Shroud locking mechanism and helmet

Abstract

The shroud locking mechanism assembled to the cap body includes a holding member configured to be displaced between a holding position for holding the shroud and a detachable position for enabling detachment of the shroud in response to an external operation, an elastic pressing member configured to elastically press the holding member toward the holding position at all times, and a limiting member configured to be displaced between a limiting position at which the limiting member limits displacement of the holding member disposed at the holding position and a release position at which the limiting member releases the limitation.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a shield locking mechanism attached to a helmet body and a helmet. BACKGROUND

[0002] A helmet having a detachable mechanism that enables detachment of a shield by operation from the outside is known. The detachable mechanism has a detachable member that shifts between a position that holds the shield and a position that enables detachment of the shield. The detachable member is biased by a biasing member toward the position that holds the shield, and shifts to the position that enables detachment of the shield by receiving an operation force from the outside that overcomes the biasing force (for example, Patent Document 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-339142 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, when a strong impact is imparted to the helmet in the above-described detachable mechanism, an inertial force that overcomes the biasing force acts on the detachable member, and the detachable member undesirably shifts from the position that holds the shield to the position that enables detachment of the shield.

[0008] An object of the present disclosure is to provide a shield locking mechanism and a helmet that can suppress shifting of a holding member for holding a shield due to an impact.

[0009] SOLUTION TO THE PROBLEM

[0010] A shield locking mechanism according to one embodiment of the present disclosure is attached to a helmet body, and includes a holding member configured to shift between a holding position that holds a shield and a detachable position that enables detachment of the shield in response to an external operation, a biasing member configured to bias the holding member toward the holding position at all times, and a restriction member configured to shift between a restriction position that restricts shifting of the holding member disposed at the holding position and a release position that releases the restriction in response to an external operation.

[0011] A helmet according to one embodiment of the present disclosure includes a helmet body, a shield, and the above-described shield locking mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a perspective view showing one embodiment of a shield locking mechanism and a helmet having the shield locking mechanism.

[0013] Figure 2It is shown in Figure 1 The front view of the shield locking mechanism when the shield is in the fully closed position.

[0014] Figure 3 It is shown in Figure 1 The front view of the shield locking mechanism when the shield is in the fully open position.

[0015] Figure 4 yes Figure 1 An exploded perspective view of the protective cover locking mechanism.

[0016] Figure 5 It is shown Figure 1 The diagram illustrates the function of the movable substrate in the locking mechanism of the protective cover.

[0017] Figure 6 It is shown Figure 1 The diagram shows the function of the limiting components in the protective cover locking mechanism.

[0018] Figure 7 It is shown Figure 1 The diagram shows the function of the protective cover locking mechanism in maintaining the movement of the components. Detailed Implementation

[0019] The following is for reference Figures 1-7 One embodiment of the protective cover locking mechanism will be described. Additionally, in Figures 1-7 In the diagram, the front, back, left, right, up, and down directions, as viewed from the helmet wearer's perspective, are shown relative to the helmet and visor locking mechanism.

[0020] [helmet]

[0021] like Figure 1 As shown, the helmet 1 includes a helmet body 2, a visor 3, and a visor locking mechanism 4. The helmet body 2 is mounted on the head of the wearer. The helmet body 2 has a window 2H. The helmet wearer ensures visibility through the window 2H. The visor 3 is light-transmitting; by closing the window 2H through the visor 3, the helmet wearer's visibility is maintained and the helmet wearer's head is protected. The visor 3 is fitted to the left side surface of the helmet body 2 by means of the visor locking mechanism 4, which clamps between the visor 3 and the helmet body 2.

[0022] like Figure 2 As shown, the protective cover locking mechanism 4 includes a base plate 10, a retaining member 40, a limiting member 50, a first helical spring 60, and a second helical spring 70 as an example of a spring-loaded member.

[0023] The substrate 10 has a pair of substrates left and right. Each substrate has a curved plate shape along the left side surface of the cap body 2. The pair of substrates is composed of a fixed substrate 20 and a movable substrate 30. The fixed substrate 20 is fixed to the left side surface of the cap body 2. The movable substrate 30 is disposed in a manner to cover a part of the left side of the fixed substrate 20. The movable substrate 30 is connected to the fixed substrate 20 so as to be displaceable in the front-rear direction.

[0024] The fixed substrate 20 and the movable substrate 30 sandwich a part of the holding member 40 (refer to Figure 4 ), a part of the restricting member 50 (refer to Figure 4 ), and a part of the second coil spring 70 (refer to Figure 4 ). The first coil spring 60 extending in the front-rear direction is connected between the fixed substrate 20 and the movable substrate 30. The first coil spring 60 abuts against the fixed substrate 20 and the movable substrate 30, and always presses the movable substrate 30 toward the rear of the helmet wearer.

[0025] [Substrate]

[0026] The substrate 10 has a first engagement hole 31, a second engagement hole 32, and an opening degree regulating portion 21.

[0027] The first engagement hole 31 includes a first attachment / detachment hole 31A and a first guide hole 31B. The first attachment / detachment hole 31A is a substantially square small hole having a through-hole near the upper end edge of the movable substrate 30. The first guide hole 31B is an elongated hole having a through-hole near the upper end edge of the movable substrate 30, and has an arc shape extending toward the rear from the first attachment / detachment hole 31A.

[0028] The shroud 3 has a first engagement tooth 3A protruding toward the fixed substrate 20. The tip portion of the first engagement tooth 3A has a hook shape bent toward the lower side, and has a size that can enter between the fixed substrate 20 and the movable substrate 30 through the first attachment / detachment hole 31A. In addition, the tip portion of the first engagement tooth 3A has a size that can be detached from between the fixed substrate 20 and the movable substrate 30 through the first attachment / detachment hole 31A. The first engagement tooth 3A has a thickness that can slide in the first guide hole 31B along the extension direction of the first guide hole 31B. The thickness of the first engagement tooth 3A corresponds to the amount of the first engagement tooth 3A protruding from the shroud 3 toward the fixed substrate 20 in a manner that the first engagement tooth 3A can slide in the first guide hole 31B. The first guide hole 31B guides the movement of the first engagement tooth 3A toward the extension direction of the first guide hole 31B. The guidance of the first engagement tooth 3A by the first guide hole 31B stabilizes the opening and closing of the shroud 3.

[0029] The second engagement hole 32 includes a second attachment / detachment hole 32A and a second guide hole 32B. The second attachment / detachment hole 32A (refer to Figure 4) is a substantially square hole larger than the first attachment / detachment hole 31A, which penetrates near the upper end edge of the movable base material 30 in front of the first attachment / detachment hole 31A. The second guide hole 32B is a long hole that penetrates the movable base material 30, and has an arc shape that extends from the second attachment / detachment hole 32A toward the lower rear end of the movable base material 30.

[0030] The shroud 3 has the second engagement tooth 3B that protrudes toward the fixed base material 20. The tip end portion of the second engagement tooth 3B has a hook shape that is bent toward the upper rear side, and has a size that can enter between the fixed base material 20 and the movable base material 30 through the second attachment / detachment hole 32A. The tip end portion of the second engagement tooth 3B has a size that can be separated from between the fixed base material 20 and the movable base material 30 through the second attachment / detachment hole 32A. The second engagement tooth 3B has a thickness that can slide along the extension direction of the second guide hole 32B in the second guide hole 32B. The thickness of the second engagement tooth 3B corresponds to the amount of the second engagement tooth 3B that protrudes from the shroud 3 toward the fixed base material 20 in a manner that the second engagement tooth 3B can slide in the second guide hole 32B. The second guide hole 32B guides the movement of the second engagement tooth 3B in the extension direction of the second guide hole 32B. The guidance of the second engagement tooth 3B by the second guide hole 32B stabilizes the opening and closing of the shroud 3.

[0031] The opening degree regulation portion 21 is provided in the portion of the fixed base material 20 that is not covered by the movable base material 30. The opening degree regulation portion 21 has a plurality of stages of engagement portions 21A and an attachment / detachment step portion 21B provided in the fixed base material 20. The plurality of stages of engagement portions 21A have an arc shape that extends from the upper front end of the fixed base material 20 toward the lower rear side. The plurality of stages of engagement portions 21A alternately have a protruding portion that protrudes toward the front and a recessed portion toward the rear along the extension direction of the plurality of stages of engagement portions 21A. The attachment / detachment step portion 21B is a recessed portion toward the upper side, and is connected to the uppermost end of the plurality of stages of engagement portions 21A.

[0032] The shroud 3 has the opening degree adjustment protruding portion 3C that protrudes toward the fixed base material 20. The opening degree adjustment protruding portion 3C has a size that can enter each of the recessed portions provided in the plurality of stages of engagement portions 21A and the attachment / detachment step portion 21B, and has elasticity that can pass through the plurality of protruding portions provided in the plurality of stages of engagement portions 21A one by one in accordance with the opening and closing of the shroud 3. When the first engagement tooth 3A slides in the first guide hole 31B and the second engagement tooth 3B slides in the second guide hole 32B, the opening degree of the shroud 3 is fixed by the opening degree adjustment protruding portion 3C entering any of the recessed portions provided in the plurality of stages of engagement portions 21A. Also, as shown in FIG. 6, the shroud 3 is disposed in the fully open position by the opening degree adjustment protruding portion 3C entering the attachment / detachment step portion 21B provided in the fixed base material 20. Figure 3

[0033] Return Figure 2 ​When the cover 3 is in the fully closed position, the first engaging tooth 3A enters the first guide hole 31B, and the second engaging tooth 3B enters the second guide hole 32B, thereby holding the cover 3 to the substrate 10. Additionally, the opening adjustment protrusion 3C enters the lowest recess of the multi-stage locking portion 21A, thereby fixing the cover 3 in the fully closed position. When the cover 3 is opened from this state, the first engaging tooth 3A moves along the extending direction of the first guide hole 31B, and the second engaging tooth 3B moves along the extending direction of the second guide hole 32B. The opening adjustment protrusion 3C passes over the protrusions of the multi-stage locking portions 21A one by one. Therefore, the opening of the cover 3 is intermittently fixed.

[0034] return Figure 3 When the cover 3 reaches the fully open position, the first engaging tooth 3A moves to the first loading / unloading hole 31A, and the second engaging tooth 3B moves to the second loading / unloading hole 32A. Furthermore, the opening adjustment protrusion 3C moves to the loading / unloading step 21B. The cover 3 can be removed by applying external operation to the retaining member 40 and the limiting member 50.

[0035] [Shield locking mechanism]

[0036] like Figure 4 As shown, the fixing base 20 includes a first mounting portion 22 and a second mounting portion 23. The first mounting portion 22 and the second mounting portion 23 are protrusions that project toward the movable base 30. The first mounting portion 22 and the second mounting portion 23 each have threaded holes 22A and 23A, respectively. The fixing base 20 is fixed to the cap 2 by screws inserted into the threaded holes 22A and 23A and threadedly fastened to the cap 2. The first mounting portion 22 includes a spring seat 22W that protrudes rearward (see reference). Figure 2 , 3 ).

[0037] The movable base plate 30 includes an loading / unloading operation hole 33, a locking rod hole 34, a shaft support hole 35, and a movable hole 36. Furthermore, the movable base plate 30 includes a spring seat 33W formed in front of the loading / unloading operation hole 33 and a spring seat 36W formed behind the movable hole 36. The first assembly portion 22 passes through the movable hole 36. The first helical spring 60 is supported by the spring seat 22W of the fixed base plate 20 located behind the first assembly portion 22 and the spring seat 36W of the movable base plate 30 located behind the movable hole 36.

[0038] like Figure 5 As shown, the first helical spring 60 normally presses the movable substrate 30 rearward relative to the fixed substrate 20. Furthermore, for example, when the movable substrate 30 receives an operating force that overcomes the spring force applied by the first helical spring 60, the movable substrate 30 and the protective cover 3 move forward together.

[0039] For example, when the shield 3 is moved between the fully closed position and the fully open position, the opening degree adjustment protrusion 3C of the shield 3 alternately abuts against the protrusions and recesses provided in the multi-stage locking portion 21A. When the opening degree adjustment protrusion 3C jumps over the adjacent protrusion from the recess, the movable base material 30 receives an external force against the elastic pressure of the first coil spring 60, and the movable base material 30 is displaced to the front. That is, the helmet wearer moves the movable base material 30 by applying an operation force against the elastic pressure of the first coil spring 60 to the shield 3, and moves the shield 3 by the opening degree adjustment protrusion 3C jumping over the adjacent protrusion from the recess. In addition, the helmet wearer fixes the opening degree of the shield 3 by not applying the operation force against the elastic pressure of the first coil spring 60 to the shield 3, and continuing the abutment of the opening degree adjustment protrusion 3C against the recess.

[0040] Returning Figure 4 The holding member 40 is provided with a shield holding tooth 41, a removal lever 42 which is an example of an operation portion, and a link plate portion 43. The shield holding tooth 41 has a plate-like upper end portion in the holding member 40, and has a size that can be rocked in the front-rear direction in the second removal hole 32A. The removal lever 42 has a ring-shaped lower end portion in the holding member 40, and has a size that can be rocked in the front-rear direction in the removal operation hole 33 that penetrates the movable base material 30. The rocking guide surface 33E that demarcates the lower end surface of the removal operation hole 33 is a curved surface that extends in the front-rear direction, and guides the rocking of the removal lever 42 by sliding with the lower end wall of the removal lever 42.

[0041] The link plate portion 43 is a plate-like portion that links the shield holding tooth 41 and the removal lever 42 in the up-down direction, and is housed between the fixed base material 20 and the movable base material 30. A groove that extends in the up-down direction is formed in the side surface of the movable base material 30 that opposes the fixed base material 20, and the link plate portion 43 is housed in the groove. The link plate portion 43 is guided by the groove side surface provided in the movable base material 30, and enables the rocking of the shield holding tooth 41 and the holding member 40.

[0042] When the removal lever 42 is disposed at the rear end of the movable range, the shield holding tooth 41 is disposed at the front end of the movable range. In this way, when the operation force of the external operation is not applied to the holding member 40, the removal lever 42 is disposed at the rear end, and the shield holding tooth 41 is disposed at the front end, and the holding member 40 is disposed at the holding position.

[0043] In contrast, when the operation force from the front toward the rear acts on the holding member 40, the attachment / detachment lever 42 is disposed at the front end of the movable range thereof, and the shield holding tooth 41 is disposed at the rear end of the movable range thereof, and the holding member 40 is disposed at the attachment / detachment position. In this way, when the operation force of the external operation acts on the holding member 40, the holding member 40 is disposed at the attachment / detachment position. The direction in which the holding member 40 is displaced from the holding position is the direction in which the shield holding tooth 41 is displaced, and includes the front-rear direction as a main component.

[0044] The movable base material 30 is provided with a plate-shaped shield clamping tooth 32C extending from the front end of the second attachment / detachment hole 32A toward the inside of the second attachment / detachment hole 32A. When the shield holding tooth 41 is disposed at the front end of the movable range thereof, and the second engagement tooth 3B of the shield 3 is disposed inside the second attachment / detachment hole 32A, the second engagement tooth 3B of the shield 3 is clamped by the shield clamping tooth 32C and the shield holding tooth 41 on both sides, and does not come off from the second attachment / detachment hole 32A. Accordingly, the shield 3 is continuously held by the shield locking mechanism 4. Also, when the shield holding tooth 41 is disposed at the rear end of the movable range thereof, and the second engagement tooth 3B of the shield 3 is disposed inside the second attachment / detachment hole 32A, the second engagement tooth 3B of the shield 3 comes off from the second attachment / detachment hole 32A.

[0045] The second coil spring 70 is supported by a spring seat 33W of the movable base material 30 protruding toward the attachment / detachment operation hole 33, and a spring seat 42W provided to the attachment / detachment lever 42 and protruding in the front direction. The second coil spring 70 always elastically presses the attachment / detachment lever 42 toward the rear end of the movable range thereof. Also, when the attachment / detachment lever 42 receives the above-mentioned operation force overcoming the elastic pressing force applied by the second coil spring 70, the attachment / detachment lever 42 moves toward the front end of the movable range thereof, and the shield holding tooth 41 moves toward the rear end of the movable range thereof.

[0046] The restriction member 50 is provided with a lock lever 51, a restriction protrusion 52, and a shaft portion 53 which is an example of a shaft support portion. The shaft portion 53 has a round plate shape, and is linked to the lock lever 51 and the restriction protrusion 52 in the circumferential surface of the shaft portion 53. The shaft portion 53 is rotatably supported in a shaft support hole 35 formed in the movable base material 30, and rotates in response to an external operation that rotates the lock lever 51, and rotates the restriction protrusion 52 in the same direction as the rotation direction of the lock lever 51.

[0047] The lock lever 51 is a lever extending from the shaft portion 53 toward the front direction, and has a size that can swing in a lock lever hole 34 formed in the movable base material 30. The lock lever 51 swings between a release operation position and a restriction operation position, and in the release operation position, the top end of the lock lever 51 becomes the uppermost position in the movable range thereof, and in the restriction operation position, the top end of the lock lever 51 becomes the lowermost position in the movable range thereof.

[0048] The limiting protrusion 52 is a protrusion extending rearward from the shaft portion 53, and has a size that allows it to rock between the fixed substrate 20 and the movable substrate 30. The limiting protrusion 52 rockes between a limiting action position where the loading / unloading lever 42 at the rear end and the top of the limiting protrusion 52 abut against each other, and a releasing action position where the loading / unloading lever 42 at the rear end and the top of the limiting protrusion 52 do not abut against each other.

[0049] When the locking lever 51 is positioned in the restricted operation position, the restricting protrusion 52 is positioned in the restricted action position, and the restricting member 50 is positioned in the restricted position. Furthermore, the restricting member 50 positioned in the restricted position fixes the loading / unloading lever 42 to its rear end, thereby causing the restricting retaining member 40 to move from the retaining position.

[0050] Conversely, when the locking lever 51 is in the release operation position, the limiting protrusion 52 is in the release action position, and the limiting member 50 is in the release position. Furthermore, the limiting member 50 in the release position allows the loading / unloading lever 42 to move from its rear end, thereby enabling the holding member 40 to be moved from the holding position to the loading / unloading position via external operation. Additionally, the direction in which the limiting member 50 moves from the limiting position is the same as the direction in which the limiting protrusion 52 moves, and it is a rotational direction centered on the shaft 53, with the vertical direction as a major component.

[0051] [effect]

[0052] like Figure 6 As shown, the limiting member 50 shifts between a limiting operation position (solid line) and a releasing operation position (double-dotted line) by applying an operating force to the locking rod 51. When the limiting member 50 is positioned in the limiting operation position, the limiting protrusion 52 abuts against the loading / unloading rod 42, and the limiting member 50 restricts the retaining member 40 from shifting from the retaining position to the loading / unloading position.

[0053] At this point, even if an impact is applied to the helmet 1 from the outside, the retaining member 40 is not easily displaced due to the inertial force acting on it. Furthermore, the direction in which the retaining member 40 displaces from the retaining position is different from the direction in which the limiting member 50 displaces from the limiting position. In other words, the direction in which the retaining member 40 displaces from the retaining position to the loading / unloading position is different from the direction in which the limiting member 50 displaces from the limiting position to the releasing position. Therefore, it can be said that it is difficult to displace both the retaining member 40 and the limiting member 50 using inertial force. Therefore, even if an impact is applied to the helmet 1 from the outside, the helmet visor 3 remains held in place by the helmet visor locking mechanism 4.

[0054] Furthermore, when the limiting member 50 is positioned in the release action position, the limiting protrusion 52 moves away from the loading / unloading rod 42, and the limiting member 50 allows the retaining member 40 to move from the retaining position to the loading / unloading position.

[0055] like Figure 7As shown, when the restriction member 50 is arranged at the release operation position and the shroud 3 is arranged at the fully open position, the first engagement tooth 3A is arranged at the first attachment / detachment hole 31A, and the second engagement tooth 3B is arranged at the second attachment / detachment hole 32A. Also, when the operation force that overcomes the elastic force of the second coil spring 70 is applied to the attachment / detachment lever 42, the holding member 40 is displaced from the holding position to the attachment / detachment position, whereby the shroud 3 can be detached from the shroud locking mechanism 4.

[0056] In addition, when the shroud 3 is attached to the cap body 2, first, the restriction member 50 is arranged at the release operation position. Next, the operation force that overcomes the elastic force of the second coil spring 70 is applied to the attachment / detachment lever 42, and the holding member 40 is displaced from the holding position to the attachment / detachment position, in this state, the first engagement tooth 3A passes through the first attachment / detachment hole 31A, and the second engagement tooth 3B passes through the second attachment / detachment hole 32A, and the opening degree adjustment protrusion 3C is arranged at the attachment / detachment step portion 21B. Accordingly, the shroud 3 is fitted to the shroud locking mechanism 4.

[0057] According to the above-described embodiment, the following effects can be obtained.

[0058] (1) The shroud locking mechanism 4 is provided with the restriction member 50 that is displaced between the restriction position at which the restriction member 50 restricts the holding member 40 from being displaced from the holding position and the release position at which the restriction member 50 releases the restriction. Also, even when the helmet 1 receives a strong impact, the restriction member 50 arranged at the restriction position restricts the displacement of the holding member 40 arranged at the holding position, and thus the displacement of the holding member 40 for holding the shroud 3 due to the impact can be suppressed. Therefore, even when the helmet 1 receives a strong impact, the restriction member 50 arranged at the restriction position restricts the displacement of the holding member 40 from the holding position to the attachment / detachment position, and thus the shroud 3 attached to the shroud locking mechanism 4 can be prevented from being easily detached.

[0059] (2) Since the direction in which the holding member 40 is displaced from the holding position is different from the direction in which the restriction member 50 is displaced from the restriction position, the orientation of the action force for displacing the restriction member 50 from the restriction position to the release position and the orientation of the action force for displacing the holding member 40 from the holding position to the attachment / detachment position are different from each other. Therefore, it is also possible to improve the effectiveness of suppressing displacement of the holding member 40 for holding the shield 3 due to an impact from the outside. In detail, the direction in which the holding member 40 is displaced from the holding position has a large component in the front-rear direction when the front-rear direction and the up-down direction are taken as directional components, that is, the front-rear direction is taken as a main component. The direction in which the restriction member 50 is displaced from the restriction position has a large component in the up-down direction when the front-rear direction and the up-down direction are taken as directional components, that is, the up-down direction is taken as a main component. Therefore, the main component of the action force for displacing the restriction member 50 from the restriction position to the release position and the main component of the action force for displacing the holding member 40 from the holding position to the attachment / detachment position are orthogonal to each other. Thus, it is possible to further improve the effectiveness of suppressing displacement of the holding member 40 for holding the shield 3 due to an impact from the outside. Therefore, when the helmet 1 receives an impact from the outside, displacement of the restriction member 50 from the restriction position and displacement of the holding member 40 from the holding position are less likely to occur at the same time. As a result, the shield 3 is also less likely to be detached from the shield locking mechanism 4.

[0060] (3) A part of the holding member 40 is housed in the substrate 10 by being sandwiched by the fixed base material 20 and the movable base material 30, and is rocked by moving along the curved inner edge formed in the substrate 10. In detail, the attachment / detachment operation hole 33 of the movable base material 30 of the substrate 10 has a rocking guide surface 33E, and the rocking guide surface 33E is brought into sliding contact with the lower end wall of the attachment / detachment lever 42 of the holding member 40, thereby guiding rocking of the attachment / detachment lever 42. Therefore, rocking of the holding member 40 can also be smoothly performed by external operation. In addition, compared with a structure in which the shield locking mechanism 4 has a rotation shaft that rotatably supports the holding member 40 and fixes the holding member 40 to the substrate 10 using the rotation shaft, it is also possible to configure the shield locking mechanism 4 with a smaller number of components.

[0061] (4) A part of the restriction member 50 has a shaft portion 53, the shaft portion 53 is housed in the substrate 10 by being sandwiched by the fixed base material 20 and the movable base material 30, and is rotatably supported by the shaft support hole 35 formed in the substrate 10. Therefore, rotation of the restriction member 50 can also be smoothly performed by external operation. In addition, compared with a structure in which the shield locking mechanism 4 has a rotation shaft that rotatably supports the restriction member 50 and fixes the restriction member 50 to the substrate 10 using the rotation shaft, it is also possible to configure the shield locking mechanism 4 with a smaller number of components.

[0062] (5) The 2nd coil spring 70 inputs an urging force to the attachment / detachment lever 42, and the restriction member 50 abuts against the attachment / detachment lever 42 to restrict displacement of the holding member 40. In addition, the restriction member 50 allows displacement of the attachment / detachment lever 42 by being away from the attachment / detachment lever 42 in the released position of the restriction member 50. That is, since the urging force based on the 2nd coil spring 70 and the restriction force based on the restriction member 50 act on the single attachment / detachment lever 42, the single attachment / detachment lever 42 can have both the machine durability with respect to the urging force and the machine durability with respect to the restriction force. As a result, it is also possible to achieve simplification of the structure in the holding member 40.

[0063] In addition, the above-described embodiment can also be implemented by being changed as follows.

[0064] • The 1st coil spring 60 and the 2nd coil spring 70 are only required to be a structure that applies an urging force to the movable base material 30 or the holding member 40, and even an urging member such as a plate spring, a butterfly spring, or the like can obtain the effects described in (1) to (5) above.

[0065] • The shroud locking mechanism 4 is not limited to the structure in which the 2nd coil spring 70 and the restriction member 50 abut against the attachment / detachment lever 42. The shroud locking mechanism 4 can also be a structure in which the 2nd coil spring 70 and the restriction member 50 input forces at different positions of the holding member 40, and for example, even a structure in which the 2nd coil spring 70 abuts against the attachment / detachment lever 42 and the restriction member 50 abuts against the shroud holding tooth 41 can obtain the effects described in (1) to (5) above.

[0066] • The holding member 40 is only required to be able to displace between the holding position and the attachment / detachment position by receiving an operation force from the outside, and for example, can be a structure in which a shaft is supported by a rotation shaft to receive an operation force from the outside to rotate, or a press switch, an on / off switch, or a screw switch. Even the above-described structure can obtain the effects described in (1) to (5).

[0067] • In the shroud locking mechanism 4, when it is a structure in which the direction in which the holding member 40 is displaced from the holding position and the direction in which the restriction member 50 is displaced from the restriction position are different from each other, the effects described in (2) above can be obtained. In addition, even when it is a structure in which the direction in which the holding member 40 is displaced from the holding position and the direction in which the restriction member 50 is displaced from the restriction position are the same as each other, the displacement of the holding member 40 disposed in the holding position needs to be restricted in advance of the displacement of the holding member 40 from the holding position, and the displacement of the holding member 40 disposed in the holding position can be restricted in correspondence therewith.

Claims

1. A protective cover locking mechanism, assembled on a cap body, the protective cover locking mechanism comprising: The retaining member is configured to accept external operation and shift between a retaining position of the retaining cover and a loading / unloading position in which the cover can be loaded and unloaded; A spring-loaded member configured to normally spring the retaining member toward the retaining position; and A limiting member is configured to shift between a limiting position and a releasing position in response to external operation. In the limiting position, the limiting member restricts the shift of a holding member positioned in the holding position towards the loading / unloading position; in the releasing position, the limiting member releases this restriction. When the cover is in the fully open position and the limiting member is in the released position, the retaining member is positioned in the loading / unloading position by directly accepting external operation, thereby enabling the cover to be removed from the cover locking mechanism.

2. The protective cover locking mechanism according to claim 1, wherein, The direction in which the retaining member moves from the retaining position and the direction in which the limiting member moves from the limiting position are different from each other.

3. The protective cover locking mechanism according to claim 2, wherein, The direction in which the retaining member shifts from the retaining position includes the front-to-back direction as the main component. The direction in which the limiting member shifts from the limiting position includes the vertical direction as the main component.

4. The protective cover locking mechanism according to any one of claims 1 to 3, wherein, It also has a substrate with a pair of substrates. The retaining member is supported on the substrate by being held by the pair of substrates through at least a portion of the retaining member. The substrate has a curved surface configured to guide the rocking motion of the retaining member between the retaining position and the loading / unloading position.

5. The protective cover locking mechanism according to any one of claims 1 to 3, wherein, It also has a substrate with a pair of substrates. The limiting member is supported on the substrate by being held by the pair of substrates through at least a portion of the limiting member. The substrate has a shaft support hole configured to guide the rotation of the limiting member between the limiting position and the releasing position.

6. The protective cover locking mechanism according to any one of claims 1 to 3, wherein, It also has a substrate with a pair of substrates. The retaining member is supported on the substrate by being held by the pair of substrates through at least a portion of the retaining member. The limiting member is supported on the substrate by being held by the pair of substrates through at least a portion of the limiting member. The substrate has a curved surface and a shaft support hole. The curved surface is configured to guide the rocking of the retaining member between the retaining position and the loading / unloading position, and the shaft support hole is configured to guide the rotation of the limiting member between the limiting position and the releasing position.

7. The protective cover locking mechanism according to any one of claims 1 to 6, wherein, The retaining member has an operating part configured to accept external operation. The spring-loaded member is configured to constantly abut against the operating part and input spring force to the operating part. The limiting member is configured to: limit the displacement of the operating part by abutting against the operating part in the limiting position, and allow the displacement of the operating part by moving away from the operating part in the releasing position.

8. A helmet that has the following features: hat body; Shield; and The protective cover locking mechanism according to any one of claims 1 to 7.

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