Helmet shield attachment mechanism and protective helmet equipped with such a shield attachment mechanism

Abstract

The present invention relates to a helmet shield attachment mechanism (10) comprising a shield attachment base member (12) and a shield (14). The shield attachment base member (12) comprises a fixed base member (18) designed to be fixed to the shell (2) and a movable base member (20) coupled to the fixed base member (18) and the shield (14). In accordance with the present invention, the shield attachment base member (12) further comprises an actuating base member (22) pivotally connected to the fixed base member (18), the actuating base member (22) adapted to rotate along a curved path and abut the movable base member (20), thereby moving the movable base member (20) relative to the fixed base member (18) during rotation of the shield (14). The present invention also relates to a protective helmet (1) comprising such a shield attachment mechanism (10).

Description

[Technical Field]

[0001] The present invention relates to a helmet shield attachment mechanism, particularly, but not exclusively, to a helmet shield attachment mechanism configured for use in conjunction with a protective motorcycle helmet.

[0002] The present invention also relates to a protective helmet equipped with such a shield mounting mechanism. [Background technology]

[0003] As is known in the art, the shell of a full-face helmet typically has a front opening called an "eye port" that allows the user to see ahead of him. Many helmets have this opening covered by a shield attached to the shell.

[0004] The shield is a transparent protective screen that extends over the user's eyes and covers all or part of his / her face.

[0005] The shield must be operable between at least two positions: a "fully closed" position, in which the shield closes the eyeport and protects the user's face, and a "fully open" position, in which the shield is moved upward and no longer closes the eyeport, leaving the user's face unprotected.

[0006] As required by current safety helmet standards (see, for example, Article 6.16.1 of Regulation UNECE 22.06), the shield must be removably attached to the helmet shell, and at the same time, it must be able to be removed from view with a simple movement of one hand.

[0007] Typically, the shield is attached to the helmet by a shield attachment mechanism.

[0008] Such a mechanism must be durable, precise in operation, and allow for easy and quick removal and installation of the shield.

[0009] A common mechanism allows the shield to rotate around a fixed point and move along a circular orbit, but this configuration has several drawbacks.

[0010] First, during travel, when the shield reaches the "fully closed" position, it rubs against the gasket used to seal the eyeport, causing premature wear of the gasket.

[0011] A further drawback is that when the shield reaches the "fully open" position, it protrudes from the outer surface of the shell and moves away from the shell, which increases the overall volume of the helmet.

[0012] Attachment mechanisms that allow rotational and translational movement of the shield are also known.

[0013] These mechanisms allow to overcome the above-mentioned drawbacks and are usually formed by a base member attached to the shell of the helmet and the shield itself, which in turn comprises a fixed base member fixed to the shell of the helmet and a movable base member attached to the fixed base member and movable in a reciprocating manner along a linear axis relative to the fixed base member.

[0014] The shield is pivotally supported by a movable base member, and in this way the centre of rotation of the shield is moved during movement of the shield in a manner controlled by the mechanism itself.

[0015] In particular, at the beginning of the opening of the shield, i.e., when the shield begins to move from the "fully closed" position towards the "fully open" position, the shield may move forward by spacing itself away from the shell by a distance that is typically about 3 mm.

[0016] This possibility of having a forward movement allows the shield to obtain a certain intermediate position, the so-called "city position", in which a reduced flow of air can enter the helmet interior. Such air flow is useful in acting as an anti-fog and in providing a cooling effect.

[0017] When the shield is moved upward from the "city position" towards the "open" position, the shield undergoes a substantial rotational movement.

[0018] Finally, near the final position, i.e., when the "fully open" position is nearly reached, the shield moves rearward toward the outer shell, decreasing its distance from the outer shell and, consequently, decreasing the overall volume of the helmet.

[0019] Movement from the "fully open" position to the "fully closed" position occurs in the same manner, but in the reverse order.

[0020] Advantageously, as the shield reaches the "fully closed" position from the "city position," it experiences a rearward movement so that it does not rub against the sealing gasket of the shell's eye port, thereby preventing premature wear of the gasket.

[0021] The first example of a rotation-translation mounting mechanism is disclosed in US Pat. No. 5,629,999.

[0022] In the shield mounting mechanism of Patent Document 1, a cam surface is provided on the shield, and a cam follower portion is provided on the fixed base member, and the cam follower portion is capable of contacting the cam surface.

[0023] When a force in a generally upward direction is applied to the shield in the "fully closed" position, the cam follower portion follows the cam surface, and the shield can therefore move forward together with the movable base member.

[0024] When the shield reaches the "open" position, the cam follower is positioned in a recess in the cam surface, and the shield can be pulled rearwardly towards the outer shell due to the provision of elastic means provided between the movable base member and the fixed base member.

[0025] A second example of a rotation-translation mounting mechanism is disclosed in US Pat. No. 6,233,999.

[0026] The mechanism of US Pat. No. 5,699,499 differs from that of US Pat. No. 5,699,499 in that the fixed base member is provided with stop means designed to interact with corresponding stop means provided on the movable base member.

[0027] By varying the relative position between the stop means and the stopping means, the position of the shield relative to the outer shell, at least in the fully closed position, can be adjusted.

[0028] Neither mechanic, however appreciated, is without its drawbacks.

[0029] In fact, the above-mentioned mechanism has a complex structure, which makes it difficult to assemble the mechanism and subsequently to mount it on the helmet.

[0030] Furthermore, the adjustment work to arrive at a satisfactory position of the shield relative to the outer shell to have a reliable "fully closed" position and to obtain reliable intermediate positions is time consuming and must be performed by a skilled technician.

[0031] Furthermore, the interaction between the cam surface and cam follower, even if reliable, can cause jerky motion that can disturb the user during operation of the shield.

[0032] Finally, slippage between the cam surface and the cam follower can result in premature wear of these components. [Prior art documents] [Patent documents]

[0033] [Patent Document 1] European Patent No. 1856999 [Patent Document 2] European Patent No. 2810577 Summary of the Invention [Problem to be solved by the invention]

[0034] SUMMARY OF THE INVENTION It is therefore a primary object of the present invention to provide a helmet shield attachment mechanism that at least partially overcomes the problems and drawbacks discussed above.

[0035] In particular, it is an object of the present invention to provide a helmet shield attachment mechanism that can be easily and quickly operated.

[0036] Another object of the present invention is to provide a helmet shield attachment mechanism having a simplified and reliable construction.

[0037] It is a further object of the present invention to provide a helmet shield attachment mechanism having a structure that allows for precise movement of the shield and reduces the risk of wear due to sliding friction between components of the mechanism.

[0038] Finally, it is an object of the present invention to provide a protective helmet having a shield that can be easily manipulated without affecting the overall dimensions of the helmet. [Means for solving the problem]

[0039] These and other main objects and aims, which will become more apparent from the following description, are achieved by a helmet shield attachment mechanism according to claim 1 and a protective helmet according to claim 18.

[0040] The advantages and characteristic features of the present invention will become more apparent from the following description of preferred, but non-exclusive, embodiments of the invention, which refers to the accompanying drawings. [Brief explanation of the drawings]

[0041] [Figure 1] FIG. 1 is a side view of the protective helmet of the present invention with the shield in a "fully closed" position. [Figure 2] 2 is a side view of the protective helmet of FIG. 1 with the shield in the "middle" position, also known as the "city position." [Figure 3] FIG. 2 is a side view of the protective helmet of FIG. 1 with the shield in the "fully open" position. [Figure 4] 2 is a simplified side view of the protective helmet of FIG. 1, showing the mutual arrangement between the shield and the guide portion of the helmet in a simplified manner; FIG. [Figure 5] FIG. 2 is a view similar to FIG. 1, but showing the shield removed from the helmet. [Figure 6] FIG. 1 is a perspective view of the shield of the helmet shield attachment mechanism of the present invention. [Figure 6A] FIG. 7 is an enlarged view of the portion indicated by letter A in FIG. 6. [Figure 7] FIG. 2 is an exploded view of the shield mounting base member of the helmet shield mounting mechanism of the present invention. [Figure 8] FIG. 8 is a side view of the shield mounting base member of FIG. 7. [Figure 9] 9 is a view similar to FIG. 8, but showing the movable base member of the shield mounting base member removed. [Figure 10] FIG. 10 is a view similar to FIG. 9, but with the actuation base member removed. [Figure 11] 1 is a side view of an operating base member of a shield mounting base member according to the present invention. FIG. [Figure 12] FIG. 11 is a rear view of the components of FIG. 10. [Figure 13] FIG. 12 is a rear view of the components of FIG. 11. [Figure 14] 1 is a side view of an assembly formed by the movable base member and locking element of the shield mounting base member of the present invention; [Figure 15]15 is an individual side view of the movable base member of the assembly shown in FIG. 14. [Figure 16] FIG. 15 is an individual side view of a locking element of the assembly shown in FIG. 14. [Figure 17] FIG. 15 is a rear view of FIG. [Figure 18] FIG. 16 is a rear view of FIG. [Figure 19] FIG. 17 is a rear view of FIG. 16. [Figure 20] FIG. 1 is a side view of the shield attachment mechanism of the present invention. [Figure 21] 27A-27C are diagrams illustrating the movement of components of a shield mounting base member relative to one another during movement of the shield illustrated schematically in FIGS. 24-26. [Figure 22] 27A-27C are diagrams illustrating the movement of components of a shield mounting base member relative to one another during movement of the shield illustrated schematically in FIGS. 24-26. [Figure 23] 27A-27C are diagrams illustrating the movement of components of a shield mounting base member relative to one another during movement of the shield illustrated schematically in FIGS. 24-26. [Figure 24] 10A and 10B are diagrams showing the movement of a shield in a simplified manner. [Figure 25] 10A and 10B are diagrams showing the movement of a shield in a simplified manner. [Figure 26] 10A and 10B are diagrams showing the movement of a shield in a simplified manner. [Figure 27] FIG. 21 is a simplified diagram of FIG. [Figure 28] 28 is a view similar to FIG. 27, in which the axis along which the movable base member of the shield mounting base member moves is horizontally disposed. [Figure 29] 10A-10C are diagrams illustrating the rotational translational motion experienced by the shield of the helmet shield attachment mechanism of the present invention, as opposed to simple rotational motion. [Figure 30] 1 is a schematic representation of the movements experienced by the movable base member and actuation member of the helmet shield attachment mechanism of the present invention; [Figure 31]1 is a schematic representation of the movements experienced by the movable base member and actuation member of the helmet shield attachment mechanism of the present invention; [Figure 32] 1 is a schematic representation of the movements experienced by the movable base member and actuation member of the helmet shield attachment mechanism of the present invention; [Figure 33] 1 is a schematic representation of the movements experienced by the movable base member and actuation member of the helmet shield attachment mechanism of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0042] With reference to the accompanying drawings, the present invention is directed to a helmet shield attachment mechanism 10.

[0043] In the following, the term "upper" will refer to areas of the attachment mechanism and its individual components that are relatively far from the ground when in use, while the term "lower" will refer to areas of the attachment mechanism and its individual components that are relatively closer to the ground when in use.

[0044] The term "front" will refer to the area of ​​the attachment mechanism and its individual components that is relatively closer to the user's face, while the term "rear" will refer to the area of ​​the attachment mechanism and its individual components that is relatively further from the user's face.

[0045] The term "inner" will refer to areas of the attachment mechanism and its individual components that are relatively closer to the helmet to which the attachment mechanism is secured, while the term "outer" will refer to areas of the attachment mechanism and its individual components that are relatively farther from the helmet.

[0046] The mounting mechanism 10 includes a shield mounting base member 12 designed to be secured to the shell 2 of the protective helmet 1, and a shield 14 having at least one side 16 secured to the shield mounting base member 12 (see Figures 1-4).

[0047] Shield 14 is a transparent protective screen that, when attached to protective helmet 1 by mechanism 10, is designed to extend over the helmet user's eyes and cover all or part of their face.

[0048] The shield mounting base member 12, in turn, comprises a fixed base member 18 designed to be fixed to the shell 2 of the protective helmet 1, and a movable base member 20 coupled to the fixed base member 18 (see FIGS. 7-8) and to the shield 14 (see FIGS. 6 and 6A). The movable base member 20 is movable relative to the fixed base member 18.

[0049] In accordance with the present invention, the shield mounting base member 12 further comprises an actuation base member 22 (see Figures 7 and 9).

[0050] The actuating base member 22 is pivotally connected to the fixed base member 18 (see FIG. 9 ), and the actuating base member 22 is adapted to rotate along a curved path and abut the movable base member 20 to move the movable base member 20 relative to the fixed base member 18 during rotation of the shield 14. Preferably, an actuating end of the actuating base member 22 abuts the movable base member 20 to move the movable base member 20 relative to the fixed base member 18 during rotation of the shield 14.

[0051] As will become apparent from the following description, the interaction between the actuating base member 22 and the movable base member 20, and the manner in which the shield 14 is connected to the actuating base member 22 and the movable base member 20, allows for a helmet shield attachment mechanism 10 to be obtained that allows for reliable rotational and translational movement of the shield 14 relative to the shell 2 of the helmet 1.

[0052] In particular, by providing the actuating base member 22, the shield 14 can be easily operated by the user to move from a "fully closed" position (see FIG. 1) to a "fully open" position (see FIG. 3) or vice versa, and can also reach a specific "intermediate position" (see FIG. 2) in which the shield 14 is spaced apart from the shell 2 of the helmet 1, the so-called "city position."

[0053] As shown in FIGS. 1-4, the attachment mechanism 10 of the present invention is designed to be applied to the shell 2 of a protective helmet 1.

[0054] In particular, the protective helmet 1 may be provided with two helmet shield attachment mechanisms 10, a first helmet shield attachment mechanism 10 applied to the left portion of the shell 2 and a second helmet shield attachment mechanism 10 applied to the right portion of the shell 2.

[0055] Preferably, the protective helmet 1 is a full-face helmet adapted to be worn by motorcyclists, nevertheless the protective helmet 1 can also be used advantageously by cyclists, skiers or in other sports disciplines where effective protection of the user's head is required.

[0056] As is known in the art, the protective helmet 1 comprises a shell 2, preferably made of a composite or thermoplastic material, as well as a comfort liner designed to contact the user's head when the protective helmet 1 is worn by the user, and an impact absorbing liner interposed between the shell 2 and the comfort liner.

[0057] The comfort liner and impact absorbing liner are located inside the shell 2 and are not visible in the accompanying drawings.

[0058] The shell 2 is provided with a front opening 3, the so-called "eye port", which allows the user to see in front of him (see Figure 5).

[0059] In the fully closed position, the shield 14 covers the front opening 3, protecting the user's face and fitting tightly to the outer shell 2 (see Figure 1), while in the fully open position, the shield 14 does not cover the front opening 3, leaving the user's face unprotected (see Figure 3).

[0060] As will be explained in more detail below, in the fully open position, the shield 14 is also proximate to the shell 2 due to the rotational-translational motion imparted thereto by the attachment mechanism 10. In fact, near the fully open position, the shield 14 experiences a rearward movement, which is indicated in FIG. 3 by the letter B.

[0061] As expected, during the transition from the fully closed position to the fully open position, the shield 14 may also reach an intermediate position, where it is spaced approximately 3 mm from the front opening 3 and no longer tightly contacts the outer shell, allowing a reduced flow of air into the interior of the protective helmet 1 (see FIG. 2). Such an intermediate position is achieved by the possibility that the shield 14 undergoes a forward movement, indicated diagrammatically in FIG. 2 by the letter F.

[0062] As is well known in the art, the shield 14 is preferably made of a hard, transparent material selected from the group including acrylic materials or polycarbonates.

[0063] The shield 14 has an arcuate shape that matches the underlying surface of the shell 2 of the protective helmet 1 .

[0064] As clearly shown in Figures 6 and 6A, the shield 14 preferably comprises a first guide portion 24 adapted to be connected to the movable base member 20 and a second guide portion 26 adapted to be connected to the actuating base member 22.

[0065] The relative positioning of the shield 14 relative to the movable base member 20 and the actuating base member 22 is shown in FIGS.

[0066] As shown diagrammatically in Figures 24-26, during the transition from the fully closed position (Figure 24) to the fully open position (Figure 26), the shield 14 is adapted to rotate about the first guide portion 24.

[0067] Preferably, the first guide portion 24 and the second guide portion 26 are integral with the shield 14 .

[0068] The first and second guide portions 24 , 26 are positioned on opposite sides 16 of the shield 14 and are designed to be coupled to corresponding shield mounting base members 12 positioned on the left and right sides of the shell 2 .

[0069] Preferably, the first guide portion 24 and the second guide portion 26 of the shield 14 are protrusions provided on the inner surface 15 of the shield 14. Therefore, during normal use of the helmet 1, such guide portions 24, 26 are not visible.

[0070] As shown in detail in Figure 6A, the first guide part 24 advantageously consists of a cylindrical protrusion 25. The cylindrical protrusion 25 preferably extends along a longitudinal axis X1 having its origin at a centre C1 (see Figures 1 to 4). Advantageously, said longitudinal axis X1 is perpendicular to the area of ​​the inner surface 15 of the shield 14 in which the first guide part 24 is arranged.

[0071] Preferably, the cylindrical protrusion 25 is hollow.

[0072] The distal end of the first guide part 24, i.e., the end located away from the shield 14, is provided with at least one protrusion 28. Said protrusion 28 extends outwardly from the first guide part 24 substantially perpendicular to the longitudinal axis X1.

[0073] In a preferred embodiment, the first guide portion 24 is provided with at least two protrusions 28 positioned on opposite sides of the cylindrical projection 25 .

[0074] As will be explained below, the function of the protrusions 28 is to allow safe and easy attachment and detachment of the shield 14 to the attachment mechanism 10, and therefore to allow safe and easy attachment and detachment of the shield 14 to the helmet 1.

[0075] The second guide portion 26 is spaced from the first guide portion 24 and positioned toward the center of the shield 14 .

[0076] The second guide part 26 preferably consists of a projecting pin 30 having its origin at the centre C2 and extending along a longitudinal axis X2 (see Figures 1-4).

[0077] Preferably, the protruding pins 30 extend perpendicular to the area of ​​the inner surface 15 of the shield 14 in which the pins are located.

[0078] Preferably, center C2 is spaced a distance SR from center C1 (see Figures 4 and 24-26). Such distance SR may vary between 20-60 mm depending on the shape of shield 14.

[0079] As shown in FIG. 6A, in a preferred embodiment, the protruding pin 30 is provided with a support member 32 at the end near the inner surface 15 of the shield 14 .

[0080] The support member 32 has dimensions greater than the dimensions of the ejector pin 30. The support member 32 extends along a transverse axis Y that is generally parallel to the inner surface 15 of the shield 14 and perpendicular to the longitudinal axis X2 of the ejector pin 30 (see FIG. 4).

[0081] Advantageously, the side surface of the support member 32 is provided with at least one recess 33 (see Figures 4 and 6A).

[0082] As will be explained below, the function of the protruding pin 30 is to allow coupling between the shield 14 and the actuating base member 22, while the function of the support member 32 designed to engage with the movable base member 20 is to improve guidance of the shield 14 during rotation around the first guide portion 24 of the movable base member 20.

[0083] 7 and 10, the fixed base member 18 of the shield mounting base member 12 preferably has a plate-like base structure 19 bounded by a protruding peripheral boundary 34. The boundary 34 protrudes from the outer surface of the base structure 19.

[0084] The fixed base member 18 is preferably designed to be releasably fixed to the shell 2 of the helmet 1 by means of releasable fastening means 36A, 36B, 36C.

[0085] Advantageously, the fixing means 36A, 36B, 36C are adapted to be inserted into corresponding through holes 38A, 38B, 38C provided in the plate-like base structure 19 and fixed in corresponding fixing seats (not shown in the accompanying drawings) arranged on the shell 2.

[0086] Referring to FIG. 9, the fixed base member 18 may include a first guide portion 40 .

[0087] First guide portion 40 is preferably a recess formed in fixed base member 18. As shown in Figure 9, first guide portion 40 may have an elongated shape with its long axis extending along axis T, which indicates the direction of movement of movable base member 20. In fact, as will be explained in more detail below, during movement of shield 14, movable base member 20 moves back and forth along axis T.

[0088] Preferably, the first guide part 40 is bounded by two substantially straight surfaces 41A extending parallel to the axis T. These straight surfaces 41A may be at least partially closed by a front curved surface 41B and a rear curved surface 41C.

[0089] Advantageously, the front curved surface 41B and the rear curved surface 41C have the same radius.

[0090] In a preferred embodiment, the peripheral profile of the first guide portion 40 is provided with one or more openings, not visible in the following figures, which function to facilitate coupling of the movable base member 20 to the fixed base member 18.

[0091] Furthermore, the first guide portion 40 may be delimited by a peripheral edge. Such edge may be provided with retaining teeth, which function in part to ensure a firm connection between the movable base member 20 and the fixed base member 18.

[0092] Preferably, in the first guide part 40, a center C4 can be identified which is on the axis T and equidistant from the front curved surface 41B.

[0093] Similarly, in the first guide part 40, a center C5 can be identified that is on the axis T and equidistant from the rear curved surface 41C.

[0094] The fixed base member 18 may include a second guide portion 42. The second guide portion 42 may be a curved slot centered on a center C3 and having a radius R (see FIGS. 9 and 10).

[0095] 27 and 28, when shield 14 is mounted to shield-mounting base member 12, center C3 is spaced from center C1 by a distance x measured along a line parallel to axis T. Additionally, center C3 is spaced from axis T by a distance y measured along a line perpendicular to axis T.

[0096] The fixed base member 18 may further include first fastening means 44, preferably located on the top and bottom of the fixed base member 18 (see Figures 5 and 9).

[0097] Advantageously, the first fixing means 44 comprises at least one elongated guide track 45 oriented along a direction T1, T2 parallel to the axis T representing the direction of movement. Preferably, the first fixing means 44 comprises a pair of elongated guide tracks 45 spaced apart from one another and oriented along the axis T (see Figure 10).

[0098] Additionally, the fixed base member 18 may include a second fastening means 46 positioned at the front of the fixed base member 18 (see Figures 5 and 9).

[0099] Preferably, the second fixing means 46 comprises a single elongated guide track 47 oriented along a direction parallel to the axes T1 and T (see Figures 9 and 10).

[0100] Advantageously, like the first guide part 40, the second fixing means 46 may be provided with retaining teeth whose function is to ensure a firm connection between the mobile base member 20 and the fixed base member 18.

[0101] As will be explained below, first and second securing means 44, 46 allow for a movable connection between fixed base member 18 and movable base member 20.

[0102] Furthermore, the fixed base member 18 is provided with coupling means 48 for pivotally connecting the actuating base member 22 to the fixed base member 18 (see Figures 7 and 10).

[0103] The connecting means 48 may consist of a protruding pin 49 centered on the center C3 (see Figures 7 and 10).

[0104] The movable base member 20, like the fixed base member 18, preferably has a plate-like base structure 50 (see FIGS. 7 and 15).

[0105] As shown in FIG. 8, the movable base member 20 has a perimeter profile 51 designed to remain within the protruding boundary 34 of the fixed base member 18 when the movable base member 20 and the fixed base member 18 are coupled together.

[0106] The movable base member 20 preferably includes first guide seats 52 located on the top and bottom of the movable base member 20 (see Figures 7, 14-15, 17-18).

[0107] The first guide seat 52 is designed to slidably engage with the first fastening means 44 of the fixed base member 18 .

[0108] Advantageously, the first guide seats 52 may consist of through openings, each having an upper edge 54A and a lower edge 54B (see Figures 14-15).

[0109] The upper and lower edges 54A, 54B of each opening 52 are designed to slidably engage the elongated guide track 45 of the first fixing means 44, allowing translational movement of the movable base member 20 relative to the fixed base member 18 along an axis T representing the direction of movement.

[0110] As shown in FIG. 7, the rear wall of the opening 52 in the lower part of the movable base member 20 may be provided with a protrusion 55 designed to engage a repulsion coil 59, such as the repulsion coil 59 interposed between the movable base member 20 and the front edge of the fixed base member 18.

[0111] The movable base member 20 may further comprise a second guide seat 56 provided at the front upper part of the surrounding profile 51 (see Figures 14-15 and 17-18).

[0112] Preferably, such second guide seat 56 consists of at least one recess 57 in the surrounding profile 51 .

[0113] The second guide seat 56 is designed to engage with the second fastening means 46 of the fixed base member 18. In particular, the recess 57 is adapted to slidably engage with the elongated guide track 47.

[0114] The second guide seat 56 cooperates with the first guide seat 52 in guiding the translational movement of the movable base member 20 relative to the fixed base member 18 along the axis T.

[0115] Preferably, the movable base member 20 also includes a coupling portion 58 for coupling the movable base member 20 to the first guide portion 24 of the shield 14 .

[0116] Advantageously, the connecting portion 58 consists of a recess provided in the mobile base member 20. The profile of the connecting portion 58 is designed to match the outer profile of the first guide portion 24.

[0117] In particular, the coupling portion 58 has a circular profile suitable to match the outer profile of the cylindrical protrusion 25 of the shield 14, allowing rotation of the shield 14 when the cylindrical protrusion 25 of the shield 14 is inserted into the coupling portion 58. In particular, the first guide portion 24 of the shield 14 is designed to rotate about a center C8 defined in the coupling portion 58 of the movable base member 20 (see Figures 14-15).

[0118] The connecting portion 58 has an upper edge 60 provided with a retaining means 62 (see FIG. 7). The retaining means 62, which preferably consists of an undercut provided in the upper edge 60, is adapted to engage with the protrusion 28 of the first guide portion 24 and ensures that unintentional removal of the shield 14 from the movable base member 20 cannot occur.

[0119] As shown in Figures 7 and 15, the upper edge 60 of the connecting portion 58 may also have a slit 64 that is designed to be selectively closed by a first stop member 66 provided on a separate locking element 68, as described below.

[0120] The inner surface of the connecting portion 58 can protrude from the inner surface of the movable base member 20 , abut against the fixed base member 18 , and be slidably received within the first guide portion 40 .

[0121] Preferably, the inner surface of the coupling portion 58 has a circular profile with a radius corresponding to the radius of the front curved surface 41B and the rear curved surface 41C of the first guide portion 40.

[0122] As a result, the mutual arrangement of coupling portion 58 of movable base member 20 and first guide portion 40 of fixed base member 18 may cause front curved surface 41B and rear curved surface 41C to function as stop limits for the sliding movement of movable base member 20 along axis T relative to fixed base member 18. Furthermore, the extension of straight surface 41A of first guide portion 40 may define the maximum distance along axis T that may be traveled by movable base member 20 relative to fixed base member 18.

[0123] 14-15, for example, the movable base member 20 may be provided with a guide track 70. The guide track 70 comprises a groove 71 having a curved profile. The curved groove 71 preferably extends along a portion of a circumference centered on the center C8 of the coupling portion 58 and having a radius SR corresponding to the distance between the center C1 of the first guide portion 24 and the center C2 of the second guide portion 26 of the shield 14.

[0124] As a result, the center C8 of the curved groove 71 coincides with the center C1 of the first guide portion 24 when the shield 14 is coupled to the movable base member 20 (see FIG. 20).

[0125] Preferably, the guide track 70 has a width corresponding to the width of the support member 32. Furthermore, the inner surface of the groove 71 of the guide track is provided with a recess 72 (see Figures 14-15) corresponding to the recess 33 of the support member 32, allowing better guiding of the support member 32 within the curved groove 71 of the guide track 70.

[0126] In particular, the engagement of the inner surface of groove 71 with recess 33 of support member 32 advantageously allows shield 14 to remain parallel to movable base member 20, and thus fixed base member 18, as shield 14 moves up and down.

[0127] Additionally, the interaction of the recesses 72 of the curved grooves 71 with the support members 32 allows the shield 14 to be easily stopped at various intermediate positions between the fully closed and fully open positions.

[0128] Preferably, guide track 70 has a height corresponding to the height of second guide portion 26 of shield 14. In this manner, when shield 14 is coupled to movable base member 20, inner surface 15 of shield 14 is in close proximity to the outer surface of guide track 70.

[0129] Advantageously, the profile of the guide track 70 is open. Preferably, the profile of the guide track 70 is open at its upper end. Advantageously, the profile of the guide track 70 is provided with a slit 73 at its upper end, which slit 73 is designed to be selectively closed by a second stop member 97 provided on the locking element 68, as will be explained below (see Figures 14-16).

[0130] Further, referring to Figures 7, 8 and 14, the movable base member 20 may also be provided with a first release guide 74 provided on the upper part of the movable base member 20 and a second release guide 76 provided on the lower part of the movable base member 20.

[0131] Preferably, the first release guide 74 is positioned near the upper end of the guide track 70. The second release guide 76 may be positioned near the lower end of the guide track 70.

[0132] The first and second release guides 74, 76 consist of protruding elements having protruding distal ends.

[0133] As will be explained in more detail below, such release guides 74, 76 are designed to hold a further element of the helmet shield attachment mechanism 12, the locking element 68, in place.

[0134] 7 and 9, the shield mounting mechanism 12 also includes an actuating base member 22. Preferably, the actuating base member 22 is a separate member interposed between the fixed base member 18 and the movable base member 20.

[0135] Advantageously, as shown in detail in Figures 11 and 13, the actuating base member 22 may be a lever or rod having a first end 77 designed to be pivotally connected to the fixed base member 18 and a second end 81 designed to be connected to the second guide part 26 of the shield 14.

[0136] Preferably, the actuating base member 22 is pivotally connected to the fixed base member 18 at a coupling means 48 so as to be able to rotate about a center C3 (see Figure 9).

[0137] In particular, the actuation base member 22 may have a first through hole 78 at a first end 77 that is designed to be engaged by the protruding pin 49 .

[0138] The actuation base member 22 may be pivotally connected to the protruding pin 49 by an internally threaded sleeve nut 79 into which a corresponding bolt 80 may be threaded after engaging the pin 49 with a hole 78 (see FIG. 7).

[0139] The sleeve bolt 80 secures the operating base member 22 to the fixed base member 18 and allows the operating base member 22 to rotate about a center C3.

[0140] Preferably, the operating base member 22 has a second end 81 opposite the first end 77 and provided with a connecting means 82 by which the operating base member 22 can be removably connected to the second guide portion 26 of the shield 14.

[0141] Preferably, the coupling means 82 is engaged with the second guide part 26 of the shield 14 via a groove 71 provided in the guide track 70. In particular, the coupling means 82 comprises a through hole 84 designed to be engaged by the protruding pin 30 of the second guide part 26. In fact, the through hole 84 is accessible via the groove 71 of the guide track 70 even when the actuating base member 22 is interposed between the fixed base member 18 and the movable base member 20.

[0142] Preferably, the second end 81 is also provided with a shoe 86 designed to slidably engage the inner portion of the guide track 70 provided on the movable base member 20 when the movable base member 20 is coupled to the fixed base member 18.

[0143] In particular, during rotation of the actuation base member 22 , the shoe 86 can slide along the outer surface profile of the inner portion of the guide track 70 .

[0144] Preferably, the shoe 86 partially surrounds the coupling means 82. In a preferred embodiment, the shoe 86 comprises a wall that protrudes from the outer surface of the actuation base member 22.

[0145] The function of the shoe 86 is to keep the actuating base member 22 connected to the movable base member 20 once the shield 14 has been removed from the helmet shield attachment mechanism 10 .

[0146] 9, the second end 81 of the actuating base member 22 is designed to move along a curved profile having a radius R. In this manner, the second end 81 is designed to follow a curved surface corresponding to the second guide portion 42 of the fixed base member 18.

[0147] Advantageously, in a further embodiment, the shoe 86 may also protrude from the inner surface of the operating base member 22 when the operating base member 22 is coupled to the fixed base member 18 and may slidably engage with the second guide portion 42 of the fixed base member 18.

[0148] As expected, the helmet shield attachment mechanism 12 of the present invention may also include a locking element 68. In particular, the locking element 68 is designed to interact with the movable base member 20.

[0149] The locking element 68 may be an operating lever designed to be pivotally connected to the movable base member 20 .

[0150] Preferably, the locking element 68 may be pivotally fixed to the movable base member 20 by removable fixing means, for example a screw, designed to engage in a corresponding seat provided on the movable base member 20.

[0151] Alternatively, the locking element 68 may be provided at its intermediate portion with a protrusion 88 extending from the inner surface of the locking element 68 and designed to be inserted into a corresponding seat 90 located in the movable base member 20. Preferably, the protrusion 88 is a retaining tooth.

[0152] The locking element 68 has a first engagement pawl 92 located on an upper portion of the locking element 68 and a second engagement pawl 94 located on a lower portion of the locking element 68 (see FIG. 7).

[0153] Additionally, the locking element 68 may have a third engagement pawl 93 provided at the rear of the locking element 68 (see FIGS. 16 and 19).

[0154] The first engagement claw 92 and the second engagement claw 94 are designed to slidably engage with the first release guide 74 and the second release guide 76 of the movable base member 20, respectively, so that the locking element 68 can remain fixed to the movable base member 20 during normal use.

[0155] Similarly, the third engagement pawl 93 is designed to slidably engage with a corresponding release guide 75 provided on the movable base member 20 (see FIG. 15).

[0156] Furthermore, as expected, the locking element 68 includes a first stop member 66 provided on the rear surface of the locking element and a second stop member 97 provided on the front surface of the locking element (see Figures 14 and 16).

[0157] The first stop member 66 is designed to selectively close a slit 64 provided in the upper edge 60 of the connecting portion 58, and the second stop member 97 is designed to selectively close a slit 73 provided in the upper end of the guide track 70.

[0158] The locking element 68 can rotate about an axis passing through the projection 88 or through a seat to which the fastening means connecting the element 68 to the movable base member 20 is fixed.

[0159] Such protrusion 88 or seat acts as a fulcrum about center C6 (see FIG. 8). Locking element 68 is movable against a force exerted by a repulsion coil 96, partially visible in FIG. 8, which is interposed between locking element 68 and abutment surfaces provided on movable base member 20.

[0160] In particular, by rotating about its center of rotation C6, the locking element 68 can move from a first position in which the first stop member 66 closes the slit 64 and the second stop member 97 closes the slit 73 to a second position in which the first stop member 66 and the second stop member 97 are spaced apart from the slit 64 and the slit 73, respectively, and vice versa.

[0161] The locking element 68 is also provided with a grip portion 98 designed to be grasped by the fingers of a user (see Figures 7 and 16).

[0162] Preferably, the fixed base member 18, the movable base member 20, and the actuating base member 22 are made from a polymeric material.

[0163] Advantageously, the locking element 68 may be made of a metallic material.

[0164] It will now be disclosed how the various elements of the helmet shield attachment mechanism 10 can be assembled.

[0165] First, the operating base member 22 is connected to the fixed base member 18 by inserting the protruding pin 49 into the through hole 78 and fastening it with a sleeve nut 79 and a bolt 80 .

[0166] The assembly formed by the fixed base member 18 and the actuating base member 22, shown in Figure 9, is then secured to the shell 2 by inserting the securing means 36A, 36B, 36C into the corresponding through holes 38A, 38B, 38C.

[0167] In the next step, the locking element 68 is coupled to the movable base member 20 by a screw or by inserting the retaining teeth 88 into the seats 90 and compressing the repulsion coils 96 positioned between the locking element 68 and the movable base member 20.

[0168] After coupling, the locking element 68 is rotated around the center C6, and the first engagement claw 92 and the second engagement claw 94 are slidably inserted into the corresponding first release means 74 and second release means 76 of the movable base member 20.

[0169] Following such rotation of the locking element 68 assisted by the force of the repulsion coil 96, the first stop member 66 provided on the rear surface of the locking element 68 moves closer to the connecting portion 58 and closes the slit 64 provided in the upper edge 60 of the connecting portion 58.

[0170] Similarly, following rotation of the locking element 68 , a second stop member 97 on the front face of the locking element 68 moves closer to the guide track 70 and closes the slit 73 .

[0171] In this way, the contours of the upper edge 60 of the coupling part 58 and the guide track 70 are completed. Such an assembly is shown in Figures 14 and 17. The mobile base member 20, provided with the locking element 68, is then coupled to the assembly formed by the fixed base member 18 and the actuating base member 22 by engagement of the first and second guide seats 52, 56 with the corresponding first and second fixing means 44, 46. During such coupling operation, a repulsive coil 59 is interposed between the fixed base member 18 and the mobile base member 20, such that the repulsive force exerted by the coil 59 is suitable for pushing the mobile base member 20 backwards when the mobile base member 20 moves forward along the axis T relative to the fixed base member 18.

[0172] The mutual positioning between the first and second guide seats 52, 56 relative to the first and second fixing means 44 and 46 ensures that when the movable base member 20 is coupled to the fixed base member 18, the inner surface, i.e., bottom, of the coupling portion 58 is slidably received in abutting relation within the first guide portion 40 of the fixed base member 18. It also ensures that the inner portion of the guide track 70 engages with a shoe 86 provided on the second end 81 of the actuating base member 22.

[0173] In the next step, the locking element 68 is rotated around its center of rotation C6 against the force exerted by the repulsion coil 96, moving the first stop member 66 away from the slit 64 in the upper edge 60 of the connecting portion 58 and the second stop member 97 away from the slit 73 in the guide track 70.

[0174] In this way, the shield 14 can be coupled to the movable base member 20 and the actuating base member 22. In particular, such coupling is achieved by inserting the first guide portion 24 into the coupling portion 58 of the movable base member 20 and the second guide portion 26 through the slit 73 and into the coupling means 82 provided on the second end 81 of the actuating base member 22.

[0175] Preferably, such coupling step is performed by maintaining the shield 14 in a fully open position relative to the shell 2.

[0176] The locking element 68 is then released and the force exerted by the repulsion coil 96 causes the first stop member 66 to move adjacent to the coupling portion 58, closing the slit 64, and the second stop member 97 to move adjacent to the guide track 70, closing the slit 73.

[0177] In this way, the contours of the upper edge 60 of the connecting portion 58 and the guide track 70 are completed, and disengagement of the shield 14 from the movable base member 20 and the actuating base member 22 is no longer possible. In particular, the protrusion 28 of the first guide portion 24 is firmly fixed within the connecting portion 58, and the second guide portion 26 is firmly fixed within the guide track 70. In particular, with reference to the second guide portion 26, the support member 32 is firmly secured inside the guide track 70.

[0178] In this manner, all components of the actuation mechanism 12 are held together.

[0179] 20-33, the operation of the helmet shield attachment mechanism 10 will now be described.

[0180] In particular, the motion experienced by the shield 14 during movement from the "fully closed" position shown diagrammatically in Figure 24 to the "fully open" position shown diagrammatically in Figure 26 will be disclosed. Movement from the "fully open" position towards the "fully closed" position occurs in the same manner, but in the reverse order.

[0181] As previously mentioned, axis T represents the direction of movement along which movable base member 20 moves back and forth relative to fixed base member 18 .

[0182] Center C7 generally represents the center of shoe 86 of actuation base member 22. When shield 14 is coupled to actuation base member 22, center C7 of actuation base member 22 coincides with center C2 of second coupling portion 26.

[0183] 27 and 28, the angle formed by the longitudinal axis of actuation base member 22 and axis T is designated as angle α.

[0184] The radius R is the distance between the center C3, ie, the center of rotation of the actuation base member 22, and the center C7.

[0185] When the shield 14 is coupled to the movable base member 20, the angle β is designated as the angle formed by the axis T and the radius SR, i.e., the radius connecting the center C8 defined in the movable base member 20 and coinciding with the center C1 of the first guide portion 24 of the shield 14, and the center C7 of the actuating base member 22.

[0186] In the "fully closed" position, it is assumed that center C8, and therefore center C1, coincides with center C5 of first guide portion 40. In this configuration, coupling portion 58 abuts rear curved surface 41C. However, such a condition is not essential for the proper functioning of helmet shield attachment mechanism 10.

[0187] FIG. 28 is similar to FIG. 27, but for clarity, the axis T is placed on the horizontal line.

[0188] When the shield 14 is moved upward from the "fully closed" position of FIG. 24, the first guide portion 24 of the shield 14, which is positioned inside the connecting portion 58, begins to rotate around the center C1 and therefore around the center C8 (see FIG. 25).

[0189] Such rotation of the first guide portion 24 also causes a corresponding rotation of the second guide portion 26, which is engaged with the inner center C7 of the coupling means 82 of the actuating base member 22. Such engagement is achieved via the guide track 70 of the movable base member 20.

[0190] Rotation of the second guide portion 26 results in rotation of the operating base member 22 about the center C3.

[0191] Due to the offset position between centers C8 and C3, and the difference between radius R connecting centers C3 and C7 and radius SR connecting centers C8 and C7 and defining the curve along which guide track 70 extends (see Figures 27 and 28), second guide part 26 causes shoe 86 to rotate, and shoe 86 exerts a forward force on guide track 70 of movable base member 20 during its movement.

[0192] Because the movable base member 20 is movable relative to the fixed base member 18, such forward force results in forward sliding of the movable base member 20 along axis T relative to the fixed base member 18.

[0193] Link 58 begins to move away from rear curved surface 41C, so center C5 no longer coincides with centers C1 and C8.

[0194] Following such forward sliding movement, the initial distance between centres C8 (and C1) and C3 decreases, as shown diagrammatically in Figures 31 and 32, and it can be seen how the second guide part 26 of the shield moves along a curved path gradually away from centre C5.

[0195] This forward movement consequently causes the shield to undergo a forward translation, bringing it to an intermediate position, as shown in FIG. 2, where it is spaced apart from the shell.

[0196] As the shield continues to rotate about first guide portion 24, second guide portion 26, in turn, continues to rotate and translate about center C3. Second guide portion 26 is still engaged within guide track 70, and shoe 86 continues to exert a forward force on movable base member 20, which moves forward along axis T.

[0197] In fact, as shown schematically in Figures 31-32, the second guide portion 26 of the shield 14 still moves along the curved path defined by the guide track 70, resulting in an increase in the distance between the centers C5 and C7.

[0198] The combination of the rotation of the second guide part 26 of the shield 14 about the center C3 and the rotation of the first guide part 24 about the center C8 results in a rotational translation of the shield 14 relative to the shell of the helmet.

[0199] The difference between such rotational translational motion and simple rotational motion is shown diagrammatically in FIG. 29, where the rotational translational trajectory followed by the shield 14 of the present invention is indicated by the letter RT, while the trajectory that a simply rotatable shield would follow is indicated by the letter R.

[0200] The relative positioning of fixed base member 18, operating base member 22, and movable base member 20 continues the forward movement of movable base member 20 until the distance between centers C8 and C3 reaches a minimum value.

[0201] In such a configuration (shown diagrammatically in FIG. 32), it is envisioned that the inner surface of the connecting portion 58 abuts the front curved surface 41B of the first guide portion 40 of the fixed base member 18, with the center C8 coinciding with the center C4. However, such a correlation between the connecting portion 58 and the front curved surface 41B is not required for the correct functioning of the helmet shield attachment mechanism 10.

[0202] The difference between the maximum and minimum distances between the centers C8 and C3 can vary in the range of about 3 mm depending on the shape of the actuating and movable members. Naturally, such values ​​can be changed as needed.

[0203] Therefore, the distance moved by the movable base member corresponds to the distance between the center C4 and the center C5 of the first guide part 40.

[0204] Furthermore, since the distance between centers C8 and C3 depends on angles α and β, which are related to each other by a trigonometric function, the change in the distance between centers C8 and C3 is not linear and is greater at the beginning and end of the shield rotation.

[0205] As the shield 14 continues to rotate upward around the first guide portion 24, the distance between the centers C8 and C3 tends to increase, causing the movable base member 20 to be pushed backward by the operating base member 22, particularly the shoe 86.

[0206] Such rearward movement, indicated diagrammatically by the letter B in FIG. 26, allows the shield 14 to be positioned closer to the shell 2 of the helmet 1 when the shield reaches the "fully open" position.

[0207] In this position, it is also possible to release the shield from the movable base member 20 by acting on the locking element 68 .

[0208] In practice, the user can rotate the locking element 68 around its center C6 by acting on the grip portion 98, so that the first stop member 66 moves away from the slit 64 of the connecting portion 58, keeping the upper edge 60 of the connecting portion 58 open, and the second stop member 97 moves away from the guide track 70, keeping the slit 73 open.

[0209] Through such opening, the protrusion 28 is no longer held by the retaining means 62 and the second guide part 26, in particular the protruding pin 30 and the support member 32, are no longer blocked within the guide track 70, allowing the user to remove the shield 14 from the movable base member 20.

[0210] It is now clear how the present invention makes it possible to achieve the desired objectives.

[0211] In fact, by providing a pivoting actuating member separate from the fixed base member and the movable base member, the helmet shield attachment mechanism can be easily and quickly operated.

[0212] Furthermore, the provision of an actuating base member allows for a simplified construction of the helmet shield attachment mechanism, while at the same time providing a reliable structure capable of guiding the movement of the shield in a safe and accurate manner.

[0213] Additionally, the provision of separate actuating members allows for reduced contact stresses between the fixed and movable base members, reducing wear on these components.

[0214] Finally, the placement of the actuation base member does not affect the dimensions of the attachment mechanism or the dimensions of the helmet.

[0215] With respect to the above-described embodiments of the helmet shield attachment mechanism and protective helmet, those skilled in the art may change and / or replace the described elements with equivalent elements to meet their particular requirements, thereby without departing from the scope of the appended claims.

Claims

1. A helmet shield attachment mechanism (10) comprising a shield attachment base member (12) designed to be secured to a shell (2) of a protective helmet (1), and a shield (14) having at least one side (16) secured to the shield attachment base member (12), the shield attachment base member (12) comprising a fixed base member (18) designed to be secured to the shell (2) of the protective helmet (1), and a movable base member (19) coupled to the fixed base member (18) and the shield (14). and a movable base member (20), the movable base member (20) being movable relative to the fixed base member (18), the shield mounting base member (12) further comprising an actuating base member (22) pivotally connected to the fixed base member (18), the actuating base member (22) adapted to rotate along a curved path and abut against the movable base member (20), thereby moving the movable base member (20) relative to the fixed base member (18) during rotation of the shield (14).

2. 2. The helmet shield attachment mechanism (10) of claim 1, wherein the actuating base member (22) is a separate member interposed between the fixed base member (18) and the movable base member (20).

3. 3. A helmet shield attachment mechanism (10) according to claim 1 or 2, wherein the shield (14) comprises a first guide portion (24) connected to the movable base member (20) and a second guide portion (26) connected to the actuating base member (22).

4. 4. The helmet shield attachment mechanism (10) according to claim 1, wherein the actuating base member (22) is a lever having a first end (77) pivotally connected to the fixed base member (18) and a second end (81) connected to a second guide portion (26) of the shield (14).

5. 5. The helmet shield attachment mechanism (10) of claim 4, wherein the second end (81) of the operating base member (22) is provided with a shoe (86) that slidably engages an inner portion of a guide track (70) provided on the movable base member (20).

6. 5. The helmet shield attachment mechanism (10) of claim 4, wherein the second end (81) of the operating base member (22) is provided with a connecting means (82) that engages with the second guide portion (26) of the shield (14) via a groove (71) provided in a guide track (70).

7. 5. The helmet shield attachment mechanism (10) of claim 4, wherein the second end (81) of the actuating base member (22) moves along a curved profile having a radius (R) and a center (C3), the center (C3) being centered on a connecting means (48) by which the actuating base member (22) is pivotally connected to the fixed base member (18).

8. 8. The helmet shield attachment mechanism (10) according to claim 1, wherein the groove (71) of the guide track (70) has a curved profile with a radius (SR) corresponding to the distance between the first guide portion (24) and the second guide portion (26) of the shield (14), and a center that coincides with the center (C1) of the first guide portion (24) of the shield (14) when the shield (14) is coupled to the movable base member (20).

9. 9. A helmet shield attachment mechanism (10) according to any one of claims 1 to 8, wherein the fixed base member (18) comprises first fastening means (44) located on the upper and lower portions of the fixed base member (18).

10. 10. A helmet shield attachment mechanism (10) according to any one of claims 1 to 9, characterized in that the fixed base member (18) comprises a second fastening means (46) positioned at a front portion of the fixed base member (18).

11. 11. A helmet shield attachment mechanism (10) according to any one of claims 1 to 10, characterized in that each of the first fastening means (44) and each of the second fastening means (46) comprises at least one elongated track (45, 47) oriented along an axis (T) representing a direction of movement of the movable base member (20) relative to the fixed base member (18).

12. 12. The helmet shield attachment mechanism of claim 11, wherein the movable base member includes first guide seats located at the top and bottom of the movable base member, the first guide seats slidably engaging first fastening means of the fixed base member to thereby permit translational movement of the movable base member relative to the fixed base member along axis T.

13. 13. The helmet shield attachment mechanism (10) according to any one of claims 1 to 12, wherein the movable base member (20) comprises a second guide seat (56) provided at the front upper part of the outer peripheral profile (51) of the movable base member (20), the second guide seat (56) engaging with the second fixing means (46) of the fixed base member (18) and cooperating with the first guide seat (52) in guiding the translational movement of the movable base member (20) relative to the fixed base member (18).

14. 14. The helmet shield attachment mechanism (10) according to any one of claims 1 to 13, wherein the movable base member (20) comprises a connecting portion (58) for connecting the movable base member (20) to the first guide portion (24) of the shield (14), the connecting portion (58) comprising a recess provided in the movable base member (20) and having a profile designed to match the profile of the first guide portion (24).

15. 15. The helmet shield attachment mechanism (10) according to any one of claims 1 to 14, wherein a bottom surface of the connecting portion (58) protrudes from an inner surface of the movable base member (20), abuts against the fixed base member (18), and is slidably received within a first guide portion (40) of the fixed base member (18).

16. 16. The helmet shield attachment mechanism (10) according to claim 15, wherein the first guide portion (40) of the fixed base member (18) has an elongated shape with its longitudinal axis extending along an axis (T), and the first guide portion (40) is bounded by two straight surfaces (41A) extending parallel to the axis (T), the straight surfaces being closed by a front curved surface (41B) and a rear curved surface (41C).

17. 17. A helmet shield attachment mechanism (10) according to any one of claims 1 to 16, characterized in that the first guide portion (24) and the second guide portion (26) of the shield (14) are protrusions provided on an inner surface (15) of the shield (14), the first guide portion (24) consisting of a cylindrical protrusion (25), and the second guide portion (26) consisting of a protruding pin (30) provided with a support member (32) having at least one recess (33), the at least one recess (33) corresponding to a recess (72) provided on the inner surface of a groove (71) of a guide track (70).

18. 18. A protective helmet (1) comprising a shell (2) and two helmet shield attachment mechanisms (10) according to any one of claims 1 to 17, wherein a first helmet shield attachment mechanism (10) is applied to a left portion of the shell (2) and a second helmet shield attachment mechanism (10) is applied to a right portion of the shell (2).

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