engaging and disengaging direction (18). A shield plate mounting structure for a helmet as claimed in any one of the preceding claims, characterised in that the engaging member (26) is provided with an engaging recess (28), and a locking projection (29) to be resiliently engaged with the engaging recess (28) projects from the edge of the locking hole (23) so as to maintain the engagement of the engaging member (26) with the edge of the locking hole (23). A shield plate mounting structure for a helmet as claimed in any one of the preceding claims, characterised in that the means for resiliently engaging the lid portion (16) with the extension plate portion (15) is comprised of a locking portion (38) formed on an inner surface of the lid portion (16), and an engaging pawl (37) provided on the extension plate portion (15) to be resiliently engaged with the locking portion (38). A shield plate mounting structure for a helmet as claimed in any one of the preceding claims, characterised in that the lid portion (16) is provided at an inner surface thereof with a restricting recess (42) for receiving an operating knob (30) formed on an outer surface of the engaging member (26) when the lid portion (16) is located at its closed position in a condition in which the engaging member (26) is engaged with the peripheral edge of the locking hole (23).

Inventors: KAMATA EITARO, KAMATA, EITARO
Applicants: SHOEI KAKO KK, SHOEI KAKO KABUSHIKI KAISHA
Application year: 1990
Main classification: A42B3
IPC codes: A42B3